]>
Commit | Line | Data |
---|---|---|
2bc77e10 | 1 | /* Fold a constant sub-tree into a single node for C-compiler |
22331643 | 2 | Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
04b253e8 | 3 | 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
2bc77e10 | 4 | |
f12b58b3 | 5 | This file is part of GCC. |
2bc77e10 | 6 | |
f12b58b3 | 7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
2bc77e10 | 11 | |
f12b58b3 | 12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
2bc77e10 | 16 | |
17 | You should have received a copy of the GNU General Public License | |
f12b58b3 | 18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
2bc77e10 | 21 | |
4bbea254 | 22 | /*@@ This file should be rewritten to use an arbitrary precision |
2bc77e10 | 23 | @@ representation for "struct tree_int_cst" and "struct tree_real_cst". |
24 | @@ Perhaps the routines could also be used for bc/dc, and made a lib. | |
25 | @@ The routines that translate from the ap rep should | |
26 | @@ warn if precision et. al. is lost. | |
27 | @@ This would also make life easier when this technology is used | |
28 | @@ for cross-compilers. */ | |
29 | ||
30384dcf | 30 | /* The entry points in this file are fold, size_int_wide, size_binop |
6e44befc | 31 | and force_fit_type. |
2bc77e10 | 32 | |
33 | fold takes a tree as argument and returns a simplified tree. | |
34 | ||
35 | size_binop takes a tree code for an arithmetic operation | |
36 | and two operands that are trees, and produces a tree for the | |
37 | result, assuming the type comes from `sizetype'. | |
38 | ||
39 | size_int takes an integer value, and creates a tree constant | |
6e44befc | 40 | with type from `sizetype'. |
41 | ||
4d28c5d1 | 42 | force_fit_type takes a constant, an overflowable flag and prior |
43 | overflow indicators. It forces the value to fit the type and sets | |
44 | TREE_OVERFLOW and TREE_CONSTANT_OVERFLOW as appropriate. */ | |
6e44befc | 45 | |
0dbd1c74 | 46 | #include "config.h" |
5ee8fe30 | 47 | #include "system.h" |
805e22b2 | 48 | #include "coretypes.h" |
49 | #include "tm.h" | |
2bc77e10 | 50 | #include "flags.h" |
51 | #include "tree.h" | |
ef258422 | 52 | #include "real.h" |
0f9685e4 | 53 | #include "rtl.h" |
aed0bd19 | 54 | #include "expr.h" |
7953c610 | 55 | #include "tm_p.h" |
12874aaf | 56 | #include "toplev.h" |
1bfd55c5 | 57 | #include "ggc.h" |
15d769aa | 58 | #include "hashtab.h" |
20325f61 | 59 | #include "langhooks.h" |
fc3df357 | 60 | #include "md5.h" |
2bc77e10 | 61 | |
318a728f | 62 | /* The following constants represent a bit based encoding of GCC's |
63 | comparison operators. This encoding simplifies transformations | |
64 | on relational comparison operators, such as AND and OR. */ | |
65 | enum comparison_code { | |
66 | COMPCODE_FALSE = 0, | |
67 | COMPCODE_LT = 1, | |
68 | COMPCODE_EQ = 2, | |
69 | COMPCODE_LE = 3, | |
70 | COMPCODE_GT = 4, | |
71 | COMPCODE_LTGT = 5, | |
72 | COMPCODE_GE = 6, | |
73 | COMPCODE_ORD = 7, | |
74 | COMPCODE_UNORD = 8, | |
75 | COMPCODE_UNLT = 9, | |
76 | COMPCODE_UNEQ = 10, | |
77 | COMPCODE_UNLE = 11, | |
78 | COMPCODE_UNGT = 12, | |
79 | COMPCODE_NE = 13, | |
80 | COMPCODE_UNGE = 14, | |
81 | COMPCODE_TRUE = 15 | |
82 | }; | |
83 | ||
de1b648b | 84 | static void encode (HOST_WIDE_INT *, unsigned HOST_WIDE_INT, HOST_WIDE_INT); |
85 | static void decode (HOST_WIDE_INT *, unsigned HOST_WIDE_INT *, HOST_WIDE_INT *); | |
bd214d13 | 86 | static bool negate_mathfn_p (enum built_in_function); |
de1b648b | 87 | static bool negate_expr_p (tree); |
88 | static tree negate_expr (tree); | |
89 | static tree split_tree (tree, enum tree_code, tree *, tree *, tree *, int); | |
90 | static tree associate_trees (tree, tree, enum tree_code, tree); | |
de1b648b | 91 | static tree const_binop (enum tree_code, tree, tree, int); |
80db63ef | 92 | static tree build_zero_vector (tree); |
04b253e8 | 93 | static tree fold_convert_const (enum tree_code, tree, tree); |
318a728f | 94 | static enum tree_code invert_tree_comparison (enum tree_code, bool); |
318a728f | 95 | static enum comparison_code comparison_to_compcode (enum tree_code); |
96 | static enum tree_code compcode_to_comparison (enum comparison_code); | |
97 | static tree combine_comparisons (enum tree_code, enum tree_code, | |
98 | enum tree_code, tree, tree, tree); | |
de1b648b | 99 | static int truth_value_p (enum tree_code); |
100 | static int operand_equal_for_comparison_p (tree, tree, tree); | |
101 | static int twoval_comparison_p (tree, tree *, tree *, int *); | |
102 | static tree eval_subst (tree, tree, tree, tree, tree); | |
103 | static tree pedantic_omit_one_operand (tree, tree, tree); | |
104 | static tree distribute_bit_expr (enum tree_code, tree, tree, tree); | |
105 | static tree make_bit_field_ref (tree, tree, int, int, int); | |
106 | static tree optimize_bit_field_compare (enum tree_code, tree, tree, tree); | |
107 | static tree decode_field_reference (tree, HOST_WIDE_INT *, HOST_WIDE_INT *, | |
108 | enum machine_mode *, int *, int *, | |
109 | tree *, tree *); | |
110 | static int all_ones_mask_p (tree, int); | |
111 | static tree sign_bit_p (tree, tree); | |
112 | static int simple_operand_p (tree); | |
113 | static tree range_binop (enum tree_code, tree, tree, int, tree, int); | |
114 | static tree make_range (tree, int *, tree *, tree *); | |
115 | static tree build_range_check (tree, tree, int, tree, tree); | |
116 | static int merge_ranges (int *, tree *, tree *, int, tree, tree, int, tree, | |
117 | tree); | |
118 | static tree fold_range_test (tree); | |
9b1fa4a0 | 119 | static tree fold_cond_expr_with_comparison (tree, tree, tree, tree); |
de1b648b | 120 | static tree unextend (tree, int, int, tree); |
121 | static tree fold_truthop (enum tree_code, tree, tree, tree); | |
122 | static tree optimize_minmax_comparison (tree); | |
123 | static tree extract_muldiv (tree, tree, enum tree_code, tree); | |
124 | static tree extract_muldiv_1 (tree, tree, enum tree_code, tree); | |
de1b648b | 125 | static int multiple_of_p (tree, tree, tree); |
de1b648b | 126 | static tree fold_binary_op_with_conditional_arg (enum tree_code, tree, tree, |
127 | tree, int); | |
128 | static bool fold_real_zero_addition_p (tree, tree, int); | |
129 | static tree fold_mathfn_compare (enum built_in_function, enum tree_code, | |
130 | tree, tree, tree); | |
131 | static tree fold_inf_compare (enum tree_code, tree, tree, tree); | |
270029e0 | 132 | static tree fold_div_compare (enum tree_code, tree, tree, tree); |
bd214d13 | 133 | static bool reorder_operands_p (tree, tree); |
9d77437d | 134 | static tree fold_negate_const (tree, tree); |
c183306c | 135 | static tree fold_not_const (tree, tree); |
ad46984d | 136 | static tree fold_relational_const (enum tree_code, tree, tree, tree); |
c183306c | 137 | static tree fold_relational_hi_lo (enum tree_code *, const tree, |
138 | tree *, tree *); | |
990af12c | 139 | static bool tree_expr_nonzero_p (tree); |
9d77437d | 140 | |
083a2b5e | 141 | /* We know that A1 + B1 = SUM1, using 2's complement arithmetic and ignoring |
142 | overflow. Suppose A, B and SUM have the same respective signs as A1, B1, | |
143 | and SUM1. Then this yields nonzero if overflow occurred during the | |
144 | addition. | |
145 | ||
146 | Overflow occurs if A and B have the same sign, but A and SUM differ in | |
147 | sign. Use `^' to test whether signs differ, and `< 0' to isolate the | |
148 | sign. */ | |
149 | #define OVERFLOW_SUM_SIGN(a, b, sum) ((~((a) ^ (b)) & ((a) ^ (sum))) < 0) | |
2bc77e10 | 150 | \f |
b572011e | 151 | /* To do constant folding on INTEGER_CST nodes requires two-word arithmetic. |
bd5b3bce | 152 | We do that by representing the two-word integer in 4 words, with only |
083a2b5e | 153 | HOST_BITS_PER_WIDE_INT / 2 bits stored in each word, as a positive |
154 | number. The value of the word is LOWPART + HIGHPART * BASE. */ | |
bd5b3bce | 155 | |
156 | #define LOWPART(x) \ | |
083a2b5e | 157 | ((x) & (((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2)) - 1)) |
bd5b3bce | 158 | #define HIGHPART(x) \ |
083a2b5e | 159 | ((unsigned HOST_WIDE_INT) (x) >> HOST_BITS_PER_WIDE_INT / 2) |
160 | #define BASE ((unsigned HOST_WIDE_INT) 1 << HOST_BITS_PER_WIDE_INT / 2) | |
2bc77e10 | 161 | |
bd5b3bce | 162 | /* Unpack a two-word integer into 4 words. |
b572011e | 163 | LOW and HI are the integer, as two `HOST_WIDE_INT' pieces. |
bd5b3bce | 164 | WORDS points to the array of HOST_WIDE_INTs. */ |
2bc77e10 | 165 | |
166 | static void | |
de1b648b | 167 | encode (HOST_WIDE_INT *words, unsigned HOST_WIDE_INT low, HOST_WIDE_INT hi) |
2bc77e10 | 168 | { |
bd5b3bce | 169 | words[0] = LOWPART (low); |
170 | words[1] = HIGHPART (low); | |
171 | words[2] = LOWPART (hi); | |
172 | words[3] = HIGHPART (hi); | |
2bc77e10 | 173 | } |
174 | ||
bd5b3bce | 175 | /* Pack an array of 4 words into a two-word integer. |
176 | WORDS points to the array of words. | |
b572011e | 177 | The integer is stored into *LOW and *HI as two `HOST_WIDE_INT' pieces. */ |
2bc77e10 | 178 | |
179 | static void | |
dc81944a | 180 | decode (HOST_WIDE_INT *words, unsigned HOST_WIDE_INT *low, |
181 | HOST_WIDE_INT *hi) | |
2bc77e10 | 182 | { |
083a2b5e | 183 | *low = words[0] + words[1] * BASE; |
184 | *hi = words[2] + words[3] * BASE; | |
2bc77e10 | 185 | } |
186 | \f | |
4d28c5d1 | 187 | /* T is an INT_CST node. OVERFLOWABLE indicates if we are interested |
188 | in overflow of the value, when >0 we are only interested in signed | |
189 | overflow, for <0 we are interested in any overflow. OVERFLOWED | |
190 | indicates whether overflow has already occurred. CONST_OVERFLOWED | |
191 | indicates whether constant overflow has already occurred. We force | |
192 | T's value to be within range of T's type (by setting to 0 or 1 all | |
193 | the bits outside the type's range). We set TREE_OVERFLOWED if, | |
9ee236f3 | 194 | OVERFLOWED is nonzero, |
4d28c5d1 | 195 | or OVERFLOWABLE is >0 and signed overflow occurs |
196 | or OVERFLOWABLE is <0 and any overflow occurs | |
197 | We set TREE_CONSTANT_OVERFLOWED if, | |
9ee236f3 | 198 | CONST_OVERFLOWED is nonzero |
4d28c5d1 | 199 | or we set TREE_OVERFLOWED. |
200 | We return either the original T, or a copy. */ | |
083a2b5e | 201 | |
4d28c5d1 | 202 | tree |
7c446c95 | 203 | force_fit_type (tree t, int overflowable, |
204 | bool overflowed, bool overflowed_const) | |
2bc77e10 | 205 | { |
a0c2c45b | 206 | unsigned HOST_WIDE_INT low; |
207 | HOST_WIDE_INT high; | |
208 | unsigned int prec; | |
4d28c5d1 | 209 | int sign_extended_type; |
2bc77e10 | 210 | |
fdada98f | 211 | gcc_assert (TREE_CODE (t) == INTEGER_CST); |
0c5713a2 | 212 | |
817e5691 | 213 | low = TREE_INT_CST_LOW (t); |
214 | high = TREE_INT_CST_HIGH (t); | |
d7b6c802 | 215 | |
1bc16cab | 216 | if (POINTER_TYPE_P (TREE_TYPE (t)) |
217 | || TREE_CODE (TREE_TYPE (t)) == OFFSET_TYPE) | |
2bc77e10 | 218 | prec = POINTER_SIZE; |
817e5691 | 219 | else |
220 | prec = TYPE_PRECISION (TREE_TYPE (t)); | |
4d28c5d1 | 221 | /* Size types *are* sign extended. */ |
222 | sign_extended_type = (!TYPE_UNSIGNED (TREE_TYPE (t)) | |
223 | || (TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE | |
224 | && TYPE_IS_SIZETYPE (TREE_TYPE (t)))); | |
2bc77e10 | 225 | |
226 | /* First clear all bits that are beyond the type's precision. */ | |
227 | ||
b572011e | 228 | if (prec == 2 * HOST_BITS_PER_WIDE_INT) |
2bc77e10 | 229 | ; |
b572011e | 230 | else if (prec > HOST_BITS_PER_WIDE_INT) |
4d28c5d1 | 231 | high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT)); |
2bc77e10 | 232 | else |
233 | { | |
4d28c5d1 | 234 | high = 0; |
b572011e | 235 | if (prec < HOST_BITS_PER_WIDE_INT) |
4d28c5d1 | 236 | low &= ~((HOST_WIDE_INT) (-1) << prec); |
237 | } | |
238 | ||
239 | if (!sign_extended_type) | |
240 | /* No sign extension */; | |
241 | else if (prec == 2 * HOST_BITS_PER_WIDE_INT) | |
242 | /* Correct width already. */; | |
243 | else if (prec > HOST_BITS_PER_WIDE_INT) | |
244 | { | |
245 | /* Sign extend top half? */ | |
246 | if (high & ((unsigned HOST_WIDE_INT)1 | |
247 | << (prec - HOST_BITS_PER_WIDE_INT - 1))) | |
248 | high |= (HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT); | |
249 | } | |
250 | else if (prec == HOST_BITS_PER_WIDE_INT) | |
251 | { | |
252 | if ((HOST_WIDE_INT)low < 0) | |
253 | high = -1; | |
254 | } | |
255 | else | |
256 | { | |
257 | /* Sign extend bottom half? */ | |
258 | if (low & ((unsigned HOST_WIDE_INT)1 << (prec - 1))) | |
2bc77e10 | 259 | { |
4d28c5d1 | 260 | high = -1; |
261 | low |= (HOST_WIDE_INT)(-1) << prec; | |
2bc77e10 | 262 | } |
263 | } | |
f55401f0 | 264 | |
4d28c5d1 | 265 | /* If the value changed, return a new node. */ |
266 | if (overflowed || overflowed_const | |
267 | || low != TREE_INT_CST_LOW (t) || high != TREE_INT_CST_HIGH (t)) | |
268 | { | |
7016c612 | 269 | t = build_int_cst_wide (TREE_TYPE (t), low, high); |
0c5713a2 | 270 | |
4d28c5d1 | 271 | if (overflowed |
272 | || overflowable < 0 | |
273 | || (overflowable > 0 && sign_extended_type)) | |
274 | { | |
00b76131 | 275 | t = copy_node (t); |
4d28c5d1 | 276 | TREE_OVERFLOW (t) = 1; |
277 | TREE_CONSTANT_OVERFLOW (t) = 1; | |
278 | } | |
279 | else if (overflowed_const) | |
00b76131 | 280 | { |
281 | t = copy_node (t); | |
282 | TREE_CONSTANT_OVERFLOW (t) = 1; | |
283 | } | |
4d28c5d1 | 284 | } |
0c5713a2 | 285 | |
4d28c5d1 | 286 | return t; |
2bc77e10 | 287 | } |
288 | \f | |
b572011e | 289 | /* Add two doubleword integers with doubleword result. |
290 | Each argument is given as two `HOST_WIDE_INT' pieces. | |
2bc77e10 | 291 | One argument is L1 and H1; the other, L2 and H2. |
bd5b3bce | 292 | The value is stored as two `HOST_WIDE_INT' pieces in *LV and *HV. */ |
2bc77e10 | 293 | |
b9e999f0 | 294 | int |
dc81944a | 295 | add_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1, |
296 | unsigned HOST_WIDE_INT l2, HOST_WIDE_INT h2, | |
297 | unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv) | |
2bc77e10 | 298 | { |
a0c2c45b | 299 | unsigned HOST_WIDE_INT l; |
300 | HOST_WIDE_INT h; | |
2bc77e10 | 301 | |
bd5b3bce | 302 | l = l1 + l2; |
a0c2c45b | 303 | h = h1 + h2 + (l < l1); |
2bc77e10 | 304 | |
bd5b3bce | 305 | *lv = l; |
306 | *hv = h; | |
083a2b5e | 307 | return OVERFLOW_SUM_SIGN (h1, h2, h); |
2bc77e10 | 308 | } |
309 | ||
b572011e | 310 | /* Negate a doubleword integer with doubleword result. |
b9e999f0 | 311 | Return nonzero if the operation overflows, assuming it's signed. |
b572011e | 312 | The argument is given as two `HOST_WIDE_INT' pieces in L1 and H1. |
bd5b3bce | 313 | The value is stored as two `HOST_WIDE_INT' pieces in *LV and *HV. */ |
2bc77e10 | 314 | |
b9e999f0 | 315 | int |
dc81944a | 316 | neg_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1, |
317 | unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv) | |
2bc77e10 | 318 | { |
319 | if (l1 == 0) | |
320 | { | |
321 | *lv = 0; | |
322 | *hv = - h1; | |
f55401f0 | 323 | return (*hv & h1) < 0; |
2bc77e10 | 324 | } |
325 | else | |
326 | { | |
cc049fa3 | 327 | *lv = -l1; |
328 | *hv = ~h1; | |
b9e999f0 | 329 | return 0; |
2bc77e10 | 330 | } |
331 | } | |
332 | \f | |
b572011e | 333 | /* Multiply two doubleword integers with doubleword result. |
b9e999f0 | 334 | Return nonzero if the operation overflows, assuming it's signed. |
b572011e | 335 | Each argument is given as two `HOST_WIDE_INT' pieces. |
2bc77e10 | 336 | One argument is L1 and H1; the other, L2 and H2. |
bd5b3bce | 337 | The value is stored as two `HOST_WIDE_INT' pieces in *LV and *HV. */ |
2bc77e10 | 338 | |
b9e999f0 | 339 | int |
dc81944a | 340 | mul_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1, |
341 | unsigned HOST_WIDE_INT l2, HOST_WIDE_INT h2, | |
342 | unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv) | |
2bc77e10 | 343 | { |
bd5b3bce | 344 | HOST_WIDE_INT arg1[4]; |
345 | HOST_WIDE_INT arg2[4]; | |
346 | HOST_WIDE_INT prod[4 * 2]; | |
19cb6b50 | 347 | unsigned HOST_WIDE_INT carry; |
348 | int i, j, k; | |
a0c2c45b | 349 | unsigned HOST_WIDE_INT toplow, neglow; |
350 | HOST_WIDE_INT tophigh, neghigh; | |
2bc77e10 | 351 | |
2bc77e10 | 352 | encode (arg1, l1, h1); |
353 | encode (arg2, l2, h2); | |
354 | ||
f0af5a88 | 355 | memset (prod, 0, sizeof prod); |
2bc77e10 | 356 | |
bd5b3bce | 357 | for (i = 0; i < 4; i++) |
358 | { | |
359 | carry = 0; | |
360 | for (j = 0; j < 4; j++) | |
361 | { | |
362 | k = i + j; | |
363 | /* This product is <= 0xFFFE0001, the sum <= 0xFFFF0000. */ | |
364 | carry += arg1[i] * arg2[j]; | |
365 | /* Since prod[p] < 0xFFFF, this sum <= 0xFFFFFFFF. */ | |
366 | carry += prod[k]; | |
367 | prod[k] = LOWPART (carry); | |
368 | carry = HIGHPART (carry); | |
369 | } | |
370 | prod[i + 4] = carry; | |
371 | } | |
2bc77e10 | 372 | |
bd5b3bce | 373 | decode (prod, lv, hv); /* This ignores prod[4] through prod[4*2-1] */ |
b9e999f0 | 374 | |
375 | /* Check for overflow by calculating the top half of the answer in full; | |
376 | it should agree with the low half's sign bit. */ | |
cc049fa3 | 377 | decode (prod + 4, &toplow, &tophigh); |
b9e999f0 | 378 | if (h1 < 0) |
379 | { | |
380 | neg_double (l2, h2, &neglow, &neghigh); | |
381 | add_double (neglow, neghigh, toplow, tophigh, &toplow, &tophigh); | |
382 | } | |
383 | if (h2 < 0) | |
384 | { | |
385 | neg_double (l1, h1, &neglow, &neghigh); | |
386 | add_double (neglow, neghigh, toplow, tophigh, &toplow, &tophigh); | |
387 | } | |
388 | return (*hv < 0 ? ~(toplow & tophigh) : toplow | tophigh) != 0; | |
2bc77e10 | 389 | } |
390 | \f | |
b572011e | 391 | /* Shift the doubleword integer in L1, H1 left by COUNT places |
2bc77e10 | 392 | keeping only PREC bits of result. |
393 | Shift right if COUNT is negative. | |
394 | ARITH nonzero specifies arithmetic shifting; otherwise use logical shift. | |
b572011e | 395 | Store the value as two `HOST_WIDE_INT' pieces in *LV and *HV. */ |
2bc77e10 | 396 | |
f55401f0 | 397 | void |
dc81944a | 398 | lshift_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1, |
399 | HOST_WIDE_INT count, unsigned int prec, | |
400 | unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv, int arith) | |
2bc77e10 | 401 | { |
7c5b13dc | 402 | unsigned HOST_WIDE_INT signmask; |
403 | ||
2bc77e10 | 404 | if (count < 0) |
405 | { | |
cc049fa3 | 406 | rshift_double (l1, h1, -count, prec, lv, hv, arith); |
f55401f0 | 407 | return; |
2bc77e10 | 408 | } |
cc049fa3 | 409 | |
0bb60c65 | 410 | if (SHIFT_COUNT_TRUNCATED) |
411 | count %= prec; | |
2bc77e10 | 412 | |
016d117a | 413 | if (count >= 2 * HOST_BITS_PER_WIDE_INT) |
414 | { | |
415 | /* Shifting by the host word size is undefined according to the | |
416 | ANSI standard, so we must handle this as a special case. */ | |
417 | *hv = 0; | |
418 | *lv = 0; | |
419 | } | |
420 | else if (count >= HOST_BITS_PER_WIDE_INT) | |
2bc77e10 | 421 | { |
a0c2c45b | 422 | *hv = l1 << (count - HOST_BITS_PER_WIDE_INT); |
bd5b3bce | 423 | *lv = 0; |
424 | } | |
425 | else | |
426 | { | |
427 | *hv = (((unsigned HOST_WIDE_INT) h1 << count) | |
a0c2c45b | 428 | | (l1 >> (HOST_BITS_PER_WIDE_INT - count - 1) >> 1)); |
429 | *lv = l1 << count; | |
2bc77e10 | 430 | } |
7c5b13dc | 431 | |
432 | /* Sign extend all bits that are beyond the precision. */ | |
433 | ||
434 | signmask = -((prec > HOST_BITS_PER_WIDE_INT | |
f9a532b0 | 435 | ? ((unsigned HOST_WIDE_INT) *hv |
d3371fcd | 436 | >> (prec - HOST_BITS_PER_WIDE_INT - 1)) |
7c5b13dc | 437 | : (*lv >> (prec - 1))) & 1); |
438 | ||
439 | if (prec >= 2 * HOST_BITS_PER_WIDE_INT) | |
440 | ; | |
441 | else if (prec >= HOST_BITS_PER_WIDE_INT) | |
442 | { | |
443 | *hv &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT)); | |
444 | *hv |= signmask << (prec - HOST_BITS_PER_WIDE_INT); | |
445 | } | |
446 | else | |
447 | { | |
448 | *hv = signmask; | |
449 | *lv &= ~((unsigned HOST_WIDE_INT) (-1) << prec); | |
450 | *lv |= signmask << prec; | |
451 | } | |
2bc77e10 | 452 | } |
453 | ||
b572011e | 454 | /* Shift the doubleword integer in L1, H1 right by COUNT places |
2bc77e10 | 455 | keeping only PREC bits of result. COUNT must be positive. |
456 | ARITH nonzero specifies arithmetic shifting; otherwise use logical shift. | |
b572011e | 457 | Store the value as two `HOST_WIDE_INT' pieces in *LV and *HV. */ |
2bc77e10 | 458 | |
459 | void | |
dc81944a | 460 | rshift_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1, |
461 | HOST_WIDE_INT count, unsigned int prec, | |
462 | unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv, | |
de1b648b | 463 | int arith) |
2bc77e10 | 464 | { |
bd5b3bce | 465 | unsigned HOST_WIDE_INT signmask; |
a0c2c45b | 466 | |
bd5b3bce | 467 | signmask = (arith |
468 | ? -((unsigned HOST_WIDE_INT) h1 >> (HOST_BITS_PER_WIDE_INT - 1)) | |
469 | : 0); | |
2bc77e10 | 470 | |
0bb60c65 | 471 | if (SHIFT_COUNT_TRUNCATED) |
472 | count %= prec; | |
2bc77e10 | 473 | |
016d117a | 474 | if (count >= 2 * HOST_BITS_PER_WIDE_INT) |
475 | { | |
476 | /* Shifting by the host word size is undefined according to the | |
477 | ANSI standard, so we must handle this as a special case. */ | |
7c5b13dc | 478 | *hv = 0; |
479 | *lv = 0; | |
016d117a | 480 | } |
481 | else if (count >= HOST_BITS_PER_WIDE_INT) | |
2bc77e10 | 482 | { |
7c5b13dc | 483 | *hv = 0; |
484 | *lv = (unsigned HOST_WIDE_INT) h1 >> (count - HOST_BITS_PER_WIDE_INT); | |
bd5b3bce | 485 | } |
486 | else | |
487 | { | |
7c5b13dc | 488 | *hv = (unsigned HOST_WIDE_INT) h1 >> count; |
a0c2c45b | 489 | *lv = ((l1 >> count) |
5ee8fe30 | 490 | | ((unsigned HOST_WIDE_INT) h1 << (HOST_BITS_PER_WIDE_INT - count - 1) << 1)); |
7c5b13dc | 491 | } |
492 | ||
493 | /* Zero / sign extend all bits that are beyond the precision. */ | |
494 | ||
495 | if (count >= (HOST_WIDE_INT)prec) | |
496 | { | |
497 | *hv = signmask; | |
498 | *lv = signmask; | |
499 | } | |
500 | else if ((prec - count) >= 2 * HOST_BITS_PER_WIDE_INT) | |
501 | ; | |
502 | else if ((prec - count) >= HOST_BITS_PER_WIDE_INT) | |
503 | { | |
504 | *hv &= ~((HOST_WIDE_INT) (-1) << (prec - count - HOST_BITS_PER_WIDE_INT)); | |
505 | *hv |= signmask << (prec - count - HOST_BITS_PER_WIDE_INT); | |
506 | } | |
507 | else | |
508 | { | |
509 | *hv = signmask; | |
510 | *lv &= ~((unsigned HOST_WIDE_INT) (-1) << (prec - count)); | |
511 | *lv |= signmask << (prec - count); | |
2bc77e10 | 512 | } |
2bc77e10 | 513 | } |
514 | \f | |
bd5b3bce | 515 | /* Rotate the doubleword integer in L1, H1 left by COUNT places |
2bc77e10 | 516 | keeping only PREC bits of result. |
517 | Rotate right if COUNT is negative. | |
b572011e | 518 | Store the value as two `HOST_WIDE_INT' pieces in *LV and *HV. */ |
2bc77e10 | 519 | |
520 | void | |
dc81944a | 521 | lrotate_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1, |
522 | HOST_WIDE_INT count, unsigned int prec, | |
523 | unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv) | |
2bc77e10 | 524 | { |
a0c2c45b | 525 | unsigned HOST_WIDE_INT s1l, s2l; |
526 | HOST_WIDE_INT s1h, s2h; | |
2bc77e10 | 527 | |
7a1b56a9 | 528 | count %= prec; |
2bc77e10 | 529 | if (count < 0) |
7a1b56a9 | 530 | count += prec; |
2bc77e10 | 531 | |
7a1b56a9 | 532 | lshift_double (l1, h1, count, prec, &s1l, &s1h, 0); |
533 | rshift_double (l1, h1, prec - count, prec, &s2l, &s2h, 0); | |
534 | *lv = s1l | s2l; | |
535 | *hv = s1h | s2h; | |
2bc77e10 | 536 | } |
537 | ||
b572011e | 538 | /* Rotate the doubleword integer in L1, H1 left by COUNT places |
2bc77e10 | 539 | keeping only PREC bits of result. COUNT must be positive. |
b572011e | 540 | Store the value as two `HOST_WIDE_INT' pieces in *LV and *HV. */ |
2bc77e10 | 541 | |
542 | void | |
dc81944a | 543 | rrotate_double (unsigned HOST_WIDE_INT l1, HOST_WIDE_INT h1, |
544 | HOST_WIDE_INT count, unsigned int prec, | |
545 | unsigned HOST_WIDE_INT *lv, HOST_WIDE_INT *hv) | |
2bc77e10 | 546 | { |
a0c2c45b | 547 | unsigned HOST_WIDE_INT s1l, s2l; |
548 | HOST_WIDE_INT s1h, s2h; | |
2bc77e10 | 549 | |
7a1b56a9 | 550 | count %= prec; |
551 | if (count < 0) | |
552 | count += prec; | |
2bc77e10 | 553 | |
7a1b56a9 | 554 | rshift_double (l1, h1, count, prec, &s1l, &s1h, 0); |
555 | lshift_double (l1, h1, prec - count, prec, &s2l, &s2h, 0); | |
556 | *lv = s1l | s2l; | |
557 | *hv = s1h | s2h; | |
2bc77e10 | 558 | } |
559 | \f | |
b572011e | 560 | /* Divide doubleword integer LNUM, HNUM by doubleword integer LDEN, HDEN |
2bc77e10 | 561 | for a quotient (stored in *LQUO, *HQUO) and remainder (in *LREM, *HREM). |
562 | CODE is a tree code for a kind of division, one of | |
563 | TRUNC_DIV_EXPR, FLOOR_DIV_EXPR, CEIL_DIV_EXPR, ROUND_DIV_EXPR | |
564 | or EXACT_DIV_EXPR | |
20dd417a | 565 | It controls how the quotient is rounded to an integer. |
b9e999f0 | 566 | Return nonzero if the operation overflows. |
2bc77e10 | 567 | UNS nonzero says do unsigned division. */ |
568 | ||
15ca565e | 569 | int |
de1b648b | 570 | div_and_round_double (enum tree_code code, int uns, |
571 | unsigned HOST_WIDE_INT lnum_orig, /* num == numerator == dividend */ | |
572 | HOST_WIDE_INT hnum_orig, | |
573 | unsigned HOST_WIDE_INT lden_orig, /* den == denominator == divisor */ | |
dc81944a | 574 | HOST_WIDE_INT hden_orig, |
575 | unsigned HOST_WIDE_INT *lquo, | |
de1b648b | 576 | HOST_WIDE_INT *hquo, unsigned HOST_WIDE_INT *lrem, |
577 | HOST_WIDE_INT *hrem) | |
2bc77e10 | 578 | { |
579 | int quo_neg = 0; | |
bd5b3bce | 580 | HOST_WIDE_INT num[4 + 1]; /* extra element for scaling. */ |
581 | HOST_WIDE_INT den[4], quo[4]; | |
19cb6b50 | 582 | int i, j; |
bd5b3bce | 583 | unsigned HOST_WIDE_INT work; |
a0c2c45b | 584 | unsigned HOST_WIDE_INT carry = 0; |
585 | unsigned HOST_WIDE_INT lnum = lnum_orig; | |
abd9ac9c | 586 | HOST_WIDE_INT hnum = hnum_orig; |
a0c2c45b | 587 | unsigned HOST_WIDE_INT lden = lden_orig; |
abd9ac9c | 588 | HOST_WIDE_INT hden = hden_orig; |
b9e999f0 | 589 | int overflow = 0; |
2bc77e10 | 590 | |
a0c2c45b | 591 | if (hden == 0 && lden == 0) |
ad87de1e | 592 | overflow = 1, lden = 1; |
2bc77e10 | 593 | |
139c3f48 | 594 | /* Calculate quotient sign and convert operands to unsigned. */ |
cc049fa3 | 595 | if (!uns) |
2bc77e10 | 596 | { |
b9e999f0 | 597 | if (hnum < 0) |
2bc77e10 | 598 | { |
599 | quo_neg = ~ quo_neg; | |
b9e999f0 | 600 | /* (minimum integer) / (-1) is the only overflow case. */ |
a0c2c45b | 601 | if (neg_double (lnum, hnum, &lnum, &hnum) |
602 | && ((HOST_WIDE_INT) lden & hden) == -1) | |
b9e999f0 | 603 | overflow = 1; |
2bc77e10 | 604 | } |
cc049fa3 | 605 | if (hden < 0) |
2bc77e10 | 606 | { |
607 | quo_neg = ~ quo_neg; | |
b9e999f0 | 608 | neg_double (lden, hden, &lden, &hden); |
2bc77e10 | 609 | } |
610 | } | |
611 | ||
612 | if (hnum == 0 && hden == 0) | |
613 | { /* single precision */ | |
614 | *hquo = *hrem = 0; | |
802ddb63 | 615 | /* This unsigned division rounds toward zero. */ |
a0c2c45b | 616 | *lquo = lnum / lden; |
2bc77e10 | 617 | goto finish_up; |
618 | } | |
619 | ||
620 | if (hnum == 0) | |
621 | { /* trivial case: dividend < divisor */ | |
622 | /* hden != 0 already checked. */ | |
623 | *hquo = *lquo = 0; | |
624 | *hrem = hnum; | |
625 | *lrem = lnum; | |
626 | goto finish_up; | |
627 | } | |
628 | ||
f0af5a88 | 629 | memset (quo, 0, sizeof quo); |
2bc77e10 | 630 | |
f0af5a88 | 631 | memset (num, 0, sizeof num); /* to zero 9th element */ |
632 | memset (den, 0, sizeof den); | |
2bc77e10 | 633 | |
cc049fa3 | 634 | encode (num, lnum, hnum); |
2bc77e10 | 635 | encode (den, lden, hden); |
636 | ||
bd5b3bce | 637 | /* Special code for when the divisor < BASE. */ |
a0c2c45b | 638 | if (hden == 0 && lden < (unsigned HOST_WIDE_INT) BASE) |
bd5b3bce | 639 | { |
2bc77e10 | 640 | /* hnum != 0 already checked. */ |
bd5b3bce | 641 | for (i = 4 - 1; i >= 0; i--) |
2bc77e10 | 642 | { |
bd5b3bce | 643 | work = num[i] + carry * BASE; |
a0c2c45b | 644 | quo[i] = work / lden; |
645 | carry = work % lden; | |
2bc77e10 | 646 | } |
647 | } | |
bd5b3bce | 648 | else |
649 | { | |
650 | /* Full double precision division, | |
651 | with thanks to Don Knuth's "Seminumerical Algorithms". */ | |
a0c2c45b | 652 | int num_hi_sig, den_hi_sig; |
653 | unsigned HOST_WIDE_INT quo_est, scale; | |
2bc77e10 | 654 | |
6ef828f9 | 655 | /* Find the highest nonzero divisor digit. */ |
cc049fa3 | 656 | for (i = 4 - 1;; i--) |
657 | if (den[i] != 0) | |
658 | { | |
659 | den_hi_sig = i; | |
660 | break; | |
661 | } | |
bd5b3bce | 662 | |
a0c2c45b | 663 | /* Insure that the first digit of the divisor is at least BASE/2. |
664 | This is required by the quotient digit estimation algorithm. */ | |
2bc77e10 | 665 | |
a0c2c45b | 666 | scale = BASE / (den[den_hi_sig] + 1); |
667 | if (scale > 1) | |
668 | { /* scale divisor and dividend */ | |
669 | carry = 0; | |
670 | for (i = 0; i <= 4 - 1; i++) | |
671 | { | |
672 | work = (num[i] * scale) + carry; | |
673 | num[i] = LOWPART (work); | |
674 | carry = HIGHPART (work); | |
675 | } | |
2bc77e10 | 676 | |
a0c2c45b | 677 | num[4] = carry; |
678 | carry = 0; | |
679 | for (i = 0; i <= 4 - 1; i++) | |
680 | { | |
681 | work = (den[i] * scale) + carry; | |
682 | den[i] = LOWPART (work); | |
683 | carry = HIGHPART (work); | |
684 | if (den[i] != 0) den_hi_sig = i; | |
685 | } | |
686 | } | |
2bc77e10 | 687 | |
a0c2c45b | 688 | num_hi_sig = 4; |
2bc77e10 | 689 | |
a0c2c45b | 690 | /* Main loop */ |
691 | for (i = num_hi_sig - den_hi_sig - 1; i >= 0; i--) | |
2bc77e10 | 692 | { |
a0c2c45b | 693 | /* Guess the next quotient digit, quo_est, by dividing the first |
694 | two remaining dividend digits by the high order quotient digit. | |
695 | quo_est is never low and is at most 2 high. */ | |
696 | unsigned HOST_WIDE_INT tmp; | |
697 | ||
698 | num_hi_sig = i + den_hi_sig + 1; | |
699 | work = num[num_hi_sig] * BASE + num[num_hi_sig - 1]; | |
700 | if (num[num_hi_sig] != den[den_hi_sig]) | |
701 | quo_est = work / den[den_hi_sig]; | |
702 | else | |
703 | quo_est = BASE - 1; | |
2bc77e10 | 704 | |
1e625a2e | 705 | /* Refine quo_est so it's usually correct, and at most one high. */ |
a0c2c45b | 706 | tmp = work - quo_est * den[den_hi_sig]; |
707 | if (tmp < BASE | |
708 | && (den[den_hi_sig - 1] * quo_est | |
709 | > (tmp * BASE + num[num_hi_sig - 2]))) | |
710 | quo_est--; | |
2bc77e10 | 711 | |
a0c2c45b | 712 | /* Try QUO_EST as the quotient digit, by multiplying the |
713 | divisor by QUO_EST and subtracting from the remaining dividend. | |
714 | Keep in mind that QUO_EST is the I - 1st digit. */ | |
715 | ||
716 | carry = 0; | |
2bc77e10 | 717 | for (j = 0; j <= den_hi_sig; j++) |
718 | { | |
a0c2c45b | 719 | work = quo_est * den[j] + carry; |
bd5b3bce | 720 | carry = HIGHPART (work); |
a0c2c45b | 721 | work = num[i + j] - LOWPART (work); |
bd5b3bce | 722 | num[i + j] = LOWPART (work); |
a0c2c45b | 723 | carry += HIGHPART (work) != 0; |
2bc77e10 | 724 | } |
2bc77e10 | 725 | |
a0c2c45b | 726 | /* If quo_est was high by one, then num[i] went negative and |
727 | we need to correct things. */ | |
f9a532b0 | 728 | if (num[num_hi_sig] < (HOST_WIDE_INT) carry) |
a0c2c45b | 729 | { |
730 | quo_est--; | |
731 | carry = 0; /* add divisor back in */ | |
732 | for (j = 0; j <= den_hi_sig; j++) | |
733 | { | |
734 | work = num[i + j] + den[j] + carry; | |
735 | carry = HIGHPART (work); | |
736 | num[i + j] = LOWPART (work); | |
737 | } | |
738 | ||
739 | num [num_hi_sig] += carry; | |
740 | } | |
741 | ||
742 | /* Store the quotient digit. */ | |
743 | quo[i] = quo_est; | |
744 | } | |
2bc77e10 | 745 | } |
2bc77e10 | 746 | |
747 | decode (quo, lquo, hquo); | |
748 | ||
749 | finish_up: | |
b4b174c3 | 750 | /* If result is negative, make it so. */ |
2bc77e10 | 751 | if (quo_neg) |
752 | neg_double (*lquo, *hquo, lquo, hquo); | |
753 | ||
aab2cf92 | 754 | /* Compute trial remainder: rem = num - (quo * den) */ |
2bc77e10 | 755 | mul_double (*lquo, *hquo, lden_orig, hden_orig, lrem, hrem); |
756 | neg_double (*lrem, *hrem, lrem, hrem); | |
757 | add_double (lnum_orig, hnum_orig, *lrem, *hrem, lrem, hrem); | |
758 | ||
759 | switch (code) | |
760 | { | |
761 | case TRUNC_DIV_EXPR: | |
762 | case TRUNC_MOD_EXPR: /* round toward zero */ | |
763 | case EXACT_DIV_EXPR: /* for this one, it shouldn't matter */ | |
b9e999f0 | 764 | return overflow; |
2bc77e10 | 765 | |
766 | case FLOOR_DIV_EXPR: | |
767 | case FLOOR_MOD_EXPR: /* round toward negative infinity */ | |
768 | if (quo_neg && (*lrem != 0 || *hrem != 0)) /* ratio < 0 && rem != 0 */ | |
769 | { | |
770 | /* quo = quo - 1; */ | |
b572011e | 771 | add_double (*lquo, *hquo, (HOST_WIDE_INT) -1, (HOST_WIDE_INT) -1, |
772 | lquo, hquo); | |
2bc77e10 | 773 | } |
a0c2c45b | 774 | else |
775 | return overflow; | |
2bc77e10 | 776 | break; |
777 | ||
778 | case CEIL_DIV_EXPR: | |
779 | case CEIL_MOD_EXPR: /* round toward positive infinity */ | |
780 | if (!quo_neg && (*lrem != 0 || *hrem != 0)) /* ratio > 0 && rem != 0 */ | |
781 | { | |
b572011e | 782 | add_double (*lquo, *hquo, (HOST_WIDE_INT) 1, (HOST_WIDE_INT) 0, |
783 | lquo, hquo); | |
2bc77e10 | 784 | } |
a0c2c45b | 785 | else |
786 | return overflow; | |
2bc77e10 | 787 | break; |
cc049fa3 | 788 | |
2bc77e10 | 789 | case ROUND_DIV_EXPR: |
790 | case ROUND_MOD_EXPR: /* round to closest integer */ | |
791 | { | |
a0c2c45b | 792 | unsigned HOST_WIDE_INT labs_rem = *lrem; |
793 | HOST_WIDE_INT habs_rem = *hrem; | |
794 | unsigned HOST_WIDE_INT labs_den = lden, ltwice; | |
795 | HOST_WIDE_INT habs_den = hden, htwice; | |
796 | ||
2358393e | 797 | /* Get absolute values. */ |
a0c2c45b | 798 | if (*hrem < 0) |
799 | neg_double (*lrem, *hrem, &labs_rem, &habs_rem); | |
800 | if (hden < 0) | |
801 | neg_double (lden, hden, &labs_den, &habs_den); | |
802 | ||
803 | /* If (2 * abs (lrem) >= abs (lden)) */ | |
b572011e | 804 | mul_double ((HOST_WIDE_INT) 2, (HOST_WIDE_INT) 0, |
805 | labs_rem, habs_rem, <wice, &htwice); | |
a0c2c45b | 806 | |
b572011e | 807 | if (((unsigned HOST_WIDE_INT) habs_den |
808 | < (unsigned HOST_WIDE_INT) htwice) | |
809 | || (((unsigned HOST_WIDE_INT) habs_den | |
810 | == (unsigned HOST_WIDE_INT) htwice) | |
a0c2c45b | 811 | && (labs_den < ltwice))) |
2bc77e10 | 812 | { |
813 | if (*hquo < 0) | |
814 | /* quo = quo - 1; */ | |
b572011e | 815 | add_double (*lquo, *hquo, |
816 | (HOST_WIDE_INT) -1, (HOST_WIDE_INT) -1, lquo, hquo); | |
2bc77e10 | 817 | else |
818 | /* quo = quo + 1; */ | |
b572011e | 819 | add_double (*lquo, *hquo, (HOST_WIDE_INT) 1, (HOST_WIDE_INT) 0, |
820 | lquo, hquo); | |
2bc77e10 | 821 | } |
a0c2c45b | 822 | else |
823 | return overflow; | |
2bc77e10 | 824 | } |
825 | break; | |
826 | ||
827 | default: | |
fdada98f | 828 | gcc_unreachable (); |
2bc77e10 | 829 | } |
830 | ||
21dda4ee | 831 | /* Compute true remainder: rem = num - (quo * den) */ |
2bc77e10 | 832 | mul_double (*lquo, *hquo, lden_orig, hden_orig, lrem, hrem); |
833 | neg_double (*lrem, *hrem, lrem, hrem); | |
834 | add_double (lnum_orig, hnum_orig, *lrem, *hrem, lrem, hrem); | |
b9e999f0 | 835 | return overflow; |
2bc77e10 | 836 | } |
837 | \f | |
bd214d13 | 838 | /* Return true if built-in mathematical function specified by CODE |
839 | preserves the sign of it argument, i.e. -f(x) == f(-x). */ | |
840 | ||
841 | static bool | |
842 | negate_mathfn_p (enum built_in_function code) | |
843 | { | |
844 | switch (code) | |
845 | { | |
846 | case BUILT_IN_ASIN: | |
847 | case BUILT_IN_ASINF: | |
848 | case BUILT_IN_ASINL: | |
849 | case BUILT_IN_ATAN: | |
850 | case BUILT_IN_ATANF: | |
851 | case BUILT_IN_ATANL: | |
852 | case BUILT_IN_SIN: | |
853 | case BUILT_IN_SINF: | |
854 | case BUILT_IN_SINL: | |
855 | case BUILT_IN_TAN: | |
856 | case BUILT_IN_TANF: | |
857 | case BUILT_IN_TANL: | |
858 | return true; | |
859 | ||
860 | default: | |
861 | break; | |
862 | } | |
863 | return false; | |
864 | } | |
865 | ||
bb445479 | 866 | /* Check whether we may negate an integer constant T without causing |
867 | overflow. */ | |
868 | ||
869 | bool | |
870 | may_negate_without_overflow_p (tree t) | |
871 | { | |
872 | unsigned HOST_WIDE_INT val; | |
873 | unsigned int prec; | |
874 | tree type; | |
875 | ||
fdada98f | 876 | gcc_assert (TREE_CODE (t) == INTEGER_CST); |
bb445479 | 877 | |
878 | type = TREE_TYPE (t); | |
879 | if (TYPE_UNSIGNED (type)) | |
880 | return false; | |
881 | ||
882 | prec = TYPE_PRECISION (type); | |
883 | if (prec > HOST_BITS_PER_WIDE_INT) | |
884 | { | |
885 | if (TREE_INT_CST_LOW (t) != 0) | |
886 | return true; | |
887 | prec -= HOST_BITS_PER_WIDE_INT; | |
888 | val = TREE_INT_CST_HIGH (t); | |
889 | } | |
890 | else | |
891 | val = TREE_INT_CST_LOW (t); | |
892 | if (prec < HOST_BITS_PER_WIDE_INT) | |
893 | val &= ((unsigned HOST_WIDE_INT) 1 << prec) - 1; | |
894 | return val != ((unsigned HOST_WIDE_INT) 1 << (prec - 1)); | |
895 | } | |
896 | ||
22331643 | 897 | /* Determine whether an expression T can be cheaply negated using |
898 | the function negate_expr. */ | |
899 | ||
900 | static bool | |
de1b648b | 901 | negate_expr_p (tree t) |
22331643 | 902 | { |
22331643 | 903 | tree type; |
904 | ||
905 | if (t == 0) | |
906 | return false; | |
907 | ||
908 | type = TREE_TYPE (t); | |
909 | ||
910 | STRIP_SIGN_NOPS (t); | |
911 | switch (TREE_CODE (t)) | |
912 | { | |
913 | case INTEGER_CST: | |
78a8ed03 | 914 | if (TYPE_UNSIGNED (type) || ! flag_trapv) |
bd214d13 | 915 | return true; |
22331643 | 916 | |
917 | /* Check that -CST will not overflow type. */ | |
bb445479 | 918 | return may_negate_without_overflow_p (t); |
22331643 | 919 | |
920 | case REAL_CST: | |
921 | case NEGATE_EXPR: | |
22331643 | 922 | return true; |
923 | ||
bd214d13 | 924 | case COMPLEX_CST: |
925 | return negate_expr_p (TREE_REALPART (t)) | |
926 | && negate_expr_p (TREE_IMAGPART (t)); | |
927 | ||
2169cab6 | 928 | case PLUS_EXPR: |
929 | if (FLOAT_TYPE_P (type) && !flag_unsafe_math_optimizations) | |
930 | return false; | |
931 | /* -(A + B) -> (-B) - A. */ | |
932 | if (negate_expr_p (TREE_OPERAND (t, 1)) | |
933 | && reorder_operands_p (TREE_OPERAND (t, 0), | |
934 | TREE_OPERAND (t, 1))) | |
935 | return true; | |
936 | /* -(A + B) -> (-A) - B. */ | |
937 | return negate_expr_p (TREE_OPERAND (t, 0)); | |
938 | ||
d842742d | 939 | case MINUS_EXPR: |
940 | /* We can't turn -(A-B) into B-A when we honor signed zeros. */ | |
bd214d13 | 941 | return (! FLOAT_TYPE_P (type) || flag_unsafe_math_optimizations) |
942 | && reorder_operands_p (TREE_OPERAND (t, 0), | |
943 | TREE_OPERAND (t, 1)); | |
d842742d | 944 | |
a12ecaaa | 945 | case MULT_EXPR: |
78a8ed03 | 946 | if (TYPE_UNSIGNED (TREE_TYPE (t))) |
a12ecaaa | 947 | break; |
948 | ||
949 | /* Fall through. */ | |
950 | ||
951 | case RDIV_EXPR: | |
952 | if (! HONOR_SIGN_DEPENDENT_ROUNDING (TYPE_MODE (TREE_TYPE (t)))) | |
953 | return negate_expr_p (TREE_OPERAND (t, 1)) | |
954 | || negate_expr_p (TREE_OPERAND (t, 0)); | |
955 | break; | |
956 | ||
bd214d13 | 957 | case NOP_EXPR: |
958 | /* Negate -((double)float) as (double)(-float). */ | |
959 | if (TREE_CODE (type) == REAL_TYPE) | |
960 | { | |
961 | tree tem = strip_float_extensions (t); | |
962 | if (tem != t) | |
963 | return negate_expr_p (tem); | |
964 | } | |
965 | break; | |
966 | ||
967 | case CALL_EXPR: | |
968 | /* Negate -f(x) as f(-x). */ | |
969 | if (negate_mathfn_p (builtin_mathfn_code (t))) | |
970 | return negate_expr_p (TREE_VALUE (TREE_OPERAND (t, 1))); | |
971 | break; | |
972 | ||
a22fd555 | 973 | case RSHIFT_EXPR: |
974 | /* Optimize -((int)x >> 31) into (unsigned)x >> 31. */ | |
975 | if (TREE_CODE (TREE_OPERAND (t, 1)) == INTEGER_CST) | |
976 | { | |
977 | tree op1 = TREE_OPERAND (t, 1); | |
978 | if (TREE_INT_CST_HIGH (op1) == 0 | |
979 | && (unsigned HOST_WIDE_INT) (TYPE_PRECISION (type) - 1) | |
980 | == TREE_INT_CST_LOW (op1)) | |
981 | return true; | |
982 | } | |
983 | break; | |
984 | ||
22331643 | 985 | default: |
986 | break; | |
987 | } | |
988 | return false; | |
989 | } | |
990 | ||
23ec2d5e | 991 | /* Given T, an expression, return the negation of T. Allow for T to be |
992 | null, in which case return null. */ | |
2bc77e10 | 993 | |
23ec2d5e | 994 | static tree |
de1b648b | 995 | negate_expr (tree t) |
23ec2d5e | 996 | { |
997 | tree type; | |
998 | tree tem; | |
999 | ||
1000 | if (t == 0) | |
1001 | return 0; | |
1002 | ||
1003 | type = TREE_TYPE (t); | |
1004 | STRIP_SIGN_NOPS (t); | |
1005 | ||
1006 | switch (TREE_CODE (t)) | |
1007 | { | |
1008 | case INTEGER_CST: | |
9d77437d | 1009 | tem = fold_negate_const (t, type); |
bd214d13 | 1010 | if (! TREE_OVERFLOW (tem) |
78a8ed03 | 1011 | || TYPE_UNSIGNED (type) |
bd214d13 | 1012 | || ! flag_trapv) |
23ec2d5e | 1013 | return tem; |
1014 | break; | |
1015 | ||
a12ecaaa | 1016 | case REAL_CST: |
9d77437d | 1017 | tem = fold_negate_const (t, type); |
a12ecaaa | 1018 | /* Two's complement FP formats, such as c4x, may overflow. */ |
bd214d13 | 1019 | if (! TREE_OVERFLOW (tem) || ! flag_trapping_math) |
b30e3dbc | 1020 | return fold_convert (type, tem); |
a12ecaaa | 1021 | break; |
1022 | ||
bd214d13 | 1023 | case COMPLEX_CST: |
1024 | { | |
1025 | tree rpart = negate_expr (TREE_REALPART (t)); | |
1026 | tree ipart = negate_expr (TREE_IMAGPART (t)); | |
1027 | ||
1028 | if ((TREE_CODE (rpart) == REAL_CST | |
1029 | && TREE_CODE (ipart) == REAL_CST) | |
1030 | || (TREE_CODE (rpart) == INTEGER_CST | |
1031 | && TREE_CODE (ipart) == INTEGER_CST)) | |
1032 | return build_complex (type, rpart, ipart); | |
1033 | } | |
1034 | break; | |
1035 | ||
23ec2d5e | 1036 | case NEGATE_EXPR: |
b30e3dbc | 1037 | return fold_convert (type, TREE_OPERAND (t, 0)); |
23ec2d5e | 1038 | |
2169cab6 | 1039 | case PLUS_EXPR: |
1040 | if (! FLOAT_TYPE_P (type) || flag_unsafe_math_optimizations) | |
1041 | { | |
1042 | /* -(A + B) -> (-B) - A. */ | |
1043 | if (negate_expr_p (TREE_OPERAND (t, 1)) | |
1044 | && reorder_operands_p (TREE_OPERAND (t, 0), | |
1045 | TREE_OPERAND (t, 1))) | |
fd96eeef | 1046 | { |
1047 | tem = negate_expr (TREE_OPERAND (t, 1)); | |
1048 | tem = fold (build2 (MINUS_EXPR, TREE_TYPE (t), | |
1049 | tem, TREE_OPERAND (t, 0))); | |
1050 | return fold_convert (type, tem); | |
1051 | } | |
1052 | ||
2169cab6 | 1053 | /* -(A + B) -> (-A) - B. */ |
1054 | if (negate_expr_p (TREE_OPERAND (t, 0))) | |
fd96eeef | 1055 | { |
1056 | tem = negate_expr (TREE_OPERAND (t, 0)); | |
1057 | tem = fold (build2 (MINUS_EXPR, TREE_TYPE (t), | |
1058 | tem, TREE_OPERAND (t, 1))); | |
1059 | return fold_convert (type, tem); | |
1060 | } | |
2169cab6 | 1061 | } |
1062 | break; | |
1063 | ||
23ec2d5e | 1064 | case MINUS_EXPR: |
1065 | /* - (A - B) -> B - A */ | |
bd214d13 | 1066 | if ((! FLOAT_TYPE_P (type) || flag_unsafe_math_optimizations) |
1067 | && reorder_operands_p (TREE_OPERAND (t, 0), TREE_OPERAND (t, 1))) | |
b30e3dbc | 1068 | return fold_convert (type, |
fd96eeef | 1069 | fold (build2 (MINUS_EXPR, TREE_TYPE (t), |
1070 | TREE_OPERAND (t, 1), | |
1071 | TREE_OPERAND (t, 0)))); | |
23ec2d5e | 1072 | break; |
1073 | ||
a12ecaaa | 1074 | case MULT_EXPR: |
78a8ed03 | 1075 | if (TYPE_UNSIGNED (TREE_TYPE (t))) |
a12ecaaa | 1076 | break; |
1077 | ||
1078 | /* Fall through. */ | |
1079 | ||
1080 | case RDIV_EXPR: | |
1081 | if (! HONOR_SIGN_DEPENDENT_ROUNDING (TYPE_MODE (TREE_TYPE (t)))) | |
1082 | { | |
1083 | tem = TREE_OPERAND (t, 1); | |
1084 | if (negate_expr_p (tem)) | |
b30e3dbc | 1085 | return fold_convert (type, |
fd96eeef | 1086 | fold (build2 (TREE_CODE (t), TREE_TYPE (t), |
1087 | TREE_OPERAND (t, 0), | |
1088 | negate_expr (tem)))); | |
a12ecaaa | 1089 | tem = TREE_OPERAND (t, 0); |
1090 | if (negate_expr_p (tem)) | |
b30e3dbc | 1091 | return fold_convert (type, |
fd96eeef | 1092 | fold (build2 (TREE_CODE (t), TREE_TYPE (t), |
1093 | negate_expr (tem), | |
1094 | TREE_OPERAND (t, 1)))); | |
a12ecaaa | 1095 | } |
1096 | break; | |
1097 | ||
bd214d13 | 1098 | case NOP_EXPR: |
1099 | /* Convert -((double)float) into (double)(-float). */ | |
1100 | if (TREE_CODE (type) == REAL_TYPE) | |
1101 | { | |
1102 | tem = strip_float_extensions (t); | |
1103 | if (tem != t && negate_expr_p (tem)) | |
b30e3dbc | 1104 | return fold_convert (type, negate_expr (tem)); |
bd214d13 | 1105 | } |
1106 | break; | |
1107 | ||
1108 | case CALL_EXPR: | |
1109 | /* Negate -f(x) as f(-x). */ | |
1110 | if (negate_mathfn_p (builtin_mathfn_code (t)) | |
1111 | && negate_expr_p (TREE_VALUE (TREE_OPERAND (t, 1)))) | |
1112 | { | |
1113 | tree fndecl, arg, arglist; | |
1114 | ||
1115 | fndecl = get_callee_fndecl (t); | |
1116 | arg = negate_expr (TREE_VALUE (TREE_OPERAND (t, 1))); | |
1117 | arglist = build_tree_list (NULL_TREE, arg); | |
1118 | return build_function_call_expr (fndecl, arglist); | |
1119 | } | |
1120 | break; | |
1121 | ||
a22fd555 | 1122 | case RSHIFT_EXPR: |
1123 | /* Optimize -((int)x >> 31) into (unsigned)x >> 31. */ | |
1124 | if (TREE_CODE (TREE_OPERAND (t, 1)) == INTEGER_CST) | |
1125 | { | |
1126 | tree op1 = TREE_OPERAND (t, 1); | |
1127 | if (TREE_INT_CST_HIGH (op1) == 0 | |
1128 | && (unsigned HOST_WIDE_INT) (TYPE_PRECISION (type) - 1) | |
1129 | == TREE_INT_CST_LOW (op1)) | |
1130 | { | |
78a8ed03 | 1131 | tree ntype = TYPE_UNSIGNED (type) |
fa8b888f | 1132 | ? lang_hooks.types.signed_type (type) |
1133 | : lang_hooks.types.unsigned_type (type); | |
a22fd555 | 1134 | tree temp = fold_convert (ntype, TREE_OPERAND (t, 0)); |
1135 | temp = fold (build2 (RSHIFT_EXPR, ntype, temp, op1)); | |
1136 | return fold_convert (type, temp); | |
1137 | } | |
1138 | } | |
1139 | break; | |
1140 | ||
23ec2d5e | 1141 | default: |
1142 | break; | |
1143 | } | |
1144 | ||
b30e3dbc | 1145 | tem = fold (build1 (NEGATE_EXPR, TREE_TYPE (t), t)); |
1146 | return fold_convert (type, tem); | |
23ec2d5e | 1147 | } |
1148 | \f | |
1149 | /* Split a tree IN into a constant, literal and variable parts that could be | |
1150 | combined with CODE to make IN. "constant" means an expression with | |
1151 | TREE_CONSTANT but that isn't an actual constant. CODE must be a | |
1152 | commutative arithmetic operation. Store the constant part into *CONP, | |
b07ba9ff | 1153 | the literal in *LITP and return the variable part. If a part isn't |
23ec2d5e | 1154 | present, set it to null. If the tree does not decompose in this way, |
1155 | return the entire tree as the variable part and the other parts as null. | |
1156 | ||
1157 | If CODE is PLUS_EXPR we also split trees that use MINUS_EXPR. In that | |
b07ba9ff | 1158 | case, we negate an operand that was subtracted. Except if it is a |
1159 | literal for which we use *MINUS_LITP instead. | |
1160 | ||
1161 | If NEGATE_P is true, we are negating all of IN, again except a literal | |
1162 | for which we use *MINUS_LITP instead. | |
23ec2d5e | 1163 | |
1164 | If IN is itself a literal or constant, return it as appropriate. | |
1165 | ||
1166 | Note that we do not guarantee that any of the three values will be the | |
1167 | same type as IN, but they will have the same signedness and mode. */ | |
1168 | ||
1169 | static tree | |
dc81944a | 1170 | split_tree (tree in, enum tree_code code, tree *conp, tree *litp, |
1171 | tree *minus_litp, int negate_p) | |
2bc77e10 | 1172 | { |
23ec2d5e | 1173 | tree var = 0; |
1174 | ||
2bc77e10 | 1175 | *conp = 0; |
23ec2d5e | 1176 | *litp = 0; |
b07ba9ff | 1177 | *minus_litp = 0; |
23ec2d5e | 1178 | |
6312a35e | 1179 | /* Strip any conversions that don't change the machine mode or signedness. */ |
23ec2d5e | 1180 | STRIP_SIGN_NOPS (in); |
1181 | ||
1182 | if (TREE_CODE (in) == INTEGER_CST || TREE_CODE (in) == REAL_CST) | |
1183 | *litp = in; | |
23ec2d5e | 1184 | else if (TREE_CODE (in) == code |
1185 | || (! FLOAT_TYPE_P (TREE_TYPE (in)) | |
1186 | /* We can associate addition and subtraction together (even | |
1187 | though the C standard doesn't say so) for integers because | |
1188 | the value is not affected. For reals, the value might be | |
1189 | affected, so we can't. */ | |
1190 | && ((code == PLUS_EXPR && TREE_CODE (in) == MINUS_EXPR) | |
1191 | || (code == MINUS_EXPR && TREE_CODE (in) == PLUS_EXPR)))) | |
1192 | { | |
1193 | tree op0 = TREE_OPERAND (in, 0); | |
1194 | tree op1 = TREE_OPERAND (in, 1); | |
1195 | int neg1_p = TREE_CODE (in) == MINUS_EXPR; | |
1196 | int neg_litp_p = 0, neg_conp_p = 0, neg_var_p = 0; | |
1197 | ||
1198 | /* First see if either of the operands is a literal, then a constant. */ | |
1199 | if (TREE_CODE (op0) == INTEGER_CST || TREE_CODE (op0) == REAL_CST) | |
1200 | *litp = op0, op0 = 0; | |
1201 | else if (TREE_CODE (op1) == INTEGER_CST || TREE_CODE (op1) == REAL_CST) | |
1202 | *litp = op1, neg_litp_p = neg1_p, op1 = 0; | |
1203 | ||
1204 | if (op0 != 0 && TREE_CONSTANT (op0)) | |
1205 | *conp = op0, op0 = 0; | |
1206 | else if (op1 != 0 && TREE_CONSTANT (op1)) | |
1207 | *conp = op1, neg_conp_p = neg1_p, op1 = 0; | |
1208 | ||
1209 | /* If we haven't dealt with either operand, this is not a case we can | |
6312a35e | 1210 | decompose. Otherwise, VAR is either of the ones remaining, if any. */ |
23ec2d5e | 1211 | if (op0 != 0 && op1 != 0) |
1212 | var = in; | |
1213 | else if (op0 != 0) | |
1214 | var = op0; | |
1215 | else | |
1216 | var = op1, neg_var_p = neg1_p; | |
2bc77e10 | 1217 | |
23ec2d5e | 1218 | /* Now do any needed negations. */ |
b07ba9ff | 1219 | if (neg_litp_p) |
1220 | *minus_litp = *litp, *litp = 0; | |
1221 | if (neg_conp_p) | |
1222 | *conp = negate_expr (*conp); | |
1223 | if (neg_var_p) | |
1224 | var = negate_expr (var); | |
23ec2d5e | 1225 | } |
8541c166 | 1226 | else if (TREE_CONSTANT (in)) |
1227 | *conp = in; | |
23ec2d5e | 1228 | else |
1229 | var = in; | |
1230 | ||
1231 | if (negate_p) | |
2bc77e10 | 1232 | { |
b07ba9ff | 1233 | if (*litp) |
1234 | *minus_litp = *litp, *litp = 0; | |
1235 | else if (*minus_litp) | |
1236 | *litp = *minus_litp, *minus_litp = 0; | |
23ec2d5e | 1237 | *conp = negate_expr (*conp); |
b07ba9ff | 1238 | var = negate_expr (var); |
2bc77e10 | 1239 | } |
23ec2d5e | 1240 | |
1241 | return var; | |
1242 | } | |
1243 | ||
1244 | /* Re-associate trees split by the above function. T1 and T2 are either | |
1245 | expressions to associate or null. Return the new expression, if any. If | |
b07ba9ff | 1246 | we build an operation, do it in TYPE and with CODE. */ |
23ec2d5e | 1247 | |
1248 | static tree | |
de1b648b | 1249 | associate_trees (tree t1, tree t2, enum tree_code code, tree type) |
23ec2d5e | 1250 | { |
23ec2d5e | 1251 | if (t1 == 0) |
1252 | return t2; | |
1253 | else if (t2 == 0) | |
1254 | return t1; | |
1255 | ||
23ec2d5e | 1256 | /* If either input is CODE, a PLUS_EXPR, or a MINUS_EXPR, don't |
1257 | try to fold this since we will have infinite recursion. But do | |
1258 | deal with any NEGATE_EXPRs. */ | |
1259 | if (TREE_CODE (t1) == code || TREE_CODE (t2) == code | |
1260 | || TREE_CODE (t1) == MINUS_EXPR || TREE_CODE (t2) == MINUS_EXPR) | |
1261 | { | |
5a3fb4d3 | 1262 | if (code == PLUS_EXPR) |
1263 | { | |
1264 | if (TREE_CODE (t1) == NEGATE_EXPR) | |
fd96eeef | 1265 | return build2 (MINUS_EXPR, type, fold_convert (type, t2), |
1266 | fold_convert (type, TREE_OPERAND (t1, 0))); | |
5a3fb4d3 | 1267 | else if (TREE_CODE (t2) == NEGATE_EXPR) |
fd96eeef | 1268 | return build2 (MINUS_EXPR, type, fold_convert (type, t1), |
1269 | fold_convert (type, TREE_OPERAND (t2, 0))); | |
faab57e3 | 1270 | else if (integer_zerop (t2)) |
1271 | return fold_convert (type, t1); | |
5a3fb4d3 | 1272 | } |
faab57e3 | 1273 | else if (code == MINUS_EXPR) |
1274 | { | |
1275 | if (integer_zerop (t2)) | |
1276 | return fold_convert (type, t1); | |
1277 | } | |
1278 | ||
fd96eeef | 1279 | return build2 (code, type, fold_convert (type, t1), |
1280 | fold_convert (type, t2)); | |
23ec2d5e | 1281 | } |
1282 | ||
fd96eeef | 1283 | return fold (build2 (code, type, fold_convert (type, t1), |
1284 | fold_convert (type, t2))); | |
2bc77e10 | 1285 | } |
1286 | \f | |
0dbd1c74 | 1287 | /* Combine two integer constants ARG1 and ARG2 under operation CODE |
2bc77e10 | 1288 | to produce a new constant. |
5485823f | 1289 | |
15d769aa | 1290 | If NOTRUNC is nonzero, do not truncate the result to fit the data type. */ |
2bc77e10 | 1291 | |
4ee9c684 | 1292 | tree |
de1b648b | 1293 | int_const_binop (enum tree_code code, tree arg1, tree arg2, int notrunc) |
2bc77e10 | 1294 | { |
a0c2c45b | 1295 | unsigned HOST_WIDE_INT int1l, int2l; |
1296 | HOST_WIDE_INT int1h, int2h; | |
1297 | unsigned HOST_WIDE_INT low; | |
1298 | HOST_WIDE_INT hi; | |
1299 | unsigned HOST_WIDE_INT garbagel; | |
1300 | HOST_WIDE_INT garbageh; | |
19cb6b50 | 1301 | tree t; |
15d769aa | 1302 | tree type = TREE_TYPE (arg1); |
78a8ed03 | 1303 | int uns = TYPE_UNSIGNED (type); |
15d769aa | 1304 | int is_sizetype |
1305 | = (TREE_CODE (type) == INTEGER_TYPE && TYPE_IS_SIZETYPE (type)); | |
0dbd1c74 | 1306 | int overflow = 0; |
1307 | int no_overflow = 0; | |
8ea862a9 | 1308 | |
0dbd1c74 | 1309 | int1l = TREE_INT_CST_LOW (arg1); |
1310 | int1h = TREE_INT_CST_HIGH (arg1); | |
1311 | int2l = TREE_INT_CST_LOW (arg2); | |
1312 | int2h = TREE_INT_CST_HIGH (arg2); | |
1313 | ||
1314 | switch (code) | |
2bc77e10 | 1315 | { |
0dbd1c74 | 1316 | case BIT_IOR_EXPR: |
1317 | low = int1l | int2l, hi = int1h | int2h; | |
1318 | break; | |
2bc77e10 | 1319 | |
0dbd1c74 | 1320 | case BIT_XOR_EXPR: |
1321 | low = int1l ^ int2l, hi = int1h ^ int2h; | |
1322 | break; | |
2bc77e10 | 1323 | |
0dbd1c74 | 1324 | case BIT_AND_EXPR: |
1325 | low = int1l & int2l, hi = int1h & int2h; | |
1326 | break; | |
2bc77e10 | 1327 | |
0dbd1c74 | 1328 | case RSHIFT_EXPR: |
cc049fa3 | 1329 | int2l = -int2l; |
0dbd1c74 | 1330 | case LSHIFT_EXPR: |
1331 | /* It's unclear from the C standard whether shifts can overflow. | |
1332 | The following code ignores overflow; perhaps a C standard | |
1333 | interpretation ruling is needed. */ | |
15d769aa | 1334 | lshift_double (int1l, int1h, int2l, TYPE_PRECISION (type), |
02e7a332 | 1335 | &low, &hi, !uns); |
0dbd1c74 | 1336 | no_overflow = 1; |
1337 | break; | |
2bc77e10 | 1338 | |
0dbd1c74 | 1339 | case RROTATE_EXPR: |
1340 | int2l = - int2l; | |
1341 | case LROTATE_EXPR: | |
15d769aa | 1342 | lrotate_double (int1l, int1h, int2l, TYPE_PRECISION (type), |
0dbd1c74 | 1343 | &low, &hi); |
1344 | break; | |
2bc77e10 | 1345 | |
0dbd1c74 | 1346 | case PLUS_EXPR: |
1347 | overflow = add_double (int1l, int1h, int2l, int2h, &low, &hi); | |
1348 | break; | |
2bc77e10 | 1349 | |
0dbd1c74 | 1350 | case MINUS_EXPR: |
1351 | neg_double (int2l, int2h, &low, &hi); | |
1352 | add_double (int1l, int1h, low, hi, &low, &hi); | |
083a2b5e | 1353 | overflow = OVERFLOW_SUM_SIGN (hi, int2h, int1h); |
0dbd1c74 | 1354 | break; |
2bc77e10 | 1355 | |
0dbd1c74 | 1356 | case MULT_EXPR: |
1357 | overflow = mul_double (int1l, int1h, int2l, int2h, &low, &hi); | |
1358 | break; | |
2bc77e10 | 1359 | |
0dbd1c74 | 1360 | case TRUNC_DIV_EXPR: |
1361 | case FLOOR_DIV_EXPR: case CEIL_DIV_EXPR: | |
1362 | case EXACT_DIV_EXPR: | |
1363 | /* This is a shortcut for a common special case. */ | |
a0c2c45b | 1364 | if (int2h == 0 && (HOST_WIDE_INT) int2l > 0 |
0dbd1c74 | 1365 | && ! TREE_CONSTANT_OVERFLOW (arg1) |
1366 | && ! TREE_CONSTANT_OVERFLOW (arg2) | |
a0c2c45b | 1367 | && int1h == 0 && (HOST_WIDE_INT) int1l >= 0) |
0dbd1c74 | 1368 | { |
1369 | if (code == CEIL_DIV_EXPR) | |
1370 | int1l += int2l - 1; | |
a0c2c45b | 1371 | |
0dbd1c74 | 1372 | low = int1l / int2l, hi = 0; |
2bc77e10 | 1373 | break; |
0dbd1c74 | 1374 | } |
2bc77e10 | 1375 | |
6312a35e | 1376 | /* ... fall through ... */ |
2bc77e10 | 1377 | |
cc049fa3 | 1378 | case ROUND_DIV_EXPR: |
0dbd1c74 | 1379 | if (int2h == 0 && int2l == 1) |
1380 | { | |
1381 | low = int1l, hi = int1h; | |
2bc77e10 | 1382 | break; |
0dbd1c74 | 1383 | } |
1384 | if (int1l == int2l && int1h == int2h | |
1385 | && ! (int1l == 0 && int1h == 0)) | |
1386 | { | |
1387 | low = 1, hi = 0; | |
c13e6dce | 1388 | break; |
0dbd1c74 | 1389 | } |
15d769aa | 1390 | overflow = div_and_round_double (code, uns, int1l, int1h, int2l, int2h, |
0dbd1c74 | 1391 | &low, &hi, &garbagel, &garbageh); |
1392 | break; | |
c13e6dce | 1393 | |
0dbd1c74 | 1394 | case TRUNC_MOD_EXPR: |
1395 | case FLOOR_MOD_EXPR: case CEIL_MOD_EXPR: | |
1396 | /* This is a shortcut for a common special case. */ | |
a0c2c45b | 1397 | if (int2h == 0 && (HOST_WIDE_INT) int2l > 0 |
0dbd1c74 | 1398 | && ! TREE_CONSTANT_OVERFLOW (arg1) |
1399 | && ! TREE_CONSTANT_OVERFLOW (arg2) | |
a0c2c45b | 1400 | && int1h == 0 && (HOST_WIDE_INT) int1l >= 0) |
0dbd1c74 | 1401 | { |
1402 | if (code == CEIL_MOD_EXPR) | |
1403 | int1l += int2l - 1; | |
1404 | low = int1l % int2l, hi = 0; | |
c13e6dce | 1405 | break; |
0dbd1c74 | 1406 | } |
c13e6dce | 1407 | |
6312a35e | 1408 | /* ... fall through ... */ |
0dbd1c74 | 1409 | |
cc049fa3 | 1410 | case ROUND_MOD_EXPR: |
0dbd1c74 | 1411 | overflow = div_and_round_double (code, uns, |
1412 | int1l, int1h, int2l, int2h, | |
1413 | &garbagel, &garbageh, &low, &hi); | |
1414 | break; | |
1415 | ||
1416 | case MIN_EXPR: | |
1417 | case MAX_EXPR: | |
1418 | if (uns) | |
083a2b5e | 1419 | low = (((unsigned HOST_WIDE_INT) int1h |
1420 | < (unsigned HOST_WIDE_INT) int2h) | |
1421 | || (((unsigned HOST_WIDE_INT) int1h | |
1422 | == (unsigned HOST_WIDE_INT) int2h) | |
a0c2c45b | 1423 | && int1l < int2l)); |
a3f1e3ec | 1424 | else |
a0c2c45b | 1425 | low = (int1h < int2h |
1426 | || (int1h == int2h && int1l < int2l)); | |
083a2b5e | 1427 | |
0dbd1c74 | 1428 | if (low == (code == MIN_EXPR)) |
1429 | low = int1l, hi = int1h; | |
1430 | else | |
1431 | low = int2l, hi = int2h; | |
1432 | break; | |
8ea862a9 | 1433 | |
0dbd1c74 | 1434 | default: |
fdada98f | 1435 | gcc_unreachable (); |
8ea862a9 | 1436 | } |
0dbd1c74 | 1437 | |
7016c612 | 1438 | t = build_int_cst_wide (TREE_TYPE (arg1), low, hi); |
0dbd1c74 | 1439 | |
4d28c5d1 | 1440 | if (notrunc) |
1441 | { | |
1442 | /* Propagate overflow flags ourselves. */ | |
1443 | if (((!uns || is_sizetype) && overflow) | |
1444 | | TREE_OVERFLOW (arg1) | TREE_OVERFLOW (arg2)) | |
00b76131 | 1445 | { |
1446 | t = copy_node (t); | |
1447 | TREE_OVERFLOW (t) = 1; | |
1448 | TREE_CONSTANT_OVERFLOW (t) = 1; | |
1449 | } | |
1450 | else if (TREE_CONSTANT_OVERFLOW (arg1) | TREE_CONSTANT_OVERFLOW (arg2)) | |
1451 | { | |
1452 | t = copy_node (t); | |
1453 | TREE_CONSTANT_OVERFLOW (t) = 1; | |
1454 | } | |
4d28c5d1 | 1455 | } |
1456 | else | |
1457 | t = force_fit_type (t, 1, | |
1458 | ((!uns || is_sizetype) && overflow) | |
1459 | | TREE_OVERFLOW (arg1) | TREE_OVERFLOW (arg2), | |
1460 | TREE_CONSTANT_OVERFLOW (arg1) | |
1461 | | TREE_CONSTANT_OVERFLOW (arg2)); | |
0c5713a2 | 1462 | |
0dbd1c74 | 1463 | return t; |
1464 | } | |
1465 | ||
083a2b5e | 1466 | /* Combine two constants ARG1 and ARG2 under operation CODE to produce a new |
1467 | constant. We assume ARG1 and ARG2 have the same data type, or at least | |
1468 | are the same kind of constant and the same machine mode. | |
0dbd1c74 | 1469 | |
1470 | If NOTRUNC is nonzero, do not truncate the result to fit the data type. */ | |
1471 | ||
1472 | static tree | |
de1b648b | 1473 | const_binop (enum tree_code code, tree arg1, tree arg2, int notrunc) |
0dbd1c74 | 1474 | { |
cc049fa3 | 1475 | STRIP_NOPS (arg1); |
1476 | STRIP_NOPS (arg2); | |
0dbd1c74 | 1477 | |
1478 | if (TREE_CODE (arg1) == INTEGER_CST) | |
15d769aa | 1479 | return int_const_binop (code, arg1, arg2, notrunc); |
0dbd1c74 | 1480 | |
2bc77e10 | 1481 | if (TREE_CODE (arg1) == REAL_CST) |
1482 | { | |
276beea2 | 1483 | enum machine_mode mode; |
9a24cfc6 | 1484 | REAL_VALUE_TYPE d1; |
1485 | REAL_VALUE_TYPE d2; | |
536f5fb1 | 1486 | REAL_VALUE_TYPE value; |
276beea2 | 1487 | tree t, type; |
2bc77e10 | 1488 | |
9a24cfc6 | 1489 | d1 = TREE_REAL_CST (arg1); |
1490 | d2 = TREE_REAL_CST (arg2); | |
9248d3e0 | 1491 | |
276beea2 | 1492 | type = TREE_TYPE (arg1); |
1493 | mode = TYPE_MODE (type); | |
1494 | ||
1495 | /* Don't perform operation if we honor signaling NaNs and | |
1496 | either operand is a NaN. */ | |
1497 | if (HONOR_SNANS (mode) | |
1498 | && (REAL_VALUE_ISNAN (d1) || REAL_VALUE_ISNAN (d2))) | |
1499 | return NULL_TREE; | |
1500 | ||
1501 | /* Don't perform operation if it would raise a division | |
1502 | by zero exception. */ | |
1503 | if (code == RDIV_EXPR | |
1504 | && REAL_VALUES_EQUAL (d2, dconst0) | |
1505 | && (flag_trapping_math || ! MODE_HAS_INFINITIES (mode))) | |
1506 | return NULL_TREE; | |
1507 | ||
9248d3e0 | 1508 | /* If either operand is a NaN, just return it. Otherwise, set up |
1509 | for floating-point trap; we return an overflow. */ | |
1510 | if (REAL_VALUE_ISNAN (d1)) | |
1511 | return arg1; | |
1512 | else if (REAL_VALUE_ISNAN (d2)) | |
1513 | return arg2; | |
70192c5e | 1514 | |
536f5fb1 | 1515 | REAL_ARITHMETIC (value, code, d1, d2); |
cc049fa3 | 1516 | |
276beea2 | 1517 | t = build_real (type, real_value_truncate (mode, value)); |
23fed9b2 | 1518 | |
4d28c5d1 | 1519 | TREE_OVERFLOW (t) = TREE_OVERFLOW (arg1) | TREE_OVERFLOW (arg2); |
23fed9b2 | 1520 | TREE_CONSTANT_OVERFLOW (t) |
1521 | = TREE_OVERFLOW (t) | |
1522 | | TREE_CONSTANT_OVERFLOW (arg1) | |
1523 | | TREE_CONSTANT_OVERFLOW (arg2); | |
c0244247 | 1524 | return t; |
2bc77e10 | 1525 | } |
2bc77e10 | 1526 | if (TREE_CODE (arg1) == COMPLEX_CST) |
1527 | { | |
19cb6b50 | 1528 | tree type = TREE_TYPE (arg1); |
1529 | tree r1 = TREE_REALPART (arg1); | |
1530 | tree i1 = TREE_IMAGPART (arg1); | |
1531 | tree r2 = TREE_REALPART (arg2); | |
1532 | tree i2 = TREE_IMAGPART (arg2); | |
1533 | tree t; | |
2bc77e10 | 1534 | |
1535 | switch (code) | |
1536 | { | |
1537 | case PLUS_EXPR: | |
5b2ade4d | 1538 | t = build_complex (type, |
1539 | const_binop (PLUS_EXPR, r1, r2, notrunc), | |
5485823f | 1540 | const_binop (PLUS_EXPR, i1, i2, notrunc)); |
2bc77e10 | 1541 | break; |
1542 | ||
1543 | case MINUS_EXPR: | |
5b2ade4d | 1544 | t = build_complex (type, |
1545 | const_binop (MINUS_EXPR, r1, r2, notrunc), | |
5485823f | 1546 | const_binop (MINUS_EXPR, i1, i2, notrunc)); |
2bc77e10 | 1547 | break; |
1548 | ||
1549 | case MULT_EXPR: | |
5b2ade4d | 1550 | t = build_complex (type, |
1551 | const_binop (MINUS_EXPR, | |
5485823f | 1552 | const_binop (MULT_EXPR, |
1553 | r1, r2, notrunc), | |
1554 | const_binop (MULT_EXPR, | |
1555 | i1, i2, notrunc), | |
1556 | notrunc), | |
2bc77e10 | 1557 | const_binop (PLUS_EXPR, |
5485823f | 1558 | const_binop (MULT_EXPR, |
1559 | r1, i2, notrunc), | |
1560 | const_binop (MULT_EXPR, | |
1561 | i1, r2, notrunc), | |
1562 | notrunc)); | |
2bc77e10 | 1563 | break; |
1564 | ||
1565 | case RDIV_EXPR: | |
1566 | { | |
19cb6b50 | 1567 | tree magsquared |
2bc77e10 | 1568 | = const_binop (PLUS_EXPR, |
5485823f | 1569 | const_binop (MULT_EXPR, r2, r2, notrunc), |
1570 | const_binop (MULT_EXPR, i2, i2, notrunc), | |
1571 | notrunc); | |
56d9b5a8 | 1572 | |
5b2ade4d | 1573 | t = build_complex (type, |
1574 | const_binop | |
1575 | (INTEGRAL_TYPE_P (TREE_TYPE (r1)) | |
1576 | ? TRUNC_DIV_EXPR : RDIV_EXPR, | |
1577 | const_binop (PLUS_EXPR, | |
1578 | const_binop (MULT_EXPR, r1, r2, | |
1579 | notrunc), | |
1580 | const_binop (MULT_EXPR, i1, i2, | |
1581 | notrunc), | |
1582 | notrunc), | |
1583 | magsquared, notrunc), | |
1584 | const_binop | |
1585 | (INTEGRAL_TYPE_P (TREE_TYPE (r1)) | |
1586 | ? TRUNC_DIV_EXPR : RDIV_EXPR, | |
1587 | const_binop (MINUS_EXPR, | |
1588 | const_binop (MULT_EXPR, i1, r2, | |
1589 | notrunc), | |
1590 | const_binop (MULT_EXPR, r1, i2, | |
1591 | notrunc), | |
1592 | notrunc), | |
1593 | magsquared, notrunc)); | |
2bc77e10 | 1594 | } |
1595 | break; | |
1596 | ||
1597 | default: | |
fdada98f | 1598 | gcc_unreachable (); |
2bc77e10 | 1599 | } |
2bc77e10 | 1600 | return t; |
1601 | } | |
1602 | return 0; | |
1603 | } | |
15d769aa | 1604 | |
85390276 | 1605 | /* Create a size type INT_CST node with NUMBER sign extended. KIND |
1606 | indicates which particular sizetype to create. */ | |
083a2b5e | 1607 | |
902de8ed | 1608 | tree |
1e9d55d7 | 1609 | size_int_kind (HOST_WIDE_INT number, enum size_type_kind kind) |
902de8ed | 1610 | { |
85390276 | 1611 | return build_int_cst (sizetype_tab[(int) kind], number); |
902de8ed | 1612 | } |
85390276 | 1613 | \f |
902de8ed | 1614 | /* Combine operands OP1 and OP2 with arithmetic operation CODE. CODE |
1615 | is a tree code. The type of the result is taken from the operands. | |
1616 | Both must be the same type integer type and it must be a size type. | |
2bc77e10 | 1617 | If the operands are constant, so is the result. */ |
1618 | ||
1619 | tree | |
de1b648b | 1620 | size_binop (enum tree_code code, tree arg0, tree arg1) |
2bc77e10 | 1621 | { |
902de8ed | 1622 | tree type = TREE_TYPE (arg0); |
1623 | ||
fdada98f | 1624 | gcc_assert (TREE_CODE (type) == INTEGER_TYPE && TYPE_IS_SIZETYPE (type) |
1625 | && type == TREE_TYPE (arg1)); | |
902de8ed | 1626 | |
2bc77e10 | 1627 | /* Handle the special case of two integer constants faster. */ |
1628 | if (TREE_CODE (arg0) == INTEGER_CST && TREE_CODE (arg1) == INTEGER_CST) | |
1629 | { | |
1630 | /* And some specific cases even faster than that. */ | |
a7baffe5 | 1631 | if (code == PLUS_EXPR && integer_zerop (arg0)) |
2bc77e10 | 1632 | return arg1; |
a7baffe5 | 1633 | else if ((code == MINUS_EXPR || code == PLUS_EXPR) |
1634 | && integer_zerop (arg1)) | |
2bc77e10 | 1635 | return arg0; |
a7baffe5 | 1636 | else if (code == MULT_EXPR && integer_onep (arg0)) |
2bc77e10 | 1637 | return arg1; |
a7baffe5 | 1638 | |
2bc77e10 | 1639 | /* Handle general case of two integer constants. */ |
15d769aa | 1640 | return int_const_binop (code, arg0, arg1, 0); |
2bc77e10 | 1641 | } |
1642 | ||
1643 | if (arg0 == error_mark_node || arg1 == error_mark_node) | |
1644 | return error_mark_node; | |
1645 | ||
fd96eeef | 1646 | return fold (build2 (code, type, arg0, arg1)); |
2bc77e10 | 1647 | } |
3fd3b688 | 1648 | |
902de8ed | 1649 | /* Given two values, either both of sizetype or both of bitsizetype, |
1650 | compute the difference between the two values. Return the value | |
1651 | in signed type corresponding to the type of the operands. */ | |
3fd3b688 | 1652 | |
1653 | tree | |
de1b648b | 1654 | size_diffop (tree arg0, tree arg1) |
3fd3b688 | 1655 | { |
902de8ed | 1656 | tree type = TREE_TYPE (arg0); |
1657 | tree ctype; | |
3fd3b688 | 1658 | |
fdada98f | 1659 | gcc_assert (TREE_CODE (type) == INTEGER_TYPE && TYPE_IS_SIZETYPE (type) |
1660 | && type == TREE_TYPE (arg1)); | |
3fd3b688 | 1661 | |
902de8ed | 1662 | /* If the type is already signed, just do the simple thing. */ |
78a8ed03 | 1663 | if (!TYPE_UNSIGNED (type)) |
902de8ed | 1664 | return size_binop (MINUS_EXPR, arg0, arg1); |
1665 | ||
e2134ab3 | 1666 | ctype = type == bitsizetype ? sbitsizetype : ssizetype; |
902de8ed | 1667 | |
1668 | /* If either operand is not a constant, do the conversions to the signed | |
1669 | type and subtract. The hardware will do the right thing with any | |
1670 | overflow in the subtraction. */ | |
1671 | if (TREE_CODE (arg0) != INTEGER_CST || TREE_CODE (arg1) != INTEGER_CST) | |
b30e3dbc | 1672 | return size_binop (MINUS_EXPR, fold_convert (ctype, arg0), |
1673 | fold_convert (ctype, arg1)); | |
902de8ed | 1674 | |
1675 | /* If ARG0 is larger than ARG1, subtract and return the result in CTYPE. | |
1676 | Otherwise, subtract the other way, convert to CTYPE (we know that can't | |
1677 | overflow) and negate (which can't either). Special-case a result | |
1678 | of zero while we're here. */ | |
1679 | if (tree_int_cst_equal (arg0, arg1)) | |
b30e3dbc | 1680 | return fold_convert (ctype, integer_zero_node); |
902de8ed | 1681 | else if (tree_int_cst_lt (arg1, arg0)) |
b30e3dbc | 1682 | return fold_convert (ctype, size_binop (MINUS_EXPR, arg0, arg1)); |
902de8ed | 1683 | else |
b30e3dbc | 1684 | return size_binop (MINUS_EXPR, fold_convert (ctype, integer_zero_node), |
1685 | fold_convert (ctype, size_binop (MINUS_EXPR, | |
1686 | arg1, arg0))); | |
3fd3b688 | 1687 | } |
2bc77e10 | 1688 | \f |
80db63ef | 1689 | /* Construct a vector of zero elements of vector type TYPE. */ |
1690 | ||
1691 | static tree | |
1692 | build_zero_vector (tree type) | |
1693 | { | |
1694 | tree elem, list; | |
1695 | int i, units; | |
1696 | ||
1697 | elem = fold_convert_const (NOP_EXPR, TREE_TYPE (type), integer_zero_node); | |
1698 | units = TYPE_VECTOR_SUBPARTS (type); | |
1699 | ||
1700 | list = NULL_TREE; | |
1701 | for (i = 0; i < units; i++) | |
1702 | list = tree_cons (NULL_TREE, elem, list); | |
1703 | return build_vector (type, list); | |
1704 | } | |
1705 | ||
70192c5e | 1706 | |
04b253e8 | 1707 | /* Attempt to fold type conversion operation CODE of expression ARG1 to |
1708 | type TYPE. If no simplification can be done return NULL_TREE. */ | |
2bc77e10 | 1709 | |
1710 | static tree | |
04b253e8 | 1711 | fold_convert_const (enum tree_code code, tree type, tree arg1) |
2bc77e10 | 1712 | { |
23fed9b2 | 1713 | int overflow = 0; |
04b253e8 | 1714 | tree t; |
1715 | ||
1716 | if (TREE_TYPE (arg1) == type) | |
1717 | return arg1; | |
2bc77e10 | 1718 | |
997d68fe | 1719 | if (POINTER_TYPE_P (type) || INTEGRAL_TYPE_P (type)) |
2bc77e10 | 1720 | { |
1721 | if (TREE_CODE (arg1) == INTEGER_CST) | |
1722 | { | |
ccf05f85 | 1723 | /* If we would build a constant wider than GCC supports, |
1724 | leave the conversion unfolded. */ | |
1725 | if (TYPE_PRECISION (type) > 2 * HOST_BITS_PER_WIDE_INT) | |
04b253e8 | 1726 | return NULL_TREE; |
ccf05f85 | 1727 | |
2bc77e10 | 1728 | /* Given an integer constant, make new constant with new type, |
1729 | appropriately sign-extended or truncated. */ | |
7016c612 | 1730 | t = build_int_cst_wide (type, TREE_INT_CST_LOW (arg1), |
1731 | TREE_INT_CST_HIGH (arg1)); | |
4d28c5d1 | 1732 | |
1733 | t = force_fit_type (t, | |
1734 | /* Don't set the overflow when | |
1735 | converting a pointer */ | |
1736 | !POINTER_TYPE_P (TREE_TYPE (arg1)), | |
1737 | (TREE_INT_CST_HIGH (arg1) < 0 | |
1738 | && (TYPE_UNSIGNED (type) | |
1739 | < TYPE_UNSIGNED (TREE_TYPE (arg1)))) | |
1740 | | TREE_OVERFLOW (arg1), | |
1741 | TREE_CONSTANT_OVERFLOW (arg1)); | |
04b253e8 | 1742 | return t; |
2bc77e10 | 1743 | } |
2bc77e10 | 1744 | else if (TREE_CODE (arg1) == REAL_CST) |
1745 | { | |
67c65562 | 1746 | /* The following code implements the floating point to integer |
1747 | conversion rules required by the Java Language Specification, | |
1748 | that IEEE NaNs are mapped to zero and values that overflow | |
1749 | the target precision saturate, i.e. values greater than | |
1750 | INT_MAX are mapped to INT_MAX, and values less than INT_MIN | |
1751 | are mapped to INT_MIN. These semantics are allowed by the | |
1752 | C and C++ standards that simply state that the behavior of | |
1753 | FP-to-integer conversion is unspecified upon overflow. */ | |
1754 | ||
1755 | HOST_WIDE_INT high, low; | |
04b253e8 | 1756 | REAL_VALUE_TYPE r; |
67c65562 | 1757 | REAL_VALUE_TYPE x = TREE_REAL_CST (arg1); |
04b253e8 | 1758 | |
1759 | switch (code) | |
1760 | { | |
1761 | case FIX_TRUNC_EXPR: | |
1762 | real_trunc (&r, VOIDmode, &x); | |
1763 | break; | |
1764 | ||
1765 | case FIX_CEIL_EXPR: | |
1766 | real_ceil (&r, VOIDmode, &x); | |
1767 | break; | |
1768 | ||
1769 | case FIX_FLOOR_EXPR: | |
1770 | real_floor (&r, VOIDmode, &x); | |
1771 | break; | |
1772 | ||
50c90ea2 | 1773 | case FIX_ROUND_EXPR: |
1774 | real_round (&r, VOIDmode, &x); | |
1775 | break; | |
1776 | ||
04b253e8 | 1777 | default: |
fdada98f | 1778 | gcc_unreachable (); |
04b253e8 | 1779 | } |
1780 | ||
1781 | /* If R is NaN, return zero and show we have an overflow. */ | |
1782 | if (REAL_VALUE_ISNAN (r)) | |
67c65562 | 1783 | { |
1784 | overflow = 1; | |
1785 | high = 0; | |
1786 | low = 0; | |
1787 | } | |
f52483b5 | 1788 | |
04b253e8 | 1789 | /* See if R is less than the lower bound or greater than the |
1790 | upper bound. */ | |
23fed9b2 | 1791 | |
67c65562 | 1792 | if (! overflow) |
1793 | { | |
1794 | tree lt = TYPE_MIN_VALUE (type); | |
1795 | REAL_VALUE_TYPE l = real_value_from_int_cst (NULL_TREE, lt); | |
04b253e8 | 1796 | if (REAL_VALUES_LESS (r, l)) |
67c65562 | 1797 | { |
1798 | overflow = 1; | |
1799 | high = TREE_INT_CST_HIGH (lt); | |
1800 | low = TREE_INT_CST_LOW (lt); | |
1801 | } | |
1802 | } | |
1803 | ||
1804 | if (! overflow) | |
1805 | { | |
1806 | tree ut = TYPE_MAX_VALUE (type); | |
1807 | if (ut) | |
1808 | { | |
1809 | REAL_VALUE_TYPE u = real_value_from_int_cst (NULL_TREE, ut); | |
04b253e8 | 1810 | if (REAL_VALUES_LESS (u, r)) |
67c65562 | 1811 | { |
1812 | overflow = 1; | |
1813 | high = TREE_INT_CST_HIGH (ut); | |
1814 | low = TREE_INT_CST_LOW (ut); | |
1815 | } | |
1816 | } | |
1817 | } | |
1818 | ||
1819 | if (! overflow) | |
04b253e8 | 1820 | REAL_VALUE_TO_INT (&low, &high, r); |
67c65562 | 1821 | |
7016c612 | 1822 | t = build_int_cst_wide (type, low, high); |
4d28c5d1 | 1823 | |
1824 | t = force_fit_type (t, -1, overflow | TREE_OVERFLOW (arg1), | |
1825 | TREE_CONSTANT_OVERFLOW (arg1)); | |
04b253e8 | 1826 | return t; |
2bc77e10 | 1827 | } |
2bc77e10 | 1828 | } |
1829 | else if (TREE_CODE (type) == REAL_TYPE) | |
1830 | { | |
2bc77e10 | 1831 | if (TREE_CODE (arg1) == INTEGER_CST) |
1832 | return build_real_from_int_cst (type, arg1); | |
2bc77e10 | 1833 | if (TREE_CODE (arg1) == REAL_CST) |
c0244247 | 1834 | { |
9248d3e0 | 1835 | if (REAL_VALUE_ISNAN (TREE_REAL_CST (arg1))) |
55a78ca1 | 1836 | { |
95ed90bf | 1837 | /* We make a copy of ARG1 so that we don't modify an |
1838 | existing constant tree. */ | |
1839 | t = copy_node (arg1); | |
1840 | TREE_TYPE (t) = type; | |
55a78ca1 | 1841 | return t; |
1842 | } | |
70192c5e | 1843 | |
536f5fb1 | 1844 | t = build_real (type, |
1845 | real_value_truncate (TYPE_MODE (type), | |
1846 | TREE_REAL_CST (arg1))); | |
23fed9b2 | 1847 | |
4d28c5d1 | 1848 | TREE_OVERFLOW (t) = TREE_OVERFLOW (arg1); |
23fed9b2 | 1849 | TREE_CONSTANT_OVERFLOW (t) |
1850 | = TREE_OVERFLOW (t) | TREE_CONSTANT_OVERFLOW (arg1); | |
c0244247 | 1851 | return t; |
1852 | } | |
2bc77e10 | 1853 | } |
04b253e8 | 1854 | return NULL_TREE; |
2bc77e10 | 1855 | } |
b30e3dbc | 1856 | |
1857 | /* Convert expression ARG to type TYPE. Used by the middle-end for | |
1858 | simple conversions in preference to calling the front-end's convert. */ | |
1859 | ||
d7aeca92 | 1860 | tree |
b30e3dbc | 1861 | fold_convert (tree type, tree arg) |
1862 | { | |
1863 | tree orig = TREE_TYPE (arg); | |
1864 | tree tem; | |
1865 | ||
1866 | if (type == orig) | |
1867 | return arg; | |
1868 | ||
1869 | if (TREE_CODE (arg) == ERROR_MARK | |
1870 | || TREE_CODE (type) == ERROR_MARK | |
1871 | || TREE_CODE (orig) == ERROR_MARK) | |
1872 | return error_mark_node; | |
1873 | ||
88e62366 | 1874 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (orig) |
1875 | || lang_hooks.types_compatible_p (TYPE_MAIN_VARIANT (type), | |
1876 | TYPE_MAIN_VARIANT (orig))) | |
b30e3dbc | 1877 | return fold (build1 (NOP_EXPR, type, arg)); |
1878 | ||
fdada98f | 1879 | switch (TREE_CODE (type)) |
b30e3dbc | 1880 | { |
fdada98f | 1881 | case INTEGER_TYPE: case CHAR_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE: |
1882 | case POINTER_TYPE: case REFERENCE_TYPE: | |
1883 | case OFFSET_TYPE: | |
b30e3dbc | 1884 | if (TREE_CODE (arg) == INTEGER_CST) |
1885 | { | |
1886 | tem = fold_convert_const (NOP_EXPR, type, arg); | |
1887 | if (tem != NULL_TREE) | |
1888 | return tem; | |
1889 | } | |
8d4b8f86 | 1890 | if (INTEGRAL_TYPE_P (orig) || POINTER_TYPE_P (orig) |
1891 | || TREE_CODE (orig) == OFFSET_TYPE) | |
b30e3dbc | 1892 | return fold (build1 (NOP_EXPR, type, arg)); |
1893 | if (TREE_CODE (orig) == COMPLEX_TYPE) | |
1894 | { | |
1895 | tem = fold (build1 (REALPART_EXPR, TREE_TYPE (orig), arg)); | |
1896 | return fold_convert (type, tem); | |
1897 | } | |
fdada98f | 1898 | gcc_assert (TREE_CODE (orig) == VECTOR_TYPE |
1899 | && tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (orig))); | |
1900 | return fold (build1 (NOP_EXPR, type, arg)); | |
0c5713a2 | 1901 | |
fdada98f | 1902 | case REAL_TYPE: |
b30e3dbc | 1903 | if (TREE_CODE (arg) == INTEGER_CST) |
1904 | { | |
1905 | tem = fold_convert_const (FLOAT_EXPR, type, arg); | |
1906 | if (tem != NULL_TREE) | |
1907 | return tem; | |
1908 | } | |
1909 | else if (TREE_CODE (arg) == REAL_CST) | |
1910 | { | |
1911 | tem = fold_convert_const (NOP_EXPR, type, arg); | |
1912 | if (tem != NULL_TREE) | |
1913 | return tem; | |
1914 | } | |
1915 | ||
fdada98f | 1916 | switch (TREE_CODE (orig)) |
b30e3dbc | 1917 | { |
fdada98f | 1918 | case INTEGER_TYPE: case CHAR_TYPE: |
1919 | case BOOLEAN_TYPE: case ENUMERAL_TYPE: | |
1920 | case POINTER_TYPE: case REFERENCE_TYPE: | |
1921 | return fold (build1 (FLOAT_EXPR, type, arg)); | |
0c5713a2 | 1922 | |
fdada98f | 1923 | case REAL_TYPE: |
1924 | return fold (build1 (flag_float_store ? CONVERT_EXPR : NOP_EXPR, | |
1925 | type, arg)); | |
0c5713a2 | 1926 | |
fdada98f | 1927 | case COMPLEX_TYPE: |
b30e3dbc | 1928 | tem = fold (build1 (REALPART_EXPR, TREE_TYPE (orig), arg)); |
1929 | return fold_convert (type, tem); | |
0c5713a2 | 1930 | |
fdada98f | 1931 | default: |
1932 | gcc_unreachable (); | |
b30e3dbc | 1933 | } |
0c5713a2 | 1934 | |
fdada98f | 1935 | case COMPLEX_TYPE: |
1936 | switch (TREE_CODE (orig)) | |
1937 | { | |
1938 | case INTEGER_TYPE: case CHAR_TYPE: | |
1939 | case BOOLEAN_TYPE: case ENUMERAL_TYPE: | |
1940 | case POINTER_TYPE: case REFERENCE_TYPE: | |
1941 | case REAL_TYPE: | |
1942 | return build2 (COMPLEX_EXPR, type, | |
1943 | fold_convert (TREE_TYPE (type), arg), | |
1944 | fold_convert (TREE_TYPE (type), integer_zero_node)); | |
1945 | case COMPLEX_TYPE: | |
1946 | { | |
1947 | tree rpart, ipart; | |
0c5713a2 | 1948 | |
fdada98f | 1949 | if (TREE_CODE (arg) == COMPLEX_EXPR) |
1950 | { | |
1951 | rpart = fold_convert (TREE_TYPE (type), TREE_OPERAND (arg, 0)); | |
1952 | ipart = fold_convert (TREE_TYPE (type), TREE_OPERAND (arg, 1)); | |
1953 | return fold (build2 (COMPLEX_EXPR, type, rpart, ipart)); | |
1954 | } | |
0c5713a2 | 1955 | |
fdada98f | 1956 | arg = save_expr (arg); |
1957 | rpart = fold (build1 (REALPART_EXPR, TREE_TYPE (orig), arg)); | |
1958 | ipart = fold (build1 (IMAGPART_EXPR, TREE_TYPE (orig), arg)); | |
1959 | rpart = fold_convert (TREE_TYPE (type), rpart); | |
1960 | ipart = fold_convert (TREE_TYPE (type), ipart); | |
1961 | return fold (build2 (COMPLEX_EXPR, type, rpart, ipart)); | |
1962 | } | |
0c5713a2 | 1963 | |
fdada98f | 1964 | default: |
1965 | gcc_unreachable (); | |
1966 | } | |
0c5713a2 | 1967 | |
fdada98f | 1968 | case VECTOR_TYPE: |
80db63ef | 1969 | if (integer_zerop (arg)) |
1970 | return build_zero_vector (type); | |
fdada98f | 1971 | gcc_assert (tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (orig))); |
1972 | gcc_assert (INTEGRAL_TYPE_P (orig) || POINTER_TYPE_P (orig) | |
1973 | || TREE_CODE (orig) == VECTOR_TYPE); | |
1974 | return fold (build1 (NOP_EXPR, type, arg)); | |
b30e3dbc | 1975 | |
fdada98f | 1976 | case VOID_TYPE: |
1977 | return fold (build1 (CONVERT_EXPR, type, fold_ignored_result (arg))); | |
b30e3dbc | 1978 | |
fdada98f | 1979 | default: |
1980 | gcc_unreachable (); | |
b30e3dbc | 1981 | } |
b30e3dbc | 1982 | } |
2bc77e10 | 1983 | \f |
84791d69 | 1984 | /* Return an expr equal to X but certainly not valid as an lvalue. */ |
2bc77e10 | 1985 | |
1986 | tree | |
de1b648b | 1987 | non_lvalue (tree x) |
2bc77e10 | 1988 | { |
0dedabfa | 1989 | /* While we are in GIMPLE, NON_LVALUE_EXPR doesn't mean anything to |
1990 | us. */ | |
1991 | if (in_gimple_form) | |
1992 | return x; | |
1993 | ||
f4d47aeb | 1994 | /* We only need to wrap lvalue tree codes. */ |
1995 | switch (TREE_CODE (x)) | |
1996 | { | |
1997 | case VAR_DECL: | |
1998 | case PARM_DECL: | |
1999 | case RESULT_DECL: | |
2000 | case LABEL_DECL: | |
2001 | case FUNCTION_DECL: | |
2002 | case SSA_NAME: | |
2003 | ||
2004 | case COMPONENT_REF: | |
2005 | case INDIRECT_REF: | |
b056d812 | 2006 | case ALIGN_INDIRECT_REF: |
2007 | case MISALIGNED_INDIRECT_REF: | |
f4d47aeb | 2008 | case ARRAY_REF: |
6374121b | 2009 | case ARRAY_RANGE_REF: |
f4d47aeb | 2010 | case BIT_FIELD_REF: |
215e2f1d | 2011 | case OBJ_TYPE_REF: |
f4d47aeb | 2012 | |
2013 | case REALPART_EXPR: | |
2014 | case IMAGPART_EXPR: | |
2015 | case PREINCREMENT_EXPR: | |
2016 | case PREDECREMENT_EXPR: | |
2017 | case SAVE_EXPR: | |
f4d47aeb | 2018 | case TRY_CATCH_EXPR: |
2019 | case WITH_CLEANUP_EXPR: | |
2020 | case COMPOUND_EXPR: | |
2021 | case MODIFY_EXPR: | |
2022 | case TARGET_EXPR: | |
2023 | case COND_EXPR: | |
2024 | case BIND_EXPR: | |
2025 | case MIN_EXPR: | |
2026 | case MAX_EXPR: | |
f4d47aeb | 2027 | break; |
2028 | ||
2029 | default: | |
2030 | /* Assume the worst for front-end tree codes. */ | |
2031 | if ((int)TREE_CODE (x) >= NUM_TREE_CODES) | |
2032 | break; | |
84791d69 | 2033 | return x; |
f4d47aeb | 2034 | } |
4ee9c684 | 2035 | return build1 (NON_LVALUE_EXPR, TREE_TYPE (x), x); |
2bc77e10 | 2036 | } |
56753054 | 2037 | |
b12c26dc | 2038 | /* Nonzero means lvalues are limited to those valid in pedantic ANSI C. |
2039 | Zero means allow extended lvalues. */ | |
2040 | ||
2041 | int pedantic_lvalues; | |
2042 | ||
56753054 | 2043 | /* When pedantic, return an expr equal to X but certainly not valid as a |
2044 | pedantic lvalue. Otherwise, return X. */ | |
2045 | ||
d50efa49 | 2046 | static tree |
de1b648b | 2047 | pedantic_non_lvalue (tree x) |
56753054 | 2048 | { |
b12c26dc | 2049 | if (pedantic_lvalues) |
56753054 | 2050 | return non_lvalue (x); |
2051 | else | |
2052 | return x; | |
2053 | } | |
e233264a | 2054 | \f |
2055 | /* Given a tree comparison code, return the code that is the logical inverse | |
2056 | of the given code. It is not safe to do this for floating-point | |
318a728f | 2057 | comparisons, except for NE_EXPR and EQ_EXPR, so we receive a machine mode |
2058 | as well: if reversing the comparison is unsafe, return ERROR_MARK. */ | |
2bc77e10 | 2059 | |
e233264a | 2060 | static enum tree_code |
318a728f | 2061 | invert_tree_comparison (enum tree_code code, bool honor_nans) |
e233264a | 2062 | { |
318a728f | 2063 | if (honor_nans && flag_trapping_math) |
2064 | return ERROR_MARK; | |
2065 | ||
e233264a | 2066 | switch (code) |
2067 | { | |
2068 | case EQ_EXPR: | |
2069 | return NE_EXPR; | |
2070 | case NE_EXPR: | |
2071 | return EQ_EXPR; | |
2072 | case GT_EXPR: | |
318a728f | 2073 | return honor_nans ? UNLE_EXPR : LE_EXPR; |
e233264a | 2074 | case GE_EXPR: |
318a728f | 2075 | return honor_nans ? UNLT_EXPR : LT_EXPR; |
e233264a | 2076 | case LT_EXPR: |
318a728f | 2077 | return honor_nans ? UNGE_EXPR : GE_EXPR; |
e233264a | 2078 | case LE_EXPR: |
318a728f | 2079 | return honor_nans ? UNGT_EXPR : GT_EXPR; |
2080 | case LTGT_EXPR: | |
2081 | return UNEQ_EXPR; | |
2082 | case UNEQ_EXPR: | |
2083 | return LTGT_EXPR; | |
2084 | case UNGT_EXPR: | |
2085 | return LE_EXPR; | |
2086 | case UNGE_EXPR: | |
2087 | return LT_EXPR; | |
2088 | case UNLT_EXPR: | |
2089 | return GE_EXPR; | |
2090 | case UNLE_EXPR: | |
e233264a | 2091 | return GT_EXPR; |
318a728f | 2092 | case ORDERED_EXPR: |
2093 | return UNORDERED_EXPR; | |
2094 | case UNORDERED_EXPR: | |
2095 | return ORDERED_EXPR; | |
e233264a | 2096 | default: |
fdada98f | 2097 | gcc_unreachable (); |
e233264a | 2098 | } |
2099 | } | |
2100 | ||
2101 | /* Similar, but return the comparison that results if the operands are | |
2102 | swapped. This is safe for floating-point. */ | |
2103 | ||
cc0bdf91 | 2104 | enum tree_code |
de1b648b | 2105 | swap_tree_comparison (enum tree_code code) |
e233264a | 2106 | { |
2107 | switch (code) | |
2108 | { | |
2109 | case EQ_EXPR: | |
2110 | case NE_EXPR: | |
2111 | return code; | |
2112 | case GT_EXPR: | |
2113 | return LT_EXPR; | |
2114 | case GE_EXPR: | |
2115 | return LE_EXPR; | |
2116 | case LT_EXPR: | |
2117 | return GT_EXPR; | |
2118 | case LE_EXPR: | |
2119 | return GE_EXPR; | |
2120 | default: | |
fdada98f | 2121 | gcc_unreachable (); |
e233264a | 2122 | } |
2123 | } | |
8b94828f | 2124 | |
7835f163 | 2125 | |
2126 | /* Convert a comparison tree code from an enum tree_code representation | |
2127 | into a compcode bit-based encoding. This function is the inverse of | |
2128 | compcode_to_comparison. */ | |
2129 | ||
318a728f | 2130 | static enum comparison_code |
de1b648b | 2131 | comparison_to_compcode (enum tree_code code) |
7835f163 | 2132 | { |
2133 | switch (code) | |
2134 | { | |
2135 | case LT_EXPR: | |
2136 | return COMPCODE_LT; | |
2137 | case EQ_EXPR: | |
2138 | return COMPCODE_EQ; | |
2139 | case LE_EXPR: | |
2140 | return COMPCODE_LE; | |
2141 | case GT_EXPR: | |
2142 | return COMPCODE_GT; | |
2143 | case NE_EXPR: | |
2144 | return COMPCODE_NE; | |
2145 | case GE_EXPR: | |
2146 | return COMPCODE_GE; | |
318a728f | 2147 | case ORDERED_EXPR: |
2148 | return COMPCODE_ORD; | |
2149 | case UNORDERED_EXPR: | |
2150 | return COMPCODE_UNORD; | |
2151 | case UNLT_EXPR: | |
2152 | return COMPCODE_UNLT; | |
2153 | case UNEQ_EXPR: | |
2154 | return COMPCODE_UNEQ; | |
2155 | case UNLE_EXPR: | |
2156 | return COMPCODE_UNLE; | |
2157 | case UNGT_EXPR: | |
2158 | return COMPCODE_UNGT; | |
2159 | case LTGT_EXPR: | |
2160 | return COMPCODE_LTGT; | |
2161 | case UNGE_EXPR: | |
2162 | return COMPCODE_UNGE; | |
7835f163 | 2163 | default: |
fdada98f | 2164 | gcc_unreachable (); |
7835f163 | 2165 | } |
2166 | } | |
2167 | ||
2168 | /* Convert a compcode bit-based encoding of a comparison operator back | |
2169 | to GCC's enum tree_code representation. This function is the | |
2170 | inverse of comparison_to_compcode. */ | |
2171 | ||
2172 | static enum tree_code | |
318a728f | 2173 | compcode_to_comparison (enum comparison_code code) |
7835f163 | 2174 | { |
2175 | switch (code) | |
2176 | { | |
2177 | case COMPCODE_LT: | |
2178 | return LT_EXPR; | |
2179 | case COMPCODE_EQ: | |
2180 | return EQ_EXPR; | |
2181 | case COMPCODE_LE: | |
2182 | return LE_EXPR; | |
2183 | case COMPCODE_GT: | |
2184 | return GT_EXPR; | |
2185 | case COMPCODE_NE: | |
2186 | return NE_EXPR; | |
2187 | case COMPCODE_GE: | |
2188 | return GE_EXPR; | |
318a728f | 2189 | case COMPCODE_ORD: |
2190 | return ORDERED_EXPR; | |
2191 | case COMPCODE_UNORD: | |
2192 | return UNORDERED_EXPR; | |
2193 | case COMPCODE_UNLT: | |
2194 | return UNLT_EXPR; | |
2195 | case COMPCODE_UNEQ: | |
2196 | return UNEQ_EXPR; | |
2197 | case COMPCODE_UNLE: | |
2198 | return UNLE_EXPR; | |
2199 | case COMPCODE_UNGT: | |
2200 | return UNGT_EXPR; | |
2201 | case COMPCODE_LTGT: | |
2202 | return LTGT_EXPR; | |
2203 | case COMPCODE_UNGE: | |
2204 | return UNGE_EXPR; | |
7835f163 | 2205 | default: |
fdada98f | 2206 | gcc_unreachable (); |
7835f163 | 2207 | } |
2208 | } | |
2209 | ||
318a728f | 2210 | /* Return a tree for the comparison which is the combination of |
2211 | doing the AND or OR (depending on CODE) of the two operations LCODE | |
2212 | and RCODE on the identical operands LL_ARG and LR_ARG. Take into account | |
2213 | the possibility of trapping if the mode has NaNs, and return NULL_TREE | |
2214 | if this makes the transformation invalid. */ | |
2215 | ||
2216 | tree | |
2217 | combine_comparisons (enum tree_code code, enum tree_code lcode, | |
2218 | enum tree_code rcode, tree truth_type, | |
2219 | tree ll_arg, tree lr_arg) | |
2220 | { | |
2221 | bool honor_nans = HONOR_NANS (TYPE_MODE (TREE_TYPE (ll_arg))); | |
2222 | enum comparison_code lcompcode = comparison_to_compcode (lcode); | |
2223 | enum comparison_code rcompcode = comparison_to_compcode (rcode); | |
2224 | enum comparison_code compcode; | |
2225 | ||
2226 | switch (code) | |
2227 | { | |
2228 | case TRUTH_AND_EXPR: case TRUTH_ANDIF_EXPR: | |
2229 | compcode = lcompcode & rcompcode; | |
2230 | break; | |
2231 | ||
2232 | case TRUTH_OR_EXPR: case TRUTH_ORIF_EXPR: | |
2233 | compcode = lcompcode | rcompcode; | |
2234 | break; | |
2235 | ||
2236 | default: | |
2237 | return NULL_TREE; | |
2238 | } | |
2239 | ||
2240 | if (!honor_nans) | |
2241 | { | |
2242 | /* Eliminate unordered comparisons, as well as LTGT and ORD | |
2243 | which are not used unless the mode has NaNs. */ | |
2244 | compcode &= ~COMPCODE_UNORD; | |
2245 | if (compcode == COMPCODE_LTGT) | |
2246 | compcode = COMPCODE_NE; | |
2247 | else if (compcode == COMPCODE_ORD) | |
2248 | compcode = COMPCODE_TRUE; | |
2249 | } | |
2250 | else if (flag_trapping_math) | |
2251 | { | |
7206da1b | 2252 | /* Check that the original operation and the optimized ones will trap |
318a728f | 2253 | under the same condition. */ |
2254 | bool ltrap = (lcompcode & COMPCODE_UNORD) == 0 | |
2255 | && (lcompcode != COMPCODE_EQ) | |
2256 | && (lcompcode != COMPCODE_ORD); | |
2257 | bool rtrap = (rcompcode & COMPCODE_UNORD) == 0 | |
2258 | && (rcompcode != COMPCODE_EQ) | |
2259 | && (rcompcode != COMPCODE_ORD); | |
2260 | bool trap = (compcode & COMPCODE_UNORD) == 0 | |
2261 | && (compcode != COMPCODE_EQ) | |
2262 | && (compcode != COMPCODE_ORD); | |
2263 | ||
2264 | /* In a short-circuited boolean expression the LHS might be | |
2265 | such that the RHS, if evaluated, will never trap. For | |
2266 | example, in ORD (x, y) && (x < y), we evaluate the RHS only | |
2267 | if neither x nor y is NaN. (This is a mixed blessing: for | |
2268 | example, the expression above will never trap, hence | |
2269 | optimizing it to x < y would be invalid). */ | |
2270 | if ((code == TRUTH_ORIF_EXPR && (lcompcode & COMPCODE_UNORD)) | |
2271 | || (code == TRUTH_ANDIF_EXPR && !(lcompcode & COMPCODE_UNORD))) | |
2272 | rtrap = false; | |
2273 | ||
2274 | /* If the comparison was short-circuited, and only the RHS | |
2275 | trapped, we may now generate a spurious trap. */ | |
2276 | if (rtrap && !ltrap | |
2277 | && (code == TRUTH_ANDIF_EXPR || code == TRUTH_ORIF_EXPR)) | |
2278 | return NULL_TREE; | |
2279 | ||
2280 | /* If we changed the conditions that cause a trap, we lose. */ | |
2281 | if ((ltrap || rtrap) != trap) | |
2282 | return NULL_TREE; | |
2283 | } | |
2284 | ||
2285 | if (compcode == COMPCODE_TRUE) | |
20783f07 | 2286 | return constant_boolean_node (true, truth_type); |
318a728f | 2287 | else if (compcode == COMPCODE_FALSE) |
20783f07 | 2288 | return constant_boolean_node (false, truth_type); |
318a728f | 2289 | else |
2290 | return fold (build2 (compcode_to_comparison (compcode), | |
2291 | truth_type, ll_arg, lr_arg)); | |
2292 | } | |
2293 | ||
8b94828f | 2294 | /* Return nonzero if CODE is a tree code that represents a truth value. */ |
2295 | ||
2296 | static int | |
de1b648b | 2297 | truth_value_p (enum tree_code code) |
8b94828f | 2298 | { |
ce45a448 | 2299 | return (TREE_CODE_CLASS (code) == tcc_comparison |
8b94828f | 2300 | || code == TRUTH_AND_EXPR || code == TRUTH_ANDIF_EXPR |
2301 | || code == TRUTH_OR_EXPR || code == TRUTH_ORIF_EXPR | |
2302 | || code == TRUTH_XOR_EXPR || code == TRUTH_NOT_EXPR); | |
2303 | } | |
e233264a | 2304 | \f |
9e6f4cc9 | 2305 | /* Return nonzero if two operands (typically of the same tree node) |
2306 | are necessarily equal. If either argument has side-effects this | |
365db11e | 2307 | function returns zero. FLAGS modifies behavior as follows: |
9e6f4cc9 | 2308 | |
4ee9c684 | 2309 | If OEP_ONLY_CONST is set, only return nonzero for constants. |
11acc1df | 2310 | This function tests whether the operands are indistinguishable; |
2311 | it does not test whether they are equal using C's == operation. | |
2312 | The distinction is important for IEEE floating point, because | |
2313 | (1) -0.0 and 0.0 are distinguishable, but -0.0==0.0, and | |
9e6f4cc9 | 2314 | (2) two NaNs may be indistinguishable, but NaN!=NaN. |
2315 | ||
4ee9c684 | 2316 | If OEP_ONLY_CONST is unset, a VAR_DECL is considered equal to itself |
9e6f4cc9 | 2317 | even though it may hold multiple values during a function. |
2318 | This is because a GCC tree node guarantees that nothing else is | |
2319 | executed between the evaluation of its "operands" (which may often | |
2320 | be evaluated in arbitrary order). Hence if the operands themselves | |
2321 | don't side-effect, the VAR_DECLs, PARM_DECLs etc... must hold the | |
9b931277 | 2322 | same value in each operand/subexpression. Hence leaving OEP_ONLY_CONST |
2323 | unset means assuming isochronic (or instantaneous) tree equivalence. | |
2324 | Unless comparing arbitrary expression trees, such as from different | |
2325 | statements, this flag can usually be left unset. | |
4ee9c684 | 2326 | |
2327 | If OEP_PURE_SAME is set, then pure functions with identical arguments | |
2328 | are considered the same. It is used when the caller has other ways | |
2329 | to ensure that global memory is unchanged in between. */ | |
2bc77e10 | 2330 | |
2331 | int | |
4ee9c684 | 2332 | operand_equal_p (tree arg0, tree arg1, unsigned int flags) |
2bc77e10 | 2333 | { |
e715d92e | 2334 | /* If one is specified and the other isn't, they aren't equal and if |
2335 | neither is specified, they are. | |
2336 | ||
2337 | ??? This is temporary and is meant only to handle the cases of the | |
2338 | optional operands for COMPONENT_REF and ARRAY_REF. */ | |
2339 | if ((arg0 && !arg1) || (!arg0 && arg1)) | |
2340 | return 0; | |
2341 | else if (!arg0 && !arg1) | |
2342 | return 1; | |
78a8ed03 | 2343 | /* If either is ERROR_MARK, they aren't equal. */ |
e715d92e | 2344 | else if (TREE_CODE (arg0) == ERROR_MARK || TREE_CODE (arg1) == ERROR_MARK) |
78a8ed03 | 2345 | return 0; |
2346 | ||
2bc77e10 | 2347 | /* If both types don't have the same signedness, then we can't consider |
2348 | them equal. We must check this before the STRIP_NOPS calls | |
2349 | because they may change the signedness of the arguments. */ | |
78a8ed03 | 2350 | if (TYPE_UNSIGNED (TREE_TYPE (arg0)) != TYPE_UNSIGNED (TREE_TYPE (arg1))) |
2bc77e10 | 2351 | return 0; |
2352 | ||
2353 | STRIP_NOPS (arg0); | |
2354 | STRIP_NOPS (arg1); | |
2355 | ||
8faaadf1 | 2356 | if (TREE_CODE (arg0) != TREE_CODE (arg1) |
2357 | /* This is needed for conversions and for COMPONENT_REF. | |
2358 | Might as well play it safe and always test this. */ | |
6a4737bf | 2359 | || TREE_CODE (TREE_TYPE (arg0)) == ERROR_MARK |
2360 | || TREE_CODE (TREE_TYPE (arg1)) == ERROR_MARK | |
8faaadf1 | 2361 | || TYPE_MODE (TREE_TYPE (arg0)) != TYPE_MODE (TREE_TYPE (arg1))) |
2bc77e10 | 2362 | return 0; |
2363 | ||
8faaadf1 | 2364 | /* If ARG0 and ARG1 are the same SAVE_EXPR, they are necessarily equal. |
2365 | We don't care about side effects in that case because the SAVE_EXPR | |
2366 | takes care of that for us. In all other cases, two expressions are | |
2367 | equal if they have no side effects. If we have two identical | |
2368 | expressions with side effects that should be treated the same due | |
2369 | to the only side effects being identical SAVE_EXPR's, that will | |
2370 | be detected in the recursive calls below. */ | |
4ee9c684 | 2371 | if (arg0 == arg1 && ! (flags & OEP_ONLY_CONST) |
8faaadf1 | 2372 | && (TREE_CODE (arg0) == SAVE_EXPR |
2373 | || (! TREE_SIDE_EFFECTS (arg0) && ! TREE_SIDE_EFFECTS (arg1)))) | |
2bc77e10 | 2374 | return 1; |
2375 | ||
8faaadf1 | 2376 | /* Next handle constant cases, those for which we can return 1 even |
2377 | if ONLY_CONST is set. */ | |
2378 | if (TREE_CONSTANT (arg0) && TREE_CONSTANT (arg1)) | |
2379 | switch (TREE_CODE (arg0)) | |
2380 | { | |
2381 | case INTEGER_CST: | |
d3041b98 | 2382 | return (! TREE_CONSTANT_OVERFLOW (arg0) |
2383 | && ! TREE_CONSTANT_OVERFLOW (arg1) | |
a0c2c45b | 2384 | && tree_int_cst_equal (arg0, arg1)); |
8faaadf1 | 2385 | |
2386 | case REAL_CST: | |
d3041b98 | 2387 | return (! TREE_CONSTANT_OVERFLOW (arg0) |
2388 | && ! TREE_CONSTANT_OVERFLOW (arg1) | |
62aa7862 | 2389 | && REAL_VALUES_IDENTICAL (TREE_REAL_CST (arg0), |
2390 | TREE_REAL_CST (arg1))); | |
8faaadf1 | 2391 | |
886cfd4f | 2392 | case VECTOR_CST: |
2393 | { | |
2394 | tree v1, v2; | |
2395 | ||
2396 | if (TREE_CONSTANT_OVERFLOW (arg0) | |
2397 | || TREE_CONSTANT_OVERFLOW (arg1)) | |
2398 | return 0; | |
2399 | ||
2400 | v1 = TREE_VECTOR_CST_ELTS (arg0); | |
2401 | v2 = TREE_VECTOR_CST_ELTS (arg1); | |
2402 | while (v1 && v2) | |
2403 | { | |
11cb6006 | 2404 | if (!operand_equal_p (TREE_VALUE (v1), TREE_VALUE (v2), |
4ee9c684 | 2405 | flags)) |
886cfd4f | 2406 | return 0; |
2407 | v1 = TREE_CHAIN (v1); | |
2408 | v2 = TREE_CHAIN (v2); | |
2409 | } | |
2410 | ||
2411 | return 1; | |
2412 | } | |
2413 | ||
8faaadf1 | 2414 | case COMPLEX_CST: |
2415 | return (operand_equal_p (TREE_REALPART (arg0), TREE_REALPART (arg1), | |
4ee9c684 | 2416 | flags) |
8faaadf1 | 2417 | && operand_equal_p (TREE_IMAGPART (arg0), TREE_IMAGPART (arg1), |
4ee9c684 | 2418 | flags)); |
8faaadf1 | 2419 | |
2420 | case STRING_CST: | |
2421 | return (TREE_STRING_LENGTH (arg0) == TREE_STRING_LENGTH (arg1) | |
6b918462 | 2422 | && ! memcmp (TREE_STRING_POINTER (arg0), |
8faaadf1 | 2423 | TREE_STRING_POINTER (arg1), |
2424 | TREE_STRING_LENGTH (arg0))); | |
2425 | ||
2426 | case ADDR_EXPR: | |
2427 | return operand_equal_p (TREE_OPERAND (arg0, 0), TREE_OPERAND (arg1, 0), | |
2428 | 0); | |
0dbd1c74 | 2429 | default: |
2430 | break; | |
8faaadf1 | 2431 | } |
2bc77e10 | 2432 | |
4ee9c684 | 2433 | if (flags & OEP_ONLY_CONST) |
2bc77e10 | 2434 | return 0; |
2435 | ||
2bc77e10 | 2436 | switch (TREE_CODE_CLASS (TREE_CODE (arg0))) |
2437 | { | |
ce45a448 | 2438 | case tcc_unary: |
2bc77e10 | 2439 | /* Two conversions are equal only if signedness and modes match. */ |
e6546627 | 2440 | switch (TREE_CODE (arg0)) |
2441 | { | |
2442 | case NOP_EXPR: | |
2443 | case CONVERT_EXPR: | |
2444 | case FIX_CEIL_EXPR: | |
2445 | case FIX_TRUNC_EXPR: | |
2446 | case FIX_FLOOR_EXPR: | |
2447 | case FIX_ROUND_EXPR: | |
2448 | if (TYPE_UNSIGNED (TREE_TYPE (arg0)) | |
2449 | != TYPE_UNSIGNED (TREE_TYPE (arg1))) | |
2450 | return 0; | |
2451 | break; | |
2452 | default: | |
2453 | break; | |
2454 | } | |
2bc77e10 | 2455 | |
e715d92e | 2456 | return operand_equal_p (TREE_OPERAND (arg0, 0), |
2457 | TREE_OPERAND (arg1, 0), flags); | |
2bc77e10 | 2458 | |
ce45a448 | 2459 | case tcc_comparison: |
2460 | case tcc_binary: | |
e715d92e | 2461 | if (operand_equal_p (TREE_OPERAND (arg0, 0), |
2462 | TREE_OPERAND (arg1, 0), flags) | |
2463 | && operand_equal_p (TREE_OPERAND (arg0, 1), | |
2464 | TREE_OPERAND (arg1, 1), flags)) | |
8faaadf1 | 2465 | return 1; |
2466 | ||
2467 | /* For commutative ops, allow the other order. */ | |
21dff555 | 2468 | return (commutative_tree_code (TREE_CODE (arg0)) |
8faaadf1 | 2469 | && operand_equal_p (TREE_OPERAND (arg0, 0), |
4ee9c684 | 2470 | TREE_OPERAND (arg1, 1), flags) |
2bc77e10 | 2471 | && operand_equal_p (TREE_OPERAND (arg0, 1), |
4ee9c684 | 2472 | TREE_OPERAND (arg1, 0), flags)); |
2bc77e10 | 2473 | |
ce45a448 | 2474 | case tcc_reference: |
06506f5d | 2475 | /* If either of the pointer (or reference) expressions we are |
2476 | dereferencing contain a side effect, these cannot be equal. */ | |
dbc71562 | 2477 | if (TREE_SIDE_EFFECTS (arg0) |
2478 | || TREE_SIDE_EFFECTS (arg1)) | |
2479 | return 0; | |
2480 | ||
2bc77e10 | 2481 | switch (TREE_CODE (arg0)) |
2482 | { | |
2483 | case INDIRECT_REF: | |
b056d812 | 2484 | case ALIGN_INDIRECT_REF: |
2485 | case MISALIGNED_INDIRECT_REF: | |
b25de375 | 2486 | case REALPART_EXPR: |
2487 | case IMAGPART_EXPR: | |
e715d92e | 2488 | return operand_equal_p (TREE_OPERAND (arg0, 0), |
2489 | TREE_OPERAND (arg1, 0), flags); | |
2bc77e10 | 2490 | |
2bc77e10 | 2491 | case ARRAY_REF: |
ba04d9d5 | 2492 | case ARRAY_RANGE_REF: |
e715d92e | 2493 | return (operand_equal_p (TREE_OPERAND (arg0, 0), |
2494 | TREE_OPERAND (arg1, 0), flags) | |
2495 | && operand_equal_p (TREE_OPERAND (arg0, 1), | |
2496 | TREE_OPERAND (arg1, 1), flags) | |
2497 | && operand_equal_p (TREE_OPERAND (arg0, 2), | |
2498 | TREE_OPERAND (arg1, 2), flags) | |
2499 | && operand_equal_p (TREE_OPERAND (arg0, 3), | |
2500 | TREE_OPERAND (arg1, 3), flags)); | |
2501 | ||
6ab43650 | 2502 | |
2503 | case COMPONENT_REF: | |
e715d92e | 2504 | return (operand_equal_p (TREE_OPERAND (arg0, 0), |
2505 | TREE_OPERAND (arg1, 0), flags) | |
2506 | && operand_equal_p (TREE_OPERAND (arg0, 1), | |
2507 | TREE_OPERAND (arg1, 1), flags) | |
2508 | && operand_equal_p (TREE_OPERAND (arg0, 2), | |
2509 | TREE_OPERAND (arg1, 2), flags)); | |
2bc77e10 | 2510 | |
8d061c60 | 2511 | |
e715d92e | 2512 | case BIT_FIELD_REF: |
2513 | return (operand_equal_p (TREE_OPERAND (arg0, 0), | |
2514 | TREE_OPERAND (arg1, 0), flags) | |
2515 | && operand_equal_p (TREE_OPERAND (arg0, 1), | |
2516 | TREE_OPERAND (arg1, 1), flags) | |
2517 | && operand_equal_p (TREE_OPERAND (arg0, 2), | |
2518 | TREE_OPERAND (arg1, 2), flags)); | |
0dbd1c74 | 2519 | default: |
2520 | return 0; | |
2bc77e10 | 2521 | } |
1d322a97 | 2522 | |
ce45a448 | 2523 | case tcc_expression: |
564989a5 | 2524 | switch (TREE_CODE (arg0)) |
2525 | { | |
2526 | case ADDR_EXPR: | |
2527 | case TRUTH_NOT_EXPR: | |
e715d92e | 2528 | return operand_equal_p (TREE_OPERAND (arg0, 0), |
2529 | TREE_OPERAND (arg1, 0), flags); | |
564989a5 | 2530 | |
bd975dc2 | 2531 | case TRUTH_ANDIF_EXPR: |
2532 | case TRUTH_ORIF_EXPR: | |
e715d92e | 2533 | return operand_equal_p (TREE_OPERAND (arg0, 0), |
2534 | TREE_OPERAND (arg1, 0), flags) | |
2535 | && operand_equal_p (TREE_OPERAND (arg0, 1), | |
2536 | TREE_OPERAND (arg1, 1), flags); | |
bd975dc2 | 2537 | |
2538 | case TRUTH_AND_EXPR: | |
2539 | case TRUTH_OR_EXPR: | |
2540 | case TRUTH_XOR_EXPR: | |
2541 | return (operand_equal_p (TREE_OPERAND (arg0, 0), | |
e715d92e | 2542 | TREE_OPERAND (arg1, 0), flags) |
bd975dc2 | 2543 | && operand_equal_p (TREE_OPERAND (arg0, 1), |
e715d92e | 2544 | TREE_OPERAND (arg1, 1), flags)) |
2545 | || (operand_equal_p (TREE_OPERAND (arg0, 0), | |
2546 | TREE_OPERAND (arg1, 1), flags) | |
2547 | && operand_equal_p (TREE_OPERAND (arg0, 1), | |
2548 | TREE_OPERAND (arg1, 0), flags)); | |
bd975dc2 | 2549 | |
06506f5d | 2550 | case CALL_EXPR: |
2551 | /* If the CALL_EXPRs call different functions, then they | |
2552 | clearly can not be equal. */ | |
e715d92e | 2553 | if (! operand_equal_p (TREE_OPERAND (arg0, 0), |
2554 | TREE_OPERAND (arg1, 0), flags)) | |
06506f5d | 2555 | return 0; |
2556 | ||
4ee9c684 | 2557 | { |
2558 | unsigned int cef = call_expr_flags (arg0); | |
2559 | if (flags & OEP_PURE_SAME) | |
2560 | cef &= ECF_CONST | ECF_PURE; | |
2561 | else | |
2562 | cef &= ECF_CONST; | |
2563 | if (!cef) | |
2564 | return 0; | |
2565 | } | |
06506f5d | 2566 | |
2567 | /* Now see if all the arguments are the same. operand_equal_p | |
2568 | does not handle TREE_LIST, so we walk the operands here | |
2569 | feeding them to operand_equal_p. */ | |
2570 | arg0 = TREE_OPERAND (arg0, 1); | |
2571 | arg1 = TREE_OPERAND (arg1, 1); | |
2572 | while (arg0 && arg1) | |
2573 | { | |
4ee9c684 | 2574 | if (! operand_equal_p (TREE_VALUE (arg0), TREE_VALUE (arg1), |
2575 | flags)) | |
06506f5d | 2576 | return 0; |
2577 | ||
2578 | arg0 = TREE_CHAIN (arg0); | |
2579 | arg1 = TREE_CHAIN (arg1); | |
2580 | } | |
2581 | ||
2582 | /* If we get here and both argument lists are exhausted | |
2583 | then the CALL_EXPRs are equal. */ | |
2584 | return ! (arg0 || arg1); | |
2585 | ||
564989a5 | 2586 | default: |
2587 | return 0; | |
2588 | } | |
cc049fa3 | 2589 | |
ce45a448 | 2590 | case tcc_declaration: |
4ee9c684 | 2591 | /* Consider __builtin_sqrt equal to sqrt. */ |
2592 | return (TREE_CODE (arg0) == FUNCTION_DECL | |
2593 | && DECL_BUILT_IN (arg0) && DECL_BUILT_IN (arg1) | |
2594 | && DECL_BUILT_IN_CLASS (arg0) == DECL_BUILT_IN_CLASS (arg1) | |
2595 | && DECL_FUNCTION_CODE (arg0) == DECL_FUNCTION_CODE (arg1)); | |
06506f5d | 2596 | |
0dbd1c74 | 2597 | default: |
2598 | return 0; | |
2bc77e10 | 2599 | } |
2bc77e10 | 2600 | } |
e233264a | 2601 | \f |
2602 | /* Similar to operand_equal_p, but see if ARG0 might have been made by | |
cc049fa3 | 2603 | shorten_compare from ARG1 when ARG1 was being compared with OTHER. |
2bc77e10 | 2604 | |
2bc77e10 | 2605 | When in doubt, return 0. */ |
2606 | ||
cc049fa3 | 2607 | static int |
de1b648b | 2608 | operand_equal_for_comparison_p (tree arg0, tree arg1, tree other) |
2bc77e10 | 2609 | { |
e233264a | 2610 | int unsignedp1, unsignedpo; |
df7caa7b | 2611 | tree primarg0, primarg1, primother; |
02e7a332 | 2612 | unsigned int correct_width; |
2bc77e10 | 2613 | |
e233264a | 2614 | if (operand_equal_p (arg0, arg1, 0)) |
2bc77e10 | 2615 | return 1; |
2616 | ||
154e6f12 | 2617 | if (! INTEGRAL_TYPE_P (TREE_TYPE (arg0)) |
2618 | || ! INTEGRAL_TYPE_P (TREE_TYPE (arg1))) | |
2bc77e10 | 2619 | return 0; |
2620 | ||
df7caa7b | 2621 | /* Discard any conversions that don't change the modes of ARG0 and ARG1 |
2622 | and see if the inner values are the same. This removes any | |
2623 | signedness comparison, which doesn't matter here. */ | |
2624 | primarg0 = arg0, primarg1 = arg1; | |
cc049fa3 | 2625 | STRIP_NOPS (primarg0); |
2626 | STRIP_NOPS (primarg1); | |
df7caa7b | 2627 | if (operand_equal_p (primarg0, primarg1, 0)) |
2628 | return 1; | |
2629 | ||
e233264a | 2630 | /* Duplicate what shorten_compare does to ARG1 and see if that gives the |
2631 | actual comparison operand, ARG0. | |
2bc77e10 | 2632 | |
e233264a | 2633 | First throw away any conversions to wider types |
2bc77e10 | 2634 | already present in the operands. */ |
2bc77e10 | 2635 | |
e233264a | 2636 | primarg1 = get_narrower (arg1, &unsignedp1); |
2637 | primother = get_narrower (other, &unsignedpo); | |
2638 | ||
2639 | correct_width = TYPE_PRECISION (TREE_TYPE (arg1)); | |
2640 | if (unsignedp1 == unsignedpo | |
2641 | && TYPE_PRECISION (TREE_TYPE (primarg1)) < correct_width | |
2642 | && TYPE_PRECISION (TREE_TYPE (primother)) < correct_width) | |
2bc77e10 | 2643 | { |
e233264a | 2644 | tree type = TREE_TYPE (arg0); |
2bc77e10 | 2645 | |
2646 | /* Make sure shorter operand is extended the right way | |
2647 | to match the longer operand. */ | |
fa8b888f | 2648 | primarg1 = fold_convert (lang_hooks.types.signed_or_unsigned_type |
b30e3dbc | 2649 | (unsignedp1, TREE_TYPE (primarg1)), primarg1); |
2bc77e10 | 2650 | |
b30e3dbc | 2651 | if (operand_equal_p (arg0, fold_convert (type, primarg1), 0)) |
2bc77e10 | 2652 | return 1; |
2653 | } | |
2654 | ||
2655 | return 0; | |
2656 | } | |
2657 | \f | |
eb2f80f3 | 2658 | /* See if ARG is an expression that is either a comparison or is performing |
e233264a | 2659 | arithmetic on comparisons. The comparisons must only be comparing |
2660 | two different values, which will be stored in *CVAL1 and *CVAL2; if | |
6ef828f9 | 2661 | they are nonzero it means that some operands have already been found. |
e233264a | 2662 | No variables may be used anywhere else in the expression except in the |
d0314131 | 2663 | comparisons. If SAVE_P is true it means we removed a SAVE_EXPR around |
2664 | the expression and save_expr needs to be called with CVAL1 and CVAL2. | |
e233264a | 2665 | |
2666 | If this is true, return 1. Otherwise, return zero. */ | |
2667 | ||
2668 | static int | |
de1b648b | 2669 | twoval_comparison_p (tree arg, tree *cval1, tree *cval2, int *save_p) |
e233264a | 2670 | { |
2671 | enum tree_code code = TREE_CODE (arg); | |
ce45a448 | 2672 | enum tree_code_class class = TREE_CODE_CLASS (code); |
e233264a | 2673 | |
ce45a448 | 2674 | /* We can handle some of the tcc_expression cases here. */ |
2675 | if (class == tcc_expression && code == TRUTH_NOT_EXPR) | |
2676 | class = tcc_unary; | |
2677 | else if (class == tcc_expression | |
e233264a | 2678 | && (code == TRUTH_ANDIF_EXPR || code == TRUTH_ORIF_EXPR |
2679 | || code == COMPOUND_EXPR)) | |
ce45a448 | 2680 | class = tcc_binary; |
8be91fe5 | 2681 | |
ce45a448 | 2682 | else if (class == tcc_expression && code == SAVE_EXPR |
083a2b5e | 2683 | && ! TREE_SIDE_EFFECTS (TREE_OPERAND (arg, 0))) |
d0314131 | 2684 | { |
2685 | /* If we've already found a CVAL1 or CVAL2, this expression is | |
2686 | two complex to handle. */ | |
2687 | if (*cval1 || *cval2) | |
2688 | return 0; | |
2689 | ||
ce45a448 | 2690 | class = tcc_unary; |
d0314131 | 2691 | *save_p = 1; |
2692 | } | |
e233264a | 2693 | |
2694 | switch (class) | |
2695 | { | |
ce45a448 | 2696 | case tcc_unary: |
d0314131 | 2697 | return twoval_comparison_p (TREE_OPERAND (arg, 0), cval1, cval2, save_p); |
e233264a | 2698 | |
ce45a448 | 2699 | case tcc_binary: |
d0314131 | 2700 | return (twoval_comparison_p (TREE_OPERAND (arg, 0), cval1, cval2, save_p) |
2701 | && twoval_comparison_p (TREE_OPERAND (arg, 1), | |
2702 | cval1, cval2, save_p)); | |
e233264a | 2703 | |
ce45a448 | 2704 | case tcc_constant: |
e233264a | 2705 | return 1; |
2706 | ||
ce45a448 | 2707 | case tcc_expression: |
e233264a | 2708 | if (code == COND_EXPR) |
d0314131 | 2709 | return (twoval_comparison_p (TREE_OPERAND (arg, 0), |
2710 | cval1, cval2, save_p) | |
2711 | && twoval_comparison_p (TREE_OPERAND (arg, 1), | |
2712 | cval1, cval2, save_p) | |
e233264a | 2713 | && twoval_comparison_p (TREE_OPERAND (arg, 2), |
d0314131 | 2714 | cval1, cval2, save_p)); |
e233264a | 2715 | return 0; |
cc049fa3 | 2716 | |
ce45a448 | 2717 | case tcc_comparison: |
e233264a | 2718 | /* First see if we can handle the first operand, then the second. For |
2719 | the second operand, we know *CVAL1 can't be zero. It must be that | |
2720 | one side of the comparison is each of the values; test for the | |
2721 | case where this isn't true by failing if the two operands | |
2722 | are the same. */ | |
2723 | ||
2724 | if (operand_equal_p (TREE_OPERAND (arg, 0), | |
2725 | TREE_OPERAND (arg, 1), 0)) | |
2726 | return 0; | |
2727 | ||
2728 | if (*cval1 == 0) | |
2729 | *cval1 = TREE_OPERAND (arg, 0); | |
2730 | else if (operand_equal_p (*cval1, TREE_OPERAND (arg, 0), 0)) | |
2731 | ; | |
2732 | else if (*cval2 == 0) | |
2733 | *cval2 = TREE_OPERAND (arg, 0); | |
2734 | else if (operand_equal_p (*cval2, TREE_OPERAND (arg, 0), 0)) | |
2735 | ; | |
2736 | else | |
2737 | return 0; | |
2738 | ||
2739 | if (operand_equal_p (*cval1, TREE_OPERAND (arg, 1), 0)) | |
2740 | ; | |
2741 | else if (*cval2 == 0) | |
2742 | *cval2 = TREE_OPERAND (arg, 1); | |
2743 | else if (operand_equal_p (*cval2, TREE_OPERAND (arg, 1), 0)) | |
2744 | ; | |
2745 | else | |
2746 | return 0; | |
2747 | ||
2748 | return 1; | |
e233264a | 2749 | |
0dbd1c74 | 2750 | default: |
2751 | return 0; | |
2752 | } | |
e233264a | 2753 | } |
2754 | \f | |
2755 | /* ARG is a tree that is known to contain just arithmetic operations and | |
2756 | comparisons. Evaluate the operations in the tree substituting NEW0 for | |
eb2f80f3 | 2757 | any occurrence of OLD0 as an operand of a comparison and likewise for |
e233264a | 2758 | NEW1 and OLD1. */ |
2759 | ||
2760 | static tree | |
de1b648b | 2761 | eval_subst (tree arg, tree old0, tree new0, tree old1, tree new1) |
e233264a | 2762 | { |
2763 | tree type = TREE_TYPE (arg); | |
2764 | enum tree_code code = TREE_CODE (arg); | |
ce45a448 | 2765 | enum tree_code_class class = TREE_CODE_CLASS (code); |
e233264a | 2766 | |
ce45a448 | 2767 | /* We can handle some of the tcc_expression cases here. */ |
2768 | if (class == tcc_expression && code == TRUTH_NOT_EXPR) | |
2769 | class = tcc_unary; | |
2770 | else if (class == tcc_expression | |
e233264a | 2771 | && (code == TRUTH_ANDIF_EXPR || code == TRUTH_ORIF_EXPR)) |
ce45a448 | 2772 | class = tcc_binary; |
e233264a | 2773 | |
2774 | switch (class) | |
2775 | { | |
ce45a448 | 2776 | case tcc_unary: |
e233264a | 2777 | return fold (build1 (code, type, |
2778 | eval_subst (TREE_OPERAND (arg, 0), | |
2779 | old0, new0, old1, new1))); | |
2780 | ||
ce45a448 | 2781 | case tcc_binary: |
fd96eeef | 2782 | return fold (build2 (code, type, |
2783 | eval_subst (TREE_OPERAND (arg, 0), | |
2784 | old0, new0, old1, new1), | |
2785 | eval_subst (TREE_OPERAND (arg, 1), | |
2786 | old0, new0, old1, new1))); | |
e233264a | 2787 | |
ce45a448 | 2788 | case tcc_expression: |
e233264a | 2789 | switch (code) |
2790 | { | |
2791 | case SAVE_EXPR: | |
2792 | return eval_subst (TREE_OPERAND (arg, 0), old0, new0, old1, new1); | |
2793 | ||
2794 | case COMPOUND_EXPR: | |
2795 | return eval_subst (TREE_OPERAND (arg, 1), old0, new0, old1, new1); | |
2796 | ||
2797 | case COND_EXPR: | |
fd96eeef | 2798 | return fold (build3 (code, type, |
2799 | eval_subst (TREE_OPERAND (arg, 0), | |
2800 | old0, new0, old1, new1), | |
2801 | eval_subst (TREE_OPERAND (arg, 1), | |
2802 | old0, new0, old1, new1), | |
2803 | eval_subst (TREE_OPERAND (arg, 2), | |
2804 | old0, new0, old1, new1))); | |
0dbd1c74 | 2805 | default: |
2806 | break; | |
e233264a | 2807 | } |
b4b174c3 | 2808 | /* Fall through - ??? */ |
e233264a | 2809 | |
ce45a448 | 2810 | case tcc_comparison: |
e233264a | 2811 | { |
2812 | tree arg0 = TREE_OPERAND (arg, 0); | |
2813 | tree arg1 = TREE_OPERAND (arg, 1); | |
2814 | ||
2815 | /* We need to check both for exact equality and tree equality. The | |
2816 | former will be true if the operand has a side-effect. In that | |
2817 | case, we know the operand occurred exactly once. */ | |
2818 | ||
2819 | if (arg0 == old0 || operand_equal_p (arg0, old0, 0)) | |
2820 | arg0 = new0; | |
2821 | else if (arg0 == old1 || operand_equal_p (arg0, old1, 0)) | |
2822 | arg0 = new1; | |
2823 | ||
2824 | if (arg1 == old0 || operand_equal_p (arg1, old0, 0)) | |
2825 | arg1 = new0; | |
2826 | else if (arg1 == old1 || operand_equal_p (arg1, old1, 0)) | |
2827 | arg1 = new1; | |
2828 | ||
fd96eeef | 2829 | return fold (build2 (code, type, arg0, arg1)); |
e233264a | 2830 | } |
e233264a | 2831 | |
0dbd1c74 | 2832 | default: |
2833 | return arg; | |
2834 | } | |
e233264a | 2835 | } |
2836 | \f | |
2bc77e10 | 2837 | /* Return a tree for the case when the result of an expression is RESULT |
2838 | converted to TYPE and OMITTED was previously an operand of the expression | |
2839 | but is now not needed (e.g., we folded OMITTED * 0). | |
2840 | ||
2841 | If OMITTED has side effects, we must evaluate it. Otherwise, just do | |
2842 | the conversion of RESULT to TYPE. */ | |
2843 | ||
e9f80ff5 | 2844 | tree |
de1b648b | 2845 | omit_one_operand (tree type, tree result, tree omitted) |
2bc77e10 | 2846 | { |
b30e3dbc | 2847 | tree t = fold_convert (type, result); |
2bc77e10 | 2848 | |
2849 | if (TREE_SIDE_EFFECTS (omitted)) | |
db97ad41 | 2850 | return build2 (COMPOUND_EXPR, type, fold_ignored_result (omitted), t); |
2bc77e10 | 2851 | |
c3ce5d04 | 2852 | return non_lvalue (t); |
2bc77e10 | 2853 | } |
6df5edfa | 2854 | |
2855 | /* Similar, but call pedantic_non_lvalue instead of non_lvalue. */ | |
2856 | ||
2857 | static tree | |
de1b648b | 2858 | pedantic_omit_one_operand (tree type, tree result, tree omitted) |
6df5edfa | 2859 | { |
b30e3dbc | 2860 | tree t = fold_convert (type, result); |
6df5edfa | 2861 | |
2862 | if (TREE_SIDE_EFFECTS (omitted)) | |
db97ad41 | 2863 | return build2 (COMPOUND_EXPR, type, fold_ignored_result (omitted), t); |
6df5edfa | 2864 | |
2865 | return pedantic_non_lvalue (t); | |
2866 | } | |
9bc9f15f | 2867 | |
2868 | /* Return a tree for the case when the result of an expression is RESULT | |
2869 | converted to TYPE and OMITTED1 and OMITTED2 were previously operands | |
2870 | of the expression but are now not needed. | |
2871 | ||
2872 | If OMITTED1 or OMITTED2 has side effects, they must be evaluated. | |
2873 | If both OMITTED1 and OMITTED2 have side effects, OMITTED1 is | |
2874 | evaluated before OMITTED2. Otherwise, if neither has side effects, | |
2875 | just do the conversion of RESULT to TYPE. */ | |
2876 | ||
2877 | tree | |
2878 | omit_two_operands (tree type, tree result, tree omitted1, tree omitted2) | |
2879 | { | |
2880 | tree t = fold_convert (type, result); | |
2881 | ||
2882 | if (TREE_SIDE_EFFECTS (omitted2)) | |
2883 | t = build2 (COMPOUND_EXPR, type, omitted2, t); | |
2884 | if (TREE_SIDE_EFFECTS (omitted1)) | |
2885 | t = build2 (COMPOUND_EXPR, type, omitted1, t); | |
2886 | ||
2887 | return TREE_CODE (t) != COMPOUND_EXPR ? non_lvalue (t) : t; | |
2888 | } | |
2889 | ||
2bc77e10 | 2890 | \f |
46b0e007 | 2891 | /* Return a simplified tree node for the truth-negation of ARG. This |
2892 | never alters ARG itself. We assume that ARG is an operation that | |
318a728f | 2893 | returns a truth value (0 or 1). |
2bc77e10 | 2894 | |
318a728f | 2895 | FIXME: one would think we would fold the result, but it causes |
2896 | problems with the dominator optimizer. */ | |
2bc77e10 | 2897 | tree |
de1b648b | 2898 | invert_truthvalue (tree arg) |
2bc77e10 | 2899 | { |
2900 | tree type = TREE_TYPE (arg); | |
e233264a | 2901 | enum tree_code code = TREE_CODE (arg); |
2bc77e10 | 2902 | |
c34cc7e5 | 2903 | if (code == ERROR_MARK) |
2904 | return arg; | |
2905 | ||
e233264a | 2906 | /* If this is a comparison, we can simply invert it, except for |
2907 | floating-point non-equality comparisons, in which case we just | |
2908 | enclose a TRUTH_NOT_EXPR around what we have. */ | |
2bc77e10 | 2909 | |
ce45a448 | 2910 | if (TREE_CODE_CLASS (code) == tcc_comparison) |
2bc77e10 | 2911 | { |
318a728f | 2912 | tree op_type = TREE_TYPE (TREE_OPERAND (arg, 0)); |
2913 | if (FLOAT_TYPE_P (op_type) | |
2914 | && flag_trapping_math | |
2915 | && code != ORDERED_EXPR && code != UNORDERED_EXPR | |
2916 | && code != NE_EXPR && code != EQ_EXPR) | |
5f03fd61 | 2917 | return build1 (TRUTH_NOT_EXPR, type, arg); |
e233264a | 2918 | else |
318a728f | 2919 | { |
2920 | code = invert_tree_comparison (code, | |
2921 | HONOR_NANS (TYPE_MODE (op_type))); | |
2922 | if (code == ERROR_MARK) | |
2923 | return build1 (TRUTH_NOT_EXPR, type, arg); | |
2924 | else | |
2925 | return build2 (code, type, | |
2926 | TREE_OPERAND (arg, 0), TREE_OPERAND (arg, 1)); | |
2927 | } | |
e233264a | 2928 | } |
2bc77e10 | 2929 | |
e233264a | 2930 | switch (code) |
2931 | { | |
2bc77e10 | 2932 | case INTEGER_CST: |
7c446c95 | 2933 | return fold_convert (type, |
7016c612 | 2934 | build_int_cst (NULL_TREE, integer_zerop (arg))); |
2bc77e10 | 2935 | |
2936 | case TRUTH_AND_EXPR: | |
fd96eeef | 2937 | return build2 (TRUTH_OR_EXPR, type, |
2938 | invert_truthvalue (TREE_OPERAND (arg, 0)), | |
2939 | invert_truthvalue (TREE_OPERAND (arg, 1))); | |
2bc77e10 | 2940 | |
2941 | case TRUTH_OR_EXPR: | |
fd96eeef | 2942 | return build2 (TRUTH_AND_EXPR, type, |
2943 | invert_truthvalue (TREE_OPERAND (arg, 0)), | |
2944 | invert_truthvalue (TREE_OPERAND (arg, 1))); | |
2bc77e10 | 2945 | |
9a7b73a1 | 2946 | case TRUTH_XOR_EXPR: |
2947 | /* Here we can invert either operand. We invert the first operand | |
2948 | unless the second operand is a TRUTH_NOT_EXPR in which case our | |
2949 | result is the XOR of the first operand with the inside of the | |
2950 | negation of the second operand. */ | |
2951 | ||
2952 | if (TREE_CODE (TREE_OPERAND (arg, 1)) == TRUTH_NOT_EXPR) | |
fd96eeef | 2953 | return build2 (TRUTH_XOR_EXPR, type, TREE_OPERAND (arg, 0), |
2954 | TREE_OPERAND (TREE_OPERAND (arg, 1), 0)); | |
9a7b73a1 | 2955 | else |
fd96eeef | 2956 | return build2 (TRUTH_XOR_EXPR, type, |
2957 | invert_truthvalue (TREE_OPERAND (arg, 0)), | |
2958 | TREE_OPERAND (arg, 1)); | |
9a7b73a1 | 2959 | |
2bc77e10 | 2960 | case TRUTH_ANDIF_EXPR: |
fd96eeef | 2961 | return build2 (TRUTH_ORIF_EXPR, type, |
2962 | invert_truthvalue (TREE_OPERAND (arg, 0)), | |
2963 | invert_truthvalue (TREE_OPERAND (arg, 1))); | |
2bc77e10 | 2964 | |
2965 | case TRUTH_ORIF_EXPR: | |
fd96eeef | 2966 | return build2 (TRUTH_ANDIF_EXPR, type, |
2967 | invert_truthvalue (TREE_OPERAND (arg, 0)), | |
2968 | invert_truthvalue (TREE_OPERAND (arg, 1))); | |
2bc77e10 | 2969 | |
2970 | case TRUTH_NOT_EXPR: | |
2971 | return TREE_OPERAND (arg, 0); | |
2972 | ||
2973 | case COND_EXPR: | |
fd96eeef | 2974 | return build3 (COND_EXPR, type, TREE_OPERAND (arg, 0), |
2975 | invert_truthvalue (TREE_OPERAND (arg, 1)), | |
2976 | invert_truthvalue (TREE_OPERAND (arg, 2))); | |
2bc77e10 | 2977 | |
3139f3ce | 2978 | case COMPOUND_EXPR: |
fd96eeef | 2979 | return build2 (COMPOUND_EXPR, type, TREE_OPERAND (arg, 0), |
2980 | invert_truthvalue (TREE_OPERAND (arg, 1))); | |
3139f3ce | 2981 | |
2bc77e10 | 2982 | case NON_LVALUE_EXPR: |
2983 | return invert_truthvalue (TREE_OPERAND (arg, 0)); | |
2984 | ||
2985 | case NOP_EXPR: | |
4ee9c684 | 2986 | if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE) |
2987 | break; | |
2988 | ||
2bc77e10 | 2989 | case CONVERT_EXPR: |
2990 | case FLOAT_EXPR: | |
2991 | return build1 (TREE_CODE (arg), type, | |
2992 | invert_truthvalue (TREE_OPERAND (arg, 0))); | |
2993 | ||
2994 | case BIT_AND_EXPR: | |
c35387e1 | 2995 | if (!integer_onep (TREE_OPERAND (arg, 1))) |
2996 | break; | |
fd96eeef | 2997 | return build2 (EQ_EXPR, type, arg, |
2998 | fold_convert (type, integer_zero_node)); | |
2bc77e10 | 2999 | |
468d693c | 3000 | case SAVE_EXPR: |
3001 | return build1 (TRUTH_NOT_EXPR, type, arg); | |
f33c3a83 | 3002 | |
3003 | case CLEANUP_POINT_EXPR: | |
3004 | return build1 (CLEANUP_POINT_EXPR, type, | |
3005 | invert_truthvalue (TREE_OPERAND (arg, 0))); | |
0dbd1c74 | 3006 | |
3007 | default: | |
3008 | break; | |
c35387e1 | 3009 | } |
fdada98f | 3010 | gcc_assert (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE); |
c35387e1 | 3011 | return build1 (TRUTH_NOT_EXPR, type, arg); |
2bc77e10 | 3012 | } |
3013 | ||
3014 | /* Given a bit-wise operation CODE applied to ARG0 and ARG1, see if both | |
3015 | operands are another bit-wise operation with a common input. If so, | |
3016 | distribute the bit operations to save an operation and possibly two if | |
3017 | constants are involved. For example, convert | |
de1b648b | 3018 | (A | B) & (A | C) into A | (B & C) |
2bc77e10 | 3019 | Further simplification will occur if B and C are constants. |
3020 | ||
3021 | If this optimization cannot be done, 0 will be returned. */ | |
3022 | ||
3023 | static tree | |
de1b648b | 3024 | distribute_bit_expr (enum tree_code code, tree type, tree arg0, tree arg1) |
2bc77e10 | 3025 | { |
3026 | tree common; | |
3027 | tree left, right; | |
3028 | ||
3029 | if (TREE_CODE (arg0) != TREE_CODE (arg1) | |
3030 | || TREE_CODE (arg0) == code | |
5b1de181 | 3031 | || (TREE_CODE (arg0) != BIT_AND_EXPR |
3032 | && TREE_CODE (arg0) != BIT_IOR_EXPR)) | |
2bc77e10 | 3033 | return 0; |
3034 | ||
3035 | if (operand_equal_p (TREE_OPERAND (arg0, 0), TREE_OPERAND (arg1, 0), 0)) | |
3036 | { | |
3037 | common = TREE_OPERAND (arg0, 0); | |
3038 | left = TREE_OPERAND (arg0, 1); | |
3039 | right = TREE_OPERAND (arg1, 1); | |
3040 | } | |
3041 | else if (operand_equal_p (TREE_OPERAND (arg0, 0), TREE_OPERAND (arg1, 1), 0)) | |
3042 | { | |
3043 | common = TREE_OPERAND (arg0, 0); | |
3044 | left = TREE_OPERAND (arg0, 1); | |
3045 | right = TREE_OPERAND (arg1, 0); | |
3046 | } | |
3047 | else if (operand_equal_p (TREE_OPERAND (arg0, 1), TREE_OPERAND (arg1, 0), 0)) | |
3048 | { | |
3049 | common = TREE_OPERAND (arg0, 1); | |
3050 | left = TREE_OPERAND (arg0, 0); | |
3051 | right = TREE_OPERAND (arg1, 1); | |
3052 | } | |
3053 | else if (operand_equal_p (TREE_OPERAND (arg0, 1), TREE_OPERAND (arg1, 1), 0)) | |
3054 | { | |
3055 | common = TREE_OPERAND (arg0, 1); | |
3056 | left = TREE_OPERAND (arg0, 0); | |
3057 | right = TREE_OPERAND (arg1, 0); | |
3058 | } | |
3059 | else | |
3060 | return 0; | |
3061 | ||
fd96eeef | 3062 | return fold (build2 (TREE_CODE (arg0), type, common, |
3063 | fold (build2 (code, type, left, right)))); | |
2bc77e10 | 3064 | } |
3065 | \f | |
3066 | /* Return a BIT_FIELD_REF of type TYPE to refer to BITSIZE bits of INNER | |
6ef828f9 | 3067 | starting at BITPOS. The field is unsigned if UNSIGNEDP is nonzero. */ |
2bc77e10 | 3068 | |
3069 | static tree | |
dc81944a | 3070 | make_bit_field_ref (tree inner, tree type, int bitsize, int bitpos, |
3071 | int unsignedp) | |
2bc77e10 | 3072 | { |
fd96eeef | 3073 | tree result = build3 (BIT_FIELD_REF, type, inner, |
3074 | size_int (bitsize), bitsize_int (bitpos)); | |
2bc77e10 | 3075 | |
86ae60fd | 3076 | BIT_FIELD_REF_UNSIGNED (result) = unsignedp; |
2bc77e10 | 3077 | |
3078 | return result; | |
3079 | } | |
3080 | ||
3081 | /* Optimize a bit-field compare. | |
3082 | ||
3083 | There are two cases: First is a compare against a constant and the | |
3084 | second is a comparison of two items where the fields are at the same | |
3085 | bit position relative to the start of a chunk (byte, halfword, word) | |
3086 | large enough to contain it. In these cases we can avoid the shift | |
3087 | implicit in bitfield extractions. | |
3088 | ||
3089 | For constants, we emit a compare of the shifted constant with the | |
3090 | BIT_AND_EXPR of a mask and a byte, halfword, or word of the operand being | |
3091 | compared. For two fields at the same position, we do the ANDs with the | |
3092 | similar mask and compare the result of the ANDs. | |
3093 | ||
3094 | CODE is the comparison code, known to be either NE_EXPR or EQ_EXPR. | |
3095 | COMPARE_TYPE is the type of the comparison, and LHS and RHS | |
3096 | are the left and right operands of the comparison, respectively. | |
3097 | ||
4bbea254 | 3098 | If the optimization described above can be done, we return the resulting |
2bc77e10 | 3099 | tree. Otherwise we return zero. */ |
3100 | ||
3101 | static tree | |
dc81944a | 3102 | optimize_bit_field_compare (enum tree_code code, tree compare_type, |
3103 | tree lhs, tree rhs) | |
2bc77e10 | 3104 | { |
02e7a332 | 3105 | HOST_WIDE_INT lbitpos, lbitsize, rbitpos, rbitsize, nbitpos, nbitsize; |
2bc77e10 | 3106 | tree type = TREE_TYPE (lhs); |
3107 | tree signed_type, unsigned_type; | |
3108 | int const_p = TREE_CODE (rhs) == INTEGER_CST; | |
4d1060a2 | 3109 | enum machine_mode lmode, rmode, nmode; |
2bc77e10 | 3110 | int lunsignedp, runsignedp; |
3111 | int lvolatilep = 0, rvolatilep = 0; | |
93b6a460 | 3112 | tree linner, rinner = NULL_TREE; |
2bc77e10 | 3113 | tree mask; |
bbfbdece | 3114 | tree offset; |
2bc77e10 | 3115 | |
3116 | /* Get all the information about the extractions being done. If the bit size | |
3117 | if the same as the size of the underlying object, we aren't doing an | |
155b05dc | 3118 | extraction at all and so can do nothing. We also don't want to |
3119 | do anything if the inner expression is a PLACEHOLDER_EXPR since we | |
3120 | then will no longer be able to replace it. */ | |
bbfbdece | 3121 | linner = get_inner_reference (lhs, &lbitsize, &lbitpos, &offset, &lmode, |
2b96c5f6 | 3122 | &lunsignedp, &lvolatilep); |
f73497ef | 3123 | if (linner == lhs || lbitsize == GET_MODE_BITSIZE (lmode) || lbitsize < 0 |
155b05dc | 3124 | || offset != 0 || TREE_CODE (linner) == PLACEHOLDER_EXPR) |
2bc77e10 | 3125 | return 0; |
3126 | ||
3127 | if (!const_p) | |
3128 | { | |
3129 | /* If this is not a constant, we can only do something if bit positions, | |
1e625a2e | 3130 | sizes, and signedness are the same. */ |
417d3458 | 3131 | rinner = get_inner_reference (rhs, &rbitsize, &rbitpos, &offset, &rmode, |
2b96c5f6 | 3132 | &runsignedp, &rvolatilep); |
2bc77e10 | 3133 | |
f73497ef | 3134 | if (rinner == rhs || lbitpos != rbitpos || lbitsize != rbitsize |
155b05dc | 3135 | || lunsignedp != runsignedp || offset != 0 |
3136 | || TREE_CODE (rinner) == PLACEHOLDER_EXPR) | |
2bc77e10 | 3137 | return 0; |
3138 | } | |
3139 | ||
3140 | /* See if we can find a mode to refer to this field. We should be able to, | |
3141 | but fail if we can't. */ | |
4d1060a2 | 3142 | nmode = get_best_mode (lbitsize, lbitpos, |
3143 | const_p ? TYPE_ALIGN (TREE_TYPE (linner)) | |
3144 | : MIN (TYPE_ALIGN (TREE_TYPE (linner)), | |
3145 | TYPE_ALIGN (TREE_TYPE (rinner))), | |
3146 | word_mode, lvolatilep || rvolatilep); | |
3147 | if (nmode == VOIDmode) | |
2bc77e10 | 3148 | return 0; |
3149 | ||
3150 | /* Set signed and unsigned types of the precision of this mode for the | |
3151 | shifts below. */ | |
fa8b888f | 3152 | signed_type = lang_hooks.types.type_for_mode (nmode, 0); |
3153 | unsigned_type = lang_hooks.types.type_for_mode (nmode, 1); | |
2bc77e10 | 3154 | |
2bc77e10 | 3155 | /* Compute the bit position and size for the new reference and our offset |
3156 | within it. If the new reference is the same size as the original, we | |
3157 | won't optimize anything, so return zero. */ | |
4d1060a2 | 3158 | nbitsize = GET_MODE_BITSIZE (nmode); |
3159 | nbitpos = lbitpos & ~ (nbitsize - 1); | |
3160 | lbitpos -= nbitpos; | |
3161 | if (nbitsize == lbitsize) | |
2bc77e10 | 3162 | return 0; |
3163 | ||
51356f86 | 3164 | if (BYTES_BIG_ENDIAN) |
4d1060a2 | 3165 | lbitpos = nbitsize - lbitsize - lbitpos; |
2bc77e10 | 3166 | |
3167 | /* Make the mask to be used against the extracted field. */ | |
7016c612 | 3168 | mask = build_int_cst (unsigned_type, -1); |
4d28c5d1 | 3169 | mask = force_fit_type (mask, 0, false, false); |
b30e3dbc | 3170 | mask = fold_convert (unsigned_type, mask); |
4d1060a2 | 3171 | mask = const_binop (LSHIFT_EXPR, mask, size_int (nbitsize - lbitsize), 0); |
2bc77e10 | 3172 | mask = const_binop (RSHIFT_EXPR, mask, |
4d1060a2 | 3173 | size_int (nbitsize - lbitsize - lbitpos), 0); |
2bc77e10 | 3174 | |
3175 | if (! const_p) | |
3176 | /* If not comparing with constant, just rework the comparison | |
3177 | and return. */ | |
fd96eeef | 3178 | return build2 (code, compare_type, |
3179 | build2 (BIT_AND_EXPR, unsigned_type, | |
3180 | make_bit_field_ref (linner, unsigned_type, | |
3181 | nbitsize, nbitpos, 1), | |
3182 | mask), | |
3183 | build2 (BIT_AND_EXPR, unsigned_type, | |
3184 | make_bit_field_ref (rinner, unsigned_type, | |
3185 | nbitsize, nbitpos, 1), | |
3186 | mask)); | |
2bc77e10 | 3187 | |
3188 | /* Otherwise, we are handling the constant case. See if the constant is too | |
3189 | big for the field. Warn and return a tree of for 0 (false) if so. We do | |
3190 | this not only for its own sake, but to avoid having to test for this | |
3191 | error case below. If we didn't, we might generate wrong code. | |
3192 | ||
3193 | For unsigned fields, the constant shifted right by the field length should | |
cc049fa3 | 3194 | be all zero. For signed fields, the high-order bits should agree with |
2bc77e10 | 3195 | the sign bit. */ |
3196 | ||
3197 | if (lunsignedp) | |
3198 | { | |
3199 | if (! integer_zerop (const_binop (RSHIFT_EXPR, | |
b30e3dbc | 3200 | fold_convert (unsigned_type, rhs), |
5485823f | 3201 | size_int (lbitsize), 0))) |
2bc77e10 | 3202 | { |
f4ec69cb | 3203 | warning ("comparison is always %d due to width of bit-field", |
be2828ce | 3204 | code == NE_EXPR); |
20783f07 | 3205 | return constant_boolean_node (code == NE_EXPR, compare_type); |
2bc77e10 | 3206 | } |
3207 | } | |
3208 | else | |
3209 | { | |
b30e3dbc | 3210 | tree tem = const_binop (RSHIFT_EXPR, fold_convert (signed_type, rhs), |
5485823f | 3211 | size_int (lbitsize - 1), 0); |
2bc77e10 | 3212 | if (! integer_zerop (tem) && ! integer_all_onesp (tem)) |
3213 | { | |
f4ec69cb | 3214 | warning ("comparison is always %d due to width of bit-field", |
be2828ce | 3215 | code == NE_EXPR); |
20783f07 | 3216 | return constant_boolean_node (code == NE_EXPR, compare_type); |
2bc77e10 | 3217 | } |
3218 | } | |
3219 | ||
3220 | /* Single-bit compares should always be against zero. */ | |
3221 | if (lbitsize == 1 && ! integer_zerop (rhs)) | |
3222 | { | |
3223 | code = code == EQ_EXPR ? NE_EXPR : EQ_EXPR; | |
b30e3dbc | 3224 | rhs = fold_convert (type, integer_zero_node); |
2bc77e10 | 3225 | } |
3226 | ||
3227 | /* Make a new bitfield reference, shift the constant over the | |
3228 | appropriate number of bits and mask it with the computed mask | |
3229 | (in case this was a signed field). If we changed it, make a new one. */ | |
4d1060a2 | 3230 | lhs = make_bit_field_ref (linner, unsigned_type, nbitsize, nbitpos, 1); |
e03ab35e | 3231 | if (lvolatilep) |
3232 | { | |
3233 | TREE_SIDE_EFFECTS (lhs) = 1; | |
3234 | TREE_THIS_VOLATILE (lhs) = 1; | |
3235 | } | |
2bc77e10 | 3236 | |
66716a97 | 3237 | rhs = fold (const_binop (BIT_AND_EXPR, |
3238 | const_binop (LSHIFT_EXPR, | |
b30e3dbc | 3239 | fold_convert (unsigned_type, rhs), |
eb8ae79c | 3240 | size_int (lbitpos), 0), |
5485823f | 3241 | mask, 0)); |
2bc77e10 | 3242 | |
fd96eeef | 3243 | return build2 (code, compare_type, |
3244 | build2 (BIT_AND_EXPR, unsigned_type, lhs, mask), | |
3245 | rhs); | |
2bc77e10 | 3246 | } |
3247 | \f | |
79109eec | 3248 | /* Subroutine for fold_truthop: decode a field reference. |
2bc77e10 | 3249 | |
3250 | If EXP is a comparison reference, we return the innermost reference. | |
3251 | ||
3252 | *PBITSIZE is set to the number of bits in the reference, *PBITPOS is | |
3253 | set to the starting bit number. | |
3254 | ||
3255 | If the innermost field can be completely contained in a mode-sized | |
3256 | unit, *PMODE is set to that mode. Otherwise, it is set to VOIDmode. | |
3257 | ||
3258 | *PVOLATILEP is set to 1 if the any expression encountered is volatile; | |
3259 | otherwise it is not changed. | |
3260 | ||
3261 | *PUNSIGNEDP is set to the signedness of the field. | |
3262 | ||
3263 | *PMASK is set to the mask used. This is either contained in a | |
3264 | BIT_AND_EXPR or derived from the width of the field. | |
3265 | ||
3398e91d | 3266 | *PAND_MASK is set to the mask found in a BIT_AND_EXPR, if any. |
2a6329ae | 3267 | |
2bc77e10 | 3268 | Return 0 if this is not a component reference or is one that we can't |
3269 | do anything with. */ | |
3270 | ||
3271 | static tree | |
dc81944a | 3272 | decode_field_reference (tree exp, HOST_WIDE_INT *pbitsize, |
3273 | HOST_WIDE_INT *pbitpos, enum machine_mode *pmode, | |
3274 | int *punsignedp, int *pvolatilep, | |
de1b648b | 3275 | tree *pmask, tree *pand_mask) |
2bc77e10 | 3276 | { |
74878f86 | 3277 | tree outer_type = 0; |
4843fe7c | 3278 | tree and_mask = 0; |
3279 | tree mask, inner, offset; | |
3280 | tree unsigned_type; | |
02e7a332 | 3281 | unsigned int precision; |
2bc77e10 | 3282 | |
cc049fa3 | 3283 | /* All the optimizations using this function assume integer fields. |
e40566fc | 3284 | There are problems with FP fields since the type_for_size call |
3285 | below can fail for, e.g., XFmode. */ | |
3286 | if (! INTEGRAL_TYPE_P (TREE_TYPE (exp))) | |
3287 | return 0; | |
3288 | ||
74878f86 | 3289 | /* We are interested in the bare arrangement of bits, so strip everything |
3290 | that doesn't affect the machine mode. However, record the type of the | |
3291 | outermost expression if it may matter below. */ | |
3292 | if (TREE_CODE (exp) == NOP_EXPR | |
3293 | || TREE_CODE (exp) == CONVERT_EXPR | |
3294 | || TREE_CODE (exp) == NON_LVALUE_EXPR) | |
3295 | outer_type = TREE_TYPE (exp); | |
78379bd9 | 3296 | STRIP_NOPS (exp); |
2bc77e10 | 3297 | |
3298 | if (TREE_CODE (exp) == BIT_AND_EXPR) | |
3299 | { | |
4843fe7c | 3300 | and_mask = TREE_OPERAND (exp, 1); |
2bc77e10 | 3301 | exp = TREE_OPERAND (exp, 0); |
4843fe7c | 3302 | STRIP_NOPS (exp); STRIP_NOPS (and_mask); |
3303 | if (TREE_CODE (and_mask) != INTEGER_CST) | |
2bc77e10 | 3304 | return 0; |
3305 | } | |
3306 | ||
bbfbdece | 3307 | inner = get_inner_reference (exp, pbitsize, pbitpos, &offset, pmode, |
2b96c5f6 | 3308 | punsignedp, pvolatilep); |
94f29e88 | 3309 | if ((inner == exp && and_mask == 0) |
155b05dc | 3310 | || *pbitsize < 0 || offset != 0 |
3311 | || TREE_CODE (inner) == PLACEHOLDER_EXPR) | |
e233264a | 3312 | return 0; |
cc049fa3 | 3313 | |
74878f86 | 3314 | /* If the number of bits in the reference is the same as the bitsize of |
3315 | the outer type, then the outer type gives the signedness. Otherwise | |
3316 | (in case of a small bitfield) the signedness is unchanged. */ | |
18dbec6f | 3317 | if (outer_type && *pbitsize == TYPE_PRECISION (outer_type)) |
78a8ed03 | 3318 | *punsignedp = TYPE_UNSIGNED (outer_type); |
74878f86 | 3319 | |
4843fe7c | 3320 | /* Compute the mask to access the bitfield. */ |
fa8b888f | 3321 | unsigned_type = lang_hooks.types.type_for_size (*pbitsize, 1); |
4843fe7c | 3322 | precision = TYPE_PRECISION (unsigned_type); |
3323 | ||
7016c612 | 3324 | mask = build_int_cst (unsigned_type, -1); |
4d28c5d1 | 3325 | mask = force_fit_type (mask, 0, false, false); |
0c5713a2 | 3326 | |
4843fe7c | 3327 | mask = const_binop (LSHIFT_EXPR, mask, size_int (precision - *pbitsize), 0); |
3328 | mask = const_binop (RSHIFT_EXPR, mask, size_int (precision - *pbitsize), 0); | |
3329 | ||
3330 | /* Merge it with the mask we found in the BIT_AND_EXPR, if any. */ | |
3331 | if (and_mask != 0) | |
fd96eeef | 3332 | mask = fold (build2 (BIT_AND_EXPR, unsigned_type, |
3333 | fold_convert (unsigned_type, and_mask), mask)); | |
2bc77e10 | 3334 | |
3335 | *pmask = mask; | |
2a6329ae | 3336 | *pand_mask = and_mask; |
2bc77e10 | 3337 | return inner; |
3338 | } | |
3339 | ||
6ef828f9 | 3340 | /* Return nonzero if MASK represents a mask of SIZE ones in the low-order |
2bc77e10 | 3341 | bit positions. */ |
3342 | ||
3343 | static int | |
de1b648b | 3344 | all_ones_mask_p (tree mask, int size) |
2bc77e10 | 3345 | { |
3346 | tree type = TREE_TYPE (mask); | |
02e7a332 | 3347 | unsigned int precision = TYPE_PRECISION (type); |
52a49c7c | 3348 | tree tmask; |
2bc77e10 | 3349 | |
7016c612 | 3350 | tmask = build_int_cst (lang_hooks.types.signed_type (type), -1); |
4d28c5d1 | 3351 | tmask = force_fit_type (tmask, 0, false, false); |
0c5713a2 | 3352 | |
2bc77e10 | 3353 | return |
cc049fa3 | 3354 | tree_int_cst_equal (mask, |
94f29e88 | 3355 | const_binop (RSHIFT_EXPR, |
3356 | const_binop (LSHIFT_EXPR, tmask, | |
3357 | size_int (precision - size), | |
3358 | 0), | |
3359 | size_int (precision - size), 0)); | |
2bc77e10 | 3360 | } |
79109eec | 3361 | |
203a24c4 | 3362 | /* Subroutine for fold: determine if VAL is the INTEGER_CONST that |
3363 | represents the sign bit of EXP's type. If EXP represents a sign | |
3364 | or zero extension, also test VAL against the unextended type. | |
3365 | The return value is the (sub)expression whose sign bit is VAL, | |
3366 | or NULL_TREE otherwise. */ | |
3367 | ||
3368 | static tree | |
de1b648b | 3369 | sign_bit_p (tree exp, tree val) |
203a24c4 | 3370 | { |
a4de5624 | 3371 | unsigned HOST_WIDE_INT mask_lo, lo; |
3372 | HOST_WIDE_INT mask_hi, hi; | |
203a24c4 | 3373 | int width; |
3374 | tree t; | |
3375 | ||
95cc2547 | 3376 | /* Tree EXP must have an integral type. */ |
203a24c4 | 3377 | t = TREE_TYPE (exp); |
3378 | if (! INTEGRAL_TYPE_P (t)) | |
3379 | return NULL_TREE; | |
3380 | ||
3381 | /* Tree VAL must be an integer constant. */ | |
3382 | if (TREE_CODE (val) != INTEGER_CST | |
3383 | || TREE_CONSTANT_OVERFLOW (val)) | |
3384 | return NULL_TREE; | |
3385 | ||
3386 | width = TYPE_PRECISION (t); | |
3387 | if (width > HOST_BITS_PER_WIDE_INT) | |
3388 | { | |
3389 | hi = (unsigned HOST_WIDE_INT) 1 << (width - HOST_BITS_PER_WIDE_INT - 1); | |
3390 | lo = 0; | |
a4de5624 | 3391 | |
3392 | mask_hi = ((unsigned HOST_WIDE_INT) -1 | |
3393 | >> (2 * HOST_BITS_PER_WIDE_INT - width)); | |
3394 | mask_lo = -1; | |
203a24c4 | 3395 | } |
3396 | else | |
3397 | { | |
3398 | hi = 0; | |
3399 | lo = (unsigned HOST_WIDE_INT) 1 << (width - 1); | |
a4de5624 | 3400 | |
3401 | mask_hi = 0; | |
3402 | mask_lo = ((unsigned HOST_WIDE_INT) -1 | |
3403 | >> (HOST_BITS_PER_WIDE_INT - width)); | |
203a24c4 | 3404 | } |
3405 | ||
a4de5624 | 3406 | /* We mask off those bits beyond TREE_TYPE (exp) so that we can |
3407 | treat VAL as if it were unsigned. */ | |
3408 | if ((TREE_INT_CST_HIGH (val) & mask_hi) == hi | |
3409 | && (TREE_INT_CST_LOW (val) & mask_lo) == lo) | |
203a24c4 | 3410 | return exp; |
3411 | ||
3412 | /* Handle extension from a narrower type. */ | |
3413 | if (TREE_CODE (exp) == NOP_EXPR | |
3414 | && TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (exp, 0))) < width) | |
3415 | return sign_bit_p (TREE_OPERAND (exp, 0), val); | |
3416 | ||
3417 | return NULL_TREE; | |
3418 | } | |
3419 | ||
79109eec | 3420 | /* Subroutine for fold_truthop: determine if an operand is simple enough |
3421 | to be evaluated unconditionally. */ | |
3422 | ||
cc049fa3 | 3423 | static int |
de1b648b | 3424 | simple_operand_p (tree exp) |
79109eec | 3425 | { |
3426 | /* Strip any conversions that don't change the machine mode. */ | |
3427 | while ((TREE_CODE (exp) == NOP_EXPR | |
3428 | || TREE_CODE (exp) == CONVERT_EXPR) | |
3429 | && (TYPE_MODE (TREE_TYPE (exp)) | |
3430 | == TYPE_MODE (TREE_TYPE (TREE_OPERAND (exp, 0))))) | |
3431 | exp = TREE_OPERAND (exp, 0); | |
3432 | ||
ce45a448 | 3433 | return (CONSTANT_CLASS_P (exp) |
9308e976 | 3434 | || (DECL_P (exp) |
79109eec | 3435 | && ! TREE_ADDRESSABLE (exp) |
3436 | && ! TREE_THIS_VOLATILE (exp) | |
7735dddb | 3437 | && ! DECL_NONLOCAL (exp) |
3438 | /* Don't regard global variables as simple. They may be | |
3439 | allocated in ways unknown to the compiler (shared memory, | |
3440 | #pragma weak, etc). */ | |
3441 | && ! TREE_PUBLIC (exp) | |
3442 | && ! DECL_EXTERNAL (exp) | |
3443 | /* Loading a static variable is unduly expensive, but global | |
3444 | registers aren't expensive. */ | |
3445 | && (! TREE_STATIC (exp) || DECL_REGISTER (exp)))); | |
79109eec | 3446 | } |
2bc77e10 | 3447 | \f |
12ec0a8a | 3448 | /* The following functions are subroutines to fold_range_test and allow it to |
3449 | try to change a logical combination of comparisons into a range test. | |
3450 | ||
3451 | For example, both | |
de1b648b | 3452 | X == 2 || X == 3 || X == 4 || X == 5 |
12ec0a8a | 3453 | and |
de1b648b | 3454 | X >= 2 && X <= 5 |
12ec0a8a | 3455 | are converted to |
3456 | (unsigned) (X - 2) <= 3 | |
3457 | ||
ad87de1e | 3458 | We describe each set of comparisons as being either inside or outside |
12ec0a8a | 3459 | a range, using a variable named like IN_P, and then describe the |
3460 | range with a lower and upper bound. If one of the bounds is omitted, | |
3461 | it represents either the highest or lowest value of the type. | |
3462 | ||
3463 | In the comments below, we represent a range by two numbers in brackets | |
ad87de1e | 3464 | preceded by a "+" to designate being inside that range, or a "-" to |
12ec0a8a | 3465 | designate being outside that range, so the condition can be inverted by |
3466 | flipping the prefix. An omitted bound is represented by a "-". For | |
3467 | example, "- [-, 10]" means being outside the range starting at the lowest | |
3468 | possible value and ending at 10, in other words, being greater than 10. | |
3469 | The range "+ [-, -]" is always true and hence the range "- [-, -]" is | |
3470 | always false. | |
3471 | ||
3472 | We set up things so that the missing bounds are handled in a consistent | |
3473 | manner so neither a missing bound nor "true" and "false" need to be | |
3474 | handled using a special case. */ | |
3475 | ||
3476 | /* Return the result of applying CODE to ARG0 and ARG1, but handle the case | |
3477 | of ARG0 and/or ARG1 being omitted, meaning an unlimited range. UPPER0_P | |
3478 | and UPPER1_P are nonzero if the respective argument is an upper bound | |
3479 | and zero for a lower. TYPE, if nonzero, is the type of the result; it | |
3480 | must be specified for a comparison. ARG1 will be converted to ARG0's | |
3481 | type if both are specified. */ | |
6f725368 | 3482 | |
12ec0a8a | 3483 | static tree |
dc81944a | 3484 | range_binop (enum tree_code code, tree type, tree arg0, int upper0_p, |
3485 | tree arg1, int upper1_p) | |
12ec0a8a | 3486 | { |
7560c8de | 3487 | tree tem; |
12ec0a8a | 3488 | int result; |
3489 | int sgn0, sgn1; | |
6f725368 | 3490 | |
12ec0a8a | 3491 | /* If neither arg represents infinity, do the normal operation. |
3492 | Else, if not a comparison, return infinity. Else handle the special | |
3493 | comparison rules. Note that most of the cases below won't occur, but | |
3494 | are handled for consistency. */ | |
6f725368 | 3495 | |
12ec0a8a | 3496 | if (arg0 != 0 && arg1 != 0) |
7560c8de | 3497 | { |
fd96eeef | 3498 | tem = fold (build2 (code, type != 0 ? type : TREE_TYPE (arg0), |
3499 | arg0, fold_convert (TREE_TYPE (arg0), arg1))); | |
7560c8de | 3500 | STRIP_NOPS (tem); |
3501 | return TREE_CODE (tem) == INTEGER_CST ? tem : 0; | |
3502 | } | |
6f725368 | 3503 | |
ce45a448 | 3504 | if (TREE_CODE_CLASS (code) != tcc_comparison) |
12ec0a8a | 3505 | return 0; |
3506 | ||
3507 | /* Set SGN[01] to -1 if ARG[01] is a lower bound, 1 for upper, and 0 | |
621ba396 | 3508 | for neither. In real maths, we cannot assume open ended ranges are |
3509 | the same. But, this is computer arithmetic, where numbers are finite. | |
3510 | We can therefore make the transformation of any unbounded range with | |
3511 | the value Z, Z being greater than any representable number. This permits | |
6312a35e | 3512 | us to treat unbounded ranges as equal. */ |
12ec0a8a | 3513 | sgn0 = arg0 != 0 ? 0 : (upper0_p ? 1 : -1); |
263497ab | 3514 | sgn1 = arg1 != 0 ? 0 : (upper1_p ? 1 : -1); |
12ec0a8a | 3515 | switch (code) |
3516 | { | |
621ba396 | 3517 | case EQ_EXPR: |
3518 | result = sgn0 == sgn1; | |
3519 | break; | |
3520 | case NE_EXPR: | |
3521 | result = sgn0 != sgn1; | |
12ec0a8a | 3522 | break; |
621ba396 | 3523 | case LT_EXPR: |
12ec0a8a | 3524 | result = sgn0 < sgn1; |
3525 | break; | |
621ba396 | 3526 | case LE_EXPR: |
3527 | result = sgn0 <= sgn1; | |
3528 | break; | |
3529 | case GT_EXPR: | |
12ec0a8a | 3530 | result = sgn0 > sgn1; |
3531 | break; | |
621ba396 | 3532 | case GE_EXPR: |
3533 | result = sgn0 >= sgn1; | |
3534 | break; | |
0dbd1c74 | 3535 | default: |
fdada98f | 3536 | gcc_unreachable (); |
12ec0a8a | 3537 | } |
3538 | ||
20783f07 | 3539 | return constant_boolean_node (result, type); |
12ec0a8a | 3540 | } |
cc049fa3 | 3541 | \f |
12ec0a8a | 3542 | /* Given EXP, a logical expression, set the range it is testing into |
3543 | variables denoted by PIN_P, PLOW, and PHIGH. Return the expression | |
62af9abe | 3544 | actually being tested. *PLOW and *PHIGH will be made of the same type |
12ec0a8a | 3545 | as the returned expression. If EXP is not a comparison, we will most |
3546 | likely not be returning a useful value and range. */ | |
6f725368 | 3547 | |
bfd67d2c | 3548 | static tree |
de1b648b | 3549 | make_range (tree exp, int *pin_p, tree *plow, tree *phigh) |
6f725368 | 3550 | { |
12ec0a8a | 3551 | enum tree_code code; |
7206da1b | 3552 | tree arg0 = NULL_TREE, arg1 = NULL_TREE; |
3553 | tree exp_type = NULL_TREE, arg0_type = NULL_TREE; | |
12ec0a8a | 3554 | int in_p, n_in_p; |
3555 | tree low, high, n_low, n_high; | |
6f725368 | 3556 | |
12ec0a8a | 3557 | /* Start with simply saying "EXP != 0" and then look at the code of EXP |
3558 | and see if we can refine the range. Some of the cases below may not | |
3559 | happen, but it doesn't seem worth worrying about this. We "continue" | |
3560 | the outer loop when we've changed something; otherwise we "break" | |
3561 | the switch, which will "break" the while. */ | |
6f725368 | 3562 | |
b30e3dbc | 3563 | in_p = 0; |
3564 | low = high = fold_convert (TREE_TYPE (exp), integer_zero_node); | |
12ec0a8a | 3565 | |
3566 | while (1) | |
6f725368 | 3567 | { |
12ec0a8a | 3568 | code = TREE_CODE (exp); |
7206da1b | 3569 | exp_type = TREE_TYPE (exp); |
5eb945de | 3570 | |
3571 | if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code))) | |
3572 | { | |
13795292 | 3573 | if (first_rtl_op (code) > 0) |
3574 | arg0 = TREE_OPERAND (exp, 0); | |
ce45a448 | 3575 | if (TREE_CODE_CLASS (code) == tcc_comparison |
3576 | || TREE_CODE_CLASS (code) == tcc_unary | |
3577 | || TREE_CODE_CLASS (code) == tcc_binary) | |
7206da1b | 3578 | arg0_type = TREE_TYPE (arg0); |
ce45a448 | 3579 | if (TREE_CODE_CLASS (code) == tcc_binary |
3580 | || TREE_CODE_CLASS (code) == tcc_comparison | |
3581 | || (TREE_CODE_CLASS (code) == tcc_expression | |
3f1e707c | 3582 | && TREE_CODE_LENGTH (code) > 1)) |
5eb945de | 3583 | arg1 = TREE_OPERAND (exp, 1); |
3584 | } | |
6f725368 | 3585 | |
12ec0a8a | 3586 | switch (code) |
3587 | { | |
3588 | case TRUTH_NOT_EXPR: | |
3589 | in_p = ! in_p, exp = arg0; | |
3590 | continue; | |
3591 | ||
3592 | case EQ_EXPR: case NE_EXPR: | |
3593 | case LT_EXPR: case LE_EXPR: case GE_EXPR: case GT_EXPR: | |
3594 | /* We can only do something if the range is testing for zero | |
3595 | and if the second operand is an integer constant. Note that | |
3596 | saying something is "in" the range we make is done by | |
3597 | complementing IN_P since it will set in the initial case of | |
3598 | being not equal to zero; "out" is leaving it alone. */ | |
3599 | if (low == 0 || high == 0 | |
3600 | || ! integer_zerop (low) || ! integer_zerop (high) | |
3601 | || TREE_CODE (arg1) != INTEGER_CST) | |
3602 | break; | |
6f725368 | 3603 | |
12ec0a8a | 3604 | switch (code) |
3605 | { | |
3606 | case NE_EXPR: /* - [c, c] */ | |
3607 | low = high = arg1; | |
3608 | break; | |
3609 | case EQ_EXPR: /* + [c, c] */ | |
3610 | in_p = ! in_p, low = high = arg1; | |
3611 | break; | |
3612 | case GT_EXPR: /* - [-, c] */ | |
3613 | low = 0, high = arg1; | |
3614 | break; | |
3615 | case GE_EXPR: /* + [c, -] */ | |
3616 | in_p = ! in_p, low = arg1, high = 0; | |
3617 | break; | |
3618 | case LT_EXPR: /* - [c, -] */ | |
3619 | low = arg1, high = 0; | |
3620 | break; | |
3621 | case LE_EXPR: /* + [-, c] */ | |
3622 | in_p = ! in_p, low = 0, high = arg1; | |
3623 | break; | |
0dbd1c74 | 3624 | default: |
fdada98f | 3625 | gcc_unreachable (); |
12ec0a8a | 3626 | } |
6f725368 | 3627 | |
c317c285 | 3628 | /* If this is an unsigned comparison, we also know that EXP is |
a9e29e86 | 3629 | greater than or equal to zero. We base the range tests we make |
3630 | on that fact, so we record it here so we can parse existing | |
7206da1b | 3631 | range tests. We test arg0_type since often the return type |
3632 | of, e.g. EQ_EXPR, is boolean. */ | |
3633 | if (TYPE_UNSIGNED (arg0_type) && (low == 0 || high == 0)) | |
12ec0a8a | 3634 | { |
5c9198bd | 3635 | if (! merge_ranges (&n_in_p, &n_low, &n_high, |
3636 | in_p, low, high, 1, | |
3637 | fold_convert (arg0_type, integer_zero_node), | |
a9e29e86 | 3638 | NULL_TREE)) |
12ec0a8a | 3639 | break; |
6f725368 | 3640 | |
12ec0a8a | 3641 | in_p = n_in_p, low = n_low, high = n_high; |
a9e29e86 | 3642 | |
751e10d1 | 3643 | /* If the high bound is missing, but we have a nonzero low |
e524954a | 3644 | bound, reverse the range so it goes from zero to the low bound |
3645 | minus 1. */ | |
3646 | if (high == 0 && low && ! integer_zerop (low)) | |
a9e29e86 | 3647 | { |
3648 | in_p = ! in_p; | |
3649 | high = range_binop (MINUS_EXPR, NULL_TREE, low, 0, | |
3650 | integer_one_node, 0); | |
7206da1b | 3651 | low = fold_convert (arg0_type, integer_zero_node); |
a9e29e86 | 3652 | } |
12ec0a8a | 3653 | } |
7206da1b | 3654 | |
3655 | exp = arg0; | |
12ec0a8a | 3656 | continue; |
3657 | ||
3658 | case NEGATE_EXPR: | |
3659 | /* (-x) IN [a,b] -> x in [-b, -a] */ | |
7206da1b | 3660 | n_low = range_binop (MINUS_EXPR, exp_type, |
3661 | fold_convert (exp_type, integer_zero_node), | |
b30e3dbc | 3662 | 0, high, 1); |
7206da1b | 3663 | n_high = range_binop (MINUS_EXPR, exp_type, |
3664 | fold_convert (exp_type, integer_zero_node), | |
b30e3dbc | 3665 | 0, low, 0); |
12ec0a8a | 3666 | low = n_low, high = n_high; |
3667 | exp = arg0; | |
3668 | continue; | |
3669 | ||
3670 | case BIT_NOT_EXPR: | |
3671 | /* ~ X -> -X - 1 */ | |
7206da1b | 3672 | exp = build2 (MINUS_EXPR, exp_type, negate_expr (arg0), |
3673 | fold_convert (exp_type, integer_one_node)); | |
12ec0a8a | 3674 | continue; |
3675 | ||
3676 | case PLUS_EXPR: case MINUS_EXPR: | |
3677 | if (TREE_CODE (arg1) != INTEGER_CST) | |
3678 | break; | |
3679 | ||
3680 | /* If EXP is signed, any overflow in the computation is undefined, | |
3681 | so we don't worry about it so long as our computations on | |
3682 | the bounds don't overflow. For unsigned, overflow is defined | |
3683 | and this is exactly the right thing. */ | |
3684 | n_low = range_binop (code == MINUS_EXPR ? PLUS_EXPR : MINUS_EXPR, | |
7206da1b | 3685 | arg0_type, low, 0, arg1, 0); |
12ec0a8a | 3686 | n_high = range_binop (code == MINUS_EXPR ? PLUS_EXPR : MINUS_EXPR, |
7206da1b | 3687 | arg0_type, high, 1, arg1, 0); |
12ec0a8a | 3688 | if ((n_low != 0 && TREE_OVERFLOW (n_low)) |
3689 | || (n_high != 0 && TREE_OVERFLOW (n_high))) | |
3690 | break; | |
3691 | ||
6b457c77 | 3692 | /* Check for an unsigned range which has wrapped around the maximum |
3693 | value thus making n_high < n_low, and normalize it. */ | |
98db800f | 3694 | if (n_low && n_high && tree_int_cst_lt (n_high, n_low)) |
6b457c77 | 3695 | { |
7206da1b | 3696 | low = range_binop (PLUS_EXPR, arg0_type, n_high, 0, |
a9e29e86 | 3697 | integer_one_node, 0); |
7206da1b | 3698 | high = range_binop (MINUS_EXPR, arg0_type, n_low, 0, |
a80d786b | 3699 | integer_one_node, 0); |
3700 | ||
3701 | /* If the range is of the form +/- [ x+1, x ], we won't | |
3702 | be able to normalize it. But then, it represents the | |
3703 | whole range or the empty set, so make it | |
3704 | +/- [ -, - ]. */ | |
3705 | if (tree_int_cst_equal (n_low, low) | |
3706 | && tree_int_cst_equal (n_high, high)) | |
3707 | low = high = 0; | |
3708 | else | |
3709 | in_p = ! in_p; | |
6b457c77 | 3710 | } |
98db800f | 3711 | else |
3712 | low = n_low, high = n_high; | |
7560c8de | 3713 | |
12ec0a8a | 3714 | exp = arg0; |
3715 | continue; | |
3716 | ||
3717 | case NOP_EXPR: case NON_LVALUE_EXPR: case CONVERT_EXPR: | |
7206da1b | 3718 | if (TYPE_PRECISION (arg0_type) > TYPE_PRECISION (exp_type)) |
d6d65bd2 | 3719 | break; |
3720 | ||
7206da1b | 3721 | if (! INTEGRAL_TYPE_P (arg0_type) |
3722 | || (low != 0 && ! int_fits_type_p (low, arg0_type)) | |
3723 | || (high != 0 && ! int_fits_type_p (high, arg0_type))) | |
12ec0a8a | 3724 | break; |
3725 | ||
4cd44a59 | 3726 | n_low = low, n_high = high; |
12ec0a8a | 3727 | |
4cd44a59 | 3728 | if (n_low != 0) |
7206da1b | 3729 | n_low = fold_convert (arg0_type, n_low); |
4cd44a59 | 3730 | |
3731 | if (n_high != 0) | |
7206da1b | 3732 | n_high = fold_convert (arg0_type, n_high); |
4cd44a59 | 3733 | |
4cd44a59 | 3734 | |
7206da1b | 3735 | /* If we're converting arg0 from an unsigned type, to exp, |
2c763ed4 | 3736 | a signed type, we will be doing the comparison as unsigned. |
7206da1b | 3737 | The tests above have already verified that LOW and HIGH |
3738 | are both positive. | |
3739 | ||
3740 | So we have to ensure that we will handle large unsigned | |
3741 | values the same way that the current signed bounds treat | |
3742 | negative values. */ | |
3743 | ||
3744 | if (!TYPE_UNSIGNED (exp_type) && TYPE_UNSIGNED (arg0_type)) | |
4cd44a59 | 3745 | { |
f52483b5 | 3746 | tree high_positive; |
7206da1b | 3747 | tree equiv_type = lang_hooks.types.type_for_mode |
3748 | (TYPE_MODE (arg0_type), 1); | |
f52483b5 | 3749 | |
3750 | /* A range without an upper bound is, naturally, unbounded. | |
3751 | Since convert would have cropped a very large value, use | |
155b05dc | 3752 | the max value for the destination type. */ |
3753 | high_positive | |
3754 | = TYPE_MAX_VALUE (equiv_type) ? TYPE_MAX_VALUE (equiv_type) | |
7206da1b | 3755 | : TYPE_MAX_VALUE (arg0_type); |
f52483b5 | 3756 | |
7206da1b | 3757 | if (TYPE_PRECISION (exp_type) == TYPE_PRECISION (arg0_type)) |
3758 | high_positive = fold (build2 (RSHIFT_EXPR, arg0_type, | |
3759 | fold_convert (arg0_type, | |
fd96eeef | 3760 | high_positive), |
7206da1b | 3761 | fold_convert (arg0_type, |
fd96eeef | 3762 | integer_one_node))); |
cc049fa3 | 3763 | |
4cd44a59 | 3764 | /* If the low bound is specified, "and" the range with the |
3765 | range for which the original unsigned value will be | |
3766 | positive. */ | |
3767 | if (low != 0) | |
3768 | { | |
3769 | if (! merge_ranges (&n_in_p, &n_low, &n_high, | |
b30e3dbc | 3770 | 1, n_low, n_high, 1, |
5c9198bd | 3771 | fold_convert (arg0_type, |
3772 | integer_zero_node), | |
4cd44a59 | 3773 | high_positive)) |
3774 | break; | |
3775 | ||
3776 | in_p = (n_in_p == in_p); | |
3777 | } | |
3778 | else | |
3779 | { | |
3780 | /* Otherwise, "or" the range with the range of the input | |
3781 | that will be interpreted as negative. */ | |
3782 | if (! merge_ranges (&n_in_p, &n_low, &n_high, | |
b30e3dbc | 3783 | 0, n_low, n_high, 1, |
5c9198bd | 3784 | fold_convert (arg0_type, |
3785 | integer_zero_node), | |
4cd44a59 | 3786 | high_positive)) |
3787 | break; | |
3788 | ||
3789 | in_p = (in_p != n_in_p); | |
3790 | } | |
3791 | } | |
12ec0a8a | 3792 | |
3793 | exp = arg0; | |
4cd44a59 | 3794 | low = n_low, high = n_high; |
12ec0a8a | 3795 | continue; |
4cd44a59 | 3796 | |
3797 | default: | |
3798 | break; | |
6f725368 | 3799 | } |
12ec0a8a | 3800 | |
3801 | break; | |
6f725368 | 3802 | } |
12ec0a8a | 3803 | |
f83854c8 | 3804 | /* If EXP is a constant, we can evaluate whether this is true or false. */ |
3805 | if (TREE_CODE (exp) == INTEGER_CST) | |
3806 | { | |
3807 | in_p = in_p == (integer_onep (range_binop (GE_EXPR, integer_type_node, | |
3808 | exp, 0, low, 0)) | |
3809 | && integer_onep (range_binop (LE_EXPR, integer_type_node, | |
3810 | exp, 1, high, 1))); | |
3811 | low = high = 0; | |
3812 | exp = 0; | |
3813 | } | |
3814 | ||
12ec0a8a | 3815 | *pin_p = in_p, *plow = low, *phigh = high; |
3816 | return exp; | |
3817 | } | |
3818 | \f | |
3819 | /* Given a range, LOW, HIGH, and IN_P, an expression, EXP, and a result | |
3820 | type, TYPE, return an expression to test if EXP is in (or out of, depending | |
3b3a787a | 3821 | on IN_P) the range. Return 0 if the test couldn't be created. */ |
12ec0a8a | 3822 | |
3823 | static tree | |
de1b648b | 3824 | build_range_check (tree type, tree exp, int in_p, tree low, tree high) |
12ec0a8a | 3825 | { |
3826 | tree etype = TREE_TYPE (exp); | |
843dd7a3 | 3827 | tree value; |
12ec0a8a | 3828 | |
3b3a787a | 3829 | if (! in_p) |
3830 | { | |
3831 | value = build_range_check (type, exp, 1, low, high); | |
3832 | if (value != 0) | |
3833 | return invert_truthvalue (value); | |
3834 | ||
3835 | return 0; | |
3836 | } | |
12ec0a8a | 3837 | |
843dd7a3 | 3838 | if (low == 0 && high == 0) |
b30e3dbc | 3839 | return fold_convert (type, integer_one_node); |
12ec0a8a | 3840 | |
843dd7a3 | 3841 | if (low == 0) |
fd96eeef | 3842 | return fold (build2 (LE_EXPR, type, exp, high)); |
12ec0a8a | 3843 | |
843dd7a3 | 3844 | if (high == 0) |
fd96eeef | 3845 | return fold (build2 (GE_EXPR, type, exp, low)); |
12ec0a8a | 3846 | |
843dd7a3 | 3847 | if (operand_equal_p (low, high, 0)) |
fd96eeef | 3848 | return fold (build2 (EQ_EXPR, type, exp, low)); |
12ec0a8a | 3849 | |
843dd7a3 | 3850 | if (integer_zerop (low)) |
6f725368 | 3851 | { |
78a8ed03 | 3852 | if (! TYPE_UNSIGNED (etype)) |
d3371fcd | 3853 | { |
fa8b888f | 3854 | etype = lang_hooks.types.unsigned_type (etype); |
b30e3dbc | 3855 | high = fold_convert (etype, high); |
3856 | exp = fold_convert (etype, exp); | |
d3371fcd | 3857 | } |
843dd7a3 | 3858 | return build_range_check (type, exp, 1, 0, high); |
12ec0a8a | 3859 | } |
6f725368 | 3860 | |
843dd7a3 | 3861 | /* Optimize (c>=1) && (c<=127) into (signed char)c > 0. */ |
3862 | if (integer_onep (low) && TREE_CODE (high) == INTEGER_CST) | |
3863 | { | |
3864 | unsigned HOST_WIDE_INT lo; | |
3865 | HOST_WIDE_INT hi; | |
3866 | int prec; | |
3867 | ||
3868 | prec = TYPE_PRECISION (etype); | |
3869 | if (prec <= HOST_BITS_PER_WIDE_INT) | |
d3371fcd | 3870 | { |
3871 | hi = 0; | |
3872 | lo = ((unsigned HOST_WIDE_INT) 1 << (prec - 1)) - 1; | |
3873 | } | |
843dd7a3 | 3874 | else |
d3371fcd | 3875 | { |
3876 | hi = ((HOST_WIDE_INT) 1 << (prec - HOST_BITS_PER_WIDE_INT - 1)) - 1; | |
3877 | lo = (unsigned HOST_WIDE_INT) -1; | |
3878 | } | |
843dd7a3 | 3879 | |
3880 | if (TREE_INT_CST_HIGH (high) == hi && TREE_INT_CST_LOW (high) == lo) | |
d3371fcd | 3881 | { |
78a8ed03 | 3882 | if (TYPE_UNSIGNED (etype)) |
d3371fcd | 3883 | { |
fa8b888f | 3884 | etype = lang_hooks.types.signed_type (etype); |
b30e3dbc | 3885 | exp = fold_convert (etype, exp); |
d3371fcd | 3886 | } |
fd96eeef | 3887 | return fold (build2 (GT_EXPR, type, exp, |
3888 | fold_convert (etype, integer_zero_node))); | |
d3371fcd | 3889 | } |
843dd7a3 | 3890 | } |
3891 | ||
3b3a787a | 3892 | value = const_binop (MINUS_EXPR, high, low, 0); |
3893 | if (value != 0 && TREE_OVERFLOW (value) && ! TYPE_UNSIGNED (etype)) | |
3894 | { | |
3895 | tree utype, minv, maxv; | |
3896 | ||
3897 | /* Check if (unsigned) INT_MAX + 1 == (unsigned) INT_MIN | |
3898 | for the type in question, as we rely on this here. */ | |
3899 | switch (TREE_CODE (etype)) | |
3900 | { | |
3901 | case INTEGER_TYPE: | |
3902 | case ENUMERAL_TYPE: | |
3903 | case CHAR_TYPE: | |
3904 | utype = lang_hooks.types.unsigned_type (etype); | |
3905 | maxv = fold_convert (utype, TYPE_MAX_VALUE (etype)); | |
3906 | maxv = range_binop (PLUS_EXPR, NULL_TREE, maxv, 1, | |
3907 | integer_one_node, 1); | |
3908 | minv = fold_convert (utype, TYPE_MIN_VALUE (etype)); | |
3909 | if (integer_zerop (range_binop (NE_EXPR, integer_type_node, | |
3910 | minv, 1, maxv, 1))) | |
3911 | { | |
3912 | etype = utype; | |
3913 | high = fold_convert (etype, high); | |
3914 | low = fold_convert (etype, low); | |
3915 | exp = fold_convert (etype, exp); | |
3916 | value = const_binop (MINUS_EXPR, high, low, 0); | |
3917 | } | |
3918 | break; | |
3919 | default: | |
3920 | break; | |
3921 | } | |
3922 | } | |
3923 | ||
3924 | if (value != 0 && ! TREE_OVERFLOW (value)) | |
12ec0a8a | 3925 | return build_range_check (type, |
fd96eeef | 3926 | fold (build2 (MINUS_EXPR, etype, exp, low)), |
b30e3dbc | 3927 | 1, fold_convert (etype, integer_zero_node), |
3928 | value); | |
843dd7a3 | 3929 | |
3930 | return 0; | |
12ec0a8a | 3931 | } |
3932 | \f | |
cc049fa3 | 3933 | /* Given two ranges, see if we can merge them into one. Return 1 if we |
12ec0a8a | 3934 | can, 0 if we can't. Set the output range into the specified parameters. */ |
6f725368 | 3935 | |
12ec0a8a | 3936 | static int |
dc81944a | 3937 | merge_ranges (int *pin_p, tree *plow, tree *phigh, int in0_p, tree low0, |
3938 | tree high0, int in1_p, tree low1, tree high1) | |
12ec0a8a | 3939 | { |
3940 | int no_overlap; | |
3941 | int subset; | |
3942 | int temp; | |
3943 | tree tem; | |
3944 | int in_p; | |
3945 | tree low, high; | |
4cd44a59 | 3946 | int lowequal = ((low0 == 0 && low1 == 0) |
3947 | || integer_onep (range_binop (EQ_EXPR, integer_type_node, | |
3948 | low0, 0, low1, 0))); | |
3949 | int highequal = ((high0 == 0 && high1 == 0) | |
3950 | || integer_onep (range_binop (EQ_EXPR, integer_type_node, | |
3951 | high0, 1, high1, 1))); | |
3952 | ||
3953 | /* Make range 0 be the range that starts first, or ends last if they | |
3954 | start at the same value. Swap them if it isn't. */ | |
cc049fa3 | 3955 | if (integer_onep (range_binop (GT_EXPR, integer_type_node, |
12ec0a8a | 3956 | low0, 0, low1, 0)) |
4cd44a59 | 3957 | || (lowequal |
12ec0a8a | 3958 | && integer_onep (range_binop (GT_EXPR, integer_type_node, |
4cd44a59 | 3959 | high1, 1, high0, 1)))) |
12ec0a8a | 3960 | { |
3961 | temp = in0_p, in0_p = in1_p, in1_p = temp; | |
3962 | tem = low0, low0 = low1, low1 = tem; | |
3963 | tem = high0, high0 = high1, high1 = tem; | |
3964 | } | |
6f725368 | 3965 | |
12ec0a8a | 3966 | /* Now flag two cases, whether the ranges are disjoint or whether the |
3967 | second range is totally subsumed in the first. Note that the tests | |
3968 | below are simplified by the ones above. */ | |
3969 | no_overlap = integer_onep (range_binop (LT_EXPR, integer_type_node, | |
3970 | high0, 1, low1, 0)); | |
718acf6d | 3971 | subset = integer_onep (range_binop (LE_EXPR, integer_type_node, |
12ec0a8a | 3972 | high1, 1, high0, 1)); |
3973 | ||
3974 | /* We now have four cases, depending on whether we are including or | |
3975 | excluding the two ranges. */ | |
3976 | if (in0_p && in1_p) | |
3977 | { | |
3978 | /* If they don't overlap, the result is false. If the second range | |
3979 | is a subset it is the result. Otherwise, the range is from the start | |
3980 | of the second to the end of the first. */ | |
3981 | if (no_overlap) | |
3982 | in_p = 0, low = high = 0; | |
3983 | else if (subset) | |
3984 | in_p = 1, low = low1, high = high1; | |
3985 | else | |
3986 | in_p = 1, low = low1, high = high0; | |
3987 | } | |
6f725368 | 3988 | |
12ec0a8a | 3989 | else if (in0_p && ! in1_p) |
3990 | { | |
4cd44a59 | 3991 | /* If they don't overlap, the result is the first range. If they are |
3992 | equal, the result is false. If the second range is a subset of the | |
3993 | first, and the ranges begin at the same place, we go from just after | |
3994 | the end of the first range to the end of the second. If the second | |
3995 | range is not a subset of the first, or if it is a subset and both | |
3996 | ranges end at the same place, the range starts at the start of the | |
3997 | first range and ends just before the second range. | |
3998 | Otherwise, we can't describe this as a single range. */ | |
12ec0a8a | 3999 | if (no_overlap) |
4000 | in_p = 1, low = low0, high = high0; | |
4cd44a59 | 4001 | else if (lowequal && highequal) |
08986c47 | 4002 | in_p = 0, low = high = 0; |
4cd44a59 | 4003 | else if (subset && lowequal) |
4004 | { | |
4005 | in_p = 1, high = high0; | |
4006 | low = range_binop (PLUS_EXPR, NULL_TREE, high1, 0, | |
cc049fa3 | 4007 | integer_one_node, 0); |
4cd44a59 | 4008 | } |
4009 | else if (! subset || highequal) | |
12ec0a8a | 4010 | { |
4011 | in_p = 1, low = low0; | |
4012 | high = range_binop (MINUS_EXPR, NULL_TREE, low1, 0, | |
a9e29e86 | 4013 | integer_one_node, 0); |
12ec0a8a | 4014 | } |
4cd44a59 | 4015 | else |
4016 | return 0; | |
12ec0a8a | 4017 | } |
6f725368 | 4018 | |
12ec0a8a | 4019 | else if (! in0_p && in1_p) |
4020 | { | |
4021 | /* If they don't overlap, the result is the second range. If the second | |
4022 | is a subset of the first, the result is false. Otherwise, | |
4023 | the range starts just after the first range and ends at the | |
4024 | end of the second. */ | |
4025 | if (no_overlap) | |
4026 | in_p = 1, low = low1, high = high1; | |
155b05dc | 4027 | else if (subset || highequal) |
12ec0a8a | 4028 | in_p = 0, low = high = 0; |
4029 | else | |
4030 | { | |
4031 | in_p = 1, high = high1; | |
4032 | low = range_binop (PLUS_EXPR, NULL_TREE, high0, 1, | |
4033 | integer_one_node, 0); | |
6f725368 | 4034 | } |
4035 | } | |
4036 | ||
12ec0a8a | 4037 | else |
4038 | { | |
4039 | /* The case where we are excluding both ranges. Here the complex case | |
4040 | is if they don't overlap. In that case, the only time we have a | |
4041 | range is if they are adjacent. If the second is a subset of the | |
4042 | first, the result is the first. Otherwise, the range to exclude | |
4043 | starts at the beginning of the first range and ends at the end of the | |
4044 | second. */ | |
4045 | if (no_overlap) | |
4046 | { | |
4047 | if (integer_onep (range_binop (EQ_EXPR, integer_type_node, | |
4048 | range_binop (PLUS_EXPR, NULL_TREE, | |
4049 | high0, 1, | |
4050 | integer_one_node, 1), | |
4051 | 1, low1, 0))) | |
4052 | in_p = 0, low = low0, high = high1; | |
4053 | else | |
3b3a787a | 4054 | { |
4055 | /* Canonicalize - [min, x] into - [-, x]. */ | |
4056 | if (low0 && TREE_CODE (low0) == INTEGER_CST) | |
4057 | switch (TREE_CODE (TREE_TYPE (low0))) | |
4058 | { | |
4059 | case ENUMERAL_TYPE: | |
4060 | if (TYPE_PRECISION (TREE_TYPE (low0)) | |
4061 | != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (low0)))) | |
4062 | break; | |
4063 | /* FALLTHROUGH */ | |
4064 | case INTEGER_TYPE: | |
4065 | case CHAR_TYPE: | |
4066 | if (tree_int_cst_equal (low0, | |
4067 | TYPE_MIN_VALUE (TREE_TYPE (low0)))) | |
4068 | low0 = 0; | |
4069 | break; | |
4070 | case POINTER_TYPE: | |
4071 | if (TYPE_UNSIGNED (TREE_TYPE (low0)) | |
4072 | && integer_zerop (low0)) | |
4073 | low0 = 0; | |
4074 | break; | |
4075 | default: | |
4076 | break; | |
4077 | } | |
4078 | ||
4079 | /* Canonicalize - [x, max] into - [x, -]. */ | |
4080 | if (high1 && TREE_CODE (high1) == INTEGER_CST) | |
4081 | switch (TREE_CODE (TREE_TYPE (high1))) | |
4082 | { | |
4083 | case ENUMERAL_TYPE: | |
4084 | if (TYPE_PRECISION (TREE_TYPE (high1)) | |
4085 | != GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (high1)))) | |
4086 | break; | |
4087 | /* FALLTHROUGH */ | |
4088 | case INTEGER_TYPE: | |
4089 | case CHAR_TYPE: | |
4090 | if (tree_int_cst_equal (high1, | |
4091 | TYPE_MAX_VALUE (TREE_TYPE (high1)))) | |
4092 | high1 = 0; | |
4093 | break; | |
4094 | case POINTER_TYPE: | |
4095 | if (TYPE_UNSIGNED (TREE_TYPE (high1)) | |
4096 | && integer_zerop (range_binop (PLUS_EXPR, NULL_TREE, | |
4097 | high1, 1, | |
4098 | integer_one_node, 1))) | |
4099 | high1 = 0; | |
4100 | break; | |
4101 | default: | |
4102 | break; | |
4103 | } | |
4104 | ||
4105 | /* The ranges might be also adjacent between the maximum and | |
4106 | minimum values of the given type. For | |
4107 | - [{min,-}, x] and - [y, {max,-}] ranges where x + 1 < y | |
4108 | return + [x + 1, y - 1]. */ | |
4109 | if (low0 == 0 && high1 == 0) | |
4110 | { | |
4111 | low = range_binop (PLUS_EXPR, NULL_TREE, high0, 1, | |
4112 | integer_one_node, 1); | |
4113 | high = range_binop (MINUS_EXPR, NULL_TREE, low1, 0, | |
4114 | integer_one_node, 0); | |
4115 | if (low == 0 || high == 0) | |
4116 | return 0; | |
4117 | ||
4118 | in_p = 1; | |
4119 | } | |
4120 | else | |
4121 | return 0; | |
4122 | } | |
12ec0a8a | 4123 | } |
4124 | else if (subset) | |
4125 | in_p = 0, low = low0, high = high0; | |
4126 | else | |
4127 | in_p = 0, low = low0, high = high1; | |
4128 | } | |
b29eae68 | 4129 | |
12ec0a8a | 4130 | *pin_p = in_p, *plow = low, *phigh = high; |
4131 | return 1; | |
4132 | } | |
0023616d | 4133 | \f |
4134 | ||
4135 | /* Subroutine of fold, looking inside expressions of the form | |
9b1fa4a0 | 4136 | A op B ? A : C, where ARG0, ARG1 and ARG2 are the three operands |
4137 | of the COND_EXPR. This function is being used also to optimize | |
4138 | A op B ? C : A, by reversing the comparison first. | |
0023616d | 4139 | |
4140 | Return a folded expression whose code is not a COND_EXPR | |
4141 | anymore, or NULL_TREE if no folding opportunity is found. */ | |
4142 | ||
4143 | static tree | |
9b1fa4a0 | 4144 | fold_cond_expr_with_comparison (tree type, tree arg0, tree arg1, tree arg2) |
0023616d | 4145 | { |
4146 | enum tree_code comp_code = TREE_CODE (arg0); | |
4147 | tree arg00 = TREE_OPERAND (arg0, 0); | |
4148 | tree arg01 = TREE_OPERAND (arg0, 1); | |
9b1fa4a0 | 4149 | tree arg1_type = TREE_TYPE (arg1); |
0023616d | 4150 | tree tem; |
9b1fa4a0 | 4151 | |
4152 | STRIP_NOPS (arg1); | |
0023616d | 4153 | STRIP_NOPS (arg2); |
4154 | ||
4155 | /* If we have A op 0 ? A : -A, consider applying the following | |
4156 | transformations: | |
4157 | ||
4158 | A == 0? A : -A same as -A | |
4159 | A != 0? A : -A same as A | |
4160 | A >= 0? A : -A same as abs (A) | |
4161 | A > 0? A : -A same as abs (A) | |
4162 | A <= 0? A : -A same as -abs (A) | |
4163 | A < 0? A : -A same as -abs (A) | |
4164 | ||
4165 | None of these transformations work for modes with signed | |
4166 | zeros. If A is +/-0, the first two transformations will | |
4167 | change the sign of the result (from +0 to -0, or vice | |
4168 | versa). The last four will fix the sign of the result, | |
4169 | even though the original expressions could be positive or | |
4170 | negative, depending on the sign of A. | |
4171 | ||
4172 | Note that all these transformations are correct if A is | |
4173 | NaN, since the two alternatives (A and -A) are also NaNs. */ | |
4174 | if ((FLOAT_TYPE_P (TREE_TYPE (arg01)) | |
4175 | ? real_zerop (arg01) | |
4176 | : integer_zerop (arg01)) | |
4177 | && TREE_CODE (arg2) == NEGATE_EXPR | |
9b1fa4a0 | 4178 | && operand_equal_p (TREE_OPERAND (arg2, 0), arg1, 0)) |
0023616d | 4179 | switch (comp_code) |
4180 | { | |
4181 | case EQ_EXPR: | |
fe9b47eb | 4182 | case UNEQ_EXPR: |
9b1fa4a0 | 4183 | tem = fold_convert (arg1_type, arg1); |
4184 | return pedantic_non_lvalue (fold_convert (type, negate_expr (tem))); | |
0023616d | 4185 | case NE_EXPR: |
fe9b47eb | 4186 | case LTGT_EXPR: |
9b1fa4a0 | 4187 | return pedantic_non_lvalue (fold_convert (type, arg1)); |
fe9b47eb | 4188 | case UNGE_EXPR: |
4189 | case UNGT_EXPR: | |
4190 | if (flag_trapping_math) | |
4191 | break; | |
4192 | /* Fall through. */ | |
0023616d | 4193 | case GE_EXPR: |
4194 | case GT_EXPR: | |
9b1fa4a0 | 4195 | if (TYPE_UNSIGNED (TREE_TYPE (arg1))) |
4196 | arg1 = fold_convert (lang_hooks.types.signed_type | |
4197 | (TREE_TYPE (arg1)), arg1); | |
4198 | tem = fold (build1 (ABS_EXPR, TREE_TYPE (arg1), arg1)); | |
0023616d | 4199 | return pedantic_non_lvalue (fold_convert (type, tem)); |
fe9b47eb | 4200 | case UNLE_EXPR: |
4201 | case UNLT_EXPR: | |
4202 | if (flag_trapping_math) | |
4203 | break; | |
0023616d | 4204 | case LE_EXPR: |
4205 | case LT_EXPR: | |
9b1fa4a0 | 4206 | if (TYPE_UNSIGNED (TREE_TYPE (arg1))) |
4207 | arg1 = fold_convert (lang_hooks.types.signed_type | |
4208 | (TREE_TYPE (arg1)), arg1); | |
4209 | tem = fold (build1 (ABS_EXPR, TREE_TYPE (arg1), arg1)); | |
0023616d | 4210 | return negate_expr (fold_convert (type, tem)); |
4211 | default: | |
ce45a448 | 4212 | gcc_assert (TREE_CODE_CLASS (comp_code) == tcc_comparison); |
fe9b47eb | 4213 | break; |
0023616d | 4214 | } |
4215 | ||
4216 | /* A != 0 ? A : 0 is simply A, unless A is -0. Likewise | |
4217 | A == 0 ? A : 0 is always 0 unless A is -0. Note that | |
4218 | both transformations are correct when A is NaN: A != 0 | |
4219 | is then true, and A == 0 is false. */ | |
4220 | ||
4221 | if (integer_zerop (arg01) && integer_zerop (arg2)) | |
4222 | { | |
4223 | if (comp_code == NE_EXPR) | |
9b1fa4a0 | 4224 | return pedantic_non_lvalue (fold_convert (type, arg1)); |
0023616d | 4225 | else if (comp_code == EQ_EXPR) |
5c9198bd | 4226 | return fold_convert (type, integer_zero_node); |
0023616d | 4227 | } |
4228 | ||
4229 | /* Try some transformations of A op B ? A : B. | |
4230 | ||
4231 | A == B? A : B same as B | |
4232 | A != B? A : B same as A | |
4233 | A >= B? A : B same as max (A, B) | |
4234 | A > B? A : B same as max (B, A) | |
4235 | A <= B? A : B same as min (A, B) | |
4236 | A < B? A : B same as min (B, A) | |
4237 | ||
4238 | As above, these transformations don't work in the presence | |
4239 | of signed zeros. For example, if A and B are zeros of | |
4240 | opposite sign, the first two transformations will change | |
4241 | the sign of the result. In the last four, the original | |
4242 | expressions give different results for (A=+0, B=-0) and | |
4243 | (A=-0, B=+0), but the transformed expressions do not. | |
4244 | ||
4245 | The first two transformations are correct if either A or B | |
4246 | is a NaN. In the first transformation, the condition will | |
4247 | be false, and B will indeed be chosen. In the case of the | |
4248 | second transformation, the condition A != B will be true, | |
4249 | and A will be chosen. | |
4250 | ||
4251 | The conversions to max() and min() are not correct if B is | |
4252 | a number and A is not. The conditions in the original | |
4253 | expressions will be false, so all four give B. The min() | |
4254 | and max() versions would give a NaN instead. */ | |
4255 | if (operand_equal_for_comparison_p (arg01, arg2, arg00)) | |
4256 | { | |
4257 | tree comp_op0 = arg00; | |
4258 | tree comp_op1 = arg01; | |
4259 | tree comp_type = TREE_TYPE (comp_op0); | |
4260 | ||
4261 | /* Avoid adding NOP_EXPRs in case this is an lvalue. */ | |
4262 | if (TYPE_MAIN_VARIANT (comp_type) == TYPE_MAIN_VARIANT (type)) | |
4263 | { | |
4264 | comp_type = type; | |
9b1fa4a0 | 4265 | comp_op0 = arg1; |
0023616d | 4266 | comp_op1 = arg2; |
4267 | } | |
4268 | ||
4269 | switch (comp_code) | |
4270 | { | |
4271 | case EQ_EXPR: | |
4272 | return pedantic_non_lvalue (fold_convert (type, arg2)); | |
4273 | case NE_EXPR: | |
9b1fa4a0 | 4274 | return pedantic_non_lvalue (fold_convert (type, arg1)); |
0023616d | 4275 | case LE_EXPR: |
4276 | case LT_EXPR: | |
fe9b47eb | 4277 | case UNLE_EXPR: |
4278 | case UNLT_EXPR: | |
0023616d | 4279 | /* In C++ a ?: expression can be an lvalue, so put the |
4280 | operand which will be used if they are equal first | |
4281 | so that we can convert this back to the | |
4282 | corresponding COND_EXPR. */ | |
9b1fa4a0 | 4283 | if (!HONOR_NANS (TYPE_MODE (TREE_TYPE (arg1)))) |
5c9198bd | 4284 | { |
4285 | comp_op0 = fold_convert (comp_type, comp_op0); | |
4286 | comp_op1 = fold_convert (comp_type, comp_op1); | |
fe9b47eb | 4287 | tem = (comp_code == LE_EXPR || comp_code == UNLE_EXPR) |
4288 | ? fold (build2 (MIN_EXPR, comp_type, comp_op0, comp_op1)) | |
4289 | : fold (build2 (MIN_EXPR, comp_type, comp_op1, comp_op0)); | |
5c9198bd | 4290 | return pedantic_non_lvalue (fold_convert (type, tem)); |
4291 | } | |
0023616d | 4292 | break; |
4293 | case GE_EXPR: | |
4294 | case GT_EXPR: | |
fe9b47eb | 4295 | case UNGE_EXPR: |
4296 | case UNGT_EXPR: | |
9b1fa4a0 | 4297 | if (!HONOR_NANS (TYPE_MODE (TREE_TYPE (arg1)))) |
5c9198bd | 4298 | { |
4299 | comp_op0 = fold_convert (comp_type, comp_op0); | |
4300 | comp_op1 = fold_convert (comp_type, comp_op1); | |
fe9b47eb | 4301 | tem = (comp_code == GE_EXPR || comp_code == UNGE_EXPR) |
4302 | ? fold (build2 (MAX_EXPR, comp_type, comp_op0, comp_op1)) | |
4303 | : fold (build2 (MAX_EXPR, comp_type, comp_op1, comp_op0)); | |
5c9198bd | 4304 | return pedantic_non_lvalue (fold_convert (type, tem)); |
4305 | } | |
0023616d | 4306 | break; |
fe9b47eb | 4307 | case UNEQ_EXPR: |
4308 | if (!HONOR_NANS (TYPE_MODE (TREE_TYPE (arg1)))) | |
4309 | return pedantic_non_lvalue (fold_convert (type, arg2)); | |
4310 | break; | |
4311 | case LTGT_EXPR: | |
4312 | if (!HONOR_NANS (TYPE_MODE (TREE_TYPE (arg1)))) | |
4313 | return pedantic_non_lvalue (fold_convert (type, arg1)); | |
4314 | break; | |
0023616d | 4315 | default: |
ce45a448 | 4316 | gcc_assert (TREE_CODE_CLASS (comp_code) == tcc_comparison); |
fe9b47eb | 4317 | break; |
0023616d | 4318 | } |
4319 | } | |
4320 | ||
4321 | /* If this is A op C1 ? A : C2 with C1 and C2 constant integers, | |
4322 | we might still be able to simplify this. For example, | |
4323 | if C1 is one less or one more than C2, this might have started | |
4324 | out as a MIN or MAX and been transformed by this function. | |
4325 | Only good for INTEGER_TYPEs, because we need TYPE_MAX_VALUE. */ | |
4326 | ||
4327 | if (INTEGRAL_TYPE_P (type) | |
4328 | && TREE_CODE (arg01) == INTEGER_CST | |
4329 | && TREE_CODE (arg2) == INTEGER_CST) | |
4330 | switch (comp_code) | |
4331 | { | |
4332 | case EQ_EXPR: | |
4333 | /* We can replace A with C1 in this case. */ | |
9b1fa4a0 | 4334 | arg1 = fold_convert (type, arg01); |
4335 | return fold (build3 (COND_EXPR, type, arg0, arg1, arg2)); | |
0023616d | 4336 | |
4337 | case LT_EXPR: | |
4338 | /* If C1 is C2 + 1, this is min(A, C2). */ | |
4339 | if (! operand_equal_p (arg2, TYPE_MAX_VALUE (type), | |
4340 | OEP_ONLY_CONST) | |
4341 | && operand_equal_p (arg01, | |
4342 | const_binop (PLUS_EXPR, arg2, | |
4343 | integer_one_node, 0), | |
4344 | OEP_ONLY_CONST)) | |
4345 | return pedantic_non_lvalue (fold (build2 (MIN_EXPR, | |
9b1fa4a0 | 4346 | type, arg1, arg2))); |
0023616d | 4347 | break; |
4348 | ||
4349 | case LE_EXPR: | |
4350 | /* If C1 is C2 - 1, this is min(A, C2). */ | |
4351 | if (! operand_equal_p (arg2, TYPE_MIN_VALUE (type), | |
4352 | OEP_ONLY_CONST) | |
4353 | && operand_equal_p (arg01, | |
4354 | const_binop (MINUS_EXPR, arg2, | |
4355 | integer_one_node, 0), | |
4356 | OEP_ONLY_CONST)) | |
4357 | return pedantic_non_lvalue (fold (build2 (MIN_EXPR, | |
9b1fa4a0 | 4358 | type, arg1, arg2))); |
0023616d | 4359 | break; |
4360 | ||
4361 | case GT_EXPR: | |
4362 | /* If C1 is C2 - 1, this is max(A, C2). */ | |
4363 | if (! operand_equal_p (arg2, TYPE_MIN_VALUE (type), | |
4364 | OEP_ONLY_CONST) | |
4365 | && operand_equal_p (arg01, | |
4366 | const_binop (MINUS_EXPR, arg2, | |
4367 | integer_one_node, 0), | |
4368 | OEP_ONLY_CONST)) | |
4369 | return pedantic_non_lvalue (fold (build2 (MAX_EXPR, | |
9b1fa4a0 | 4370 | type, arg1, arg2))); |
0023616d | 4371 | break; |
4372 | ||
4373 | case GE_EXPR: | |
4374 | /* If C1 is C2 + 1, this is max(A, C2). */ | |
4375 | if (! operand_equal_p (arg2, TYPE_MAX_VALUE (type), | |
4376 | OEP_ONLY_CONST) | |
4377 | && operand_equal_p (arg01, | |
4378 | const_binop (PLUS_EXPR, arg2, | |
4379 | integer_one_node, 0), | |
4380 | OEP_ONLY_CONST)) | |
4381 | return pedantic_non_lvalue (fold (build2 (MAX_EXPR, | |
9b1fa4a0 | 4382 | type, arg1, arg2))); |
0023616d | 4383 | break; |
4384 | case NE_EXPR: | |
4385 | break; | |
4386 | default: | |
fdada98f | 4387 | gcc_unreachable (); |
0023616d | 4388 | } |
4389 | ||
4390 | return NULL_TREE; | |
4391 | } | |
4392 | ||
4393 | ||
12ec0a8a | 4394 | \f |
17529f98 | 4395 | #ifndef LOGICAL_OP_NON_SHORT_CIRCUIT |
4396 | #define LOGICAL_OP_NON_SHORT_CIRCUIT (BRANCH_COST >= 2) | |
cf451ad8 | 4397 | #endif |
4398 | ||
12ec0a8a | 4399 | /* EXP is some logical combination of boolean tests. See if we can |
4400 | merge it into some range test. Return the new tree if so. */ | |
6f725368 | 4401 | |
12ec0a8a | 4402 | static tree |
de1b648b | 4403 | fold_range_test (tree exp) |
12ec0a8a | 4404 | { |
4405 | int or_op = (TREE_CODE (exp) == TRUTH_ORIF_EXPR | |
4406 | || TREE_CODE (exp) == TRUTH_OR_EXPR); | |
4407 | int in0_p, in1_p, in_p; | |
4408 | tree low0, low1, low, high0, high1, high; | |
4409 | tree lhs = make_range (TREE_OPERAND (exp, 0), &in0_p, &low0, &high0); | |
4410 | tree rhs = make_range (TREE_OPERAND (exp, 1), &in1_p, &low1, &high1); | |
4411 | tree tem; | |
6f725368 | 4412 | |
12ec0a8a | 4413 | /* If this is an OR operation, invert both sides; we will invert |
4414 | again at the end. */ | |
4415 | if (or_op) | |
4416 | in0_p = ! in0_p, in1_p = ! in1_p; | |
4417 | ||
4418 | /* If both expressions are the same, if we can merge the ranges, and we | |
f83854c8 | 4419 | can build the range test, return it or it inverted. If one of the |
4420 | ranges is always true or always false, consider it to be the same | |
4421 | expression as the other. */ | |
4422 | if ((lhs == 0 || rhs == 0 || operand_equal_p (lhs, rhs, 0)) | |
12ec0a8a | 4423 | && merge_ranges (&in_p, &low, &high, in0_p, low0, high0, |
4424 | in1_p, low1, high1) | |
f83854c8 | 4425 | && 0 != (tem = (build_range_check (TREE_TYPE (exp), |
4426 | lhs != 0 ? lhs | |
4427 | : rhs != 0 ? rhs : integer_zero_node, | |
12ec0a8a | 4428 | in_p, low, high)))) |
4429 | return or_op ? invert_truthvalue (tem) : tem; | |
4430 | ||
4431 | /* On machines where the branch cost is expensive, if this is a | |
4432 | short-circuited branch and the underlying object on both sides | |
4433 | is the same, make a non-short-circuit operation. */ | |
17529f98 | 4434 | else if (LOGICAL_OP_NON_SHORT_CIRCUIT |
1fdbc76b | 4435 | && lhs != 0 && rhs != 0 |
12ec0a8a | 4436 | && (TREE_CODE (exp) == TRUTH_ANDIF_EXPR |
4437 | || TREE_CODE (exp) == TRUTH_ORIF_EXPR) | |
4438 | && operand_equal_p (lhs, rhs, 0)) | |
6f725368 | 4439 | { |
90a73592 | 4440 | /* If simple enough, just rewrite. Otherwise, make a SAVE_EXPR |
9e042f31 | 4441 | unless we are at top level or LHS contains a PLACEHOLDER_EXPR, in |
4442 | which cases we can't do this. */ | |
12ec0a8a | 4443 | if (simple_operand_p (lhs)) |
fd96eeef | 4444 | return build2 (TREE_CODE (exp) == TRUTH_ANDIF_EXPR |
4445 | ? TRUTH_AND_EXPR : TRUTH_OR_EXPR, | |
4446 | TREE_TYPE (exp), TREE_OPERAND (exp, 0), | |
4447 | TREE_OPERAND (exp, 1)); | |
90a73592 | 4448 | |
fa8b888f | 4449 | else if (lang_hooks.decls.global_bindings_p () == 0 |
ce3fb06e | 4450 | && ! CONTAINS_PLACEHOLDER_P (lhs)) |
12ec0a8a | 4451 | { |
4452 | tree common = save_expr (lhs); | |
4453 | ||
4454 | if (0 != (lhs = build_range_check (TREE_TYPE (exp), common, | |
4455 | or_op ? ! in0_p : in0_p, | |
4456 | low0, high0)) | |
4457 | && (0 != (rhs = build_range_check (TREE_TYPE (exp), common, | |
4458 | or_op ? ! in1_p : in1_p, | |
4459 | low1, high1)))) | |
fd96eeef | 4460 | return build2 (TREE_CODE (exp) == TRUTH_ANDIF_EXPR |
4461 | ? TRUTH_AND_EXPR : TRUTH_OR_EXPR, | |
4462 | TREE_TYPE (exp), lhs, rhs); | |
12ec0a8a | 4463 | } |
6f725368 | 4464 | } |
831e3af4 | 4465 | |
831e3af4 | 4466 | return 0; |
6f725368 | 4467 | } |
4468 | \f | |
94f29e88 | 4469 | /* Subroutine for fold_truthop: C is an INTEGER_CST interpreted as a P |
b2dcfbf7 | 4470 | bit value. Arrange things so the extra bits will be set to zero if and |
2a6329ae | 4471 | only if C is signed-extended to its full width. If MASK is nonzero, |
4472 | it is an INTEGER_CST that should be AND'ed with the extra bits. */ | |
94f29e88 | 4473 | |
4474 | static tree | |
de1b648b | 4475 | unextend (tree c, int p, int unsignedp, tree mask) |
94f29e88 | 4476 | { |
4477 | tree type = TREE_TYPE (c); | |
4478 | int modesize = GET_MODE_BITSIZE (TYPE_MODE (type)); | |
4479 | tree temp; | |
4480 | ||
4481 | if (p == modesize || unsignedp) | |
4482 | return c; | |
4483 | ||
94f29e88 | 4484 | /* We work by getting just the sign bit into the low-order bit, then |
c3418f42 | 4485 | into the high-order bit, then sign-extend. We then XOR that value |
94f29e88 | 4486 | with C. */ |
4487 | temp = const_binop (RSHIFT_EXPR, c, size_int (p - 1), 0); | |
4488 | temp = const_binop (BIT_AND_EXPR, temp, size_int (1), 0); | |
dd5f6dae | 4489 | |
4490 | /* We must use a signed type in order to get an arithmetic right shift. | |
4491 | However, we must also avoid introducing accidental overflows, so that | |
cc049fa3 | 4492 | a subsequent call to integer_zerop will work. Hence we must |
dd5f6dae | 4493 | do the type conversion here. At this point, the constant is either |
4494 | zero or one, and the conversion to a signed type can never overflow. | |
4495 | We could get an overflow if this conversion is done anywhere else. */ | |
78a8ed03 | 4496 | if (TYPE_UNSIGNED (type)) |
fa8b888f | 4497 | temp = fold_convert (lang_hooks.types.signed_type (type), temp); |
dd5f6dae | 4498 | |
94f29e88 | 4499 | temp = const_binop (LSHIFT_EXPR, temp, size_int (modesize - 1), 0); |
4500 | temp = const_binop (RSHIFT_EXPR, temp, size_int (modesize - p - 1), 0); | |
2a6329ae | 4501 | if (mask != 0) |
b30e3dbc | 4502 | temp = const_binop (BIT_AND_EXPR, temp, |
4503 | fold_convert (TREE_TYPE (c), mask), 0); | |
dd5f6dae | 4504 | /* If necessary, convert the type back to match the type of C. */ |
78a8ed03 | 4505 | if (TYPE_UNSIGNED (type)) |
b30e3dbc | 4506 | temp = fold_convert (type, temp); |
2a6329ae | 4507 | |
b30e3dbc | 4508 | return fold_convert (type, const_binop (BIT_XOR_EXPR, c, temp, 0)); |
94f29e88 | 4509 | } |
4510 | \f | |
79109eec | 4511 | /* Find ways of folding logical expressions of LHS and RHS: |
4512 | Try to merge two comparisons to the same innermost item. | |
4513 | Look for range tests like "ch >= '0' && ch <= '9'". | |
4514 | Look for combinations of simple terms on machines with expensive branches | |
4515 | and evaluate the RHS unconditionally. | |
2bc77e10 | 4516 | |
4517 | For example, if we have p->a == 2 && p->b == 4 and we can make an | |
4518 | object large enough to span both A and B, we can do this with a comparison | |
4519 | against the object ANDed with the a mask. | |
4520 | ||
4521 | If we have p->a == q->a && p->b == q->b, we may be able to use bit masking | |
4522 | operations to do this with one comparison. | |
4523 | ||
4524 | We check for both normal comparisons and the BIT_AND_EXPRs made this by | |
4525 | function and the one above. | |
4526 | ||
4527 | CODE is the logical operation being done. It can be TRUTH_ANDIF_EXPR, | |
4528 | TRUTH_AND_EXPR, TRUTH_ORIF_EXPR, or TRUTH_OR_EXPR. | |
4529 | ||
4530 | TRUTH_TYPE is the type of the logical operand and LHS and RHS are its | |
4531 | two operands. | |
4532 | ||
4533 | We return the simplified tree or 0 if no optimization is possible. */ | |
4534 | ||
4535 | static tree | |
de1b648b | 4536 | fold_truthop (enum tree_code code, tree truth_type, tree lhs, tree rhs) |
2bc77e10 | 4537 | { |
62af9abe | 4538 | /* If this is the "or" of two comparisons, we can do something if |
2bc77e10 | 4539 | the comparisons are NE_EXPR. If this is the "and", we can do something |
cc049fa3 | 4540 | if the comparisons are EQ_EXPR. I.e., |
de1b648b | 4541 | (a->b == 2 && a->c == 4) can become (a->new == NEW). |
2bc77e10 | 4542 | |
4543 | WANTED_CODE is this operation code. For single bit fields, we can | |
4544 | convert EQ_EXPR to NE_EXPR so we need not reject the "wrong" | |
4545 | comparison for one-bit fields. */ | |
4546 | ||
79109eec | 4547 | enum tree_code wanted_code; |
2bc77e10 | 4548 | enum tree_code lcode, rcode; |
79109eec | 4549 | tree ll_arg, lr_arg, rl_arg, rr_arg; |
2bc77e10 | 4550 | tree ll_inner, lr_inner, rl_inner, rr_inner; |
02e7a332 | 4551 | HOST_WIDE_INT ll_bitsize, ll_bitpos, lr_bitsize, lr_bitpos; |
4552 | HOST_WIDE_INT rl_bitsize, rl_bitpos, rr_bitsize, rr_bitpos; | |
4553 | HOST_WIDE_INT xll_bitpos, xlr_bitpos, xrl_bitpos, xrr_bitpos; | |
4554 | HOST_WIDE_INT lnbitsize, lnbitpos, rnbitsize, rnbitpos; | |
2bc77e10 | 4555 | int ll_unsignedp, lr_unsignedp, rl_unsignedp, rr_unsignedp; |
4556 | enum machine_mode ll_mode, lr_mode, rl_mode, rr_mode; | |
4557 | enum machine_mode lnmode, rnmode; | |
4558 | tree ll_mask, lr_mask, rl_mask, rr_mask; | |
2a6329ae | 4559 | tree ll_and_mask, lr_and_mask, rl_and_mask, rr_and_mask; |
79109eec | 4560 | tree l_const, r_const; |
ffba564c | 4561 | tree lntype, rntype, result; |
2bc77e10 | 4562 | int first_bit, end_bit; |
79109eec | 4563 | int volatilep; |
2bc77e10 | 4564 | |
12ec0a8a | 4565 | /* Start by getting the comparison codes. Fail if anything is volatile. |
4566 | If one operand is a BIT_AND_EXPR with the constant one, treat it as if | |
4567 | it were surrounded with a NE_EXPR. */ | |
2bc77e10 | 4568 | |
12ec0a8a | 4569 | if (TREE_SIDE_EFFECTS (lhs) || TREE_SIDE_EFFECTS (rhs)) |
79109eec | 4570 | return 0; |
4571 | ||
2bc77e10 | 4572 | lcode = TREE_CODE (lhs); |
4573 | rcode = TREE_CODE (rhs); | |
6f725368 | 4574 | |
b5ab1edd | 4575 | if (lcode == BIT_AND_EXPR && integer_onep (TREE_OPERAND (lhs, 1))) |
fd96eeef | 4576 | { |
5c9198bd | 4577 | lhs = build2 (NE_EXPR, truth_type, lhs, |
4578 | fold_convert (TREE_TYPE (lhs), integer_zero_node)); | |
fd96eeef | 4579 | lcode = NE_EXPR; |
4580 | } | |
b5ab1edd | 4581 | |
4582 | if (rcode == BIT_AND_EXPR && integer_onep (TREE_OPERAND (rhs, 1))) | |
fd96eeef | 4583 | { |
5c9198bd | 4584 | rhs = build2 (NE_EXPR, truth_type, rhs, |
4585 | fold_convert (TREE_TYPE (rhs), integer_zero_node)); | |
fd96eeef | 4586 | rcode = NE_EXPR; |
4587 | } | |
b5ab1edd | 4588 | |
ce45a448 | 4589 | if (TREE_CODE_CLASS (lcode) != tcc_comparison |
4590 | || TREE_CODE_CLASS (rcode) != tcc_comparison) | |
6f725368 | 4591 | return 0; |
4592 | ||
79109eec | 4593 | ll_arg = TREE_OPERAND (lhs, 0); |
4594 | lr_arg = TREE_OPERAND (lhs, 1); | |
4595 | rl_arg = TREE_OPERAND (rhs, 0); | |
4596 | rr_arg = TREE_OPERAND (rhs, 1); | |
cc049fa3 | 4597 | |
7835f163 | 4598 | /* Simplify (x<y) && (x==y) into (x<=y) and related optimizations. */ |
4599 | if (simple_operand_p (ll_arg) | |
318a728f | 4600 | && simple_operand_p (lr_arg)) |
7835f163 | 4601 | { |
318a728f | 4602 | tree result; |
7835f163 | 4603 | if (operand_equal_p (ll_arg, rl_arg, 0) |
4604 | && operand_equal_p (lr_arg, rr_arg, 0)) | |
318a728f | 4605 | { |
4606 | result = combine_comparisons (code, lcode, rcode, | |
4607 | truth_type, ll_arg, lr_arg); | |
4608 | if (result) | |
4609 | return result; | |
4610 | } | |
7835f163 | 4611 | else if (operand_equal_p (ll_arg, rr_arg, 0) |
4612 | && operand_equal_p (lr_arg, rl_arg, 0)) | |
318a728f | 4613 | { |
4614 | result = combine_comparisons (code, lcode, | |
4615 | swap_tree_comparison (rcode), | |
4616 | truth_type, ll_arg, lr_arg); | |
4617 | if (result) | |
4618 | return result; | |
4619 | } | |
7835f163 | 4620 | } |
4621 | ||
318a728f | 4622 | code = ((code == TRUTH_AND_EXPR || code == TRUTH_ANDIF_EXPR) |
4623 | ? TRUTH_AND_EXPR : TRUTH_OR_EXPR); | |
4624 | ||
7735dddb | 4625 | /* If the RHS can be evaluated unconditionally and its operands are |
79109eec | 4626 | simple, it wins to evaluate the RHS unconditionally on machines |
4627 | with expensive branches. In this case, this isn't a comparison | |
35212e61 | 4628 | that can be merged. Avoid doing this if the RHS is a floating-point |
4629 | comparison since those can trap. */ | |
79109eec | 4630 | |
4631 | if (BRANCH_COST >= 2 | |
35212e61 | 4632 | && ! FLOAT_TYPE_P (TREE_TYPE (rl_arg)) |
79109eec | 4633 | && simple_operand_p (rl_arg) |
7735dddb | 4634 | && simple_operand_p (rr_arg)) |
0425437e | 4635 | { |
4636 | /* Convert (a != 0) || (b != 0) into (a | b) != 0. */ | |
4637 | if (code == TRUTH_OR_EXPR | |
4638 | && lcode == NE_EXPR && integer_zerop (lr_arg) | |
4639 | && rcode == NE_EXPR && integer_zerop (rr_arg) | |
4640 | && TREE_TYPE (ll_arg) == TREE_TYPE (rl_arg)) | |
fd96eeef | 4641 | return build2 (NE_EXPR, truth_type, |
4642 | build2 (BIT_IOR_EXPR, TREE_TYPE (ll_arg), | |
4643 | ll_arg, rl_arg), | |
20783f07 | 4644 | fold_convert (TREE_TYPE (ll_arg), integer_zero_node)); |
0425437e | 4645 | |
4646 | /* Convert (a == 0) && (b == 0) into (a | b) == 0. */ | |
4647 | if (code == TRUTH_AND_EXPR | |
4648 | && lcode == EQ_EXPR && integer_zerop (lr_arg) | |
4649 | && rcode == EQ_EXPR && integer_zerop (rr_arg) | |
4650 | && TREE_TYPE (ll_arg) == TREE_TYPE (rl_arg)) | |
fd96eeef | 4651 | return build2 (EQ_EXPR, truth_type, |
4652 | build2 (BIT_IOR_EXPR, TREE_TYPE (ll_arg), | |
4653 | ll_arg, rl_arg), | |
20783f07 | 4654 | fold_convert (TREE_TYPE (ll_arg), integer_zero_node)); |
0425437e | 4655 | |
17529f98 | 4656 | if (LOGICAL_OP_NON_SHORT_CIRCUIT) |
4657 | return build2 (code, truth_type, lhs, rhs); | |
0425437e | 4658 | } |
79109eec | 4659 | |
6f725368 | 4660 | /* See if the comparisons can be merged. Then get all the parameters for |
4661 | each side. */ | |
4662 | ||
2bc77e10 | 4663 | if ((lcode != EQ_EXPR && lcode != NE_EXPR) |
6f725368 | 4664 | || (rcode != EQ_EXPR && rcode != NE_EXPR)) |
2bc77e10 | 4665 | return 0; |
4666 | ||
79109eec | 4667 | volatilep = 0; |
4668 | ll_inner = decode_field_reference (ll_arg, | |
2bc77e10 | 4669 | &ll_bitsize, &ll_bitpos, &ll_mode, |
2a6329ae | 4670 | &ll_unsignedp, &volatilep, &ll_mask, |
4671 | &ll_and_mask); | |
79109eec | 4672 | lr_inner = decode_field_reference (lr_arg, |
2bc77e10 | 4673 | &lr_bitsize, &lr_bitpos, &lr_mode, |
2a6329ae | 4674 | &lr_unsignedp, &volatilep, &lr_mask, |
4675 | &lr_and_mask); | |
79109eec | 4676 | rl_inner = decode_field_reference (rl_arg, |
2bc77e10 | 4677 | &rl_bitsize, &rl_bitpos, &rl_mode, |
2a6329ae | 4678 | &rl_unsignedp, &volatilep, &rl_mask, |
4679 | &rl_and_mask); | |
79109eec | 4680 | rr_inner = decode_field_reference (rr_arg, |
2bc77e10 | 4681 | &rr_bitsize, &rr_bitpos, &rr_mode, |
2a6329ae | 4682 | &rr_unsignedp, &volatilep, &rr_mask, |
4683 | &rr_and_mask); | |
2bc77e10 | 4684 | |
4685 | /* It must be true that the inner operation on the lhs of each | |
4686 | comparison must be the same if we are to be able to do anything. | |
4687 | Then see if we have constants. If not, the same must be true for | |
4688 | the rhs's. */ | |
4689 | if (volatilep || ll_inner == 0 || rl_inner == 0 | |
4690 | || ! operand_equal_p (ll_inner, rl_inner, 0)) | |
4691 | return 0; | |
4692 | ||
79109eec | 4693 | if (TREE_CODE (lr_arg) == INTEGER_CST |
4694 | && TREE_CODE (rr_arg) == INTEGER_CST) | |
4695 | l_const = lr_arg, r_const = rr_arg; | |
2bc77e10 | 4696 | else if (lr_inner == 0 || rr_inner == 0 |
4697 | || ! operand_equal_p (lr_inner, rr_inner, 0)) | |
4698 | return 0; | |
79109eec | 4699 | else |
4700 | l_const = r_const = 0; | |
2bc77e10 | 4701 | |
4702 | /* If either comparison code is not correct for our logical operation, | |
4703 | fail. However, we can convert a one-bit comparison against zero into | |
4704 | the opposite comparison against that bit being set in the field. */ | |
79109eec | 4705 | |
76e4a18b | 4706 | wanted_code = (code == TRUTH_AND_EXPR ? EQ_EXPR : NE_EXPR); |
2bc77e10 | 4707 | if (lcode != wanted_code) |
4708 | { | |
4709 | if (l_const && integer_zerop (l_const) && integer_pow2p (ll_mask)) | |
c6107ab0 | 4710 | { |
28bb328d | 4711 | /* Make the left operand unsigned, since we are only interested |
4712 | in the value of one bit. Otherwise we are doing the wrong | |
4713 | thing below. */ | |
4714 | ll_unsignedp = 1; | |
68ae709d | 4715 | l_const = ll_mask; |
c6107ab0 | 4716 | } |
2bc77e10 | 4717 | else |
4718 | return 0; | |
4719 | } | |
4720 | ||
68ae709d | 4721 | /* This is analogous to the code for l_const above. */ |
2bc77e10 | 4722 | if (rcode != wanted_code) |
4723 | { | |
4724 | if (r_const && integer_zerop (r_const) && integer_pow2p (rl_mask)) | |
c6107ab0 | 4725 | { |
28bb328d | 4726 | rl_unsignedp = 1; |
68ae709d | 4727 | r_const = rl_mask; |
c6107ab0 | 4728 | } |
2bc77e10 | 4729 | else |
4730 | return 0; | |
4731 | } | |
4732 | ||
d50b22af | 4733 | /* After this point all optimizations will generate bit-field |
4734 | references, which we might not want. */ | |
fa8b888f | 4735 | if (! lang_hooks.can_use_bit_fields_p ()) |
d50b22af | 4736 | return 0; |
4737 | ||
2bc77e10 | 4738 | /* See if we can find a mode that contains both fields being compared on |
4739 | the left. If we can't, fail. Otherwise, update all constants and masks | |
4740 | to be relative to a field of that size. */ | |
4741 | first_bit = MIN (ll_bitpos, rl_bitpos); | |
4742 | end_bit = MAX (ll_bitpos + ll_bitsize, rl_bitpos + rl_bitsize); | |
4743 | lnmode = get_best_mode (end_bit - first_bit, first_bit, | |
4744 | TYPE_ALIGN (TREE_TYPE (ll_inner)), word_mode, | |
4745 | volatilep); | |
4746 | if (lnmode == VOIDmode) | |
4747 | return 0; | |
4748 | ||
4749 | lnbitsize = GET_MODE_BITSIZE (lnmode); | |
4750 | lnbitpos = first_bit & ~ (lnbitsize - 1); | |
fa8b888f | 4751 | lntype = lang_hooks.types.type_for_size (lnbitsize, 1); |
2bc77e10 | 4752 | xll_bitpos = ll_bitpos - lnbitpos, xrl_bitpos = rl_bitpos - lnbitpos; |
4753 | ||
51356f86 | 4754 | if (BYTES_BIG_ENDIAN) |
4755 | { | |
4756 | xll_bitpos = lnbitsize - xll_bitpos - ll_bitsize; | |
4757 | xrl_bitpos = lnbitsize - xrl_bitpos - rl_bitsize; | |
4758 | } | |
2bc77e10 | 4759 | |
b30e3dbc | 4760 | ll_mask = const_binop (LSHIFT_EXPR, fold_convert (lntype, ll_mask), |
5485823f | 4761 | size_int (xll_bitpos), 0); |
b30e3dbc | 4762 | rl_mask = const_binop (LSHIFT_EXPR, fold_convert (lntype, rl_mask), |
5485823f | 4763 | size_int (xrl_bitpos), 0); |
2bc77e10 | 4764 | |
2bc77e10 | 4765 | if (l_const) |
4766 | { | |
b30e3dbc | 4767 | l_const = fold_convert (lntype, l_const); |
cc049fa3 | 4768 | l_const = unextend (l_const, ll_bitsize, ll_unsignedp, ll_and_mask); |
94f29e88 | 4769 | l_const = const_binop (LSHIFT_EXPR, l_const, size_int (xll_bitpos), 0); |
4770 | if (! integer_zerop (const_binop (BIT_AND_EXPR, l_const, | |
4771 | fold (build1 (BIT_NOT_EXPR, | |
ffba564c | 4772 | lntype, ll_mask)), |
94f29e88 | 4773 | 0))) |
4774 | { | |
be2828ce | 4775 | warning ("comparison is always %d", wanted_code == NE_EXPR); |
cc049fa3 | 4776 | |
20783f07 | 4777 | return constant_boolean_node (wanted_code == NE_EXPR, truth_type); |
94f29e88 | 4778 | } |
2bc77e10 | 4779 | } |
4780 | if (r_const) | |
4781 | { | |
b30e3dbc | 4782 | r_const = fold_convert (lntype, r_const); |
2a6329ae | 4783 | r_const = unextend (r_const, rl_bitsize, rl_unsignedp, rl_and_mask); |
94f29e88 | 4784 | r_const = const_binop (LSHIFT_EXPR, r_const, size_int (xrl_bitpos), 0); |
4785 | if (! integer_zerop (const_binop (BIT_AND_EXPR, r_const, | |
4786 | fold (build1 (BIT_NOT_EXPR, | |
ffba564c | 4787 | lntype, rl_mask)), |
94f29e88 | 4788 | 0))) |
4789 | { | |
be2828ce | 4790 | warning ("comparison is always %d", wanted_code == NE_EXPR); |
4791 | ||
20783f07 | 4792 | return constant_boolean_node (wanted_code == NE_EXPR, truth_type); |
94f29e88 | 4793 | } |
2bc77e10 | 4794 | } |
4795 | ||
4796 | /* If the right sides are not constant, do the same for it. Also, | |
4797 | disallow this optimization if a size or signedness mismatch occurs | |
4798 | between the left and right sides. */ | |
4799 | if (l_const == 0) | |
4800 | { | |
4801 | if (ll_bitsize != lr_bitsize || rl_bitsize != rr_bitsize | |
15e4fe21 | 4802 | || ll_unsignedp != lr_unsignedp || rl_unsignedp != rr_unsignedp |
4803 | /* Make sure the two fields on the right | |
4804 | correspond to the left without being swapped. */ | |
4805 | || ll_bitpos - rl_bitpos != lr_bitpos - rr_bitpos) | |
2bc77e10 | 4806 | return 0; |
4807 | ||
4808 | first_bit = MIN (lr_bitpos, rr_bitpos); | |
4809 | end_bit = MAX (lr_bitpos + lr_bitsize, rr_bitpos + rr_bitsize); | |
4810 | rnmode = get_best_mode (end_bit - first_bit, first_bit, | |
4811 | TYPE_ALIGN (TREE_TYPE (lr_inner)), word_mode, | |
4812 | volatilep); | |
4813 | if (rnmode == VOIDmode) | |
4814 | return 0; | |
4815 | ||
4816 | rnbitsize = GET_MODE_BITSIZE (rnmode); | |
4817 | rnbitpos = first_bit & ~ (rnbitsize - 1); | |
fa8b888f | 4818 | rntype = lang_hooks.types.type_for_size (rnbitsize, 1); |
2bc77e10 | 4819 | xlr_bitpos = lr_bitpos - rnbitpos, xrr_bitpos = rr_bitpos - rnbitpos; |
4820 | ||
51356f86 | 4821 | if (BYTES_BIG_ENDIAN) |
4822 | { | |
4823 | xlr_bitpos = rnbitsize - xlr_bitpos - lr_bitsize; | |
4824 | xrr_bitpos = rnbitsize - xrr_bitpos - rr_bitsize; | |
4825 | } | |
2bc77e10 | 4826 | |
b30e3dbc | 4827 | lr_mask = const_binop (LSHIFT_EXPR, fold_convert (rntype, lr_mask), |
5485823f | 4828 | size_int (xlr_bitpos), 0); |
b30e3dbc | 4829 | rr_mask = const_binop (LSHIFT_EXPR, fold_convert (rntype, rr_mask), |
5485823f | 4830 | size_int (xrr_bitpos), 0); |
2bc77e10 | 4831 | |
4832 | /* Make a mask that corresponds to both fields being compared. | |
00ee0921 | 4833 | Do this for both items being compared. If the operands are the |
4834 | same size and the bits being compared are in the same position | |
4835 | then we can do this by masking both and comparing the masked | |
4836 | results. */ | |
5485823f | 4837 | ll_mask = const_binop (BIT_IOR_EXPR, ll_mask, rl_mask, 0); |
4838 | lr_mask = const_binop (BIT_IOR_EXPR, lr_mask, rr_mask, 0); | |
00ee0921 | 4839 | if (lnbitsize == rnbitsize && xll_bitpos == xlr_bitpos) |
2bc77e10 | 4840 | { |
ffba564c | 4841 | lhs = make_bit_field_ref (ll_inner, lntype, lnbitsize, lnbitpos, |
2bc77e10 | 4842 | ll_unsignedp || rl_unsignedp); |
00ee0921 | 4843 | if (! all_ones_mask_p (ll_mask, lnbitsize)) |
fd96eeef | 4844 | lhs = build2 (BIT_AND_EXPR, lntype, lhs, ll_mask); |
00ee0921 | 4845 | |
ffba564c | 4846 | rhs = make_bit_field_ref (lr_inner, rntype, rnbitsize, rnbitpos, |
2bc77e10 | 4847 | lr_unsignedp || rr_unsignedp); |
00ee0921 | 4848 | if (! all_ones_mask_p (lr_mask, rnbitsize)) |
fd96eeef | 4849 | rhs = build2 (BIT_AND_EXPR, rntype, rhs, lr_mask); |
00ee0921 | 4850 | |
fd96eeef | 4851 | return build2 (wanted_code, truth_type, lhs, rhs); |
2bc77e10 | 4852 | } |
4853 | ||
4854 | /* There is still another way we can do something: If both pairs of | |
4855 | fields being compared are adjacent, we may be able to make a wider | |
4cf66b97 | 4856 | field containing them both. |
4857 | ||
4858 | Note that we still must mask the lhs/rhs expressions. Furthermore, | |
cc049fa3 | 4859 | the mask must be shifted to account for the shift done by |
4cf66b97 | 4860 | make_bit_field_ref. */ |
2bc77e10 | 4861 | if ((ll_bitsize + ll_bitpos == rl_bitpos |
4862 | && lr_bitsize + lr_bitpos == rr_bitpos) | |
4863 | || (ll_bitpos == rl_bitpos + rl_bitsize | |
4864 | && lr_bitpos == rr_bitpos + rr_bitsize)) | |
4cf66b97 | 4865 | { |
ffba564c | 4866 | tree type; |
4867 | ||
4868 | lhs = make_bit_field_ref (ll_inner, lntype, ll_bitsize + rl_bitsize, | |
4cf66b97 | 4869 | MIN (ll_bitpos, rl_bitpos), ll_unsignedp); |
ffba564c | 4870 | rhs = make_bit_field_ref (lr_inner, rntype, lr_bitsize + rr_bitsize, |
4871 | MIN (lr_bitpos, rr_bitpos), lr_unsignedp); | |
4872 | ||
4cf66b97 | 4873 | ll_mask = const_binop (RSHIFT_EXPR, ll_mask, |
4874 | size_int (MIN (xll_bitpos, xrl_bitpos)), 0); | |
ffba564c | 4875 | lr_mask = const_binop (RSHIFT_EXPR, lr_mask, |
4876 | size_int (MIN (xlr_bitpos, xrr_bitpos)), 0); | |
4877 | ||
4878 | /* Convert to the smaller type before masking out unwanted bits. */ | |
4879 | type = lntype; | |
4880 | if (lntype != rntype) | |
4881 | { | |
4882 | if (lnbitsize > rnbitsize) | |
4883 | { | |
b30e3dbc | 4884 | lhs = fold_convert (rntype, lhs); |
4885 | ll_mask = fold_convert (rntype, ll_mask); | |
ffba564c | 4886 | type = rntype; |
4887 | } | |
4888 | else if (lnbitsize < rnbitsize) | |
4889 | { | |
b30e3dbc | 4890 | rhs = fold_convert (lntype, rhs); |
4891 | lr_mask = fold_convert (lntype, lr_mask); | |
ffba564c | 4892 | type = lntype; |
4893 | } | |
4894 | } | |
4895 | ||
4cf66b97 | 4896 | if (! all_ones_mask_p (ll_mask, ll_bitsize + rl_bitsize)) |
fd96eeef | 4897 | lhs = build2 (BIT_AND_EXPR, type, lhs, ll_mask); |
4cf66b97 | 4898 | |
4cf66b97 | 4899 | if (! all_ones_mask_p (lr_mask, lr_bitsize + rr_bitsize)) |
fd96eeef | 4900 | rhs = build2 (BIT_AND_EXPR, type, rhs, lr_mask); |
4cf66b97 | 4901 | |
fd96eeef | 4902 | return build2 (wanted_code, truth_type, lhs, rhs); |
4cf66b97 | 4903 | } |
2bc77e10 | 4904 | |
4905 | return 0; | |
4906 | } | |
4907 | ||
4908 | /* Handle the case of comparisons with constants. If there is something in | |
4909 | common between the masks, those bits of the constants must be the same. | |
4910 | If not, the condition is always false. Test for this to avoid generating | |
4911 | incorrect code below. */ | |
5485823f | 4912 | result = const_binop (BIT_AND_EXPR, ll_mask, rl_mask, 0); |
2bc77e10 | 4913 | if (! integer_zerop (result) |
5485823f | 4914 | && simple_cst_equal (const_binop (BIT_AND_EXPR, result, l_const, 0), |
4915 | const_binop (BIT_AND_EXPR, result, r_const, 0)) != 1) | |
2bc77e10 | 4916 | { |
4917 | if (wanted_code == NE_EXPR) | |
4918 | { | |
eb586f2c | 4919 | warning ("%<or%> of unmatched not-equal tests is always 1"); |
20783f07 | 4920 | return constant_boolean_node (true, truth_type); |
2bc77e10 | 4921 | } |
4922 | else | |
4923 | { | |
eb586f2c | 4924 | warning ("%<and%> of mutually exclusive equal-tests is always 0"); |
20783f07 | 4925 | return constant_boolean_node (false, truth_type); |
2bc77e10 | 4926 | } |
4927 | } | |
4928 | ||
4929 | /* Construct the expression we will return. First get the component | |
4930 | reference we will make. Unless the mask is all ones the width of | |
4931 | that field, perform the mask operation. Then compare with the | |
4932 | merged constant. */ | |
ffba564c | 4933 | result = make_bit_field_ref (ll_inner, lntype, lnbitsize, lnbitpos, |
2bc77e10 | 4934 | ll_unsignedp || rl_unsignedp); |
4935 | ||
5485823f | 4936 | ll_mask = const_binop (BIT_IOR_EXPR, ll_mask, rl_mask, 0); |
2bc77e10 | 4937 | if (! all_ones_mask_p (ll_mask, lnbitsize)) |
fd96eeef | 4938 | result = build2 (BIT_AND_EXPR, lntype, result, ll_mask); |
2bc77e10 | 4939 | |
fd96eeef | 4940 | return build2 (wanted_code, truth_type, result, |
4941 | const_binop (BIT_IOR_EXPR, l_const, r_const, 0)); | |
2bc77e10 | 4942 | } |
4943 | \f | |
cc049fa3 | 4944 | /* Optimize T, which is a comparison of a MIN_EXPR or MAX_EXPR with a |
155b05dc | 4945 | constant. */ |
4946 | ||
4947 | static tree | |
de1b648b | 4948 | optimize_minmax_comparison (tree t) |
155b05dc | 4949 | { |
4950 | tree type = TREE_TYPE (t); | |
4951 | tree arg0 = TREE_OPERAND (t, 0); | |
4952 | enum tree_code op_code; | |
4953 | tree comp_const = TREE_OPERAND (t, 1); | |
4954 | tree minmax_const; | |
4955 | int consts_equal, consts_lt; | |
4956 | tree inner; | |
4957 | ||
4958 | STRIP_SIGN_NOPS (arg0); | |
4959 | ||
4960 | op_code = TREE_CODE (arg0); | |
4961 | minmax_const = TREE_OPERAND (arg0, 1); | |
4962 | consts_equal = tree_int_cst_equal (minmax_const, comp_const); | |
4963 | consts_lt = tree_int_cst_lt (minmax_const, comp_const); | |
4964 | inner = TREE_OPERAND (arg0, 0); | |
4965 | ||
4966 | /* If something does not permit us to optimize, return the original tree. */ | |
4967 | if ((op_code != MIN_EXPR && op_code != MAX_EXPR) | |
4968 | || TREE_CODE (comp_const) != INTEGER_CST | |
4969 | || TREE_CONSTANT_OVERFLOW (comp_const) | |
4970 | || TREE_CODE (minmax_const) != INTEGER_CST | |
4971 | || TREE_CONSTANT_OVERFLOW (minmax_const)) | |
4972 | return t; | |
4973 | ||
4974 | /* Now handle all the various comparison codes. We only handle EQ_EXPR | |
4975 | and GT_EXPR, doing the rest with recursive calls using logical | |
4976 | simplifications. */ | |
4977 | switch (TREE_CODE (t)) | |
4978 | { | |
4979 | case NE_EXPR: case LT_EXPR: case LE_EXPR: | |
4980 | return | |
4981 | invert_truthvalue (optimize_minmax_comparison (invert_truthvalue (t))); | |
4982 | ||
4983 | case GE_EXPR: | |
4984 | return | |
fd96eeef | 4985 | fold (build2 (TRUTH_ORIF_EXPR, type, |
4986 | optimize_minmax_comparison | |
4987 | (build2 (EQ_EXPR, type, arg0, comp_const)), | |
4988 | optimize_minmax_comparison | |
4989 | (build2 (GT_EXPR, type, arg0, comp_const)))); | |
155b05dc | 4990 | |
4991 | case EQ_EXPR: | |
4992 | if (op_code == MAX_EXPR && consts_equal) | |
4993 | /* MAX (X, 0) == 0 -> X <= 0 */ | |
fd96eeef | 4994 | return fold (build2 (LE_EXPR, type, inner, comp_const)); |
155b05dc | 4995 | |
4996 | else if (op_code == MAX_EXPR && consts_lt) | |
4997 | /* MAX (X, 0) == 5 -> X == 5 */ | |
fd96eeef | 4998 | return fold (build2 (EQ_EXPR, type, inner, comp_const)); |
155b05dc | 4999 | |
5000 | else if (op_code == MAX_EXPR) | |
5001 | /* MAX (X, 0) == -1 -> false */ | |
5002 | return omit_one_operand (type, integer_zero_node, inner); | |
5003 | ||
5004 | else if (consts_equal) | |
5005 | /* MIN (X, 0) == 0 -> X >= 0 */ | |
fd96eeef | 5006 | return fold (build2 (GE_EXPR, type, inner, comp_const)); |
155b05dc | 5007 | |
5008 | else if (consts_lt) | |
5009 | /* MIN (X, 0) == 5 -> false */ | |
5010 | return omit_one_operand (type, integer_zero_node, inner); | |
5011 | ||
5012 | else | |
5013 | /* MIN (X, 0) == -1 -> X == -1 */ | |
fd96eeef | 5014 | return fold (build2 (EQ_EXPR, type, inner, comp_const)); |
155b05dc | 5015 | |
5016 | case GT_EXPR: | |
5017 | if (op_code == MAX_EXPR && (consts_equal || consts_lt)) | |
5018 | /* MAX (X, 0) > 0 -> X > 0 | |
5019 | MAX (X, 0) > 5 -> X > 5 */ | |
fd96eeef | 5020 | return fold (build2 (GT_EXPR, type, inner, comp_const)); |
155b05dc | 5021 | |
5022 | else if (op_code == MAX_EXPR) | |
5023 | /* MAX (X, 0) > -1 -> true */ | |
5024 | return omit_one_operand (type, integer_one_node, inner); | |
5025 | ||
5026 | else if (op_code == MIN_EXPR && (consts_equal || consts_lt)) | |
5027 | /* MIN (X, 0) > 0 -> false | |
5028 | MIN (X, 0) > 5 -> false */ | |
5029 | return omit_one_operand (type, integer_zero_node, inner); | |
5030 | ||
5031 | else | |
5032 | /* MIN (X, 0) > -1 -> X > -1 */ | |
fd96eeef | 5033 | return fold (build2 (GT_EXPR, type, inner, comp_const)); |
155b05dc | 5034 | |
5035 | default: | |
5036 | return t; | |
5037 | } | |
5038 | } | |
5039 | \f | |
23ec2d5e | 5040 | /* T is an integer expression that is being multiplied, divided, or taken a |
5041 | modulus (CODE says which and what kind of divide or modulus) by a | |
5042 | constant C. See if we can eliminate that operation by folding it with | |
5043 | other operations already in T. WIDE_TYPE, if non-null, is a type that | |
5044 | should be used for the computation if wider than our type. | |
5045 | ||
b07ba9ff | 5046 | For example, if we are dividing (X * 8) + (Y * 16) by 4, we can return |
5047 | (X * 2) + (Y * 4). We must, however, be assured that either the original | |
2f5cf552 | 5048 | expression would not overflow or that overflow is undefined for the type |
5049 | in the language in question. | |
5050 | ||
5051 | We also canonicalize (X + 7) * 4 into X * 4 + 28 in the hope that either | |
5052 | the machine has a multiply-accumulate insn or that this is part of an | |
5053 | addressing calculation. | |
23ec2d5e | 5054 | |
5055 | If we return a non-null expression, it is an equivalent form of the | |
5056 | original computation, but need not be in the original type. */ | |
5057 | ||
5058 | static tree | |
de1b648b | 5059 | extract_muldiv (tree t, tree c, enum tree_code code, tree wide_type) |
009f6e1c | 5060 | { |
5061 | /* To avoid exponential search depth, refuse to allow recursion past | |
5062 | three levels. Beyond that (1) it's highly unlikely that we'll find | |
5063 | something interesting and (2) we've probably processed it before | |
5064 | when we built the inner expression. */ | |
5065 | ||
5066 | static int depth; | |
5067 | tree ret; | |
5068 | ||
5069 | if (depth > 3) | |
5070 | return NULL; | |
5071 | ||
5072 | depth++; | |
5073 | ret = extract_muldiv_1 (t, c, code, wide_type); | |
5074 | depth--; | |
5075 | ||
5076 | return ret; | |
5077 | } | |
5078 | ||
5079 | static tree | |
de1b648b | 5080 | extract_muldiv_1 (tree t, tree c, enum tree_code code, tree wide_type) |
23ec2d5e | 5081 | { |
5082 | tree type = TREE_TYPE (t); | |
5083 | enum tree_code tcode = TREE_CODE (t); | |
cc049fa3 | 5084 | tree ctype = (wide_type != 0 && (GET_MODE_SIZE (TYPE_MODE (wide_type)) |
23ec2d5e | 5085 | > GET_MODE_SIZE (TYPE_MODE (type))) |
5086 | ? wide_type : type); | |
5087 | tree t1, t2; | |
5088 | int same_p = tcode == code; | |
03435587 | 5089 | tree op0 = NULL_TREE, op1 = NULL_TREE; |
23ec2d5e | 5090 | |
5091 | /* Don't deal with constants of zero here; they confuse the code below. */ | |
5092 | if (integer_zerop (c)) | |
2f5cf552 | 5093 | return NULL_TREE; |
23ec2d5e | 5094 | |
ce45a448 | 5095 | if (TREE_CODE_CLASS (tcode) == tcc_unary) |
23ec2d5e | 5096 | op0 = TREE_OPERAND (t, 0); |
5097 | ||
ce45a448 | 5098 | if (TREE_CODE_CLASS (tcode) == tcc_binary) |
23ec2d5e | 5099 | op0 = TREE_OPERAND (t, 0), op1 = TREE_OPERAND (t, 1); |
5100 | ||
5101 | /* Note that we need not handle conditional operations here since fold | |
5102 | already handles those cases. So just do arithmetic here. */ | |
5103 | switch (tcode) | |
5104 | { | |
5105 | case INTEGER_CST: | |
5106 | /* For a constant, we can always simplify if we are a multiply | |
5107 | or (for divide and modulus) if it is a multiple of our constant. */ | |
5108 | if (code == MULT_EXPR | |
5109 | || integer_zerop (const_binop (TRUNC_MOD_EXPR, t, c, 0))) | |
b30e3dbc | 5110 | return const_binop (code, fold_convert (ctype, t), |
5111 | fold_convert (ctype, c), 0); | |
23ec2d5e | 5112 | break; |
5113 | ||
5114 | case CONVERT_EXPR: case NON_LVALUE_EXPR: case NOP_EXPR: | |
12480406 | 5115 | /* If op0 is an expression ... */ |
ce45a448 | 5116 | if ((COMPARISON_CLASS_P (op0) |
5117 | || UNARY_CLASS_P (op0) | |
5118 | || BINARY_CLASS_P (op0) | |
5119 | || EXPRESSION_CLASS_P (op0)) | |
12480406 | 5120 | /* ... and is unsigned, and its type is smaller than ctype, |
5121 | then we cannot pass through as widening. */ | |
78a8ed03 | 5122 | && ((TYPE_UNSIGNED (TREE_TYPE (op0)) |
12480406 | 5123 | && ! (TREE_CODE (TREE_TYPE (op0)) == INTEGER_TYPE |
5124 | && TYPE_IS_SIZETYPE (TREE_TYPE (op0))) | |
5125 | && (GET_MODE_SIZE (TYPE_MODE (ctype)) | |
5126 | > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0))))) | |
40309554 | 5127 | /* ... or this is a truncation (t is narrower than op0), |
5128 | then we cannot pass through this narrowing. */ | |
5129 | || (GET_MODE_SIZE (TYPE_MODE (type)) | |
cee280ef | 5130 | < GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))) |
5131 | /* ... or signedness changes for division or modulus, | |
5132 | then we cannot pass through this conversion. */ | |
5133 | || (code != MULT_EXPR | |
78a8ed03 | 5134 | && (TYPE_UNSIGNED (ctype) |
5135 | != TYPE_UNSIGNED (TREE_TYPE (op0)))))) | |
3cb1a3c6 | 5136 | break; |
5137 | ||
23ec2d5e | 5138 | /* Pass the constant down and see if we can make a simplification. If |
5f0002b0 | 5139 | we can, replace this expression with the inner simplification for |
5140 | possible later conversion to our or some other type. */ | |
b30e3dbc | 5141 | if ((t2 = fold_convert (TREE_TYPE (op0), c)) != 0 |
f2fa1510 | 5142 | && TREE_CODE (t2) == INTEGER_CST |
5143 | && ! TREE_CONSTANT_OVERFLOW (t2) | |
5144 | && (0 != (t1 = extract_muldiv (op0, t2, code, | |
5145 | code == MULT_EXPR | |
5146 | ? ctype : NULL_TREE)))) | |
23ec2d5e | 5147 | return t1; |
5148 | break; | |
5149 | ||
5150 | case NEGATE_EXPR: case ABS_EXPR: | |
5151 | if ((t1 = extract_muldiv (op0, c, code, wide_type)) != 0) | |
b30e3dbc | 5152 | return fold (build1 (tcode, ctype, fold_convert (ctype, t1))); |
23ec2d5e | 5153 | break; |
5154 | ||
5155 | case MIN_EXPR: case MAX_EXPR: | |
6269027b | 5156 | /* If widening the type changes the signedness, then we can't perform |
5157 | this optimization as that changes the result. */ | |
78a8ed03 | 5158 | if (TYPE_UNSIGNED (ctype) != TYPE_UNSIGNED (type)) |
6269027b | 5159 | break; |
5160 | ||
23ec2d5e | 5161 | /* MIN (a, b) / 5 -> MIN (a / 5, b / 5) */ |
5162 | if ((t1 = extract_muldiv (op0, c, code, wide_type)) != 0 | |
5163 | && (t2 = extract_muldiv (op1, c, code, wide_type)) != 0) | |
5f0002b0 | 5164 | { |
5165 | if (tree_int_cst_sgn (c) < 0) | |
5166 | tcode = (tcode == MIN_EXPR ? MAX_EXPR : MIN_EXPR); | |
5167 | ||
fd96eeef | 5168 | return fold (build2 (tcode, ctype, fold_convert (ctype, t1), |
5169 | fold_convert (ctype, t2))); | |
5f0002b0 | 5170 | } |
23ec2d5e | 5171 | break; |
5172 | ||
23ec2d5e | 5173 | case LSHIFT_EXPR: case RSHIFT_EXPR: |
5174 | /* If the second operand is constant, this is a multiplication | |
5175 | or floor division, by a power of two, so we can treat it that | |
dceee6fb | 5176 | way unless the multiplier or divisor overflows. Signed |
5177 | left-shift overflow is implementation-defined rather than | |
5178 | undefined in C90, so do not convert signed left shift into | |
5179 | multiplication. */ | |
23ec2d5e | 5180 | if (TREE_CODE (op1) == INTEGER_CST |
dceee6fb | 5181 | && (tcode == RSHIFT_EXPR || TYPE_UNSIGNED (TREE_TYPE (op0))) |
c011f821 | 5182 | /* const_binop may not detect overflow correctly, |
5183 | so check for it explicitly here. */ | |
5184 | && TYPE_PRECISION (TREE_TYPE (size_one_node)) > TREE_INT_CST_LOW (op1) | |
5185 | && TREE_INT_CST_HIGH (op1) == 0 | |
b30e3dbc | 5186 | && 0 != (t1 = fold_convert (ctype, |
5187 | const_binop (LSHIFT_EXPR, | |
5188 | size_one_node, | |
5189 | op1, 0))) | |
23ec2d5e | 5190 | && ! TREE_OVERFLOW (t1)) |
fd96eeef | 5191 | return extract_muldiv (build2 (tcode == LSHIFT_EXPR |
5192 | ? MULT_EXPR : FLOOR_DIV_EXPR, | |
5193 | ctype, fold_convert (ctype, op0), t1), | |
23ec2d5e | 5194 | c, code, wide_type); |
5195 | break; | |
5196 | ||
5197 | case PLUS_EXPR: case MINUS_EXPR: | |
5198 | /* See if we can eliminate the operation on both sides. If we can, we | |
5199 | can return a new PLUS or MINUS. If we can't, the only remaining | |
5200 | cases where we can do anything are if the second operand is a | |
5201 | constant. */ | |
5202 | t1 = extract_muldiv (op0, c, code, wide_type); | |
5203 | t2 = extract_muldiv (op1, c, code, wide_type); | |
17e3940f | 5204 | if (t1 != 0 && t2 != 0 |
5205 | && (code == MULT_EXPR | |
e5b30d78 | 5206 | /* If not multiplication, we can only do this if both operands |
5207 | are divisible by c. */ | |
5208 | || (multiple_of_p (ctype, op0, c) | |
5209 | && multiple_of_p (ctype, op1, c)))) | |
fd96eeef | 5210 | return fold (build2 (tcode, ctype, fold_convert (ctype, t1), |
5211 | fold_convert (ctype, t2))); | |
23ec2d5e | 5212 | |
5f0002b0 | 5213 | /* If this was a subtraction, negate OP1 and set it to be an addition. |
5214 | This simplifies the logic below. */ | |
5215 | if (tcode == MINUS_EXPR) | |
5216 | tcode = PLUS_EXPR, op1 = negate_expr (op1); | |
5217 | ||
ec4d93b0 | 5218 | if (TREE_CODE (op1) != INTEGER_CST) |
5219 | break; | |
5220 | ||
5f0002b0 | 5221 | /* If either OP1 or C are negative, this optimization is not safe for |
5222 | some of the division and remainder types while for others we need | |
5223 | to change the code. */ | |
5224 | if (tree_int_cst_sgn (op1) < 0 || tree_int_cst_sgn (c) < 0) | |
5225 | { | |
5226 | if (code == CEIL_DIV_EXPR) | |
5227 | code = FLOOR_DIV_EXPR; | |
5f0002b0 | 5228 | else if (code == FLOOR_DIV_EXPR) |
5229 | code = CEIL_DIV_EXPR; | |
b575bb01 | 5230 | else if (code != MULT_EXPR |
5231 | && code != CEIL_MOD_EXPR && code != FLOOR_MOD_EXPR) | |
5f0002b0 | 5232 | break; |
5233 | } | |
5234 | ||
98248b34 | 5235 | /* If it's a multiply or a division/modulus operation of a multiple |
5236 | of our constant, do the operation and verify it doesn't overflow. */ | |
5237 | if (code == MULT_EXPR | |
5238 | || integer_zerop (const_binop (TRUNC_MOD_EXPR, op1, c, 0))) | |
d3371fcd | 5239 | { |
b30e3dbc | 5240 | op1 = const_binop (code, fold_convert (ctype, op1), |
5241 | fold_convert (ctype, c), 0); | |
f5c47dd7 | 5242 | /* We allow the constant to overflow with wrapping semantics. */ |
5243 | if (op1 == 0 | |
5244 | || (TREE_OVERFLOW (op1) && ! flag_wrapv)) | |
d3371fcd | 5245 | break; |
5246 | } | |
98248b34 | 5247 | else |
d3371fcd | 5248 | break; |
5f0002b0 | 5249 | |
fc452262 | 5250 | /* If we have an unsigned type is not a sizetype, we cannot widen |
5251 | the operation since it will change the result if the original | |
5252 | computation overflowed. */ | |
78a8ed03 | 5253 | if (TYPE_UNSIGNED (ctype) |
d490e2f2 | 5254 | && ! (TREE_CODE (ctype) == INTEGER_TYPE && TYPE_IS_SIZETYPE (ctype)) |
fc452262 | 5255 | && ctype != type) |
5256 | break; | |
5257 | ||
23ec2d5e | 5258 | /* If we were able to eliminate our operation from the first side, |
5f0002b0 | 5259 | apply our operation to the second side and reform the PLUS. */ |
5260 | if (t1 != 0 && (TREE_CODE (t1) != code || code == MULT_EXPR)) | |
fd96eeef | 5261 | return fold (build2 (tcode, ctype, fold_convert (ctype, t1), op1)); |
23ec2d5e | 5262 | |
5263 | /* The last case is if we are a multiply. In that case, we can | |
5264 | apply the distributive law to commute the multiply and addition | |
6312a35e | 5265 | if the multiplication of the constants doesn't overflow. */ |
5f0002b0 | 5266 | if (code == MULT_EXPR) |
fd96eeef | 5267 | return fold (build2 (tcode, ctype, |
5268 | fold (build2 (code, ctype, | |
5269 | fold_convert (ctype, op0), | |
5270 | fold_convert (ctype, c))), | |
5271 | op1)); | |
23ec2d5e | 5272 | |
5273 | break; | |
5274 | ||
5275 | case MULT_EXPR: | |
5276 | /* We have a special case here if we are doing something like | |
5277 | (C * 8) % 4 since we know that's zero. */ | |
5278 | if ((code == TRUNC_MOD_EXPR || code == CEIL_MOD_EXPR | |
5279 | || code == FLOOR_MOD_EXPR || code == ROUND_MOD_EXPR) | |
5280 | && TREE_CODE (TREE_OPERAND (t, 1)) == INTEGER_CST | |
5281 | && integer_zerop (const_binop (TRUNC_MOD_EXPR, op1, c, 0))) | |
5282 | return omit_one_operand (type, integer_zero_node, op0); | |
5283 | ||
6312a35e | 5284 | /* ... fall through ... */ |
23ec2d5e | 5285 | |
5286 | case TRUNC_DIV_EXPR: case CEIL_DIV_EXPR: case FLOOR_DIV_EXPR: | |
5287 | case ROUND_DIV_EXPR: case EXACT_DIV_EXPR: | |
5288 | /* If we can extract our operation from the LHS, do so and return a | |
5289 | new operation. Likewise for the RHS from a MULT_EXPR. Otherwise, | |
5290 | do something only if the second operand is a constant. */ | |
5291 | if (same_p | |
5292 | && (t1 = extract_muldiv (op0, c, code, wide_type)) != 0) | |
fd96eeef | 5293 | return fold (build2 (tcode, ctype, fold_convert (ctype, t1), |
5294 | fold_convert (ctype, op1))); | |
23ec2d5e | 5295 | else if (tcode == MULT_EXPR && code == MULT_EXPR |
5296 | && (t1 = extract_muldiv (op1, c, code, wide_type)) != 0) | |
fd96eeef | 5297 | return fold (build2 (tcode, ctype, fold_convert (ctype, op0), |
5298 | fold_convert (ctype, t1))); | |
23ec2d5e | 5299 | else if (TREE_CODE (op1) != INTEGER_CST) |
5300 | return 0; | |
5301 | ||
5302 | /* If these are the same operation types, we can associate them | |
5303 | assuming no overflow. */ | |
5304 | if (tcode == code | |
b30e3dbc | 5305 | && 0 != (t1 = const_binop (MULT_EXPR, fold_convert (ctype, op1), |
5306 | fold_convert (ctype, c), 0)) | |
23ec2d5e | 5307 | && ! TREE_OVERFLOW (t1)) |
fd96eeef | 5308 | return fold (build2 (tcode, ctype, fold_convert (ctype, op0), t1)); |
23ec2d5e | 5309 | |
5310 | /* If these operations "cancel" each other, we have the main | |
5311 | optimizations of this pass, which occur when either constant is a | |
5312 | multiple of the other, in which case we replace this with either an | |
cc049fa3 | 5313 | operation or CODE or TCODE. |
2f5cf552 | 5314 | |
35a3065a | 5315 | If we have an unsigned type that is not a sizetype, we cannot do |
2f5cf552 | 5316 | this since it will change the result if the original computation |
5317 | overflowed. */ | |
78a8ed03 | 5318 | if ((! TYPE_UNSIGNED (ctype) |
d490e2f2 | 5319 | || (TREE_CODE (ctype) == INTEGER_TYPE && TYPE_IS_SIZETYPE (ctype))) |
b24bee03 | 5320 | && ! flag_wrapv |
2f5cf552 | 5321 | && ((code == MULT_EXPR && tcode == EXACT_DIV_EXPR) |
5322 | || (tcode == MULT_EXPR | |
5323 | && code != TRUNC_MOD_EXPR && code != CEIL_MOD_EXPR | |
5324 | && code != FLOOR_MOD_EXPR && code != ROUND_MOD_EXPR))) | |
23ec2d5e | 5325 | { |
5326 | if (integer_zerop (const_binop (TRUNC_MOD_EXPR, op1, c, 0))) | |
fd96eeef | 5327 | return fold (build2 (tcode, ctype, fold_convert (ctype, op0), |
5328 | fold_convert (ctype, | |
5329 | const_binop (TRUNC_DIV_EXPR, | |
5330 | op1, c, 0)))); | |
23ec2d5e | 5331 | else if (integer_zerop (const_binop (TRUNC_MOD_EXPR, c, op1, 0))) |
fd96eeef | 5332 | return fold (build2 (code, ctype, fold_convert (ctype, op0), |
5333 | fold_convert (ctype, | |
5334 | const_binop (TRUNC_DIV_EXPR, | |
5335 | c, op1, 0)))); | |
23ec2d5e | 5336 | } |
5337 | break; | |
5338 | ||
5339 | default: | |
5340 | break; | |
5341 | } | |
5342 | ||
5343 | return 0; | |
5344 | } | |
5345 | \f | |
b4af30fd | 5346 | /* Return a node which has the indicated constant VALUE (either 0 or |
5347 | 1), and is of the indicated TYPE. */ | |
5348 | ||
5c9198bd | 5349 | tree |
de1b648b | 5350 | constant_boolean_node (int value, tree type) |
b4af30fd | 5351 | { |
5352 | if (type == integer_type_node) | |
5353 | return value ? integer_one_node : integer_zero_node; | |
c4e122e7 | 5354 | else if (type == boolean_type_node) |
5355 | return value ? boolean_true_node : boolean_false_node; | |
b4af30fd | 5356 | else if (TREE_CODE (type) == BOOLEAN_TYPE) |
fa8b888f | 5357 | return lang_hooks.truthvalue_conversion (value ? integer_one_node |
5358 | : integer_zero_node); | |
cc049fa3 | 5359 | else |
7016c612 | 5360 | return build_int_cst (type, value); |
b4af30fd | 5361 | } |
5362 | ||
203a24c4 | 5363 | /* Transform `a + (b ? x : y)' into `b ? (a + x) : (a + y)'. |
47cbd05d | 5364 | Transform, `a + (x < y)' into `(x < y) ? (a + 1) : (a + 0)'. Here |
5365 | CODE corresponds to the `+', COND to the `(b ? x : y)' or `(x < y)' | |
6ef828f9 | 5366 | expression, and ARG to `a'. If COND_FIRST_P is nonzero, then the |
47cbd05d | 5367 | COND is the first argument to CODE; otherwise (as in the example |
5368 | given here), it is the second argument. TYPE is the type of the | |
9c9bad97 | 5369 | original expression. Return NULL_TREE if no simplification is |
a6661800 | 5370 | possible. */ |
47cbd05d | 5371 | |
5372 | static tree | |
dc81944a | 5373 | fold_binary_op_with_conditional_arg (enum tree_code code, tree type, |
5374 | tree cond, tree arg, int cond_first_p) | |
47cbd05d | 5375 | { |
5376 | tree test, true_value, false_value; | |
5377 | tree lhs = NULL_TREE; | |
5378 | tree rhs = NULL_TREE; | |
a6661800 | 5379 | |
f2b83d13 | 5380 | /* This transformation is only worthwhile if we don't have to wrap |
5381 | arg in a SAVE_EXPR, and the operation can be simplified on atleast | |
5382 | one of the branches once its pushed inside the COND_EXPR. */ | |
5383 | if (!TREE_CONSTANT (arg)) | |
a6661800 | 5384 | return NULL_TREE; |
5385 | ||
47cbd05d | 5386 | if (TREE_CODE (cond) == COND_EXPR) |
5387 | { | |
5388 | test = TREE_OPERAND (cond, 0); | |
5389 | true_value = TREE_OPERAND (cond, 1); | |
5390 | false_value = TREE_OPERAND (cond, 2); | |
5391 | /* If this operand throws an expression, then it does not make | |
5392 | sense to try to perform a logical or arithmetic operation | |
f2b83d13 | 5393 | involving it. */ |
47cbd05d | 5394 | if (VOID_TYPE_P (TREE_TYPE (true_value))) |
f2b83d13 | 5395 | lhs = true_value; |
47cbd05d | 5396 | if (VOID_TYPE_P (TREE_TYPE (false_value))) |
f2b83d13 | 5397 | rhs = false_value; |
47cbd05d | 5398 | } |
5399 | else | |
5400 | { | |
5401 | tree testtype = TREE_TYPE (cond); | |
5402 | test = cond; | |
20783f07 | 5403 | true_value = constant_boolean_node (true, testtype); |
5404 | false_value = constant_boolean_node (false, testtype); | |
47cbd05d | 5405 | } |
d3371fcd | 5406 | |
47cbd05d | 5407 | if (lhs == 0) |
f2b83d13 | 5408 | lhs = fold (cond_first_p ? build2 (code, type, true_value, arg) |
5409 | : build2 (code, type, arg, true_value)); | |
47cbd05d | 5410 | if (rhs == 0) |
f2b83d13 | 5411 | rhs = fold (cond_first_p ? build2 (code, type, false_value, arg) |
5412 | : build2 (code, type, arg, false_value)); | |
5413 | ||
5414 | test = fold (build3 (COND_EXPR, type, test, lhs, rhs)); | |
5415 | return fold_convert (type, test); | |
47cbd05d | 5416 | } |
5417 | ||
be2828ce | 5418 | \f |
920d0fb5 | 5419 | /* Subroutine of fold() that checks for the addition of +/- 0.0. |
5420 | ||
5421 | If !NEGATE, return true if ADDEND is +/-0.0 and, for all X of type | |
5422 | TYPE, X + ADDEND is the same as X. If NEGATE, return true if X - | |
5423 | ADDEND is the same as X. | |
5424 | ||
6ef828f9 | 5425 | X + 0 and X - 0 both give X when X is NaN, infinite, or nonzero |
920d0fb5 | 5426 | and finite. The problematic cases are when X is zero, and its mode |
5427 | has signed zeros. In the case of rounding towards -infinity, | |
5428 | X - 0 is not the same as X because 0 - 0 is -0. In other rounding | |
5429 | modes, X + 0 is not the same as X because -0 + 0 is 0. */ | |
5430 | ||
5431 | static bool | |
de1b648b | 5432 | fold_real_zero_addition_p (tree type, tree addend, int negate) |
920d0fb5 | 5433 | { |
5434 | if (!real_zerop (addend)) | |
5435 | return false; | |
5436 | ||
c7590f7e | 5437 | /* Don't allow the fold with -fsignaling-nans. */ |
5438 | if (HONOR_SNANS (TYPE_MODE (type))) | |
5439 | return false; | |
5440 | ||
920d0fb5 | 5441 | /* Allow the fold if zeros aren't signed, or their sign isn't important. */ |
5442 | if (!HONOR_SIGNED_ZEROS (TYPE_MODE (type))) | |
5443 | return true; | |
5444 | ||
5445 | /* Treat x + -0 as x - 0 and x - -0 as x + 0. */ | |
5446 | if (TREE_CODE (addend) == REAL_CST | |
5447 | && REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (addend))) | |
5448 | negate = !negate; | |
5449 | ||
5450 | /* The mode has signed zeros, and we have to honor their sign. | |
5451 | In this situation, there is only one case we can return true for. | |
5452 | X - 0 is the same as X unless rounding towards -infinity is | |
5453 | supported. */ | |
5454 | return negate && !HONOR_SIGN_DEPENDENT_ROUNDING (TYPE_MODE (type)); | |
5455 | } | |
5456 | ||
4b0b9adb | 5457 | /* Subroutine of fold() that checks comparisons of built-in math |
5458 | functions against real constants. | |
5459 | ||
5460 | FCODE is the DECL_FUNCTION_CODE of the built-in, CODE is the comparison | |
5461 | operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR, GE_EXPR or LE_EXPR. TYPE | |
5462 | is the type of the result and ARG0 and ARG1 are the operands of the | |
5463 | comparison. ARG1 must be a TREE_REAL_CST. | |
5464 | ||
5465 | The function returns the constant folded tree if a simplification | |
5466 | can be made, and NULL_TREE otherwise. */ | |
5467 | ||
5468 | static tree | |
dc81944a | 5469 | fold_mathfn_compare (enum built_in_function fcode, enum tree_code code, |
5470 | tree type, tree arg0, tree arg1) | |
4b0b9adb | 5471 | { |
5472 | REAL_VALUE_TYPE c; | |
5473 | ||
852da3c3 | 5474 | if (BUILTIN_SQRT_P (fcode)) |
4b0b9adb | 5475 | { |
5476 | tree arg = TREE_VALUE (TREE_OPERAND (arg0, 1)); | |
5477 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (arg0)); | |
5478 | ||
5479 | c = TREE_REAL_CST (arg1); | |
5480 | if (REAL_VALUE_NEGATIVE (c)) | |
5481 | { | |
5482 | /* sqrt(x) < y is always false, if y is negative. */ | |
5483 | if (code == EQ_EXPR || code == LT_EXPR || code == LE_EXPR) | |
20783f07 | 5484 | return omit_one_operand (type, integer_zero_node, arg); |
4b0b9adb | 5485 | |
5486 | /* sqrt(x) > y is always true, if y is negative and we | |
5487 | don't care about NaNs, i.e. negative values of x. */ | |
5488 | if (code == NE_EXPR || !HONOR_NANS (mode)) | |
20783f07 | 5489 | return omit_one_operand (type, integer_one_node, arg); |
4b0b9adb | 5490 | |
5491 | /* sqrt(x) > y is the same as x >= 0, if y is negative. */ | |
fd96eeef | 5492 | return fold (build2 (GE_EXPR, type, arg, |
5493 | build_real (TREE_TYPE (arg), dconst0))); | |
4b0b9adb | 5494 | } |
5495 | else if (code == GT_EXPR || code == GE_EXPR) | |
5496 | { | |
5497 | REAL_VALUE_TYPE c2; | |
5498 | ||
5499 | REAL_ARITHMETIC (c2, MULT_EXPR, c, c); | |
5500 | real_convert (&c2, mode, &c2); | |
5501 | ||
5502 | if (REAL_VALUE_ISINF (c2)) | |
5503 | { | |
5504 | /* sqrt(x) > y is x == +Inf, when y is very large. */ | |
5505 | if (HONOR_INFINITIES (mode)) | |
fd96eeef | 5506 | return fold (build2 (EQ_EXPR, type, arg, |
5507 | build_real (TREE_TYPE (arg), c2))); | |
4b0b9adb | 5508 | |
5509 | /* sqrt(x) > y is always false, when y is very large | |
5510 | and we don't care about infinities. */ | |
20783f07 | 5511 | return omit_one_operand (type, integer_zero_node, arg); |
4b0b9adb | 5512 | } |
5513 | ||
5514 | /* sqrt(x) > c is the same as x > c*c. */ | |
fd96eeef | 5515 | return fold (build2 (code, type, arg, |
5516 | build_real (TREE_TYPE (arg), c2))); | |
4b0b9adb | 5517 | } |
5518 | else if (code == LT_EXPR || code == LE_EXPR) | |
5519 | { | |
5520 | REAL_VALUE_TYPE c2; | |
5521 | ||
5522 | REAL_ARITHMETIC (c2, MULT_EXPR, c, c); | |
5523 | real_convert (&c2, mode, &c2); | |
5524 | ||
5525 | if (REAL_VALUE_ISINF (c2)) | |
5526 | { | |
5527 | /* sqrt(x) < y is always true, when y is a very large | |
5528 | value and we don't care about NaNs or Infinities. */ | |
5529 | if (! HONOR_NANS (mode) && ! HONOR_INFINITIES (mode)) | |
20783f07 | 5530 | return omit_one_operand (type, integer_one_node, arg); |
4b0b9adb | 5531 | |
5532 | /* sqrt(x) < y is x != +Inf when y is very large and we | |
5533 | don't care about NaNs. */ | |
5534 | if (! HONOR_NANS (mode)) | |
fd96eeef | 5535 | return fold (build2 (NE_EXPR, type, arg, |
5536 | build_real (TREE_TYPE (arg), c2))); | |
4b0b9adb | 5537 | |
5538 | /* sqrt(x) < y is x >= 0 when y is very large and we | |
5539 | don't care about Infinities. */ | |
5540 | if (! HONOR_INFINITIES (mode)) | |
fd96eeef | 5541 | return fold (build2 (GE_EXPR, type, arg, |
5542 | build_real (TREE_TYPE (arg), dconst0))); | |
4b0b9adb | 5543 | |
5544 | /* sqrt(x) < y is x >= 0 && x != +Inf, when y is large. */ | |
fa8b888f | 5545 | if (lang_hooks.decls.global_bindings_p () != 0 |
ce3fb06e | 5546 | || CONTAINS_PLACEHOLDER_P (arg)) |
4b0b9adb | 5547 | return NULL_TREE; |
5548 | ||
5549 | arg = save_expr (arg); | |
fd96eeef | 5550 | return fold (build2 (TRUTH_ANDIF_EXPR, type, |
5551 | fold (build2 (GE_EXPR, type, arg, | |
5552 | build_real (TREE_TYPE (arg), | |
5553 | dconst0))), | |
5554 | fold (build2 (NE_EXPR, type, arg, | |
5555 | build_real (TREE_TYPE (arg), | |
5556 | c2))))); | |
4b0b9adb | 5557 | } |
5558 | ||
5559 | /* sqrt(x) < c is the same as x < c*c, if we ignore NaNs. */ | |
5560 | if (! HONOR_NANS (mode)) | |
fd96eeef | 5561 | return fold (build2 (code, type, arg, |
5562 | build_real (TREE_TYPE (arg), c2))); | |
4b0b9adb | 5563 | |
5564 | /* sqrt(x) < c is the same as x >= 0 && x < c*c. */ | |
fa8b888f | 5565 | if (lang_hooks.decls.global_bindings_p () == 0 |
ce3fb06e | 5566 | && ! CONTAINS_PLACEHOLDER_P (arg)) |
4b0b9adb | 5567 | { |
5568 | arg = save_expr (arg); | |
fd96eeef | 5569 | return fold (build2 (TRUTH_ANDIF_EXPR, type, |
5570 | fold (build2 (GE_EXPR, type, arg, | |
5571 | build_real (TREE_TYPE (arg), | |
5572 | dconst0))), | |
5573 | fold (build2 (code, type, arg, | |
5574 | build_real (TREE_TYPE (arg), | |
5575 | c2))))); | |
4b0b9adb | 5576 | } |
5577 | } | |
5578 | } | |
5579 | ||
5580 | return NULL_TREE; | |
5581 | } | |
5582 | ||
6d2e901f | 5583 | /* Subroutine of fold() that optimizes comparisons against Infinities, |
5584 | either +Inf or -Inf. | |
5585 | ||
5586 | CODE is the comparison operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR, | |
5587 | GE_EXPR or LE_EXPR. TYPE is the type of the result and ARG0 and ARG1 | |
5588 | are the operands of the comparison. ARG1 must be a TREE_REAL_CST. | |
5589 | ||
5590 | The function returns the constant folded tree if a simplification | |
5591 | can be made, and NULL_TREE otherwise. */ | |
5592 | ||
5593 | static tree | |
de1b648b | 5594 | fold_inf_compare (enum tree_code code, tree type, tree arg0, tree arg1) |
6d2e901f | 5595 | { |
ac4bd9a0 | 5596 | enum machine_mode mode; |
5597 | REAL_VALUE_TYPE max; | |
5598 | tree temp; | |
5599 | bool neg; | |
5600 | ||
5601 | mode = TYPE_MODE (TREE_TYPE (arg0)); | |
5602 | ||
6d2e901f | 5603 | /* For negative infinity swap the sense of the comparison. */ |
ac4bd9a0 | 5604 | neg = REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg1)); |
5605 | if (neg) | |
6d2e901f | 5606 | code = swap_tree_comparison (code); |
5607 | ||
5608 | switch (code) | |
5609 | { | |
5610 | case GT_EXPR: | |
5611 | /* x > +Inf is always false, if with ignore sNANs. */ | |
ac4bd9a0 | 5612 | if (HONOR_SNANS (mode)) |
6d2e901f | 5613 | return NULL_TREE; |
20783f07 | 5614 | return omit_one_operand (type, integer_zero_node, arg0); |
6d2e901f | 5615 | |
5616 | case LE_EXPR: | |
5617 | /* x <= +Inf is always true, if we don't case about NaNs. */ | |
ac4bd9a0 | 5618 | if (! HONOR_NANS (mode)) |
20783f07 | 5619 | return omit_one_operand (type, integer_one_node, arg0); |
6d2e901f | 5620 | |
5621 | /* x <= +Inf is the same as x == x, i.e. isfinite(x). */ | |
fa8b888f | 5622 | if (lang_hooks.decls.global_bindings_p () == 0 |
ce3fb06e | 5623 | && ! CONTAINS_PLACEHOLDER_P (arg0)) |
6d2e901f | 5624 | { |
5625 | arg0 = save_expr (arg0); | |
fd96eeef | 5626 | return fold (build2 (EQ_EXPR, type, arg0, arg0)); |
6d2e901f | 5627 | } |
5628 | break; | |
5629 | ||
ac4bd9a0 | 5630 | case EQ_EXPR: |
5631 | case GE_EXPR: | |
5632 | /* x == +Inf and x >= +Inf are always equal to x > DBL_MAX. */ | |
5633 | real_maxval (&max, neg, mode); | |
fd96eeef | 5634 | return fold (build2 (neg ? LT_EXPR : GT_EXPR, type, |
5635 | arg0, build_real (TREE_TYPE (arg0), max))); | |
ac4bd9a0 | 5636 | |
5637 | case LT_EXPR: | |
5638 | /* x < +Inf is always equal to x <= DBL_MAX. */ | |
5639 | real_maxval (&max, neg, mode); | |
fd96eeef | 5640 | return fold (build2 (neg ? GE_EXPR : LE_EXPR, type, |
5641 | arg0, build_real (TREE_TYPE (arg0), max))); | |
ac4bd9a0 | 5642 | |
5643 | case NE_EXPR: | |
5644 | /* x != +Inf is always equal to !(x > DBL_MAX). */ | |
5645 | real_maxval (&max, neg, mode); | |
5646 | if (! HONOR_NANS (mode)) | |
fd96eeef | 5647 | return fold (build2 (neg ? GE_EXPR : LE_EXPR, type, |
5648 | arg0, build_real (TREE_TYPE (arg0), max))); | |
bd1ec513 | 5649 | |
5650 | /* The transformation below creates non-gimple code and thus is | |
5651 | not appropriate if we are in gimple form. */ | |
5652 | if (in_gimple_form) | |
5653 | return NULL_TREE; | |
7206da1b | 5654 | |
fd96eeef | 5655 | temp = fold (build2 (neg ? LT_EXPR : GT_EXPR, type, |
5656 | arg0, build_real (TREE_TYPE (arg0), max))); | |
ac4bd9a0 | 5657 | return fold (build1 (TRUTH_NOT_EXPR, type, temp)); |
6d2e901f | 5658 | |
5659 | default: | |
5660 | break; | |
5661 | } | |
5662 | ||
5663 | return NULL_TREE; | |
5664 | } | |
920d0fb5 | 5665 | |
270029e0 | 5666 | /* Subroutine of fold() that optimizes comparisons of a division by |
365db11e | 5667 | a nonzero integer constant against an integer constant, i.e. |
270029e0 | 5668 | X/C1 op C2. |
5669 | ||
5670 | CODE is the comparison operator: EQ_EXPR, NE_EXPR, GT_EXPR, LT_EXPR, | |
5671 | GE_EXPR or LE_EXPR. TYPE is the type of the result and ARG0 and ARG1 | |
5672 | are the operands of the comparison. ARG1 must be a TREE_REAL_CST. | |
5673 | ||
5674 | The function returns the constant folded tree if a simplification | |
5675 | can be made, and NULL_TREE otherwise. */ | |
5676 | ||
5677 | static tree | |
5678 | fold_div_compare (enum tree_code code, tree type, tree arg0, tree arg1) | |
5679 | { | |
5680 | tree prod, tmp, hi, lo; | |
5681 | tree arg00 = TREE_OPERAND (arg0, 0); | |
5682 | tree arg01 = TREE_OPERAND (arg0, 1); | |
5683 | unsigned HOST_WIDE_INT lpart; | |
5684 | HOST_WIDE_INT hpart; | |
5685 | int overflow; | |
5686 | ||
5687 | /* We have to do this the hard way to detect unsigned overflow. | |
5688 | prod = int_const_binop (MULT_EXPR, arg01, arg1, 0); */ | |
5689 | overflow = mul_double (TREE_INT_CST_LOW (arg01), | |
5690 | TREE_INT_CST_HIGH (arg01), | |
5691 | TREE_INT_CST_LOW (arg1), | |
5692 | TREE_INT_CST_HIGH (arg1), &lpart, &hpart); | |
7016c612 | 5693 | prod = build_int_cst_wide (TREE_TYPE (arg00), lpart, hpart); |
4d28c5d1 | 5694 | prod = force_fit_type (prod, -1, overflow, false); |
270029e0 | 5695 | |
5696 | if (TYPE_UNSIGNED (TREE_TYPE (arg0))) | |
5697 | { | |
5698 | tmp = int_const_binop (MINUS_EXPR, arg01, integer_one_node, 0); | |
5699 | lo = prod; | |
5700 | ||
5701 | /* Likewise hi = int_const_binop (PLUS_EXPR, prod, tmp, 0). */ | |
5702 | overflow = add_double (TREE_INT_CST_LOW (prod), | |
5703 | TREE_INT_CST_HIGH (prod), | |
5704 | TREE_INT_CST_LOW (tmp), | |
5705 | TREE_INT_CST_HIGH (tmp), | |
5706 | &lpart, &hpart); | |
7016c612 | 5707 | hi = build_int_cst_wide (TREE_TYPE (arg00), lpart, hpart); |
4d28c5d1 | 5708 | hi = force_fit_type (hi, -1, overflow | TREE_OVERFLOW (prod), |
5709 | TREE_CONSTANT_OVERFLOW (prod)); | |
270029e0 | 5710 | } |
5711 | else if (tree_int_cst_sgn (arg01) >= 0) | |
5712 | { | |
5713 | tmp = int_const_binop (MINUS_EXPR, arg01, integer_one_node, 0); | |
5714 | switch (tree_int_cst_sgn (arg1)) | |
5715 | { | |
5716 | case -1: | |
5717 | lo = int_const_binop (MINUS_EXPR, prod, tmp, 0); | |
5718 | hi = prod; | |
5719 | break; | |
5720 | ||
5721 | case 0: | |
5722 | lo = fold_negate_const (tmp, TREE_TYPE (arg0)); | |
5723 | hi = tmp; | |
5724 | break; | |
5725 | ||
5726 | case 1: | |
5727 | hi = int_const_binop (PLUS_EXPR, prod, tmp, 0); | |
5728 | lo = prod; | |
5729 | break; | |
5730 | ||
5731 | default: | |
fdada98f | 5732 | gcc_unreachable (); |
270029e0 | 5733 | } |
5734 | } | |
5735 | else | |
5736 | { | |
460c8e36 | 5737 | /* A negative divisor reverses the relational operators. */ |
5738 | code = swap_tree_comparison (code); | |
5739 | ||
270029e0 | 5740 | tmp = int_const_binop (PLUS_EXPR, arg01, integer_one_node, 0); |
5741 | switch (tree_int_cst_sgn (arg1)) | |
5742 | { | |
5743 | case -1: | |
5744 | hi = int_const_binop (MINUS_EXPR, prod, tmp, 0); | |
5745 | lo = prod; | |
5746 | break; | |
5747 | ||
5748 | case 0: | |
5749 | hi = fold_negate_const (tmp, TREE_TYPE (arg0)); | |
5750 | lo = tmp; | |
5751 | break; | |
5752 | ||
5753 | case 1: | |
5754 | lo = int_const_binop (PLUS_EXPR, prod, tmp, 0); | |
5755 | hi = prod; | |
5756 | break; | |
5757 | ||
5758 | default: | |
fdada98f | 5759 | gcc_unreachable (); |
270029e0 | 5760 | } |
5761 | } | |
5762 | ||
5763 | switch (code) | |
5764 | { | |
5765 | case EQ_EXPR: | |
5766 | if (TREE_OVERFLOW (lo) && TREE_OVERFLOW (hi)) | |
5767 | return omit_one_operand (type, integer_zero_node, arg00); | |
5768 | if (TREE_OVERFLOW (hi)) | |
5769 | return fold (build2 (GE_EXPR, type, arg00, lo)); | |
5770 | if (TREE_OVERFLOW (lo)) | |
5771 | return fold (build2 (LE_EXPR, type, arg00, hi)); | |
5772 | return build_range_check (type, arg00, 1, lo, hi); | |
5773 | ||
5774 | case NE_EXPR: | |
5775 | if (TREE_OVERFLOW (lo) && TREE_OVERFLOW (hi)) | |
5776 | return omit_one_operand (type, integer_one_node, arg00); | |
5777 | if (TREE_OVERFLOW (hi)) | |
5778 | return fold (build2 (LT_EXPR, type, arg00, lo)); | |
5779 | if (TREE_OVERFLOW (lo)) | |
5780 | return fold (build2 (GT_EXPR, type, arg00, hi)); | |
5781 | return build_range_check (type, arg00, 0, lo, hi); | |
5782 | ||
5783 | case LT_EXPR: | |
5784 | if (TREE_OVERFLOW (lo)) | |
5785 | return omit_one_operand (type, integer_zero_node, arg00); | |
5786 | return fold (build2 (LT_EXPR, type, arg00, lo)); | |
5787 | ||
5788 | case LE_EXPR: | |
5789 | if (TREE_OVERFLOW (hi)) | |
5790 | return omit_one_operand (type, integer_one_node, arg00); | |
5791 | return fold (build2 (LE_EXPR, type, arg00, hi)); | |
5792 | ||
5793 | case GT_EXPR: | |
5794 | if (TREE_OVERFLOW (hi)) | |
5795 | return omit_one_operand (type, integer_zero_node, arg00); | |
5796 | return fold (build2 (GT_EXPR, type, arg00, hi)); | |
5797 | ||
5798 | case GE_EXPR: | |
5799 | if (TREE_OVERFLOW (lo)) | |
5800 | return omit_one_operand (type, integer_one_node, arg00); | |
5801 | return fold (build2 (GE_EXPR, type, arg00, lo)); | |
5802 | ||
5803 | default: | |
5804 | break; | |
5805 | } | |
5806 | ||
5807 | return NULL_TREE; | |
5808 | } | |
5809 | ||
5810 | ||
6881f973 | 5811 | /* If CODE with arguments ARG0 and ARG1 represents a single bit |
5812 | equality/inequality test, then return a simplified form of | |
5813 | the test using shifts and logical operations. Otherwise return | |
5814 | NULL. TYPE is the desired result type. */ | |
7206da1b | 5815 | |
6881f973 | 5816 | tree |
f82b06e0 | 5817 | fold_single_bit_test (enum tree_code code, tree arg0, tree arg1, |
5818 | tree result_type) | |
6881f973 | 5819 | { |
5820 | /* If this is a TRUTH_NOT_EXPR, it may have a single bit test inside | |
5821 | operand 0. */ | |
5822 | if (code == TRUTH_NOT_EXPR) | |
5823 | { | |
5824 | code = TREE_CODE (arg0); | |
5825 | if (code != NE_EXPR && code != EQ_EXPR) | |
5826 | return NULL_TREE; | |
5827 | ||
5828 | /* Extract the arguments of the EQ/NE. */ | |
5829 | arg1 = TREE_OPERAND (arg0, 1); | |
5830 | arg0 = TREE_OPERAND (arg0, 0); | |
5831 | ||
7206da1b | 5832 | /* This requires us to invert the code. */ |
6881f973 | 5833 | code = (code == EQ_EXPR ? NE_EXPR : EQ_EXPR); |
5834 | } | |
5835 | ||
5836 | /* If this is testing a single bit, we can optimize the test. */ | |
5837 | if ((code == NE_EXPR || code == EQ_EXPR) | |
5838 | && TREE_CODE (arg0) == BIT_AND_EXPR && integer_zerop (arg1) | |
5839 | && integer_pow2p (TREE_OPERAND (arg0, 1))) | |
5840 | { | |
5841 | tree inner = TREE_OPERAND (arg0, 0); | |
5842 | tree type = TREE_TYPE (arg0); | |
5843 | int bitnum = tree_log2 (TREE_OPERAND (arg0, 1)); | |
5844 | enum machine_mode operand_mode = TYPE_MODE (type); | |
5845 | int ops_unsigned; | |
654d0fed | 5846 | tree signed_type, unsigned_type, intermediate_type; |
6881f973 | 5847 | tree arg00; |
7206da1b | 5848 | |
6881f973 | 5849 | /* If we have (A & C) != 0 where C is the sign bit of A, convert |
5850 | this into A < 0. Similarly for (A & C) == 0 into A >= 0. */ | |
5851 | arg00 = sign_bit_p (TREE_OPERAND (arg0, 0), TREE_OPERAND (arg0, 1)); | |
7cc00cbd | 5852 | if (arg00 != NULL_TREE |
5853 | /* This is only a win if casting to a signed type is cheap, | |
5854 | i.e. when arg00's type is not a partial mode. */ | |
5855 | && TYPE_PRECISION (TREE_TYPE (arg00)) | |
5856 | == GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (arg00)))) | |
6881f973 | 5857 | { |
fa8b888f | 5858 | tree stype = lang_hooks.types.signed_type (TREE_TYPE (arg00)); |
fd96eeef | 5859 | return fold (build2 (code == EQ_EXPR ? GE_EXPR : LT_EXPR, |
5860 | result_type, fold_convert (stype, arg00), | |
5861 | fold_convert (stype, integer_zero_node))); | |
6881f973 | 5862 | } |
a4de5624 | 5863 | |
7206da1b | 5864 | /* Otherwise we have (A & C) != 0 where C is a single bit, |
6881f973 | 5865 | convert that into ((A >> C2) & 1). Where C2 = log2(C). |
5866 | Similarly for (A & C) == 0. */ | |
5867 | ||
5868 | /* If INNER is a right shift of a constant and it plus BITNUM does | |
5869 | not overflow, adjust BITNUM and INNER. */ | |
5870 | if (TREE_CODE (inner) == RSHIFT_EXPR | |
5871 | && TREE_CODE (TREE_OPERAND (inner, 1)) == INTEGER_CST | |
5872 | && TREE_INT_CST_HIGH (TREE_OPERAND (inner, 1)) == 0 | |
5873 | && bitnum < TYPE_PRECISION (type) | |
5874 | && 0 > compare_tree_int (TREE_OPERAND (inner, 1), | |
5875 | bitnum - TYPE_PRECISION (type))) | |
5876 | { | |
5877 | bitnum += TREE_INT_CST_LOW (TREE_OPERAND (inner, 1)); | |
5878 | inner = TREE_OPERAND (inner, 0); | |
5879 | } | |
5880 | ||
5881 | /* If we are going to be able to omit the AND below, we must do our | |
5882 | operations as unsigned. If we must use the AND, we have a choice. | |
5883 | Normally unsigned is faster, but for some machines signed is. */ | |
6881f973 | 5884 | #ifdef LOAD_EXTEND_OP |
a4de5624 | 5885 | ops_unsigned = (LOAD_EXTEND_OP (operand_mode) == SIGN_EXTEND ? 0 : 1); |
6881f973 | 5886 | #else |
a4de5624 | 5887 | ops_unsigned = 1; |
6881f973 | 5888 | #endif |
6881f973 | 5889 | |
fa8b888f | 5890 | signed_type = lang_hooks.types.type_for_mode (operand_mode, 0); |
5891 | unsigned_type = lang_hooks.types.type_for_mode (operand_mode, 1); | |
654d0fed | 5892 | intermediate_type = ops_unsigned ? unsigned_type : signed_type; |
b30e3dbc | 5893 | inner = fold_convert (intermediate_type, inner); |
6881f973 | 5894 | |
5895 | if (bitnum != 0) | |
fd96eeef | 5896 | inner = build2 (RSHIFT_EXPR, intermediate_type, |
5897 | inner, size_int (bitnum)); | |
6881f973 | 5898 | |
5899 | if (code == EQ_EXPR) | |
abfce8ed | 5900 | inner = fold (build2 (BIT_XOR_EXPR, intermediate_type, |
5901 | inner, integer_one_node)); | |
6881f973 | 5902 | |
5903 | /* Put the AND last so it can combine with more things. */ | |
fd96eeef | 5904 | inner = build2 (BIT_AND_EXPR, intermediate_type, |
5905 | inner, integer_one_node); | |
6881f973 | 5906 | |
5907 | /* Make sure to return the proper type. */ | |
b30e3dbc | 5908 | inner = fold_convert (result_type, inner); |
6881f973 | 5909 | |
5910 | return inner; | |
5911 | } | |
5912 | return NULL_TREE; | |
5913 | } | |
fc3df357 | 5914 | |
bd214d13 | 5915 | /* Check whether we are allowed to reorder operands arg0 and arg1, |
5916 | such that the evaluation of arg1 occurs before arg0. */ | |
5917 | ||
5918 | static bool | |
5919 | reorder_operands_p (tree arg0, tree arg1) | |
5920 | { | |
5921 | if (! flag_evaluation_order) | |
0c5713a2 | 5922 | return true; |
bd214d13 | 5923 | if (TREE_CONSTANT (arg0) || TREE_CONSTANT (arg1)) |
5924 | return true; | |
5925 | return ! TREE_SIDE_EFFECTS (arg0) | |
5926 | && ! TREE_SIDE_EFFECTS (arg1); | |
5927 | } | |
5928 | ||
88e11d8f | 5929 | /* Test whether it is preferable two swap two operands, ARG0 and |
5930 | ARG1, for example because ARG0 is an integer constant and ARG1 | |
bd214d13 | 5931 | isn't. If REORDER is true, only recommend swapping if we can |
5932 | evaluate the operands in reverse order. */ | |
88e11d8f | 5933 | |
cc0bdf91 | 5934 | bool |
bd214d13 | 5935 | tree_swap_operands_p (tree arg0, tree arg1, bool reorder) |
88e11d8f | 5936 | { |
5937 | STRIP_SIGN_NOPS (arg0); | |
5938 | STRIP_SIGN_NOPS (arg1); | |
5939 | ||
5940 | if (TREE_CODE (arg1) == INTEGER_CST) | |
5941 | return 0; | |
5942 | if (TREE_CODE (arg0) == INTEGER_CST) | |
5943 | return 1; | |
5944 | ||
5945 | if (TREE_CODE (arg1) == REAL_CST) | |
5946 | return 0; | |
5947 | if (TREE_CODE (arg0) == REAL_CST) | |
5948 | return 1; | |
5949 | ||
5950 | if (TREE_CODE (arg1) == COMPLEX_CST) | |
5951 | return 0; | |
5952 | if (TREE_CODE (arg0) == COMPLEX_CST) | |
5953 | return 1; | |
5954 | ||
5955 | if (TREE_CONSTANT (arg1)) | |
5956 | return 0; | |
5957 | if (TREE_CONSTANT (arg0)) | |
5958 | return 1; | |
7206da1b | 5959 | |
f9464d30 | 5960 | if (optimize_size) |
5961 | return 0; | |
88e11d8f | 5962 | |
bd214d13 | 5963 | if (reorder && flag_evaluation_order |
5964 | && (TREE_SIDE_EFFECTS (arg0) || TREE_SIDE_EFFECTS (arg1))) | |
5965 | return 0; | |
5966 | ||
5967 | if (DECL_P (arg1)) | |
5968 | return 0; | |
5969 | if (DECL_P (arg0)) | |
5970 | return 1; | |
5971 | ||
cc0bdf91 | 5972 | /* It is preferable to swap two SSA_NAME to ensure a canonical form |
5973 | for commutative and comparison operators. Ensuring a canonical | |
5974 | form allows the optimizers to find additional redundancies without | |
5975 | having to explicitly check for both orderings. */ | |
5976 | if (TREE_CODE (arg0) == SSA_NAME | |
5977 | && TREE_CODE (arg1) == SSA_NAME | |
5978 | && SSA_NAME_VERSION (arg0) > SSA_NAME_VERSION (arg1)) | |
5979 | return 1; | |
5980 | ||
88e11d8f | 5981 | return 0; |
5982 | } | |
5983 | ||
faab57e3 | 5984 | /* Fold comparison ARG0 CODE ARG1 (with result in TYPE), where |
5985 | ARG0 is extended to a wider type. */ | |
5986 | ||
5987 | static tree | |
5988 | fold_widened_comparison (enum tree_code code, tree type, tree arg0, tree arg1) | |
5989 | { | |
5990 | tree arg0_unw = get_unwidened (arg0, NULL_TREE); | |
5991 | tree arg1_unw; | |
5992 | tree shorter_type, outer_type; | |
5993 | tree min, max; | |
5994 | bool above, below; | |
5995 | ||
5996 | if (arg0_unw == arg0) | |
5997 | return NULL_TREE; | |
5998 | shorter_type = TREE_TYPE (arg0_unw); | |
5999 | ||
6000 | arg1_unw = get_unwidened (arg1, shorter_type); | |
6001 | if (!arg1_unw) | |
6002 | return NULL_TREE; | |
6003 | ||
6004 | /* If possible, express the comparison in the shorter mode. */ | |
6005 | if ((code == EQ_EXPR || code == NE_EXPR | |
6006 | || TYPE_UNSIGNED (TREE_TYPE (arg0)) == TYPE_UNSIGNED (shorter_type)) | |
6007 | && (TREE_TYPE (arg1_unw) == shorter_type | |
6008 | || (TREE_CODE (arg1_unw) == INTEGER_CST | |
6009 | && int_fits_type_p (arg1_unw, shorter_type)))) | |
6010 | return fold (build (code, type, arg0_unw, | |
6011 | fold_convert (shorter_type, arg1_unw))); | |
6012 | ||
6013 | if (TREE_CODE (arg1_unw) != INTEGER_CST) | |
6014 | return NULL_TREE; | |
6015 | ||
6016 | /* If we are comparing with the integer that does not fit into the range | |
6017 | of the shorter type, the result is known. */ | |
6018 | outer_type = TREE_TYPE (arg1_unw); | |
6019 | min = lower_bound_in_type (outer_type, shorter_type); | |
6020 | max = upper_bound_in_type (outer_type, shorter_type); | |
6021 | ||
6022 | above = integer_nonzerop (fold_relational_const (LT_EXPR, type, | |
6023 | max, arg1_unw)); | |
6024 | below = integer_nonzerop (fold_relational_const (LT_EXPR, type, | |
6025 | arg1_unw, min)); | |
6026 | ||
6027 | switch (code) | |
6028 | { | |
6029 | case EQ_EXPR: | |
6030 | if (above || below) | |
6031 | return constant_boolean_node (false, type); | |
6032 | break; | |
6033 | ||
6034 | case NE_EXPR: | |
6035 | if (above || below) | |
6036 | return constant_boolean_node (true, type); | |
6037 | break; | |
6038 | ||
6039 | case LT_EXPR: | |
6040 | case LE_EXPR: | |
6041 | if (above) | |
6042 | return constant_boolean_node (true, type); | |
6043 | else if (below) | |
6044 | return constant_boolean_node (false, type);; | |
6045 | ||
6046 | case GT_EXPR: | |
6047 | case GE_EXPR: | |
6048 | if (above) | |
6049 | return constant_boolean_node (false, type); | |
6050 | else if (below) | |
6051 | return constant_boolean_node (true, type);; | |
6052 | ||
6053 | default: | |
6054 | break; | |
6055 | } | |
6056 | ||
6057 | return NULL_TREE; | |
6058 | } | |
6059 | ||
6060 | /* Fold comparison ARG0 CODE ARG1 (with result in TYPE), where for | |
6061 | ARG0 just the signedness is changed. */ | |
6062 | ||
6063 | static tree | |
6064 | fold_sign_changed_comparison (enum tree_code code, tree type, | |
6065 | tree arg0, tree arg1) | |
6066 | { | |
6067 | tree arg0_inner, tmp; | |
6068 | tree inner_type, outer_type; | |
6069 | ||
6070 | if (TREE_CODE (arg0) != NOP_EXPR) | |
6071 | return NULL_TREE; | |
6072 | ||
6073 | outer_type = TREE_TYPE (arg0); | |
6074 | arg0_inner = TREE_OPERAND (arg0, 0); | |
6075 | inner_type = TREE_TYPE (arg0_inner); | |
6076 | ||
6077 | if (TYPE_PRECISION (inner_type) != TYPE_PRECISION (outer_type)) | |
6078 | return NULL_TREE; | |
6079 | ||
6080 | if (TREE_CODE (arg1) != INTEGER_CST | |
6081 | && !(TREE_CODE (arg1) == NOP_EXPR | |
6082 | && TREE_TYPE (TREE_OPERAND (arg1, 0)) == inner_type)) | |
6083 | return NULL_TREE; | |
6084 | ||
6085 | if (TYPE_UNSIGNED (inner_type) != TYPE_UNSIGNED (outer_type) | |
6086 | && code != NE_EXPR | |
6087 | && code != EQ_EXPR) | |
6088 | return NULL_TREE; | |
6089 | ||
6090 | if (TREE_CODE (arg1) == INTEGER_CST) | |
6091 | { | |
6092 | tmp = build_int_cst_wide (inner_type, | |
6093 | TREE_INT_CST_LOW (arg1), | |
6094 | TREE_INT_CST_HIGH (arg1)); | |
6095 | arg1 = force_fit_type (tmp, 0, | |
6096 | TREE_OVERFLOW (arg1), | |
6097 | TREE_CONSTANT_OVERFLOW (arg1)); | |
6098 | } | |
6099 | else | |
6100 | arg1 = fold_convert (inner_type, arg1); | |
6101 | ||
6102 | return fold (build (code, type, arg0_inner, arg1)); | |
6103 | } | |
6104 | ||
dede8dcc | 6105 | /* Tries to replace &a[idx] CODE s * delta with &a[idx CODE delta], if s is |
6106 | step of the array. TYPE is the type of the expression. ADDR is the address. | |
6107 | MULT is the multiplicative expression. If the function succeeds, the new | |
6108 | address expression is returned. Otherwise NULL_TREE is returned. */ | |
6109 | ||
6110 | static tree | |
6111 | try_move_mult_to_index (tree type, enum tree_code code, tree addr, tree mult) | |
6112 | { | |
6113 | tree s, delta, step; | |
6114 | tree arg0 = TREE_OPERAND (mult, 0), arg1 = TREE_OPERAND (mult, 1); | |
6115 | tree ref = TREE_OPERAND (addr, 0), pref; | |
6116 | tree ret, pos; | |
6117 | tree itype; | |
6118 | ||
6119 | STRIP_NOPS (arg0); | |
6120 | STRIP_NOPS (arg1); | |
6121 | ||
6122 | if (TREE_CODE (arg0) == INTEGER_CST) | |
6123 | { | |
6124 | s = arg0; | |
6125 | delta = arg1; | |
6126 | } | |
6127 | else if (TREE_CODE (arg1) == INTEGER_CST) | |
6128 | { | |
6129 | s = arg1; | |
6130 | delta = arg0; | |
6131 | } | |
6132 | else | |
6133 | return NULL_TREE; | |
6134 | ||
6135 | for (;; ref = TREE_OPERAND (ref, 0)) | |
6136 | { | |
6137 | if (TREE_CODE (ref) == ARRAY_REF) | |
6138 | { | |
6139 | step = array_ref_element_size (ref); | |
6140 | ||
6141 | if (TREE_CODE (step) != INTEGER_CST) | |
6142 | continue; | |
6143 | ||
6144 | itype = TREE_TYPE (step); | |
6145 | ||
6146 | /* If the type sizes do not match, we might run into problems | |
6147 | when one of them would overflow. */ | |
6148 | if (TYPE_PRECISION (itype) != TYPE_PRECISION (type)) | |
6149 | continue; | |
6150 | ||
6151 | if (!operand_equal_p (step, fold_convert (itype, s), 0)) | |
6152 | continue; | |
6153 | ||
6154 | delta = fold_convert (itype, delta); | |
6155 | break; | |
6156 | } | |
6157 | ||
6158 | if (!handled_component_p (ref)) | |
6159 | return NULL_TREE; | |
6160 | } | |
6161 | ||
6162 | /* We found the suitable array reference. So copy everything up to it, | |
6163 | and replace the index. */ | |
6164 | ||
6165 | pref = TREE_OPERAND (addr, 0); | |
6166 | ret = copy_node (pref); | |
6167 | pos = ret; | |
6168 | ||
6169 | while (pref != ref) | |
6170 | { | |
6171 | pref = TREE_OPERAND (pref, 0); | |
6172 | TREE_OPERAND (pos, 0) = copy_node (pref); | |
6173 | pos = TREE_OPERAND (pos, 0); | |
6174 | } | |
6175 | ||
6176 | TREE_OPERAND (pos, 1) = fold (build2 (code, itype, | |
6177 | TREE_OPERAND (pos, 1), | |
6178 | delta)); | |
6179 | ||
6180 | return build1 (ADDR_EXPR, type, ret); | |
6181 | } | |
6182 | ||
2bc77e10 | 6183 | /* Perform constant folding and related simplification of EXPR. |
6184 | The related simplifications include x*1 => x, x*0 => 0, etc., | |
6185 | and application of the associative law. | |
6186 | NOP_EXPR conversions may be removed freely (as long as we | |
c4b03c0f | 6187 | are careful not to change the type of the overall expression). |
2bc77e10 | 6188 | We cannot simplify through a CONVERT_EXPR, FIX_EXPR or FLOAT_EXPR, |
6189 | but we can constant-fold them if they have constant operands. */ | |
6190 | ||
fc3df357 | 6191 | #ifdef ENABLE_FOLD_CHECKING |
6192 | # define fold(x) fold_1 (x) | |
6193 | static tree fold_1 (tree); | |
6194 | static | |
6195 | #endif | |
2bc77e10 | 6196 | tree |
de1b648b | 6197 | fold (tree expr) |
2bc77e10 | 6198 | { |
53f78329 | 6199 | const tree t = expr; |
2b03eaaf | 6200 | const tree type = TREE_TYPE (expr); |
2bc77e10 | 6201 | tree t1 = NULL_TREE; |
e233264a | 6202 | tree tem; |
19cb6b50 | 6203 | tree arg0 = NULL_TREE, arg1 = NULL_TREE; |
6204 | enum tree_code code = TREE_CODE (t); | |
ce45a448 | 6205 | enum tree_code_class kind = TREE_CODE_CLASS (code); |
4ee9c684 | 6206 | |
2bc77e10 | 6207 | /* WINS will be nonzero when the switch is done |
6208 | if all operands are constant. */ | |
2bc77e10 | 6209 | int wins = 1; |
6210 | ||
8541c166 | 6211 | /* Return right away if a constant. */ |
ce45a448 | 6212 | if (kind == tcc_constant) |
8541c166 | 6213 | return t; |
cc049fa3 | 6214 | |
233c0cbd | 6215 | if (code == NOP_EXPR || code == FLOAT_EXPR || code == CONVERT_EXPR) |
6216 | { | |
bb6b5123 | 6217 | tree subop; |
6218 | ||
233c0cbd | 6219 | /* Special case for conversion ops that can have fixed point args. */ |
6220 | arg0 = TREE_OPERAND (t, 0); | |
6221 | ||
6222 | /* Don't use STRIP_NOPS, because signedness of argument type matters. */ | |
6223 | if (arg0 != 0) | |
155b05dc | 6224 | STRIP_SIGN_NOPS (arg0); |
233c0cbd | 6225 | |
bb6b5123 | 6226 | if (arg0 != 0 && TREE_CODE (arg0) == COMPLEX_CST) |
6227 | subop = TREE_REALPART (arg0); | |
6228 | else | |
6229 | subop = arg0; | |
6230 | ||
6231 | if (subop != 0 && TREE_CODE (subop) != INTEGER_CST | |
88e11d8f | 6232 | && TREE_CODE (subop) != REAL_CST) |
233c0cbd | 6233 | /* Note that TREE_CONSTANT isn't enough: |
6234 | static var addresses are constant but we can't | |
6235 | do arithmetic on them. */ | |
6236 | wins = 0; | |
6237 | } | |
47549347 | 6238 | else if (IS_EXPR_CODE_CLASS (kind)) |
2bc77e10 | 6239 | { |
19cb6b50 | 6240 | int len = first_rtl_op (code); |
6241 | int i; | |
2bc77e10 | 6242 | for (i = 0; i < len; i++) |
6243 | { | |
6244 | tree op = TREE_OPERAND (t, i); | |
bb6b5123 | 6245 | tree subop; |
2bc77e10 | 6246 | |
6247 | if (op == 0) | |
6248 | continue; /* Valid for CALL_EXPR, at least. */ | |
6249 | ||
6f420099 | 6250 | /* Strip any conversions that don't change the mode. This is |
6251 | safe for every expression, except for a comparison expression | |
6252 | because its signedness is derived from its operands. So, in | |
6253 | the latter case, only strip conversions that don't change the | |
6254 | signedness. | |
6255 | ||
6256 | Note that this is done as an internal manipulation within the | |
6257 | constant folder, in order to find the simplest representation | |
6258 | of the arguments so that their form can be studied. In any | |
6259 | cases, the appropriate type conversions should be put back in | |
6260 | the tree that will get out of the constant folder. */ | |
ce45a448 | 6261 | if (kind == tcc_comparison) |
6f420099 | 6262 | STRIP_SIGN_NOPS (op); |
c2cbd9a8 | 6263 | else |
3a6656ad | 6264 | STRIP_NOPS (op); |
cc049fa3 | 6265 | |
bb6b5123 | 6266 | if (TREE_CODE (op) == COMPLEX_CST) |
6267 | subop = TREE_REALPART (op); | |
6268 | else | |
6269 | subop = op; | |
6270 | ||
6271 | if (TREE_CODE (subop) != INTEGER_CST | |
4268f174 | 6272 | && TREE_CODE (subop) != REAL_CST) |
2bc77e10 | 6273 | /* Note that TREE_CONSTANT isn't enough: |
6274 | static var addresses are constant but we can't | |
6275 | do arithmetic on them. */ | |
6276 | wins = 0; | |
6277 | ||
6278 | if (i == 0) | |
6279 | arg0 = op; | |
6280 | else if (i == 1) | |
6281 | arg1 = op; | |
6282 | } | |
6283 | } | |
6284 | ||
6285 | /* If this is a commutative operation, and ARG0 is a constant, move it | |
6286 | to ARG1 to reduce the number of tests below. */ | |
21dff555 | 6287 | if (commutative_tree_code (code) |
bd214d13 | 6288 | && tree_swap_operands_p (arg0, arg1, true)) |
fd96eeef | 6289 | return fold (build2 (code, type, TREE_OPERAND (t, 1), |
6290 | TREE_OPERAND (t, 0))); | |
2bc77e10 | 6291 | |
6292 | /* Now WINS is set as described above, | |
6293 | ARG0 is the first operand of EXPR, | |
6294 | and ARG1 is the second operand (if it has more than one operand). | |
6295 | ||
6296 | First check for cases where an arithmetic operation is applied to a | |
6297 | compound, conditional, or comparison operation. Push the arithmetic | |
6298 | operation inside the compound or conditional to see if any folding | |
6299 | can then be done. Convert comparison to conditional for this purpose. | |
6300 | The also optimizes non-constant cases that used to be done in | |
b5ab1edd | 6301 | expand_expr. |
6302 | ||
ea7a28cf | 6303 | Before we do that, see if this is a BIT_AND_EXPR or a BIT_IOR_EXPR, |
8b94828f | 6304 | one of the operands is a comparison and the other is a comparison, a |
6305 | BIT_AND_EXPR with the constant 1, or a truth value. In that case, the | |
6306 | code below would make the expression more complex. Change it to a | |
cc049fa3 | 6307 | TRUTH_{AND,OR}_EXPR. Likewise, convert a similar NE_EXPR to |
5c0dba00 | 6308 | TRUTH_XOR_EXPR and an EQ_EXPR to the inversion of a TRUTH_XOR_EXPR. */ |
b5ab1edd | 6309 | |
5c0dba00 | 6310 | if ((code == BIT_AND_EXPR || code == BIT_IOR_EXPR |
6311 | || code == EQ_EXPR || code == NE_EXPR) | |
8b94828f | 6312 | && ((truth_value_p (TREE_CODE (arg0)) |
6313 | && (truth_value_p (TREE_CODE (arg1)) | |
b5ab1edd | 6314 | || (TREE_CODE (arg1) == BIT_AND_EXPR |
6315 | && integer_onep (TREE_OPERAND (arg1, 1))))) | |
8b94828f | 6316 | || (truth_value_p (TREE_CODE (arg1)) |
6317 | && (truth_value_p (TREE_CODE (arg0)) | |
b5ab1edd | 6318 | || (TREE_CODE (arg0) == BIT_AND_EXPR |
6319 | && integer_onep (TREE_OPERAND (arg0, 1))))))) | |
5c0dba00 | 6320 | { |
fd96eeef | 6321 | tem = fold (build2 (code == BIT_AND_EXPR ? TRUTH_AND_EXPR |
6322 | : code == BIT_IOR_EXPR ? TRUTH_OR_EXPR | |
6323 | : TRUTH_XOR_EXPR, | |
6324 | type, fold_convert (boolean_type_node, arg0), | |
6325 | fold_convert (boolean_type_node, arg1))); | |
5c0dba00 | 6326 | |
6327 | if (code == EQ_EXPR) | |
53f78329 | 6328 | tem = invert_truthvalue (tem); |
5c0dba00 | 6329 | |
53f78329 | 6330 | return tem; |
5c0dba00 | 6331 | } |
b5ab1edd | 6332 | |
ce45a448 | 6333 | if (TREE_CODE_CLASS (code) == tcc_unary) |
2bc77e10 | 6334 | { |
6335 | if (TREE_CODE (arg0) == COMPOUND_EXPR) | |
fd96eeef | 6336 | return build2 (COMPOUND_EXPR, type, TREE_OPERAND (arg0, 0), |
6337 | fold (build1 (code, type, TREE_OPERAND (arg0, 1)))); | |
2bc77e10 | 6338 | else if (TREE_CODE (arg0) == COND_EXPR) |
abd9ac9c | 6339 | { |
09f309b8 | 6340 | tree arg01 = TREE_OPERAND (arg0, 1); |
6341 | tree arg02 = TREE_OPERAND (arg0, 2); | |
6342 | if (! VOID_TYPE_P (TREE_TYPE (arg01))) | |
6343 | arg01 = fold (build1 (code, type, arg01)); | |
6344 | if (! VOID_TYPE_P (TREE_TYPE (arg02))) | |
6345 | arg02 = fold (build1 (code, type, arg02)); | |
fd96eeef | 6346 | tem = fold (build3 (COND_EXPR, type, TREE_OPERAND (arg0, 0), |
6347 | arg01, arg02)); | |
abd9ac9c | 6348 | |
6349 | /* If this was a conversion, and all we did was to move into | |
2483911d | 6350 | inside the COND_EXPR, bring it back out. But leave it if |
6351 | it is a conversion from integer to integer and the | |
6352 | result precision is no wider than a word since such a | |
6353 | conversion is cheap and may be optimized away by combine, | |
6354 | while it couldn't if it were outside the COND_EXPR. Then return | |
6355 | so we don't get into an infinite recursion loop taking the | |
6356 | conversion out and then back in. */ | |
abd9ac9c | 6357 | |
6358 | if ((code == NOP_EXPR || code == CONVERT_EXPR | |
6359 | || code == NON_LVALUE_EXPR) | |
53f78329 | 6360 | && TREE_CODE (tem) == COND_EXPR |
6361 | && TREE_CODE (TREE_OPERAND (tem, 1)) == code | |
6362 | && TREE_CODE (TREE_OPERAND (tem, 2)) == code | |
6363 | && ! VOID_TYPE_P (TREE_OPERAND (tem, 1)) | |
6364 | && ! VOID_TYPE_P (TREE_OPERAND (tem, 2)) | |
6365 | && (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem, 1), 0)) | |
6366 | == TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem, 2), 0))) | |
6367 | && ! (INTEGRAL_TYPE_P (TREE_TYPE (tem)) | |
083a2b5e | 6368 | && (INTEGRAL_TYPE_P |
53f78329 | 6369 | (TREE_TYPE (TREE_OPERAND (TREE_OPERAND (tem, 1), 0)))) |
6370 | && TYPE_PRECISION (TREE_TYPE (tem)) <= BITS_PER_WORD)) | |
6371 | tem = build1 (code, type, | |
fd96eeef | 6372 | build3 (COND_EXPR, |
6373 | TREE_TYPE (TREE_OPERAND | |
6374 | (TREE_OPERAND (tem, 1), 0)), | |
6375 | TREE_OPERAND (tem, 0), | |
6376 | TREE_OPERAND (TREE_OPERAND (tem, 1), 0), | |
6377 | TREE_OPERAND (TREE_OPERAND (tem, 2), 0))); | |
53f78329 | 6378 | return tem; |
abd9ac9c | 6379 | } |
ce45a448 | 6380 | else if (COMPARISON_CLASS_P (arg0)) |
4ee9c684 | 6381 | { |
6382 | if (TREE_CODE (type) == BOOLEAN_TYPE) | |
6383 | { | |
6384 | arg0 = copy_node (arg0); | |
6385 | TREE_TYPE (arg0) = type; | |
6386 | return arg0; | |
6387 | } | |
6388 | else if (TREE_CODE (type) != INTEGER_TYPE) | |
fd96eeef | 6389 | return fold (build3 (COND_EXPR, type, arg0, |
6390 | fold (build1 (code, type, | |
6391 | integer_one_node)), | |
6392 | fold (build1 (code, type, | |
6393 | integer_zero_node)))); | |
4ee9c684 | 6394 | } |
2bc77e10 | 6395 | } |
ce45a448 | 6396 | else if (TREE_CODE_CLASS (code) == tcc_comparison |
d3221b32 | 6397 | && TREE_CODE (arg0) == COMPOUND_EXPR) |
fd96eeef | 6398 | return build2 (COMPOUND_EXPR, type, TREE_OPERAND (arg0, 0), |
6399 | fold (build2 (code, type, TREE_OPERAND (arg0, 1), arg1))); | |
ce45a448 | 6400 | else if (TREE_CODE_CLASS (code) == tcc_comparison |
d3221b32 | 6401 | && TREE_CODE (arg1) == COMPOUND_EXPR) |
fd96eeef | 6402 | return build2 (COMPOUND_EXPR, type, TREE_OPERAND (arg1, 0), |
6403 | fold (build2 (code, type, arg0, TREE_OPERAND (arg1, 1)))); | |
ce45a448 | 6404 | else if (TREE_CODE_CLASS (code) == tcc_binary |
6405 | || TREE_CODE_CLASS (code) == tcc_comparison) | |
2bc77e10 | 6406 | { |
a6661800 | 6407 | if (TREE_CODE (arg0) == COMPOUND_EXPR) |
fd96eeef | 6408 | return build2 (COMPOUND_EXPR, type, TREE_OPERAND (arg0, 0), |
6409 | fold (build2 (code, type, TREE_OPERAND (arg0, 1), | |
6410 | arg1))); | |
0a50b321 | 6411 | if (TREE_CODE (arg1) == COMPOUND_EXPR |
a6661800 | 6412 | && reorder_operands_p (arg0, TREE_OPERAND (arg1, 0))) |
fd96eeef | 6413 | return build2 (COMPOUND_EXPR, type, TREE_OPERAND (arg1, 0), |
6414 | fold (build2 (code, type, | |
6415 | arg0, TREE_OPERAND (arg1, 1)))); | |
a6661800 | 6416 | |
ce45a448 | 6417 | if (TREE_CODE (arg0) == COND_EXPR || COMPARISON_CLASS_P (arg0)) |
a6661800 | 6418 | { |
6419 | tem = fold_binary_op_with_conditional_arg (code, type, arg0, arg1, | |
6420 | /*cond_first_p=*/1); | |
6421 | if (tem != NULL_TREE) | |
6422 | return tem; | |
6423 | } | |
6424 | ||
ce45a448 | 6425 | if (TREE_CODE (arg1) == COND_EXPR || COMPARISON_CLASS_P (arg1)) |
a6661800 | 6426 | { |
6427 | tem = fold_binary_op_with_conditional_arg (code, type, arg1, arg0, | |
6428 | /*cond_first_p=*/0); | |
6429 | if (tem != NULL_TREE) | |
6430 | return tem; | |
6431 | } | |
2bc77e10 | 6432 | } |
cc049fa3 | 6433 | |
2bc77e10 | 6434 | switch (code) |
6435 | { | |
2bc77e10 | 6436 | case CONST_DECL: |
6437 | return fold (DECL_INITIAL (t)); | |
6438 | ||
6439 | case NOP_EXPR: | |
6440 | case FLOAT_EXPR: | |
6441 | case CONVERT_EXPR: | |
6442 | case FIX_TRUNC_EXPR: | |
04b253e8 | 6443 | case FIX_CEIL_EXPR: |
6444 | case FIX_FLOOR_EXPR: | |
50c90ea2 | 6445 | case FIX_ROUND_EXPR: |
2b03eaaf | 6446 | if (TREE_TYPE (TREE_OPERAND (t, 0)) == type) |
2483911d | 6447 | return TREE_OPERAND (t, 0); |
6448 | ||
fa4ebe56 | 6449 | /* Handle cases of two conversions in a row. */ |
6450 | if (TREE_CODE (TREE_OPERAND (t, 0)) == NOP_EXPR | |
6451 | || TREE_CODE (TREE_OPERAND (t, 0)) == CONVERT_EXPR) | |
6452 | { | |
6453 | tree inside_type = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (t, 0), 0)); | |
6454 | tree inter_type = TREE_TYPE (TREE_OPERAND (t, 0)); | |
fa4ebe56 | 6455 | int inside_int = INTEGRAL_TYPE_P (inside_type); |
cc58e392 | 6456 | int inside_ptr = POINTER_TYPE_P (inside_type); |
fa4ebe56 | 6457 | int inside_float = FLOAT_TYPE_P (inside_type); |
02e7a332 | 6458 | unsigned int inside_prec = TYPE_PRECISION (inside_type); |
78a8ed03 | 6459 | int inside_unsignedp = TYPE_UNSIGNED (inside_type); |
fa4ebe56 | 6460 | int inter_int = INTEGRAL_TYPE_P (inter_type); |
cc58e392 | 6461 | int inter_ptr = POINTER_TYPE_P (inter_type); |
fa4ebe56 | 6462 | int inter_float = FLOAT_TYPE_P (inter_type); |
02e7a332 | 6463 | unsigned int inter_prec = TYPE_PRECISION (inter_type); |
78a8ed03 | 6464 | int inter_unsignedp = TYPE_UNSIGNED (inter_type); |
041207ec | 6465 | int final_int = INTEGRAL_TYPE_P (type); |
6466 | int final_ptr = POINTER_TYPE_P (type); | |
6467 | int final_float = FLOAT_TYPE_P (type); | |
6468 | unsigned int final_prec = TYPE_PRECISION (type); | |
78a8ed03 | 6469 | int final_unsignedp = TYPE_UNSIGNED (type); |
fa4ebe56 | 6470 | |
cc049fa3 | 6471 | /* In addition to the cases of two conversions in a row |
fa4ebe56 | 6472 | handled below, if we are converting something to its own |
6473 | type via an object of identical or wider precision, neither | |
6474 | conversion is needed. */ | |
041207ec | 6475 | if (TYPE_MAIN_VARIANT (inside_type) == TYPE_MAIN_VARIANT (type) |
fa4ebe56 | 6476 | && ((inter_int && final_int) || (inter_float && final_float)) |
6477 | && inter_prec >= final_prec) | |
041207ec | 6478 | return fold (build1 (code, type, |
beecf0c3 | 6479 | TREE_OPERAND (TREE_OPERAND (t, 0), 0))); |
fa4ebe56 | 6480 | |
6481 | /* Likewise, if the intermediate and final types are either both | |
6482 | float or both integer, we don't need the middle conversion if | |
6483 | it is wider than the final type and doesn't change the signedness | |
cc58e392 | 6484 | (for integers). Avoid this if the final type is a pointer |
7cf60649 | 6485 | since then we sometimes need the inner conversion. Likewise if |
6486 | the outer has a precision not equal to the size of its mode. */ | |
fa4ebe56 | 6487 | if ((((inter_int || inter_ptr) && (inside_int || inside_ptr)) |
6488 | || (inter_float && inside_float)) | |
6489 | && inter_prec >= inside_prec | |
cc58e392 | 6490 | && (inter_float || inter_unsignedp == inside_unsignedp) |
041207ec | 6491 | && ! (final_prec != GET_MODE_BITSIZE (TYPE_MODE (type)) |
6492 | && TYPE_MODE (type) == TYPE_MODE (inter_type)) | |
cc58e392 | 6493 | && ! final_ptr) |
041207ec | 6494 | return fold (build1 (code, type, |
beecf0c3 | 6495 | TREE_OPERAND (TREE_OPERAND (t, 0), 0))); |
fa4ebe56 | 6496 | |
6800ce58 | 6497 | /* If we have a sign-extension of a zero-extended value, we can |
6498 | replace that by a single zero-extension. */ | |
6499 | if (inside_int && inter_int && final_int | |
6500 | && inside_prec < inter_prec && inter_prec < final_prec | |
6501 | && inside_unsignedp && !inter_unsignedp) | |
041207ec | 6502 | return fold (build1 (code, type, |
beecf0c3 | 6503 | TREE_OPERAND (TREE_OPERAND (t, 0), 0))); |
6800ce58 | 6504 | |
fa4ebe56 | 6505 | /* Two conversions in a row are not needed unless: |
6506 | - some conversion is floating-point (overstrict for now), or | |
6507 | - the intermediate type is narrower than both initial and | |
6508 | final, or | |
6509 | - the intermediate type and innermost type differ in signedness, | |
6510 | and the outermost type is wider than the intermediate, or | |
6511 | - the initial type is a pointer type and the precisions of the | |
6512 | intermediate and final types differ, or | |
cc049fa3 | 6513 | - the final type is a pointer type and the precisions of the |
fa4ebe56 | 6514 | initial and intermediate types differ. */ |
6515 | if (! inside_float && ! inter_float && ! final_float | |
6516 | && (inter_prec > inside_prec || inter_prec > final_prec) | |
6517 | && ! (inside_int && inter_int | |
6518 | && inter_unsignedp != inside_unsignedp | |
6519 | && inter_prec < final_prec) | |
6520 | && ((inter_unsignedp && inter_prec > inside_prec) | |
6521 | == (final_unsignedp && final_prec > inter_prec)) | |
6522 | && ! (inside_ptr && inter_prec != final_prec) | |
7cf60649 | 6523 | && ! (final_ptr && inside_prec != inter_prec) |
041207ec | 6524 | && ! (final_prec != GET_MODE_BITSIZE (TYPE_MODE (type)) |
6525 | && TYPE_MODE (type) == TYPE_MODE (inter_type)) | |
7cf60649 | 6526 | && ! final_ptr) |
041207ec | 6527 | return fold (build1 (code, type, |
beecf0c3 | 6528 | TREE_OPERAND (TREE_OPERAND (t, 0), 0))); |
fa4ebe56 | 6529 | } |
2bc77e10 | 6530 | |
6531 | if (TREE_CODE (TREE_OPERAND (t, 0)) == MODIFY_EXPR | |
e70afa40 | 6532 | && TREE_CONSTANT (TREE_OPERAND (TREE_OPERAND (t, 0), 1)) |
6533 | /* Detect assigning a bitfield. */ | |
6534 | && !(TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 0)) == COMPONENT_REF | |
6535 | && DECL_BIT_FIELD (TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (t, 0), 0), 1)))) | |
2bc77e10 | 6536 | { |
e70afa40 | 6537 | /* Don't leave an assignment inside a conversion |
eb2f80f3 | 6538 | unless assigning a bitfield. */ |
2bc77e10 | 6539 | tree prev = TREE_OPERAND (t, 0); |
53f78329 | 6540 | tem = copy_node (t); |
6541 | TREE_OPERAND (tem, 0) = TREE_OPERAND (prev, 1); | |
2bc77e10 | 6542 | /* First do the assignment, then return converted constant. */ |
fd96eeef | 6543 | tem = build2 (COMPOUND_EXPR, TREE_TYPE (tem), prev, fold (tem)); |
4ee9c684 | 6544 | TREE_NO_WARNING (tem) = 1; |
53f78329 | 6545 | TREE_USED (tem) = 1; |
6546 | return tem; | |
2bc77e10 | 6547 | } |
4c342eac | 6548 | |
6549 | /* Convert (T)(x & c) into (T)x & (T)c, if c is an integer | |
6550 | constants (if x has signed type, the sign bit cannot be set | |
6551 | in c). This folds extension into the BIT_AND_EXPR. */ | |
2b03eaaf | 6552 | if (INTEGRAL_TYPE_P (type) |
6553 | && TREE_CODE (type) != BOOLEAN_TYPE | |
4c342eac | 6554 | && TREE_CODE (TREE_OPERAND (t, 0)) == BIT_AND_EXPR |
6555 | && TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 1)) == INTEGER_CST) | |
6556 | { | |
6557 | tree and = TREE_OPERAND (t, 0); | |
6558 | tree and0 = TREE_OPERAND (and, 0), and1 = TREE_OPERAND (and, 1); | |
6559 | int change = 0; | |
6560 | ||
78a8ed03 | 6561 | if (TYPE_UNSIGNED (TREE_TYPE (and)) |
2b03eaaf | 6562 | || (TYPE_PRECISION (type) |
4c342eac | 6563 | <= TYPE_PRECISION (TREE_TYPE (and)))) |
6564 | change = 1; | |
6565 | else if (TYPE_PRECISION (TREE_TYPE (and1)) | |
6566 | <= HOST_BITS_PER_WIDE_INT | |
6567 | && host_integerp (and1, 1)) | |
6568 | { | |
6569 | unsigned HOST_WIDE_INT cst; | |
6570 | ||
6571 | cst = tree_low_cst (and1, 1); | |
6572 | cst &= (HOST_WIDE_INT) -1 | |
6573 | << (TYPE_PRECISION (TREE_TYPE (and1)) - 1); | |
6574 | change = (cst == 0); | |
6575 | #ifdef LOAD_EXTEND_OP | |
6576 | if (change | |
6577 | && (LOAD_EXTEND_OP (TYPE_MODE (TREE_TYPE (and0))) | |
6578 | == ZERO_EXTEND)) | |
6579 | { | |
fa8b888f | 6580 | tree uns = lang_hooks.types.unsigned_type (TREE_TYPE (and0)); |
b30e3dbc | 6581 | and0 = fold_convert (uns, and0); |
6582 | and1 = fold_convert (uns, and1); | |
4c342eac | 6583 | } |
6584 | #endif | |
6585 | } | |
6586 | if (change) | |
fd96eeef | 6587 | return fold (build2 (BIT_AND_EXPR, type, |
6588 | fold_convert (type, and0), | |
6589 | fold_convert (type, and1))); | |
4c342eac | 6590 | } |
6591 | ||
4ee9c684 | 6592 | /* Convert (T1)((T2)X op Y) into (T1)X op Y, for pointer types T1 and |
6593 | T2 being pointers to types of the same size. */ | |
6594 | if (POINTER_TYPE_P (TREE_TYPE (t)) | |
ce45a448 | 6595 | && BINARY_CLASS_P (arg0) |
4ee9c684 | 6596 | && TREE_CODE (TREE_OPERAND (arg0, 0)) == NOP_EXPR |
6597 | && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (arg0, 0)))) | |
6598 | { | |
6599 | tree arg00 = TREE_OPERAND (arg0, 0); | |
6600 | tree t0 = TREE_TYPE (t); | |
6601 | tree t1 = TREE_TYPE (arg00); | |
6602 | tree tt0 = TREE_TYPE (t0); | |
6603 | tree tt1 = TREE_TYPE (t1); | |
6604 | tree s0 = TYPE_SIZE (tt0); | |
6605 | tree s1 = TYPE_SIZE (tt1); | |
6606 | ||
6607 | if (s0 && s1 && operand_equal_p (s0, s1, OEP_ONLY_CONST)) | |
c0c67e38 | 6608 | return build2 (TREE_CODE (arg0), t0, fold_convert (t0, arg00), |
fd96eeef | 6609 | TREE_OPERAND (arg0, 1)); |
4ee9c684 | 6610 | } |
6611 | ||
2b03eaaf | 6612 | tem = fold_convert_const (code, type, arg0); |
04b253e8 | 6613 | return tem ? tem : t; |
2bc77e10 | 6614 | |
f96c43fb | 6615 | case VIEW_CONVERT_EXPR: |
6616 | if (TREE_CODE (TREE_OPERAND (t, 0)) == VIEW_CONVERT_EXPR) | |
6617 | return build1 (VIEW_CONVERT_EXPR, type, | |
6618 | TREE_OPERAND (TREE_OPERAND (t, 0), 0)); | |
6619 | return t; | |
6620 | ||
09a738e9 | 6621 | case COMPONENT_REF: |
ce3fb06e | 6622 | if (TREE_CODE (arg0) == CONSTRUCTOR |
6623 | && ! type_contains_placeholder_p (TREE_TYPE (arg0))) | |
f5541a8b | 6624 | { |
6625 | tree m = purpose_member (arg1, CONSTRUCTOR_ELTS (arg0)); | |
6626 | if (m) | |
53f78329 | 6627 | return TREE_VALUE (m); |
f5541a8b | 6628 | } |
09a738e9 | 6629 | return t; |
6630 | ||
2bc77e10 | 6631 | case RANGE_EXPR: |
fc3df357 | 6632 | if (TREE_CONSTANT (t) != wins) |
6633 | { | |
53f78329 | 6634 | tem = copy_node (t); |
6635 | TREE_CONSTANT (tem) = wins; | |
4ee9c684 | 6636 | TREE_INVARIANT (tem) = wins; |
53f78329 | 6637 | return tem; |
fc3df357 | 6638 | } |
2bc77e10 | 6639 | return t; |
6640 | ||
6641 | case NEGATE_EXPR: | |
bd214d13 | 6642 | if (negate_expr_p (arg0)) |
3bcc1a80 | 6643 | return fold_convert (type, negate_expr (arg0)); |
2bc77e10 | 6644 | return t; |
6645 | ||
6646 | case ABS_EXPR: | |
c183306c | 6647 | if (TREE_CODE (arg0) == INTEGER_CST || TREE_CODE (arg0) == REAL_CST) |
5221d284 | 6648 | return fold_abs_const (arg0, type); |
c63f4ad3 | 6649 | else if (TREE_CODE (arg0) == NEGATE_EXPR) |
6650 | return fold (build1 (ABS_EXPR, type, TREE_OPERAND (arg0, 0))); | |
25bf8ba3 | 6651 | /* Convert fabs((double)float) into (double)fabsf(float). */ |
6652 | else if (TREE_CODE (arg0) == NOP_EXPR | |
6653 | && TREE_CODE (type) == REAL_TYPE) | |
6654 | { | |
6655 | tree targ0 = strip_float_extensions (arg0); | |
6656 | if (targ0 != arg0) | |
b30e3dbc | 6657 | return fold_convert (type, fold (build1 (ABS_EXPR, |
6658 | TREE_TYPE (targ0), | |
6659 | targ0))); | |
805e22b2 | 6660 | } |
c63f4ad3 | 6661 | else if (tree_expr_nonnegative_p (arg0)) |
6662 | return arg0; | |
2bc77e10 | 6663 | return t; |
6664 | ||
03aa4df2 | 6665 | case CONJ_EXPR: |
6666 | if (TREE_CODE (TREE_TYPE (arg0)) != COMPLEX_TYPE) | |
b30e3dbc | 6667 | return fold_convert (type, arg0); |
03aa4df2 | 6668 | else if (TREE_CODE (arg0) == COMPLEX_EXPR) |
fd96eeef | 6669 | return build2 (COMPLEX_EXPR, type, |
6670 | TREE_OPERAND (arg0, 0), | |
6671 | negate_expr (TREE_OPERAND (arg0, 1))); | |
03aa4df2 | 6672 | else if (TREE_CODE (arg0) == COMPLEX_CST) |
8b3ab5d0 | 6673 | return build_complex (type, TREE_REALPART (arg0), |
6674 | negate_expr (TREE_IMAGPART (arg0))); | |
03aa4df2 | 6675 | else if (TREE_CODE (arg0) == PLUS_EXPR || TREE_CODE (arg0) == MINUS_EXPR) |
fd96eeef | 6676 | return fold (build2 (TREE_CODE (arg0), type, |
6677 | fold (build1 (CONJ_EXPR, type, | |
6678 | TREE_OPERAND (arg0, 0))), | |
6679 | fold (build1 (CONJ_EXPR, type, | |
6680 | TREE_OPERAND (arg0, 1))))); | |
03aa4df2 | 6681 | else if (TREE_CODE (arg0) == CONJ_EXPR) |
6682 | return TREE_OPERAND (arg0, 0); | |
6683 | return t; | |
6684 | ||
2bc77e10 | 6685 | case BIT_NOT_EXPR: |
c183306c | 6686 | if (TREE_CODE (arg0) == INTEGER_CST) |
6687 | return fold_not_const (arg0, type); | |
2bc77e10 | 6688 | else if (TREE_CODE (arg0) == BIT_NOT_EXPR) |
6689 | return TREE_OPERAND (arg0, 0); | |
6690 | return t; | |
6691 | ||
6692 | case PLUS_EXPR: | |
6693 | /* A + (-B) -> A - B */ | |
6694 | if (TREE_CODE (arg1) == NEGATE_EXPR) | |
fd96eeef | 6695 | return fold (build2 (MINUS_EXPR, type, arg0, TREE_OPERAND (arg1, 0))); |
88b41b10 | 6696 | /* (-A) + B -> B - A */ |
38e9cdc3 | 6697 | if (TREE_CODE (arg0) == NEGATE_EXPR |
6698 | && reorder_operands_p (TREE_OPERAND (arg0, 0), arg1)) | |
fd96eeef | 6699 | return fold (build2 (MINUS_EXPR, type, arg1, TREE_OPERAND (arg0, 0))); |
38e9cdc3 | 6700 | if (! FLOAT_TYPE_P (type)) |
2bc77e10 | 6701 | { |
6702 | if (integer_zerop (arg1)) | |
b30e3dbc | 6703 | return non_lvalue (fold_convert (type, arg0)); |
2bc77e10 | 6704 | |
6705 | /* If we are adding two BIT_AND_EXPR's, both of which are and'ing | |
6706 | with a constant, and the two constants have no bits in common, | |
6707 | we should treat this as a BIT_IOR_EXPR since this may produce more | |
6708 | simplifications. */ | |
6709 | if (TREE_CODE (arg0) == BIT_AND_EXPR | |
6710 | && TREE_CODE (arg1) == BIT_AND_EXPR | |
6711 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST | |
6712 | && TREE_CODE (TREE_OPERAND (arg1, 1)) == INTEGER_CST | |
6713 | && integer_zerop (const_binop (BIT_AND_EXPR, | |
6714 | TREE_OPERAND (arg0, 1), | |
5485823f | 6715 | TREE_OPERAND (arg1, 1), 0))) |
2bc77e10 | 6716 | { |
6717 | code = BIT_IOR_EXPR; | |
6718 | goto bit_ior; | |
6719 | } | |
e4142c0f | 6720 | |
578e821c | 6721 | /* Reassociate (plus (plus (mult) (foo)) (mult)) as |
cc049fa3 | 6722 | (plus (plus (mult) (mult)) (foo)) so that we can |
578e821c | 6723 | take advantage of the factoring cases below. */ |
97c2d44f | 6724 | if (((TREE_CODE (arg0) == PLUS_EXPR |
6725 | || TREE_CODE (arg0) == MINUS_EXPR) | |
578e821c | 6726 | && TREE_CODE (arg1) == MULT_EXPR) |
97c2d44f | 6727 | || ((TREE_CODE (arg1) == PLUS_EXPR |
6728 | || TREE_CODE (arg1) == MINUS_EXPR) | |
cc049fa3 | 6729 | && TREE_CODE (arg0) == MULT_EXPR)) |
578e821c | 6730 | { |
6731 | tree parg0, parg1, parg, marg; | |
97c2d44f | 6732 | enum tree_code pcode; |
578e821c | 6733 | |
97c2d44f | 6734 | if (TREE_CODE (arg1) == MULT_EXPR) |
578e821c | 6735 | parg = arg0, marg = arg1; |
6736 | else | |
6737 | parg = arg1, marg = arg0; | |
97c2d44f | 6738 | pcode = TREE_CODE (parg); |
578e821c | 6739 | parg0 = TREE_OPERAND (parg, 0); |
6740 | parg1 = TREE_OPERAND (parg, 1); | |
6741 | STRIP_NOPS (parg0); | |
6742 | STRIP_NOPS (parg1); | |
6743 | ||
6744 | if (TREE_CODE (parg0) == MULT_EXPR | |
6745 | && TREE_CODE (parg1) != MULT_EXPR) | |
97c2d44f | 6746 | return fold (build2 (pcode, type, |
fd96eeef | 6747 | fold (build2 (PLUS_EXPR, type, |
6748 | fold_convert (type, parg0), | |
6749 | fold_convert (type, marg))), | |
6750 | fold_convert (type, parg1))); | |
578e821c | 6751 | if (TREE_CODE (parg0) != MULT_EXPR |
6752 | && TREE_CODE (parg1) == MULT_EXPR) | |
fd96eeef | 6753 | return fold (build2 (PLUS_EXPR, type, |
97c2d44f | 6754 | fold_convert (type, parg0), |
6755 | fold (build2 (pcode, type, | |
6756 | fold_convert (type, marg), | |
6757 | fold_convert (type, | |
6758 | parg1))))); | |
578e821c | 6759 | } |
6760 | ||
1d322a97 | 6761 | if (TREE_CODE (arg0) == MULT_EXPR && TREE_CODE (arg1) == MULT_EXPR) |
6762 | { | |
6763 | tree arg00, arg01, arg10, arg11; | |
5b7dad94 | 6764 | tree alt0 = NULL_TREE, alt1 = NULL_TREE, same; |
1d322a97 | 6765 | |
6766 | /* (A * C) + (B * C) -> (A+B) * C. | |
6767 | We are most concerned about the case where C is a constant, | |
6768 | but other combinations show up during loop reduction. Since | |
6769 | it is not difficult, try all four possibilities. */ | |
6770 | ||
6771 | arg00 = TREE_OPERAND (arg0, 0); | |
6772 | arg01 = TREE_OPERAND (arg0, 1); | |
6773 | arg10 = TREE_OPERAND (arg1, 0); | |
6774 | arg11 = TREE_OPERAND (arg1, 1); | |
6775 | same = NULL_TREE; | |
6776 | ||
6777 | if (operand_equal_p (arg01, arg11, 0)) | |
6778 | same = arg01, alt0 = arg00, alt1 = arg10; | |
6779 | else if (operand_equal_p (arg00, arg10, 0)) | |
6780 | same = arg00, alt0 = arg01, alt1 = arg11; | |
6781 | else if (operand_equal_p (arg00, arg11, 0)) | |
6782 | same = arg00, alt0 = arg01, alt1 = arg10; | |
6783 | else if (operand_equal_p (arg01, arg10, 0)) | |
6784 | same = arg01, alt0 = arg00, alt1 = arg11; | |
6785 | ||
578e821c | 6786 | /* No identical multiplicands; see if we can find a common |
6787 | power-of-two factor in non-power-of-two multiplies. This | |
6788 | can help in multi-dimensional array access. */ | |
6789 | else if (TREE_CODE (arg01) == INTEGER_CST | |
6790 | && TREE_CODE (arg11) == INTEGER_CST | |
6791 | && TREE_INT_CST_HIGH (arg01) == 0 | |
6792 | && TREE_INT_CST_HIGH (arg11) == 0) | |
6793 | { | |
6794 | HOST_WIDE_INT int01, int11, tmp; | |
6795 | int01 = TREE_INT_CST_LOW (arg01); | |
6796 | int11 = TREE_INT_CST_LOW (arg11); | |
6797 | ||
6798 | /* Move min of absolute values to int11. */ | |
6799 | if ((int01 >= 0 ? int01 : -int01) | |
6800 | < (int11 >= 0 ? int11 : -int11)) | |
6801 | { | |
6802 | tmp = int01, int01 = int11, int11 = tmp; | |
6803 | alt0 = arg00, arg00 = arg10, arg10 = alt0; | |
6804 | alt0 = arg01, arg01 = arg11, arg11 = alt0; | |
6805 | } | |
6806 | ||
6807 | if (exact_log2 (int11) > 0 && int01 % int11 == 0) | |
6808 | { | |
fd96eeef | 6809 | alt0 = fold (build2 (MULT_EXPR, type, arg00, |
7c446c95 | 6810 | build_int_cst (NULL_TREE, |
7016c612 | 6811 | int01 / int11))); |
578e821c | 6812 | alt1 = arg10; |
6813 | same = arg11; | |
6814 | } | |
6815 | } | |
6816 | ||
1d322a97 | 6817 | if (same) |
fd96eeef | 6818 | return fold (build2 (MULT_EXPR, type, |
6819 | fold (build2 (PLUS_EXPR, type, | |
97c2d44f | 6820 | fold_convert (type, alt0), |
6821 | fold_convert (type, alt1))), | |
fd96eeef | 6822 | same)); |
1d322a97 | 6823 | } |
dede8dcc | 6824 | |
6825 | /* Try replacing &a[i1] + c * i2 with &a[i1 + i2], if c is step | |
6826 | of the array. Loop optimizer sometimes produce this type of | |
6827 | expressions. */ | |
6828 | if (TREE_CODE (arg0) == ADDR_EXPR | |
6829 | && TREE_CODE (arg1) == MULT_EXPR) | |
6830 | { | |
6831 | tem = try_move_mult_to_index (type, PLUS_EXPR, arg0, arg1); | |
6832 | if (tem) | |
6833 | return fold (tem); | |
6834 | } | |
6835 | else if (TREE_CODE (arg1) == ADDR_EXPR | |
6836 | && TREE_CODE (arg0) == MULT_EXPR) | |
6837 | { | |
6838 | tem = try_move_mult_to_index (type, PLUS_EXPR, arg1, arg0); | |
6839 | if (tem) | |
6840 | return fold (tem); | |
6841 | } | |
2bc77e10 | 6842 | } |
cf58ef1d | 6843 | else |
6844 | { | |
6845 | /* See if ARG1 is zero and X + ARG1 reduces to X. */ | |
6846 | if (fold_real_zero_addition_p (TREE_TYPE (arg0), arg1, 0)) | |
b30e3dbc | 6847 | return non_lvalue (fold_convert (type, arg0)); |
920d0fb5 | 6848 | |
cf58ef1d | 6849 | /* Likewise if the operands are reversed. */ |
6850 | if (fold_real_zero_addition_p (TREE_TYPE (arg1), arg0, 0)) | |
b30e3dbc | 6851 | return non_lvalue (fold_convert (type, arg1)); |
cf58ef1d | 6852 | |
94721878 | 6853 | /* Convert X + -C into X - C. */ |
6854 | if (TREE_CODE (arg1) == REAL_CST | |
6855 | && REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg1))) | |
6856 | { | |
6857 | tem = fold_negate_const (arg1, type); | |
6858 | if (!TREE_OVERFLOW (arg1) || !flag_trapping_math) | |
6859 | return fold (build2 (MINUS_EXPR, type, | |
6860 | fold_convert (type, arg0), | |
6861 | fold_convert (type, tem))); | |
6862 | } | |
6863 | ||
cf58ef1d | 6864 | /* Convert x+x into x*2.0. */ |
4b69983d | 6865 | if (operand_equal_p (arg0, arg1, 0) |
6866 | && SCALAR_FLOAT_TYPE_P (type)) | |
fd96eeef | 6867 | return fold (build2 (MULT_EXPR, type, arg0, |
6868 | build_real (type, dconst2))); | |
cf58ef1d | 6869 | |
6870 | /* Convert x*c+x into x*(c+1). */ | |
6871 | if (flag_unsafe_math_optimizations | |
6872 | && TREE_CODE (arg0) == MULT_EXPR | |
6873 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == REAL_CST | |
6874 | && ! TREE_CONSTANT_OVERFLOW (TREE_OPERAND (arg0, 1)) | |
6875 | && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0)) | |
6876 | { | |
6877 | REAL_VALUE_TYPE c; | |
6878 | ||
6879 | c = TREE_REAL_CST (TREE_OPERAND (arg0, 1)); | |
6880 | real_arithmetic (&c, PLUS_EXPR, &c, &dconst1); | |
fd96eeef | 6881 | return fold (build2 (MULT_EXPR, type, arg1, |
6882 | build_real (type, c))); | |
cf58ef1d | 6883 | } |
6884 | ||
6885 | /* Convert x+x*c into x*(c+1). */ | |
6886 | if (flag_unsafe_math_optimizations | |
6887 | && TREE_CODE (arg1) == MULT_EXPR | |
6888 | && TREE_CODE (TREE_OPERAND (arg1, 1)) == REAL_CST | |
6889 | && ! TREE_CONSTANT_OVERFLOW (TREE_OPERAND (arg1, 1)) | |
6890 | && operand_equal_p (TREE_OPERAND (arg1, 0), arg0, 0)) | |
6891 | { | |
6892 | REAL_VALUE_TYPE c; | |
88b41b10 | 6893 | |
cf58ef1d | 6894 | c = TREE_REAL_CST (TREE_OPERAND (arg1, 1)); |
6895 | real_arithmetic (&c, PLUS_EXPR, &c, &dconst1); | |
fd96eeef | 6896 | return fold (build2 (MULT_EXPR, type, arg0, |
6897 | build_real (type, c))); | |
cf58ef1d | 6898 | } |
6899 | ||
6900 | /* Convert x*c1+x*c2 into x*(c1+c2). */ | |
6901 | if (flag_unsafe_math_optimizations | |
6902 | && TREE_CODE (arg0) == MULT_EXPR | |
6903 | && TREE_CODE (arg1) == MULT_EXPR | |
6904 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == REAL_CST | |
6905 | && ! TREE_CONSTANT_OVERFLOW (TREE_OPERAND (arg0, 1)) | |
6906 | && TREE_CODE (TREE_OPERAND (arg1, 1)) == REAL_CST | |
6907 | && ! TREE_CONSTANT_OVERFLOW (TREE_OPERAND (arg1, 1)) | |
6908 | && operand_equal_p (TREE_OPERAND (arg0, 0), | |
6909 | TREE_OPERAND (arg1, 0), 0)) | |
6910 | { | |
6911 | REAL_VALUE_TYPE c1, c2; | |
6912 | ||
6913 | c1 = TREE_REAL_CST (TREE_OPERAND (arg0, 1)); | |
6914 | c2 = TREE_REAL_CST (TREE_OPERAND (arg1, 1)); | |
6915 | real_arithmetic (&c1, PLUS_EXPR, &c1, &c2); | |
fd96eeef | 6916 | return fold (build2 (MULT_EXPR, type, |
6917 | TREE_OPERAND (arg0, 0), | |
6918 | build_real (type, c1))); | |
cf58ef1d | 6919 | } |
778ac06a | 6920 | /* Convert a + (b*c + d*e) into (a + b*c) + d*e. */ |
edbb2b78 | 6921 | if (flag_unsafe_math_optimizations |
6922 | && TREE_CODE (arg1) == PLUS_EXPR | |
6923 | && TREE_CODE (arg0) != MULT_EXPR) | |
6924 | { | |
6925 | tree tree10 = TREE_OPERAND (arg1, 0); | |
6926 | tree tree11 = TREE_OPERAND (arg1, 1); | |
6927 | if (TREE_CODE (tree11) == MULT_EXPR | |
6928 | && TREE_CODE (tree10) == MULT_EXPR) | |
6929 | { | |
6930 | tree tree0; | |
fd96eeef | 6931 | tree0 = fold (build2 (PLUS_EXPR, type, arg0, tree10)); |
6932 | return fold (build2 (PLUS_EXPR, type, tree0, tree11)); | |
edbb2b78 | 6933 | } |
6934 | } | |
778ac06a | 6935 | /* Convert (b*c + d*e) + a into b*c + (d*e +a). */ |
edbb2b78 | 6936 | if (flag_unsafe_math_optimizations |
6937 | && TREE_CODE (arg0) == PLUS_EXPR | |
6938 | && TREE_CODE (arg1) != MULT_EXPR) | |
6939 | { | |
6940 | tree tree00 = TREE_OPERAND (arg0, 0); | |
6941 | tree tree01 = TREE_OPERAND (arg0, 1); | |
6942 | if (TREE_CODE (tree01) == MULT_EXPR | |
6943 | && TREE_CODE (tree00) == MULT_EXPR) | |
6944 | { | |
6945 | tree tree0; | |
fd96eeef | 6946 | tree0 = fold (build2 (PLUS_EXPR, type, tree01, arg1)); |
6947 | return fold (build2 (PLUS_EXPR, type, tree00, tree0)); | |
edbb2b78 | 6948 | } |
6949 | } | |
cf58ef1d | 6950 | } |
920d0fb5 | 6951 | |
0e1e143e | 6952 | bit_rotate: |
6953 | /* (A << C1) + (A >> C2) if A is unsigned and C1+C2 is the size of A | |
6954 | is a rotate of A by C1 bits. */ | |
6955 | /* (A << B) + (A >> (Z - B)) if A is unsigned and Z is the size of A | |
6956 | is a rotate of A by B bits. */ | |
6957 | { | |
19cb6b50 | 6958 | enum tree_code code0, code1; |
cc049fa3 | 6959 | code0 = TREE_CODE (arg0); |
6960 | code1 = TREE_CODE (arg1); | |
6961 | if (((code0 == RSHIFT_EXPR && code1 == LSHIFT_EXPR) | |
6962 | || (code1 == RSHIFT_EXPR && code0 == LSHIFT_EXPR)) | |
0e1e143e | 6963 | && operand_equal_p (TREE_OPERAND (arg0, 0), |
cc049fa3 | 6964 | TREE_OPERAND (arg1, 0), 0) |
78a8ed03 | 6965 | && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg0, 0)))) |
0e1e143e | 6966 | { |
19cb6b50 | 6967 | tree tree01, tree11; |
6968 | enum tree_code code01, code11; | |
0e1e143e | 6969 | |
6970 | tree01 = TREE_OPERAND (arg0, 1); | |
6971 | tree11 = TREE_OPERAND (arg1, 1); | |
6972 | STRIP_NOPS (tree01); | |
6973 | STRIP_NOPS (tree11); | |
6974 | code01 = TREE_CODE (tree01); | |
6975 | code11 = TREE_CODE (tree11); | |
6976 | if (code01 == INTEGER_CST | |
cc049fa3 | 6977 | && code11 == INTEGER_CST |
6978 | && TREE_INT_CST_HIGH (tree01) == 0 | |
6979 | && TREE_INT_CST_HIGH (tree11) == 0 | |
6980 | && ((TREE_INT_CST_LOW (tree01) + TREE_INT_CST_LOW (tree11)) | |
6981 | == TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (arg0, 0))))) | |
fd96eeef | 6982 | return build2 (LROTATE_EXPR, type, TREE_OPERAND (arg0, 0), |
6983 | code0 == LSHIFT_EXPR ? tree01 : tree11); | |
0e1e143e | 6984 | else if (code11 == MINUS_EXPR) |
6985 | { | |
cc049fa3 | 6986 | tree tree110, tree111; |
6987 | tree110 = TREE_OPERAND (tree11, 0); | |
6988 | tree111 = TREE_OPERAND (tree11, 1); | |
6989 | STRIP_NOPS (tree110); | |
6990 | STRIP_NOPS (tree111); | |
6991 | if (TREE_CODE (tree110) == INTEGER_CST | |
a0c2c45b | 6992 | && 0 == compare_tree_int (tree110, |
6993 | TYPE_PRECISION | |
6994 | (TREE_TYPE (TREE_OPERAND | |
6995 | (arg0, 0)))) | |
0e1e143e | 6996 | && operand_equal_p (tree01, tree111, 0)) |
fd96eeef | 6997 | return build2 ((code0 == LSHIFT_EXPR |
6998 | ? LROTATE_EXPR | |
6999 | : RROTATE_EXPR), | |
7000 | type, TREE_OPERAND (arg0, 0), tree01); | |
0e1e143e | 7001 | } |
7002 | else if (code01 == MINUS_EXPR) | |
7003 | { | |
cc049fa3 | 7004 | tree tree010, tree011; |
7005 | tree010 = TREE_OPERAND (tree01, 0); | |
7006 | tree011 = TREE_OPERAND (tree01, 1); | |
7007 | STRIP_NOPS (tree010); | |
7008 | STRIP_NOPS (tree011); | |
7009 | if (TREE_CODE (tree010) == INTEGER_CST | |
a0c2c45b | 7010 | && 0 == compare_tree_int (tree010, |
7011 | TYPE_PRECISION | |
7012 | (TREE_TYPE (TREE_OPERAND | |
7013 | (arg0, 0)))) | |
0e1e143e | 7014 | && operand_equal_p (tree11, tree011, 0)) |
fd96eeef | 7015 | return build2 ((code0 != LSHIFT_EXPR |
7016 | ? LROTATE_EXPR | |
7017 | : RROTATE_EXPR), | |
7018 | type, TREE_OPERAND (arg0, 0), tree11); | |
0e1e143e | 7019 | } |
7020 | } | |
7021 | } | |
88b41b10 | 7022 | |
2bc77e10 | 7023 | associate: |
23ec2d5e | 7024 | /* In most languages, can't associate operations on floats through |
7025 | parentheses. Rather than remember where the parentheses were, we | |
c9192f9a | 7026 | don't associate floats at all, unless the user has specified |
7027 | -funsafe-math-optimizations. */ | |
23ec2d5e | 7028 | |
7029 | if (! wins | |
c9192f9a | 7030 | && (! FLOAT_TYPE_P (type) || flag_unsafe_math_optimizations)) |
2bc77e10 | 7031 | { |
b07ba9ff | 7032 | tree var0, con0, lit0, minus_lit0; |
7033 | tree var1, con1, lit1, minus_lit1; | |
23ec2d5e | 7034 | |
7035 | /* Split both trees into variables, constants, and literals. Then | |
7036 | associate each group together, the constants with literals, | |
7037 | then the result with variables. This increases the chances of | |
7038 | literals being recombined later and of generating relocatable | |
6312a35e | 7039 | expressions for the sum of a constant and literal. */ |
b07ba9ff | 7040 | var0 = split_tree (arg0, code, &con0, &lit0, &minus_lit0, 0); |
7041 | var1 = split_tree (arg1, code, &con1, &lit1, &minus_lit1, | |
7042 | code == MINUS_EXPR); | |
23ec2d5e | 7043 | |
7044 | /* Only do something if we found more than two objects. Otherwise, | |
7045 | nothing has changed and we risk infinite recursion. */ | |
b07ba9ff | 7046 | if (2 < ((var0 != 0) + (var1 != 0) |
7047 | + (con0 != 0) + (con1 != 0) | |
7048 | + (lit0 != 0) + (lit1 != 0) | |
7049 | + (minus_lit0 != 0) + (minus_lit1 != 0))) | |
2bc77e10 | 7050 | { |
b07ba9ff | 7051 | /* Recombine MINUS_EXPR operands by using PLUS_EXPR. */ |
7052 | if (code == MINUS_EXPR) | |
7053 | code = PLUS_EXPR; | |
7054 | ||
23ec2d5e | 7055 | var0 = associate_trees (var0, var1, code, type); |
7056 | con0 = associate_trees (con0, con1, code, type); | |
7057 | lit0 = associate_trees (lit0, lit1, code, type); | |
b07ba9ff | 7058 | minus_lit0 = associate_trees (minus_lit0, minus_lit1, code, type); |
7059 | ||
7060 | /* Preserve the MINUS_EXPR if the negative part of the literal is | |
7061 | greater than the positive part. Otherwise, the multiplicative | |
7062 | folding code (i.e extract_muldiv) may be fooled in case | |
d01481af | 7063 | unsigned constants are subtracted, like in the following |
b07ba9ff | 7064 | example: ((X*2 + 4) - 8U)/2. */ |
7065 | if (minus_lit0 && lit0) | |
7066 | { | |
1aa79290 | 7067 | if (TREE_CODE (lit0) == INTEGER_CST |
7068 | && TREE_CODE (minus_lit0) == INTEGER_CST | |
7069 | && tree_int_cst_lt (lit0, minus_lit0)) | |
b07ba9ff | 7070 | { |
7071 | minus_lit0 = associate_trees (minus_lit0, lit0, | |
7072 | MINUS_EXPR, type); | |
7073 | lit0 = 0; | |
7074 | } | |
7075 | else | |
7076 | { | |
7077 | lit0 = associate_trees (lit0, minus_lit0, | |
7078 | MINUS_EXPR, type); | |
7079 | minus_lit0 = 0; | |
7080 | } | |
7081 | } | |
7082 | if (minus_lit0) | |
7083 | { | |
7084 | if (con0 == 0) | |
b30e3dbc | 7085 | return fold_convert (type, |
7086 | associate_trees (var0, minus_lit0, | |
7087 | MINUS_EXPR, type)); | |
b07ba9ff | 7088 | else |
7089 | { | |
7090 | con0 = associate_trees (con0, minus_lit0, | |
7091 | MINUS_EXPR, type); | |
b30e3dbc | 7092 | return fold_convert (type, |
7093 | associate_trees (var0, con0, | |
7094 | PLUS_EXPR, type)); | |
b07ba9ff | 7095 | } |
7096 | } | |
7097 | ||
23ec2d5e | 7098 | con0 = associate_trees (con0, lit0, code, type); |
b30e3dbc | 7099 | return fold_convert (type, associate_trees (var0, con0, |
7100 | code, type)); | |
2bc77e10 | 7101 | } |
7102 | } | |
23ec2d5e | 7103 | |
2bc77e10 | 7104 | binary: |
2bc77e10 | 7105 | if (wins) |
5485823f | 7106 | t1 = const_binop (code, arg0, arg1, 0); |
2bc77e10 | 7107 | if (t1 != NULL_TREE) |
7108 | { | |
7109 | /* The return value should always have | |
7110 | the same type as the original expression. */ | |
2b03eaaf | 7111 | if (TREE_TYPE (t1) != type) |
7112 | t1 = fold_convert (type, t1); | |
a3f1e3ec | 7113 | |
2bc77e10 | 7114 | return t1; |
7115 | } | |
7116 | return t; | |
7117 | ||
7118 | case MINUS_EXPR: | |
88b41b10 | 7119 | /* A - (-B) -> A + B */ |
7120 | if (TREE_CODE (arg1) == NEGATE_EXPR) | |
fd96eeef | 7121 | return fold (build2 (PLUS_EXPR, type, arg0, TREE_OPERAND (arg1, 0))); |
22331643 | 7122 | /* (-A) - B -> (-B) - A where B is easily negated and we can swap. */ |
7123 | if (TREE_CODE (arg0) == NEGATE_EXPR | |
b24bee03 | 7124 | && (FLOAT_TYPE_P (type) |
7125 | || (INTEGRAL_TYPE_P (type) && flag_wrapv && !flag_trapv)) | |
22331643 | 7126 | && negate_expr_p (arg1) |
bd214d13 | 7127 | && reorder_operands_p (arg0, arg1)) |
fd96eeef | 7128 | return fold (build2 (MINUS_EXPR, type, negate_expr (arg1), |
7129 | TREE_OPERAND (arg0, 0))); | |
88b41b10 | 7130 | |
780a4395 | 7131 | if (! FLOAT_TYPE_P (type)) |
2bc77e10 | 7132 | { |
7133 | if (! wins && integer_zerop (arg0)) | |
b30e3dbc | 7134 | return negate_expr (fold_convert (type, arg1)); |
2bc77e10 | 7135 | if (integer_zerop (arg1)) |
b30e3dbc | 7136 | return non_lvalue (fold_convert (type, arg0)); |
e4142c0f | 7137 | |
161c8849 | 7138 | /* Fold A - (A & B) into ~B & A. */ |
7139 | if (!TREE_SIDE_EFFECTS (arg0) | |
7140 | && TREE_CODE (arg1) == BIT_AND_EXPR) | |
7141 | { | |
7142 | if (operand_equal_p (arg0, TREE_OPERAND (arg1, 1), 0)) | |
fd96eeef | 7143 | return fold (build2 (BIT_AND_EXPR, type, |
7144 | fold (build1 (BIT_NOT_EXPR, type, | |
7145 | TREE_OPERAND (arg1, 0))), | |
7146 | arg0)); | |
161c8849 | 7147 | if (operand_equal_p (arg0, TREE_OPERAND (arg1, 0), 0)) |
fd96eeef | 7148 | return fold (build2 (BIT_AND_EXPR, type, |
7149 | fold (build1 (BIT_NOT_EXPR, type, | |
7150 | TREE_OPERAND (arg1, 1))), | |
7151 | arg0)); | |
161c8849 | 7152 | } |
79e45861 | 7153 | |
6439555e | 7154 | /* Fold (A & ~B) - (A & B) into (A ^ B) - B, where B is |
79e45861 | 7155 | any power of 2 minus 1. */ |
7156 | if (TREE_CODE (arg0) == BIT_AND_EXPR | |
7157 | && TREE_CODE (arg1) == BIT_AND_EXPR | |
7158 | && operand_equal_p (TREE_OPERAND (arg0, 0), | |
dcb467b4 | 7159 | TREE_OPERAND (arg1, 0), 0)) |
79e45861 | 7160 | { |
7161 | tree mask0 = TREE_OPERAND (arg0, 1); | |
7162 | tree mask1 = TREE_OPERAND (arg1, 1); | |
7163 | tree tem = fold (build1 (BIT_NOT_EXPR, type, mask0)); | |
7206da1b | 7164 | |
dcb467b4 | 7165 | if (operand_equal_p (tem, mask1, 0)) |
79e45861 | 7166 | { |
fd96eeef | 7167 | tem = fold (build2 (BIT_XOR_EXPR, type, |
7168 | TREE_OPERAND (arg0, 0), mask1)); | |
7169 | return fold (build2 (MINUS_EXPR, type, tem, mask1)); | |
79e45861 | 7170 | } |
7171 | } | |
2bc77e10 | 7172 | } |
8045c7c3 | 7173 | |
920d0fb5 | 7174 | /* See if ARG1 is zero and X - ARG1 reduces to X. */ |
7175 | else if (fold_real_zero_addition_p (TREE_TYPE (arg0), arg1, 1)) | |
b30e3dbc | 7176 | return non_lvalue (fold_convert (type, arg0)); |
920d0fb5 | 7177 | |
7178 | /* (ARG0 - ARG1) is the same as (-ARG1 + ARG0). So check whether | |
7179 | ARG0 is zero and X + ARG0 reduces to X, since that would mean | |
7180 | (-ARG1 + ARG0) reduces to -ARG1. */ | |
7181 | else if (!wins && fold_real_zero_addition_p (TREE_TYPE (arg1), arg0, 0)) | |
b30e3dbc | 7182 | return negate_expr (fold_convert (type, arg1)); |
b2c6bec0 | 7183 | |
cc049fa3 | 7184 | /* Fold &x - &x. This can happen from &x.foo - &x. |
8045c7c3 | 7185 | This is unsafe for certain floats even in non-IEEE formats. |
7186 | In IEEE, it is unsafe because it does wrong for NaNs. | |
7187 | Also note that operand_equal_p is always false if an operand | |
7188 | is volatile. */ | |
7189 | ||
7f3be425 | 7190 | if ((! FLOAT_TYPE_P (type) || flag_unsafe_math_optimizations) |
d3d5ed2a | 7191 | && operand_equal_p (arg0, arg1, 0)) |
b30e3dbc | 7192 | return fold_convert (type, integer_zero_node); |
b2c6bec0 | 7193 | |
2169cab6 | 7194 | /* A - B -> A + (-B) if B is easily negatable. */ |
7195 | if (!wins && negate_expr_p (arg1) | |
94721878 | 7196 | && ((FLOAT_TYPE_P (type) |
7197 | /* Avoid this transformation if B is a positive REAL_CST. */ | |
7198 | && (TREE_CODE (arg1) != REAL_CST | |
7199 | || REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg1)))) | |
2169cab6 | 7200 | || (INTEGRAL_TYPE_P (type) && flag_wrapv && !flag_trapv))) |
fd96eeef | 7201 | return fold (build2 (PLUS_EXPR, type, arg0, negate_expr (arg1))); |
2169cab6 | 7202 | |
dbc64c75 | 7203 | /* Try folding difference of addresses. */ |
7204 | { | |
7205 | HOST_WIDE_INT diff; | |
7206 | ||
eb91f88e | 7207 | if ((TREE_CODE (arg0) == ADDR_EXPR |
7208 | || TREE_CODE (arg1) == ADDR_EXPR) | |
7209 | && ptr_difference_const (arg0, arg1, &diff)) | |
dbc64c75 | 7210 | return build_int_cst_type (type, diff); |
7211 | } | |
dede8dcc | 7212 | |
7213 | /* Try replacing &a[i1] - c * i2 with &a[i1 - i2], if c is step | |
7214 | of the array. Loop optimizer sometimes produce this type of | |
7215 | expressions. */ | |
7216 | if (TREE_CODE (arg0) == ADDR_EXPR | |
7217 | && TREE_CODE (arg1) == MULT_EXPR) | |
7218 | { | |
7219 | tem = try_move_mult_to_index (type, MINUS_EXPR, arg0, arg1); | |
7220 | if (tem) | |
7221 | return fold (tem); | |
7222 | } | |
dbc64c75 | 7223 | |
2169cab6 | 7224 | if (TREE_CODE (arg0) == MULT_EXPR |
7225 | && TREE_CODE (arg1) == MULT_EXPR | |
97c2d44f | 7226 | && (!FLOAT_TYPE_P (type) || flag_unsafe_math_optimizations)) |
2169cab6 | 7227 | { |
7228 | /* (A * C) - (B * C) -> (A-B) * C. */ | |
7229 | if (operand_equal_p (TREE_OPERAND (arg0, 1), | |
7230 | TREE_OPERAND (arg1, 1), 0)) | |
fd96eeef | 7231 | return fold (build2 (MULT_EXPR, type, |
7232 | fold (build2 (MINUS_EXPR, type, | |
7233 | TREE_OPERAND (arg0, 0), | |
7234 | TREE_OPERAND (arg1, 0))), | |
7235 | TREE_OPERAND (arg0, 1))); | |
2169cab6 | 7236 | /* (A * C1) - (A * C2) -> A * (C1-C2). */ |
7237 | if (operand_equal_p (TREE_OPERAND (arg0, 0), | |
7238 | TREE_OPERAND (arg1, 0), 0)) | |
fd96eeef | 7239 | return fold (build2 (MULT_EXPR, type, |
7240 | TREE_OPERAND (arg0, 0), | |
7241 | fold (build2 (MINUS_EXPR, type, | |
7242 | TREE_OPERAND (arg0, 1), | |
7243 | TREE_OPERAND (arg1, 1))))); | |
2169cab6 | 7244 | } |
7245 | ||
2bc77e10 | 7246 | goto associate; |
7247 | ||
7248 | case MULT_EXPR: | |
88b41b10 | 7249 | /* (-A) * (-B) -> A * B */ |
a12ecaaa | 7250 | if (TREE_CODE (arg0) == NEGATE_EXPR && negate_expr_p (arg1)) |
fd96eeef | 7251 | return fold (build2 (MULT_EXPR, type, |
7252 | TREE_OPERAND (arg0, 0), | |
7253 | negate_expr (arg1))); | |
a12ecaaa | 7254 | if (TREE_CODE (arg1) == NEGATE_EXPR && negate_expr_p (arg0)) |
fd96eeef | 7255 | return fold (build2 (MULT_EXPR, type, |
7256 | negate_expr (arg0), | |
7257 | TREE_OPERAND (arg1, 0))); | |
88b41b10 | 7258 | |
780a4395 | 7259 | if (! FLOAT_TYPE_P (type)) |
2bc77e10 | 7260 | { |
7261 | if (integer_zerop (arg1)) | |
7262 | return omit_one_operand (type, arg1, arg0); | |
7263 | if (integer_onep (arg1)) | |
b30e3dbc | 7264 | return non_lvalue (fold_convert (type, arg0)); |
2bc77e10 | 7265 | |
7266 | /* (a * (1 << b)) is (a << b) */ | |
7267 | if (TREE_CODE (arg1) == LSHIFT_EXPR | |
7268 | && integer_onep (TREE_OPERAND (arg1, 0))) | |
fd96eeef | 7269 | return fold (build2 (LSHIFT_EXPR, type, arg0, |
7270 | TREE_OPERAND (arg1, 1))); | |
2bc77e10 | 7271 | if (TREE_CODE (arg0) == LSHIFT_EXPR |
7272 | && integer_onep (TREE_OPERAND (arg0, 0))) | |
fd96eeef | 7273 | return fold (build2 (LSHIFT_EXPR, type, arg1, |
7274 | TREE_OPERAND (arg0, 1))); | |
23ec2d5e | 7275 | |
7276 | if (TREE_CODE (arg1) == INTEGER_CST | |
f2fa1510 | 7277 | && 0 != (tem = extract_muldiv (TREE_OPERAND (t, 0), |
b30e3dbc | 7278 | fold_convert (type, arg1), |
23ec2d5e | 7279 | code, NULL_TREE))) |
b30e3dbc | 7280 | return fold_convert (type, tem); |
23ec2d5e | 7281 | |
2bc77e10 | 7282 | } |
2bc77e10 | 7283 | else |
7284 | { | |
920d0fb5 | 7285 | /* Maybe fold x * 0 to 0. The expressions aren't the same |
7286 | when x is NaN, since x * 0 is also NaN. Nor are they the | |
7287 | same in modes with signed zeros, since multiplying a | |
7288 | negative value by 0 gives -0, not +0. */ | |
7289 | if (!HONOR_NANS (TYPE_MODE (TREE_TYPE (arg0))) | |
7290 | && !HONOR_SIGNED_ZEROS (TYPE_MODE (TREE_TYPE (arg0))) | |
2bc77e10 | 7291 | && real_zerop (arg1)) |
7292 | return omit_one_operand (type, arg1, arg0); | |
0a8176f3 | 7293 | /* In IEEE floating point, x*1 is not equivalent to x for snans. */ |
7294 | if (!HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg0))) | |
7295 | && real_onep (arg1)) | |
b30e3dbc | 7296 | return non_lvalue (fold_convert (type, arg0)); |
19fe5401 | 7297 | |
0a8176f3 | 7298 | /* Transform x * -1.0 into -x. */ |
7299 | if (!HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg0))) | |
19fe5401 | 7300 | && real_minus_onep (arg1)) |
a1ebe36a | 7301 | return fold_convert (type, negate_expr (arg0)); |
19fe5401 | 7302 | |
f45a882c | 7303 | /* Convert (C1/X)*C2 into (C1*C2)/X. */ |
7304 | if (flag_unsafe_math_optimizations | |
7305 | && TREE_CODE (arg0) == RDIV_EXPR | |
7306 | && TREE_CODE (arg1) == REAL_CST | |
7307 | && TREE_CODE (TREE_OPERAND (arg0, 0)) == REAL_CST) | |
7308 | { | |
7309 | tree tem = const_binop (MULT_EXPR, TREE_OPERAND (arg0, 0), | |
7310 | arg1, 0); | |
7311 | if (tem) | |
fd96eeef | 7312 | return fold (build2 (RDIV_EXPR, type, tem, |
7313 | TREE_OPERAND (arg0, 1))); | |
f45a882c | 7314 | } |
7315 | ||
805e22b2 | 7316 | if (flag_unsafe_math_optimizations) |
7317 | { | |
7318 | enum built_in_function fcode0 = builtin_mathfn_code (arg0); | |
7319 | enum built_in_function fcode1 = builtin_mathfn_code (arg1); | |
7320 | ||
3bc5c41b | 7321 | /* Optimizations of root(...)*root(...). */ |
7322 | if (fcode0 == fcode1 && BUILTIN_ROOT_P (fcode0)) | |
805e22b2 | 7323 | { |
3bc5c41b | 7324 | tree rootfn, arg, arglist; |
0e83f63c | 7325 | tree arg00 = TREE_VALUE (TREE_OPERAND (arg0, 1)); |
7326 | tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1)); | |
7327 | ||
7328 | /* Optimize sqrt(x)*sqrt(x) as x. */ | |
3bc5c41b | 7329 | if (BUILTIN_SQRT_P (fcode0) |
7330 | && operand_equal_p (arg00, arg10, 0) | |
0e83f63c | 7331 | && ! HONOR_SNANS (TYPE_MODE (type))) |
7332 | return arg00; | |
7333 | ||
3bc5c41b | 7334 | /* Optimize root(x)*root(y) as root(x*y). */ |
7335 | rootfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0); | |
fd96eeef | 7336 | arg = fold (build2 (MULT_EXPR, type, arg00, arg10)); |
0e83f63c | 7337 | arglist = build_tree_list (NULL_TREE, arg); |
3bc5c41b | 7338 | return build_function_call_expr (rootfn, arglist); |
805e22b2 | 7339 | } |
7340 | ||
8918c507 | 7341 | /* Optimize expN(x)*expN(y) as expN(x+y). */ |
852da3c3 | 7342 | if (fcode0 == fcode1 && BUILTIN_EXPONENT_P (fcode0)) |
805e22b2 | 7343 | { |
7344 | tree expfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0); | |
fd96eeef | 7345 | tree arg = build2 (PLUS_EXPR, type, |
7346 | TREE_VALUE (TREE_OPERAND (arg0, 1)), | |
7347 | TREE_VALUE (TREE_OPERAND (arg1, 1))); | |
0e83f63c | 7348 | tree arglist = build_tree_list (NULL_TREE, fold (arg)); |
7349 | return build_function_call_expr (expfn, arglist); | |
7350 | } | |
7351 | ||
7352 | /* Optimizations of pow(...)*pow(...). */ | |
7353 | if ((fcode0 == BUILT_IN_POW && fcode1 == BUILT_IN_POW) | |
7354 | || (fcode0 == BUILT_IN_POWF && fcode1 == BUILT_IN_POWF) | |
7355 | || (fcode0 == BUILT_IN_POWL && fcode1 == BUILT_IN_POWL)) | |
7356 | { | |
7357 | tree arg00 = TREE_VALUE (TREE_OPERAND (arg0, 1)); | |
7358 | tree arg01 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg0, | |
7359 | 1))); | |
7360 | tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1)); | |
7361 | tree arg11 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg1, | |
7362 | 1))); | |
7363 | ||
7364 | /* Optimize pow(x,y)*pow(z,y) as pow(x*z,y). */ | |
7365 | if (operand_equal_p (arg01, arg11, 0)) | |
7366 | { | |
7367 | tree powfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0); | |
fd96eeef | 7368 | tree arg = build2 (MULT_EXPR, type, arg00, arg10); |
0e83f63c | 7369 | tree arglist = tree_cons (NULL_TREE, fold (arg), |
7370 | build_tree_list (NULL_TREE, | |
7371 | arg01)); | |
7372 | return build_function_call_expr (powfn, arglist); | |
7373 | } | |
7374 | ||
7375 | /* Optimize pow(x,y)*pow(x,z) as pow(x,y+z). */ | |
7376 | if (operand_equal_p (arg00, arg10, 0)) | |
7377 | { | |
7378 | tree powfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0); | |
fd96eeef | 7379 | tree arg = fold (build2 (PLUS_EXPR, type, arg01, arg11)); |
0e83f63c | 7380 | tree arglist = tree_cons (NULL_TREE, arg00, |
7381 | build_tree_list (NULL_TREE, | |
7382 | arg)); | |
7383 | return build_function_call_expr (powfn, arglist); | |
7384 | } | |
805e22b2 | 7385 | } |
a4a686a7 | 7386 | |
7387 | /* Optimize tan(x)*cos(x) as sin(x). */ | |
7388 | if (((fcode0 == BUILT_IN_TAN && fcode1 == BUILT_IN_COS) | |
7389 | || (fcode0 == BUILT_IN_TANF && fcode1 == BUILT_IN_COSF) | |
7390 | || (fcode0 == BUILT_IN_TANL && fcode1 == BUILT_IN_COSL) | |
7391 | || (fcode0 == BUILT_IN_COS && fcode1 == BUILT_IN_TAN) | |
7392 | || (fcode0 == BUILT_IN_COSF && fcode1 == BUILT_IN_TANF) | |
7393 | || (fcode0 == BUILT_IN_COSL && fcode1 == BUILT_IN_TANL)) | |
7394 | && operand_equal_p (TREE_VALUE (TREE_OPERAND (arg0, 1)), | |
7395 | TREE_VALUE (TREE_OPERAND (arg1, 1)), 0)) | |
7396 | { | |
0da0dbfa | 7397 | tree sinfn = mathfn_built_in (type, BUILT_IN_SIN); |
a4a686a7 | 7398 | |
7399 | if (sinfn != NULL_TREE) | |
7400 | return build_function_call_expr (sinfn, | |
7401 | TREE_OPERAND (arg0, 1)); | |
7402 | } | |
8c5cac78 | 7403 | |
7404 | /* Optimize x*pow(x,c) as pow(x,c+1). */ | |
7405 | if (fcode1 == BUILT_IN_POW | |
7406 | || fcode1 == BUILT_IN_POWF | |
7407 | || fcode1 == BUILT_IN_POWL) | |
7408 | { | |
7409 | tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1)); | |
7410 | tree arg11 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg1, | |
7411 | 1))); | |
7412 | if (TREE_CODE (arg11) == REAL_CST | |
7413 | && ! TREE_CONSTANT_OVERFLOW (arg11) | |
7414 | && operand_equal_p (arg0, arg10, 0)) | |
7415 | { | |
7416 | tree powfn = TREE_OPERAND (TREE_OPERAND (arg1, 0), 0); | |
7417 | REAL_VALUE_TYPE c; | |
7418 | tree arg, arglist; | |
7419 | ||
7420 | c = TREE_REAL_CST (arg11); | |
7421 | real_arithmetic (&c, PLUS_EXPR, &c, &dconst1); | |
7422 | arg = build_real (type, c); | |
7423 | arglist = build_tree_list (NULL_TREE, arg); | |
7424 | arglist = tree_cons (NULL_TREE, arg0, arglist); | |
7425 | return build_function_call_expr (powfn, arglist); | |
7426 | } | |
7427 | } | |
7428 | ||
7429 | /* Optimize pow(x,c)*x as pow(x,c+1). */ | |
7430 | if (fcode0 == BUILT_IN_POW | |
7431 | || fcode0 == BUILT_IN_POWF | |
7432 | || fcode0 == BUILT_IN_POWL) | |
7433 | { | |
7434 | tree arg00 = TREE_VALUE (TREE_OPERAND (arg0, 1)); | |
7435 | tree arg01 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg0, | |
7436 | 1))); | |
7437 | if (TREE_CODE (arg01) == REAL_CST | |
7438 | && ! TREE_CONSTANT_OVERFLOW (arg01) | |
7439 | && operand_equal_p (arg1, arg00, 0)) | |
7440 | { | |
7441 | tree powfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0); | |
7442 | REAL_VALUE_TYPE c; | |
7443 | tree arg, arglist; | |
7444 | ||
7445 | c = TREE_REAL_CST (arg01); | |
7446 | real_arithmetic (&c, PLUS_EXPR, &c, &dconst1); | |
7447 | arg = build_real (type, c); | |
7448 | arglist = build_tree_list (NULL_TREE, arg); | |
7449 | arglist = tree_cons (NULL_TREE, arg1, arglist); | |
7450 | return build_function_call_expr (powfn, arglist); | |
7451 | } | |
7452 | } | |
7453 | ||
7454 | /* Optimize x*x as pow(x,2.0), which is expanded as x*x. */ | |
7455 | if (! optimize_size | |
7456 | && operand_equal_p (arg0, arg1, 0)) | |
7457 | { | |
0da0dbfa | 7458 | tree powfn = mathfn_built_in (type, BUILT_IN_POW); |
8c5cac78 | 7459 | |
7460 | if (powfn) | |
7461 | { | |
7462 | tree arg = build_real (type, dconst2); | |
7463 | tree arglist = build_tree_list (NULL_TREE, arg); | |
7464 | arglist = tree_cons (NULL_TREE, arg0, arglist); | |
7465 | return build_function_call_expr (powfn, arglist); | |
7466 | } | |
7467 | } | |
805e22b2 | 7468 | } |
2bc77e10 | 7469 | } |
7470 | goto associate; | |
7471 | ||
7472 | case BIT_IOR_EXPR: | |
7473 | bit_ior: | |
7474 | if (integer_all_onesp (arg1)) | |
7475 | return omit_one_operand (type, arg1, arg0); | |
7476 | if (integer_zerop (arg1)) | |
b30e3dbc | 7477 | return non_lvalue (fold_convert (type, arg0)); |
f3983262 | 7478 | if (operand_equal_p (arg0, arg1, 0)) |
7479 | return non_lvalue (fold_convert (type, arg0)); | |
990bbbfa | 7480 | |
7481 | /* ~X | X is -1. */ | |
7482 | if (TREE_CODE (arg0) == BIT_NOT_EXPR | |
7483 | && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0)) | |
7484 | { | |
7016c612 | 7485 | t1 = build_int_cst (type, -1); |
4d28c5d1 | 7486 | t1 = force_fit_type (t1, 0, false, false); |
990bbbfa | 7487 | return omit_one_operand (type, t1, arg1); |
7488 | } | |
7489 | ||
7490 | /* X | ~X is -1. */ | |
7491 | if (TREE_CODE (arg1) == BIT_NOT_EXPR | |
7492 | && operand_equal_p (arg0, TREE_OPERAND (arg1, 0), 0)) | |
7493 | { | |
7016c612 | 7494 | t1 = build_int_cst (type, -1); |
4d28c5d1 | 7495 | t1 = force_fit_type (t1, 0, false, false); |
990bbbfa | 7496 | return omit_one_operand (type, t1, arg0); |
7497 | } | |
7498 | ||
2bc77e10 | 7499 | t1 = distribute_bit_expr (code, type, arg0, arg1); |
7500 | if (t1 != NULL_TREE) | |
7501 | return t1; | |
3bba0206 | 7502 | |
71c3029a | 7503 | /* Convert (or (not arg0) (not arg1)) to (not (and (arg0) (arg1))). |
7504 | ||
cc049fa3 | 7505 | This results in more efficient code for machines without a NAND |
71c3029a | 7506 | instruction. Combine will canonicalize to the first form |
7507 | which will allow use of NAND instructions provided by the | |
7508 | backend if they exist. */ | |
7509 | if (TREE_CODE (arg0) == BIT_NOT_EXPR | |
7510 | && TREE_CODE (arg1) == BIT_NOT_EXPR) | |
7511 | { | |
7512 | return fold (build1 (BIT_NOT_EXPR, type, | |
fd96eeef | 7513 | build2 (BIT_AND_EXPR, type, |
7514 | TREE_OPERAND (arg0, 0), | |
7515 | TREE_OPERAND (arg1, 0)))); | |
71c3029a | 7516 | } |
7517 | ||
0e1e143e | 7518 | /* See if this can be simplified into a rotate first. If that |
7519 | is unsuccessful continue in the association code. */ | |
7520 | goto bit_rotate; | |
2bc77e10 | 7521 | |
7522 | case BIT_XOR_EXPR: | |
7523 | if (integer_zerop (arg1)) | |
b30e3dbc | 7524 | return non_lvalue (fold_convert (type, arg0)); |
2bc77e10 | 7525 | if (integer_all_onesp (arg1)) |
7526 | return fold (build1 (BIT_NOT_EXPR, type, arg0)); | |
f3983262 | 7527 | if (operand_equal_p (arg0, arg1, 0)) |
7528 | return omit_one_operand (type, integer_zero_node, arg0); | |
0e1e143e | 7529 | |
990bbbfa | 7530 | /* ~X ^ X is -1. */ |
7531 | if (TREE_CODE (arg0) == BIT_NOT_EXPR | |
7532 | && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0)) | |
7533 | { | |
7016c612 | 7534 | t1 = build_int_cst (type, -1); |
4d28c5d1 | 7535 | t1 = force_fit_type (t1, 0, false, false); |
990bbbfa | 7536 | return omit_one_operand (type, t1, arg1); |
7537 | } | |
7538 | ||
7539 | /* X ^ ~X is -1. */ | |
7540 | if (TREE_CODE (arg1) == BIT_NOT_EXPR | |
7541 | && operand_equal_p (arg0, TREE_OPERAND (arg1, 0), 0)) | |
7542 | { | |
7016c612 | 7543 | t1 = build_int_cst (type, -1); |
4d28c5d1 | 7544 | t1 = force_fit_type (t1, 0, false, false); |
990bbbfa | 7545 | return omit_one_operand (type, t1, arg0); |
7546 | } | |
7547 | ||
0e1e143e | 7548 | /* If we are XORing two BIT_AND_EXPR's, both of which are and'ing |
7549 | with a constant, and the two constants have no bits in common, | |
7550 | we should treat this as a BIT_IOR_EXPR since this may produce more | |
7551 | simplifications. */ | |
7552 | if (TREE_CODE (arg0) == BIT_AND_EXPR | |
7553 | && TREE_CODE (arg1) == BIT_AND_EXPR | |
7554 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST | |
7555 | && TREE_CODE (TREE_OPERAND (arg1, 1)) == INTEGER_CST | |
7556 | && integer_zerop (const_binop (BIT_AND_EXPR, | |
7557 | TREE_OPERAND (arg0, 1), | |
7558 | TREE_OPERAND (arg1, 1), 0))) | |
cc049fa3 | 7559 | { |
7560 | code = BIT_IOR_EXPR; | |
7561 | goto bit_ior; | |
7562 | } | |
0e1e143e | 7563 | |
6d94dc5c | 7564 | /* See if this can be simplified into a rotate first. If that |
0e1e143e | 7565 | is unsuccessful continue in the association code. */ |
6d94dc5c | 7566 | goto bit_rotate; |
2bc77e10 | 7567 | |
7568 | case BIT_AND_EXPR: | |
2bc77e10 | 7569 | if (integer_all_onesp (arg1)) |
b30e3dbc | 7570 | return non_lvalue (fold_convert (type, arg0)); |
2bc77e10 | 7571 | if (integer_zerop (arg1)) |
7572 | return omit_one_operand (type, arg1, arg0); | |
f3983262 | 7573 | if (operand_equal_p (arg0, arg1, 0)) |
7574 | return non_lvalue (fold_convert (type, arg0)); | |
990bbbfa | 7575 | |
7576 | /* ~X & X is always zero. */ | |
7577 | if (TREE_CODE (arg0) == BIT_NOT_EXPR | |
7578 | && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0)) | |
7579 | return omit_one_operand (type, integer_zero_node, arg1); | |
7580 | ||
7581 | /* X & ~X is always zero. */ | |
7582 | if (TREE_CODE (arg1) == BIT_NOT_EXPR | |
7583 | && operand_equal_p (arg0, TREE_OPERAND (arg1, 0), 0)) | |
7584 | return omit_one_operand (type, integer_zero_node, arg0); | |
7585 | ||
2bc77e10 | 7586 | t1 = distribute_bit_expr (code, type, arg0, arg1); |
7587 | if (t1 != NULL_TREE) | |
7588 | return t1; | |
959abd38 | 7589 | /* Simplify ((int)c & 0377) into (int)c, if c is unsigned char. */ |
2bc77e10 | 7590 | if (TREE_CODE (arg1) == INTEGER_CST && TREE_CODE (arg0) == NOP_EXPR |
78a8ed03 | 7591 | && TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (arg0, 0)))) |
2bc77e10 | 7592 | { |
02e7a332 | 7593 | unsigned int prec |
7594 | = TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (arg0, 0))); | |
7595 | ||
b572011e | 7596 | if (prec < BITS_PER_WORD && prec < HOST_BITS_PER_WIDE_INT |
7597 | && (~TREE_INT_CST_LOW (arg1) | |
7598 | & (((HOST_WIDE_INT) 1 << prec) - 1)) == 0) | |
b30e3dbc | 7599 | return fold_convert (type, TREE_OPERAND (arg0, 0)); |
2bc77e10 | 7600 | } |
71c3029a | 7601 | |
965506c6 | 7602 | /* Convert (and (not arg0) (not arg1)) to (not (or (arg0) (arg1))). |
71c3029a | 7603 | |
cc049fa3 | 7604 | This results in more efficient code for machines without a NOR |
71c3029a | 7605 | instruction. Combine will canonicalize to the first form |
7606 | which will allow use of NOR instructions provided by the | |
7607 | backend if they exist. */ | |
7608 | if (TREE_CODE (arg0) == BIT_NOT_EXPR | |
7609 | && TREE_CODE (arg1) == BIT_NOT_EXPR) | |
7610 | { | |
7611 | return fold (build1 (BIT_NOT_EXPR, type, | |
fd96eeef | 7612 | build2 (BIT_IOR_EXPR, type, |
7613 | TREE_OPERAND (arg0, 0), | |
7614 | TREE_OPERAND (arg1, 0)))); | |
71c3029a | 7615 | } |
7616 | ||
2bc77e10 | 7617 | goto associate; |
7618 | ||
0f586b9b | 7619 | case RDIV_EXPR: |
badfe841 | 7620 | /* Don't touch a floating-point divide by zero unless the mode |
7621 | of the constant can represent infinity. */ | |
7622 | if (TREE_CODE (arg1) == REAL_CST | |
7623 | && !MODE_HAS_INFINITIES (TYPE_MODE (TREE_TYPE (arg1))) | |
7624 | && real_zerop (arg1)) | |
0f586b9b | 7625 | return t; |
0f586b9b | 7626 | |
88b41b10 | 7627 | /* (-A) / (-B) -> A / B */ |
a12ecaaa | 7628 | if (TREE_CODE (arg0) == NEGATE_EXPR && negate_expr_p (arg1)) |
fd96eeef | 7629 | return fold (build2 (RDIV_EXPR, type, |
7630 | TREE_OPERAND (arg0, 0), | |
7631 | negate_expr (arg1))); | |
a12ecaaa | 7632 | if (TREE_CODE (arg1) == NEGATE_EXPR && negate_expr_p (arg0)) |
fd96eeef | 7633 | return fold (build2 (RDIV_EXPR, type, |
7634 | negate_expr (arg0), | |
7635 | TREE_OPERAND (arg1, 0))); | |
88b41b10 | 7636 | |
0a8176f3 | 7637 | /* In IEEE floating point, x/1 is not equivalent to x for snans. */ |
7638 | if (!HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg0))) | |
7639 | && real_onep (arg1)) | |
b30e3dbc | 7640 | return non_lvalue (fold_convert (type, arg0)); |
0f586b9b | 7641 | |
a12ecaaa | 7642 | /* In IEEE floating point, x/-1 is not equivalent to -x for snans. */ |
7643 | if (!HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg0))) | |
7644 | && real_minus_onep (arg1)) | |
b30e3dbc | 7645 | return non_lvalue (fold_convert (type, negate_expr (arg0))); |
a12ecaaa | 7646 | |
0f586b9b | 7647 | /* If ARG1 is a constant, we can convert this to a multiply by the |
7648 | reciprocal. This does not have the same rounding properties, | |
7f3be425 | 7649 | so only do this if -funsafe-math-optimizations. We can actually |
7650 | always safely do it if ARG1 is a power of two, but it's hard to | |
7651 | tell if it is or not in a portable manner. */ | |
88181ec5 | 7652 | if (TREE_CODE (arg1) == REAL_CST) |
7653 | { | |
7f3be425 | 7654 | if (flag_unsafe_math_optimizations |
88181ec5 | 7655 | && 0 != (tem = const_binop (code, build_real (type, dconst1), |
7656 | arg1, 0))) | |
fd96eeef | 7657 | return fold (build2 (MULT_EXPR, type, arg0, tem)); |
6312a35e | 7658 | /* Find the reciprocal if optimizing and the result is exact. */ |
f45a882c | 7659 | if (optimize) |
88181ec5 | 7660 | { |
7661 | REAL_VALUE_TYPE r; | |
7662 | r = TREE_REAL_CST (arg1); | |
7663 | if (exact_real_inverse (TYPE_MODE(TREE_TYPE(arg0)), &r)) | |
cc049fa3 | 7664 | { |
7665 | tem = build_real (type, r); | |
fd96eeef | 7666 | return fold (build2 (MULT_EXPR, type, arg0, tem)); |
cc049fa3 | 7667 | } |
88181ec5 | 7668 | } |
7669 | } | |
d82dc0a7 | 7670 | /* Convert A/B/C to A/(B*C). */ |
7671 | if (flag_unsafe_math_optimizations | |
7672 | && TREE_CODE (arg0) == RDIV_EXPR) | |
fd96eeef | 7673 | return fold (build2 (RDIV_EXPR, type, TREE_OPERAND (arg0, 0), |
7674 | fold (build2 (MULT_EXPR, type, | |
7675 | TREE_OPERAND (arg0, 1), arg1)))); | |
f45a882c | 7676 | |
d82dc0a7 | 7677 | /* Convert A/(B/C) to (A/B)*C. */ |
7678 | if (flag_unsafe_math_optimizations | |
7679 | && TREE_CODE (arg1) == RDIV_EXPR) | |
fd96eeef | 7680 | return fold (build2 (MULT_EXPR, type, |
7681 | fold (build2 (RDIV_EXPR, type, arg0, | |
7682 | TREE_OPERAND (arg1, 0))), | |
7683 | TREE_OPERAND (arg1, 1))); | |
f45a882c | 7684 | |
7685 | /* Convert C1/(X*C2) into (C1/C2)/X. */ | |
7686 | if (flag_unsafe_math_optimizations | |
7687 | && TREE_CODE (arg1) == MULT_EXPR | |
7688 | && TREE_CODE (arg0) == REAL_CST | |
7689 | && TREE_CODE (TREE_OPERAND (arg1, 1)) == REAL_CST) | |
d82dc0a7 | 7690 | { |
f45a882c | 7691 | tree tem = const_binop (RDIV_EXPR, arg0, |
7692 | TREE_OPERAND (arg1, 1), 0); | |
7693 | if (tem) | |
fd96eeef | 7694 | return fold (build2 (RDIV_EXPR, type, tem, |
7695 | TREE_OPERAND (arg1, 0))); | |
d82dc0a7 | 7696 | } |
805e22b2 | 7697 | |
805e22b2 | 7698 | if (flag_unsafe_math_optimizations) |
7699 | { | |
7700 | enum built_in_function fcode = builtin_mathfn_code (arg1); | |
8918c507 | 7701 | /* Optimize x/expN(y) into x*expN(-y). */ |
852da3c3 | 7702 | if (BUILTIN_EXPONENT_P (fcode)) |
805e22b2 | 7703 | { |
7704 | tree expfn = TREE_OPERAND (TREE_OPERAND (arg1, 0), 0); | |
a1ebe36a | 7705 | tree arg = negate_expr (TREE_VALUE (TREE_OPERAND (arg1, 1))); |
7706 | tree arglist = build_tree_list (NULL_TREE, | |
7707 | fold_convert (type, arg)); | |
805e22b2 | 7708 | arg1 = build_function_call_expr (expfn, arglist); |
fd96eeef | 7709 | return fold (build2 (MULT_EXPR, type, arg0, arg1)); |
805e22b2 | 7710 | } |
0e83f63c | 7711 | |
7712 | /* Optimize x/pow(y,z) into x*pow(y,-z). */ | |
7713 | if (fcode == BUILT_IN_POW | |
7714 | || fcode == BUILT_IN_POWF | |
7715 | || fcode == BUILT_IN_POWL) | |
7716 | { | |
7717 | tree powfn = TREE_OPERAND (TREE_OPERAND (arg1, 0), 0); | |
7718 | tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1)); | |
7719 | tree arg11 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg1, 1))); | |
a1ebe36a | 7720 | tree neg11 = fold_convert (type, negate_expr (arg11)); |
0e83f63c | 7721 | tree arglist = tree_cons(NULL_TREE, arg10, |
7722 | build_tree_list (NULL_TREE, neg11)); | |
7723 | arg1 = build_function_call_expr (powfn, arglist); | |
fd96eeef | 7724 | return fold (build2 (MULT_EXPR, type, arg0, arg1)); |
0e83f63c | 7725 | } |
805e22b2 | 7726 | } |
a4a686a7 | 7727 | |
7728 | if (flag_unsafe_math_optimizations) | |
7729 | { | |
7730 | enum built_in_function fcode0 = builtin_mathfn_code (arg0); | |
7731 | enum built_in_function fcode1 = builtin_mathfn_code (arg1); | |
7732 | ||
7733 | /* Optimize sin(x)/cos(x) as tan(x). */ | |
7734 | if (((fcode0 == BUILT_IN_SIN && fcode1 == BUILT_IN_COS) | |
7735 | || (fcode0 == BUILT_IN_SINF && fcode1 == BUILT_IN_COSF) | |
7736 | || (fcode0 == BUILT_IN_SINL && fcode1 == BUILT_IN_COSL)) | |
7737 | && operand_equal_p (TREE_VALUE (TREE_OPERAND (arg0, 1)), | |
7738 | TREE_VALUE (TREE_OPERAND (arg1, 1)), 0)) | |
7739 | { | |
0da0dbfa | 7740 | tree tanfn = mathfn_built_in (type, BUILT_IN_TAN); |
a4a686a7 | 7741 | |
7742 | if (tanfn != NULL_TREE) | |
7743 | return build_function_call_expr (tanfn, | |
7744 | TREE_OPERAND (arg0, 1)); | |
7745 | } | |
7746 | ||
7747 | /* Optimize cos(x)/sin(x) as 1.0/tan(x). */ | |
7748 | if (((fcode0 == BUILT_IN_COS && fcode1 == BUILT_IN_SIN) | |
7749 | || (fcode0 == BUILT_IN_COSF && fcode1 == BUILT_IN_SINF) | |
7750 | || (fcode0 == BUILT_IN_COSL && fcode1 == BUILT_IN_SINL)) | |
7751 | && operand_equal_p (TREE_VALUE (TREE_OPERAND (arg0, 1)), | |
7752 | TREE_VALUE (TREE_OPERAND (arg1, 1)), 0)) | |
7753 | { | |
0da0dbfa | 7754 | tree tanfn = mathfn_built_in (type, BUILT_IN_TAN); |
a4a686a7 | 7755 | |
7756 | if (tanfn != NULL_TREE) | |
7757 | { | |
7758 | tree tmp = TREE_OPERAND (arg0, 1); | |
7759 | tmp = build_function_call_expr (tanfn, tmp); | |
fd96eeef | 7760 | return fold (build2 (RDIV_EXPR, type, |
7761 | build_real (type, dconst1), tmp)); | |
a4a686a7 | 7762 | } |
7763 | } | |
8c5cac78 | 7764 | |
7765 | /* Optimize pow(x,c)/x as pow(x,c-1). */ | |
7766 | if (fcode0 == BUILT_IN_POW | |
7767 | || fcode0 == BUILT_IN_POWF | |
7768 | || fcode0 == BUILT_IN_POWL) | |
7769 | { | |
7770 | tree arg00 = TREE_VALUE (TREE_OPERAND (arg0, 1)); | |
7771 | tree arg01 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg0, 1))); | |
7772 | if (TREE_CODE (arg01) == REAL_CST | |
7773 | && ! TREE_CONSTANT_OVERFLOW (arg01) | |
7774 | && operand_equal_p (arg1, arg00, 0)) | |
7775 | { | |
7776 | tree powfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0); | |
7777 | REAL_VALUE_TYPE c; | |
7778 | tree arg, arglist; | |
7779 | ||
7780 | c = TREE_REAL_CST (arg01); | |
7781 | real_arithmetic (&c, MINUS_EXPR, &c, &dconst1); | |
7782 | arg = build_real (type, c); | |
7783 | arglist = build_tree_list (NULL_TREE, arg); | |
7784 | arglist = tree_cons (NULL_TREE, arg1, arglist); | |
7785 | return build_function_call_expr (powfn, arglist); | |
7786 | } | |
7787 | } | |
a4a686a7 | 7788 | } |
0f586b9b | 7789 | goto binary; |
7790 | ||
2bc77e10 | 7791 | case TRUNC_DIV_EXPR: |
7792 | case ROUND_DIV_EXPR: | |
7793 | case FLOOR_DIV_EXPR: | |
7794 | case CEIL_DIV_EXPR: | |
7795 | case EXACT_DIV_EXPR: | |
2bc77e10 | 7796 | if (integer_onep (arg1)) |
b30e3dbc | 7797 | return non_lvalue (fold_convert (type, arg0)); |
2bc77e10 | 7798 | if (integer_zerop (arg1)) |
7799 | return t; | |
a1ebe36a | 7800 | /* X / -1 is -X. */ |
7801 | if (!TYPE_UNSIGNED (type) | |
7802 | && TREE_CODE (arg1) == INTEGER_CST | |
7803 | && TREE_INT_CST_LOW (arg1) == (unsigned HOST_WIDE_INT) -1 | |
7804 | && TREE_INT_CST_HIGH (arg1) == -1) | |
7805 | return fold_convert (type, negate_expr (arg0)); | |
39635df9 | 7806 | |
76a0ced5 | 7807 | /* If arg0 is a multiple of arg1, then rewrite to the fastest div |
7808 | operation, EXACT_DIV_EXPR. | |
7809 | ||
a433cd39 | 7810 | Note that only CEIL_DIV_EXPR and FLOOR_DIV_EXPR are rewritten now. |
7811 | At one time others generated faster code, it's not clear if they do | |
7812 | after the last round to changes to the DIV code in expmed.c. */ | |
7813 | if ((code == CEIL_DIV_EXPR || code == FLOOR_DIV_EXPR) | |
76a0ced5 | 7814 | && multiple_of_p (type, arg0, arg1)) |
fd96eeef | 7815 | return fold (build2 (EXACT_DIV_EXPR, type, arg0, arg1)); |
76a0ced5 | 7816 | |
cc049fa3 | 7817 | if (TREE_CODE (arg1) == INTEGER_CST |
23ec2d5e | 7818 | && 0 != (tem = extract_muldiv (TREE_OPERAND (t, 0), arg1, |
7819 | code, NULL_TREE))) | |
b30e3dbc | 7820 | return fold_convert (type, tem); |
39635df9 | 7821 | |
2bc77e10 | 7822 | goto binary; |
7823 | ||
7824 | case CEIL_MOD_EXPR: | |
7825 | case FLOOR_MOD_EXPR: | |
7826 | case ROUND_MOD_EXPR: | |
7827 | case TRUNC_MOD_EXPR: | |
7828 | if (integer_onep (arg1)) | |
7829 | return omit_one_operand (type, integer_zero_node, arg0); | |
7830 | if (integer_zerop (arg1)) | |
7831 | return t; | |
662f41e4 | 7832 | |
a1ebe36a | 7833 | /* X % -1 is zero. */ |
7834 | if (!TYPE_UNSIGNED (type) | |
7835 | && TREE_CODE (arg1) == INTEGER_CST | |
7836 | && TREE_INT_CST_LOW (arg1) == (unsigned HOST_WIDE_INT) -1 | |
7837 | && TREE_INT_CST_HIGH (arg1) == -1) | |
7838 | return omit_one_operand (type, integer_zero_node, arg0); | |
e4142c0f | 7839 | |
662f41e4 | 7840 | /* Optimize unsigned TRUNC_MOD_EXPR by a power of two into a |
7841 | BIT_AND_EXPR, i.e. "X % C" into "X & C2". */ | |
7842 | if (code == TRUNC_MOD_EXPR | |
7843 | && TYPE_UNSIGNED (type) | |
7844 | && integer_pow2p (arg1)) | |
7845 | { | |
7846 | unsigned HOST_WIDE_INT high, low; | |
7847 | tree mask; | |
7848 | int l; | |
7849 | ||
7850 | l = tree_log2 (arg1); | |
7851 | if (l >= HOST_BITS_PER_WIDE_INT) | |
7852 | { | |
7853 | high = ((unsigned HOST_WIDE_INT) 1 | |
7854 | << (l - HOST_BITS_PER_WIDE_INT)) - 1; | |
7855 | low = -1; | |
7856 | } | |
7857 | else | |
7858 | { | |
7859 | high = 0; | |
7860 | low = ((unsigned HOST_WIDE_INT) 1 << l) - 1; | |
7861 | } | |
7862 | ||
7016c612 | 7863 | mask = build_int_cst_wide (type, low, high); |
662f41e4 | 7864 | return fold (build2 (BIT_AND_EXPR, type, |
7865 | fold_convert (type, arg0), mask)); | |
7866 | } | |
7867 | ||
2729135a | 7868 | /* X % -C is the same as X % C. */ |
7869 | if (code == TRUNC_MOD_EXPR | |
7870 | && !TYPE_UNSIGNED (type) | |
662f41e4 | 7871 | && TREE_CODE (arg1) == INTEGER_CST |
7872 | && TREE_INT_CST_HIGH (arg1) < 0 | |
7873 | && !flag_trapv | |
7874 | /* Avoid this transformation if C is INT_MIN, i.e. C == -C. */ | |
7875 | && !sign_bit_p (arg1, arg1)) | |
7876 | return fold (build2 (code, type, fold_convert (type, arg0), | |
7877 | fold_convert (type, negate_expr (arg1)))); | |
7878 | ||
2729135a | 7879 | /* X % -Y is the same as X % Y. */ |
7880 | if (code == TRUNC_MOD_EXPR | |
7881 | && !TYPE_UNSIGNED (type) | |
662f41e4 | 7882 | && TREE_CODE (arg1) == NEGATE_EXPR |
7883 | && !flag_trapv) | |
7884 | return fold (build2 (code, type, fold_convert (type, arg0), | |
7885 | fold_convert (type, TREE_OPERAND (arg1, 0)))); | |
7886 | ||
e4142c0f | 7887 | if (TREE_CODE (arg1) == INTEGER_CST |
23ec2d5e | 7888 | && 0 != (tem = extract_muldiv (TREE_OPERAND (t, 0), arg1, |
7889 | code, NULL_TREE))) | |
b30e3dbc | 7890 | return fold_convert (type, tem); |
e4142c0f | 7891 | |
2bc77e10 | 7892 | goto binary; |
7893 | ||
2bc77e10 | 7894 | case LROTATE_EXPR: |
7895 | case RROTATE_EXPR: | |
805e22b2 | 7896 | if (integer_all_onesp (arg0)) |
7897 | return omit_one_operand (type, arg0, arg1); | |
7898 | goto shift; | |
7899 | ||
7900 | case RSHIFT_EXPR: | |
7901 | /* Optimize -1 >> x for arithmetic right shifts. */ | |
78a8ed03 | 7902 | if (integer_all_onesp (arg0) && !TYPE_UNSIGNED (type)) |
805e22b2 | 7903 | return omit_one_operand (type, arg0, arg1); |
7904 | /* ... fall through ... */ | |
7905 | ||
7906 | case LSHIFT_EXPR: | |
7907 | shift: | |
2bc77e10 | 7908 | if (integer_zerop (arg1)) |
b30e3dbc | 7909 | return non_lvalue (fold_convert (type, arg0)); |
805e22b2 | 7910 | if (integer_zerop (arg0)) |
7911 | return omit_one_operand (type, arg0, arg1); | |
7912 | ||
2bc77e10 | 7913 | /* Since negative shift count is not well-defined, |
7914 | don't try to compute it in the compiler. */ | |
7a1b56a9 | 7915 | if (TREE_CODE (arg1) == INTEGER_CST && tree_int_cst_sgn (arg1) < 0) |
2bc77e10 | 7916 | return t; |
7a1b56a9 | 7917 | /* Rewrite an LROTATE_EXPR by a constant into an |
7918 | RROTATE_EXPR by a new constant. */ | |
7919 | if (code == LROTATE_EXPR && TREE_CODE (arg1) == INTEGER_CST) | |
7920 | { | |
7c446c95 | 7921 | tree tem = build_int_cst (NULL_TREE, |
7016c612 | 7922 | GET_MODE_BITSIZE (TYPE_MODE (type))); |
b30e3dbc | 7923 | tem = fold_convert (TREE_TYPE (arg1), tem); |
88e11d8f | 7924 | tem = const_binop (MINUS_EXPR, tem, arg1, 0); |
fd96eeef | 7925 | return fold (build2 (RROTATE_EXPR, type, arg0, tem)); |
7a1b56a9 | 7926 | } |
7927 | ||
7928 | /* If we have a rotate of a bit operation with the rotate count and | |
7929 | the second operand of the bit operation both constant, | |
7930 | permute the two operations. */ | |
7931 | if (code == RROTATE_EXPR && TREE_CODE (arg1) == INTEGER_CST | |
7932 | && (TREE_CODE (arg0) == BIT_AND_EXPR | |
7a1b56a9 | 7933 | || TREE_CODE (arg0) == BIT_IOR_EXPR |
7934 | || TREE_CODE (arg0) == BIT_XOR_EXPR) | |
7935 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST) | |
fd96eeef | 7936 | return fold (build2 (TREE_CODE (arg0), type, |
7937 | fold (build2 (code, type, | |
7938 | TREE_OPERAND (arg0, 0), arg1)), | |
7939 | fold (build2 (code, type, | |
7940 | TREE_OPERAND (arg0, 1), arg1)))); | |
7a1b56a9 | 7941 | |
7942 | /* Two consecutive rotates adding up to the width of the mode can | |
7943 | be ignored. */ | |
7944 | if (code == RROTATE_EXPR && TREE_CODE (arg1) == INTEGER_CST | |
7945 | && TREE_CODE (arg0) == RROTATE_EXPR | |
7946 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST | |
7947 | && TREE_INT_CST_HIGH (arg1) == 0 | |
7948 | && TREE_INT_CST_HIGH (TREE_OPERAND (arg0, 1)) == 0 | |
7949 | && ((TREE_INT_CST_LOW (arg1) | |
7950 | + TREE_INT_CST_LOW (TREE_OPERAND (arg0, 1))) | |
a0c2c45b | 7951 | == (unsigned int) GET_MODE_BITSIZE (TYPE_MODE (type)))) |
7a1b56a9 | 7952 | return TREE_OPERAND (arg0, 0); |
7953 | ||
2bc77e10 | 7954 | goto binary; |
7955 | ||
7956 | case MIN_EXPR: | |
7957 | if (operand_equal_p (arg0, arg1, 0)) | |
3a6656ad | 7958 | return omit_one_operand (type, arg0, arg1); |
780a4395 | 7959 | if (INTEGRAL_TYPE_P (type) |
4ee9c684 | 7960 | && operand_equal_p (arg1, TYPE_MIN_VALUE (type), OEP_ONLY_CONST)) |
2bc77e10 | 7961 | return omit_one_operand (type, arg1, arg0); |
7962 | goto associate; | |
7963 | ||
7964 | case MAX_EXPR: | |
7965 | if (operand_equal_p (arg0, arg1, 0)) | |
3a6656ad | 7966 | return omit_one_operand (type, arg0, arg1); |
780a4395 | 7967 | if (INTEGRAL_TYPE_P (type) |
f52483b5 | 7968 | && TYPE_MAX_VALUE (type) |
4ee9c684 | 7969 | && operand_equal_p (arg1, TYPE_MAX_VALUE (type), OEP_ONLY_CONST)) |
2bc77e10 | 7970 | return omit_one_operand (type, arg1, arg0); |
7971 | goto associate; | |
7972 | ||
7973 | case TRUTH_NOT_EXPR: | |
2dcc623a | 7974 | /* The argument to invert_truthvalue must have Boolean type. */ |
7975 | if (TREE_CODE (TREE_TYPE (arg0)) != BOOLEAN_TYPE) | |
7976 | arg0 = fold_convert (boolean_type_node, arg0); | |
7206da1b | 7977 | |
2bc77e10 | 7978 | /* Note that the operand of this must be an int |
7979 | and its values must be 0 or 1. | |
7980 | ("true" is a fixed value perhaps depending on the language, | |
7981 | but we don't handle values other than 1 correctly yet.) */ | |
7bbc42b5 | 7982 | tem = invert_truthvalue (arg0); |
7983 | /* Avoid infinite recursion. */ | |
7984 | if (TREE_CODE (tem) == TRUTH_NOT_EXPR) | |
6881f973 | 7985 | { |
7986 | tem = fold_single_bit_test (code, arg0, arg1, type); | |
7987 | if (tem) | |
7988 | return tem; | |
7989 | return t; | |
7990 | } | |
b30e3dbc | 7991 | return fold_convert (type, tem); |
2bc77e10 | 7992 | |
7993 | case TRUTH_ANDIF_EXPR: | |
7994 | /* Note that the operands of this must be ints | |
7995 | and their values must be 0 or 1. | |
7996 | ("true" is a fixed value perhaps depending on the language.) */ | |
7997 | /* If first arg is constant zero, return it. */ | |
9a7b73a1 | 7998 | if (integer_zerop (arg0)) |
b30e3dbc | 7999 | return fold_convert (type, arg0); |
2bc77e10 | 8000 | case TRUTH_AND_EXPR: |
8001 | /* If either arg is constant true, drop it. */ | |
8002 | if (TREE_CODE (arg0) == INTEGER_CST && ! integer_zerop (arg0)) | |
b30e3dbc | 8003 | return non_lvalue (fold_convert (type, arg1)); |
4e91a871 | 8004 | if (TREE_CODE (arg1) == INTEGER_CST && ! integer_zerop (arg1) |
8005 | /* Preserve sequence points. */ | |
8006 | && (code != TRUTH_ANDIF_EXPR || ! TREE_SIDE_EFFECTS (arg0))) | |
b30e3dbc | 8007 | return non_lvalue (fold_convert (type, arg0)); |
9a7b73a1 | 8008 | /* If second arg is constant zero, result is zero, but first arg |
8009 | must be evaluated. */ | |
8010 | if (integer_zerop (arg1)) | |
8011 | return omit_one_operand (type, arg1, arg0); | |
f83854c8 | 8012 | /* Likewise for first arg, but note that only the TRUTH_AND_EXPR |
8013 | case will be handled here. */ | |
8014 | if (integer_zerop (arg0)) | |
8015 | return omit_one_operand (type, arg0, arg1); | |
2bc77e10 | 8016 | |
990bbbfa | 8017 | /* !X && X is always false. */ |
8018 | if (TREE_CODE (arg0) == TRUTH_NOT_EXPR | |
8019 | && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0)) | |
8020 | return omit_one_operand (type, integer_zero_node, arg1); | |
8021 | /* X && !X is always false. */ | |
8022 | if (TREE_CODE (arg1) == TRUTH_NOT_EXPR | |
8023 | && operand_equal_p (arg0, TREE_OPERAND (arg1, 0), 0)) | |
8024 | return omit_one_operand (type, integer_zero_node, arg0); | |
8025 | ||
2bc77e10 | 8026 | truth_andor: |
935abd69 | 8027 | /* We only do these simplifications if we are optimizing. */ |
8028 | if (!optimize) | |
8029 | return t; | |
8030 | ||
8031 | /* Check for things like (A || B) && (A || C). We can convert this | |
8032 | to A || (B && C). Note that either operator can be any of the four | |
8033 | truth and/or operations and the transformation will still be | |
8034 | valid. Also note that we only care about order for the | |
a8149ca2 | 8035 | ANDIF and ORIF operators. If B contains side effects, this |
6312a35e | 8036 | might change the truth-value of A. */ |
935abd69 | 8037 | if (TREE_CODE (arg0) == TREE_CODE (arg1) |
8038 | && (TREE_CODE (arg0) == TRUTH_ANDIF_EXPR | |
8039 | || TREE_CODE (arg0) == TRUTH_ORIF_EXPR | |
8040 | || TREE_CODE (arg0) == TRUTH_AND_EXPR | |
a8149ca2 | 8041 | || TREE_CODE (arg0) == TRUTH_OR_EXPR) |
8042 | && ! TREE_SIDE_EFFECTS (TREE_OPERAND (arg0, 1))) | |
935abd69 | 8043 | { |
8044 | tree a00 = TREE_OPERAND (arg0, 0); | |
8045 | tree a01 = TREE_OPERAND (arg0, 1); | |
8046 | tree a10 = TREE_OPERAND (arg1, 0); | |
8047 | tree a11 = TREE_OPERAND (arg1, 1); | |
8048 | int commutative = ((TREE_CODE (arg0) == TRUTH_OR_EXPR | |
8049 | || TREE_CODE (arg0) == TRUTH_AND_EXPR) | |
8050 | && (code == TRUTH_AND_EXPR | |
8051 | || code == TRUTH_OR_EXPR)); | |
8052 | ||
8053 | if (operand_equal_p (a00, a10, 0)) | |
fd96eeef | 8054 | return fold (build2 (TREE_CODE (arg0), type, a00, |
8055 | fold (build2 (code, type, a01, a11)))); | |
935abd69 | 8056 | else if (commutative && operand_equal_p (a00, a11, 0)) |
fd96eeef | 8057 | return fold (build2 (TREE_CODE (arg0), type, a00, |
8058 | fold (build2 (code, type, a01, a10)))); | |
935abd69 | 8059 | else if (commutative && operand_equal_p (a01, a10, 0)) |
fd96eeef | 8060 | return fold (build2 (TREE_CODE (arg0), type, a01, |
8061 | fold (build2 (code, type, a00, a11)))); | |
935abd69 | 8062 | |
8063 | /* This case if tricky because we must either have commutative | |
8064 | operators or else A10 must not have side-effects. */ | |
8065 | ||
8066 | else if ((commutative || ! TREE_SIDE_EFFECTS (a10)) | |
8067 | && operand_equal_p (a01, a11, 0)) | |
fd96eeef | 8068 | return fold (build2 (TREE_CODE (arg0), type, |
8069 | fold (build2 (code, type, a00, a10)), | |
8070 | a01)); | |
935abd69 | 8071 | } |
8072 | ||
12ec0a8a | 8073 | /* See if we can build a range comparison. */ |
8074 | if (0 != (tem = fold_range_test (t))) | |
8075 | return tem; | |
8076 | ||
2bc77e10 | 8077 | /* Check for the possibility of merging component references. If our |
8078 | lhs is another similar operation, try to merge its rhs with our | |
8079 | rhs. Then try to merge our lhs and rhs. */ | |
935abd69 | 8080 | if (TREE_CODE (arg0) == code |
8081 | && 0 != (tem = fold_truthop (code, type, | |
8082 | TREE_OPERAND (arg0, 1), arg1))) | |
fd96eeef | 8083 | return fold (build2 (code, type, TREE_OPERAND (arg0, 0), tem)); |
2bc77e10 | 8084 | |
935abd69 | 8085 | if ((tem = fold_truthop (code, type, arg0, arg1)) != 0) |
8086 | return tem; | |
8b94828f | 8087 | |
2bc77e10 | 8088 | return t; |
8089 | ||
8090 | case TRUTH_ORIF_EXPR: | |
8091 | /* Note that the operands of this must be ints | |
8092 | and their values must be 0 or true. | |
8093 | ("true" is a fixed value perhaps depending on the language.) */ | |
8094 | /* If first arg is constant true, return it. */ | |
8095 | if (TREE_CODE (arg0) == INTEGER_CST && ! integer_zerop (arg0)) | |
b30e3dbc | 8096 | return fold_convert (type, arg0); |
2bc77e10 | 8097 | case TRUTH_OR_EXPR: |
8098 | /* If either arg is constant zero, drop it. */ | |
8099 | if (TREE_CODE (arg0) == INTEGER_CST && integer_zerop (arg0)) | |
b30e3dbc | 8100 | return non_lvalue (fold_convert (type, arg1)); |
4e91a871 | 8101 | if (TREE_CODE (arg1) == INTEGER_CST && integer_zerop (arg1) |
8102 | /* Preserve sequence points. */ | |
8103 | && (code != TRUTH_ORIF_EXPR || ! TREE_SIDE_EFFECTS (arg0))) | |
b30e3dbc | 8104 | return non_lvalue (fold_convert (type, arg0)); |
9a7b73a1 | 8105 | /* If second arg is constant true, result is true, but we must |
8106 | evaluate first arg. */ | |
8107 | if (TREE_CODE (arg1) == INTEGER_CST && ! integer_zerop (arg1)) | |
8108 | return omit_one_operand (type, arg1, arg0); | |
f83854c8 | 8109 | /* Likewise for first arg, but note this only occurs here for |
8110 | TRUTH_OR_EXPR. */ | |
8111 | if (TREE_CODE (arg0) == INTEGER_CST && ! integer_zerop (arg0)) | |
8112 | return omit_one_operand (type, arg0, arg1); | |
990bbbfa | 8113 | |
8114 | /* !X || X is always true. */ | |
8115 | if (TREE_CODE (arg0) == TRUTH_NOT_EXPR | |
8116 | && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0)) | |
8117 | return omit_one_operand (type, integer_one_node, arg1); | |
8118 | /* X || !X is always true. */ | |
8119 | if (TREE_CODE (arg1) == TRUTH_NOT_EXPR | |
8120 | && operand_equal_p (arg0, TREE_OPERAND (arg1, 0), 0)) | |
8121 | return omit_one_operand (type, integer_one_node, arg0); | |
8122 | ||
2bc77e10 | 8123 | goto truth_andor; |
8124 | ||
9a7b73a1 | 8125 | case TRUTH_XOR_EXPR: |
990bbbfa | 8126 | /* If the second arg is constant zero, drop it. */ |
9a7b73a1 | 8127 | if (integer_zerop (arg1)) |
b30e3dbc | 8128 | return non_lvalue (fold_convert (type, arg0)); |
990bbbfa | 8129 | /* If the second arg is constant true, this is a logical inversion. */ |
9a7b73a1 | 8130 | if (integer_onep (arg1)) |
b30e3dbc | 8131 | return non_lvalue (fold_convert (type, invert_truthvalue (arg0))); |
4ee9c684 | 8132 | /* Identical arguments cancel to zero. */ |
8133 | if (operand_equal_p (arg0, arg1, 0)) | |
8134 | return omit_one_operand (type, integer_zero_node, arg0); | |
990bbbfa | 8135 | |
8136 | /* !X ^ X is always true. */ | |
8137 | if (TREE_CODE (arg0) == TRUTH_NOT_EXPR | |
8138 | && operand_equal_p (TREE_OPERAND (arg0, 0), arg1, 0)) | |
8139 | return omit_one_operand (type, integer_one_node, arg1); | |
8140 | ||
8141 | /* X ^ !X is always true. */ | |
8142 | if (TREE_CODE (arg1) == TRUTH_NOT_EXPR | |
8143 | && operand_equal_p (arg0, TREE_OPERAND (arg1, 0), 0)) | |
8144 | return omit_one_operand (type, integer_one_node, arg0); | |
8145 | ||
54e99035 | 8146 | return t; |
9a7b73a1 | 8147 | |
2bc77e10 | 8148 | case EQ_EXPR: |
8149 | case NE_EXPR: | |
8150 | case LT_EXPR: | |
8151 | case GT_EXPR: | |
8152 | case LE_EXPR: | |
8153 | case GE_EXPR: | |
f4185d2b | 8154 | /* If one arg is a real or integer constant, put it last. */ |
bd214d13 | 8155 | if (tree_swap_operands_p (arg0, arg1, true)) |
fd96eeef | 8156 | return fold (build2 (swap_tree_comparison (code), type, arg1, arg0)); |
f4185d2b | 8157 | |
4a755ae7 | 8158 | /* If this is an equality comparison of the address of a non-weak |
8159 | object against zero, then we know the result. */ | |
8160 | if ((code == EQ_EXPR || code == NE_EXPR) | |
8161 | && TREE_CODE (arg0) == ADDR_EXPR | |
8162 | && DECL_P (TREE_OPERAND (arg0, 0)) | |
8163 | && ! DECL_WEAK (TREE_OPERAND (arg0, 0)) | |
8164 | && integer_zerop (arg1)) | |
20783f07 | 8165 | return constant_boolean_node (code != EQ_EXPR, type); |
4a755ae7 | 8166 | |
8167 | /* If this is an equality comparison of the address of two non-weak, | |
8168 | unaliased symbols neither of which are extern (since we do not | |
8169 | have access to attributes for externs), then we know the result. */ | |
8170 | if ((code == EQ_EXPR || code == NE_EXPR) | |
8171 | && TREE_CODE (arg0) == ADDR_EXPR | |
8172 | && DECL_P (TREE_OPERAND (arg0, 0)) | |
8173 | && ! DECL_WEAK (TREE_OPERAND (arg0, 0)) | |
8174 | && ! lookup_attribute ("alias", | |
8175 | DECL_ATTRIBUTES (TREE_OPERAND (arg0, 0))) | |
8176 | && ! DECL_EXTERNAL (TREE_OPERAND (arg0, 0)) | |
8177 | && TREE_CODE (arg1) == ADDR_EXPR | |
8178 | && DECL_P (TREE_OPERAND (arg1, 0)) | |
8179 | && ! DECL_WEAK (TREE_OPERAND (arg1, 0)) | |
8180 | && ! lookup_attribute ("alias", | |
8181 | DECL_ATTRIBUTES (TREE_OPERAND (arg1, 0))) | |
8182 | && ! DECL_EXTERNAL (TREE_OPERAND (arg1, 0))) | |
20783f07 | 8183 | return constant_boolean_node (operand_equal_p (arg0, arg1, 0) |
8184 | ? code == EQ_EXPR : code != EQ_EXPR, | |
8185 | type); | |
4a755ae7 | 8186 | |
88b41b10 | 8187 | if (FLOAT_TYPE_P (TREE_TYPE (arg0))) |
8188 | { | |
8cce4b41 | 8189 | tree targ0 = strip_float_extensions (arg0); |
8190 | tree targ1 = strip_float_extensions (arg1); | |
8191 | tree newtype = TREE_TYPE (targ0); | |
8192 | ||
8193 | if (TYPE_PRECISION (TREE_TYPE (targ1)) > TYPE_PRECISION (newtype)) | |
8194 | newtype = TREE_TYPE (targ1); | |
8195 | ||
8196 | /* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */ | |
8197 | if (TYPE_PRECISION (newtype) < TYPE_PRECISION (TREE_TYPE (arg0))) | |
fd96eeef | 8198 | return fold (build2 (code, type, fold_convert (newtype, targ0), |
8199 | fold_convert (newtype, targ1))); | |
8cce4b41 | 8200 | |
88b41b10 | 8201 | /* (-a) CMP (-b) -> b CMP a */ |
8202 | if (TREE_CODE (arg0) == NEGATE_EXPR | |
8203 | && TREE_CODE (arg1) == NEGATE_EXPR) | |
fd96eeef | 8204 | return fold (build2 (code, type, TREE_OPERAND (arg1, 0), |
8205 | TREE_OPERAND (arg0, 0))); | |
6d2e901f | 8206 | |
8207 | if (TREE_CODE (arg1) == REAL_CST) | |
8208 | { | |
8209 | REAL_VALUE_TYPE cst; | |
8210 | cst = TREE_REAL_CST (arg1); | |
8211 | ||
8212 | /* (-a) CMP CST -> a swap(CMP) (-CST) */ | |
8213 | if (TREE_CODE (arg0) == NEGATE_EXPR) | |
8214 | return | |
fd96eeef | 8215 | fold (build2 (swap_tree_comparison (code), type, |
8216 | TREE_OPERAND (arg0, 0), | |
8217 | build_real (TREE_TYPE (arg1), | |
8218 | REAL_VALUE_NEGATE (cst)))); | |
6d2e901f | 8219 | |
8220 | /* IEEE doesn't distinguish +0 and -0 in comparisons. */ | |
8221 | /* a CMP (-0) -> a CMP 0 */ | |
8222 | if (REAL_VALUE_MINUS_ZERO (cst)) | |
fd96eeef | 8223 | return fold (build2 (code, type, arg0, |
8224 | build_real (TREE_TYPE (arg1), dconst0))); | |
6d2e901f | 8225 | |
8226 | /* x != NaN is always true, other ops are always false. */ | |
8227 | if (REAL_VALUE_ISNAN (cst) | |
8228 | && ! HONOR_SNANS (TYPE_MODE (TREE_TYPE (arg1)))) | |
8229 | { | |
53f78329 | 8230 | tem = (code == NE_EXPR) ? integer_one_node : integer_zero_node; |
20783f07 | 8231 | return omit_one_operand (type, tem, arg0); |
6d2e901f | 8232 | } |
8233 | ||
8234 | /* Fold comparisons against infinity. */ | |
8235 | if (REAL_VALUE_ISINF (cst)) | |
8236 | { | |
8237 | tem = fold_inf_compare (code, type, arg0, arg1); | |
8238 | if (tem != NULL_TREE) | |
8239 | return tem; | |
8240 | } | |
8241 | } | |
88b41b10 | 8242 | |
f4185d2b | 8243 | /* If this is a comparison of a real constant with a PLUS_EXPR |
8244 | or a MINUS_EXPR of a real constant, we can convert it into a | |
8245 | comparison with a revised real constant as long as no overflow | |
8246 | occurs when unsafe_math_optimizations are enabled. */ | |
8247 | if (flag_unsafe_math_optimizations | |
8248 | && TREE_CODE (arg1) == REAL_CST | |
8249 | && (TREE_CODE (arg0) == PLUS_EXPR | |
8250 | || TREE_CODE (arg0) == MINUS_EXPR) | |
8251 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == REAL_CST | |
8252 | && 0 != (tem = const_binop (TREE_CODE (arg0) == PLUS_EXPR | |
8253 | ? MINUS_EXPR : PLUS_EXPR, | |
8254 | arg1, TREE_OPERAND (arg0, 1), 0)) | |
8255 | && ! TREE_CONSTANT_OVERFLOW (tem)) | |
fd96eeef | 8256 | return fold (build2 (code, type, TREE_OPERAND (arg0, 0), tem)); |
4b0b9adb | 8257 | |
edc21ba8 | 8258 | /* Likewise, we can simplify a comparison of a real constant with |
8259 | a MINUS_EXPR whose first operand is also a real constant, i.e. | |
8260 | (c1 - x) < c2 becomes x > c1-c2. */ | |
8261 | if (flag_unsafe_math_optimizations | |
8262 | && TREE_CODE (arg1) == REAL_CST | |
8263 | && TREE_CODE (arg0) == MINUS_EXPR | |
8264 | && TREE_CODE (TREE_OPERAND (arg0, 0)) == REAL_CST | |
8265 | && 0 != (tem = const_binop (MINUS_EXPR, TREE_OPERAND (arg0, 0), | |
8266 | arg1, 0)) | |
8267 | && ! TREE_CONSTANT_OVERFLOW (tem)) | |
fd96eeef | 8268 | return fold (build2 (swap_tree_comparison (code), type, |
8269 | TREE_OPERAND (arg0, 1), tem)); | |
edc21ba8 | 8270 | |
4b0b9adb | 8271 | /* Fold comparisons against built-in math functions. */ |
8272 | if (TREE_CODE (arg1) == REAL_CST | |
8273 | && flag_unsafe_math_optimizations | |
8274 | && ! flag_errno_math) | |
8275 | { | |
8276 | enum built_in_function fcode = builtin_mathfn_code (arg0); | |
8277 | ||
8278 | if (fcode != END_BUILTINS) | |
8279 | { | |
8280 | tem = fold_mathfn_compare (fcode, code, type, arg0, arg1); | |
8281 | if (tem != NULL_TREE) | |
8282 | return tem; | |
8283 | } | |
8284 | } | |
2bc77e10 | 8285 | } |
8286 | ||
0e2fb02d | 8287 | /* Convert foo++ == CONST into ++foo == CONST + INCR. */ |
8288 | if (TREE_CONSTANT (arg1) | |
8289 | && (TREE_CODE (arg0) == POSTINCREMENT_EXPR | |
8290 | || TREE_CODE (arg0) == POSTDECREMENT_EXPR) | |
8291 | /* This optimization is invalid for ordered comparisons | |
8292 | if CONST+INCR overflows or if foo+incr might overflow. | |
8293 | This optimization is invalid for floating point due to rounding. | |
8294 | For pointer types we assume overflow doesn't happen. */ | |
8295 | && (POINTER_TYPE_P (TREE_TYPE (arg0)) | |
8296 | || (INTEGRAL_TYPE_P (TREE_TYPE (arg0)) | |
8297 | && (code == EQ_EXPR || code == NE_EXPR)))) | |
8298 | { | |
8299 | tree varop, newconst; | |
2bc77e10 | 8300 | |
0e2fb02d | 8301 | if (TREE_CODE (arg0) == POSTINCREMENT_EXPR) |
8302 | { | |
8303 | newconst = fold (build2 (PLUS_EXPR, TREE_TYPE (arg0), | |
8304 | arg1, TREE_OPERAND (arg0, 1))); | |
8305 | varop = build2 (PREINCREMENT_EXPR, TREE_TYPE (arg0), | |
8306 | TREE_OPERAND (arg0, 0), | |
8307 | TREE_OPERAND (arg0, 1)); | |
8308 | } | |
8309 | else | |
8310 | { | |
8311 | newconst = fold (build2 (MINUS_EXPR, TREE_TYPE (arg0), | |
8312 | arg1, TREE_OPERAND (arg0, 1))); | |
8313 | varop = build2 (PREDECREMENT_EXPR, TREE_TYPE (arg0), | |
8314 | TREE_OPERAND (arg0, 0), | |
8315 | TREE_OPERAND (arg0, 1)); | |
8316 | } | |
2bc77e10 | 8317 | |
0e2fb02d | 8318 | |
8319 | /* If VAROP is a reference to a bitfield, we must mask | |
8320 | the constant by the width of the field. */ | |
8321 | if (TREE_CODE (TREE_OPERAND (varop, 0)) == COMPONENT_REF | |
6374121b | 8322 | && DECL_BIT_FIELD (TREE_OPERAND (TREE_OPERAND (varop, 0), 1)) |
8323 | && host_integerp (DECL_SIZE (TREE_OPERAND | |
8324 | (TREE_OPERAND (varop, 0), 1)), 1)) | |
0e2fb02d | 8325 | { |
8326 | tree fielddecl = TREE_OPERAND (TREE_OPERAND (varop, 0), 1); | |
6374121b | 8327 | HOST_WIDE_INT size = tree_low_cst (DECL_SIZE (fielddecl), 1); |
9ab9151d | 8328 | tree folded_compare, shift; |
0e2fb02d | 8329 | |
8330 | /* First check whether the comparison would come out | |
8331 | always the same. If we don't do that we would | |
8332 | change the meaning with the masking. */ | |
8333 | folded_compare = fold (build2 (code, type, | |
6374121b | 8334 | TREE_OPERAND (varop, 0), arg1)); |
0e2fb02d | 8335 | if (integer_zerop (folded_compare) |
8336 | || integer_onep (folded_compare)) | |
8337 | return omit_one_operand (type, folded_compare, varop); | |
8338 | ||
7c446c95 | 8339 | shift = build_int_cst (NULL_TREE, |
7016c612 | 8340 | TYPE_PRECISION (TREE_TYPE (varop)) - size); |
6374121b | 8341 | shift = fold_convert (TREE_TYPE (varop), shift); |
9ab9151d | 8342 | newconst = fold (build2 (LSHIFT_EXPR, TREE_TYPE (varop), |
8343 | newconst, shift)); | |
8344 | newconst = fold (build2 (RSHIFT_EXPR, TREE_TYPE (varop), | |
8345 | newconst, shift)); | |
0e2fb02d | 8346 | } |
8347 | ||
8348 | return fold (build2 (code, type, varop, newconst)); | |
8349 | } | |
2bc77e10 | 8350 | |
7df2ee7b | 8351 | /* Change X >= C to X > (C - 1) and X < C to X <= (C - 1) if C > 0. |
8352 | This transformation affects the cases which are handled in later | |
8353 | optimizations involving comparisons with non-negative constants. */ | |
8354 | if (TREE_CODE (arg1) == INTEGER_CST | |
8355 | && TREE_CODE (arg0) != INTEGER_CST | |
8356 | && tree_int_cst_sgn (arg1) > 0) | |
8357 | { | |
8358 | switch (code) | |
8359 | { | |
8360 | case GE_EXPR: | |
7df2ee7b | 8361 | arg1 = const_binop (MINUS_EXPR, arg1, integer_one_node, 0); |
fd96eeef | 8362 | return fold (build2 (GT_EXPR, type, arg0, arg1)); |
7df2ee7b | 8363 | |
8364 | case LT_EXPR: | |
7df2ee7b | 8365 | arg1 = const_binop (MINUS_EXPR, arg1, integer_one_node, 0); |
fd96eeef | 8366 | return fold (build2 (LE_EXPR, type, arg0, arg1)); |
7df2ee7b | 8367 | |
8368 | default: | |
8369 | break; | |
8370 | } | |
8371 | } | |
8372 | ||
8539da5e | 8373 | /* Comparisons with the highest or lowest possible integer of |
7206da1b | 8374 | the specified size will have known values. |
4ee9c684 | 8375 | |
8376 | This is quite similar to fold_relational_hi_lo; however, my | |
8377 | attempts to share the code have been nothing but trouble. | |
8378 | I give up for now. */ | |
8539da5e | 8379 | { |
8380 | int width = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (arg1))); | |
8381 | ||
8382 | if (TREE_CODE (arg1) == INTEGER_CST | |
8383 | && ! TREE_CONSTANT_OVERFLOW (arg1) | |
8384 | && width <= HOST_BITS_PER_WIDE_INT | |
8385 | && (INTEGRAL_TYPE_P (TREE_TYPE (arg1)) | |
8386 | || POINTER_TYPE_P (TREE_TYPE (arg1)))) | |
8387 | { | |
7df2ee7b | 8388 | unsigned HOST_WIDE_INT signed_max; |
8389 | unsigned HOST_WIDE_INT max, min; | |
8390 | ||
8391 | signed_max = ((unsigned HOST_WIDE_INT) 1 << (width - 1)) - 1; | |
8392 | ||
78a8ed03 | 8393 | if (TYPE_UNSIGNED (TREE_TYPE (arg1))) |
7df2ee7b | 8394 | { |
8395 | max = ((unsigned HOST_WIDE_INT) 2 << (width - 1)) - 1; | |
8396 | min = 0; | |
8397 | } | |
8398 | else | |
8399 | { | |
8400 | max = signed_max; | |
8401 | min = ((unsigned HOST_WIDE_INT) -1 << (width - 1)); | |
8402 | } | |
8403 | ||
8539da5e | 8404 | if (TREE_INT_CST_HIGH (arg1) == 0 |
7df2ee7b | 8405 | && TREE_INT_CST_LOW (arg1) == max) |
8406 | switch (code) | |
8539da5e | 8407 | { |
8408 | case GT_EXPR: | |
20783f07 | 8409 | return omit_one_operand (type, integer_zero_node, arg0); |
8410 | ||
8539da5e | 8411 | case GE_EXPR: |
fd96eeef | 8412 | return fold (build2 (EQ_EXPR, type, arg0, arg1)); |
88e11d8f | 8413 | |
8539da5e | 8414 | case LE_EXPR: |
20783f07 | 8415 | return omit_one_operand (type, integer_one_node, arg0); |
8416 | ||
8539da5e | 8417 | case LT_EXPR: |
fd96eeef | 8418 | return fold (build2 (NE_EXPR, type, arg0, arg1)); |
8539da5e | 8419 | |
7df2ee7b | 8420 | /* The GE_EXPR and LT_EXPR cases above are not normally |
88e11d8f | 8421 | reached because of previous transformations. */ |
7df2ee7b | 8422 | |
8539da5e | 8423 | default: |
8424 | break; | |
8425 | } | |
7df2ee7b | 8426 | else if (TREE_INT_CST_HIGH (arg1) == 0 |
8427 | && TREE_INT_CST_LOW (arg1) == max - 1) | |
8428 | switch (code) | |
8429 | { | |
8430 | case GT_EXPR: | |
7df2ee7b | 8431 | arg1 = const_binop (PLUS_EXPR, arg1, integer_one_node, 0); |
fd96eeef | 8432 | return fold (build2 (EQ_EXPR, type, arg0, arg1)); |
7df2ee7b | 8433 | case LE_EXPR: |
7df2ee7b | 8434 | arg1 = const_binop (PLUS_EXPR, arg1, integer_one_node, 0); |
fd96eeef | 8435 | return fold (build2 (NE_EXPR, type, arg0, arg1)); |
7df2ee7b | 8436 | default: |
8437 | break; | |
8438 | } | |
8439 | else if (TREE_INT_CST_HIGH (arg1) == (min ? -1 : 0) | |
8440 | && TREE_INT_CST_LOW (arg1) == min) | |
8441 | switch (code) | |
8539da5e | 8442 | { |
8443 | case LT_EXPR: | |
20783f07 | 8444 | return omit_one_operand (type, integer_zero_node, arg0); |
8445 | ||
8539da5e | 8446 | case LE_EXPR: |
fd96eeef | 8447 | return fold (build2 (EQ_EXPR, type, arg0, arg1)); |
8539da5e | 8448 | |
8449 | case GE_EXPR: | |
20783f07 | 8450 | return omit_one_operand (type, integer_one_node, arg0); |
8451 | ||
8539da5e | 8452 | case GT_EXPR: |
fd96eeef | 8453 | return fold (build2 (NE_EXPR, type, arg0, arg1)); |
8539da5e | 8454 | |
8455 | default: | |
8456 | break; | |
8457 | } | |
7df2ee7b | 8458 | else if (TREE_INT_CST_HIGH (arg1) == (min ? -1 : 0) |
8459 | && TREE_INT_CST_LOW (arg1) == min + 1) | |
8460 | switch (code) | |
8461 | { | |
8462 | case GE_EXPR: | |
7df2ee7b | 8463 | arg1 = const_binop (MINUS_EXPR, arg1, integer_one_node, 0); |
fd96eeef | 8464 | return fold (build2 (NE_EXPR, type, arg0, arg1)); |
7df2ee7b | 8465 | case LT_EXPR: |
7df2ee7b | 8466 | arg1 = const_binop (MINUS_EXPR, arg1, integer_one_node, 0); |
fd96eeef | 8467 | return fold (build2 (EQ_EXPR, type, arg0, arg1)); |
7df2ee7b | 8468 | default: |
8469 | break; | |
8470 | } | |
8539da5e | 8471 | |
4ee9c684 | 8472 | else if (!in_gimple_form |
8473 | && TREE_INT_CST_HIGH (arg1) == 0 | |
7df2ee7b | 8474 | && TREE_INT_CST_LOW (arg1) == signed_max |
78a8ed03 | 8475 | && TYPE_UNSIGNED (TREE_TYPE (arg1)) |
8539da5e | 8476 | /* signed_type does not work on pointer types. */ |
8477 | && INTEGRAL_TYPE_P (TREE_TYPE (arg1))) | |
8478 | { | |
7df2ee7b | 8479 | /* The following case also applies to X < signed_max+1 |
8480 | and X >= signed_max+1 because previous transformations. */ | |
8481 | if (code == LE_EXPR || code == GT_EXPR) | |
8539da5e | 8482 | { |
8483 | tree st0, st1; | |
fa8b888f | 8484 | st0 = lang_hooks.types.signed_type (TREE_TYPE (arg0)); |
8485 | st1 = lang_hooks.types.signed_type (TREE_TYPE (arg1)); | |
8539da5e | 8486 | return fold |
fd96eeef | 8487 | (build2 (code == LE_EXPR ? GE_EXPR: LT_EXPR, |
8488 | type, fold_convert (st0, arg0), | |
8489 | fold_convert (st1, integer_zero_node))); | |
8539da5e | 8490 | } |
8491 | } | |
8539da5e | 8492 | } |
8493 | } | |
8494 | ||
155b05dc | 8495 | /* If this is an EQ or NE comparison of a constant with a PLUS_EXPR or |
8496 | a MINUS_EXPR of a constant, we can convert it into a comparison with | |
8497 | a revised constant as long as no overflow occurs. */ | |
8498 | if ((code == EQ_EXPR || code == NE_EXPR) | |
8499 | && TREE_CODE (arg1) == INTEGER_CST | |
8500 | && (TREE_CODE (arg0) == PLUS_EXPR | |
8501 | || TREE_CODE (arg0) == MINUS_EXPR) | |
8502 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST | |
8503 | && 0 != (tem = const_binop (TREE_CODE (arg0) == PLUS_EXPR | |
8504 | ? MINUS_EXPR : PLUS_EXPR, | |
8505 | arg1, TREE_OPERAND (arg0, 1), 0)) | |
8506 | && ! TREE_CONSTANT_OVERFLOW (tem)) | |
fd96eeef | 8507 | return fold (build2 (code, type, TREE_OPERAND (arg0, 0), tem)); |
155b05dc | 8508 | |
8509 | /* Similarly for a NEGATE_EXPR. */ | |
8510 | else if ((code == EQ_EXPR || code == NE_EXPR) | |
8511 | && TREE_CODE (arg0) == NEGATE_EXPR | |
8512 | && TREE_CODE (arg1) == INTEGER_CST | |
23ec2d5e | 8513 | && 0 != (tem = negate_expr (arg1)) |
155b05dc | 8514 | && TREE_CODE (tem) == INTEGER_CST |
8515 | && ! TREE_CONSTANT_OVERFLOW (tem)) | |
fd96eeef | 8516 | return fold (build2 (code, type, TREE_OPERAND (arg0, 0), tem)); |
155b05dc | 8517 | |
8518 | /* If we have X - Y == 0, we can convert that to X == Y and similarly | |
8519 | for !=. Don't do this for ordered comparisons due to overflow. */ | |
8520 | else if ((code == NE_EXPR || code == EQ_EXPR) | |
8521 | && integer_zerop (arg1) && TREE_CODE (arg0) == MINUS_EXPR) | |
fd96eeef | 8522 | return fold (build2 (code, type, |
8523 | TREE_OPERAND (arg0, 0), TREE_OPERAND (arg0, 1))); | |
155b05dc | 8524 | |
155b05dc | 8525 | else if (TREE_CODE (TREE_TYPE (arg0)) == INTEGER_TYPE |
faab57e3 | 8526 | && TREE_CODE (arg0) == NOP_EXPR) |
8527 | { | |
8528 | /* If we are widening one operand of an integer comparison, | |
8529 | see if the other operand is similarly being widened. Perhaps we | |
8530 | can do the comparison in the narrower type. */ | |
8531 | tem = fold_widened_comparison (code, type, arg0, arg1); | |
8532 | if (tem) | |
8533 | return tem; | |
8534 | ||
8535 | /* Or if we are changing signedness. */ | |
8536 | tem = fold_sign_changed_comparison (code, type, arg0, arg1); | |
8537 | if (tem) | |
8538 | return tem; | |
8539 | } | |
cc049fa3 | 8540 | |
155b05dc | 8541 | /* If this is comparing a constant with a MIN_EXPR or a MAX_EXPR of a |
8542 | constant, we can simplify it. */ | |
8543 | else if (TREE_CODE (arg1) == INTEGER_CST | |
8544 | && (TREE_CODE (arg0) == MIN_EXPR | |
8545 | || TREE_CODE (arg0) == MAX_EXPR) | |
8546 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST) | |
8547 | return optimize_minmax_comparison (t); | |
8548 | ||
8549 | /* If we are comparing an ABS_EXPR with a constant, we can | |
8550 | convert all the cases into explicit comparisons, but they may | |
8551 | well not be faster than doing the ABS and one comparison. | |
8552 | But ABS (X) <= C is a range comparison, which becomes a subtraction | |
8553 | and a comparison, and is probably faster. */ | |
8554 | else if (code == LE_EXPR && TREE_CODE (arg1) == INTEGER_CST | |
8555 | && TREE_CODE (arg0) == ABS_EXPR | |
23ec2d5e | 8556 | && ! TREE_SIDE_EFFECTS (arg0) |
8557 | && (0 != (tem = negate_expr (arg1))) | |
8558 | && TREE_CODE (tem) == INTEGER_CST | |
8559 | && ! TREE_CONSTANT_OVERFLOW (tem)) | |
fd96eeef | 8560 | return fold (build2 (TRUTH_ANDIF_EXPR, type, |
8561 | build2 (GE_EXPR, type, | |
8562 | TREE_OPERAND (arg0, 0), tem), | |
8563 | build2 (LE_EXPR, type, | |
8564 | TREE_OPERAND (arg0, 0), arg1))); | |
cc049fa3 | 8565 | |
2bc77e10 | 8566 | /* If this is an EQ or NE comparison with zero and ARG0 is |
8567 | (1 << foo) & bar, convert it to (bar >> foo) & 1. Both require | |
8568 | two operations, but the latter can be done in one less insn | |
0dbd1c74 | 8569 | on machines that have only two-operand insns or on which a |
2bc77e10 | 8570 | constant cannot be the first operand. */ |
8571 | if (integer_zerop (arg1) && (code == EQ_EXPR || code == NE_EXPR) | |
8572 | && TREE_CODE (arg0) == BIT_AND_EXPR) | |
8573 | { | |
fd96eeef | 8574 | tree arg00 = TREE_OPERAND (arg0, 0); |
8575 | tree arg01 = TREE_OPERAND (arg0, 1); | |
8576 | if (TREE_CODE (arg00) == LSHIFT_EXPR | |
8577 | && integer_onep (TREE_OPERAND (arg00, 0))) | |
2bc77e10 | 8578 | return |
fd96eeef | 8579 | fold (build2 (code, type, |
8580 | build2 (BIT_AND_EXPR, TREE_TYPE (arg0), | |
8581 | build2 (RSHIFT_EXPR, TREE_TYPE (arg00), | |
8582 | arg01, TREE_OPERAND (arg00, 1)), | |
8583 | fold_convert (TREE_TYPE (arg0), | |
8584 | integer_one_node)), | |
8585 | arg1)); | |
2bc77e10 | 8586 | else if (TREE_CODE (TREE_OPERAND (arg0, 1)) == LSHIFT_EXPR |
8587 | && integer_onep (TREE_OPERAND (TREE_OPERAND (arg0, 1), 0))) | |
8588 | return | |
fd96eeef | 8589 | fold (build2 (code, type, |
8590 | build2 (BIT_AND_EXPR, TREE_TYPE (arg0), | |
8591 | build2 (RSHIFT_EXPR, TREE_TYPE (arg01), | |
8592 | arg00, TREE_OPERAND (arg01, 1)), | |
8593 | fold_convert (TREE_TYPE (arg0), | |
8594 | integer_one_node)), | |
8595 | arg1)); | |
2bc77e10 | 8596 | } |
8597 | ||
c393c7ff | 8598 | /* If this is an NE or EQ comparison of zero against the result of a |
722b90ac | 8599 | signed MOD operation whose second operand is a power of 2, make |
8600 | the MOD operation unsigned since it is simpler and equivalent. */ | |
c393c7ff | 8601 | if ((code == NE_EXPR || code == EQ_EXPR) |
8602 | && integer_zerop (arg1) | |
78a8ed03 | 8603 | && !TYPE_UNSIGNED (TREE_TYPE (arg0)) |
c393c7ff | 8604 | && (TREE_CODE (arg0) == TRUNC_MOD_EXPR |
8605 | || TREE_CODE (arg0) == CEIL_MOD_EXPR | |
8606 | || TREE_CODE (arg0) == FLOOR_MOD_EXPR | |
722b90ac | 8607 | || TREE_CODE (arg0) == ROUND_MOD_EXPR) |
8608 | && integer_pow2p (TREE_OPERAND (arg0, 1))) | |
c393c7ff | 8609 | { |
fa8b888f | 8610 | tree newtype = lang_hooks.types.unsigned_type (TREE_TYPE (arg0)); |
662f41e4 | 8611 | tree newmod = fold (build2 (TREE_CODE (arg0), newtype, |
8612 | fold_convert (newtype, | |
8613 | TREE_OPERAND (arg0, 0)), | |
8614 | fold_convert (newtype, | |
8615 | TREE_OPERAND (arg0, 1)))); | |
8616 | ||
8617 | return fold (build2 (code, type, newmod, | |
8618 | fold_convert (newtype, arg1))); | |
c393c7ff | 8619 | } |
8620 | ||
2bc77e10 | 8621 | /* If this is an NE comparison of zero with an AND of one, remove the |
8622 | comparison since the AND will give the correct value. */ | |
8623 | if (code == NE_EXPR && integer_zerop (arg1) | |
8624 | && TREE_CODE (arg0) == BIT_AND_EXPR | |
8625 | && integer_onep (TREE_OPERAND (arg0, 1))) | |
b30e3dbc | 8626 | return fold_convert (type, arg0); |
2bc77e10 | 8627 | |
8628 | /* If we have (A & C) == C where C is a power of 2, convert this into | |
8629 | (A & C) != 0. Similarly for NE_EXPR. */ | |
8630 | if ((code == EQ_EXPR || code == NE_EXPR) | |
8631 | && TREE_CODE (arg0) == BIT_AND_EXPR | |
8632 | && integer_pow2p (TREE_OPERAND (arg0, 1)) | |
8633 | && operand_equal_p (TREE_OPERAND (arg0, 1), arg1, 0)) | |
fd96eeef | 8634 | return fold (build2 (code == EQ_EXPR ? NE_EXPR : EQ_EXPR, type, |
5c9198bd | 8635 | arg0, fold_convert (TREE_TYPE (arg0), |
8636 | integer_zero_node))); | |
203a24c4 | 8637 | |
6881f973 | 8638 | /* If we have (A & C) != 0 or (A & C) == 0 and C is a power of |
8639 | 2, then fold the expression into shifts and logical operations. */ | |
8640 | tem = fold_single_bit_test (code, arg0, arg1, type); | |
8641 | if (tem) | |
8642 | return tem; | |
2bc77e10 | 8643 | |
0e0b35f9 | 8644 | /* If we have (A & C) == D where D & ~C != 0, convert this into 0. |
8645 | Similarly for NE_EXPR. */ | |
8646 | if ((code == EQ_EXPR || code == NE_EXPR) | |
8647 | && TREE_CODE (arg0) == BIT_AND_EXPR | |
8648 | && TREE_CODE (arg1) == INTEGER_CST | |
8649 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST) | |
8650 | { | |
ddc4113b | 8651 | tree notc = fold (build1 (BIT_NOT_EXPR, |
8652 | TREE_TYPE (TREE_OPERAND (arg0, 1)), | |
8653 | TREE_OPERAND (arg0, 1))); | |
8654 | tree dandnotc = fold (build2 (BIT_AND_EXPR, TREE_TYPE (arg0), | |
8655 | arg1, notc)); | |
0e0b35f9 | 8656 | tree rslt = code == EQ_EXPR ? integer_zero_node : integer_one_node; |
53c0bbc0 | 8657 | if (integer_nonzerop (dandnotc)) |
0e0b35f9 | 8658 | return omit_one_operand (type, rslt, arg0); |
8659 | } | |
8660 | ||
8661 | /* If we have (A | C) == D where C & ~D != 0, convert this into 0. | |
8662 | Similarly for NE_EXPR. */ | |
8663 | if ((code == EQ_EXPR || code == NE_EXPR) | |
8664 | && TREE_CODE (arg0) == BIT_IOR_EXPR | |
8665 | && TREE_CODE (arg1) == INTEGER_CST | |
8666 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST) | |
8667 | { | |
ddc4113b | 8668 | tree notd = fold (build1 (BIT_NOT_EXPR, TREE_TYPE (arg1), arg1)); |
8669 | tree candnotd = fold (build2 (BIT_AND_EXPR, TREE_TYPE (arg0), | |
8670 | TREE_OPERAND (arg0, 1), notd)); | |
0e0b35f9 | 8671 | tree rslt = code == EQ_EXPR ? integer_zero_node : integer_one_node; |
53c0bbc0 | 8672 | if (integer_nonzerop (candnotd)) |
0e0b35f9 | 8673 | return omit_one_operand (type, rslt, arg0); |
8674 | } | |
8675 | ||
898bfb9d | 8676 | /* If X is unsigned, convert X < (1 << Y) into X >> Y == 0 |
e8526af9 | 8677 | and similarly for >= into !=. */ |
898bfb9d | 8678 | if ((code == LT_EXPR || code == GE_EXPR) |
78a8ed03 | 8679 | && TYPE_UNSIGNED (TREE_TYPE (arg0)) |
898bfb9d | 8680 | && TREE_CODE (arg1) == LSHIFT_EXPR |
8681 | && integer_onep (TREE_OPERAND (arg1, 0))) | |
fd96eeef | 8682 | return build2 (code == LT_EXPR ? EQ_EXPR : NE_EXPR, type, |
8683 | build2 (RSHIFT_EXPR, TREE_TYPE (arg0), arg0, | |
8684 | TREE_OPERAND (arg1, 1)), | |
8685 | fold_convert (TREE_TYPE (arg0), integer_zero_node)); | |
898bfb9d | 8686 | |
8687 | else if ((code == LT_EXPR || code == GE_EXPR) | |
78a8ed03 | 8688 | && TYPE_UNSIGNED (TREE_TYPE (arg0)) |
898bfb9d | 8689 | && (TREE_CODE (arg1) == NOP_EXPR |
8690 | || TREE_CODE (arg1) == CONVERT_EXPR) | |
8691 | && TREE_CODE (TREE_OPERAND (arg1, 0)) == LSHIFT_EXPR | |
8692 | && integer_onep (TREE_OPERAND (TREE_OPERAND (arg1, 0), 0))) | |
8693 | return | |
fd96eeef | 8694 | build2 (code == LT_EXPR ? EQ_EXPR : NE_EXPR, type, |
8695 | fold_convert (TREE_TYPE (arg0), | |
8696 | build2 (RSHIFT_EXPR, TREE_TYPE (arg0), arg0, | |
8697 | TREE_OPERAND (TREE_OPERAND (arg1, 0), | |
8698 | 1))), | |
8699 | fold_convert (TREE_TYPE (arg0), integer_zero_node)); | |
898bfb9d | 8700 | |
e233264a | 8701 | /* Simplify comparison of something with itself. (For IEEE |
8702 | floating-point, we can only do some of these simplifications.) */ | |
8703 | if (operand_equal_p (arg0, arg1, 0)) | |
2bc77e10 | 8704 | { |
8705 | switch (code) | |
8706 | { | |
8707 | case EQ_EXPR: | |
88e11d8f | 8708 | if (! FLOAT_TYPE_P (TREE_TYPE (arg0)) |
8709 | || ! HONOR_NANS (TYPE_MODE (TREE_TYPE (arg0)))) | |
8710 | return constant_boolean_node (1, type); | |
8711 | break; | |
8712 | ||
2bc77e10 | 8713 | case GE_EXPR: |
8714 | case LE_EXPR: | |
d150f981 | 8715 | if (! FLOAT_TYPE_P (TREE_TYPE (arg0)) |
8716 | || ! HONOR_NANS (TYPE_MODE (TREE_TYPE (arg0)))) | |
b4af30fd | 8717 | return constant_boolean_node (1, type); |
fd96eeef | 8718 | return fold (build2 (EQ_EXPR, type, arg0, arg1)); |
e233264a | 8719 | |
2bc77e10 | 8720 | case NE_EXPR: |
d150f981 | 8721 | /* For NE, we can only do this simplification if integer |
8722 | or we don't honor IEEE floating point NaNs. */ | |
8723 | if (FLOAT_TYPE_P (TREE_TYPE (arg0)) | |
8724 | && HONOR_NANS (TYPE_MODE (TREE_TYPE (arg0)))) | |
e233264a | 8725 | break; |
a92771b8 | 8726 | /* ... fall through ... */ |
2bc77e10 | 8727 | case GT_EXPR: |
8728 | case LT_EXPR: | |
b4af30fd | 8729 | return constant_boolean_node (0, type); |
0dbd1c74 | 8730 | default: |
fdada98f | 8731 | gcc_unreachable (); |
2bc77e10 | 8732 | } |
8733 | } | |
8734 | ||
e233264a | 8735 | /* If we are comparing an expression that just has comparisons |
8736 | of two integer values, arithmetic expressions of those comparisons, | |
8737 | and constants, we can simplify it. There are only three cases | |
8738 | to check: the two values can either be equal, the first can be | |
8739 | greater, or the second can be greater. Fold the expression for | |
8740 | those three values. Since each value must be 0 or 1, we have | |
8741 | eight possibilities, each of which corresponds to the constant 0 | |
8742 | or 1 or one of the six possible comparisons. | |
8743 | ||
8744 | This handles common cases like (a > b) == 0 but also handles | |
8745 | expressions like ((x > y) - (y > x)) > 0, which supposedly | |
8746 | occur in macroized code. */ | |
8747 | ||
8748 | if (TREE_CODE (arg1) == INTEGER_CST && TREE_CODE (arg0) != INTEGER_CST) | |
8749 | { | |
8750 | tree cval1 = 0, cval2 = 0; | |
d0314131 | 8751 | int save_p = 0; |
e233264a | 8752 | |
d0314131 | 8753 | if (twoval_comparison_p (arg0, &cval1, &cval2, &save_p) |
e233264a | 8754 | /* Don't handle degenerate cases here; they should already |
8755 | have been handled anyway. */ | |
8756 | && cval1 != 0 && cval2 != 0 | |
8757 | && ! (TREE_CONSTANT (cval1) && TREE_CONSTANT (cval2)) | |
8758 | && TREE_TYPE (cval1) == TREE_TYPE (cval2) | |
780a4395 | 8759 | && INTEGRAL_TYPE_P (TREE_TYPE (cval1)) |
f52483b5 | 8760 | && TYPE_MAX_VALUE (TREE_TYPE (cval1)) |
8761 | && TYPE_MAX_VALUE (TREE_TYPE (cval2)) | |
e233264a | 8762 | && ! operand_equal_p (TYPE_MIN_VALUE (TREE_TYPE (cval1)), |
8763 | TYPE_MAX_VALUE (TREE_TYPE (cval2)), 0)) | |
8764 | { | |
8765 | tree maxval = TYPE_MAX_VALUE (TREE_TYPE (cval1)); | |
8766 | tree minval = TYPE_MIN_VALUE (TREE_TYPE (cval1)); | |
8767 | ||
8768 | /* We can't just pass T to eval_subst in case cval1 or cval2 | |
8769 | was the same as ARG1. */ | |
8770 | ||
8771 | tree high_result | |
fd96eeef | 8772 | = fold (build2 (code, type, |
8773 | eval_subst (arg0, cval1, maxval, | |
8774 | cval2, minval), | |
8775 | arg1)); | |
e233264a | 8776 | tree equal_result |
fd96eeef | 8777 | = fold (build2 (code, type, |
8778 | eval_subst (arg0, cval1, maxval, | |
8779 | cval2, maxval), | |
8780 | arg1)); | |
e233264a | 8781 | tree low_result |
fd96eeef | 8782 | = fold (build2 (code, type, |
8783 | eval_subst (arg0, cval1, minval, | |
8784 | cval2, maxval), | |
8785 | arg1)); | |
e233264a | 8786 | |
8787 | /* All three of these results should be 0 or 1. Confirm they | |
8788 | are. Then use those values to select the proper code | |
8789 | to use. */ | |
8790 | ||
8791 | if ((integer_zerop (high_result) | |
8792 | || integer_onep (high_result)) | |
8793 | && (integer_zerop (equal_result) | |
8794 | || integer_onep (equal_result)) | |
8795 | && (integer_zerop (low_result) | |
8796 | || integer_onep (low_result))) | |
8797 | { | |
8798 | /* Make a 3-bit mask with the high-order bit being the | |
8799 | value for `>', the next for '=', and the low for '<'. */ | |
8800 | switch ((integer_onep (high_result) * 4) | |
8801 | + (integer_onep (equal_result) * 2) | |
8802 | + integer_onep (low_result)) | |
8803 | { | |
8804 | case 0: | |
8805 | /* Always false. */ | |
88d56342 | 8806 | return omit_one_operand (type, integer_zero_node, arg0); |
e233264a | 8807 | case 1: |
8808 | code = LT_EXPR; | |
8809 | break; | |
8810 | case 2: | |
8811 | code = EQ_EXPR; | |
8812 | break; | |
8813 | case 3: | |
8814 | code = LE_EXPR; | |
8815 | break; | |
8816 | case 4: | |
8817 | code = GT_EXPR; | |
8818 | break; | |
8819 | case 5: | |
8820 | code = NE_EXPR; | |
8821 | break; | |
8822 | case 6: | |
8823 | code = GE_EXPR; | |
8824 | break; | |
8825 | case 7: | |
8826 | /* Always true. */ | |
88d56342 | 8827 | return omit_one_operand (type, integer_one_node, arg0); |
e233264a | 8828 | } |
8829 | ||
fd96eeef | 8830 | tem = build2 (code, type, cval1, cval2); |
d0314131 | 8831 | if (save_p) |
53f78329 | 8832 | return save_expr (tem); |
d0314131 | 8833 | else |
53f78329 | 8834 | return fold (tem); |
e233264a | 8835 | } |
8836 | } | |
8837 | } | |
8838 | ||
8839 | /* If this is a comparison of a field, we may be able to simplify it. */ | |
d50b22af | 8840 | if (((TREE_CODE (arg0) == COMPONENT_REF |
fa8b888f | 8841 | && lang_hooks.can_use_bit_fields_p ()) |
6bc517c5 | 8842 | || TREE_CODE (arg0) == BIT_FIELD_REF) |
8843 | && (code == EQ_EXPR || code == NE_EXPR) | |
8844 | /* Handle the constant case even without -O | |
8845 | to make sure the warnings are given. */ | |
8846 | && (optimize || TREE_CODE (arg1) == INTEGER_CST)) | |
8847 | { | |
8848 | t1 = optimize_bit_field_compare (code, type, arg0, arg1); | |
155257be | 8849 | if (t1) |
8850 | return t1; | |
6bc517c5 | 8851 | } |
e233264a | 8852 | |
9e042f31 | 8853 | /* If this is a comparison of complex values and either or both sides |
8854 | are a COMPLEX_EXPR or COMPLEX_CST, it is best to split up the | |
8855 | comparisons and join them with a TRUTH_ANDIF_EXPR or TRUTH_ORIF_EXPR. | |
8856 | This may prevent needless evaluations. */ | |
a77cc7ac | 8857 | if ((code == EQ_EXPR || code == NE_EXPR) |
8858 | && TREE_CODE (TREE_TYPE (arg0)) == COMPLEX_TYPE | |
8859 | && (TREE_CODE (arg0) == COMPLEX_EXPR | |
9e042f31 | 8860 | || TREE_CODE (arg1) == COMPLEX_EXPR |
8861 | || TREE_CODE (arg0) == COMPLEX_CST | |
8862 | || TREE_CODE (arg1) == COMPLEX_CST)) | |
a77cc7ac | 8863 | { |
8864 | tree subtype = TREE_TYPE (TREE_TYPE (arg0)); | |
a0748b7d | 8865 | tree real0, imag0, real1, imag1; |
8866 | ||
8867 | arg0 = save_expr (arg0); | |
8868 | arg1 = save_expr (arg1); | |
8869 | real0 = fold (build1 (REALPART_EXPR, subtype, arg0)); | |
8870 | imag0 = fold (build1 (IMAGPART_EXPR, subtype, arg0)); | |
8871 | real1 = fold (build1 (REALPART_EXPR, subtype, arg1)); | |
8872 | imag1 = fold (build1 (IMAGPART_EXPR, subtype, arg1)); | |
a77cc7ac | 8873 | |
fd96eeef | 8874 | return fold (build2 ((code == EQ_EXPR ? TRUTH_ANDIF_EXPR |
8875 | : TRUTH_ORIF_EXPR), | |
8876 | type, | |
8877 | fold (build2 (code, type, real0, real1)), | |
8878 | fold (build2 (code, type, imag0, imag1)))); | |
a77cc7ac | 8879 | } |
8880 | ||
53e0ea7e | 8881 | /* Optimize comparisons of strlen vs zero to a compare of the |
d3371fcd | 8882 | first character of the string vs zero. To wit, |
de1b648b | 8883 | strlen(ptr) == 0 => *ptr == 0 |
53e0ea7e | 8884 | strlen(ptr) != 0 => *ptr != 0 |
8885 | Other cases should reduce to one of these two (or a constant) | |
8886 | due to the return value of strlen being unsigned. */ | |
8887 | if ((code == EQ_EXPR || code == NE_EXPR) | |
8888 | && integer_zerop (arg1) | |
c6e6ecb1 | 8889 | && TREE_CODE (arg0) == CALL_EXPR) |
53e0ea7e | 8890 | { |
c6e6ecb1 | 8891 | tree fndecl = get_callee_fndecl (arg0); |
53e0ea7e | 8892 | tree arglist; |
8893 | ||
c6e6ecb1 | 8894 | if (fndecl |
53e0ea7e | 8895 | && DECL_BUILT_IN (fndecl) |
8896 | && DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_MD | |
8897 | && DECL_FUNCTION_CODE (fndecl) == BUILT_IN_STRLEN | |
8898 | && (arglist = TREE_OPERAND (arg0, 1)) | |
8899 | && TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) == POINTER_TYPE | |
8900 | && ! TREE_CHAIN (arglist)) | |
fd96eeef | 8901 | return fold (build2 (code, type, |
8902 | build1 (INDIRECT_REF, char_type_node, | |
5c9198bd | 8903 | TREE_VALUE (arglist)), |
8904 | fold_convert (char_type_node, | |
8905 | integer_zero_node))); | |
53e0ea7e | 8906 | } |
8907 | ||
270029e0 | 8908 | /* We can fold X/C1 op C2 where C1 and C2 are integer constants |
8909 | into a single range test. */ | |
8910 | if (TREE_CODE (arg0) == TRUNC_DIV_EXPR | |
8911 | && TREE_CODE (arg1) == INTEGER_CST | |
8912 | && TREE_CODE (TREE_OPERAND (arg0, 1)) == INTEGER_CST | |
8913 | && !integer_zerop (TREE_OPERAND (arg0, 1)) | |
8914 | && !TREE_OVERFLOW (TREE_OPERAND (arg0, 1)) | |
8915 | && !TREE_OVERFLOW (arg1)) | |
8916 | { | |
8917 | t1 = fold_div_compare (code, type, arg0, arg1); | |
8918 | if (t1 != NULL_TREE) | |
8919 | return t1; | |
8920 | } | |
8921 | ||
990af12c | 8922 | if ((code == EQ_EXPR || code == NE_EXPR) |
8923 | && !TREE_SIDE_EFFECTS (arg0) | |
8924 | && integer_zerop (arg1) | |
8925 | && tree_expr_nonzero_p (arg0)) | |
8926 | return constant_boolean_node (code==NE_EXPR, type); | |
8927 | ||
ad46984d | 8928 | t1 = fold_relational_const (code, type, arg0, arg1); |
990af12c | 8929 | return t1 == NULL_TREE ? t : t1; |
2bc77e10 | 8930 | |
2f64c430 | 8931 | case UNORDERED_EXPR: |
8932 | case ORDERED_EXPR: | |
8933 | case UNLT_EXPR: | |
8934 | case UNLE_EXPR: | |
8935 | case UNGT_EXPR: | |
8936 | case UNGE_EXPR: | |
8937 | case UNEQ_EXPR: | |
8938 | case LTGT_EXPR: | |
8939 | if (TREE_CODE (arg0) == REAL_CST && TREE_CODE (arg1) == REAL_CST) | |
8940 | { | |
8941 | t1 = fold_relational_const (code, type, arg0, arg1); | |
8942 | if (t1 != NULL_TREE) | |
8943 | return t1; | |
8944 | } | |
8945 | ||
8946 | /* If the first operand is NaN, the result is constant. */ | |
8947 | if (TREE_CODE (arg0) == REAL_CST | |
8948 | && REAL_VALUE_ISNAN (TREE_REAL_CST (arg0)) | |
8949 | && (code != LTGT_EXPR || ! flag_trapping_math)) | |
8950 | { | |
8951 | t1 = (code == ORDERED_EXPR || code == LTGT_EXPR) | |
8952 | ? integer_zero_node | |
8953 | : integer_one_node; | |
8954 | return omit_one_operand (type, t1, arg1); | |
8955 | } | |
8956 | ||
8957 | /* If the second operand is NaN, the result is constant. */ | |
8958 | if (TREE_CODE (arg1) == REAL_CST | |
8959 | && REAL_VALUE_ISNAN (TREE_REAL_CST (arg1)) | |
8960 | && (code != LTGT_EXPR || ! flag_trapping_math)) | |
8961 | { | |
8962 | t1 = (code == ORDERED_EXPR || code == LTGT_EXPR) | |
8963 | ? integer_zero_node | |
8964 | : integer_one_node; | |
8965 | return omit_one_operand (type, t1, arg0); | |
8966 | } | |
8967 | ||
990af12c | 8968 | /* Simplify unordered comparison of something with itself. */ |
8969 | if ((code == UNLE_EXPR || code == UNGE_EXPR || code == UNEQ_EXPR) | |
8970 | && operand_equal_p (arg0, arg1, 0)) | |
8971 | return constant_boolean_node (1, type); | |
8972 | ||
8973 | if (code == LTGT_EXPR | |
8974 | && !flag_trapping_math | |
8975 | && operand_equal_p (arg0, arg1, 0)) | |
8976 | return constant_boolean_node (0, type); | |
8977 | ||
2f64c430 | 8978 | /* Fold (double)float1 CMP (double)float2 into float1 CMP float2. */ |
8979 | { | |
8980 | tree targ0 = strip_float_extensions (arg0); | |
8981 | tree targ1 = strip_float_extensions (arg1); | |
8982 | tree newtype = TREE_TYPE (targ0); | |
8983 | ||
8984 | if (TYPE_PRECISION (TREE_TYPE (targ1)) > TYPE_PRECISION (newtype)) | |
8985 | newtype = TREE_TYPE (targ1); | |
8986 | ||
8987 | if (TYPE_PRECISION (newtype) < TYPE_PRECISION (TREE_TYPE (arg0))) | |
8988 | return fold (build2 (code, type, fold_convert (newtype, targ0), | |
8989 | fold_convert (newtype, targ1))); | |
8990 | } | |
8991 | ||
8992 | return t; | |
8993 | ||
2bc77e10 | 8994 | case COND_EXPR: |
56753054 | 8995 | /* Pedantic ANSI C says that a conditional expression is never an lvalue, |
8996 | so all simple results must be passed through pedantic_non_lvalue. */ | |
2bc77e10 | 8997 | if (TREE_CODE (arg0) == INTEGER_CST) |
5383eda4 | 8998 | { |
8999 | tem = TREE_OPERAND (t, (integer_zerop (arg0) ? 2 : 1)); | |
9000 | /* Only optimize constant conditions when the selected branch | |
9001 | has the same type as the COND_EXPR. This avoids optimizing | |
9002 | away "c ? x : throw", where the throw has a void type. */ | |
cf0518b3 | 9003 | if (! VOID_TYPE_P (TREE_TYPE (tem)) |
2b03eaaf | 9004 | || VOID_TYPE_P (type)) |
5383eda4 | 9005 | return pedantic_non_lvalue (tem); |
9006 | return t; | |
9007 | } | |
dc3c829a | 9008 | if (operand_equal_p (arg1, TREE_OPERAND (t, 2), 0)) |
6df5edfa | 9009 | return pedantic_omit_one_operand (type, arg1, arg0); |
2bc77e10 | 9010 | |
e233264a | 9011 | /* If we have A op B ? A : C, we may be able to convert this to a |
9012 | simpler expression, depending on the operation and the values | |
920d0fb5 | 9013 | of B and C. Signed zeros prevent all of these transformations, |
0023616d | 9014 | for reasons given above each one. |
2bc77e10 | 9015 | |
0023616d | 9016 | Also try swapping the arguments and inverting the conditional. */ |
ce45a448 | 9017 | if (COMPARISON_CLASS_P (arg0) |
e233264a | 9018 | && operand_equal_for_comparison_p (TREE_OPERAND (arg0, 0), |
920d0fb5 | 9019 | arg1, TREE_OPERAND (arg0, 1)) |
9020 | && !HONOR_SIGNED_ZEROS (TYPE_MODE (TREE_TYPE (arg1)))) | |
2bc77e10 | 9021 | { |
0023616d | 9022 | tem = fold_cond_expr_with_comparison (type, arg0, |
9b1fa4a0 | 9023 | TREE_OPERAND (t, 1), |
0023616d | 9024 | TREE_OPERAND (t, 2)); |
9025 | if (tem) | |
9026 | return tem; | |
9027 | } | |
e233264a | 9028 | |
ce45a448 | 9029 | if (COMPARISON_CLASS_P (arg0) |
0023616d | 9030 | && operand_equal_for_comparison_p (TREE_OPERAND (arg0, 0), |
9031 | TREE_OPERAND (t, 2), | |
9032 | TREE_OPERAND (arg0, 1)) | |
9033 | && !HONOR_SIGNED_ZEROS (TYPE_MODE (TREE_TYPE (TREE_OPERAND (t, 2))))) | |
9034 | { | |
9035 | tem = invert_truthvalue (arg0); | |
ce45a448 | 9036 | if (COMPARISON_CLASS_P (tem)) |
5923aeca | 9037 | { |
9b1fa4a0 | 9038 | tem = fold_cond_expr_with_comparison (type, tem, |
9039 | TREE_OPERAND (t, 2), | |
9040 | TREE_OPERAND (t, 1)); | |
0023616d | 9041 | if (tem) |
9042 | return tem; | |
5923aeca | 9043 | } |
2bc77e10 | 9044 | } |
9045 | ||
2483911d | 9046 | /* If the second operand is simpler than the third, swap them |
9047 | since that produces better jump optimization results. */ | |
bd214d13 | 9048 | if (tree_swap_operands_p (TREE_OPERAND (t, 1), |
9049 | TREE_OPERAND (t, 2), false)) | |
2483911d | 9050 | { |
9051 | /* See if this can be inverted. If it can't, possibly because | |
9052 | it was a floating-point inequality comparison, don't do | |
9053 | anything. */ | |
9054 | tem = invert_truthvalue (arg0); | |
9055 | ||
9056 | if (TREE_CODE (tem) != TRUTH_NOT_EXPR) | |
fd96eeef | 9057 | return fold (build3 (code, type, tem, |
9058 | TREE_OPERAND (t, 2), TREE_OPERAND (t, 1))); | |
2483911d | 9059 | } |
9060 | ||
e233264a | 9061 | /* Convert A ? 1 : 0 to simply A. */ |
9062 | if (integer_onep (TREE_OPERAND (t, 1)) | |
9063 | && integer_zerop (TREE_OPERAND (t, 2)) | |
9064 | /* If we try to convert TREE_OPERAND (t, 0) to our type, the | |
cc049fa3 | 9065 | call to fold will try to move the conversion inside |
e233264a | 9066 | a COND, which will recurse. In that case, the COND_EXPR |
9067 | is probably the best choice, so leave it alone. */ | |
9068 | && type == TREE_TYPE (arg0)) | |
56753054 | 9069 | return pedantic_non_lvalue (arg0); |
2bc77e10 | 9070 | |
7687025a | 9071 | /* Convert A ? 0 : 1 to !A. This prefers the use of NOT_EXPR |
9072 | over COND_EXPR in cases such as floating point comparisons. */ | |
9073 | if (integer_zerop (TREE_OPERAND (t, 1)) | |
9074 | && integer_onep (TREE_OPERAND (t, 2)) | |
9075 | && truth_value_p (TREE_CODE (arg0))) | |
b30e3dbc | 9076 | return pedantic_non_lvalue (fold_convert (type, |
9077 | invert_truthvalue (arg0))); | |
7687025a | 9078 | |
0023616d | 9079 | /* A < 0 ? <sign bit of A> : 0 is simply (A & <sign bit of A>). */ |
9080 | if (TREE_CODE (arg0) == LT_EXPR | |
9081 | && integer_zerop (TREE_OPERAND (arg0, 1)) | |
9082 | && integer_zerop (TREE_OPERAND (t, 2)) | |
9083 | && (tem = sign_bit_p (TREE_OPERAND (arg0, 0), arg1))) | |
9084 | return fold_convert (type, fold (build2 (BIT_AND_EXPR, | |
9085 | TREE_TYPE (tem), tem, arg1))); | |
9086 | ||
9087 | /* (A >> N) & 1 ? (1 << N) : 0 is simply A & (1 << N). A & 1 was | |
9088 | already handled above. */ | |
9089 | if (TREE_CODE (arg0) == BIT_AND_EXPR | |
9090 | && integer_onep (TREE_OPERAND (arg0, 1)) | |
9091 | && integer_zerop (TREE_OPERAND (t, 2)) | |
9092 | && integer_pow2p (arg1)) | |
9093 | { | |
9094 | tree tem = TREE_OPERAND (arg0, 0); | |
9095 | STRIP_NOPS (tem); | |
9096 | if (TREE_CODE (tem) == RSHIFT_EXPR | |
c738d48d | 9097 | && TREE_CODE (TREE_OPERAND (tem, 1)) == INTEGER_CST |
0023616d | 9098 | && (unsigned HOST_WIDE_INT) tree_log2 (arg1) == |
9099 | TREE_INT_CST_LOW (TREE_OPERAND (tem, 1))) | |
9100 | return fold (build2 (BIT_AND_EXPR, type, | |
9101 | TREE_OPERAND (tem, 0), arg1)); | |
9102 | } | |
2bc77e10 | 9103 | |
0023616d | 9104 | /* A & N ? N : 0 is simply A & N if N is a power of two. This |
9105 | is probably obsolete because the first operand should be a | |
9106 | truth value (that's why we have the two cases above), but let's | |
9107 | leave it in until we can confirm this for all front-ends. */ | |
2bc77e10 | 9108 | if (integer_zerop (TREE_OPERAND (t, 2)) |
9109 | && TREE_CODE (arg0) == NE_EXPR | |
9110 | && integer_zerop (TREE_OPERAND (arg0, 1)) | |
e233264a | 9111 | && integer_pow2p (arg1) |
9112 | && TREE_CODE (TREE_OPERAND (arg0, 0)) == BIT_AND_EXPR | |
9113 | && operand_equal_p (TREE_OPERAND (TREE_OPERAND (arg0, 0), 1), | |
4ee9c684 | 9114 | arg1, OEP_ONLY_CONST)) |
b30e3dbc | 9115 | return pedantic_non_lvalue (fold_convert (type, |
9116 | TREE_OPERAND (arg0, 0))); | |
2bc77e10 | 9117 | |
7687025a | 9118 | /* Convert A ? B : 0 into A && B if A and B are truth values. */ |
9119 | if (integer_zerop (TREE_OPERAND (t, 2)) | |
9120 | && truth_value_p (TREE_CODE (arg0)) | |
9121 | && truth_value_p (TREE_CODE (arg1))) | |
0023616d | 9122 | return fold (build2 (TRUTH_ANDIF_EXPR, type, arg0, arg1)); |
7687025a | 9123 | |
9124 | /* Convert A ? B : 1 into !A || B if A and B are truth values. */ | |
9125 | if (integer_onep (TREE_OPERAND (t, 2)) | |
9126 | && truth_value_p (TREE_CODE (arg0)) | |
9127 | && truth_value_p (TREE_CODE (arg1))) | |
9128 | { | |
9129 | /* Only perform transformation if ARG0 is easily inverted. */ | |
9130 | tem = invert_truthvalue (arg0); | |
9131 | if (TREE_CODE (tem) != TRUTH_NOT_EXPR) | |
0023616d | 9132 | return fold (build2 (TRUTH_ORIF_EXPR, type, tem, arg1)); |
7687025a | 9133 | } |
9134 | ||
0023616d | 9135 | /* Convert A ? 0 : B into !A && B if A and B are truth values. */ |
9136 | if (integer_zerop (arg1) | |
9137 | && truth_value_p (TREE_CODE (arg0)) | |
9138 | && truth_value_p (TREE_CODE (TREE_OPERAND (t, 2)))) | |
9139 | { | |
9140 | /* Only perform transformation if ARG0 is easily inverted. */ | |
9141 | tem = invert_truthvalue (arg0); | |
9142 | if (TREE_CODE (tem) != TRUTH_NOT_EXPR) | |
9143 | return fold (build2 (TRUTH_ANDIF_EXPR, type, tem, | |
9144 | TREE_OPERAND (t, 2))); | |
9145 | } | |
9146 | ||
9147 | /* Convert A ? 1 : B into A || B if A and B are truth values. */ | |
9148 | if (integer_onep (arg1) | |
9149 | && truth_value_p (TREE_CODE (arg0)) | |
9150 | && truth_value_p (TREE_CODE (TREE_OPERAND (t, 2)))) | |
9151 | return fold (build2 (TRUTH_ORIF_EXPR, type, arg0, | |
9152 | TREE_OPERAND (t, 2))); | |
9153 | ||
2bc77e10 | 9154 | return t; |
9155 | ||
9156 | case COMPOUND_EXPR: | |
b468bbc6 | 9157 | /* When pedantic, a compound expression can be neither an lvalue |
9158 | nor an integer constant expression. */ | |
a7ea5e81 | 9159 | if (TREE_SIDE_EFFECTS (arg0) || TREE_CONSTANT (arg1)) |
c3ce5d04 | 9160 | return t; |
9161 | /* Don't let (0, 0) be null pointer constant. */ | |
b30e3dbc | 9162 | tem = integer_zerop (arg1) ? build1 (NOP_EXPR, type, arg1) |
9163 | : fold_convert (type, arg1); | |
9164 | return pedantic_non_lvalue (tem); | |
2bc77e10 | 9165 | |
bb6b5123 | 9166 | case COMPLEX_EXPR: |
9167 | if (wins) | |
5b2ade4d | 9168 | return build_complex (type, arg0, arg1); |
bb6b5123 | 9169 | return t; |
9170 | ||
9171 | case REALPART_EXPR: | |
27395c25 | 9172 | if (TREE_CODE (TREE_TYPE (arg0)) != COMPLEX_TYPE) |
bb6b5123 | 9173 | return t; |
9174 | else if (TREE_CODE (arg0) == COMPLEX_EXPR) | |
9175 | return omit_one_operand (type, TREE_OPERAND (arg0, 0), | |
9176 | TREE_OPERAND (arg0, 1)); | |
9177 | else if (TREE_CODE (arg0) == COMPLEX_CST) | |
9178 | return TREE_REALPART (arg0); | |
9179 | else if (TREE_CODE (arg0) == PLUS_EXPR || TREE_CODE (arg0) == MINUS_EXPR) | |
fd96eeef | 9180 | return fold (build2 (TREE_CODE (arg0), type, |
9181 | fold (build1 (REALPART_EXPR, type, | |
9182 | TREE_OPERAND (arg0, 0))), | |
9183 | fold (build1 (REALPART_EXPR, type, | |
9184 | TREE_OPERAND (arg0, 1))))); | |
bb6b5123 | 9185 | return t; |
9186 | ||
9187 | case IMAGPART_EXPR: | |
27395c25 | 9188 | if (TREE_CODE (TREE_TYPE (arg0)) != COMPLEX_TYPE) |
b30e3dbc | 9189 | return fold_convert (type, integer_zero_node); |
bb6b5123 | 9190 | else if (TREE_CODE (arg0) == COMPLEX_EXPR) |
9191 | return omit_one_operand (type, TREE_OPERAND (arg0, 1), | |
9192 | TREE_OPERAND (arg0, 0)); | |
9193 | else if (TREE_CODE (arg0) == COMPLEX_CST) | |
9194 | return TREE_IMAGPART (arg0); | |
9195 | else if (TREE_CODE (arg0) == PLUS_EXPR || TREE_CODE (arg0) == MINUS_EXPR) | |
fd96eeef | 9196 | return fold (build2 (TREE_CODE (arg0), type, |
9197 | fold (build1 (IMAGPART_EXPR, type, | |
9198 | TREE_OPERAND (arg0, 0))), | |
9199 | fold (build1 (IMAGPART_EXPR, type, | |
9200 | TREE_OPERAND (arg0, 1))))); | |
bb6b5123 | 9201 | return t; |
9202 | ||
650e4c94 | 9203 | case CALL_EXPR: |
9204 | /* Check for a built-in function. */ | |
dc3c829a | 9205 | if (TREE_CODE (TREE_OPERAND (t, 0)) == ADDR_EXPR |
9206 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (t, 0), 0)) | |
650e4c94 | 9207 | == FUNCTION_DECL) |
dc3c829a | 9208 | && DECL_BUILT_IN (TREE_OPERAND (TREE_OPERAND (t, 0), 0))) |
650e4c94 | 9209 | { |
f0613857 | 9210 | tree tmp = fold_builtin (t, false); |
650e4c94 | 9211 | if (tmp) |
9212 | return tmp; | |
9213 | } | |
9214 | return t; | |
9215 | ||
2bc77e10 | 9216 | default: |
9217 | return t; | |
9218 | } /* switch (code) */ | |
9219 | } | |
76a0ced5 | 9220 | |
fc3df357 | 9221 | #ifdef ENABLE_FOLD_CHECKING |
9222 | #undef fold | |
9223 | ||
9224 | static void fold_checksum_tree (tree, struct md5_ctx *, htab_t); | |
9225 | static void fold_check_failed (tree, tree); | |
9226 | void print_fold_checksum (tree); | |
9227 | ||
9228 | /* When --enable-checking=fold, compute a digest of expr before | |
9229 | and after actual fold call to see if fold did not accidentally | |
9230 | change original expr. */ | |
9231 | ||
9232 | tree | |
9233 | fold (tree expr) | |
9234 | { | |
9235 | tree ret; | |
9236 | struct md5_ctx ctx; | |
9237 | unsigned char checksum_before[16], checksum_after[16]; | |
9238 | htab_t ht; | |
9239 | ||
9240 | ht = htab_create (32, htab_hash_pointer, htab_eq_pointer, NULL); | |
9241 | md5_init_ctx (&ctx); | |
9242 | fold_checksum_tree (expr, &ctx, ht); | |
9243 | md5_finish_ctx (&ctx, checksum_before); | |
9244 | htab_empty (ht); | |
9245 | ||
9246 | ret = fold_1 (expr); | |
9247 | ||
9248 | md5_init_ctx (&ctx); | |
9249 | fold_checksum_tree (expr, &ctx, ht); | |
9250 | md5_finish_ctx (&ctx, checksum_after); | |
9251 | htab_delete (ht); | |
9252 | ||
9253 | if (memcmp (checksum_before, checksum_after, 16)) | |
9254 | fold_check_failed (expr, ret); | |
9255 | ||
9256 | return ret; | |
9257 | } | |
9258 | ||
9259 | void | |
9260 | print_fold_checksum (tree expr) | |
9261 | { | |
9262 | struct md5_ctx ctx; | |
9263 | unsigned char checksum[16], cnt; | |
9264 | htab_t ht; | |
9265 | ||
9266 | ht = htab_create (32, htab_hash_pointer, htab_eq_pointer, NULL); | |
9267 | md5_init_ctx (&ctx); | |
9268 | fold_checksum_tree (expr, &ctx, ht); | |
9269 | md5_finish_ctx (&ctx, checksum); | |
9270 | htab_delete (ht); | |
9271 | for (cnt = 0; cnt < 16; ++cnt) | |
9272 | fprintf (stderr, "%02x", checksum[cnt]); | |
9273 | putc ('\n', stderr); | |
9274 | } | |
9275 | ||
9276 | static void | |
9277 | fold_check_failed (tree expr ATTRIBUTE_UNUSED, tree ret ATTRIBUTE_UNUSED) | |
9278 | { | |
9279 | internal_error ("fold check: original tree changed by fold"); | |
9280 | } | |
9281 | ||
9282 | static void | |
9283 | fold_checksum_tree (tree expr, struct md5_ctx *ctx, htab_t ht) | |
9284 | { | |
9285 | void **slot; | |
9286 | enum tree_code code; | |
9287 | char buf[sizeof (struct tree_decl)]; | |
9288 | int i, len; | |
9289 | ||
fdada98f | 9290 | gcc_assert ((sizeof (struct tree_exp) + 5 * sizeof (tree) |
9291 | <= sizeof (struct tree_decl)) | |
9292 | && sizeof (struct tree_type) <= sizeof (struct tree_decl)); | |
fc3df357 | 9293 | if (expr == NULL) |
9294 | return; | |
9295 | slot = htab_find_slot (ht, expr, INSERT); | |
9296 | if (*slot != NULL) | |
9297 | return; | |
9298 | *slot = expr; | |
9299 | code = TREE_CODE (expr); | |
ce45a448 | 9300 | if (TREE_CODE_CLASS (code) == tcc_declaration |
9301 | && DECL_ASSEMBLER_NAME_SET_P (expr)) | |
fc3df357 | 9302 | { |
9303 | /* Allow DECL_ASSEMBLER_NAME to be modified. */ | |
9304 | memcpy (buf, expr, tree_size (expr)); | |
9305 | expr = (tree) buf; | |
9306 | SET_DECL_ASSEMBLER_NAME (expr, NULL); | |
9307 | } | |
ce45a448 | 9308 | else if (TREE_CODE_CLASS (code) == tcc_type |
6b29892c | 9309 | && (TYPE_POINTER_TO (expr) || TYPE_REFERENCE_TO (expr) |
9310 | || TYPE_CACHED_VALUES_P (expr))) | |
fc3df357 | 9311 | { |
6b29892c | 9312 | /* Allow these fields to be modified. */ |
fc3df357 | 9313 | memcpy (buf, expr, tree_size (expr)); |
9314 | expr = (tree) buf; | |
9315 | TYPE_POINTER_TO (expr) = NULL; | |
9316 | TYPE_REFERENCE_TO (expr) = NULL; | |
6b29892c | 9317 | TYPE_CACHED_VALUES_P (expr) = 0; |
9318 | TYPE_CACHED_VALUES (expr) = NULL; | |
fc3df357 | 9319 | } |
9320 | md5_process_bytes (expr, tree_size (expr), ctx); | |
9321 | fold_checksum_tree (TREE_TYPE (expr), ctx, ht); | |
ce45a448 | 9322 | if (TREE_CODE_CLASS (code) != tcc_type |
9323 | && TREE_CODE_CLASS (code) != tcc_declaration) | |
fc3df357 | 9324 | fold_checksum_tree (TREE_CHAIN (expr), ctx, ht); |
fc3df357 | 9325 | switch (TREE_CODE_CLASS (code)) |
9326 | { | |
ce45a448 | 9327 | case tcc_constant: |
fc3df357 | 9328 | switch (code) |
9329 | { | |
9330 | case STRING_CST: | |
9331 | md5_process_bytes (TREE_STRING_POINTER (expr), | |
9332 | TREE_STRING_LENGTH (expr), ctx); | |
9333 | break; | |
9334 | case COMPLEX_CST: | |
9335 | fold_checksum_tree (TREE_REALPART (expr), ctx, ht); | |
9336 | fold_checksum_tree (TREE_IMAGPART (expr), ctx, ht); | |
9337 | break; | |
9338 | case VECTOR_CST: | |
9339 | fold_checksum_tree (TREE_VECTOR_CST_ELTS (expr), ctx, ht); | |
9340 | break; | |
9341 | default: | |
9342 | break; | |
9343 | } | |
9344 | break; | |
ce45a448 | 9345 | case tcc_exceptional: |
fc3df357 | 9346 | switch (code) |
9347 | { | |
9348 | case TREE_LIST: | |
9349 | fold_checksum_tree (TREE_PURPOSE (expr), ctx, ht); | |
9350 | fold_checksum_tree (TREE_VALUE (expr), ctx, ht); | |
9351 | break; | |
9352 | case TREE_VEC: | |
9353 | for (i = 0; i < TREE_VEC_LENGTH (expr); ++i) | |
9354 | fold_checksum_tree (TREE_VEC_ELT (expr, i), ctx, ht); | |
9355 | break; | |
9356 | default: | |
9357 | break; | |
9358 | } | |
9359 | break; | |
ce45a448 | 9360 | case tcc_expression: |
9361 | case tcc_reference: | |
9362 | case tcc_comparison: | |
9363 | case tcc_unary: | |
9364 | case tcc_binary: | |
9365 | case tcc_statement: | |
6388f9f7 | 9366 | len = first_rtl_op (code); |
fc3df357 | 9367 | for (i = 0; i < len; ++i) |
9368 | fold_checksum_tree (TREE_OPERAND (expr, i), ctx, ht); | |
9369 | break; | |
ce45a448 | 9370 | case tcc_declaration: |
fc3df357 | 9371 | fold_checksum_tree (DECL_SIZE (expr), ctx, ht); |
9372 | fold_checksum_tree (DECL_SIZE_UNIT (expr), ctx, ht); | |
9373 | fold_checksum_tree (DECL_NAME (expr), ctx, ht); | |
9374 | fold_checksum_tree (DECL_CONTEXT (expr), ctx, ht); | |
9375 | fold_checksum_tree (DECL_ARGUMENTS (expr), ctx, ht); | |
9376 | fold_checksum_tree (DECL_RESULT_FLD (expr), ctx, ht); | |
9377 | fold_checksum_tree (DECL_INITIAL (expr), ctx, ht); | |
9378 | fold_checksum_tree (DECL_ABSTRACT_ORIGIN (expr), ctx, ht); | |
9379 | fold_checksum_tree (DECL_SECTION_NAME (expr), ctx, ht); | |
9380 | fold_checksum_tree (DECL_ATTRIBUTES (expr), ctx, ht); | |
9381 | fold_checksum_tree (DECL_VINDEX (expr), ctx, ht); | |
9382 | break; | |
ce45a448 | 9383 | case tcc_type: |
419ec660 | 9384 | if (TREE_CODE (expr) == ENUMERAL_TYPE) |
9385 | fold_checksum_tree (TYPE_VALUES (expr), ctx, ht); | |
fc3df357 | 9386 | fold_checksum_tree (TYPE_SIZE (expr), ctx, ht); |
9387 | fold_checksum_tree (TYPE_SIZE_UNIT (expr), ctx, ht); | |
9388 | fold_checksum_tree (TYPE_ATTRIBUTES (expr), ctx, ht); | |
9389 | fold_checksum_tree (TYPE_NAME (expr), ctx, ht); | |
419ec660 | 9390 | if (INTEGRAL_TYPE_P (expr) |
9391 | || SCALAR_FLOAT_TYPE_P (expr)) | |
9392 | { | |
9393 | fold_checksum_tree (TYPE_MIN_VALUE (expr), ctx, ht); | |
9394 | fold_checksum_tree (TYPE_MAX_VALUE (expr), ctx, ht); | |
9395 | } | |
fc3df357 | 9396 | fold_checksum_tree (TYPE_MAIN_VARIANT (expr), ctx, ht); |
6b29892c | 9397 | if (TREE_CODE (expr) == RECORD_TYPE |
9398 | || TREE_CODE (expr) == UNION_TYPE | |
9399 | || TREE_CODE (expr) == QUAL_UNION_TYPE) | |
9400 | fold_checksum_tree (TYPE_BINFO (expr), ctx, ht); | |
fc3df357 | 9401 | fold_checksum_tree (TYPE_CONTEXT (expr), ctx, ht); |
9402 | break; | |
9403 | default: | |
9404 | break; | |
9405 | } | |
9406 | } | |
9407 | ||
9408 | #endif | |
9409 | ||
91c82c20 | 9410 | /* Perform constant folding and related simplification of initializer |
276beea2 | 9411 | expression EXPR. This behaves identically to "fold" but ignores |
9412 | potential run-time traps and exceptions that fold must preserve. */ | |
9413 | ||
9414 | tree | |
9415 | fold_initializer (tree expr) | |
9416 | { | |
9417 | int saved_signaling_nans = flag_signaling_nans; | |
9418 | int saved_trapping_math = flag_trapping_math; | |
9419 | int saved_trapv = flag_trapv; | |
9420 | tree result; | |
9421 | ||
9422 | flag_signaling_nans = 0; | |
9423 | flag_trapping_math = 0; | |
9424 | flag_trapv = 0; | |
9425 | ||
9426 | result = fold (expr); | |
9427 | ||
9428 | flag_signaling_nans = saved_signaling_nans; | |
9429 | flag_trapping_math = saved_trapping_math; | |
9430 | flag_trapv = saved_trapv; | |
9431 | ||
9432 | return result; | |
9433 | } | |
9434 | ||
7014838c | 9435 | /* Determine if first argument is a multiple of second argument. Return 0 if |
9436 | it is not, or we cannot easily determined it to be. | |
76a0ced5 | 9437 | |
7014838c | 9438 | An example of the sort of thing we care about (at this point; this routine |
9439 | could surely be made more general, and expanded to do what the *_DIV_EXPR's | |
9440 | fold cases do now) is discovering that | |
76a0ced5 | 9441 | |
9442 | SAVE_EXPR (I) * SAVE_EXPR (J * 8) | |
9443 | ||
9444 | is a multiple of | |
9445 | ||
9446 | SAVE_EXPR (J * 8) | |
9447 | ||
7014838c | 9448 | when we know that the two SAVE_EXPR (J * 8) nodes are the same node. |
76a0ced5 | 9449 | |
9450 | This code also handles discovering that | |
9451 | ||
9452 | SAVE_EXPR (I) * SAVE_EXPR (J * 8) | |
9453 | ||
7014838c | 9454 | is a multiple of 8 so we don't have to worry about dealing with a |
76a0ced5 | 9455 | possible remainder. |
9456 | ||
7014838c | 9457 | Note that we *look* inside a SAVE_EXPR only to determine how it was |
9458 | calculated; it is not safe for fold to do much of anything else with the | |
9459 | internals of a SAVE_EXPR, since it cannot know when it will be evaluated | |
9460 | at run time. For example, the latter example above *cannot* be implemented | |
9461 | as SAVE_EXPR (I) * J or any variant thereof, since the value of J at | |
9462 | evaluation time of the original SAVE_EXPR is not necessarily the same at | |
9463 | the time the new expression is evaluated. The only optimization of this | |
76a0ced5 | 9464 | sort that would be valid is changing |
9465 | ||
9466 | SAVE_EXPR (I) * SAVE_EXPR (SAVE_EXPR (J) * 8) | |
76a0ced5 | 9467 | |
7014838c | 9468 | divided by 8 to |
76a0ced5 | 9469 | |
9470 | SAVE_EXPR (I) * SAVE_EXPR (J) | |
9471 | ||
9472 | (where the same SAVE_EXPR (J) is used in the original and the | |
9473 | transformed version). */ | |
9474 | ||
9475 | static int | |
de1b648b | 9476 | multiple_of_p (tree type, tree top, tree bottom) |
76a0ced5 | 9477 | { |
9478 | if (operand_equal_p (top, bottom, 0)) | |
9479 | return 1; | |
9480 | ||
9481 | if (TREE_CODE (type) != INTEGER_TYPE) | |
9482 | return 0; | |
9483 | ||
9484 | switch (TREE_CODE (top)) | |
9485 | { | |
9486 | case MULT_EXPR: | |
9487 | return (multiple_of_p (type, TREE_OPERAND (top, 0), bottom) | |
9488 | || multiple_of_p (type, TREE_OPERAND (top, 1), bottom)); | |
9489 | ||
9490 | case PLUS_EXPR: | |
9491 | case MINUS_EXPR: | |
9492 | return (multiple_of_p (type, TREE_OPERAND (top, 0), bottom) | |
9493 | && multiple_of_p (type, TREE_OPERAND (top, 1), bottom)); | |
9494 | ||
17e3940f | 9495 | case LSHIFT_EXPR: |
9496 | if (TREE_CODE (TREE_OPERAND (top, 1)) == INTEGER_CST) | |
9497 | { | |
9498 | tree op1, t1; | |
9499 | ||
9500 | op1 = TREE_OPERAND (top, 1); | |
9501 | /* const_binop may not detect overflow correctly, | |
9502 | so check for it explicitly here. */ | |
9503 | if (TYPE_PRECISION (TREE_TYPE (size_one_node)) | |
9504 | > TREE_INT_CST_LOW (op1) | |
9505 | && TREE_INT_CST_HIGH (op1) == 0 | |
b30e3dbc | 9506 | && 0 != (t1 = fold_convert (type, |
9507 | const_binop (LSHIFT_EXPR, | |
9508 | size_one_node, | |
9509 | op1, 0))) | |
17e3940f | 9510 | && ! TREE_OVERFLOW (t1)) |
9511 | return multiple_of_p (type, t1, bottom); | |
9512 | } | |
9513 | return 0; | |
9514 | ||
76a0ced5 | 9515 | case NOP_EXPR: |
7014838c | 9516 | /* Can't handle conversions from non-integral or wider integral type. */ |
76a0ced5 | 9517 | if ((TREE_CODE (TREE_TYPE (TREE_OPERAND (top, 0))) != INTEGER_TYPE) |
9518 | || (TYPE_PRECISION (type) | |
9519 | < TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (top, 0))))) | |
9520 | return 0; | |
7014838c | 9521 | |
6312a35e | 9522 | /* .. fall through ... */ |
7014838c | 9523 | |
76a0ced5 | 9524 | case SAVE_EXPR: |
9525 | return multiple_of_p (type, TREE_OPERAND (top, 0), bottom); | |
9526 | ||
9527 | case INTEGER_CST: | |
17e3940f | 9528 | if (TREE_CODE (bottom) != INTEGER_CST |
78a8ed03 | 9529 | || (TYPE_UNSIGNED (type) |
17e3940f | 9530 | && (tree_int_cst_sgn (top) < 0 |
9531 | || tree_int_cst_sgn (bottom) < 0))) | |
76a0ced5 | 9532 | return 0; |
9533 | return integer_zerop (const_binop (TRUNC_MOD_EXPR, | |
9534 | top, bottom, 0)); | |
9535 | ||
9536 | default: | |
9537 | return 0; | |
9538 | } | |
9539 | } | |
0f221fb7 | 9540 | |
9541 | /* Return true if `t' is known to be non-negative. */ | |
9542 | ||
9543 | int | |
de1b648b | 9544 | tree_expr_nonnegative_p (tree t) |
0f221fb7 | 9545 | { |
9546 | switch (TREE_CODE (t)) | |
9547 | { | |
cde9d0c7 | 9548 | case ABS_EXPR: |
cde9d0c7 | 9549 | return 1; |
8f4be2be | 9550 | |
0f221fb7 | 9551 | case INTEGER_CST: |
9552 | return tree_int_cst_sgn (t) >= 0; | |
cfb7235b | 9553 | |
9554 | case REAL_CST: | |
9555 | return ! REAL_VALUE_NEGATIVE (TREE_REAL_CST (t)); | |
9556 | ||
9557 | case PLUS_EXPR: | |
ae98dc4b | 9558 | if (FLOAT_TYPE_P (TREE_TYPE (t))) |
9559 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)) | |
9560 | && tree_expr_nonnegative_p (TREE_OPERAND (t, 1)); | |
9561 | ||
dfcd8f35 | 9562 | /* zero_extend(x) + zero_extend(y) is non-negative if x and y are |
2b8ef647 | 9563 | both unsigned and at least 2 bits shorter than the result. */ |
ae98dc4b | 9564 | if (TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE |
9565 | && TREE_CODE (TREE_OPERAND (t, 0)) == NOP_EXPR | |
9566 | && TREE_CODE (TREE_OPERAND (t, 1)) == NOP_EXPR) | |
9567 | { | |
9568 | tree inner1 = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (t, 0), 0)); | |
9569 | tree inner2 = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (t, 1), 0)); | |
78a8ed03 | 9570 | if (TREE_CODE (inner1) == INTEGER_TYPE && TYPE_UNSIGNED (inner1) |
9571 | && TREE_CODE (inner2) == INTEGER_TYPE && TYPE_UNSIGNED (inner2)) | |
ae98dc4b | 9572 | { |
9573 | unsigned int prec = MAX (TYPE_PRECISION (inner1), | |
9574 | TYPE_PRECISION (inner2)) + 1; | |
9575 | return prec < TYPE_PRECISION (TREE_TYPE (t)); | |
9576 | } | |
9577 | } | |
9578 | break; | |
cfb7235b | 9579 | |
9580 | case MULT_EXPR: | |
9581 | if (FLOAT_TYPE_P (TREE_TYPE (t))) | |
9582 | { | |
9583 | /* x * x for floating point x is always non-negative. */ | |
9584 | if (operand_equal_p (TREE_OPERAND (t, 0), TREE_OPERAND (t, 1), 0)) | |
9585 | return 1; | |
9586 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)) | |
9587 | && tree_expr_nonnegative_p (TREE_OPERAND (t, 1)); | |
9588 | } | |
ae98dc4b | 9589 | |
dfcd8f35 | 9590 | /* zero_extend(x) * zero_extend(y) is non-negative if x and y are |
ae98dc4b | 9591 | both unsigned and their total bits is shorter than the result. */ |
9592 | if (TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE | |
9593 | && TREE_CODE (TREE_OPERAND (t, 0)) == NOP_EXPR | |
9594 | && TREE_CODE (TREE_OPERAND (t, 1)) == NOP_EXPR) | |
9595 | { | |
9596 | tree inner1 = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (t, 0), 0)); | |
9597 | tree inner2 = TREE_TYPE (TREE_OPERAND (TREE_OPERAND (t, 1), 0)); | |
78a8ed03 | 9598 | if (TREE_CODE (inner1) == INTEGER_TYPE && TYPE_UNSIGNED (inner1) |
9599 | && TREE_CODE (inner2) == INTEGER_TYPE && TYPE_UNSIGNED (inner2)) | |
ae98dc4b | 9600 | return TYPE_PRECISION (inner1) + TYPE_PRECISION (inner2) |
9601 | < TYPE_PRECISION (TREE_TYPE (t)); | |
9602 | } | |
cfb7235b | 9603 | return 0; |
9604 | ||
a9436f5c | 9605 | case TRUNC_DIV_EXPR: |
9606 | case CEIL_DIV_EXPR: | |
9607 | case FLOOR_DIV_EXPR: | |
9608 | case ROUND_DIV_EXPR: | |
9609 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)) | |
ae98dc4b | 9610 | && tree_expr_nonnegative_p (TREE_OPERAND (t, 1)); |
9611 | ||
a9436f5c | 9612 | case TRUNC_MOD_EXPR: |
9613 | case CEIL_MOD_EXPR: | |
9614 | case FLOOR_MOD_EXPR: | |
9615 | case ROUND_MOD_EXPR: | |
9616 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)); | |
ae98dc4b | 9617 | |
9618 | case RDIV_EXPR: | |
9619 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)) | |
9620 | && tree_expr_nonnegative_p (TREE_OPERAND (t, 1)); | |
9621 | ||
44c9fd6a | 9622 | case BIT_AND_EXPR: |
9623 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 1)) | |
9624 | || tree_expr_nonnegative_p (TREE_OPERAND (t, 0)); | |
9625 | case BIT_IOR_EXPR: | |
76c22522 | 9626 | case BIT_XOR_EXPR: |
44c9fd6a | 9627 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)) |
9628 | && tree_expr_nonnegative_p (TREE_OPERAND (t, 1)); | |
9629 | ||
ae98dc4b | 9630 | case NOP_EXPR: |
9631 | { | |
9632 | tree inner_type = TREE_TYPE (TREE_OPERAND (t, 0)); | |
9633 | tree outer_type = TREE_TYPE (t); | |
9634 | ||
9635 | if (TREE_CODE (outer_type) == REAL_TYPE) | |
9636 | { | |
9637 | if (TREE_CODE (inner_type) == REAL_TYPE) | |
9638 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)); | |
9639 | if (TREE_CODE (inner_type) == INTEGER_TYPE) | |
9640 | { | |
78a8ed03 | 9641 | if (TYPE_UNSIGNED (inner_type)) |
ae98dc4b | 9642 | return 1; |
9643 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)); | |
9644 | } | |
9645 | } | |
9646 | else if (TREE_CODE (outer_type) == INTEGER_TYPE) | |
9647 | { | |
9648 | if (TREE_CODE (inner_type) == REAL_TYPE) | |
9649 | return tree_expr_nonnegative_p (TREE_OPERAND (t,0)); | |
9650 | if (TREE_CODE (inner_type) == INTEGER_TYPE) | |
9651 | return TYPE_PRECISION (inner_type) < TYPE_PRECISION (outer_type) | |
78a8ed03 | 9652 | && TYPE_UNSIGNED (inner_type); |
ae98dc4b | 9653 | } |
9654 | } | |
9655 | break; | |
9656 | ||
0f221fb7 | 9657 | case COND_EXPR: |
9658 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 1)) | |
9659 | && tree_expr_nonnegative_p (TREE_OPERAND (t, 2)); | |
cde9d0c7 | 9660 | case COMPOUND_EXPR: |
9661 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 1)); | |
9662 | case MIN_EXPR: | |
9663 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)) | |
d3371fcd | 9664 | && tree_expr_nonnegative_p (TREE_OPERAND (t, 1)); |
cde9d0c7 | 9665 | case MAX_EXPR: |
9666 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)) | |
d3371fcd | 9667 | || tree_expr_nonnegative_p (TREE_OPERAND (t, 1)); |
cde9d0c7 | 9668 | case MODIFY_EXPR: |
9669 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 1)); | |
0f221fb7 | 9670 | case BIND_EXPR: |
2363ef00 | 9671 | return tree_expr_nonnegative_p (expr_last (TREE_OPERAND (t, 1))); |
a9436f5c | 9672 | case SAVE_EXPR: |
9673 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)); | |
9674 | case NON_LVALUE_EXPR: | |
9675 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)); | |
277f8dd2 | 9676 | case FLOAT_EXPR: |
9677 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)); | |
d3371fcd | 9678 | |
2569a1be | 9679 | case TARGET_EXPR: |
9680 | { | |
9681 | tree temp = TARGET_EXPR_SLOT (t); | |
9682 | t = TARGET_EXPR_INITIAL (t); | |
9683 | ||
9684 | /* If the initializer is non-void, then it's a normal expression | |
9685 | that will be assigned to the slot. */ | |
9686 | if (!VOID_TYPE_P (t)) | |
9687 | return tree_expr_nonnegative_p (t); | |
9688 | ||
9689 | /* Otherwise, the initializer sets the slot in some way. One common | |
9690 | way is an assignment statement at the end of the initializer. */ | |
9691 | while (1) | |
9692 | { | |
9693 | if (TREE_CODE (t) == BIND_EXPR) | |
9694 | t = expr_last (BIND_EXPR_BODY (t)); | |
9695 | else if (TREE_CODE (t) == TRY_FINALLY_EXPR | |
9696 | || TREE_CODE (t) == TRY_CATCH_EXPR) | |
9697 | t = expr_last (TREE_OPERAND (t, 0)); | |
9698 | else if (TREE_CODE (t) == STATEMENT_LIST) | |
9699 | t = expr_last (t); | |
9700 | else | |
9701 | break; | |
9702 | } | |
9703 | if (TREE_CODE (t) == MODIFY_EXPR | |
9704 | && TREE_OPERAND (t, 0) == temp) | |
9705 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 1)); | |
9706 | ||
9707 | return 0; | |
9708 | } | |
9709 | ||
c63f4ad3 | 9710 | case CALL_EXPR: |
c6e6ecb1 | 9711 | { |
9712 | tree fndecl = get_callee_fndecl (t); | |
9713 | tree arglist = TREE_OPERAND (t, 1); | |
9714 | if (fndecl | |
9715 | && DECL_BUILT_IN (fndecl) | |
9716 | && DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_MD) | |
9717 | switch (DECL_FUNCTION_CODE (fndecl)) | |
9718 | { | |
2df2df75 | 9719 | #define CASE_BUILTIN_F(BUILT_IN_FN) \ |
9720 | case BUILT_IN_FN: case BUILT_IN_FN##F: case BUILT_IN_FN##L: | |
9721 | #define CASE_BUILTIN_I(BUILT_IN_FN) \ | |
9722 | case BUILT_IN_FN: case BUILT_IN_FN##L: case BUILT_IN_FN##LL: | |
9723 | ||
e63e0041 | 9724 | CASE_BUILTIN_F (BUILT_IN_ACOS) |
9725 | CASE_BUILTIN_F (BUILT_IN_ACOSH) | |
2df2df75 | 9726 | CASE_BUILTIN_F (BUILT_IN_CABS) |
e63e0041 | 9727 | CASE_BUILTIN_F (BUILT_IN_COSH) |
9728 | CASE_BUILTIN_F (BUILT_IN_ERFC) | |
2df2df75 | 9729 | CASE_BUILTIN_F (BUILT_IN_EXP) |
9730 | CASE_BUILTIN_F (BUILT_IN_EXP10) | |
9731 | CASE_BUILTIN_F (BUILT_IN_EXP2) | |
9732 | CASE_BUILTIN_F (BUILT_IN_FABS) | |
e63e0041 | 9733 | CASE_BUILTIN_F (BUILT_IN_FDIM) |
9734 | CASE_BUILTIN_F (BUILT_IN_FREXP) | |
9735 | CASE_BUILTIN_F (BUILT_IN_HYPOT) | |
2df2df75 | 9736 | CASE_BUILTIN_F (BUILT_IN_POW10) |
2df2df75 | 9737 | CASE_BUILTIN_I (BUILT_IN_FFS) |
9738 | CASE_BUILTIN_I (BUILT_IN_PARITY) | |
9739 | CASE_BUILTIN_I (BUILT_IN_POPCOUNT) | |
e63e0041 | 9740 | /* Always true. */ |
c6e6ecb1 | 9741 | return 1; |
9742 | ||
467214fd | 9743 | CASE_BUILTIN_F (BUILT_IN_SQRT) |
9744 | /* sqrt(-0.0) is -0.0. */ | |
9745 | if (!HONOR_SIGNED_ZEROS (TYPE_MODE (TREE_TYPE (t)))) | |
9746 | return 1; | |
9747 | return tree_expr_nonnegative_p (TREE_VALUE (arglist)); | |
9748 | ||
e63e0041 | 9749 | CASE_BUILTIN_F (BUILT_IN_ASINH) |
2df2df75 | 9750 | CASE_BUILTIN_F (BUILT_IN_ATAN) |
e63e0041 | 9751 | CASE_BUILTIN_F (BUILT_IN_ATANH) |
9752 | CASE_BUILTIN_F (BUILT_IN_CBRT) | |
2df2df75 | 9753 | CASE_BUILTIN_F (BUILT_IN_CEIL) |
e63e0041 | 9754 | CASE_BUILTIN_F (BUILT_IN_ERF) |
9755 | CASE_BUILTIN_F (BUILT_IN_EXPM1) | |
2df2df75 | 9756 | CASE_BUILTIN_F (BUILT_IN_FLOOR) |
e63e0041 | 9757 | CASE_BUILTIN_F (BUILT_IN_FMOD) |
9758 | CASE_BUILTIN_F (BUILT_IN_LDEXP) | |
9759 | CASE_BUILTIN_F (BUILT_IN_LLRINT) | |
9760 | CASE_BUILTIN_F (BUILT_IN_LLROUND) | |
9761 | CASE_BUILTIN_F (BUILT_IN_LRINT) | |
9762 | CASE_BUILTIN_F (BUILT_IN_LROUND) | |
9763 | CASE_BUILTIN_F (BUILT_IN_MODF) | |
2df2df75 | 9764 | CASE_BUILTIN_F (BUILT_IN_NEARBYINT) |
9765 | CASE_BUILTIN_F (BUILT_IN_POW) | |
e63e0041 | 9766 | CASE_BUILTIN_F (BUILT_IN_RINT) |
2df2df75 | 9767 | CASE_BUILTIN_F (BUILT_IN_ROUND) |
e63e0041 | 9768 | CASE_BUILTIN_F (BUILT_IN_SIGNBIT) |
9769 | CASE_BUILTIN_F (BUILT_IN_SINH) | |
9770 | CASE_BUILTIN_F (BUILT_IN_TANH) | |
2df2df75 | 9771 | CASE_BUILTIN_F (BUILT_IN_TRUNC) |
e63e0041 | 9772 | /* True if the 1st argument is nonnegative. */ |
c6e6ecb1 | 9773 | return tree_expr_nonnegative_p (TREE_VALUE (arglist)); |
c63f4ad3 | 9774 | |
467214fd | 9775 | CASE_BUILTIN_F (BUILT_IN_FMAX) |
e63e0041 | 9776 | /* True if the 1st OR 2nd arguments are nonnegative. */ |
9777 | return tree_expr_nonnegative_p (TREE_VALUE (arglist)) | |
9778 | || tree_expr_nonnegative_p (TREE_VALUE (TREE_CHAIN (arglist))); | |
9779 | ||
467214fd | 9780 | CASE_BUILTIN_F (BUILT_IN_FMIN) |
e63e0041 | 9781 | /* True if the 1st AND 2nd arguments are nonnegative. */ |
9782 | return tree_expr_nonnegative_p (TREE_VALUE (arglist)) | |
9783 | && tree_expr_nonnegative_p (TREE_VALUE (TREE_CHAIN (arglist))); | |
9784 | ||
467214fd | 9785 | CASE_BUILTIN_F (BUILT_IN_COPYSIGN) |
e63e0041 | 9786 | /* True if the 2nd argument is nonnegative. */ |
9787 | return tree_expr_nonnegative_p (TREE_VALUE (TREE_CHAIN (arglist))); | |
9788 | ||
c6e6ecb1 | 9789 | default: |
9790 | break; | |
2df2df75 | 9791 | #undef CASE_BUILTIN_F |
9792 | #undef CASE_BUILTIN_I | |
c6e6ecb1 | 9793 | } |
9794 | } | |
c63f4ad3 | 9795 | |
6473f3f4 | 9796 | /* ... fall through ... */ |
c63f4ad3 | 9797 | |
0f221fb7 | 9798 | default: |
88e6440b | 9799 | if (truth_value_p (TREE_CODE (t))) |
9800 | /* Truth values evaluate to 0 or 1, which is nonnegative. */ | |
9801 | return 1; | |
0f221fb7 | 9802 | } |
ae98dc4b | 9803 | |
9804 | /* We don't know sign of `t', so be conservative and return false. */ | |
9805 | return 0; | |
0f221fb7 | 9806 | } |
9807 | ||
ad46984d | 9808 | /* Return true when T is an address and is known to be nonzero. |
9809 | For floating point we further ensure that T is not denormal. | |
778ac06a | 9810 | Similar logic is present in nonzero_address in rtlanal.h. */ |
ad46984d | 9811 | |
9812 | static bool | |
9813 | tree_expr_nonzero_p (tree t) | |
9814 | { | |
9815 | tree type = TREE_TYPE (t); | |
9816 | ||
7bd28bba | 9817 | /* Doing something useful for floating point would need more work. */ |
ad46984d | 9818 | if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type)) |
9819 | return false; | |
9820 | ||
9821 | switch (TREE_CODE (t)) | |
9822 | { | |
9823 | case ABS_EXPR: | |
78a8ed03 | 9824 | if (!TYPE_UNSIGNED (type) && !flag_wrapv) |
ad46984d | 9825 | return tree_expr_nonzero_p (TREE_OPERAND (t, 0)); |
9826 | ||
9827 | case INTEGER_CST: | |
bb445479 | 9828 | /* We used to test for !integer_zerop here. This does not work correctly |
9829 | if TREE_CONSTANT_OVERFLOW (t). */ | |
9830 | return (TREE_INT_CST_LOW (t) != 0 | |
9831 | || TREE_INT_CST_HIGH (t) != 0); | |
ad46984d | 9832 | |
9833 | case PLUS_EXPR: | |
78a8ed03 | 9834 | if (!TYPE_UNSIGNED (type) && !flag_wrapv) |
ad46984d | 9835 | { |
9836 | /* With the presence of negative values it is hard | |
9837 | to say something. */ | |
9838 | if (!tree_expr_nonnegative_p (TREE_OPERAND (t, 0)) | |
9839 | || !tree_expr_nonnegative_p (TREE_OPERAND (t, 1))) | |
9840 | return false; | |
9841 | /* One of operands must be positive and the other non-negative. */ | |
9842 | return (tree_expr_nonzero_p (TREE_OPERAND (t, 0)) | |
9843 | || tree_expr_nonzero_p (TREE_OPERAND (t, 1))); | |
9844 | } | |
9845 | break; | |
9846 | ||
9847 | case MULT_EXPR: | |
78a8ed03 | 9848 | if (!TYPE_UNSIGNED (type) && !flag_wrapv) |
ad46984d | 9849 | { |
9850 | return (tree_expr_nonzero_p (TREE_OPERAND (t, 0)) | |
9851 | && tree_expr_nonzero_p (TREE_OPERAND (t, 1))); | |
9852 | } | |
9853 | break; | |
9854 | ||
9855 | case NOP_EXPR: | |
9856 | { | |
9857 | tree inner_type = TREE_TYPE (TREE_OPERAND (t, 0)); | |
9858 | tree outer_type = TREE_TYPE (t); | |
9859 | ||
9860 | return (TYPE_PRECISION (inner_type) >= TYPE_PRECISION (outer_type) | |
9861 | && tree_expr_nonzero_p (TREE_OPERAND (t, 0))); | |
9862 | } | |
9863 | break; | |
9864 | ||
9865 | case ADDR_EXPR: | |
3d1c55e6 | 9866 | { |
9867 | tree base = get_base_address (TREE_OPERAND (t, 0)); | |
9868 | ||
9869 | if (!base) | |
9870 | return false; | |
9871 | ||
9872 | /* Weak declarations may link to NULL. */ | |
9873 | if (DECL_P (base)) | |
9874 | return !DECL_WEAK (base); | |
9875 | ||
9876 | /* Constants are never weak. */ | |
ce45a448 | 9877 | if (CONSTANT_CLASS_P (base)) |
3d1c55e6 | 9878 | return true; |
9879 | ||
9880 | return false; | |
9881 | } | |
ad46984d | 9882 | |
9883 | case COND_EXPR: | |
9884 | return (tree_expr_nonzero_p (TREE_OPERAND (t, 1)) | |
9885 | && tree_expr_nonzero_p (TREE_OPERAND (t, 2))); | |
9886 | ||
9887 | case MIN_EXPR: | |
9888 | return (tree_expr_nonzero_p (TREE_OPERAND (t, 0)) | |
9889 | && tree_expr_nonzero_p (TREE_OPERAND (t, 1))); | |
9890 | ||
9891 | case MAX_EXPR: | |
9892 | if (tree_expr_nonzero_p (TREE_OPERAND (t, 0))) | |
9893 | { | |
9894 | /* When both operands are nonzero, then MAX must be too. */ | |
9895 | if (tree_expr_nonzero_p (TREE_OPERAND (t, 1))) | |
9896 | return true; | |
9897 | ||
9898 | /* MAX where operand 0 is positive is positive. */ | |
9899 | return tree_expr_nonnegative_p (TREE_OPERAND (t, 0)); | |
9900 | } | |
9901 | /* MAX where operand 1 is positive is positive. */ | |
9902 | else if (tree_expr_nonzero_p (TREE_OPERAND (t, 1)) | |
9903 | && tree_expr_nonnegative_p (TREE_OPERAND (t, 1))) | |
9904 | return true; | |
9905 | break; | |
9906 | ||
9907 | case COMPOUND_EXPR: | |
9908 | case MODIFY_EXPR: | |
9909 | case BIND_EXPR: | |
9910 | return tree_expr_nonzero_p (TREE_OPERAND (t, 1)); | |
9911 | ||
9912 | case SAVE_EXPR: | |
9913 | case NON_LVALUE_EXPR: | |
9914 | return tree_expr_nonzero_p (TREE_OPERAND (t, 0)); | |
9915 | ||
44c9fd6a | 9916 | case BIT_IOR_EXPR: |
9917 | return tree_expr_nonzero_p (TREE_OPERAND (t, 1)) | |
9918 | || tree_expr_nonzero_p (TREE_OPERAND (t, 0)); | |
9919 | ||
ad46984d | 9920 | default: |
9921 | break; | |
9922 | } | |
9923 | return false; | |
9924 | } | |
9925 | ||
4ee9c684 | 9926 | /* See if we are applying CODE, a relational to the highest or lowest |
9927 | possible integer of TYPE. If so, then the result is a compile | |
9928 | time constant. */ | |
9929 | ||
9930 | static tree | |
9931 | fold_relational_hi_lo (enum tree_code *code_p, const tree type, tree *op0_p, | |
9932 | tree *op1_p) | |
9933 | { | |
9934 | tree op0 = *op0_p; | |
9935 | tree op1 = *op1_p; | |
9936 | enum tree_code code = *code_p; | |
9937 | int width = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (op1))); | |
9938 | ||
9939 | if (TREE_CODE (op1) == INTEGER_CST | |
9940 | && ! TREE_CONSTANT_OVERFLOW (op1) | |
9941 | && width <= HOST_BITS_PER_WIDE_INT | |
9942 | && (INTEGRAL_TYPE_P (TREE_TYPE (op1)) | |
9943 | || POINTER_TYPE_P (TREE_TYPE (op1)))) | |
9944 | { | |
9945 | unsigned HOST_WIDE_INT signed_max; | |
9946 | unsigned HOST_WIDE_INT max, min; | |
9947 | ||
9948 | signed_max = ((unsigned HOST_WIDE_INT) 1 << (width - 1)) - 1; | |
9949 | ||
9950 | if (TYPE_UNSIGNED (TREE_TYPE (op1))) | |
9951 | { | |
9952 | max = ((unsigned HOST_WIDE_INT) 2 << (width - 1)) - 1; | |
9953 | min = 0; | |
9954 | } | |
9955 | else | |
9956 | { | |
9957 | max = signed_max; | |
9958 | min = ((unsigned HOST_WIDE_INT) -1 << (width - 1)); | |
9959 | } | |
9960 | ||
9961 | if (TREE_INT_CST_HIGH (op1) == 0 | |
9962 | && TREE_INT_CST_LOW (op1) == max) | |
9963 | switch (code) | |
9964 | { | |
9965 | case GT_EXPR: | |
20783f07 | 9966 | return omit_one_operand (type, integer_zero_node, op0); |
9967 | ||
4ee9c684 | 9968 | case GE_EXPR: |
9969 | *code_p = EQ_EXPR; | |
9970 | break; | |
9971 | case LE_EXPR: | |
20783f07 | 9972 | return omit_one_operand (type, integer_one_node, op0); |
9973 | ||
4ee9c684 | 9974 | case LT_EXPR: |
9975 | *code_p = NE_EXPR; | |
9976 | break; | |
9977 | ||
9978 | /* The GE_EXPR and LT_EXPR cases above are not normally | |
9979 | reached because of previous transformations. */ | |
9980 | ||
9981 | default: | |
9982 | break; | |
9983 | } | |
9984 | else if (TREE_INT_CST_HIGH (op1) == 0 | |
9985 | && TREE_INT_CST_LOW (op1) == max - 1) | |
9986 | switch (code) | |
9987 | { | |
9988 | case GT_EXPR: | |
9989 | *code_p = EQ_EXPR; | |
9990 | *op1_p = const_binop (PLUS_EXPR, op1, integer_one_node, 0); | |
9991 | break; | |
9992 | case LE_EXPR: | |
9993 | *code_p = NE_EXPR; | |
9994 | *op1_p = const_binop (PLUS_EXPR, op1, integer_one_node, 0); | |
9995 | break; | |
9996 | default: | |
9997 | break; | |
9998 | } | |
9999 | else if (TREE_INT_CST_HIGH (op1) == (min ? -1 : 0) | |
10000 | && TREE_INT_CST_LOW (op1) == min) | |
10001 | switch (code) | |
10002 | { | |
10003 | case LT_EXPR: | |
20783f07 | 10004 | return omit_one_operand (type, integer_zero_node, op0); |
10005 | ||
4ee9c684 | 10006 | case LE_EXPR: |
10007 | *code_p = EQ_EXPR; | |
10008 | break; | |
10009 | ||
10010 | case GE_EXPR: | |
20783f07 | 10011 | return omit_one_operand (type, integer_one_node, op0); |
10012 | ||
4ee9c684 | 10013 | case GT_EXPR: |
10014 | *code_p = NE_EXPR; | |
10015 | break; | |
10016 | ||
10017 | default: | |
10018 | break; | |
10019 | } | |
10020 | else if (TREE_INT_CST_HIGH (op1) == (min ? -1 : 0) | |
10021 | && TREE_INT_CST_LOW (op1) == min + 1) | |
10022 | switch (code) | |
10023 | { | |
10024 | case GE_EXPR: | |
10025 | *code_p = NE_EXPR; | |
10026 | *op1_p = const_binop (MINUS_EXPR, op1, integer_one_node, 0); | |
10027 | break; | |
10028 | case LT_EXPR: | |
10029 | *code_p = EQ_EXPR; | |
10030 | *op1_p = const_binop (MINUS_EXPR, op1, integer_one_node, 0); | |
10031 | break; | |
10032 | default: | |
10033 | break; | |
10034 | } | |
10035 | ||
10036 | else if (TREE_INT_CST_HIGH (op1) == 0 | |
10037 | && TREE_INT_CST_LOW (op1) == signed_max | |
10038 | && TYPE_UNSIGNED (TREE_TYPE (op1)) | |
10039 | /* signed_type does not work on pointer types. */ | |
10040 | && INTEGRAL_TYPE_P (TREE_TYPE (op1))) | |
10041 | { | |
10042 | /* The following case also applies to X < signed_max+1 | |
10043 | and X >= signed_max+1 because previous transformations. */ | |
10044 | if (code == LE_EXPR || code == GT_EXPR) | |
10045 | { | |
10046 | tree st0, st1, exp, retval; | |
5135beeb | 10047 | st0 = lang_hooks.types.signed_type (TREE_TYPE (op0)); |
10048 | st1 = lang_hooks.types.signed_type (TREE_TYPE (op1)); | |
4ee9c684 | 10049 | |
fd96eeef | 10050 | exp = build2 (code == LE_EXPR ? GE_EXPR: LT_EXPR, |
10051 | type, | |
c0c67e38 | 10052 | fold_convert (st0, op0), |
10053 | fold_convert (st1, integer_zero_node)); | |
4ee9c684 | 10054 | |
10055 | retval | |
10056 | = nondestructive_fold_binary_to_constant (TREE_CODE (exp), | |
10057 | TREE_TYPE (exp), | |
10058 | TREE_OPERAND (exp, 0), | |
10059 | TREE_OPERAND (exp, 1)); | |
10060 | ||
10061 | /* If we are in gimple form, then returning EXP would create | |
10062 | non-gimple expressions. Clearing it is safe and insures | |
10063 | we do not allow a non-gimple expression to escape. */ | |
10064 | if (in_gimple_form) | |
10065 | exp = NULL; | |
10066 | ||
10067 | return (retval ? retval : exp); | |
10068 | } | |
10069 | } | |
10070 | } | |
10071 | ||
10072 | return NULL_TREE; | |
10073 | } | |
10074 | ||
10075 | ||
10076 | /* Given the components of a binary expression CODE, TYPE, OP0 and OP1, | |
10077 | attempt to fold the expression to a constant without modifying TYPE, | |
10078 | OP0 or OP1. | |
10079 | ||
10080 | If the expression could be simplified to a constant, then return | |
10081 | the constant. If the expression would not be simplified to a | |
10082 | constant, then return NULL_TREE. | |
10083 | ||
10084 | Note this is primarily designed to be called after gimplification | |
10085 | of the tree structures and when at least one operand is a constant. | |
10086 | As a result of those simplifying assumptions this routine is far | |
10087 | simpler than the generic fold routine. */ | |
10088 | ||
10089 | tree | |
10090 | nondestructive_fold_binary_to_constant (enum tree_code code, tree type, | |
10091 | tree op0, tree op1) | |
10092 | { | |
10093 | int wins = 1; | |
10094 | tree subop0; | |
10095 | tree subop1; | |
10096 | tree tem; | |
10097 | ||
10098 | /* If this is a commutative operation, and ARG0 is a constant, move it | |
10099 | to ARG1 to reduce the number of tests below. */ | |
10100 | if (commutative_tree_code (code) | |
10101 | && (TREE_CODE (op0) == INTEGER_CST || TREE_CODE (op0) == REAL_CST)) | |
10102 | { | |
10103 | tem = op0; | |
10104 | op0 = op1; | |
10105 | op1 = tem; | |
10106 | } | |
10107 | ||
10108 | /* If either operand is a complex type, extract its real component. */ | |
10109 | if (TREE_CODE (op0) == COMPLEX_CST) | |
10110 | subop0 = TREE_REALPART (op0); | |
10111 | else | |
10112 | subop0 = op0; | |
10113 | ||
10114 | if (TREE_CODE (op1) == COMPLEX_CST) | |
10115 | subop1 = TREE_REALPART (op1); | |
10116 | else | |
10117 | subop1 = op1; | |
10118 | ||
10119 | /* Note if either argument is not a real or integer constant. | |
10120 | With a few exceptions, simplification is limited to cases | |
10121 | where both arguments are constants. */ | |
10122 | if ((TREE_CODE (subop0) != INTEGER_CST | |
10123 | && TREE_CODE (subop0) != REAL_CST) | |
10124 | || (TREE_CODE (subop1) != INTEGER_CST | |
10125 | && TREE_CODE (subop1) != REAL_CST)) | |
10126 | wins = 0; | |
10127 | ||
10128 | switch (code) | |
10129 | { | |
10130 | case PLUS_EXPR: | |
10131 | /* (plus (address) (const_int)) is a constant. */ | |
10132 | if (TREE_CODE (op0) == PLUS_EXPR | |
10133 | && TREE_CODE (op1) == INTEGER_CST | |
10134 | && (TREE_CODE (TREE_OPERAND (op0, 0)) == ADDR_EXPR | |
10135 | || (TREE_CODE (TREE_OPERAND (op0, 0)) == NOP_EXPR | |
10136 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (op0, 0), 0)) | |
10137 | == ADDR_EXPR))) | |
10138 | && TREE_CODE (TREE_OPERAND (op0, 1)) == INTEGER_CST) | |
10139 | { | |
fd96eeef | 10140 | return build2 (PLUS_EXPR, type, TREE_OPERAND (op0, 0), |
10141 | const_binop (PLUS_EXPR, op1, | |
10142 | TREE_OPERAND (op0, 1), 0)); | |
4ee9c684 | 10143 | } |
10144 | case BIT_XOR_EXPR: | |
10145 | ||
10146 | binary: | |
10147 | if (!wins) | |
10148 | return NULL_TREE; | |
10149 | ||
10150 | /* Both arguments are constants. Simplify. */ | |
10151 | tem = const_binop (code, op0, op1, 0); | |
10152 | if (tem != NULL_TREE) | |
10153 | { | |
10154 | /* The return value should always have the same type as | |
10155 | the original expression. */ | |
10156 | if (TREE_TYPE (tem) != type) | |
c0c67e38 | 10157 | tem = fold_convert (type, tem); |
4ee9c684 | 10158 | |
10159 | return tem; | |
10160 | } | |
10161 | return NULL_TREE; | |
7206da1b | 10162 | |
4ee9c684 | 10163 | case MINUS_EXPR: |
10164 | /* Fold &x - &x. This can happen from &x.foo - &x. | |
10165 | This is unsafe for certain floats even in non-IEEE formats. | |
10166 | In IEEE, it is unsafe because it does wrong for NaNs. | |
10167 | Also note that operand_equal_p is always false if an | |
10168 | operand is volatile. */ | |
10169 | if (! FLOAT_TYPE_P (type) && operand_equal_p (op0, op1, 0)) | |
c0c67e38 | 10170 | return fold_convert (type, integer_zero_node); |
4ee9c684 | 10171 | |
10172 | goto binary; | |
10173 | ||
10174 | case MULT_EXPR: | |
10175 | case BIT_AND_EXPR: | |
10176 | /* Special case multiplication or bitwise AND where one argument | |
10177 | is zero. */ | |
10178 | if (! FLOAT_TYPE_P (type) && integer_zerop (op1)) | |
10179 | return omit_one_operand (type, op1, op0); | |
10180 | else | |
10181 | if (!HONOR_NANS (TYPE_MODE (TREE_TYPE (op0))) | |
10182 | && !HONOR_SIGNED_ZEROS (TYPE_MODE (TREE_TYPE (op0))) | |
10183 | && real_zerop (op1)) | |
10184 | return omit_one_operand (type, op1, op0); | |
10185 | ||
10186 | goto binary; | |
10187 | ||
10188 | case BIT_IOR_EXPR: | |
10189 | /* Special case when we know the result will be all ones. */ | |
10190 | if (integer_all_onesp (op1)) | |
10191 | return omit_one_operand (type, op1, op0); | |
10192 | ||
10193 | goto binary; | |
7206da1b | 10194 | |
4ee9c684 | 10195 | case TRUNC_DIV_EXPR: |
10196 | case ROUND_DIV_EXPR: | |
10197 | case FLOOR_DIV_EXPR: | |
10198 | case CEIL_DIV_EXPR: | |
10199 | case EXACT_DIV_EXPR: | |
10200 | case TRUNC_MOD_EXPR: | |
10201 | case ROUND_MOD_EXPR: | |
10202 | case FLOOR_MOD_EXPR: | |
10203 | case CEIL_MOD_EXPR: | |
10204 | case RDIV_EXPR: | |
10205 | /* Division by zero is undefined. */ | |
10206 | if (integer_zerop (op1)) | |
10207 | return NULL_TREE; | |
10208 | ||
10209 | if (TREE_CODE (op1) == REAL_CST | |
10210 | && !MODE_HAS_INFINITIES (TYPE_MODE (TREE_TYPE (op1))) | |
10211 | && real_zerop (op1)) | |
10212 | return NULL_TREE; | |
10213 | ||
10214 | goto binary; | |
10215 | ||
10216 | case MIN_EXPR: | |
10217 | if (INTEGRAL_TYPE_P (type) | |
10218 | && operand_equal_p (op1, TYPE_MIN_VALUE (type), OEP_ONLY_CONST)) | |
10219 | return omit_one_operand (type, op1, op0); | |
10220 | ||
10221 | goto binary; | |
10222 | ||
10223 | case MAX_EXPR: | |
10224 | if (INTEGRAL_TYPE_P (type) | |
10225 | && TYPE_MAX_VALUE (type) | |
10226 | && operand_equal_p (op1, TYPE_MAX_VALUE (type), OEP_ONLY_CONST)) | |
10227 | return omit_one_operand (type, op1, op0); | |
10228 | ||
10229 | goto binary; | |
10230 | ||
10231 | case RSHIFT_EXPR: | |
10232 | /* Optimize -1 >> x for arithmetic right shifts. */ | |
10233 | if (integer_all_onesp (op0) && ! TYPE_UNSIGNED (type)) | |
10234 | return omit_one_operand (type, op0, op1); | |
10235 | /* ... fall through ... */ | |
10236 | ||
10237 | case LSHIFT_EXPR: | |
10238 | if (integer_zerop (op0)) | |
10239 | return omit_one_operand (type, op0, op1); | |
10240 | ||
10241 | /* Since negative shift count is not well-defined, don't | |
10242 | try to compute it in the compiler. */ | |
10243 | if (TREE_CODE (op1) == INTEGER_CST && tree_int_cst_sgn (op1) < 0) | |
10244 | return NULL_TREE; | |
10245 | ||
10246 | goto binary; | |
10247 | ||
10248 | case LROTATE_EXPR: | |
10249 | case RROTATE_EXPR: | |
10250 | /* -1 rotated either direction by any amount is still -1. */ | |
10251 | if (integer_all_onesp (op0)) | |
10252 | return omit_one_operand (type, op0, op1); | |
10253 | ||
10254 | /* 0 rotated either direction by any amount is still zero. */ | |
10255 | if (integer_zerop (op0)) | |
10256 | return omit_one_operand (type, op0, op1); | |
10257 | ||
10258 | goto binary; | |
10259 | ||
10260 | case COMPLEX_EXPR: | |
10261 | if (wins) | |
10262 | return build_complex (type, op0, op1); | |
10263 | return NULL_TREE; | |
10264 | ||
10265 | case LT_EXPR: | |
10266 | case LE_EXPR: | |
10267 | case GT_EXPR: | |
10268 | case GE_EXPR: | |
10269 | case EQ_EXPR: | |
10270 | case NE_EXPR: | |
10271 | /* If one arg is a real or integer constant, put it last. */ | |
10272 | if ((TREE_CODE (op0) == INTEGER_CST | |
10273 | && TREE_CODE (op1) != INTEGER_CST) | |
10274 | || (TREE_CODE (op0) == REAL_CST | |
10275 | && TREE_CODE (op0) != REAL_CST)) | |
10276 | { | |
10277 | tree temp; | |
10278 | ||
10279 | temp = op0; | |
10280 | op0 = op1; | |
10281 | op1 = temp; | |
10282 | code = swap_tree_comparison (code); | |
10283 | } | |
10284 | ||
10285 | /* Change X >= C to X > (C - 1) and X < C to X <= (C - 1) if C > 0. | |
10286 | This transformation affects the cases which are handled in later | |
10287 | optimizations involving comparisons with non-negative constants. */ | |
10288 | if (TREE_CODE (op1) == INTEGER_CST | |
10289 | && TREE_CODE (op0) != INTEGER_CST | |
10290 | && tree_int_cst_sgn (op1) > 0) | |
10291 | { | |
10292 | switch (code) | |
10293 | { | |
10294 | case GE_EXPR: | |
10295 | code = GT_EXPR; | |
10296 | op1 = const_binop (MINUS_EXPR, op1, integer_one_node, 0); | |
10297 | break; | |
10298 | ||
10299 | case LT_EXPR: | |
10300 | code = LE_EXPR; | |
10301 | op1 = const_binop (MINUS_EXPR, op1, integer_one_node, 0); | |
10302 | break; | |
10303 | ||
10304 | default: | |
10305 | break; | |
10306 | } | |
10307 | } | |
10308 | ||
10309 | tem = fold_relational_hi_lo (&code, type, &op0, &op1); | |
10310 | if (tem) | |
10311 | return tem; | |
10312 | ||
2f64c430 | 10313 | /* Fall through. */ |
10314 | ||
10315 | case ORDERED_EXPR: | |
10316 | case UNORDERED_EXPR: | |
10317 | case UNLT_EXPR: | |
10318 | case UNLE_EXPR: | |
10319 | case UNGT_EXPR: | |
10320 | case UNGE_EXPR: | |
10321 | case UNEQ_EXPR: | |
10322 | case LTGT_EXPR: | |
4ee9c684 | 10323 | if (!wins) |
10324 | return NULL_TREE; | |
10325 | ||
10326 | return fold_relational_const (code, type, op0, op1); | |
10327 | ||
10328 | case RANGE_EXPR: | |
10329 | /* This could probably be handled. */ | |
10330 | return NULL_TREE; | |
10331 | ||
10332 | case TRUTH_AND_EXPR: | |
10333 | /* If second arg is constant zero, result is zero, but first arg | |
10334 | must be evaluated. */ | |
10335 | if (integer_zerop (op1)) | |
10336 | return omit_one_operand (type, op1, op0); | |
10337 | /* Likewise for first arg, but note that only the TRUTH_AND_EXPR | |
10338 | case will be handled here. */ | |
10339 | if (integer_zerop (op0)) | |
10340 | return omit_one_operand (type, op0, op1); | |
10341 | if (TREE_CODE (op0) == INTEGER_CST && TREE_CODE (op1) == INTEGER_CST) | |
20783f07 | 10342 | return constant_boolean_node (true, type); |
4ee9c684 | 10343 | return NULL_TREE; |
10344 | ||
10345 | case TRUTH_OR_EXPR: | |
10346 | /* If second arg is constant true, result is true, but we must | |
10347 | evaluate first arg. */ | |
10348 | if (TREE_CODE (op1) == INTEGER_CST && ! integer_zerop (op1)) | |
10349 | return omit_one_operand (type, op1, op0); | |
10350 | /* Likewise for first arg, but note this only occurs here for | |
10351 | TRUTH_OR_EXPR. */ | |
10352 | if (TREE_CODE (op0) == INTEGER_CST && ! integer_zerop (op0)) | |
10353 | return omit_one_operand (type, op0, op1); | |
10354 | if (TREE_CODE (op0) == INTEGER_CST && TREE_CODE (op1) == INTEGER_CST) | |
20783f07 | 10355 | return constant_boolean_node (false, type); |
4ee9c684 | 10356 | return NULL_TREE; |
10357 | ||
10358 | case TRUTH_XOR_EXPR: | |
10359 | if (TREE_CODE (op0) == INTEGER_CST && TREE_CODE (op1) == INTEGER_CST) | |
10360 | { | |
20783f07 | 10361 | int x = ! integer_zerop (op0) ^ ! integer_zerop (op1); |
10362 | return constant_boolean_node (x, type); | |
4ee9c684 | 10363 | } |
10364 | return NULL_TREE; | |
10365 | ||
10366 | default: | |
10367 | return NULL_TREE; | |
10368 | } | |
10369 | } | |
10370 | ||
10371 | /* Given the components of a unary expression CODE, TYPE and OP0, | |
10372 | attempt to fold the expression to a constant without modifying | |
7206da1b | 10373 | TYPE or OP0. |
4ee9c684 | 10374 | |
10375 | If the expression could be simplified to a constant, then return | |
10376 | the constant. If the expression would not be simplified to a | |
10377 | constant, then return NULL_TREE. | |
10378 | ||
10379 | Note this is primarily designed to be called after gimplification | |
10380 | of the tree structures and when op0 is a constant. As a result | |
10381 | of those simplifying assumptions this routine is far simpler than | |
10382 | the generic fold routine. */ | |
10383 | ||
10384 | tree | |
10385 | nondestructive_fold_unary_to_constant (enum tree_code code, tree type, | |
10386 | tree op0) | |
10387 | { | |
4ee9c684 | 10388 | /* Make sure we have a suitable constant argument. */ |
10389 | if (code == NOP_EXPR || code == FLOAT_EXPR || code == CONVERT_EXPR) | |
10390 | { | |
10391 | tree subop; | |
10392 | ||
10393 | if (TREE_CODE (op0) == COMPLEX_CST) | |
10394 | subop = TREE_REALPART (op0); | |
10395 | else | |
10396 | subop = op0; | |
10397 | ||
10398 | if (TREE_CODE (subop) != INTEGER_CST && TREE_CODE (subop) != REAL_CST) | |
10399 | return NULL_TREE; | |
10400 | } | |
10401 | ||
10402 | switch (code) | |
10403 | { | |
10404 | case NOP_EXPR: | |
10405 | case FLOAT_EXPR: | |
10406 | case CONVERT_EXPR: | |
10407 | case FIX_TRUNC_EXPR: | |
10408 | case FIX_FLOOR_EXPR: | |
10409 | case FIX_CEIL_EXPR: | |
10410 | return fold_convert_const (code, type, op0); | |
10411 | ||
10412 | case NEGATE_EXPR: | |
10413 | if (TREE_CODE (op0) == INTEGER_CST || TREE_CODE (op0) == REAL_CST) | |
10414 | return fold_negate_const (op0, type); | |
10415 | else | |
10416 | return NULL_TREE; | |
10417 | ||
10418 | case ABS_EXPR: | |
10419 | if (TREE_CODE (op0) == INTEGER_CST || TREE_CODE (op0) == REAL_CST) | |
10420 | return fold_abs_const (op0, type); | |
10421 | else | |
10422 | return NULL_TREE; | |
10423 | ||
10424 | case BIT_NOT_EXPR: | |
c183306c | 10425 | if (TREE_CODE (op0) == INTEGER_CST) |
10426 | return fold_not_const (op0, type); | |
4ee9c684 | 10427 | else |
10428 | return NULL_TREE; | |
10429 | ||
10430 | case REALPART_EXPR: | |
10431 | if (TREE_CODE (op0) == COMPLEX_CST) | |
10432 | return TREE_REALPART (op0); | |
10433 | else | |
10434 | return NULL_TREE; | |
10435 | ||
10436 | case IMAGPART_EXPR: | |
10437 | if (TREE_CODE (op0) == COMPLEX_CST) | |
10438 | return TREE_IMAGPART (op0); | |
10439 | else | |
10440 | return NULL_TREE; | |
10441 | ||
10442 | case CONJ_EXPR: | |
10443 | if (TREE_CODE (op0) == COMPLEX_CST | |
10444 | && TREE_CODE (TREE_TYPE (op0)) == COMPLEX_TYPE) | |
10445 | return build_complex (type, TREE_REALPART (op0), | |
10446 | negate_expr (TREE_IMAGPART (op0))); | |
10447 | return NULL_TREE; | |
10448 | ||
10449 | default: | |
10450 | return NULL_TREE; | |
10451 | } | |
10452 | } | |
10453 | ||
10454 | /* If EXP represents referencing an element in a constant string | |
10455 | (either via pointer arithmetic or array indexing), return the | |
10456 | tree representing the value accessed, otherwise return NULL. */ | |
10457 | ||
10458 | tree | |
10459 | fold_read_from_constant_string (tree exp) | |
10460 | { | |
10461 | if (TREE_CODE (exp) == INDIRECT_REF || TREE_CODE (exp) == ARRAY_REF) | |
10462 | { | |
10463 | tree exp1 = TREE_OPERAND (exp, 0); | |
10464 | tree index; | |
10465 | tree string; | |
10466 | ||
10467 | if (TREE_CODE (exp) == INDIRECT_REF) | |
6374121b | 10468 | string = string_constant (exp1, &index); |
4ee9c684 | 10469 | else |
10470 | { | |
6374121b | 10471 | tree low_bound = array_ref_low_bound (exp); |
c0c67e38 | 10472 | index = fold_convert (sizetype, TREE_OPERAND (exp, 1)); |
7206da1b | 10473 | |
4ee9c684 | 10474 | /* Optimize the special-case of a zero lower bound. |
10475 | ||
10476 | We convert the low_bound to sizetype to avoid some problems | |
10477 | with constant folding. (E.g. suppose the lower bound is 1, | |
10478 | and its mode is QI. Without the conversion,l (ARRAY | |
10479 | +(INDEX-(unsigned char)1)) becomes ((ARRAY+(-(unsigned char)1)) | |
10480 | +INDEX), which becomes (ARRAY+255+INDEX). Opps!) */ | |
10481 | if (! integer_zerop (low_bound)) | |
c0c67e38 | 10482 | index = size_diffop (index, fold_convert (sizetype, low_bound)); |
4ee9c684 | 10483 | |
10484 | string = exp1; | |
10485 | } | |
10486 | ||
10487 | if (string | |
6374121b | 10488 | && TREE_TYPE (exp) == TREE_TYPE (TREE_TYPE (string)) |
4ee9c684 | 10489 | && TREE_CODE (string) == STRING_CST |
10490 | && TREE_CODE (index) == INTEGER_CST | |
10491 | && compare_tree_int (index, TREE_STRING_LENGTH (string)) < 0 | |
10492 | && (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (TREE_TYPE (string)))) | |
10493 | == MODE_INT) | |
10494 | && (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (TREE_TYPE (string)))) == 1)) | |
9d14ee5b | 10495 | return fold_convert (TREE_TYPE (exp), |
7c446c95 | 10496 | build_int_cst (NULL_TREE, |
10497 | (TREE_STRING_POINTER (string) | |
7016c612 | 10498 | [TREE_INT_CST_LOW (index)]))); |
4ee9c684 | 10499 | } |
10500 | return NULL; | |
10501 | } | |
10502 | ||
9d77437d | 10503 | /* Return the tree for neg (ARG0) when ARG0 is known to be either |
10504 | an integer constant or real constant. | |
10505 | ||
10506 | TYPE is the type of the result. */ | |
10507 | ||
10508 | static tree | |
10509 | fold_negate_const (tree arg0, tree type) | |
10510 | { | |
10511 | tree t = NULL_TREE; | |
10512 | ||
fdada98f | 10513 | switch (TREE_CODE (arg0)) |
9d77437d | 10514 | { |
fdada98f | 10515 | case INTEGER_CST: |
10516 | { | |
10517 | unsigned HOST_WIDE_INT low; | |
10518 | HOST_WIDE_INT high; | |
10519 | int overflow = neg_double (TREE_INT_CST_LOW (arg0), | |
10520 | TREE_INT_CST_HIGH (arg0), | |
10521 | &low, &high); | |
10522 | t = build_int_cst_wide (type, low, high); | |
10523 | t = force_fit_type (t, 1, | |
10524 | (overflow | TREE_OVERFLOW (arg0)) | |
10525 | && !TYPE_UNSIGNED (type), | |
10526 | TREE_CONSTANT_OVERFLOW (arg0)); | |
10527 | break; | |
10528 | } | |
0c5713a2 | 10529 | |
fdada98f | 10530 | case REAL_CST: |
10531 | t = build_real (type, REAL_VALUE_NEGATE (TREE_REAL_CST (arg0))); | |
10532 | break; | |
7206da1b | 10533 | |
fdada98f | 10534 | default: |
10535 | gcc_unreachable (); | |
10536 | } | |
0c5713a2 | 10537 | |
9d77437d | 10538 | return t; |
10539 | } | |
10540 | ||
5221d284 | 10541 | /* Return the tree for abs (ARG0) when ARG0 is known to be either |
10542 | an integer constant or real constant. | |
10543 | ||
10544 | TYPE is the type of the result. */ | |
10545 | ||
d1aade50 | 10546 | tree |
5221d284 | 10547 | fold_abs_const (tree arg0, tree type) |
10548 | { | |
10549 | tree t = NULL_TREE; | |
10550 | ||
fdada98f | 10551 | switch (TREE_CODE (arg0)) |
5221d284 | 10552 | { |
fdada98f | 10553 | case INTEGER_CST: |
5221d284 | 10554 | /* If the value is unsigned, then the absolute value is |
10555 | the same as the ordinary value. */ | |
78a8ed03 | 10556 | if (TYPE_UNSIGNED (type)) |
fdada98f | 10557 | t = arg0; |
5221d284 | 10558 | /* Similarly, if the value is non-negative. */ |
10559 | else if (INT_CST_LT (integer_minus_one_node, arg0)) | |
fdada98f | 10560 | t = arg0; |
5221d284 | 10561 | /* If the value is negative, then the absolute value is |
10562 | its negation. */ | |
10563 | else | |
10564 | { | |
10565 | unsigned HOST_WIDE_INT low; | |
10566 | HOST_WIDE_INT high; | |
10567 | int overflow = neg_double (TREE_INT_CST_LOW (arg0), | |
10568 | TREE_INT_CST_HIGH (arg0), | |
10569 | &low, &high); | |
7016c612 | 10570 | t = build_int_cst_wide (type, low, high); |
4d28c5d1 | 10571 | t = force_fit_type (t, -1, overflow | TREE_OVERFLOW (arg0), |
10572 | TREE_CONSTANT_OVERFLOW (arg0)); | |
5221d284 | 10573 | } |
fdada98f | 10574 | break; |
0c5713a2 | 10575 | |
fdada98f | 10576 | case REAL_CST: |
5221d284 | 10577 | if (REAL_VALUE_NEGATIVE (TREE_REAL_CST (arg0))) |
fdada98f | 10578 | t = build_real (type, REAL_VALUE_NEGATE (TREE_REAL_CST (arg0))); |
5221d284 | 10579 | else |
fdada98f | 10580 | t = arg0; |
10581 | break; | |
0c5713a2 | 10582 | |
fdada98f | 10583 | default: |
10584 | gcc_unreachable (); | |
5221d284 | 10585 | } |
0c5713a2 | 10586 | |
5221d284 | 10587 | return t; |
10588 | } | |
10589 | ||
c183306c | 10590 | /* Return the tree for not (ARG0) when ARG0 is known to be an integer |
10591 | constant. TYPE is the type of the result. */ | |
10592 | ||
10593 | static tree | |
10594 | fold_not_const (tree arg0, tree type) | |
10595 | { | |
10596 | tree t = NULL_TREE; | |
10597 | ||
fdada98f | 10598 | gcc_assert (TREE_CODE (arg0) == INTEGER_CST); |
0c5713a2 | 10599 | |
fdada98f | 10600 | t = build_int_cst_wide (type, |
10601 | ~ TREE_INT_CST_LOW (arg0), | |
10602 | ~ TREE_INT_CST_HIGH (arg0)); | |
10603 | t = force_fit_type (t, 0, TREE_OVERFLOW (arg0), | |
10604 | TREE_CONSTANT_OVERFLOW (arg0)); | |
0c5713a2 | 10605 | |
c183306c | 10606 | return t; |
10607 | } | |
10608 | ||
ad46984d | 10609 | /* Given CODE, a relational operator, the target type, TYPE and two |
10610 | constant operands OP0 and OP1, return the result of the | |
10611 | relational operation. If the result is not a compile time | |
10612 | constant, then return NULL_TREE. */ | |
10613 | ||
10614 | static tree | |
10615 | fold_relational_const (enum tree_code code, tree type, tree op0, tree op1) | |
10616 | { | |
39d4c6de | 10617 | int result, invert; |
ad46984d | 10618 | |
10619 | /* From here on, the only cases we handle are when the result is | |
2f64c430 | 10620 | known to be a constant. */ |
10621 | ||
10622 | if (TREE_CODE (op0) == REAL_CST && TREE_CODE (op1) == REAL_CST) | |
10623 | { | |
990af12c | 10624 | const REAL_VALUE_TYPE *c0 = TREE_REAL_CST_PTR (op0); |
10625 | const REAL_VALUE_TYPE *c1 = TREE_REAL_CST_PTR (op1); | |
10626 | ||
2f64c430 | 10627 | /* Handle the cases where either operand is a NaN. */ |
990af12c | 10628 | if (real_isnan (c0) || real_isnan (c1)) |
2f64c430 | 10629 | { |
10630 | switch (code) | |
10631 | { | |
10632 | case EQ_EXPR: | |
10633 | case ORDERED_EXPR: | |
10634 | result = 0; | |
10635 | break; | |
10636 | ||
10637 | case NE_EXPR: | |
10638 | case UNORDERED_EXPR: | |
10639 | case UNLT_EXPR: | |
10640 | case UNLE_EXPR: | |
10641 | case UNGT_EXPR: | |
10642 | case UNGE_EXPR: | |
10643 | case UNEQ_EXPR: | |
10644 | result = 1; | |
10645 | break; | |
10646 | ||
10647 | case LT_EXPR: | |
10648 | case LE_EXPR: | |
10649 | case GT_EXPR: | |
10650 | case GE_EXPR: | |
10651 | case LTGT_EXPR: | |
10652 | if (flag_trapping_math) | |
10653 | return NULL_TREE; | |
10654 | result = 0; | |
10655 | break; | |
10656 | ||
10657 | default: | |
fdada98f | 10658 | gcc_unreachable (); |
2f64c430 | 10659 | } |
10660 | ||
10661 | return constant_boolean_node (result, type); | |
10662 | } | |
10663 | ||
990af12c | 10664 | return constant_boolean_node (real_compare (code, c0, c1), type); |
2f64c430 | 10665 | } |
10666 | ||
10667 | /* From here on we only handle LT, LE, GT, GE, EQ and NE. | |
ad46984d | 10668 | |
10669 | To compute GT, swap the arguments and do LT. | |
10670 | To compute GE, do LT and invert the result. | |
10671 | To compute LE, swap the arguments, do LT and invert the result. | |
10672 | To compute NE, do EQ and invert the result. | |
10673 | ||
10674 | Therefore, the code below must handle only EQ and LT. */ | |
10675 | ||
10676 | if (code == LE_EXPR || code == GT_EXPR) | |
10677 | { | |
39d4c6de | 10678 | tree tem = op0; |
10679 | op0 = op1; | |
10680 | op1 = tem; | |
ad46984d | 10681 | code = swap_tree_comparison (code); |
10682 | } | |
10683 | ||
10684 | /* Note that it is safe to invert for real values here because we | |
2f64c430 | 10685 | have already handled the one case that it matters. */ |
ad46984d | 10686 | |
ad46984d | 10687 | invert = 0; |
10688 | if (code == NE_EXPR || code == GE_EXPR) | |
10689 | { | |
10690 | invert = 1; | |
318a728f | 10691 | code = invert_tree_comparison (code, false); |
ad46984d | 10692 | } |
10693 | ||
10694 | /* Compute a result for LT or EQ if args permit; | |
10695 | Otherwise return T. */ | |
10696 | if (TREE_CODE (op0) == INTEGER_CST && TREE_CODE (op1) == INTEGER_CST) | |
10697 | { | |
10698 | if (code == EQ_EXPR) | |
39d4c6de | 10699 | result = tree_int_cst_equal (op0, op1); |
10700 | else if (TYPE_UNSIGNED (TREE_TYPE (op0))) | |
10701 | result = INT_CST_LT_UNSIGNED (op0, op1); | |
ad46984d | 10702 | else |
39d4c6de | 10703 | result = INT_CST_LT (op0, op1); |
ad46984d | 10704 | } |
39d4c6de | 10705 | else |
ad46984d | 10706 | return NULL_TREE; |
10707 | ||
10708 | if (invert) | |
39d4c6de | 10709 | result ^= 1; |
10710 | return constant_boolean_node (result, type); | |
ad46984d | 10711 | } |
10712 | ||
acbc760a | 10713 | /* Build an expression for the a clean point containing EXPR with type TYPE. |
10714 | Don't build a cleanup point expression for EXPR which don't have side | |
10715 | effects. */ | |
10716 | ||
10717 | tree | |
10718 | fold_build_cleanup_point_expr (tree type, tree expr) | |
10719 | { | |
10720 | /* If the expression does not have side effects then we don't have to wrap | |
10721 | it with a cleanup point expression. */ | |
10722 | if (!TREE_SIDE_EFFECTS (expr)) | |
10723 | return expr; | |
10724 | ||
10725 | return build1 (CLEANUP_POINT_EXPR, type, expr); | |
10726 | } | |
10727 | ||
fcdd3ab3 | 10728 | /* Build an expression for the address of T. Folds away INDIRECT_REF to |
10729 | avoid confusing the gimplify process. */ | |
10730 | ||
10731 | tree | |
10732 | build_fold_addr_expr_with_type (tree t, tree ptrtype) | |
10733 | { | |
41dc12b4 | 10734 | /* The size of the object is not relevant when talking about its address. */ |
10735 | if (TREE_CODE (t) == WITH_SIZE_EXPR) | |
10736 | t = TREE_OPERAND (t, 0); | |
10737 | ||
b056d812 | 10738 | /* Note: doesn't apply to ALIGN_INDIRECT_REF */ |
10739 | if (TREE_CODE (t) == INDIRECT_REF | |
10740 | || TREE_CODE (t) == MISALIGNED_INDIRECT_REF) | |
fcdd3ab3 | 10741 | { |
10742 | t = TREE_OPERAND (t, 0); | |
10743 | if (TREE_TYPE (t) != ptrtype) | |
10744 | t = build1 (NOP_EXPR, ptrtype, t); | |
10745 | } | |
10746 | else | |
10747 | { | |
10748 | tree base = t; | |
2de46a1b | 10749 | |
10750 | while (handled_component_p (base) | |
10751 | || TREE_CODE (base) == REALPART_EXPR | |
10752 | || TREE_CODE (base) == IMAGPART_EXPR) | |
fcdd3ab3 | 10753 | base = TREE_OPERAND (base, 0); |
10754 | if (DECL_P (base)) | |
10755 | TREE_ADDRESSABLE (base) = 1; | |
10756 | ||
10757 | t = build1 (ADDR_EXPR, ptrtype, t); | |
10758 | } | |
10759 | ||
10760 | return t; | |
10761 | } | |
10762 | ||
10763 | tree | |
10764 | build_fold_addr_expr (tree t) | |
10765 | { | |
10766 | return build_fold_addr_expr_with_type (t, build_pointer_type (TREE_TYPE (t))); | |
10767 | } | |
10768 | ||
10769 | /* Builds an expression for an indirection through T, simplifying some | |
10770 | cases. */ | |
10771 | ||
10772 | tree | |
10773 | build_fold_indirect_ref (tree t) | |
10774 | { | |
10775 | tree type = TREE_TYPE (TREE_TYPE (t)); | |
10776 | tree sub = t; | |
10777 | tree subtype; | |
10778 | ||
10779 | STRIP_NOPS (sub); | |
10780 | if (TREE_CODE (sub) == ADDR_EXPR) | |
10781 | { | |
10782 | tree op = TREE_OPERAND (sub, 0); | |
10783 | tree optype = TREE_TYPE (op); | |
10784 | /* *&p => p */ | |
10785 | if (lang_hooks.types_compatible_p (type, optype)) | |
10786 | return op; | |
10787 | /* *(foo *)&fooarray => fooarray[0] */ | |
10788 | else if (TREE_CODE (optype) == ARRAY_TYPE | |
10789 | && lang_hooks.types_compatible_p (type, TREE_TYPE (optype))) | |
6374121b | 10790 | return build4 (ARRAY_REF, type, op, size_zero_node, NULL_TREE, NULL_TREE); |
fcdd3ab3 | 10791 | } |
10792 | ||
10793 | /* *(foo *)fooarrptr => (*fooarrptr)[0] */ | |
10794 | subtype = TREE_TYPE (sub); | |
10795 | if (TREE_CODE (TREE_TYPE (subtype)) == ARRAY_TYPE | |
10796 | && lang_hooks.types_compatible_p (type, TREE_TYPE (TREE_TYPE (subtype)))) | |
10797 | { | |
10798 | sub = build_fold_indirect_ref (sub); | |
6374121b | 10799 | return build4 (ARRAY_REF, type, sub, size_zero_node, NULL_TREE, NULL_TREE); |
fcdd3ab3 | 10800 | } |
10801 | ||
10802 | return build1 (INDIRECT_REF, type, t); | |
10803 | } | |
10804 | ||
db97ad41 | 10805 | /* Strip non-trapping, non-side-effecting tree nodes from an expression |
10806 | whose result is ignored. The type of the returned tree need not be | |
10807 | the same as the original expression. */ | |
10808 | ||
10809 | tree | |
10810 | fold_ignored_result (tree t) | |
10811 | { | |
10812 | if (!TREE_SIDE_EFFECTS (t)) | |
10813 | return integer_zero_node; | |
10814 | ||
10815 | for (;;) | |
10816 | switch (TREE_CODE_CLASS (TREE_CODE (t))) | |
10817 | { | |
ce45a448 | 10818 | case tcc_unary: |
db97ad41 | 10819 | t = TREE_OPERAND (t, 0); |
10820 | break; | |
10821 | ||
ce45a448 | 10822 | case tcc_binary: |
10823 | case tcc_comparison: | |
db97ad41 | 10824 | if (!TREE_SIDE_EFFECTS (TREE_OPERAND (t, 1))) |
10825 | t = TREE_OPERAND (t, 0); | |
10826 | else if (!TREE_SIDE_EFFECTS (TREE_OPERAND (t, 0))) | |
10827 | t = TREE_OPERAND (t, 1); | |
10828 | else | |
10829 | return t; | |
10830 | break; | |
10831 | ||
ce45a448 | 10832 | case tcc_expression: |
db97ad41 | 10833 | switch (TREE_CODE (t)) |
10834 | { | |
10835 | case COMPOUND_EXPR: | |
10836 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (t, 1))) | |
10837 | return t; | |
10838 | t = TREE_OPERAND (t, 0); | |
10839 | break; | |
10840 | ||
10841 | case COND_EXPR: | |
10842 | if (TREE_SIDE_EFFECTS (TREE_OPERAND (t, 1)) | |
10843 | || TREE_SIDE_EFFECTS (TREE_OPERAND (t, 2))) | |
10844 | return t; | |
10845 | t = TREE_OPERAND (t, 0); | |
10846 | break; | |
10847 | ||
10848 | default: | |
10849 | return t; | |
10850 | } | |
10851 | break; | |
10852 | ||
10853 | default: | |
10854 | return t; | |
10855 | } | |
10856 | } | |
10857 | ||
59ff7b6e | 10858 | /* Return the value of VALUE, rounded up to a multiple of DIVISOR. |
10859 | This can only be applied to objects of a sizetype. */ | |
10860 | ||
10861 | tree | |
10862 | round_up (tree value, int divisor) | |
10863 | { | |
cda13ce3 | 10864 | tree div = NULL_TREE; |
59ff7b6e | 10865 | |
fdada98f | 10866 | gcc_assert (divisor > 0); |
59ff7b6e | 10867 | if (divisor == 1) |
10868 | return value; | |
10869 | ||
59ff7b6e | 10870 | /* See if VALUE is already a multiple of DIVISOR. If so, we don't |
cda13ce3 | 10871 | have to do anything. Only do this when we are not given a const, |
10872 | because in that case, this check is more expensive than just | |
fbf0afd1 | 10873 | doing it. */ |
cda13ce3 | 10874 | if (TREE_CODE (value) != INTEGER_CST) |
10875 | { | |
85390276 | 10876 | div = build_int_cst (TREE_TYPE (value), divisor); |
cda13ce3 | 10877 | |
10878 | if (multiple_of_p (TREE_TYPE (value), value, div)) | |
10879 | return value; | |
10880 | } | |
59ff7b6e | 10881 | |
10882 | /* If divisor is a power of two, simplify this to bit manipulation. */ | |
10883 | if (divisor == (divisor & -divisor)) | |
10884 | { | |
cda13ce3 | 10885 | tree t; |
0c5713a2 | 10886 | |
7016c612 | 10887 | t = build_int_cst (TREE_TYPE (value), divisor - 1); |
59ff7b6e | 10888 | value = size_binop (PLUS_EXPR, value, t); |
7016c612 | 10889 | t = build_int_cst (TREE_TYPE (value), -divisor); |
59ff7b6e | 10890 | value = size_binop (BIT_AND_EXPR, value, t); |
10891 | } | |
10892 | else | |
10893 | { | |
cda13ce3 | 10894 | if (!div) |
85390276 | 10895 | div = build_int_cst (TREE_TYPE (value), divisor); |
59ff7b6e | 10896 | value = size_binop (CEIL_DIV_EXPR, value, div); |
10897 | value = size_binop (MULT_EXPR, value, div); | |
10898 | } | |
10899 | ||
10900 | return value; | |
10901 | } | |
10902 | ||
10903 | /* Likewise, but round down. */ | |
10904 | ||
10905 | tree | |
10906 | round_down (tree value, int divisor) | |
10907 | { | |
cda13ce3 | 10908 | tree div = NULL_TREE; |
59ff7b6e | 10909 | |
fdada98f | 10910 | gcc_assert (divisor > 0); |
59ff7b6e | 10911 | if (divisor == 1) |
10912 | return value; | |
10913 | ||
59ff7b6e | 10914 | /* See if VALUE is already a multiple of DIVISOR. If so, we don't |
cda13ce3 | 10915 | have to do anything. Only do this when we are not given a const, |
10916 | because in that case, this check is more expensive than just | |
fbf0afd1 | 10917 | doing it. */ |
cda13ce3 | 10918 | if (TREE_CODE (value) != INTEGER_CST) |
10919 | { | |
85390276 | 10920 | div = build_int_cst (TREE_TYPE (value), divisor); |
cda13ce3 | 10921 | |
10922 | if (multiple_of_p (TREE_TYPE (value), value, div)) | |
10923 | return value; | |
10924 | } | |
59ff7b6e | 10925 | |
10926 | /* If divisor is a power of two, simplify this to bit manipulation. */ | |
10927 | if (divisor == (divisor & -divisor)) | |
10928 | { | |
cda13ce3 | 10929 | tree t; |
0c5713a2 | 10930 | |
7016c612 | 10931 | t = build_int_cst (TREE_TYPE (value), -divisor); |
59ff7b6e | 10932 | value = size_binop (BIT_AND_EXPR, value, t); |
10933 | } | |
10934 | else | |
10935 | { | |
cda13ce3 | 10936 | if (!div) |
85390276 | 10937 | div = build_int_cst (TREE_TYPE (value), divisor); |
59ff7b6e | 10938 | value = size_binop (FLOOR_DIV_EXPR, value, div); |
10939 | value = size_binop (MULT_EXPR, value, div); | |
10940 | } | |
10941 | ||
10942 | return value; | |
10943 | } | |
dbc64c75 | 10944 | |
eb91f88e | 10945 | /* Returns the pointer to the base of the object addressed by EXP and |
10946 | extracts the information about the offset of the access, storing it | |
10947 | to PBITPOS and POFFSET. */ | |
10948 | ||
10949 | static tree | |
10950 | split_address_to_core_and_offset (tree exp, | |
10951 | HOST_WIDE_INT *pbitpos, tree *poffset) | |
10952 | { | |
10953 | tree core; | |
10954 | enum machine_mode mode; | |
10955 | int unsignedp, volatilep; | |
10956 | HOST_WIDE_INT bitsize; | |
10957 | ||
10958 | if (TREE_CODE (exp) == ADDR_EXPR) | |
10959 | { | |
10960 | core = get_inner_reference (TREE_OPERAND (exp, 0), &bitsize, pbitpos, | |
10961 | poffset, &mode, &unsignedp, &volatilep); | |
10962 | ||
10963 | if (TREE_CODE (core) == INDIRECT_REF) | |
10964 | core = TREE_OPERAND (core, 0); | |
10965 | } | |
10966 | else | |
10967 | { | |
10968 | core = exp; | |
10969 | *pbitpos = 0; | |
10970 | *poffset = NULL_TREE; | |
10971 | } | |
10972 | ||
10973 | return core; | |
10974 | } | |
10975 | ||
dbc64c75 | 10976 | /* Returns true if addresses of E1 and E2 differ by a constant, false |
eb91f88e | 10977 | otherwise. If they do, E1 - E2 is stored in *DIFF. */ |
dbc64c75 | 10978 | |
10979 | bool | |
10980 | ptr_difference_const (tree e1, tree e2, HOST_WIDE_INT *diff) | |
10981 | { | |
10982 | tree core1, core2; | |
dbc64c75 | 10983 | HOST_WIDE_INT bitpos1, bitpos2; |
10984 | tree toffset1, toffset2, tdiff, type; | |
0c5713a2 | 10985 | |
eb91f88e | 10986 | core1 = split_address_to_core_and_offset (e1, &bitpos1, &toffset1); |
10987 | core2 = split_address_to_core_and_offset (e2, &bitpos2, &toffset2); | |
dbc64c75 | 10988 | |
10989 | if (bitpos1 % BITS_PER_UNIT != 0 | |
10990 | || bitpos2 % BITS_PER_UNIT != 0 | |
10991 | || !operand_equal_p (core1, core2, 0)) | |
10992 | return false; | |
10993 | ||
10994 | if (toffset1 && toffset2) | |
10995 | { | |
10996 | type = TREE_TYPE (toffset1); | |
10997 | if (type != TREE_TYPE (toffset2)) | |
10998 | toffset2 = fold_convert (type, toffset2); | |
10999 | ||
11000 | tdiff = fold (build2 (MINUS_EXPR, type, toffset1, toffset2)); | |
11001 | if (!host_integerp (tdiff, 0)) | |
11002 | return false; | |
11003 | ||
11004 | *diff = tree_low_cst (tdiff, 0); | |
11005 | } | |
11006 | else if (toffset1 || toffset2) | |
11007 | { | |
11008 | /* If only one of the offsets is non-constant, the difference cannot | |
11009 | be a constant. */ | |
11010 | return false; | |
11011 | } | |
11012 | else | |
11013 | *diff = 0; | |
11014 | ||
11015 | *diff += (bitpos1 - bitpos2) / BITS_PER_UNIT; | |
11016 | return true; | |
11017 | } |