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cbdd87d4 | 1 | /* Statement simplification on GIMPLE. |
23a5b65a | 2 | Copyright (C) 2010-2014 Free Software Foundation, Inc. |
cbdd87d4 RG |
3 | Split out from tree-ssa-ccp.c. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by the | |
9 | Free Software Foundation; either version 3, or (at your option) any | |
10 | later version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT | |
13 | ANY 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. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "tm.h" | |
25 | #include "tree.h" | |
d8a2d370 DN |
26 | #include "stringpool.h" |
27 | #include "expr.h" | |
28 | #include "stmt.h" | |
29 | #include "stor-layout.h" | |
cbdd87d4 | 30 | #include "flags.h" |
83685514 AM |
31 | #include "hashtab.h" |
32 | #include "hash-set.h" | |
33 | #include "vec.h" | |
34 | #include "machmode.h" | |
35 | #include "hard-reg-set.h" | |
36 | #include "input.h" | |
cbdd87d4 | 37 | #include "function.h" |
7ee2468b | 38 | #include "dumpfile.h" |
442b4905 | 39 | #include "bitmap.h" |
60393bbc AM |
40 | #include "predict.h" |
41 | #include "dominance.h" | |
2fb9a547 AM |
42 | #include "basic-block.h" |
43 | #include "tree-ssa-alias.h" | |
44 | #include "internal-fn.h" | |
45 | #include "gimple-fold.h" | |
46 | #include "gimple-expr.h" | |
47 | #include "is-a.h" | |
18f429e2 | 48 | #include "gimple.h" |
45b0be94 | 49 | #include "gimplify.h" |
5be5c238 | 50 | #include "gimple-iterator.h" |
442b4905 AM |
51 | #include "gimple-ssa.h" |
52 | #include "tree-ssanames.h" | |
53 | #include "tree-into-ssa.h" | |
54 | #include "tree-dfa.h" | |
7a300452 | 55 | #include "tree-ssa.h" |
cbdd87d4 | 56 | #include "tree-ssa-propagate.h" |
cbdd87d4 | 57 | #include "target.h" |
c582198b AM |
58 | #include "hash-map.h" |
59 | #include "plugin-api.h" | |
60 | #include "ipa-ref.h" | |
61 | #include "cgraph.h" | |
450ad0cd JH |
62 | #include "ipa-utils.h" |
63 | #include "gimple-pretty-print.h" | |
4484a35a | 64 | #include "tree-ssa-address.h" |
862d0b35 | 65 | #include "langhooks.h" |
19e51b40 | 66 | #include "gimplify-me.h" |
2b5f0895 | 67 | #include "dbgcnt.h" |
9b2b7279 | 68 | #include "builtins.h" |
fef5a0d9 | 69 | #include "output.h" |
e0ee10ed RB |
70 | #include "tree-eh.h" |
71 | #include "gimple-match.h" | |
45cc9f96 RB |
72 | #include "tree-phinodes.h" |
73 | #include "ssa-iterators.h" | |
cbdd87d4 | 74 | |
b3b9f3d0 | 75 | /* Return true when DECL can be referenced from current unit. |
c44c2088 JH |
76 | FROM_DECL (if non-null) specify constructor of variable DECL was taken from. |
77 | We can get declarations that are not possible to reference for various | |
78 | reasons: | |
1389294c | 79 | |
1389294c JH |
80 | 1) When analyzing C++ virtual tables. |
81 | C++ virtual tables do have known constructors even | |
82 | when they are keyed to other compilation unit. | |
83 | Those tables can contain pointers to methods and vars | |
84 | in other units. Those methods have both STATIC and EXTERNAL | |
85 | set. | |
86 | 2) In WHOPR mode devirtualization might lead to reference | |
87 | to method that was partitioned elsehwere. | |
88 | In this case we have static VAR_DECL or FUNCTION_DECL | |
89 | that has no corresponding callgraph/varpool node | |
b3b9f3d0 JH |
90 | declaring the body. |
91 | 3) COMDAT functions referred by external vtables that | |
3e89949e | 92 | we devirtualize only during final compilation stage. |
b3b9f3d0 JH |
93 | At this time we already decided that we will not output |
94 | the function body and thus we can't reference the symbol | |
95 | directly. */ | |
96 | ||
1389294c | 97 | static bool |
c44c2088 | 98 | can_refer_decl_in_current_unit_p (tree decl, tree from_decl) |
1389294c | 99 | { |
2c8326a5 | 100 | varpool_node *vnode; |
1389294c | 101 | struct cgraph_node *node; |
5e20cdc9 | 102 | symtab_node *snode; |
c44c2088 | 103 | |
00de328a | 104 | if (DECL_ABSTRACT_P (decl)) |
1632a686 JH |
105 | return false; |
106 | ||
107 | /* We are concerned only about static/external vars and functions. */ | |
108 | if ((!TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) | |
109 | || (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != FUNCTION_DECL)) | |
110 | return true; | |
111 | ||
112 | /* Static objects can be referred only if they was not optimized out yet. */ | |
113 | if (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl)) | |
114 | { | |
3aaf0529 JH |
115 | /* Before we start optimizing unreachable code we can be sure all |
116 | static objects are defined. */ | |
3dafb85c | 117 | if (symtab->function_flags_ready) |
3aaf0529 | 118 | return true; |
d52f5295 | 119 | snode = symtab_node::get (decl); |
3aaf0529 | 120 | if (!snode || !snode->definition) |
1632a686 | 121 | return false; |
7de90a6c | 122 | node = dyn_cast <cgraph_node *> (snode); |
1632a686 JH |
123 | return !node || !node->global.inlined_to; |
124 | } | |
125 | ||
6da8be89 | 126 | /* We will later output the initializer, so we can refer to it. |
c44c2088 | 127 | So we are concerned only when DECL comes from initializer of |
3aaf0529 | 128 | external var or var that has been optimized out. */ |
c44c2088 JH |
129 | if (!from_decl |
130 | || TREE_CODE (from_decl) != VAR_DECL | |
3aaf0529 | 131 | || (!DECL_EXTERNAL (from_decl) |
9041d2e6 | 132 | && (vnode = varpool_node::get (from_decl)) != NULL |
3aaf0529 | 133 | && vnode->definition) |
6da8be89 | 134 | || (flag_ltrans |
9041d2e6 | 135 | && (vnode = varpool_node::get (from_decl)) != NULL |
6adda80b | 136 | && vnode->in_other_partition)) |
c44c2088 | 137 | return true; |
c44c2088 JH |
138 | /* We are folding reference from external vtable. The vtable may reffer |
139 | to a symbol keyed to other compilation unit. The other compilation | |
140 | unit may be in separate DSO and the symbol may be hidden. */ | |
141 | if (DECL_VISIBILITY_SPECIFIED (decl) | |
142 | && DECL_EXTERNAL (decl) | |
a33a931b | 143 | && DECL_VISIBILITY (decl) != VISIBILITY_DEFAULT |
d52f5295 | 144 | && (!(snode = symtab_node::get (decl)) || !snode->in_other_partition)) |
c44c2088 | 145 | return false; |
b3b9f3d0 JH |
146 | /* When function is public, we always can introduce new reference. |
147 | Exception are the COMDAT functions where introducing a direct | |
148 | reference imply need to include function body in the curren tunit. */ | |
149 | if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) | |
150 | return true; | |
3aaf0529 JH |
151 | /* We have COMDAT. We are going to check if we still have definition |
152 | or if the definition is going to be output in other partition. | |
153 | Bypass this when gimplifying; all needed functions will be produced. | |
c44c2088 JH |
154 | |
155 | As observed in PR20991 for already optimized out comdat virtual functions | |
073a8998 | 156 | it may be tempting to not necessarily give up because the copy will be |
c44c2088 JH |
157 | output elsewhere when corresponding vtable is output. |
158 | This is however not possible - ABI specify that COMDATs are output in | |
159 | units where they are used and when the other unit was compiled with LTO | |
160 | it is possible that vtable was kept public while the function itself | |
161 | was privatized. */ | |
3dafb85c | 162 | if (!symtab->function_flags_ready) |
b3b9f3d0 | 163 | return true; |
c44c2088 | 164 | |
d52f5295 | 165 | snode = symtab_node::get (decl); |
3aaf0529 JH |
166 | if (!snode |
167 | || ((!snode->definition || DECL_EXTERNAL (decl)) | |
168 | && (!snode->in_other_partition | |
169 | || (!snode->forced_by_abi && !snode->force_output)))) | |
170 | return false; | |
171 | node = dyn_cast <cgraph_node *> (snode); | |
172 | return !node || !node->global.inlined_to; | |
1389294c JH |
173 | } |
174 | ||
0038d4e0 | 175 | /* CVAL is value taken from DECL_INITIAL of variable. Try to transform it into |
c44c2088 JH |
176 | acceptable form for is_gimple_min_invariant. |
177 | FROM_DECL (if non-NULL) specify variable whose constructor contains CVAL. */ | |
17f39a39 JH |
178 | |
179 | tree | |
c44c2088 | 180 | canonicalize_constructor_val (tree cval, tree from_decl) |
17f39a39 | 181 | { |
50619002 EB |
182 | tree orig_cval = cval; |
183 | STRIP_NOPS (cval); | |
315f5f1b RG |
184 | if (TREE_CODE (cval) == POINTER_PLUS_EXPR |
185 | && TREE_CODE (TREE_OPERAND (cval, 1)) == INTEGER_CST) | |
17f39a39 | 186 | { |
315f5f1b RG |
187 | tree ptr = TREE_OPERAND (cval, 0); |
188 | if (is_gimple_min_invariant (ptr)) | |
189 | cval = build1_loc (EXPR_LOCATION (cval), | |
190 | ADDR_EXPR, TREE_TYPE (ptr), | |
191 | fold_build2 (MEM_REF, TREE_TYPE (TREE_TYPE (ptr)), | |
192 | ptr, | |
193 | fold_convert (ptr_type_node, | |
194 | TREE_OPERAND (cval, 1)))); | |
17f39a39 JH |
195 | } |
196 | if (TREE_CODE (cval) == ADDR_EXPR) | |
197 | { | |
5a27a197 RG |
198 | tree base = NULL_TREE; |
199 | if (TREE_CODE (TREE_OPERAND (cval, 0)) == COMPOUND_LITERAL_EXPR) | |
ca5f4331 MM |
200 | { |
201 | base = COMPOUND_LITERAL_EXPR_DECL (TREE_OPERAND (cval, 0)); | |
202 | if (base) | |
203 | TREE_OPERAND (cval, 0) = base; | |
204 | } | |
5a27a197 RG |
205 | else |
206 | base = get_base_address (TREE_OPERAND (cval, 0)); | |
7501ca28 RG |
207 | if (!base) |
208 | return NULL_TREE; | |
b3b9f3d0 | 209 | |
7501ca28 RG |
210 | if ((TREE_CODE (base) == VAR_DECL |
211 | || TREE_CODE (base) == FUNCTION_DECL) | |
c44c2088 | 212 | && !can_refer_decl_in_current_unit_p (base, from_decl)) |
1389294c | 213 | return NULL_TREE; |
7501ca28 | 214 | if (TREE_CODE (base) == VAR_DECL) |
46eb666a | 215 | TREE_ADDRESSABLE (base) = 1; |
7501ca28 RG |
216 | else if (TREE_CODE (base) == FUNCTION_DECL) |
217 | { | |
218 | /* Make sure we create a cgraph node for functions we'll reference. | |
219 | They can be non-existent if the reference comes from an entry | |
220 | of an external vtable for example. */ | |
d52f5295 | 221 | cgraph_node::get_create (base); |
7501ca28 | 222 | } |
0038d4e0 | 223 | /* Fixup types in global initializers. */ |
73aef89e RG |
224 | if (TREE_TYPE (TREE_TYPE (cval)) != TREE_TYPE (TREE_OPERAND (cval, 0))) |
225 | cval = build_fold_addr_expr (TREE_OPERAND (cval, 0)); | |
50619002 EB |
226 | |
227 | if (!useless_type_conversion_p (TREE_TYPE (orig_cval), TREE_TYPE (cval))) | |
228 | cval = fold_convert (TREE_TYPE (orig_cval), cval); | |
229 | return cval; | |
17f39a39 | 230 | } |
846abd0d RB |
231 | if (TREE_OVERFLOW_P (cval)) |
232 | return drop_tree_overflow (cval); | |
50619002 | 233 | return orig_cval; |
17f39a39 | 234 | } |
cbdd87d4 RG |
235 | |
236 | /* If SYM is a constant variable with known value, return the value. | |
237 | NULL_TREE is returned otherwise. */ | |
238 | ||
239 | tree | |
240 | get_symbol_constant_value (tree sym) | |
241 | { | |
6a6dac52 JH |
242 | tree val = ctor_for_folding (sym); |
243 | if (val != error_mark_node) | |
cbdd87d4 | 244 | { |
cbdd87d4 RG |
245 | if (val) |
246 | { | |
9d60be38 | 247 | val = canonicalize_constructor_val (unshare_expr (val), sym); |
1389294c | 248 | if (val && is_gimple_min_invariant (val)) |
17f39a39 | 249 | return val; |
1389294c JH |
250 | else |
251 | return NULL_TREE; | |
cbdd87d4 RG |
252 | } |
253 | /* Variables declared 'const' without an initializer | |
254 | have zero as the initializer if they may not be | |
255 | overridden at link or run time. */ | |
256 | if (!val | |
cbdd87d4 RG |
257 | && (INTEGRAL_TYPE_P (TREE_TYPE (sym)) |
258 | || SCALAR_FLOAT_TYPE_P (TREE_TYPE (sym)))) | |
e8160c9a | 259 | return build_zero_cst (TREE_TYPE (sym)); |
cbdd87d4 RG |
260 | } |
261 | ||
262 | return NULL_TREE; | |
263 | } | |
264 | ||
265 | ||
cbdd87d4 RG |
266 | |
267 | /* Subroutine of fold_stmt. We perform several simplifications of the | |
268 | memory reference tree EXPR and make sure to re-gimplify them properly | |
269 | after propagation of constant addresses. IS_LHS is true if the | |
270 | reference is supposed to be an lvalue. */ | |
271 | ||
272 | static tree | |
273 | maybe_fold_reference (tree expr, bool is_lhs) | |
274 | { | |
17f39a39 | 275 | tree result; |
cbdd87d4 | 276 | |
f0eddb90 RG |
277 | if ((TREE_CODE (expr) == VIEW_CONVERT_EXPR |
278 | || TREE_CODE (expr) == REALPART_EXPR | |
279 | || TREE_CODE (expr) == IMAGPART_EXPR) | |
280 | && CONSTANT_CLASS_P (TREE_OPERAND (expr, 0))) | |
281 | return fold_unary_loc (EXPR_LOCATION (expr), | |
282 | TREE_CODE (expr), | |
283 | TREE_TYPE (expr), | |
284 | TREE_OPERAND (expr, 0)); | |
285 | else if (TREE_CODE (expr) == BIT_FIELD_REF | |
286 | && CONSTANT_CLASS_P (TREE_OPERAND (expr, 0))) | |
287 | return fold_ternary_loc (EXPR_LOCATION (expr), | |
288 | TREE_CODE (expr), | |
289 | TREE_TYPE (expr), | |
290 | TREE_OPERAND (expr, 0), | |
291 | TREE_OPERAND (expr, 1), | |
292 | TREE_OPERAND (expr, 2)); | |
293 | ||
f0eddb90 RG |
294 | if (!is_lhs |
295 | && (result = fold_const_aggregate_ref (expr)) | |
296 | && is_gimple_min_invariant (result)) | |
297 | return result; | |
cbdd87d4 | 298 | |
cbdd87d4 RG |
299 | return NULL_TREE; |
300 | } | |
301 | ||
302 | ||
303 | /* Attempt to fold an assignment statement pointed-to by SI. Returns a | |
304 | replacement rhs for the statement or NULL_TREE if no simplification | |
305 | could be made. It is assumed that the operands have been previously | |
306 | folded. */ | |
307 | ||
308 | static tree | |
309 | fold_gimple_assign (gimple_stmt_iterator *si) | |
310 | { | |
311 | gimple stmt = gsi_stmt (*si); | |
312 | enum tree_code subcode = gimple_assign_rhs_code (stmt); | |
313 | location_t loc = gimple_location (stmt); | |
314 | ||
315 | tree result = NULL_TREE; | |
316 | ||
317 | switch (get_gimple_rhs_class (subcode)) | |
318 | { | |
319 | case GIMPLE_SINGLE_RHS: | |
320 | { | |
321 | tree rhs = gimple_assign_rhs1 (stmt); | |
322 | ||
8c00ba08 JW |
323 | if (TREE_CLOBBER_P (rhs)) |
324 | return NULL_TREE; | |
325 | ||
4e71066d | 326 | if (REFERENCE_CLASS_P (rhs)) |
cbdd87d4 RG |
327 | return maybe_fold_reference (rhs, false); |
328 | ||
bdf37f7a JH |
329 | else if (TREE_CODE (rhs) == OBJ_TYPE_REF) |
330 | { | |
331 | tree val = OBJ_TYPE_REF_EXPR (rhs); | |
332 | if (is_gimple_min_invariant (val)) | |
333 | return val; | |
f8a39967 | 334 | else if (flag_devirtualize && virtual_method_call_p (rhs)) |
bdf37f7a JH |
335 | { |
336 | bool final; | |
337 | vec <cgraph_node *>targets | |
f8a39967 | 338 | = possible_polymorphic_call_targets (rhs, stmt, &final); |
2b5f0895 | 339 | if (final && targets.length () <= 1 && dbg_cnt (devirt)) |
bdf37f7a | 340 | { |
2b5f0895 XDL |
341 | if (dump_enabled_p ()) |
342 | { | |
807b7d62 | 343 | location_t loc = gimple_location_safe (stmt); |
2b5f0895 XDL |
344 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, loc, |
345 | "resolving virtual function address " | |
346 | "reference to function %s\n", | |
347 | targets.length () == 1 | |
348 | ? targets[0]->name () | |
3ef276e4 | 349 | : "NULL"); |
2b5f0895 | 350 | } |
3ef276e4 RB |
351 | if (targets.length () == 1) |
352 | { | |
353 | val = fold_convert (TREE_TYPE (val), | |
354 | build_fold_addr_expr_loc | |
355 | (loc, targets[0]->decl)); | |
356 | STRIP_USELESS_TYPE_CONVERSION (val); | |
357 | } | |
358 | else | |
359 | /* We can not use __builtin_unreachable here because it | |
360 | can not have address taken. */ | |
361 | val = build_int_cst (TREE_TYPE (val), 0); | |
bdf37f7a JH |
362 | return val; |
363 | } | |
364 | } | |
365 | ||
366 | } | |
cbdd87d4 RG |
367 | else if (TREE_CODE (rhs) == ADDR_EXPR) |
368 | { | |
70f34814 RG |
369 | tree ref = TREE_OPERAND (rhs, 0); |
370 | tree tem = maybe_fold_reference (ref, true); | |
371 | if (tem | |
372 | && TREE_CODE (tem) == MEM_REF | |
373 | && integer_zerop (TREE_OPERAND (tem, 1))) | |
374 | result = fold_convert (TREE_TYPE (rhs), TREE_OPERAND (tem, 0)); | |
375 | else if (tem) | |
cbdd87d4 RG |
376 | result = fold_convert (TREE_TYPE (rhs), |
377 | build_fold_addr_expr_loc (loc, tem)); | |
70f34814 RG |
378 | else if (TREE_CODE (ref) == MEM_REF |
379 | && integer_zerop (TREE_OPERAND (ref, 1))) | |
380 | result = fold_convert (TREE_TYPE (rhs), TREE_OPERAND (ref, 0)); | |
cbdd87d4 RG |
381 | } |
382 | ||
383 | else if (TREE_CODE (rhs) == CONSTRUCTOR | |
384 | && TREE_CODE (TREE_TYPE (rhs)) == VECTOR_TYPE | |
385 | && (CONSTRUCTOR_NELTS (rhs) | |
386 | == TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs)))) | |
387 | { | |
388 | /* Fold a constant vector CONSTRUCTOR to VECTOR_CST. */ | |
389 | unsigned i; | |
390 | tree val; | |
391 | ||
392 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (rhs), i, val) | |
393 | if (TREE_CODE (val) != INTEGER_CST | |
394 | && TREE_CODE (val) != REAL_CST | |
395 | && TREE_CODE (val) != FIXED_CST) | |
396 | return NULL_TREE; | |
397 | ||
398 | return build_vector_from_ctor (TREE_TYPE (rhs), | |
399 | CONSTRUCTOR_ELTS (rhs)); | |
400 | } | |
401 | ||
402 | else if (DECL_P (rhs)) | |
9d60be38 | 403 | return get_symbol_constant_value (rhs); |
cbdd87d4 RG |
404 | |
405 | /* If we couldn't fold the RHS, hand over to the generic | |
406 | fold routines. */ | |
407 | if (result == NULL_TREE) | |
408 | result = fold (rhs); | |
409 | ||
410 | /* Strip away useless type conversions. Both the NON_LVALUE_EXPR | |
411 | that may have been added by fold, and "useless" type | |
412 | conversions that might now be apparent due to propagation. */ | |
413 | STRIP_USELESS_TYPE_CONVERSION (result); | |
414 | ||
415 | if (result != rhs && valid_gimple_rhs_p (result)) | |
416 | return result; | |
417 | ||
418 | return NULL_TREE; | |
419 | } | |
420 | break; | |
421 | ||
422 | case GIMPLE_UNARY_RHS: | |
cbdd87d4 RG |
423 | break; |
424 | ||
425 | case GIMPLE_BINARY_RHS: | |
9b80d091 KT |
426 | /* Try to canonicalize for boolean-typed X the comparisons |
427 | X == 0, X == 1, X != 0, and X != 1. */ | |
315f5f1b RG |
428 | if (gimple_assign_rhs_code (stmt) == EQ_EXPR |
429 | || gimple_assign_rhs_code (stmt) == NE_EXPR) | |
9b80d091 KT |
430 | { |
431 | tree lhs = gimple_assign_lhs (stmt); | |
432 | tree op1 = gimple_assign_rhs1 (stmt); | |
433 | tree op2 = gimple_assign_rhs2 (stmt); | |
434 | tree type = TREE_TYPE (op1); | |
435 | ||
436 | /* Check whether the comparison operands are of the same boolean | |
437 | type as the result type is. | |
438 | Check that second operand is an integer-constant with value | |
439 | one or zero. */ | |
440 | if (TREE_CODE (op2) == INTEGER_CST | |
441 | && (integer_zerop (op2) || integer_onep (op2)) | |
442 | && useless_type_conversion_p (TREE_TYPE (lhs), type)) | |
443 | { | |
444 | enum tree_code cmp_code = gimple_assign_rhs_code (stmt); | |
445 | bool is_logical_not = false; | |
446 | ||
447 | /* X == 0 and X != 1 is a logical-not.of X | |
448 | X == 1 and X != 0 is X */ | |
449 | if ((cmp_code == EQ_EXPR && integer_zerop (op2)) | |
450 | || (cmp_code == NE_EXPR && integer_onep (op2))) | |
451 | is_logical_not = true; | |
452 | ||
453 | if (is_logical_not == false) | |
454 | result = op1; | |
455 | /* Only for one-bit precision typed X the transformation | |
456 | !X -> ~X is valied. */ | |
457 | else if (TYPE_PRECISION (type) == 1) | |
458 | result = build1_loc (gimple_location (stmt), BIT_NOT_EXPR, | |
459 | type, op1); | |
460 | /* Otherwise we use !X -> X ^ 1. */ | |
461 | else | |
462 | result = build2_loc (gimple_location (stmt), BIT_XOR_EXPR, | |
463 | type, op1, build_int_cst (type, 1)); | |
464 | ||
465 | } | |
466 | } | |
cbdd87d4 RG |
467 | |
468 | if (!result) | |
469 | result = fold_binary_loc (loc, subcode, | |
5fbcc0ed RG |
470 | TREE_TYPE (gimple_assign_lhs (stmt)), |
471 | gimple_assign_rhs1 (stmt), | |
472 | gimple_assign_rhs2 (stmt)); | |
cbdd87d4 RG |
473 | |
474 | if (result) | |
475 | { | |
476 | STRIP_USELESS_TYPE_CONVERSION (result); | |
477 | if (valid_gimple_rhs_p (result)) | |
478 | return result; | |
cbdd87d4 RG |
479 | } |
480 | break; | |
481 | ||
0354c0c7 | 482 | case GIMPLE_TERNARY_RHS: |
4e71066d RG |
483 | /* Try to fold a conditional expression. */ |
484 | if (gimple_assign_rhs_code (stmt) == COND_EXPR) | |
485 | { | |
486 | tree op0 = gimple_assign_rhs1 (stmt); | |
487 | tree tem; | |
488 | bool set = false; | |
489 | location_t cond_loc = gimple_location (stmt); | |
490 | ||
491 | if (COMPARISON_CLASS_P (op0)) | |
492 | { | |
493 | fold_defer_overflow_warnings (); | |
494 | tem = fold_binary_loc (cond_loc, | |
495 | TREE_CODE (op0), TREE_TYPE (op0), | |
496 | TREE_OPERAND (op0, 0), | |
497 | TREE_OPERAND (op0, 1)); | |
498 | /* This is actually a conditional expression, not a GIMPLE | |
499 | conditional statement, however, the valid_gimple_rhs_p | |
500 | test still applies. */ | |
501 | set = (tem && is_gimple_condexpr (tem) | |
502 | && valid_gimple_rhs_p (tem)); | |
503 | fold_undefer_overflow_warnings (set, stmt, 0); | |
504 | } | |
505 | else if (is_gimple_min_invariant (op0)) | |
506 | { | |
507 | tem = op0; | |
508 | set = true; | |
509 | } | |
510 | else | |
511 | return NULL_TREE; | |
512 | ||
513 | if (set) | |
514 | result = fold_build3_loc (cond_loc, COND_EXPR, | |
515 | TREE_TYPE (gimple_assign_lhs (stmt)), tem, | |
516 | gimple_assign_rhs2 (stmt), | |
517 | gimple_assign_rhs3 (stmt)); | |
518 | } | |
519 | ||
520 | if (!result) | |
521 | result = fold_ternary_loc (loc, subcode, | |
522 | TREE_TYPE (gimple_assign_lhs (stmt)), | |
523 | gimple_assign_rhs1 (stmt), | |
524 | gimple_assign_rhs2 (stmt), | |
525 | gimple_assign_rhs3 (stmt)); | |
0354c0c7 BS |
526 | |
527 | if (result) | |
528 | { | |
529 | STRIP_USELESS_TYPE_CONVERSION (result); | |
530 | if (valid_gimple_rhs_p (result)) | |
531 | return result; | |
0354c0c7 BS |
532 | } |
533 | break; | |
534 | ||
cbdd87d4 RG |
535 | case GIMPLE_INVALID_RHS: |
536 | gcc_unreachable (); | |
537 | } | |
538 | ||
539 | return NULL_TREE; | |
540 | } | |
541 | ||
542 | /* Attempt to fold a conditional statement. Return true if any changes were | |
543 | made. We only attempt to fold the condition expression, and do not perform | |
544 | any transformation that would require alteration of the cfg. It is | |
545 | assumed that the operands have been previously folded. */ | |
546 | ||
547 | static bool | |
548 | fold_gimple_cond (gimple stmt) | |
549 | { | |
550 | tree result = fold_binary_loc (gimple_location (stmt), | |
551 | gimple_cond_code (stmt), | |
552 | boolean_type_node, | |
553 | gimple_cond_lhs (stmt), | |
554 | gimple_cond_rhs (stmt)); | |
555 | ||
556 | if (result) | |
557 | { | |
558 | STRIP_USELESS_TYPE_CONVERSION (result); | |
559 | if (is_gimple_condexpr (result) && valid_gimple_rhs_p (result)) | |
560 | { | |
561 | gimple_cond_set_condition_from_tree (stmt, result); | |
562 | return true; | |
563 | } | |
564 | } | |
565 | ||
566 | return false; | |
567 | } | |
568 | ||
fef5a0d9 RB |
569 | |
570 | /* Replace a statement at *SI_P with a sequence of statements in STMTS, | |
571 | adjusting the replacement stmts location and virtual operands. | |
572 | If the statement has a lhs the last stmt in the sequence is expected | |
573 | to assign to that lhs. */ | |
574 | ||
575 | static void | |
576 | gsi_replace_with_seq_vops (gimple_stmt_iterator *si_p, gimple_seq stmts) | |
577 | { | |
578 | gimple stmt = gsi_stmt (*si_p); | |
579 | ||
580 | if (gimple_has_location (stmt)) | |
581 | annotate_all_with_location (stmts, gimple_location (stmt)); | |
582 | ||
583 | /* First iterate over the replacement statements backward, assigning | |
584 | virtual operands to their defining statements. */ | |
585 | gimple laststore = NULL; | |
586 | for (gimple_stmt_iterator i = gsi_last (stmts); | |
587 | !gsi_end_p (i); gsi_prev (&i)) | |
588 | { | |
589 | gimple new_stmt = gsi_stmt (i); | |
590 | if ((gimple_assign_single_p (new_stmt) | |
591 | && !is_gimple_reg (gimple_assign_lhs (new_stmt))) | |
592 | || (is_gimple_call (new_stmt) | |
593 | && (gimple_call_flags (new_stmt) | |
594 | & (ECF_NOVOPS | ECF_PURE | ECF_CONST | ECF_NORETURN)) == 0)) | |
595 | { | |
596 | tree vdef; | |
597 | if (!laststore) | |
598 | vdef = gimple_vdef (stmt); | |
599 | else | |
600 | vdef = make_ssa_name (gimple_vop (cfun), new_stmt); | |
601 | gimple_set_vdef (new_stmt, vdef); | |
602 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
603 | SSA_NAME_DEF_STMT (vdef) = new_stmt; | |
604 | laststore = new_stmt; | |
605 | } | |
606 | } | |
607 | ||
608 | /* Second iterate over the statements forward, assigning virtual | |
609 | operands to their uses. */ | |
610 | tree reaching_vuse = gimple_vuse (stmt); | |
611 | for (gimple_stmt_iterator i = gsi_start (stmts); | |
612 | !gsi_end_p (i); gsi_next (&i)) | |
613 | { | |
614 | gimple new_stmt = gsi_stmt (i); | |
615 | /* If the new statement possibly has a VUSE, update it with exact SSA | |
616 | name we know will reach this one. */ | |
617 | if (gimple_has_mem_ops (new_stmt)) | |
618 | gimple_set_vuse (new_stmt, reaching_vuse); | |
619 | gimple_set_modified (new_stmt, true); | |
620 | if (gimple_vdef (new_stmt)) | |
621 | reaching_vuse = gimple_vdef (new_stmt); | |
622 | } | |
623 | ||
624 | /* If the new sequence does not do a store release the virtual | |
625 | definition of the original statement. */ | |
626 | if (reaching_vuse | |
627 | && reaching_vuse == gimple_vuse (stmt)) | |
628 | { | |
629 | tree vdef = gimple_vdef (stmt); | |
630 | if (vdef | |
631 | && TREE_CODE (vdef) == SSA_NAME) | |
632 | { | |
633 | unlink_stmt_vdef (stmt); | |
634 | release_ssa_name (vdef); | |
635 | } | |
636 | } | |
637 | ||
638 | /* Finally replace the original statement with the sequence. */ | |
639 | gsi_replace_with_seq (si_p, stmts, false); | |
640 | } | |
641 | ||
cbdd87d4 RG |
642 | /* Convert EXPR into a GIMPLE value suitable for substitution on the |
643 | RHS of an assignment. Insert the necessary statements before | |
644 | iterator *SI_P. The statement at *SI_P, which must be a GIMPLE_CALL | |
645 | is replaced. If the call is expected to produces a result, then it | |
646 | is replaced by an assignment of the new RHS to the result variable. | |
647 | If the result is to be ignored, then the call is replaced by a | |
fe2ef088 MM |
648 | GIMPLE_NOP. A proper VDEF chain is retained by making the first |
649 | VUSE and the last VDEF of the whole sequence be the same as the replaced | |
650 | statement and using new SSA names for stores in between. */ | |
cbdd87d4 RG |
651 | |
652 | void | |
653 | gimplify_and_update_call_from_tree (gimple_stmt_iterator *si_p, tree expr) | |
654 | { | |
655 | tree lhs; | |
cbdd87d4 RG |
656 | gimple stmt, new_stmt; |
657 | gimple_stmt_iterator i; | |
355a7673 | 658 | gimple_seq stmts = NULL; |
cbdd87d4 RG |
659 | |
660 | stmt = gsi_stmt (*si_p); | |
661 | ||
662 | gcc_assert (is_gimple_call (stmt)); | |
663 | ||
45852dcc | 664 | push_gimplify_context (gimple_in_ssa_p (cfun)); |
cbdd87d4 | 665 | |
e256dfce | 666 | lhs = gimple_call_lhs (stmt); |
cbdd87d4 | 667 | if (lhs == NULL_TREE) |
6e572326 RG |
668 | { |
669 | gimplify_and_add (expr, &stmts); | |
670 | /* We can end up with folding a memcpy of an empty class assignment | |
671 | which gets optimized away by C++ gimplification. */ | |
672 | if (gimple_seq_empty_p (stmts)) | |
673 | { | |
9fdc58de | 674 | pop_gimplify_context (NULL); |
6e572326 RG |
675 | if (gimple_in_ssa_p (cfun)) |
676 | { | |
677 | unlink_stmt_vdef (stmt); | |
678 | release_defs (stmt); | |
679 | } | |
77d19c72 | 680 | gsi_replace (si_p, gimple_build_nop (), true); |
6e572326 RG |
681 | return; |
682 | } | |
683 | } | |
cbdd87d4 | 684 | else |
e256dfce RG |
685 | { |
686 | tree tmp = get_initialized_tmp_var (expr, &stmts, NULL); | |
687 | new_stmt = gimple_build_assign (lhs, tmp); | |
688 | i = gsi_last (stmts); | |
689 | gsi_insert_after_without_update (&i, new_stmt, | |
690 | GSI_CONTINUE_LINKING); | |
691 | } | |
cbdd87d4 RG |
692 | |
693 | pop_gimplify_context (NULL); | |
694 | ||
fef5a0d9 RB |
695 | gsi_replace_with_seq_vops (si_p, stmts); |
696 | } | |
cbdd87d4 | 697 | |
fef5a0d9 RB |
698 | |
699 | /* Replace the call at *GSI with the gimple value VAL. */ | |
700 | ||
701 | static void | |
702 | replace_call_with_value (gimple_stmt_iterator *gsi, tree val) | |
703 | { | |
704 | gimple stmt = gsi_stmt (*gsi); | |
705 | tree lhs = gimple_call_lhs (stmt); | |
706 | gimple repl; | |
707 | if (lhs) | |
e256dfce | 708 | { |
fef5a0d9 RB |
709 | if (!useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (val))) |
710 | val = fold_convert (TREE_TYPE (lhs), val); | |
711 | repl = gimple_build_assign (lhs, val); | |
712 | } | |
713 | else | |
714 | repl = gimple_build_nop (); | |
715 | tree vdef = gimple_vdef (stmt); | |
716 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
717 | { | |
718 | unlink_stmt_vdef (stmt); | |
719 | release_ssa_name (vdef); | |
720 | } | |
721 | gsi_replace (gsi, repl, true); | |
722 | } | |
723 | ||
724 | /* Replace the call at *GSI with the new call REPL and fold that | |
725 | again. */ | |
726 | ||
727 | static void | |
728 | replace_call_with_call_and_fold (gimple_stmt_iterator *gsi, gimple repl) | |
729 | { | |
730 | gimple stmt = gsi_stmt (*gsi); | |
731 | gimple_call_set_lhs (repl, gimple_call_lhs (stmt)); | |
732 | gimple_set_location (repl, gimple_location (stmt)); | |
733 | if (gimple_vdef (stmt) | |
734 | && TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) | |
735 | { | |
736 | gimple_set_vdef (repl, gimple_vdef (stmt)); | |
737 | gimple_set_vuse (repl, gimple_vuse (stmt)); | |
738 | SSA_NAME_DEF_STMT (gimple_vdef (repl)) = repl; | |
739 | } | |
740 | gsi_replace (gsi, repl, true); | |
741 | fold_stmt (gsi); | |
742 | } | |
743 | ||
744 | /* Return true if VAR is a VAR_DECL or a component thereof. */ | |
745 | ||
746 | static bool | |
747 | var_decl_component_p (tree var) | |
748 | { | |
749 | tree inner = var; | |
750 | while (handled_component_p (inner)) | |
751 | inner = TREE_OPERAND (inner, 0); | |
752 | return SSA_VAR_P (inner); | |
753 | } | |
754 | ||
755 | /* Fold function call to builtin mem{{,p}cpy,move}. Return | |
756 | NULL_TREE if no simplification can be made. | |
757 | If ENDP is 0, return DEST (like memcpy). | |
758 | If ENDP is 1, return DEST+LEN (like mempcpy). | |
759 | If ENDP is 2, return DEST+LEN-1 (like stpcpy). | |
760 | If ENDP is 3, return DEST, additionally *SRC and *DEST may overlap | |
761 | (memmove). */ | |
762 | ||
763 | static bool | |
764 | gimple_fold_builtin_memory_op (gimple_stmt_iterator *gsi, | |
765 | tree dest, tree src, int endp) | |
766 | { | |
767 | gimple stmt = gsi_stmt (*gsi); | |
768 | tree lhs = gimple_call_lhs (stmt); | |
769 | tree len = gimple_call_arg (stmt, 2); | |
770 | tree destvar, srcvar; | |
771 | location_t loc = gimple_location (stmt); | |
772 | ||
773 | /* If the LEN parameter is zero, return DEST. */ | |
774 | if (integer_zerop (len)) | |
775 | { | |
776 | gimple repl; | |
777 | if (gimple_call_lhs (stmt)) | |
778 | repl = gimple_build_assign (gimple_call_lhs (stmt), dest); | |
779 | else | |
780 | repl = gimple_build_nop (); | |
781 | tree vdef = gimple_vdef (stmt); | |
782 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
e256dfce | 783 | { |
fef5a0d9 RB |
784 | unlink_stmt_vdef (stmt); |
785 | release_ssa_name (vdef); | |
786 | } | |
787 | gsi_replace (gsi, repl, true); | |
788 | return true; | |
789 | } | |
790 | ||
791 | /* If SRC and DEST are the same (and not volatile), return | |
792 | DEST{,+LEN,+LEN-1}. */ | |
793 | if (operand_equal_p (src, dest, 0)) | |
794 | { | |
795 | unlink_stmt_vdef (stmt); | |
796 | if (gimple_vdef (stmt) && TREE_CODE (gimple_vdef (stmt)) == SSA_NAME) | |
797 | release_ssa_name (gimple_vdef (stmt)); | |
798 | if (!lhs) | |
799 | { | |
800 | gsi_replace (gsi, gimple_build_nop (), true); | |
801 | return true; | |
802 | } | |
803 | goto done; | |
804 | } | |
805 | else | |
806 | { | |
807 | tree srctype, desttype; | |
808 | unsigned int src_align, dest_align; | |
809 | tree off0; | |
810 | ||
811 | /* Build accesses at offset zero with a ref-all character type. */ | |
812 | off0 = build_int_cst (build_pointer_type_for_mode (char_type_node, | |
813 | ptr_mode, true), 0); | |
814 | ||
815 | /* If we can perform the copy efficiently with first doing all loads | |
816 | and then all stores inline it that way. Currently efficiently | |
817 | means that we can load all the memory into a single integer | |
818 | register which is what MOVE_MAX gives us. */ | |
819 | src_align = get_pointer_alignment (src); | |
820 | dest_align = get_pointer_alignment (dest); | |
821 | if (tree_fits_uhwi_p (len) | |
822 | && compare_tree_int (len, MOVE_MAX) <= 0 | |
823 | /* ??? Don't transform copies from strings with known length this | |
824 | confuses the tree-ssa-strlen.c. This doesn't handle | |
825 | the case in gcc.dg/strlenopt-8.c which is XFAILed for that | |
826 | reason. */ | |
827 | && !c_strlen (src, 2)) | |
828 | { | |
829 | unsigned ilen = tree_to_uhwi (len); | |
830 | if (exact_log2 (ilen) != -1) | |
831 | { | |
832 | tree type = lang_hooks.types.type_for_size (ilen * 8, 1); | |
833 | if (type | |
834 | && TYPE_MODE (type) != BLKmode | |
835 | && (GET_MODE_SIZE (TYPE_MODE (type)) * BITS_PER_UNIT | |
836 | == ilen * 8) | |
837 | /* If the destination pointer is not aligned we must be able | |
838 | to emit an unaligned store. */ | |
839 | && (dest_align >= GET_MODE_ALIGNMENT (TYPE_MODE (type)) | |
840 | || !SLOW_UNALIGNED_ACCESS (TYPE_MODE (type), dest_align))) | |
841 | { | |
842 | tree srctype = type; | |
843 | tree desttype = type; | |
844 | if (src_align < GET_MODE_ALIGNMENT (TYPE_MODE (type))) | |
845 | srctype = build_aligned_type (type, src_align); | |
846 | tree srcmem = fold_build2 (MEM_REF, srctype, src, off0); | |
847 | tree tem = fold_const_aggregate_ref (srcmem); | |
848 | if (tem) | |
849 | srcmem = tem; | |
850 | else if (src_align < GET_MODE_ALIGNMENT (TYPE_MODE (type)) | |
851 | && SLOW_UNALIGNED_ACCESS (TYPE_MODE (type), | |
852 | src_align)) | |
853 | srcmem = NULL_TREE; | |
854 | if (srcmem) | |
855 | { | |
856 | gimple new_stmt; | |
857 | if (is_gimple_reg_type (TREE_TYPE (srcmem))) | |
858 | { | |
859 | new_stmt = gimple_build_assign (NULL_TREE, srcmem); | |
860 | if (gimple_in_ssa_p (cfun)) | |
861 | srcmem = make_ssa_name (TREE_TYPE (srcmem), | |
862 | new_stmt); | |
863 | else | |
864 | srcmem = create_tmp_reg (TREE_TYPE (srcmem), | |
865 | NULL); | |
866 | gimple_assign_set_lhs (new_stmt, srcmem); | |
867 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
868 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
869 | } | |
870 | if (dest_align < GET_MODE_ALIGNMENT (TYPE_MODE (type))) | |
871 | desttype = build_aligned_type (type, dest_align); | |
872 | new_stmt | |
873 | = gimple_build_assign (fold_build2 (MEM_REF, desttype, | |
874 | dest, off0), | |
875 | srcmem); | |
876 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
877 | gimple_set_vdef (new_stmt, gimple_vdef (stmt)); | |
878 | if (gimple_vdef (new_stmt) | |
879 | && TREE_CODE (gimple_vdef (new_stmt)) == SSA_NAME) | |
880 | SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt; | |
881 | if (!lhs) | |
882 | { | |
883 | gsi_replace (gsi, new_stmt, true); | |
884 | return true; | |
885 | } | |
886 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
887 | goto done; | |
888 | } | |
889 | } | |
890 | } | |
891 | } | |
892 | ||
893 | if (endp == 3) | |
894 | { | |
895 | /* Both DEST and SRC must be pointer types. | |
896 | ??? This is what old code did. Is the testing for pointer types | |
897 | really mandatory? | |
898 | ||
899 | If either SRC is readonly or length is 1, we can use memcpy. */ | |
900 | if (!dest_align || !src_align) | |
901 | return false; | |
902 | if (readonly_data_expr (src) | |
903 | || (tree_fits_uhwi_p (len) | |
904 | && (MIN (src_align, dest_align) / BITS_PER_UNIT | |
905 | >= tree_to_uhwi (len)))) | |
906 | { | |
907 | tree fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
908 | if (!fn) | |
909 | return false; | |
910 | gimple_call_set_fndecl (stmt, fn); | |
911 | gimple_call_set_arg (stmt, 0, dest); | |
912 | gimple_call_set_arg (stmt, 1, src); | |
913 | fold_stmt (gsi); | |
914 | return true; | |
915 | } | |
916 | ||
917 | /* If *src and *dest can't overlap, optimize into memcpy as well. */ | |
918 | if (TREE_CODE (src) == ADDR_EXPR | |
919 | && TREE_CODE (dest) == ADDR_EXPR) | |
920 | { | |
921 | tree src_base, dest_base, fn; | |
922 | HOST_WIDE_INT src_offset = 0, dest_offset = 0; | |
923 | HOST_WIDE_INT size = -1; | |
924 | HOST_WIDE_INT maxsize = -1; | |
925 | ||
926 | srcvar = TREE_OPERAND (src, 0); | |
927 | src_base = get_ref_base_and_extent (srcvar, &src_offset, | |
928 | &size, &maxsize); | |
929 | destvar = TREE_OPERAND (dest, 0); | |
930 | dest_base = get_ref_base_and_extent (destvar, &dest_offset, | |
931 | &size, &maxsize); | |
932 | if (tree_fits_uhwi_p (len)) | |
933 | maxsize = tree_to_uhwi (len); | |
934 | else | |
935 | maxsize = -1; | |
936 | src_offset /= BITS_PER_UNIT; | |
937 | dest_offset /= BITS_PER_UNIT; | |
938 | if (SSA_VAR_P (src_base) | |
939 | && SSA_VAR_P (dest_base)) | |
940 | { | |
941 | if (operand_equal_p (src_base, dest_base, 0) | |
942 | && ranges_overlap_p (src_offset, maxsize, | |
943 | dest_offset, maxsize)) | |
944 | return false; | |
945 | } | |
946 | else if (TREE_CODE (src_base) == MEM_REF | |
947 | && TREE_CODE (dest_base) == MEM_REF) | |
948 | { | |
949 | if (! operand_equal_p (TREE_OPERAND (src_base, 0), | |
950 | TREE_OPERAND (dest_base, 0), 0)) | |
951 | return false; | |
952 | offset_int off = mem_ref_offset (src_base) + src_offset; | |
953 | if (!wi::fits_shwi_p (off)) | |
954 | return false; | |
955 | src_offset = off.to_shwi (); | |
956 | ||
957 | off = mem_ref_offset (dest_base) + dest_offset; | |
958 | if (!wi::fits_shwi_p (off)) | |
959 | return false; | |
960 | dest_offset = off.to_shwi (); | |
961 | if (ranges_overlap_p (src_offset, maxsize, | |
962 | dest_offset, maxsize)) | |
963 | return false; | |
964 | } | |
965 | else | |
966 | return false; | |
967 | ||
968 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
969 | if (!fn) | |
970 | return false; | |
971 | gimple_call_set_fndecl (stmt, fn); | |
972 | gimple_call_set_arg (stmt, 0, dest); | |
973 | gimple_call_set_arg (stmt, 1, src); | |
974 | fold_stmt (gsi); | |
975 | return true; | |
976 | } | |
977 | ||
978 | /* If the destination and source do not alias optimize into | |
979 | memcpy as well. */ | |
980 | if ((is_gimple_min_invariant (dest) | |
981 | || TREE_CODE (dest) == SSA_NAME) | |
982 | && (is_gimple_min_invariant (src) | |
983 | || TREE_CODE (src) == SSA_NAME)) | |
984 | { | |
985 | ao_ref destr, srcr; | |
986 | ao_ref_init_from_ptr_and_size (&destr, dest, len); | |
987 | ao_ref_init_from_ptr_and_size (&srcr, src, len); | |
988 | if (!refs_may_alias_p_1 (&destr, &srcr, false)) | |
989 | { | |
990 | tree fn; | |
991 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
992 | if (!fn) | |
993 | return false; | |
994 | gimple_call_set_fndecl (stmt, fn); | |
995 | gimple_call_set_arg (stmt, 0, dest); | |
996 | gimple_call_set_arg (stmt, 1, src); | |
997 | fold_stmt (gsi); | |
998 | return true; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | return false; | |
1003 | } | |
1004 | ||
1005 | if (!tree_fits_shwi_p (len)) | |
1006 | return false; | |
1007 | /* FIXME: | |
1008 | This logic lose for arguments like (type *)malloc (sizeof (type)), | |
1009 | since we strip the casts of up to VOID return value from malloc. | |
1010 | Perhaps we ought to inherit type from non-VOID argument here? */ | |
1011 | STRIP_NOPS (src); | |
1012 | STRIP_NOPS (dest); | |
1013 | if (!POINTER_TYPE_P (TREE_TYPE (src)) | |
1014 | || !POINTER_TYPE_P (TREE_TYPE (dest))) | |
1015 | return false; | |
1016 | /* In the following try to find a type that is most natural to be | |
1017 | used for the memcpy source and destination and that allows | |
1018 | the most optimization when memcpy is turned into a plain assignment | |
1019 | using that type. In theory we could always use a char[len] type | |
1020 | but that only gains us that the destination and source possibly | |
1021 | no longer will have their address taken. */ | |
1022 | /* As we fold (void *)(p + CST) to (void *)p + CST undo this here. */ | |
1023 | if (TREE_CODE (src) == POINTER_PLUS_EXPR) | |
1024 | { | |
1025 | tree tem = TREE_OPERAND (src, 0); | |
1026 | STRIP_NOPS (tem); | |
1027 | if (tem != TREE_OPERAND (src, 0)) | |
1028 | src = build1 (NOP_EXPR, TREE_TYPE (tem), src); | |
1029 | } | |
1030 | if (TREE_CODE (dest) == POINTER_PLUS_EXPR) | |
1031 | { | |
1032 | tree tem = TREE_OPERAND (dest, 0); | |
1033 | STRIP_NOPS (tem); | |
1034 | if (tem != TREE_OPERAND (dest, 0)) | |
1035 | dest = build1 (NOP_EXPR, TREE_TYPE (tem), dest); | |
1036 | } | |
1037 | srctype = TREE_TYPE (TREE_TYPE (src)); | |
1038 | if (TREE_CODE (srctype) == ARRAY_TYPE | |
1039 | && !tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len)) | |
1040 | { | |
1041 | srctype = TREE_TYPE (srctype); | |
1042 | STRIP_NOPS (src); | |
1043 | src = build1 (NOP_EXPR, build_pointer_type (srctype), src); | |
1044 | } | |
1045 | desttype = TREE_TYPE (TREE_TYPE (dest)); | |
1046 | if (TREE_CODE (desttype) == ARRAY_TYPE | |
1047 | && !tree_int_cst_equal (TYPE_SIZE_UNIT (desttype), len)) | |
1048 | { | |
1049 | desttype = TREE_TYPE (desttype); | |
1050 | STRIP_NOPS (dest); | |
1051 | dest = build1 (NOP_EXPR, build_pointer_type (desttype), dest); | |
1052 | } | |
1053 | if (TREE_ADDRESSABLE (srctype) | |
1054 | || TREE_ADDRESSABLE (desttype)) | |
1055 | return false; | |
1056 | ||
1057 | /* Make sure we are not copying using a floating-point mode or | |
1058 | a type whose size possibly does not match its precision. */ | |
1059 | if (FLOAT_MODE_P (TYPE_MODE (desttype)) | |
1060 | || TREE_CODE (desttype) == BOOLEAN_TYPE | |
1061 | || TREE_CODE (desttype) == ENUMERAL_TYPE) | |
1062 | desttype = bitwise_type_for_mode (TYPE_MODE (desttype)); | |
1063 | if (FLOAT_MODE_P (TYPE_MODE (srctype)) | |
1064 | || TREE_CODE (srctype) == BOOLEAN_TYPE | |
1065 | || TREE_CODE (srctype) == ENUMERAL_TYPE) | |
1066 | srctype = bitwise_type_for_mode (TYPE_MODE (srctype)); | |
1067 | if (!srctype) | |
1068 | srctype = desttype; | |
1069 | if (!desttype) | |
1070 | desttype = srctype; | |
1071 | if (!srctype) | |
1072 | return false; | |
1073 | ||
1074 | src_align = get_pointer_alignment (src); | |
1075 | dest_align = get_pointer_alignment (dest); | |
1076 | if (dest_align < TYPE_ALIGN (desttype) | |
1077 | || src_align < TYPE_ALIGN (srctype)) | |
1078 | return false; | |
1079 | ||
1080 | destvar = dest; | |
1081 | STRIP_NOPS (destvar); | |
1082 | if (TREE_CODE (destvar) == ADDR_EXPR | |
1083 | && var_decl_component_p (TREE_OPERAND (destvar, 0)) | |
1084 | && tree_int_cst_equal (TYPE_SIZE_UNIT (desttype), len)) | |
1085 | destvar = fold_build2 (MEM_REF, desttype, destvar, off0); | |
1086 | else | |
1087 | destvar = NULL_TREE; | |
1088 | ||
1089 | srcvar = src; | |
1090 | STRIP_NOPS (srcvar); | |
1091 | if (TREE_CODE (srcvar) == ADDR_EXPR | |
1092 | && var_decl_component_p (TREE_OPERAND (srcvar, 0)) | |
1093 | && tree_int_cst_equal (TYPE_SIZE_UNIT (srctype), len)) | |
1094 | { | |
1095 | if (!destvar | |
1096 | || src_align >= TYPE_ALIGN (desttype)) | |
1097 | srcvar = fold_build2 (MEM_REF, destvar ? desttype : srctype, | |
1098 | srcvar, off0); | |
1099 | else if (!STRICT_ALIGNMENT) | |
1100 | { | |
1101 | srctype = build_aligned_type (TYPE_MAIN_VARIANT (desttype), | |
1102 | src_align); | |
1103 | srcvar = fold_build2 (MEM_REF, srctype, srcvar, off0); | |
1104 | } | |
e256dfce | 1105 | else |
fef5a0d9 RB |
1106 | srcvar = NULL_TREE; |
1107 | } | |
1108 | else | |
1109 | srcvar = NULL_TREE; | |
1110 | ||
1111 | if (srcvar == NULL_TREE && destvar == NULL_TREE) | |
1112 | return false; | |
1113 | ||
1114 | if (srcvar == NULL_TREE) | |
1115 | { | |
1116 | STRIP_NOPS (src); | |
1117 | if (src_align >= TYPE_ALIGN (desttype)) | |
1118 | srcvar = fold_build2 (MEM_REF, desttype, src, off0); | |
1119 | else | |
1120 | { | |
1121 | if (STRICT_ALIGNMENT) | |
1122 | return false; | |
1123 | srctype = build_aligned_type (TYPE_MAIN_VARIANT (desttype), | |
1124 | src_align); | |
1125 | srcvar = fold_build2 (MEM_REF, srctype, src, off0); | |
1126 | } | |
1127 | } | |
1128 | else if (destvar == NULL_TREE) | |
1129 | { | |
1130 | STRIP_NOPS (dest); | |
1131 | if (dest_align >= TYPE_ALIGN (srctype)) | |
1132 | destvar = fold_build2 (MEM_REF, srctype, dest, off0); | |
1133 | else | |
1134 | { | |
1135 | if (STRICT_ALIGNMENT) | |
1136 | return false; | |
1137 | desttype = build_aligned_type (TYPE_MAIN_VARIANT (srctype), | |
1138 | dest_align); | |
1139 | destvar = fold_build2 (MEM_REF, desttype, dest, off0); | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | gimple new_stmt; | |
1144 | if (is_gimple_reg_type (TREE_TYPE (srcvar))) | |
1145 | { | |
1146 | new_stmt = gimple_build_assign (NULL_TREE, srcvar); | |
1147 | if (gimple_in_ssa_p (cfun)) | |
1148 | srcvar = make_ssa_name (TREE_TYPE (srcvar), new_stmt); | |
1149 | else | |
1150 | srcvar = create_tmp_reg (TREE_TYPE (srcvar), NULL); | |
1151 | gimple_assign_set_lhs (new_stmt, srcvar); | |
1152 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
1153 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
1154 | } | |
1155 | new_stmt = gimple_build_assign (destvar, srcvar); | |
1156 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
1157 | gimple_set_vdef (new_stmt, gimple_vdef (stmt)); | |
1158 | if (gimple_vdef (new_stmt) | |
1159 | && TREE_CODE (gimple_vdef (new_stmt)) == SSA_NAME) | |
1160 | SSA_NAME_DEF_STMT (gimple_vdef (new_stmt)) = new_stmt; | |
1161 | if (!lhs) | |
1162 | { | |
1163 | gsi_replace (gsi, new_stmt, true); | |
1164 | return true; | |
1165 | } | |
1166 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
1167 | } | |
1168 | ||
1169 | done: | |
1170 | if (endp == 0 || endp == 3) | |
1171 | len = NULL_TREE; | |
1172 | else if (endp == 2) | |
1173 | len = fold_build2_loc (loc, MINUS_EXPR, TREE_TYPE (len), len, | |
1174 | ssize_int (1)); | |
1175 | if (endp == 2 || endp == 1) | |
1176 | dest = fold_build_pointer_plus_loc (loc, dest, len); | |
1177 | ||
1178 | dest = force_gimple_operand_gsi (gsi, dest, false, NULL_TREE, true, | |
1179 | GSI_SAME_STMT); | |
1180 | gimple repl = gimple_build_assign (lhs, dest); | |
1181 | gsi_replace (gsi, repl, true); | |
1182 | return true; | |
1183 | } | |
1184 | ||
1185 | /* Fold function call to builtin memset or bzero at *GSI setting the | |
1186 | memory of size LEN to VAL. Return whether a simplification was made. */ | |
1187 | ||
1188 | static bool | |
1189 | gimple_fold_builtin_memset (gimple_stmt_iterator *gsi, tree c, tree len) | |
1190 | { | |
1191 | gimple stmt = gsi_stmt (*gsi); | |
1192 | tree etype; | |
1193 | unsigned HOST_WIDE_INT length, cval; | |
1194 | ||
1195 | /* If the LEN parameter is zero, return DEST. */ | |
1196 | if (integer_zerop (len)) | |
1197 | { | |
1198 | replace_call_with_value (gsi, gimple_call_arg (stmt, 0)); | |
1199 | return true; | |
1200 | } | |
1201 | ||
1202 | if (! tree_fits_uhwi_p (len)) | |
1203 | return false; | |
1204 | ||
1205 | if (TREE_CODE (c) != INTEGER_CST) | |
1206 | return false; | |
1207 | ||
1208 | tree dest = gimple_call_arg (stmt, 0); | |
1209 | tree var = dest; | |
1210 | if (TREE_CODE (var) != ADDR_EXPR) | |
1211 | return false; | |
1212 | ||
1213 | var = TREE_OPERAND (var, 0); | |
1214 | if (TREE_THIS_VOLATILE (var)) | |
1215 | return false; | |
1216 | ||
1217 | etype = TREE_TYPE (var); | |
1218 | if (TREE_CODE (etype) == ARRAY_TYPE) | |
1219 | etype = TREE_TYPE (etype); | |
1220 | ||
1221 | if (!INTEGRAL_TYPE_P (etype) | |
1222 | && !POINTER_TYPE_P (etype)) | |
1223 | return NULL_TREE; | |
1224 | ||
1225 | if (! var_decl_component_p (var)) | |
1226 | return NULL_TREE; | |
1227 | ||
1228 | length = tree_to_uhwi (len); | |
1229 | if (GET_MODE_SIZE (TYPE_MODE (etype)) != length | |
1230 | || get_pointer_alignment (dest) / BITS_PER_UNIT < length) | |
1231 | return NULL_TREE; | |
1232 | ||
1233 | if (length > HOST_BITS_PER_WIDE_INT / BITS_PER_UNIT) | |
1234 | return NULL_TREE; | |
1235 | ||
1236 | if (integer_zerop (c)) | |
1237 | cval = 0; | |
1238 | else | |
1239 | { | |
1240 | if (CHAR_BIT != 8 || BITS_PER_UNIT != 8 || HOST_BITS_PER_WIDE_INT > 64) | |
1241 | return NULL_TREE; | |
1242 | ||
1243 | cval = TREE_INT_CST_LOW (c); | |
1244 | cval &= 0xff; | |
1245 | cval |= cval << 8; | |
1246 | cval |= cval << 16; | |
1247 | cval |= (cval << 31) << 1; | |
1248 | } | |
1249 | ||
1250 | var = fold_build2 (MEM_REF, etype, dest, build_int_cst (ptr_type_node, 0)); | |
1251 | gimple store = gimple_build_assign (var, build_int_cst_type (etype, cval)); | |
1252 | gimple_set_vuse (store, gimple_vuse (stmt)); | |
1253 | tree vdef = gimple_vdef (stmt); | |
1254 | if (vdef && TREE_CODE (vdef) == SSA_NAME) | |
1255 | { | |
1256 | gimple_set_vdef (store, gimple_vdef (stmt)); | |
1257 | SSA_NAME_DEF_STMT (gimple_vdef (stmt)) = store; | |
1258 | } | |
1259 | gsi_insert_before (gsi, store, GSI_SAME_STMT); | |
1260 | if (gimple_call_lhs (stmt)) | |
1261 | { | |
1262 | gimple asgn = gimple_build_assign (gimple_call_lhs (stmt), dest); | |
1263 | gsi_replace (gsi, asgn, true); | |
1264 | } | |
1265 | else | |
1266 | { | |
1267 | gimple_stmt_iterator gsi2 = *gsi; | |
1268 | gsi_prev (gsi); | |
1269 | gsi_remove (&gsi2, true); | |
1270 | } | |
1271 | ||
1272 | return true; | |
1273 | } | |
1274 | ||
1275 | ||
1276 | /* Return the string length, maximum string length or maximum value of | |
1277 | ARG in LENGTH. | |
1278 | If ARG is an SSA name variable, follow its use-def chains. If LENGTH | |
1279 | is not NULL and, for TYPE == 0, its value is not equal to the length | |
1280 | we determine or if we are unable to determine the length or value, | |
1281 | return false. VISITED is a bitmap of visited variables. | |
1282 | TYPE is 0 if string length should be returned, 1 for maximum string | |
1283 | length and 2 for maximum value ARG can have. */ | |
1284 | ||
1285 | static bool | |
dcb7fae2 | 1286 | get_maxval_strlen (tree arg, tree *length, bitmap *visited, int type) |
fef5a0d9 RB |
1287 | { |
1288 | tree var, val; | |
1289 | gimple def_stmt; | |
1290 | ||
1291 | if (TREE_CODE (arg) != SSA_NAME) | |
1292 | { | |
1293 | /* We can end up with &(*iftmp_1)[0] here as well, so handle it. */ | |
1294 | if (TREE_CODE (arg) == ADDR_EXPR | |
1295 | && TREE_CODE (TREE_OPERAND (arg, 0)) == ARRAY_REF | |
1296 | && integer_zerop (TREE_OPERAND (TREE_OPERAND (arg, 0), 1))) | |
1297 | { | |
1298 | tree aop0 = TREE_OPERAND (TREE_OPERAND (arg, 0), 0); | |
1299 | if (TREE_CODE (aop0) == INDIRECT_REF | |
1300 | && TREE_CODE (TREE_OPERAND (aop0, 0)) == SSA_NAME) | |
1301 | return get_maxval_strlen (TREE_OPERAND (aop0, 0), | |
1302 | length, visited, type); | |
1303 | } | |
1304 | ||
1305 | if (type == 2) | |
1306 | { | |
1307 | val = arg; | |
1308 | if (TREE_CODE (val) != INTEGER_CST | |
1309 | || tree_int_cst_sgn (val) < 0) | |
1310 | return false; | |
1311 | } | |
1312 | else | |
1313 | val = c_strlen (arg, 1); | |
1314 | if (!val) | |
1315 | return false; | |
1316 | ||
1317 | if (*length) | |
1318 | { | |
1319 | if (type > 0) | |
1320 | { | |
1321 | if (TREE_CODE (*length) != INTEGER_CST | |
1322 | || TREE_CODE (val) != INTEGER_CST) | |
1323 | return false; | |
1324 | ||
1325 | if (tree_int_cst_lt (*length, val)) | |
1326 | *length = val; | |
1327 | return true; | |
1328 | } | |
1329 | else if (simple_cst_equal (val, *length) != 1) | |
1330 | return false; | |
1331 | } | |
1332 | ||
1333 | *length = val; | |
1334 | return true; | |
1335 | } | |
1336 | ||
1337 | /* If ARG is registered for SSA update we cannot look at its defining | |
1338 | statement. */ | |
1339 | if (name_registered_for_update_p (arg)) | |
1340 | return false; | |
1341 | ||
1342 | /* If we were already here, break the infinite cycle. */ | |
dcb7fae2 RB |
1343 | if (!*visited) |
1344 | *visited = BITMAP_ALLOC (NULL); | |
1345 | if (!bitmap_set_bit (*visited, SSA_NAME_VERSION (arg))) | |
fef5a0d9 RB |
1346 | return true; |
1347 | ||
1348 | var = arg; | |
1349 | def_stmt = SSA_NAME_DEF_STMT (var); | |
1350 | ||
1351 | switch (gimple_code (def_stmt)) | |
1352 | { | |
1353 | case GIMPLE_ASSIGN: | |
1354 | /* The RHS of the statement defining VAR must either have a | |
1355 | constant length or come from another SSA_NAME with a constant | |
1356 | length. */ | |
1357 | if (gimple_assign_single_p (def_stmt) | |
1358 | || gimple_assign_unary_nop_p (def_stmt)) | |
1359 | { | |
1360 | tree rhs = gimple_assign_rhs1 (def_stmt); | |
1361 | return get_maxval_strlen (rhs, length, visited, type); | |
1362 | } | |
1363 | else if (gimple_assign_rhs_code (def_stmt) == COND_EXPR) | |
1364 | { | |
1365 | tree op2 = gimple_assign_rhs2 (def_stmt); | |
1366 | tree op3 = gimple_assign_rhs3 (def_stmt); | |
1367 | return get_maxval_strlen (op2, length, visited, type) | |
1368 | && get_maxval_strlen (op3, length, visited, type); | |
1369 | } | |
1370 | return false; | |
1371 | ||
1372 | case GIMPLE_PHI: | |
1373 | { | |
1374 | /* All the arguments of the PHI node must have the same constant | |
1375 | length. */ | |
1376 | unsigned i; | |
1377 | ||
1378 | for (i = 0; i < gimple_phi_num_args (def_stmt); i++) | |
1379 | { | |
1380 | tree arg = gimple_phi_arg (def_stmt, i)->def; | |
1381 | ||
1382 | /* If this PHI has itself as an argument, we cannot | |
1383 | determine the string length of this argument. However, | |
1384 | if we can find a constant string length for the other | |
1385 | PHI args then we can still be sure that this is a | |
1386 | constant string length. So be optimistic and just | |
1387 | continue with the next argument. */ | |
1388 | if (arg == gimple_phi_result (def_stmt)) | |
1389 | continue; | |
1390 | ||
1391 | if (!get_maxval_strlen (arg, length, visited, type)) | |
1392 | return false; | |
1393 | } | |
1394 | } | |
1395 | return true; | |
1396 | ||
1397 | default: | |
1398 | return false; | |
1399 | } | |
1400 | } | |
1401 | ||
dcb7fae2 RB |
1402 | tree |
1403 | get_maxval_strlen (tree arg, int type) | |
1404 | { | |
1405 | bitmap visited = NULL; | |
1406 | tree len = NULL_TREE; | |
1407 | if (!get_maxval_strlen (arg, &len, &visited, type)) | |
1408 | len = NULL_TREE; | |
1409 | if (visited) | |
1410 | BITMAP_FREE (visited); | |
1411 | ||
1412 | return len; | |
1413 | } | |
1414 | ||
fef5a0d9 RB |
1415 | |
1416 | /* Fold function call to builtin strcpy with arguments DEST and SRC. | |
1417 | If LEN is not NULL, it represents the length of the string to be | |
1418 | copied. Return NULL_TREE if no simplification can be made. */ | |
1419 | ||
1420 | static bool | |
1421 | gimple_fold_builtin_strcpy (gimple_stmt_iterator *gsi, | |
dcb7fae2 | 1422 | tree dest, tree src) |
fef5a0d9 | 1423 | { |
dcb7fae2 | 1424 | location_t loc = gimple_location (gsi_stmt (*gsi)); |
fef5a0d9 RB |
1425 | tree fn; |
1426 | ||
1427 | /* If SRC and DEST are the same (and not volatile), return DEST. */ | |
1428 | if (operand_equal_p (src, dest, 0)) | |
1429 | { | |
1430 | replace_call_with_value (gsi, dest); | |
1431 | return true; | |
1432 | } | |
1433 | ||
1434 | if (optimize_function_for_size_p (cfun)) | |
1435 | return false; | |
1436 | ||
1437 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
1438 | if (!fn) | |
1439 | return false; | |
1440 | ||
1579e1f8 | 1441 | tree len = get_maxval_strlen (src, 0); |
fef5a0d9 | 1442 | if (!len) |
dcb7fae2 | 1443 | return false; |
fef5a0d9 RB |
1444 | |
1445 | len = fold_convert_loc (loc, size_type_node, len); | |
1446 | len = size_binop_loc (loc, PLUS_EXPR, len, build_int_cst (size_type_node, 1)); | |
1447 | len = force_gimple_operand_gsi (gsi, len, true, | |
1448 | NULL_TREE, true, GSI_SAME_STMT); | |
1449 | gimple repl = gimple_build_call (fn, 3, dest, src, len); | |
1450 | replace_call_with_call_and_fold (gsi, repl); | |
1451 | return true; | |
1452 | } | |
1453 | ||
1454 | /* Fold function call to builtin strncpy with arguments DEST, SRC, and LEN. | |
1455 | If SLEN is not NULL, it represents the length of the source string. | |
1456 | Return NULL_TREE if no simplification can be made. */ | |
1457 | ||
1458 | static bool | |
dcb7fae2 RB |
1459 | gimple_fold_builtin_strncpy (gimple_stmt_iterator *gsi, |
1460 | tree dest, tree src, tree len) | |
fef5a0d9 | 1461 | { |
dcb7fae2 | 1462 | location_t loc = gimple_location (gsi_stmt (*gsi)); |
fef5a0d9 RB |
1463 | tree fn; |
1464 | ||
1465 | /* If the LEN parameter is zero, return DEST. */ | |
1466 | if (integer_zerop (len)) | |
1467 | { | |
1468 | replace_call_with_value (gsi, dest); | |
1469 | return true; | |
1470 | } | |
1471 | ||
1472 | /* We can't compare slen with len as constants below if len is not a | |
1473 | constant. */ | |
dcb7fae2 | 1474 | if (TREE_CODE (len) != INTEGER_CST) |
fef5a0d9 RB |
1475 | return false; |
1476 | ||
fef5a0d9 | 1477 | /* Now, we must be passed a constant src ptr parameter. */ |
1579e1f8 | 1478 | tree slen = get_maxval_strlen (src, 0); |
dcb7fae2 | 1479 | if (!slen || TREE_CODE (slen) != INTEGER_CST) |
fef5a0d9 RB |
1480 | return false; |
1481 | ||
1482 | slen = size_binop_loc (loc, PLUS_EXPR, slen, ssize_int (1)); | |
1483 | ||
1484 | /* We do not support simplification of this case, though we do | |
1485 | support it when expanding trees into RTL. */ | |
1486 | /* FIXME: generate a call to __builtin_memset. */ | |
1487 | if (tree_int_cst_lt (slen, len)) | |
1488 | return false; | |
1489 | ||
1490 | /* OK transform into builtin memcpy. */ | |
1491 | fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
1492 | if (!fn) | |
1493 | return false; | |
1494 | ||
1495 | len = fold_convert_loc (loc, size_type_node, len); | |
1496 | len = force_gimple_operand_gsi (gsi, len, true, | |
1497 | NULL_TREE, true, GSI_SAME_STMT); | |
1498 | gimple repl = gimple_build_call (fn, 3, dest, src, len); | |
1499 | replace_call_with_call_and_fold (gsi, repl); | |
1500 | return true; | |
1501 | } | |
1502 | ||
1503 | /* Simplify a call to the strcat builtin. DST and SRC are the arguments | |
1504 | to the call. | |
1505 | ||
1506 | Return NULL_TREE if no simplification was possible, otherwise return the | |
1507 | simplified form of the call as a tree. | |
1508 | ||
1509 | The simplified form may be a constant or other expression which | |
1510 | computes the same value, but in a more efficient manner (including | |
1511 | calls to other builtin functions). | |
1512 | ||
1513 | The call may contain arguments which need to be evaluated, but | |
1514 | which are not useful to determine the result of the call. In | |
1515 | this case we return a chain of COMPOUND_EXPRs. The LHS of each | |
1516 | COMPOUND_EXPR will be an argument which must be evaluated. | |
1517 | COMPOUND_EXPRs are chained through their RHS. The RHS of the last | |
1518 | COMPOUND_EXPR in the chain will contain the tree for the simplified | |
1519 | form of the builtin function call. */ | |
1520 | ||
1521 | static bool | |
dcb7fae2 | 1522 | gimple_fold_builtin_strcat (gimple_stmt_iterator *gsi, tree dst, tree src) |
fef5a0d9 RB |
1523 | { |
1524 | gimple stmt = gsi_stmt (*gsi); | |
dcb7fae2 | 1525 | location_t loc = gimple_location (stmt); |
fef5a0d9 RB |
1526 | |
1527 | const char *p = c_getstr (src); | |
1528 | ||
1529 | /* If the string length is zero, return the dst parameter. */ | |
1530 | if (p && *p == '\0') | |
1531 | { | |
1532 | replace_call_with_value (gsi, dst); | |
1533 | return true; | |
1534 | } | |
1535 | ||
1536 | if (!optimize_bb_for_speed_p (gimple_bb (stmt))) | |
1537 | return false; | |
1538 | ||
1539 | /* See if we can store by pieces into (dst + strlen(dst)). */ | |
1540 | tree newdst; | |
1541 | tree strlen_fn = builtin_decl_implicit (BUILT_IN_STRLEN); | |
1542 | tree memcpy_fn = builtin_decl_implicit (BUILT_IN_MEMCPY); | |
1543 | ||
1544 | if (!strlen_fn || !memcpy_fn) | |
1545 | return false; | |
1546 | ||
1547 | /* If the length of the source string isn't computable don't | |
1548 | split strcat into strlen and memcpy. */ | |
dcb7fae2 | 1549 | tree len = get_maxval_strlen (src, 0); |
fef5a0d9 | 1550 | if (! len) |
fef5a0d9 RB |
1551 | return false; |
1552 | ||
1553 | /* Create strlen (dst). */ | |
1554 | gimple_seq stmts = NULL, stmts2; | |
1555 | gimple repl = gimple_build_call (strlen_fn, 1, dst); | |
1556 | gimple_set_location (repl, loc); | |
1557 | if (gimple_in_ssa_p (cfun)) | |
1558 | newdst = make_ssa_name (size_type_node, NULL); | |
1559 | else | |
1560 | newdst = create_tmp_reg (size_type_node, NULL); | |
1561 | gimple_call_set_lhs (repl, newdst); | |
1562 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
1563 | ||
1564 | /* Create (dst p+ strlen (dst)). */ | |
1565 | newdst = fold_build_pointer_plus_loc (loc, dst, newdst); | |
1566 | newdst = force_gimple_operand (newdst, &stmts2, true, NULL_TREE); | |
1567 | gimple_seq_add_seq_without_update (&stmts, stmts2); | |
1568 | ||
1569 | len = fold_convert_loc (loc, size_type_node, len); | |
1570 | len = size_binop_loc (loc, PLUS_EXPR, len, | |
1571 | build_int_cst (size_type_node, 1)); | |
1572 | len = force_gimple_operand (len, &stmts2, true, NULL_TREE); | |
1573 | gimple_seq_add_seq_without_update (&stmts, stmts2); | |
1574 | ||
1575 | repl = gimple_build_call (memcpy_fn, 3, newdst, src, len); | |
1576 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
1577 | if (gimple_call_lhs (stmt)) | |
1578 | { | |
1579 | repl = gimple_build_assign (gimple_call_lhs (stmt), dst); | |
1580 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
1581 | gsi_replace_with_seq_vops (gsi, stmts); | |
1582 | /* gsi now points at the assignment to the lhs, get a | |
1583 | stmt iterator to the memcpy call. | |
1584 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
1585 | CFG isn't built yet. */ | |
1586 | gimple_stmt_iterator gsi2 = *gsi; | |
1587 | gsi_prev (&gsi2); | |
1588 | fold_stmt (&gsi2); | |
1589 | } | |
1590 | else | |
1591 | { | |
1592 | gsi_replace_with_seq_vops (gsi, stmts); | |
1593 | fold_stmt (gsi); | |
1594 | } | |
1595 | return true; | |
1596 | } | |
1597 | ||
07f1cf56 RB |
1598 | /* Fold a call to the __strcat_chk builtin FNDECL. DEST, SRC, and SIZE |
1599 | are the arguments to the call. */ | |
1600 | ||
1601 | static bool | |
1602 | gimple_fold_builtin_strcat_chk (gimple_stmt_iterator *gsi) | |
1603 | { | |
1604 | gimple stmt = gsi_stmt (*gsi); | |
1605 | tree dest = gimple_call_arg (stmt, 0); | |
1606 | tree src = gimple_call_arg (stmt, 1); | |
1607 | tree size = gimple_call_arg (stmt, 2); | |
1608 | tree fn; | |
1609 | const char *p; | |
1610 | ||
1611 | ||
1612 | p = c_getstr (src); | |
1613 | /* If the SRC parameter is "", return DEST. */ | |
1614 | if (p && *p == '\0') | |
1615 | { | |
1616 | replace_call_with_value (gsi, dest); | |
1617 | return true; | |
1618 | } | |
1619 | ||
1620 | if (! tree_fits_uhwi_p (size) || ! integer_all_onesp (size)) | |
1621 | return false; | |
1622 | ||
1623 | /* If __builtin_strcat_chk is used, assume strcat is available. */ | |
1624 | fn = builtin_decl_explicit (BUILT_IN_STRCAT); | |
1625 | if (!fn) | |
1626 | return false; | |
1627 | ||
1628 | gimple repl = gimple_build_call (fn, 2, dest, src); | |
1629 | replace_call_with_call_and_fold (gsi, repl); | |
1630 | return true; | |
1631 | } | |
1632 | ||
745583f9 RB |
1633 | /* Fold a call to the __strncat_chk builtin with arguments DEST, SRC, |
1634 | LEN, and SIZE. */ | |
1635 | ||
1636 | static bool | |
1637 | gimple_fold_builtin_strncat_chk (gimple_stmt_iterator *gsi) | |
1638 | { | |
1639 | gimple stmt = gsi_stmt (*gsi); | |
1640 | tree dest = gimple_call_arg (stmt, 0); | |
1641 | tree src = gimple_call_arg (stmt, 1); | |
1642 | tree len = gimple_call_arg (stmt, 2); | |
1643 | tree size = gimple_call_arg (stmt, 3); | |
1644 | tree fn; | |
1645 | const char *p; | |
1646 | ||
1647 | p = c_getstr (src); | |
1648 | /* If the SRC parameter is "" or if LEN is 0, return DEST. */ | |
1649 | if ((p && *p == '\0') | |
1650 | || integer_zerop (len)) | |
1651 | { | |
1652 | replace_call_with_value (gsi, dest); | |
1653 | return true; | |
1654 | } | |
1655 | ||
1656 | if (! tree_fits_uhwi_p (size)) | |
1657 | return false; | |
1658 | ||
1659 | if (! integer_all_onesp (size)) | |
1660 | { | |
1661 | tree src_len = c_strlen (src, 1); | |
1662 | if (src_len | |
1663 | && tree_fits_uhwi_p (src_len) | |
1664 | && tree_fits_uhwi_p (len) | |
1665 | && ! tree_int_cst_lt (len, src_len)) | |
1666 | { | |
1667 | /* If LEN >= strlen (SRC), optimize into __strcat_chk. */ | |
1668 | fn = builtin_decl_explicit (BUILT_IN_STRCAT_CHK); | |
1669 | if (!fn) | |
1670 | return false; | |
1671 | ||
1672 | gimple repl = gimple_build_call (fn, 3, dest, src, size); | |
1673 | replace_call_with_call_and_fold (gsi, repl); | |
1674 | return true; | |
1675 | } | |
1676 | return false; | |
1677 | } | |
1678 | ||
1679 | /* If __builtin_strncat_chk is used, assume strncat is available. */ | |
1680 | fn = builtin_decl_explicit (BUILT_IN_STRNCAT); | |
1681 | if (!fn) | |
1682 | return false; | |
1683 | ||
1684 | gimple repl = gimple_build_call (fn, 3, dest, src, len); | |
1685 | replace_call_with_call_and_fold (gsi, repl); | |
1686 | return true; | |
1687 | } | |
1688 | ||
fef5a0d9 RB |
1689 | /* Fold a call to the fputs builtin. ARG0 and ARG1 are the arguments |
1690 | to the call. IGNORE is true if the value returned | |
1691 | by the builtin will be ignored. UNLOCKED is true is true if this | |
1692 | actually a call to fputs_unlocked. If LEN in non-NULL, it represents | |
1693 | the known length of the string. Return NULL_TREE if no simplification | |
1694 | was possible. */ | |
1695 | ||
1696 | static bool | |
1697 | gimple_fold_builtin_fputs (gimple_stmt_iterator *gsi, | |
fef5a0d9 | 1698 | tree arg0, tree arg1, |
dcb7fae2 | 1699 | bool unlocked) |
fef5a0d9 | 1700 | { |
dcb7fae2 RB |
1701 | gimple stmt = gsi_stmt (*gsi); |
1702 | ||
fef5a0d9 RB |
1703 | /* If we're using an unlocked function, assume the other unlocked |
1704 | functions exist explicitly. */ | |
1705 | tree const fn_fputc = (unlocked | |
1706 | ? builtin_decl_explicit (BUILT_IN_FPUTC_UNLOCKED) | |
1707 | : builtin_decl_implicit (BUILT_IN_FPUTC)); | |
1708 | tree const fn_fwrite = (unlocked | |
1709 | ? builtin_decl_explicit (BUILT_IN_FWRITE_UNLOCKED) | |
1710 | : builtin_decl_implicit (BUILT_IN_FWRITE)); | |
1711 | ||
1712 | /* If the return value is used, don't do the transformation. */ | |
dcb7fae2 | 1713 | if (gimple_call_lhs (stmt)) |
fef5a0d9 RB |
1714 | return false; |
1715 | ||
fef5a0d9 RB |
1716 | /* Get the length of the string passed to fputs. If the length |
1717 | can't be determined, punt. */ | |
dcb7fae2 | 1718 | tree len = get_maxval_strlen (arg0, 0); |
fef5a0d9 RB |
1719 | if (!len |
1720 | || TREE_CODE (len) != INTEGER_CST) | |
1721 | return false; | |
1722 | ||
1723 | switch (compare_tree_int (len, 1)) | |
1724 | { | |
1725 | case -1: /* length is 0, delete the call entirely . */ | |
1726 | replace_call_with_value (gsi, integer_zero_node); | |
1727 | return true; | |
1728 | ||
1729 | case 0: /* length is 1, call fputc. */ | |
1730 | { | |
1731 | const char *p = c_getstr (arg0); | |
1732 | if (p != NULL) | |
1733 | { | |
1734 | if (!fn_fputc) | |
1735 | return false; | |
1736 | ||
1737 | gimple repl = gimple_build_call (fn_fputc, 2, | |
1738 | build_int_cst | |
1739 | (integer_type_node, p[0]), arg1); | |
1740 | replace_call_with_call_and_fold (gsi, repl); | |
1741 | return true; | |
1742 | } | |
1743 | } | |
1744 | /* FALLTHROUGH */ | |
1745 | case 1: /* length is greater than 1, call fwrite. */ | |
1746 | { | |
1747 | /* If optimizing for size keep fputs. */ | |
1748 | if (optimize_function_for_size_p (cfun)) | |
1749 | return false; | |
1750 | /* New argument list transforming fputs(string, stream) to | |
1751 | fwrite(string, 1, len, stream). */ | |
1752 | if (!fn_fwrite) | |
1753 | return false; | |
1754 | ||
1755 | gimple repl = gimple_build_call (fn_fwrite, 4, arg0, | |
1756 | size_one_node, len, arg1); | |
1757 | replace_call_with_call_and_fold (gsi, repl); | |
1758 | return true; | |
1759 | } | |
1760 | default: | |
1761 | gcc_unreachable (); | |
1762 | } | |
1763 | return false; | |
1764 | } | |
1765 | ||
1766 | /* Fold a call to the __mem{cpy,pcpy,move,set}_chk builtin. | |
1767 | DEST, SRC, LEN, and SIZE are the arguments to the call. | |
1768 | IGNORE is true, if return value can be ignored. FCODE is the BUILT_IN_* | |
1769 | code of the builtin. If MAXLEN is not NULL, it is maximum length | |
1770 | passed as third argument. */ | |
1771 | ||
1772 | static bool | |
1773 | gimple_fold_builtin_memory_chk (gimple_stmt_iterator *gsi, | |
fef5a0d9 | 1774 | tree dest, tree src, tree len, tree size, |
fef5a0d9 RB |
1775 | enum built_in_function fcode) |
1776 | { | |
dcb7fae2 RB |
1777 | gimple stmt = gsi_stmt (*gsi); |
1778 | location_t loc = gimple_location (stmt); | |
1779 | bool ignore = gimple_call_lhs (stmt) == NULL_TREE; | |
fef5a0d9 RB |
1780 | tree fn; |
1781 | ||
1782 | /* If SRC and DEST are the same (and not volatile), return DEST | |
1783 | (resp. DEST+LEN for __mempcpy_chk). */ | |
1784 | if (fcode != BUILT_IN_MEMSET_CHK && operand_equal_p (src, dest, 0)) | |
1785 | { | |
1786 | if (fcode != BUILT_IN_MEMPCPY_CHK) | |
1787 | { | |
1788 | replace_call_with_value (gsi, dest); | |
1789 | return true; | |
1790 | } | |
1791 | else | |
1792 | { | |
1793 | tree temp = fold_build_pointer_plus_loc (loc, dest, len); | |
1794 | temp = force_gimple_operand_gsi (gsi, temp, | |
1795 | false, NULL_TREE, true, | |
1796 | GSI_SAME_STMT); | |
1797 | replace_call_with_value (gsi, temp); | |
1798 | return true; | |
1799 | } | |
1800 | } | |
1801 | ||
1802 | if (! tree_fits_uhwi_p (size)) | |
1803 | return false; | |
1804 | ||
dcb7fae2 | 1805 | tree maxlen = get_maxval_strlen (len, 2); |
fef5a0d9 RB |
1806 | if (! integer_all_onesp (size)) |
1807 | { | |
1808 | if (! tree_fits_uhwi_p (len)) | |
1809 | { | |
1810 | /* If LEN is not constant, try MAXLEN too. | |
1811 | For MAXLEN only allow optimizing into non-_ocs function | |
1812 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
1813 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
1814 | { | |
1815 | if (fcode == BUILT_IN_MEMPCPY_CHK && ignore) | |
1816 | { | |
1817 | /* (void) __mempcpy_chk () can be optimized into | |
1818 | (void) __memcpy_chk (). */ | |
1819 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK); | |
1820 | if (!fn) | |
1821 | return false; | |
1822 | ||
1823 | gimple repl = gimple_build_call (fn, 4, dest, src, len, size); | |
1824 | replace_call_with_call_and_fold (gsi, repl); | |
1825 | return true; | |
1826 | } | |
1827 | return false; | |
1828 | } | |
1829 | } | |
1830 | else | |
1831 | maxlen = len; | |
1832 | ||
1833 | if (tree_int_cst_lt (size, maxlen)) | |
1834 | return false; | |
1835 | } | |
1836 | ||
1837 | fn = NULL_TREE; | |
1838 | /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume | |
1839 | mem{cpy,pcpy,move,set} is available. */ | |
1840 | switch (fcode) | |
1841 | { | |
1842 | case BUILT_IN_MEMCPY_CHK: | |
1843 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY); | |
1844 | break; | |
1845 | case BUILT_IN_MEMPCPY_CHK: | |
1846 | fn = builtin_decl_explicit (BUILT_IN_MEMPCPY); | |
1847 | break; | |
1848 | case BUILT_IN_MEMMOVE_CHK: | |
1849 | fn = builtin_decl_explicit (BUILT_IN_MEMMOVE); | |
1850 | break; | |
1851 | case BUILT_IN_MEMSET_CHK: | |
1852 | fn = builtin_decl_explicit (BUILT_IN_MEMSET); | |
1853 | break; | |
1854 | default: | |
1855 | break; | |
1856 | } | |
1857 | ||
1858 | if (!fn) | |
1859 | return false; | |
1860 | ||
1861 | gimple repl = gimple_build_call (fn, 3, dest, src, len); | |
1862 | replace_call_with_call_and_fold (gsi, repl); | |
1863 | return true; | |
1864 | } | |
1865 | ||
1866 | /* Fold a call to the __st[rp]cpy_chk builtin. | |
1867 | DEST, SRC, and SIZE are the arguments to the call. | |
1868 | IGNORE is true if return value can be ignored. FCODE is the BUILT_IN_* | |
1869 | code of the builtin. If MAXLEN is not NULL, it is maximum length of | |
1870 | strings passed as second argument. */ | |
1871 | ||
1872 | static bool | |
1873 | gimple_fold_builtin_stxcpy_chk (gimple_stmt_iterator *gsi, | |
dcb7fae2 | 1874 | tree dest, |
fef5a0d9 | 1875 | tree src, tree size, |
fef5a0d9 RB |
1876 | enum built_in_function fcode) |
1877 | { | |
dcb7fae2 RB |
1878 | gimple stmt = gsi_stmt (*gsi); |
1879 | location_t loc = gimple_location (stmt); | |
1880 | bool ignore = gimple_call_lhs (stmt) == NULL_TREE; | |
fef5a0d9 RB |
1881 | tree len, fn; |
1882 | ||
1883 | /* If SRC and DEST are the same (and not volatile), return DEST. */ | |
1884 | if (fcode == BUILT_IN_STRCPY_CHK && operand_equal_p (src, dest, 0)) | |
1885 | { | |
1886 | replace_call_with_value (gsi, dest); | |
1887 | return true; | |
1888 | } | |
1889 | ||
1890 | if (! tree_fits_uhwi_p (size)) | |
1891 | return false; | |
1892 | ||
dcb7fae2 | 1893 | tree maxlen = get_maxval_strlen (src, 1); |
fef5a0d9 RB |
1894 | if (! integer_all_onesp (size)) |
1895 | { | |
1896 | len = c_strlen (src, 1); | |
1897 | if (! len || ! tree_fits_uhwi_p (len)) | |
1898 | { | |
1899 | /* If LEN is not constant, try MAXLEN too. | |
1900 | For MAXLEN only allow optimizing into non-_ocs function | |
1901 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
1902 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
1903 | { | |
1904 | if (fcode == BUILT_IN_STPCPY_CHK) | |
1905 | { | |
1906 | if (! ignore) | |
1907 | return false; | |
1908 | ||
1909 | /* If return value of __stpcpy_chk is ignored, | |
1910 | optimize into __strcpy_chk. */ | |
1911 | fn = builtin_decl_explicit (BUILT_IN_STRCPY_CHK); | |
1912 | if (!fn) | |
1913 | return false; | |
1914 | ||
1915 | gimple repl = gimple_build_call (fn, 3, dest, src, size); | |
1916 | replace_call_with_call_and_fold (gsi, repl); | |
1917 | return true; | |
1918 | } | |
1919 | ||
1920 | if (! len || TREE_SIDE_EFFECTS (len)) | |
1921 | return false; | |
1922 | ||
1923 | /* If c_strlen returned something, but not a constant, | |
1924 | transform __strcpy_chk into __memcpy_chk. */ | |
1925 | fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK); | |
1926 | if (!fn) | |
1927 | return false; | |
1928 | ||
1929 | len = fold_convert_loc (loc, size_type_node, len); | |
1930 | len = size_binop_loc (loc, PLUS_EXPR, len, | |
1931 | build_int_cst (size_type_node, 1)); | |
1932 | len = force_gimple_operand_gsi (gsi, len, true, NULL_TREE, | |
1933 | true, GSI_SAME_STMT); | |
1934 | gimple repl = gimple_build_call (fn, 4, dest, src, len, size); | |
1935 | replace_call_with_call_and_fold (gsi, repl); | |
1936 | return true; | |
1937 | } | |
e256dfce | 1938 | } |
fef5a0d9 RB |
1939 | else |
1940 | maxlen = len; | |
1941 | ||
1942 | if (! tree_int_cst_lt (maxlen, size)) | |
1943 | return false; | |
e256dfce RG |
1944 | } |
1945 | ||
fef5a0d9 RB |
1946 | /* If __builtin_st{r,p}cpy_chk is used, assume st{r,p}cpy is available. */ |
1947 | fn = builtin_decl_explicit (fcode == BUILT_IN_STPCPY_CHK | |
1948 | ? BUILT_IN_STPCPY : BUILT_IN_STRCPY); | |
1949 | if (!fn) | |
1950 | return false; | |
1951 | ||
1952 | gimple repl = gimple_build_call (fn, 2, dest, src); | |
1953 | replace_call_with_call_and_fold (gsi, repl); | |
1954 | return true; | |
1955 | } | |
1956 | ||
1957 | /* Fold a call to the __st{r,p}ncpy_chk builtin. DEST, SRC, LEN, and SIZE | |
1958 | are the arguments to the call. If MAXLEN is not NULL, it is maximum | |
1959 | length passed as third argument. IGNORE is true if return value can be | |
1960 | ignored. FCODE is the BUILT_IN_* code of the builtin. */ | |
1961 | ||
1962 | static bool | |
1963 | gimple_fold_builtin_stxncpy_chk (gimple_stmt_iterator *gsi, | |
1964 | tree dest, tree src, | |
dcb7fae2 | 1965 | tree len, tree size, |
fef5a0d9 RB |
1966 | enum built_in_function fcode) |
1967 | { | |
dcb7fae2 RB |
1968 | gimple stmt = gsi_stmt (*gsi); |
1969 | bool ignore = gimple_call_lhs (stmt) == NULL_TREE; | |
fef5a0d9 RB |
1970 | tree fn; |
1971 | ||
1972 | if (fcode == BUILT_IN_STPNCPY_CHK && ignore) | |
cbdd87d4 | 1973 | { |
fef5a0d9 RB |
1974 | /* If return value of __stpncpy_chk is ignored, |
1975 | optimize into __strncpy_chk. */ | |
1976 | fn = builtin_decl_explicit (BUILT_IN_STRNCPY_CHK); | |
1977 | if (fn) | |
1978 | { | |
1979 | gimple repl = gimple_build_call (fn, 4, dest, src, len, size); | |
1980 | replace_call_with_call_and_fold (gsi, repl); | |
1981 | return true; | |
1982 | } | |
cbdd87d4 RG |
1983 | } |
1984 | ||
fef5a0d9 RB |
1985 | if (! tree_fits_uhwi_p (size)) |
1986 | return false; | |
1987 | ||
dcb7fae2 | 1988 | tree maxlen = get_maxval_strlen (len, 2); |
fef5a0d9 | 1989 | if (! integer_all_onesp (size)) |
cbdd87d4 | 1990 | { |
fef5a0d9 | 1991 | if (! tree_fits_uhwi_p (len)) |
fe2ef088 | 1992 | { |
fef5a0d9 RB |
1993 | /* If LEN is not constant, try MAXLEN too. |
1994 | For MAXLEN only allow optimizing into non-_ocs function | |
1995 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
1996 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
1997 | return false; | |
8a1561bc | 1998 | } |
fef5a0d9 RB |
1999 | else |
2000 | maxlen = len; | |
2001 | ||
2002 | if (tree_int_cst_lt (size, maxlen)) | |
2003 | return false; | |
cbdd87d4 RG |
2004 | } |
2005 | ||
fef5a0d9 RB |
2006 | /* If __builtin_st{r,p}ncpy_chk is used, assume st{r,p}ncpy is available. */ |
2007 | fn = builtin_decl_explicit (fcode == BUILT_IN_STPNCPY_CHK | |
2008 | ? BUILT_IN_STPNCPY : BUILT_IN_STRNCPY); | |
2009 | if (!fn) | |
2010 | return false; | |
2011 | ||
2012 | gimple repl = gimple_build_call (fn, 3, dest, src, len); | |
2013 | replace_call_with_call_and_fold (gsi, repl); | |
2014 | return true; | |
cbdd87d4 RG |
2015 | } |
2016 | ||
fef5a0d9 RB |
2017 | /* Fold a call EXP to {,v}snprintf having NARGS passed as ARGS. Return |
2018 | NULL_TREE if a normal call should be emitted rather than expanding | |
2019 | the function inline. FCODE is either BUILT_IN_SNPRINTF_CHK or | |
2020 | BUILT_IN_VSNPRINTF_CHK. If MAXLEN is not NULL, it is maximum length | |
2021 | passed as second argument. */ | |
cbdd87d4 RG |
2022 | |
2023 | static bool | |
fef5a0d9 | 2024 | gimple_fold_builtin_snprintf_chk (gimple_stmt_iterator *gsi, |
dcb7fae2 | 2025 | enum built_in_function fcode) |
cbdd87d4 | 2026 | { |
fef5a0d9 RB |
2027 | gimple stmt = gsi_stmt (*gsi); |
2028 | tree dest, size, len, fn, fmt, flag; | |
2029 | const char *fmt_str; | |
cbdd87d4 | 2030 | |
fef5a0d9 RB |
2031 | /* Verify the required arguments in the original call. */ |
2032 | if (gimple_call_num_args (stmt) < 5) | |
2033 | return false; | |
cbdd87d4 | 2034 | |
fef5a0d9 RB |
2035 | dest = gimple_call_arg (stmt, 0); |
2036 | len = gimple_call_arg (stmt, 1); | |
2037 | flag = gimple_call_arg (stmt, 2); | |
2038 | size = gimple_call_arg (stmt, 3); | |
2039 | fmt = gimple_call_arg (stmt, 4); | |
2040 | ||
2041 | if (! tree_fits_uhwi_p (size)) | |
2042 | return false; | |
2043 | ||
2044 | if (! integer_all_onesp (size)) | |
2045 | { | |
dcb7fae2 | 2046 | tree maxlen = get_maxval_strlen (len, 2); |
fef5a0d9 | 2047 | if (! tree_fits_uhwi_p (len)) |
cbdd87d4 | 2048 | { |
fef5a0d9 RB |
2049 | /* If LEN is not constant, try MAXLEN too. |
2050 | For MAXLEN only allow optimizing into non-_ocs function | |
2051 | if SIZE is >= MAXLEN, never convert to __ocs_fail (). */ | |
2052 | if (maxlen == NULL_TREE || ! tree_fits_uhwi_p (maxlen)) | |
cbdd87d4 RG |
2053 | return false; |
2054 | } | |
2055 | else | |
fef5a0d9 | 2056 | maxlen = len; |
cbdd87d4 | 2057 | |
fef5a0d9 RB |
2058 | if (tree_int_cst_lt (size, maxlen)) |
2059 | return false; | |
2060 | } | |
cbdd87d4 | 2061 | |
fef5a0d9 RB |
2062 | if (!init_target_chars ()) |
2063 | return false; | |
cbdd87d4 | 2064 | |
fef5a0d9 RB |
2065 | /* Only convert __{,v}snprintf_chk to {,v}snprintf if flag is 0 |
2066 | or if format doesn't contain % chars or is "%s". */ | |
2067 | if (! integer_zerop (flag)) | |
2068 | { | |
2069 | fmt_str = c_getstr (fmt); | |
2070 | if (fmt_str == NULL) | |
2071 | return false; | |
2072 | if (strchr (fmt_str, target_percent) != NULL | |
2073 | && strcmp (fmt_str, target_percent_s)) | |
2074 | return false; | |
cbdd87d4 RG |
2075 | } |
2076 | ||
fef5a0d9 RB |
2077 | /* If __builtin_{,v}snprintf_chk is used, assume {,v}snprintf is |
2078 | available. */ | |
2079 | fn = builtin_decl_explicit (fcode == BUILT_IN_VSNPRINTF_CHK | |
2080 | ? BUILT_IN_VSNPRINTF : BUILT_IN_SNPRINTF); | |
2081 | if (!fn) | |
491e0b9b RG |
2082 | return false; |
2083 | ||
fef5a0d9 RB |
2084 | /* Replace the called function and the first 5 argument by 3 retaining |
2085 | trailing varargs. */ | |
2086 | gimple_call_set_fndecl (stmt, fn); | |
2087 | gimple_call_set_fntype (stmt, TREE_TYPE (fn)); | |
2088 | gimple_call_set_arg (stmt, 0, dest); | |
2089 | gimple_call_set_arg (stmt, 1, len); | |
2090 | gimple_call_set_arg (stmt, 2, fmt); | |
2091 | for (unsigned i = 3; i < gimple_call_num_args (stmt) - 2; ++i) | |
2092 | gimple_call_set_arg (stmt, i, gimple_call_arg (stmt, i + 2)); | |
2093 | gimple_set_num_ops (stmt, gimple_num_ops (stmt) - 2); | |
2094 | fold_stmt (gsi); | |
2095 | return true; | |
2096 | } | |
cbdd87d4 | 2097 | |
fef5a0d9 RB |
2098 | /* Fold a call EXP to __{,v}sprintf_chk having NARGS passed as ARGS. |
2099 | Return NULL_TREE if a normal call should be emitted rather than | |
2100 | expanding the function inline. FCODE is either BUILT_IN_SPRINTF_CHK | |
2101 | or BUILT_IN_VSPRINTF_CHK. */ | |
cbdd87d4 | 2102 | |
fef5a0d9 RB |
2103 | static bool |
2104 | gimple_fold_builtin_sprintf_chk (gimple_stmt_iterator *gsi, | |
2105 | enum built_in_function fcode) | |
2106 | { | |
2107 | gimple stmt = gsi_stmt (*gsi); | |
2108 | tree dest, size, len, fn, fmt, flag; | |
2109 | const char *fmt_str; | |
2110 | unsigned nargs = gimple_call_num_args (stmt); | |
cbdd87d4 | 2111 | |
fef5a0d9 RB |
2112 | /* Verify the required arguments in the original call. */ |
2113 | if (nargs < 4) | |
2114 | return false; | |
2115 | dest = gimple_call_arg (stmt, 0); | |
2116 | flag = gimple_call_arg (stmt, 1); | |
2117 | size = gimple_call_arg (stmt, 2); | |
2118 | fmt = gimple_call_arg (stmt, 3); | |
2119 | ||
2120 | if (! tree_fits_uhwi_p (size)) | |
2121 | return false; | |
2122 | ||
2123 | len = NULL_TREE; | |
2124 | ||
2125 | if (!init_target_chars ()) | |
2126 | return false; | |
2127 | ||
2128 | /* Check whether the format is a literal string constant. */ | |
2129 | fmt_str = c_getstr (fmt); | |
2130 | if (fmt_str != NULL) | |
2131 | { | |
2132 | /* If the format doesn't contain % args or %%, we know the size. */ | |
2133 | if (strchr (fmt_str, target_percent) == 0) | |
cbdd87d4 | 2134 | { |
fef5a0d9 RB |
2135 | if (fcode != BUILT_IN_SPRINTF_CHK || nargs == 4) |
2136 | len = build_int_cstu (size_type_node, strlen (fmt_str)); | |
2137 | } | |
2138 | /* If the format is "%s" and first ... argument is a string literal, | |
2139 | we know the size too. */ | |
2140 | else if (fcode == BUILT_IN_SPRINTF_CHK | |
2141 | && strcmp (fmt_str, target_percent_s) == 0) | |
2142 | { | |
2143 | tree arg; | |
cbdd87d4 | 2144 | |
fef5a0d9 RB |
2145 | if (nargs == 5) |
2146 | { | |
2147 | arg = gimple_call_arg (stmt, 4); | |
2148 | if (POINTER_TYPE_P (TREE_TYPE (arg))) | |
2149 | { | |
2150 | len = c_strlen (arg, 1); | |
2151 | if (! len || ! tree_fits_uhwi_p (len)) | |
2152 | len = NULL_TREE; | |
2153 | } | |
2154 | } | |
2155 | } | |
2156 | } | |
cbdd87d4 | 2157 | |
fef5a0d9 RB |
2158 | if (! integer_all_onesp (size)) |
2159 | { | |
2160 | if (! len || ! tree_int_cst_lt (len, size)) | |
2161 | return false; | |
2162 | } | |
cbdd87d4 | 2163 | |
fef5a0d9 RB |
2164 | /* Only convert __{,v}sprintf_chk to {,v}sprintf if flag is 0 |
2165 | or if format doesn't contain % chars or is "%s". */ | |
2166 | if (! integer_zerop (flag)) | |
2167 | { | |
2168 | if (fmt_str == NULL) | |
2169 | return false; | |
2170 | if (strchr (fmt_str, target_percent) != NULL | |
2171 | && strcmp (fmt_str, target_percent_s)) | |
2172 | return false; | |
2173 | } | |
cbdd87d4 | 2174 | |
fef5a0d9 RB |
2175 | /* If __builtin_{,v}sprintf_chk is used, assume {,v}sprintf is available. */ |
2176 | fn = builtin_decl_explicit (fcode == BUILT_IN_VSPRINTF_CHK | |
2177 | ? BUILT_IN_VSPRINTF : BUILT_IN_SPRINTF); | |
2178 | if (!fn) | |
2179 | return false; | |
2180 | ||
2181 | /* Replace the called function and the first 4 argument by 2 retaining | |
2182 | trailing varargs. */ | |
2183 | gimple_call_set_fndecl (stmt, fn); | |
2184 | gimple_call_set_fntype (stmt, TREE_TYPE (fn)); | |
2185 | gimple_call_set_arg (stmt, 0, dest); | |
2186 | gimple_call_set_arg (stmt, 1, fmt); | |
2187 | for (unsigned i = 2; i < gimple_call_num_args (stmt) - 2; ++i) | |
2188 | gimple_call_set_arg (stmt, i, gimple_call_arg (stmt, i + 2)); | |
2189 | gimple_set_num_ops (stmt, gimple_num_ops (stmt) - 2); | |
2190 | fold_stmt (gsi); | |
2191 | return true; | |
2192 | } | |
2193 | ||
35770bb2 RB |
2194 | /* Simplify a call to the sprintf builtin with arguments DEST, FMT, and ORIG. |
2195 | ORIG may be null if this is a 2-argument call. We don't attempt to | |
2196 | simplify calls with more than 3 arguments. | |
2197 | ||
2198 | Return NULL_TREE if no simplification was possible, otherwise return the | |
2199 | simplified form of the call as a tree. If IGNORED is true, it means that | |
2200 | the caller does not use the returned value of the function. */ | |
2201 | ||
2202 | static bool | |
dcb7fae2 | 2203 | gimple_fold_builtin_sprintf (gimple_stmt_iterator *gsi) |
35770bb2 RB |
2204 | { |
2205 | gimple stmt = gsi_stmt (*gsi); | |
2206 | tree dest = gimple_call_arg (stmt, 0); | |
2207 | tree fmt = gimple_call_arg (stmt, 1); | |
2208 | tree orig = NULL_TREE; | |
2209 | const char *fmt_str = NULL; | |
2210 | ||
2211 | /* Verify the required arguments in the original call. We deal with two | |
2212 | types of sprintf() calls: 'sprintf (str, fmt)' and | |
2213 | 'sprintf (dest, "%s", orig)'. */ | |
2214 | if (gimple_call_num_args (stmt) > 3) | |
2215 | return false; | |
2216 | ||
2217 | if (gimple_call_num_args (stmt) == 3) | |
2218 | orig = gimple_call_arg (stmt, 2); | |
2219 | ||
2220 | /* Check whether the format is a literal string constant. */ | |
2221 | fmt_str = c_getstr (fmt); | |
2222 | if (fmt_str == NULL) | |
2223 | return false; | |
2224 | ||
2225 | if (!init_target_chars ()) | |
2226 | return false; | |
2227 | ||
2228 | /* If the format doesn't contain % args or %%, use strcpy. */ | |
2229 | if (strchr (fmt_str, target_percent) == NULL) | |
2230 | { | |
2231 | tree fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
2232 | ||
2233 | if (!fn) | |
2234 | return false; | |
2235 | ||
2236 | /* Don't optimize sprintf (buf, "abc", ptr++). */ | |
2237 | if (orig) | |
2238 | return false; | |
2239 | ||
2240 | /* Convert sprintf (str, fmt) into strcpy (str, fmt) when | |
2241 | 'format' is known to contain no % formats. */ | |
2242 | gimple_seq stmts = NULL; | |
2243 | gimple repl = gimple_build_call (fn, 2, dest, fmt); | |
2244 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2245 | if (gimple_call_lhs (stmt)) | |
2246 | { | |
2247 | repl = gimple_build_assign (gimple_call_lhs (stmt), | |
2248 | build_int_cst (integer_type_node, | |
2249 | strlen (fmt_str))); | |
2250 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2251 | gsi_replace_with_seq_vops (gsi, stmts); | |
2252 | /* gsi now points at the assignment to the lhs, get a | |
2253 | stmt iterator to the memcpy call. | |
2254 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
2255 | CFG isn't built yet. */ | |
2256 | gimple_stmt_iterator gsi2 = *gsi; | |
2257 | gsi_prev (&gsi2); | |
2258 | fold_stmt (&gsi2); | |
2259 | } | |
2260 | else | |
2261 | { | |
2262 | gsi_replace_with_seq_vops (gsi, stmts); | |
2263 | fold_stmt (gsi); | |
2264 | } | |
2265 | return true; | |
2266 | } | |
2267 | ||
2268 | /* If the format is "%s", use strcpy if the result isn't used. */ | |
2269 | else if (fmt_str && strcmp (fmt_str, target_percent_s) == 0) | |
2270 | { | |
2271 | tree fn; | |
2272 | fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
2273 | ||
2274 | if (!fn) | |
2275 | return false; | |
2276 | ||
2277 | /* Don't crash on sprintf (str1, "%s"). */ | |
2278 | if (!orig) | |
2279 | return false; | |
2280 | ||
dcb7fae2 RB |
2281 | tree orig_len = NULL_TREE; |
2282 | if (gimple_call_lhs (stmt)) | |
35770bb2 | 2283 | { |
dcb7fae2 | 2284 | orig_len = get_maxval_strlen (orig, 0); |
d7e78447 | 2285 | if (!orig_len) |
35770bb2 RB |
2286 | return false; |
2287 | } | |
2288 | ||
2289 | /* Convert sprintf (str1, "%s", str2) into strcpy (str1, str2). */ | |
2290 | gimple_seq stmts = NULL; | |
2291 | gimple repl = gimple_build_call (fn, 2, dest, orig); | |
2292 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2293 | if (gimple_call_lhs (stmt)) | |
2294 | { | |
d7e78447 RB |
2295 | if (!useless_type_conversion_p (integer_type_node, |
2296 | TREE_TYPE (orig_len))) | |
2297 | orig_len = fold_convert (integer_type_node, orig_len); | |
2298 | repl = gimple_build_assign (gimple_call_lhs (stmt), orig_len); | |
35770bb2 RB |
2299 | gimple_seq_add_stmt_without_update (&stmts, repl); |
2300 | gsi_replace_with_seq_vops (gsi, stmts); | |
2301 | /* gsi now points at the assignment to the lhs, get a | |
2302 | stmt iterator to the memcpy call. | |
2303 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
2304 | CFG isn't built yet. */ | |
2305 | gimple_stmt_iterator gsi2 = *gsi; | |
2306 | gsi_prev (&gsi2); | |
2307 | fold_stmt (&gsi2); | |
2308 | } | |
2309 | else | |
2310 | { | |
2311 | gsi_replace_with_seq_vops (gsi, stmts); | |
2312 | fold_stmt (gsi); | |
2313 | } | |
2314 | return true; | |
2315 | } | |
2316 | return false; | |
2317 | } | |
2318 | ||
d7e78447 RB |
2319 | /* Simplify a call to the snprintf builtin with arguments DEST, DESTSIZE, |
2320 | FMT, and ORIG. ORIG may be null if this is a 3-argument call. We don't | |
2321 | attempt to simplify calls with more than 4 arguments. | |
35770bb2 | 2322 | |
d7e78447 RB |
2323 | Return NULL_TREE if no simplification was possible, otherwise return the |
2324 | simplified form of the call as a tree. If IGNORED is true, it means that | |
2325 | the caller does not use the returned value of the function. */ | |
2326 | ||
2327 | static bool | |
dcb7fae2 | 2328 | gimple_fold_builtin_snprintf (gimple_stmt_iterator *gsi) |
d7e78447 RB |
2329 | { |
2330 | gimple stmt = gsi_stmt (*gsi); | |
2331 | tree dest = gimple_call_arg (stmt, 0); | |
2332 | tree destsize = gimple_call_arg (stmt, 1); | |
2333 | tree fmt = gimple_call_arg (stmt, 2); | |
2334 | tree orig = NULL_TREE; | |
2335 | const char *fmt_str = NULL; | |
2336 | ||
2337 | if (gimple_call_num_args (stmt) > 4) | |
2338 | return false; | |
2339 | ||
2340 | if (gimple_call_num_args (stmt) == 4) | |
2341 | orig = gimple_call_arg (stmt, 3); | |
2342 | ||
2343 | if (!tree_fits_uhwi_p (destsize)) | |
2344 | return false; | |
2345 | unsigned HOST_WIDE_INT destlen = tree_to_uhwi (destsize); | |
2346 | ||
2347 | /* Check whether the format is a literal string constant. */ | |
2348 | fmt_str = c_getstr (fmt); | |
2349 | if (fmt_str == NULL) | |
2350 | return false; | |
2351 | ||
2352 | if (!init_target_chars ()) | |
2353 | return false; | |
2354 | ||
2355 | /* If the format doesn't contain % args or %%, use strcpy. */ | |
2356 | if (strchr (fmt_str, target_percent) == NULL) | |
2357 | { | |
2358 | tree fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
2359 | if (!fn) | |
2360 | return false; | |
2361 | ||
2362 | /* Don't optimize snprintf (buf, 4, "abc", ptr++). */ | |
2363 | if (orig) | |
2364 | return false; | |
2365 | ||
2366 | /* We could expand this as | |
2367 | memcpy (str, fmt, cst - 1); str[cst - 1] = '\0'; | |
2368 | or to | |
2369 | memcpy (str, fmt_with_nul_at_cstm1, cst); | |
2370 | but in the former case that might increase code size | |
2371 | and in the latter case grow .rodata section too much. | |
2372 | So punt for now. */ | |
2373 | size_t len = strlen (fmt_str); | |
2374 | if (len >= destlen) | |
2375 | return false; | |
2376 | ||
2377 | gimple_seq stmts = NULL; | |
2378 | gimple repl = gimple_build_call (fn, 2, dest, fmt); | |
2379 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2380 | if (gimple_call_lhs (stmt)) | |
2381 | { | |
2382 | repl = gimple_build_assign (gimple_call_lhs (stmt), | |
2383 | build_int_cst (integer_type_node, len)); | |
2384 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2385 | gsi_replace_with_seq_vops (gsi, stmts); | |
2386 | /* gsi now points at the assignment to the lhs, get a | |
2387 | stmt iterator to the memcpy call. | |
2388 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
2389 | CFG isn't built yet. */ | |
2390 | gimple_stmt_iterator gsi2 = *gsi; | |
2391 | gsi_prev (&gsi2); | |
2392 | fold_stmt (&gsi2); | |
2393 | } | |
2394 | else | |
2395 | { | |
2396 | gsi_replace_with_seq_vops (gsi, stmts); | |
2397 | fold_stmt (gsi); | |
2398 | } | |
2399 | return true; | |
2400 | } | |
2401 | ||
2402 | /* If the format is "%s", use strcpy if the result isn't used. */ | |
2403 | else if (fmt_str && strcmp (fmt_str, target_percent_s) == 0) | |
2404 | { | |
2405 | tree fn = builtin_decl_implicit (BUILT_IN_STRCPY); | |
2406 | if (!fn) | |
2407 | return false; | |
2408 | ||
2409 | /* Don't crash on snprintf (str1, cst, "%s"). */ | |
2410 | if (!orig) | |
2411 | return false; | |
2412 | ||
dcb7fae2 | 2413 | tree orig_len = get_maxval_strlen (orig, 0); |
d7e78447 | 2414 | if (!orig_len) |
dcb7fae2 | 2415 | return false; |
d7e78447 RB |
2416 | |
2417 | /* We could expand this as | |
2418 | memcpy (str1, str2, cst - 1); str1[cst - 1] = '\0'; | |
2419 | or to | |
2420 | memcpy (str1, str2_with_nul_at_cstm1, cst); | |
2421 | but in the former case that might increase code size | |
2422 | and in the latter case grow .rodata section too much. | |
2423 | So punt for now. */ | |
2424 | if (compare_tree_int (orig_len, destlen) >= 0) | |
2425 | return false; | |
2426 | ||
2427 | /* Convert snprintf (str1, cst, "%s", str2) into | |
2428 | strcpy (str1, str2) if strlen (str2) < cst. */ | |
2429 | gimple_seq stmts = NULL; | |
2430 | gimple repl = gimple_build_call (fn, 2, dest, orig); | |
2431 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2432 | if (gimple_call_lhs (stmt)) | |
2433 | { | |
2434 | if (!useless_type_conversion_p (integer_type_node, | |
2435 | TREE_TYPE (orig_len))) | |
2436 | orig_len = fold_convert (integer_type_node, orig_len); | |
2437 | repl = gimple_build_assign (gimple_call_lhs (stmt), orig_len); | |
2438 | gimple_seq_add_stmt_without_update (&stmts, repl); | |
2439 | gsi_replace_with_seq_vops (gsi, stmts); | |
2440 | /* gsi now points at the assignment to the lhs, get a | |
2441 | stmt iterator to the memcpy call. | |
2442 | ??? We can't use gsi_for_stmt as that doesn't work when the | |
2443 | CFG isn't built yet. */ | |
2444 | gimple_stmt_iterator gsi2 = *gsi; | |
2445 | gsi_prev (&gsi2); | |
2446 | fold_stmt (&gsi2); | |
2447 | } | |
2448 | else | |
2449 | { | |
2450 | gsi_replace_with_seq_vops (gsi, stmts); | |
2451 | fold_stmt (gsi); | |
2452 | } | |
2453 | return true; | |
2454 | } | |
2455 | return false; | |
2456 | } | |
35770bb2 | 2457 | |
fef5a0d9 RB |
2458 | |
2459 | /* Fold a call to __builtin_strlen with known length LEN. */ | |
2460 | ||
2461 | static bool | |
dcb7fae2 | 2462 | gimple_fold_builtin_strlen (gimple_stmt_iterator *gsi) |
fef5a0d9 | 2463 | { |
dcb7fae2 RB |
2464 | gimple stmt = gsi_stmt (*gsi); |
2465 | tree len = get_maxval_strlen (gimple_call_arg (stmt, 0), 0); | |
fef5a0d9 RB |
2466 | if (!len) |
2467 | return false; | |
2813904b | 2468 | len = force_gimple_operand_gsi (gsi, len, true, NULL, true, GSI_SAME_STMT); |
fef5a0d9 RB |
2469 | replace_call_with_value (gsi, len); |
2470 | return true; | |
cbdd87d4 RG |
2471 | } |
2472 | ||
2473 | ||
dcb7fae2 RB |
2474 | /* Fold the non-target builtin at *GSI and return whether any simplification |
2475 | was made. */ | |
cbdd87d4 | 2476 | |
fef5a0d9 | 2477 | static bool |
dcb7fae2 | 2478 | gimple_fold_builtin (gimple_stmt_iterator *gsi) |
cbdd87d4 | 2479 | { |
fef5a0d9 | 2480 | gimple stmt = gsi_stmt (*gsi); |
fef5a0d9 | 2481 | tree callee = gimple_call_fndecl (stmt); |
cbdd87d4 | 2482 | |
dcb7fae2 RB |
2483 | /* Give up for always_inline inline builtins until they are |
2484 | inlined. */ | |
2485 | if (avoid_folding_inline_builtin (callee)) | |
2486 | return false; | |
cbdd87d4 | 2487 | |
cbdd87d4 RG |
2488 | switch (DECL_FUNCTION_CODE (callee)) |
2489 | { | |
dcb7fae2 RB |
2490 | case BUILT_IN_BZERO: |
2491 | return gimple_fold_builtin_memset (gsi, integer_zero_node, | |
2492 | gimple_call_arg (stmt, 1)); | |
2493 | case BUILT_IN_MEMSET: | |
2494 | return gimple_fold_builtin_memset (gsi, | |
2495 | gimple_call_arg (stmt, 1), | |
2496 | gimple_call_arg (stmt, 2)); | |
2497 | case BUILT_IN_BCOPY: | |
2498 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 1), | |
2499 | gimple_call_arg (stmt, 0), 3); | |
2500 | case BUILT_IN_MEMCPY: | |
2501 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0), | |
2502 | gimple_call_arg (stmt, 1), 0); | |
2503 | case BUILT_IN_MEMPCPY: | |
2504 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0), | |
2505 | gimple_call_arg (stmt, 1), 1); | |
2506 | case BUILT_IN_MEMMOVE: | |
2507 | return gimple_fold_builtin_memory_op (gsi, gimple_call_arg (stmt, 0), | |
2508 | gimple_call_arg (stmt, 1), 3); | |
2509 | case BUILT_IN_SPRINTF_CHK: | |
2510 | case BUILT_IN_VSPRINTF_CHK: | |
2511 | return gimple_fold_builtin_sprintf_chk (gsi, DECL_FUNCTION_CODE (callee)); | |
2512 | case BUILT_IN_STRCAT_CHK: | |
2513 | return gimple_fold_builtin_strcat_chk (gsi); | |
745583f9 RB |
2514 | case BUILT_IN_STRNCAT_CHK: |
2515 | return gimple_fold_builtin_strncat_chk (gsi); | |
cbdd87d4 | 2516 | case BUILT_IN_STRLEN: |
dcb7fae2 | 2517 | return gimple_fold_builtin_strlen (gsi); |
cbdd87d4 | 2518 | case BUILT_IN_STRCPY: |
dcb7fae2 | 2519 | return gimple_fold_builtin_strcpy (gsi, |
fef5a0d9 | 2520 | gimple_call_arg (stmt, 0), |
dcb7fae2 | 2521 | gimple_call_arg (stmt, 1)); |
cbdd87d4 | 2522 | case BUILT_IN_STRNCPY: |
dcb7fae2 | 2523 | return gimple_fold_builtin_strncpy (gsi, |
fef5a0d9 RB |
2524 | gimple_call_arg (stmt, 0), |
2525 | gimple_call_arg (stmt, 1), | |
dcb7fae2 | 2526 | gimple_call_arg (stmt, 2)); |
9a7eefec | 2527 | case BUILT_IN_STRCAT: |
dcb7fae2 RB |
2528 | return gimple_fold_builtin_strcat (gsi, gimple_call_arg (stmt, 0), |
2529 | gimple_call_arg (stmt, 1)); | |
cbdd87d4 | 2530 | case BUILT_IN_FPUTS: |
dcb7fae2 RB |
2531 | return gimple_fold_builtin_fputs (gsi, gimple_call_arg (stmt, 0), |
2532 | gimple_call_arg (stmt, 1), false); | |
cbdd87d4 | 2533 | case BUILT_IN_FPUTS_UNLOCKED: |
dcb7fae2 RB |
2534 | return gimple_fold_builtin_fputs (gsi, gimple_call_arg (stmt, 0), |
2535 | gimple_call_arg (stmt, 1), true); | |
cbdd87d4 RG |
2536 | case BUILT_IN_MEMCPY_CHK: |
2537 | case BUILT_IN_MEMPCPY_CHK: | |
2538 | case BUILT_IN_MEMMOVE_CHK: | |
2539 | case BUILT_IN_MEMSET_CHK: | |
dcb7fae2 | 2540 | return gimple_fold_builtin_memory_chk (gsi, |
fef5a0d9 RB |
2541 | gimple_call_arg (stmt, 0), |
2542 | gimple_call_arg (stmt, 1), | |
2543 | gimple_call_arg (stmt, 2), | |
2544 | gimple_call_arg (stmt, 3), | |
fef5a0d9 | 2545 | DECL_FUNCTION_CODE (callee)); |
cbdd87d4 RG |
2546 | case BUILT_IN_STRCPY_CHK: |
2547 | case BUILT_IN_STPCPY_CHK: | |
dcb7fae2 | 2548 | return gimple_fold_builtin_stxcpy_chk (gsi, |
fef5a0d9 RB |
2549 | gimple_call_arg (stmt, 0), |
2550 | gimple_call_arg (stmt, 1), | |
2551 | gimple_call_arg (stmt, 2), | |
fef5a0d9 | 2552 | DECL_FUNCTION_CODE (callee)); |
cbdd87d4 | 2553 | case BUILT_IN_STRNCPY_CHK: |
f3fc9b80 | 2554 | case BUILT_IN_STPNCPY_CHK: |
fef5a0d9 RB |
2555 | return gimple_fold_builtin_stxncpy_chk (gsi, |
2556 | gimple_call_arg (stmt, 0), | |
2557 | gimple_call_arg (stmt, 1), | |
2558 | gimple_call_arg (stmt, 2), | |
2559 | gimple_call_arg (stmt, 3), | |
fef5a0d9 | 2560 | DECL_FUNCTION_CODE (callee)); |
cbdd87d4 RG |
2561 | case BUILT_IN_SNPRINTF_CHK: |
2562 | case BUILT_IN_VSNPRINTF_CHK: | |
dcb7fae2 | 2563 | return gimple_fold_builtin_snprintf_chk (gsi, |
fef5a0d9 | 2564 | DECL_FUNCTION_CODE (callee)); |
d7e78447 | 2565 | case BUILT_IN_SNPRINTF: |
dcb7fae2 | 2566 | return gimple_fold_builtin_snprintf (gsi); |
d7e78447 | 2567 | case BUILT_IN_SPRINTF: |
dcb7fae2 | 2568 | return gimple_fold_builtin_sprintf (gsi); |
fef5a0d9 RB |
2569 | default:; |
2570 | } | |
2571 | ||
2572 | /* Try the generic builtin folder. */ | |
2573 | bool ignore = (gimple_call_lhs (stmt) == NULL); | |
2574 | tree result = fold_call_stmt (stmt, ignore); | |
2575 | if (result) | |
2576 | { | |
2577 | if (ignore) | |
2578 | STRIP_NOPS (result); | |
2579 | else | |
2580 | result = fold_convert (gimple_call_return_type (stmt), result); | |
2581 | if (!update_call_from_tree (gsi, result)) | |
2582 | gimplify_and_update_call_from_tree (gsi, result); | |
2583 | return true; | |
2584 | } | |
2585 | ||
2586 | return false; | |
2587 | } | |
2588 | ||
cbdd87d4 RG |
2589 | /* Attempt to fold a call statement referenced by the statement iterator GSI. |
2590 | The statement may be replaced by another statement, e.g., if the call | |
2591 | simplifies to a constant value. Return true if any changes were made. | |
2592 | It is assumed that the operands have been previously folded. */ | |
2593 | ||
e021c122 | 2594 | static bool |
ceeffab0 | 2595 | gimple_fold_call (gimple_stmt_iterator *gsi, bool inplace) |
cbdd87d4 RG |
2596 | { |
2597 | gimple stmt = gsi_stmt (*gsi); | |
3b45a007 | 2598 | tree callee; |
e021c122 RG |
2599 | bool changed = false; |
2600 | unsigned i; | |
cbdd87d4 | 2601 | |
e021c122 RG |
2602 | /* Fold *& in call arguments. */ |
2603 | for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
2604 | if (REFERENCE_CLASS_P (gimple_call_arg (stmt, i))) | |
2605 | { | |
2606 | tree tmp = maybe_fold_reference (gimple_call_arg (stmt, i), false); | |
2607 | if (tmp) | |
2608 | { | |
2609 | gimple_call_set_arg (stmt, i, tmp); | |
2610 | changed = true; | |
2611 | } | |
2612 | } | |
3b45a007 RG |
2613 | |
2614 | /* Check for virtual calls that became direct calls. */ | |
2615 | callee = gimple_call_fn (stmt); | |
25583c4f | 2616 | if (callee && TREE_CODE (callee) == OBJ_TYPE_REF) |
3b45a007 | 2617 | { |
49c471e3 MJ |
2618 | if (gimple_call_addr_fndecl (OBJ_TYPE_REF_EXPR (callee)) != NULL_TREE) |
2619 | { | |
450ad0cd JH |
2620 | if (dump_file && virtual_method_call_p (callee) |
2621 | && !possible_polymorphic_call_target_p | |
6f8091fc JH |
2622 | (callee, stmt, cgraph_node::get (gimple_call_addr_fndecl |
2623 | (OBJ_TYPE_REF_EXPR (callee))))) | |
450ad0cd JH |
2624 | { |
2625 | fprintf (dump_file, | |
a70e9985 | 2626 | "Type inheritance inconsistent devirtualization of "); |
450ad0cd JH |
2627 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); |
2628 | fprintf (dump_file, " to "); | |
2629 | print_generic_expr (dump_file, callee, TDF_SLIM); | |
2630 | fprintf (dump_file, "\n"); | |
2631 | } | |
2632 | ||
49c471e3 | 2633 | gimple_call_set_fn (stmt, OBJ_TYPE_REF_EXPR (callee)); |
e021c122 RG |
2634 | changed = true; |
2635 | } | |
a70e9985 | 2636 | else if (flag_devirtualize && !inplace && virtual_method_call_p (callee)) |
e021c122 | 2637 | { |
61dd6a2e JH |
2638 | bool final; |
2639 | vec <cgraph_node *>targets | |
058d0a90 | 2640 | = possible_polymorphic_call_targets (callee, stmt, &final); |
2b5f0895 | 2641 | if (final && targets.length () <= 1 && dbg_cnt (devirt)) |
e021c122 | 2642 | { |
a70e9985 | 2643 | tree lhs = gimple_call_lhs (stmt); |
2b5f0895 XDL |
2644 | if (dump_enabled_p ()) |
2645 | { | |
807b7d62 | 2646 | location_t loc = gimple_location_safe (stmt); |
2b5f0895 XDL |
2647 | dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, loc, |
2648 | "folding virtual function call to %s\n", | |
2649 | targets.length () == 1 | |
2650 | ? targets[0]->name () | |
2651 | : "__builtin_unreachable"); | |
2652 | } | |
61dd6a2e | 2653 | if (targets.length () == 1) |
cf3e5a89 JJ |
2654 | { |
2655 | gimple_call_set_fndecl (stmt, targets[0]->decl); | |
2656 | changed = true; | |
a70e9985 JJ |
2657 | /* If the call becomes noreturn, remove the lhs. */ |
2658 | if (lhs && (gimple_call_flags (stmt) & ECF_NORETURN)) | |
2659 | { | |
2660 | if (TREE_CODE (lhs) == SSA_NAME) | |
2661 | { | |
2662 | tree var = create_tmp_var (TREE_TYPE (lhs), NULL); | |
2663 | tree def = get_or_create_ssa_default_def (cfun, var); | |
2664 | gimple new_stmt = gimple_build_assign (lhs, def); | |
2665 | gsi_insert_before (gsi, new_stmt, GSI_SAME_STMT); | |
2666 | } | |
2667 | gimple_call_set_lhs (stmt, NULL_TREE); | |
2668 | } | |
cf3e5a89 | 2669 | } |
a70e9985 | 2670 | else |
cf3e5a89 JJ |
2671 | { |
2672 | tree fndecl = builtin_decl_implicit (BUILT_IN_UNREACHABLE); | |
2673 | gimple new_stmt = gimple_build_call (fndecl, 0); | |
2674 | gimple_set_location (new_stmt, gimple_location (stmt)); | |
a70e9985 JJ |
2675 | if (lhs && TREE_CODE (lhs) == SSA_NAME) |
2676 | { | |
2677 | tree var = create_tmp_var (TREE_TYPE (lhs), NULL); | |
2678 | tree def = get_or_create_ssa_default_def (cfun, var); | |
eb14a79f ML |
2679 | |
2680 | /* To satisfy condition for | |
2681 | cgraph_update_edges_for_call_stmt_node, | |
2682 | we need to preserve GIMPLE_CALL statement | |
2683 | at position of GSI iterator. */ | |
a70e9985 | 2684 | update_call_from_tree (gsi, def); |
eb14a79f | 2685 | gsi_insert_before (gsi, new_stmt, GSI_NEW_STMT); |
a70e9985 JJ |
2686 | } |
2687 | else | |
42e52a51 RB |
2688 | { |
2689 | gimple_set_vuse (new_stmt, gimple_vuse (stmt)); | |
2690 | gimple_set_vdef (new_stmt, gimple_vdef (stmt)); | |
2691 | gsi_replace (gsi, new_stmt, false); | |
2692 | } | |
cf3e5a89 JJ |
2693 | return true; |
2694 | } | |
e021c122 | 2695 | } |
49c471e3 | 2696 | } |
e021c122 | 2697 | } |
49c471e3 | 2698 | |
e021c122 RG |
2699 | if (inplace) |
2700 | return changed; | |
2701 | ||
2702 | /* Check for builtins that CCP can handle using information not | |
2703 | available in the generic fold routines. */ | |
fef5a0d9 RB |
2704 | if (gimple_call_builtin_p (stmt, BUILT_IN_NORMAL)) |
2705 | { | |
2706 | if (gimple_fold_builtin (gsi)) | |
2707 | changed = true; | |
2708 | } | |
2709 | else if (gimple_call_builtin_p (stmt, BUILT_IN_MD)) | |
e021c122 | 2710 | { |
ea679d55 | 2711 | changed |= targetm.gimple_fold_builtin (gsi); |
3b45a007 | 2712 | } |
368b454d | 2713 | else if (gimple_call_internal_p (stmt)) |
ed9c79e1 | 2714 | { |
368b454d JJ |
2715 | enum tree_code subcode = ERROR_MARK; |
2716 | tree result = NULL_TREE; | |
2717 | switch (gimple_call_internal_fn (stmt)) | |
2718 | { | |
2719 | case IFN_BUILTIN_EXPECT: | |
2720 | result = fold_builtin_expect (gimple_location (stmt), | |
2721 | gimple_call_arg (stmt, 0), | |
2722 | gimple_call_arg (stmt, 1), | |
2723 | gimple_call_arg (stmt, 2)); | |
2724 | break; | |
0e82f089 MP |
2725 | case IFN_UBSAN_OBJECT_SIZE: |
2726 | if (integer_all_onesp (gimple_call_arg (stmt, 2)) | |
2727 | || (TREE_CODE (gimple_call_arg (stmt, 1)) == INTEGER_CST | |
2728 | && TREE_CODE (gimple_call_arg (stmt, 2)) == INTEGER_CST | |
2729 | && tree_int_cst_le (gimple_call_arg (stmt, 1), | |
2730 | gimple_call_arg (stmt, 2)))) | |
2731 | { | |
2732 | gsi_replace (gsi, gimple_build_nop (), true); | |
2733 | unlink_stmt_vdef (stmt); | |
2734 | release_defs (stmt); | |
2735 | return true; | |
2736 | } | |
2737 | break; | |
368b454d JJ |
2738 | case IFN_UBSAN_CHECK_ADD: |
2739 | subcode = PLUS_EXPR; | |
2740 | break; | |
2741 | case IFN_UBSAN_CHECK_SUB: | |
2742 | subcode = MINUS_EXPR; | |
2743 | break; | |
2744 | case IFN_UBSAN_CHECK_MUL: | |
2745 | subcode = MULT_EXPR; | |
2746 | break; | |
2747 | default: | |
2748 | break; | |
2749 | } | |
2750 | if (subcode != ERROR_MARK) | |
2751 | { | |
2752 | tree arg0 = gimple_call_arg (stmt, 0); | |
2753 | tree arg1 = gimple_call_arg (stmt, 1); | |
2754 | /* x = y + 0; x = y - 0; x = y * 0; */ | |
2755 | if (integer_zerop (arg1)) | |
2756 | result = subcode == MULT_EXPR | |
2757 | ? build_zero_cst (TREE_TYPE (arg0)) | |
2758 | : arg0; | |
2759 | /* x = 0 + y; x = 0 * y; */ | |
2760 | else if (subcode != MINUS_EXPR && integer_zerop (arg0)) | |
2761 | result = subcode == MULT_EXPR | |
2762 | ? build_zero_cst (TREE_TYPE (arg0)) | |
2763 | : arg1; | |
2764 | /* x = y - y; */ | |
2765 | else if (subcode == MINUS_EXPR && operand_equal_p (arg0, arg1, 0)) | |
2766 | result = build_zero_cst (TREE_TYPE (arg0)); | |
2767 | /* x = y * 1; x = 1 * y; */ | |
2768 | else if (subcode == MULT_EXPR) | |
2769 | { | |
2770 | if (integer_onep (arg1)) | |
2771 | result = arg0; | |
2772 | else if (integer_onep (arg0)) | |
2773 | result = arg1; | |
2774 | } | |
2775 | } | |
ed9c79e1 JJ |
2776 | if (result) |
2777 | { | |
2778 | if (!update_call_from_tree (gsi, result)) | |
2779 | gimplify_and_update_call_from_tree (gsi, result); | |
2780 | changed = true; | |
2781 | } | |
2782 | } | |
3b45a007 | 2783 | |
e021c122 | 2784 | return changed; |
cbdd87d4 RG |
2785 | } |
2786 | ||
e0ee10ed RB |
2787 | |
2788 | /* Worker for fold_stmt_1 dispatch to pattern based folding with | |
2789 | gimple_simplify. | |
2790 | ||
2791 | Replaces *GSI with the simplification result in RCODE and OPS | |
2792 | and the associated statements in *SEQ. Does the replacement | |
2793 | according to INPLACE and returns true if the operation succeeded. */ | |
2794 | ||
2795 | static bool | |
2796 | replace_stmt_with_simplification (gimple_stmt_iterator *gsi, | |
2797 | code_helper rcode, tree *ops, | |
2798 | gimple_seq *seq, bool inplace) | |
2799 | { | |
2800 | gimple stmt = gsi_stmt (*gsi); | |
2801 | ||
2802 | /* Play safe and do not allow abnormals to be mentioned in | |
2803 | newly created statements. See also maybe_push_res_to_seq. */ | |
2804 | if ((TREE_CODE (ops[0]) == SSA_NAME | |
2805 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[0])) | |
2806 | || (ops[1] | |
2807 | && TREE_CODE (ops[1]) == SSA_NAME | |
2808 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[1])) | |
2809 | || (ops[2] | |
2810 | && TREE_CODE (ops[2]) == SSA_NAME | |
2811 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[2]))) | |
2812 | return false; | |
2813 | ||
2814 | if (gimple_code (stmt) == GIMPLE_COND) | |
2815 | { | |
2816 | gcc_assert (rcode.is_tree_code ()); | |
2817 | if (TREE_CODE_CLASS ((enum tree_code)rcode) == tcc_comparison | |
2818 | /* GIMPLE_CONDs condition may not throw. */ | |
2819 | && (!flag_exceptions | |
2820 | || !cfun->can_throw_non_call_exceptions | |
2821 | || !operation_could_trap_p (rcode, | |
2822 | FLOAT_TYPE_P (TREE_TYPE (ops[0])), | |
2823 | false, NULL_TREE))) | |
2824 | gimple_cond_set_condition (stmt, rcode, ops[0], ops[1]); | |
2825 | else if (rcode == SSA_NAME) | |
2826 | gimple_cond_set_condition (stmt, NE_EXPR, ops[0], | |
2827 | build_zero_cst (TREE_TYPE (ops[0]))); | |
2828 | else if (rcode == INTEGER_CST) | |
2829 | { | |
2830 | if (integer_zerop (ops[0])) | |
2831 | gimple_cond_make_false (stmt); | |
2832 | else | |
2833 | gimple_cond_make_true (stmt); | |
2834 | } | |
2835 | else if (!inplace) | |
2836 | { | |
2837 | tree res = maybe_push_res_to_seq (rcode, boolean_type_node, | |
2838 | ops, seq); | |
2839 | if (!res) | |
2840 | return false; | |
2841 | gimple_cond_set_condition (stmt, NE_EXPR, res, | |
2842 | build_zero_cst (TREE_TYPE (res))); | |
2843 | } | |
2844 | else | |
2845 | return false; | |
2846 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2847 | { | |
2848 | fprintf (dump_file, "gimple_simplified to "); | |
2849 | if (!gimple_seq_empty_p (*seq)) | |
2850 | print_gimple_seq (dump_file, *seq, 0, TDF_SLIM); | |
2851 | print_gimple_stmt (dump_file, gsi_stmt (*gsi), | |
2852 | 0, TDF_SLIM); | |
2853 | } | |
2854 | gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT); | |
2855 | return true; | |
2856 | } | |
2857 | else if (is_gimple_assign (stmt) | |
2858 | && rcode.is_tree_code ()) | |
2859 | { | |
2860 | if (!inplace | |
f3582e54 | 2861 | || gimple_num_ops (stmt) > get_gimple_rhs_num_ops (rcode)) |
e0ee10ed RB |
2862 | { |
2863 | maybe_build_generic_op (rcode, | |
2864 | TREE_TYPE (gimple_assign_lhs (stmt)), | |
2865 | &ops[0], ops[1], ops[2]); | |
2866 | gimple_assign_set_rhs_with_ops_1 (gsi, rcode, | |
2867 | ops[0], ops[1], ops[2]); | |
2868 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2869 | { | |
2870 | fprintf (dump_file, "gimple_simplified to "); | |
2871 | if (!gimple_seq_empty_p (*seq)) | |
2872 | print_gimple_seq (dump_file, *seq, 0, TDF_SLIM); | |
2873 | print_gimple_stmt (dump_file, gsi_stmt (*gsi), | |
2874 | 0, TDF_SLIM); | |
2875 | } | |
2876 | gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT); | |
2877 | return true; | |
2878 | } | |
2879 | } | |
2880 | else if (!inplace) | |
2881 | { | |
2882 | if (gimple_has_lhs (stmt)) | |
2883 | { | |
2884 | tree lhs = gimple_get_lhs (stmt); | |
2885 | maybe_push_res_to_seq (rcode, TREE_TYPE (lhs), | |
2886 | ops, seq, lhs); | |
2887 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
2888 | { | |
2889 | fprintf (dump_file, "gimple_simplified to "); | |
2890 | print_gimple_seq (dump_file, *seq, 0, TDF_SLIM); | |
2891 | } | |
2892 | gsi_replace_with_seq_vops (gsi, *seq); | |
2893 | return true; | |
2894 | } | |
2895 | else | |
2896 | gcc_unreachable (); | |
2897 | } | |
2898 | ||
2899 | return false; | |
2900 | } | |
2901 | ||
040292e7 RB |
2902 | /* Canonicalize MEM_REFs invariant address operand after propagation. */ |
2903 | ||
2904 | static bool | |
2905 | maybe_canonicalize_mem_ref_addr (tree *t) | |
2906 | { | |
2907 | bool res = false; | |
2908 | ||
2909 | if (TREE_CODE (*t) == ADDR_EXPR) | |
2910 | t = &TREE_OPERAND (*t, 0); | |
2911 | ||
2912 | while (handled_component_p (*t)) | |
2913 | t = &TREE_OPERAND (*t, 0); | |
2914 | ||
2915 | /* Canonicalize MEM [&foo.bar, 0] which appears after propagating | |
2916 | of invariant addresses into a SSA name MEM_REF address. */ | |
2917 | if (TREE_CODE (*t) == MEM_REF | |
2918 | || TREE_CODE (*t) == TARGET_MEM_REF) | |
2919 | { | |
2920 | tree addr = TREE_OPERAND (*t, 0); | |
2921 | if (TREE_CODE (addr) == ADDR_EXPR | |
2922 | && (TREE_CODE (TREE_OPERAND (addr, 0)) == MEM_REF | |
2923 | || handled_component_p (TREE_OPERAND (addr, 0)))) | |
2924 | { | |
2925 | tree base; | |
2926 | HOST_WIDE_INT coffset; | |
2927 | base = get_addr_base_and_unit_offset (TREE_OPERAND (addr, 0), | |
2928 | &coffset); | |
2929 | if (!base) | |
2930 | gcc_unreachable (); | |
2931 | ||
2932 | TREE_OPERAND (*t, 0) = build_fold_addr_expr (base); | |
2933 | TREE_OPERAND (*t, 1) = int_const_binop (PLUS_EXPR, | |
2934 | TREE_OPERAND (*t, 1), | |
2935 | size_int (coffset)); | |
2936 | res = true; | |
2937 | } | |
2938 | gcc_checking_assert (TREE_CODE (TREE_OPERAND (*t, 0)) == DEBUG_EXPR_DECL | |
2939 | || is_gimple_mem_ref_addr (TREE_OPERAND (*t, 0))); | |
2940 | } | |
2941 | ||
2942 | /* Canonicalize back MEM_REFs to plain reference trees if the object | |
2943 | accessed is a decl that has the same access semantics as the MEM_REF. */ | |
2944 | if (TREE_CODE (*t) == MEM_REF | |
2945 | && TREE_CODE (TREE_OPERAND (*t, 0)) == ADDR_EXPR | |
2946 | && integer_zerop (TREE_OPERAND (*t, 1))) | |
2947 | { | |
2948 | tree decl = TREE_OPERAND (TREE_OPERAND (*t, 0), 0); | |
2949 | tree alias_type = TREE_TYPE (TREE_OPERAND (*t, 1)); | |
2950 | if (/* Same volatile qualification. */ | |
2951 | TREE_THIS_VOLATILE (*t) == TREE_THIS_VOLATILE (decl) | |
2952 | /* Same TBAA behavior with -fstrict-aliasing. */ | |
2953 | && !TYPE_REF_CAN_ALIAS_ALL (alias_type) | |
2954 | && (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) | |
2955 | == TYPE_MAIN_VARIANT (TREE_TYPE (alias_type))) | |
2956 | /* Same alignment. */ | |
2957 | && TYPE_ALIGN (TREE_TYPE (decl)) == TYPE_ALIGN (TREE_TYPE (*t)) | |
2958 | /* We have to look out here to not drop a required conversion | |
2959 | from the rhs to the lhs if *t appears on the lhs or vice-versa | |
2960 | if it appears on the rhs. Thus require strict type | |
2961 | compatibility. */ | |
2962 | && types_compatible_p (TREE_TYPE (*t), TREE_TYPE (decl))) | |
2963 | { | |
2964 | *t = TREE_OPERAND (TREE_OPERAND (*t, 0), 0); | |
2965 | res = true; | |
2966 | } | |
2967 | } | |
2968 | ||
2969 | /* Canonicalize TARGET_MEM_REF in particular with respect to | |
2970 | the indexes becoming constant. */ | |
2971 | else if (TREE_CODE (*t) == TARGET_MEM_REF) | |
2972 | { | |
2973 | tree tem = maybe_fold_tmr (*t); | |
2974 | if (tem) | |
2975 | { | |
2976 | *t = tem; | |
2977 | res = true; | |
2978 | } | |
2979 | } | |
2980 | ||
2981 | return res; | |
2982 | } | |
2983 | ||
cbdd87d4 RG |
2984 | /* Worker for both fold_stmt and fold_stmt_inplace. The INPLACE argument |
2985 | distinguishes both cases. */ | |
2986 | ||
2987 | static bool | |
e0ee10ed | 2988 | fold_stmt_1 (gimple_stmt_iterator *gsi, bool inplace, tree (*valueize) (tree)) |
cbdd87d4 RG |
2989 | { |
2990 | bool changed = false; | |
2991 | gimple stmt = gsi_stmt (*gsi); | |
2992 | unsigned i; | |
2993 | ||
040292e7 RB |
2994 | /* First do required canonicalization of [TARGET_]MEM_REF addresses |
2995 | after propagation. | |
2996 | ??? This shouldn't be done in generic folding but in the | |
2997 | propagation helpers which also know whether an address was | |
2998 | propagated. */ | |
2999 | switch (gimple_code (stmt)) | |
3000 | { | |
3001 | case GIMPLE_ASSIGN: | |
3002 | if (gimple_assign_rhs_class (stmt) == GIMPLE_SINGLE_RHS) | |
3003 | { | |
3004 | tree *rhs = gimple_assign_rhs1_ptr (stmt); | |
3005 | if ((REFERENCE_CLASS_P (*rhs) | |
3006 | || TREE_CODE (*rhs) == ADDR_EXPR) | |
3007 | && maybe_canonicalize_mem_ref_addr (rhs)) | |
3008 | changed = true; | |
3009 | tree *lhs = gimple_assign_lhs_ptr (stmt); | |
3010 | if (REFERENCE_CLASS_P (*lhs) | |
3011 | && maybe_canonicalize_mem_ref_addr (lhs)) | |
3012 | changed = true; | |
3013 | } | |
3014 | break; | |
3015 | case GIMPLE_CALL: | |
3016 | { | |
3017 | for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
3018 | { | |
3019 | tree *arg = gimple_call_arg_ptr (stmt, i); | |
3020 | if (REFERENCE_CLASS_P (*arg) | |
3021 | && maybe_canonicalize_mem_ref_addr (arg)) | |
3022 | changed = true; | |
3023 | } | |
3024 | tree *lhs = gimple_call_lhs_ptr (stmt); | |
3025 | if (*lhs | |
3026 | && REFERENCE_CLASS_P (*lhs) | |
3027 | && maybe_canonicalize_mem_ref_addr (lhs)) | |
3028 | changed = true; | |
3029 | break; | |
3030 | } | |
3031 | case GIMPLE_ASM: | |
3032 | { | |
3033 | for (i = 0; i < gimple_asm_noutputs (stmt); ++i) | |
3034 | { | |
3035 | tree link = gimple_asm_output_op (stmt, i); | |
3036 | tree op = TREE_VALUE (link); | |
3037 | if (REFERENCE_CLASS_P (op) | |
3038 | && maybe_canonicalize_mem_ref_addr (&TREE_VALUE (link))) | |
3039 | changed = true; | |
3040 | } | |
3041 | for (i = 0; i < gimple_asm_ninputs (stmt); ++i) | |
3042 | { | |
3043 | tree link = gimple_asm_input_op (stmt, i); | |
3044 | tree op = TREE_VALUE (link); | |
3045 | if ((REFERENCE_CLASS_P (op) | |
3046 | || TREE_CODE (op) == ADDR_EXPR) | |
3047 | && maybe_canonicalize_mem_ref_addr (&TREE_VALUE (link))) | |
3048 | changed = true; | |
3049 | } | |
3050 | } | |
3051 | break; | |
3052 | case GIMPLE_DEBUG: | |
3053 | if (gimple_debug_bind_p (stmt)) | |
3054 | { | |
3055 | tree *val = gimple_debug_bind_get_value_ptr (stmt); | |
3056 | if (*val | |
3057 | && (REFERENCE_CLASS_P (*val) | |
3058 | || TREE_CODE (*val) == ADDR_EXPR) | |
3059 | && maybe_canonicalize_mem_ref_addr (val)) | |
3060 | changed = true; | |
3061 | } | |
3062 | break; | |
3063 | default:; | |
3064 | } | |
3065 | ||
e0ee10ed RB |
3066 | /* Dispatch to pattern-based folding. */ |
3067 | if (!inplace | |
3068 | || is_gimple_assign (stmt) | |
3069 | || gimple_code (stmt) == GIMPLE_COND) | |
3070 | { | |
3071 | gimple_seq seq = NULL; | |
3072 | code_helper rcode; | |
3073 | tree ops[3] = {}; | |
3074 | if (gimple_simplify (stmt, &rcode, ops, inplace ? NULL : &seq, valueize)) | |
3075 | { | |
3076 | if (replace_stmt_with_simplification (gsi, rcode, ops, &seq, inplace)) | |
3077 | changed = true; | |
3078 | else | |
3079 | gimple_seq_discard (seq); | |
3080 | } | |
3081 | } | |
3082 | ||
3083 | stmt = gsi_stmt (*gsi); | |
3084 | ||
cbdd87d4 RG |
3085 | /* Fold the main computation performed by the statement. */ |
3086 | switch (gimple_code (stmt)) | |
3087 | { | |
3088 | case GIMPLE_ASSIGN: | |
3089 | { | |
3090 | unsigned old_num_ops = gimple_num_ops (stmt); | |
5fbcc0ed | 3091 | enum tree_code subcode = gimple_assign_rhs_code (stmt); |
cbdd87d4 | 3092 | tree lhs = gimple_assign_lhs (stmt); |
5fbcc0ed RG |
3093 | tree new_rhs; |
3094 | /* First canonicalize operand order. This avoids building new | |
3095 | trees if this is the only thing fold would later do. */ | |
3096 | if ((commutative_tree_code (subcode) | |
3097 | || commutative_ternary_tree_code (subcode)) | |
3098 | && tree_swap_operands_p (gimple_assign_rhs1 (stmt), | |
3099 | gimple_assign_rhs2 (stmt), false)) | |
3100 | { | |
3101 | tree tem = gimple_assign_rhs1 (stmt); | |
3102 | gimple_assign_set_rhs1 (stmt, gimple_assign_rhs2 (stmt)); | |
3103 | gimple_assign_set_rhs2 (stmt, tem); | |
3104 | changed = true; | |
3105 | } | |
3106 | new_rhs = fold_gimple_assign (gsi); | |
cbdd87d4 RG |
3107 | if (new_rhs |
3108 | && !useless_type_conversion_p (TREE_TYPE (lhs), | |
3109 | TREE_TYPE (new_rhs))) | |
3110 | new_rhs = fold_convert (TREE_TYPE (lhs), new_rhs); | |
3111 | if (new_rhs | |
3112 | && (!inplace | |
3113 | || get_gimple_rhs_num_ops (TREE_CODE (new_rhs)) < old_num_ops)) | |
3114 | { | |
3115 | gimple_assign_set_rhs_from_tree (gsi, new_rhs); | |
3116 | changed = true; | |
3117 | } | |
3118 | break; | |
3119 | } | |
3120 | ||
3121 | case GIMPLE_COND: | |
3122 | changed |= fold_gimple_cond (stmt); | |
3123 | break; | |
3124 | ||
3125 | case GIMPLE_CALL: | |
ceeffab0 | 3126 | changed |= gimple_fold_call (gsi, inplace); |
cbdd87d4 RG |
3127 | break; |
3128 | ||
3129 | case GIMPLE_ASM: | |
3130 | /* Fold *& in asm operands. */ | |
38384150 JJ |
3131 | { |
3132 | size_t noutputs; | |
3133 | const char **oconstraints; | |
3134 | const char *constraint; | |
3135 | bool allows_mem, allows_reg; | |
3136 | ||
3137 | noutputs = gimple_asm_noutputs (stmt); | |
3138 | oconstraints = XALLOCAVEC (const char *, noutputs); | |
3139 | ||
3140 | for (i = 0; i < gimple_asm_noutputs (stmt); ++i) | |
3141 | { | |
3142 | tree link = gimple_asm_output_op (stmt, i); | |
3143 | tree op = TREE_VALUE (link); | |
3144 | oconstraints[i] | |
3145 | = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
3146 | if (REFERENCE_CLASS_P (op) | |
3147 | && (op = maybe_fold_reference (op, true)) != NULL_TREE) | |
3148 | { | |
3149 | TREE_VALUE (link) = op; | |
3150 | changed = true; | |
3151 | } | |
3152 | } | |
3153 | for (i = 0; i < gimple_asm_ninputs (stmt); ++i) | |
3154 | { | |
3155 | tree link = gimple_asm_input_op (stmt, i); | |
3156 | tree op = TREE_VALUE (link); | |
3157 | constraint | |
3158 | = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link))); | |
3159 | parse_input_constraint (&constraint, 0, 0, noutputs, 0, | |
3160 | oconstraints, &allows_mem, &allows_reg); | |
3161 | if (REFERENCE_CLASS_P (op) | |
3162 | && (op = maybe_fold_reference (op, !allows_reg && allows_mem)) | |
3163 | != NULL_TREE) | |
3164 | { | |
3165 | TREE_VALUE (link) = op; | |
3166 | changed = true; | |
3167 | } | |
3168 | } | |
3169 | } | |
cbdd87d4 RG |
3170 | break; |
3171 | ||
bd422c4a RG |
3172 | case GIMPLE_DEBUG: |
3173 | if (gimple_debug_bind_p (stmt)) | |
3174 | { | |
3175 | tree val = gimple_debug_bind_get_value (stmt); | |
3176 | if (val | |
3177 | && REFERENCE_CLASS_P (val)) | |
3178 | { | |
3179 | tree tem = maybe_fold_reference (val, false); | |
3180 | if (tem) | |
3181 | { | |
3182 | gimple_debug_bind_set_value (stmt, tem); | |
3183 | changed = true; | |
3184 | } | |
3185 | } | |
3e888a5e RG |
3186 | else if (val |
3187 | && TREE_CODE (val) == ADDR_EXPR) | |
3188 | { | |
3189 | tree ref = TREE_OPERAND (val, 0); | |
3190 | tree tem = maybe_fold_reference (ref, false); | |
3191 | if (tem) | |
3192 | { | |
3193 | tem = build_fold_addr_expr_with_type (tem, TREE_TYPE (val)); | |
3194 | gimple_debug_bind_set_value (stmt, tem); | |
3195 | changed = true; | |
3196 | } | |
3197 | } | |
bd422c4a RG |
3198 | } |
3199 | break; | |
3200 | ||
cbdd87d4 RG |
3201 | default:; |
3202 | } | |
3203 | ||
3204 | stmt = gsi_stmt (*gsi); | |
3205 | ||
37376165 RB |
3206 | /* Fold *& on the lhs. */ |
3207 | if (gimple_has_lhs (stmt)) | |
cbdd87d4 RG |
3208 | { |
3209 | tree lhs = gimple_get_lhs (stmt); | |
3210 | if (lhs && REFERENCE_CLASS_P (lhs)) | |
3211 | { | |
3212 | tree new_lhs = maybe_fold_reference (lhs, true); | |
3213 | if (new_lhs) | |
3214 | { | |
3215 | gimple_set_lhs (stmt, new_lhs); | |
3216 | changed = true; | |
3217 | } | |
3218 | } | |
3219 | } | |
3220 | ||
3221 | return changed; | |
3222 | } | |
3223 | ||
e0ee10ed RB |
3224 | /* Valueziation callback that ends up not following SSA edges. */ |
3225 | ||
3226 | tree | |
3227 | no_follow_ssa_edges (tree) | |
3228 | { | |
3229 | return NULL_TREE; | |
3230 | } | |
3231 | ||
45cc9f96 RB |
3232 | /* Valueization callback that ends up following single-use SSA edges only. */ |
3233 | ||
3234 | tree | |
3235 | follow_single_use_edges (tree val) | |
3236 | { | |
3237 | if (TREE_CODE (val) == SSA_NAME | |
3238 | && !has_single_use (val)) | |
3239 | return NULL_TREE; | |
3240 | return val; | |
3241 | } | |
3242 | ||
cbdd87d4 RG |
3243 | /* Fold the statement pointed to by GSI. In some cases, this function may |
3244 | replace the whole statement with a new one. Returns true iff folding | |
3245 | makes any changes. | |
3246 | The statement pointed to by GSI should be in valid gimple form but may | |
3247 | be in unfolded state as resulting from for example constant propagation | |
3248 | which can produce *&x = 0. */ | |
3249 | ||
3250 | bool | |
3251 | fold_stmt (gimple_stmt_iterator *gsi) | |
3252 | { | |
e0ee10ed RB |
3253 | return fold_stmt_1 (gsi, false, no_follow_ssa_edges); |
3254 | } | |
3255 | ||
3256 | bool | |
3257 | fold_stmt (gimple_stmt_iterator *gsi, tree (*valueize) (tree)) | |
3258 | { | |
3259 | return fold_stmt_1 (gsi, false, valueize); | |
cbdd87d4 RG |
3260 | } |
3261 | ||
59401b92 | 3262 | /* Perform the minimal folding on statement *GSI. Only operations like |
cbdd87d4 RG |
3263 | *&x created by constant propagation are handled. The statement cannot |
3264 | be replaced with a new one. Return true if the statement was | |
3265 | changed, false otherwise. | |
59401b92 | 3266 | The statement *GSI should be in valid gimple form but may |
cbdd87d4 RG |
3267 | be in unfolded state as resulting from for example constant propagation |
3268 | which can produce *&x = 0. */ | |
3269 | ||
3270 | bool | |
59401b92 | 3271 | fold_stmt_inplace (gimple_stmt_iterator *gsi) |
cbdd87d4 | 3272 | { |
59401b92 | 3273 | gimple stmt = gsi_stmt (*gsi); |
e0ee10ed | 3274 | bool changed = fold_stmt_1 (gsi, true, no_follow_ssa_edges); |
59401b92 | 3275 | gcc_assert (gsi_stmt (*gsi) == stmt); |
cbdd87d4 RG |
3276 | return changed; |
3277 | } | |
3278 | ||
e89065a1 SL |
3279 | /* Canonicalize and possibly invert the boolean EXPR; return NULL_TREE |
3280 | if EXPR is null or we don't know how. | |
3281 | If non-null, the result always has boolean type. */ | |
3282 | ||
3283 | static tree | |
3284 | canonicalize_bool (tree expr, bool invert) | |
3285 | { | |
3286 | if (!expr) | |
3287 | return NULL_TREE; | |
3288 | else if (invert) | |
3289 | { | |
3290 | if (integer_nonzerop (expr)) | |
3291 | return boolean_false_node; | |
3292 | else if (integer_zerop (expr)) | |
3293 | return boolean_true_node; | |
3294 | else if (TREE_CODE (expr) == SSA_NAME) | |
3295 | return fold_build2 (EQ_EXPR, boolean_type_node, expr, | |
3296 | build_int_cst (TREE_TYPE (expr), 0)); | |
3297 | else if (TREE_CODE_CLASS (TREE_CODE (expr)) == tcc_comparison) | |
3298 | return fold_build2 (invert_tree_comparison (TREE_CODE (expr), false), | |
3299 | boolean_type_node, | |
3300 | TREE_OPERAND (expr, 0), | |
3301 | TREE_OPERAND (expr, 1)); | |
3302 | else | |
3303 | return NULL_TREE; | |
3304 | } | |
3305 | else | |
3306 | { | |
3307 | if (TREE_CODE (TREE_TYPE (expr)) == BOOLEAN_TYPE) | |
3308 | return expr; | |
3309 | if (integer_nonzerop (expr)) | |
3310 | return boolean_true_node; | |
3311 | else if (integer_zerop (expr)) | |
3312 | return boolean_false_node; | |
3313 | else if (TREE_CODE (expr) == SSA_NAME) | |
3314 | return fold_build2 (NE_EXPR, boolean_type_node, expr, | |
3315 | build_int_cst (TREE_TYPE (expr), 0)); | |
3316 | else if (TREE_CODE_CLASS (TREE_CODE (expr)) == tcc_comparison) | |
3317 | return fold_build2 (TREE_CODE (expr), | |
3318 | boolean_type_node, | |
3319 | TREE_OPERAND (expr, 0), | |
3320 | TREE_OPERAND (expr, 1)); | |
3321 | else | |
3322 | return NULL_TREE; | |
3323 | } | |
3324 | } | |
3325 | ||
3326 | /* Check to see if a boolean expression EXPR is logically equivalent to the | |
3327 | comparison (OP1 CODE OP2). Check for various identities involving | |
3328 | SSA_NAMEs. */ | |
3329 | ||
3330 | static bool | |
3331 | same_bool_comparison_p (const_tree expr, enum tree_code code, | |
3332 | const_tree op1, const_tree op2) | |
3333 | { | |
3334 | gimple s; | |
3335 | ||
3336 | /* The obvious case. */ | |
3337 | if (TREE_CODE (expr) == code | |
3338 | && operand_equal_p (TREE_OPERAND (expr, 0), op1, 0) | |
3339 | && operand_equal_p (TREE_OPERAND (expr, 1), op2, 0)) | |
3340 | return true; | |
3341 | ||
3342 | /* Check for comparing (name, name != 0) and the case where expr | |
3343 | is an SSA_NAME with a definition matching the comparison. */ | |
3344 | if (TREE_CODE (expr) == SSA_NAME | |
3345 | && TREE_CODE (TREE_TYPE (expr)) == BOOLEAN_TYPE) | |
3346 | { | |
3347 | if (operand_equal_p (expr, op1, 0)) | |
3348 | return ((code == NE_EXPR && integer_zerop (op2)) | |
3349 | || (code == EQ_EXPR && integer_nonzerop (op2))); | |
3350 | s = SSA_NAME_DEF_STMT (expr); | |
3351 | if (is_gimple_assign (s) | |
3352 | && gimple_assign_rhs_code (s) == code | |
3353 | && operand_equal_p (gimple_assign_rhs1 (s), op1, 0) | |
3354 | && operand_equal_p (gimple_assign_rhs2 (s), op2, 0)) | |
3355 | return true; | |
3356 | } | |
3357 | ||
3358 | /* If op1 is of the form (name != 0) or (name == 0), and the definition | |
3359 | of name is a comparison, recurse. */ | |
3360 | if (TREE_CODE (op1) == SSA_NAME | |
3361 | && TREE_CODE (TREE_TYPE (op1)) == BOOLEAN_TYPE) | |
3362 | { | |
3363 | s = SSA_NAME_DEF_STMT (op1); | |
3364 | if (is_gimple_assign (s) | |
3365 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison) | |
3366 | { | |
3367 | enum tree_code c = gimple_assign_rhs_code (s); | |
3368 | if ((c == NE_EXPR && integer_zerop (op2)) | |
3369 | || (c == EQ_EXPR && integer_nonzerop (op2))) | |
3370 | return same_bool_comparison_p (expr, c, | |
3371 | gimple_assign_rhs1 (s), | |
3372 | gimple_assign_rhs2 (s)); | |
3373 | if ((c == EQ_EXPR && integer_zerop (op2)) | |
3374 | || (c == NE_EXPR && integer_nonzerop (op2))) | |
3375 | return same_bool_comparison_p (expr, | |
3376 | invert_tree_comparison (c, false), | |
3377 | gimple_assign_rhs1 (s), | |
3378 | gimple_assign_rhs2 (s)); | |
3379 | } | |
3380 | } | |
3381 | return false; | |
3382 | } | |
3383 | ||
3384 | /* Check to see if two boolean expressions OP1 and OP2 are logically | |
3385 | equivalent. */ | |
3386 | ||
3387 | static bool | |
3388 | same_bool_result_p (const_tree op1, const_tree op2) | |
3389 | { | |
3390 | /* Simple cases first. */ | |
3391 | if (operand_equal_p (op1, op2, 0)) | |
3392 | return true; | |
3393 | ||
3394 | /* Check the cases where at least one of the operands is a comparison. | |
3395 | These are a bit smarter than operand_equal_p in that they apply some | |
3396 | identifies on SSA_NAMEs. */ | |
3397 | if (TREE_CODE_CLASS (TREE_CODE (op2)) == tcc_comparison | |
3398 | && same_bool_comparison_p (op1, TREE_CODE (op2), | |
3399 | TREE_OPERAND (op2, 0), | |
3400 | TREE_OPERAND (op2, 1))) | |
3401 | return true; | |
3402 | if (TREE_CODE_CLASS (TREE_CODE (op1)) == tcc_comparison | |
3403 | && same_bool_comparison_p (op2, TREE_CODE (op1), | |
3404 | TREE_OPERAND (op1, 0), | |
3405 | TREE_OPERAND (op1, 1))) | |
3406 | return true; | |
3407 | ||
3408 | /* Default case. */ | |
3409 | return false; | |
3410 | } | |
3411 | ||
3412 | /* Forward declarations for some mutually recursive functions. */ | |
3413 | ||
3414 | static tree | |
3415 | and_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
3416 | enum tree_code code2, tree op2a, tree op2b); | |
3417 | static tree | |
3418 | and_var_with_comparison (tree var, bool invert, | |
3419 | enum tree_code code2, tree op2a, tree op2b); | |
3420 | static tree | |
3421 | and_var_with_comparison_1 (gimple stmt, | |
3422 | enum tree_code code2, tree op2a, tree op2b); | |
3423 | static tree | |
3424 | or_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
3425 | enum tree_code code2, tree op2a, tree op2b); | |
3426 | static tree | |
3427 | or_var_with_comparison (tree var, bool invert, | |
3428 | enum tree_code code2, tree op2a, tree op2b); | |
3429 | static tree | |
3430 | or_var_with_comparison_1 (gimple stmt, | |
3431 | enum tree_code code2, tree op2a, tree op2b); | |
3432 | ||
3433 | /* Helper function for and_comparisons_1: try to simplify the AND of the | |
3434 | ssa variable VAR with the comparison specified by (OP2A CODE2 OP2B). | |
3435 | If INVERT is true, invert the value of the VAR before doing the AND. | |
3436 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
3437 | ||
3438 | static tree | |
3439 | and_var_with_comparison (tree var, bool invert, | |
3440 | enum tree_code code2, tree op2a, tree op2b) | |
3441 | { | |
3442 | tree t; | |
3443 | gimple stmt = SSA_NAME_DEF_STMT (var); | |
3444 | ||
3445 | /* We can only deal with variables whose definitions are assignments. */ | |
3446 | if (!is_gimple_assign (stmt)) | |
3447 | return NULL_TREE; | |
3448 | ||
3449 | /* If we have an inverted comparison, apply DeMorgan's law and rewrite | |
3450 | !var AND (op2a code2 op2b) => !(var OR !(op2a code2 op2b)) | |
3451 | Then we only have to consider the simpler non-inverted cases. */ | |
3452 | if (invert) | |
3453 | t = or_var_with_comparison_1 (stmt, | |
3454 | invert_tree_comparison (code2, false), | |
3455 | op2a, op2b); | |
3456 | else | |
3457 | t = and_var_with_comparison_1 (stmt, code2, op2a, op2b); | |
3458 | return canonicalize_bool (t, invert); | |
3459 | } | |
3460 | ||
3461 | /* Try to simplify the AND of the ssa variable defined by the assignment | |
3462 | STMT with the comparison specified by (OP2A CODE2 OP2B). | |
3463 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
3464 | ||
3465 | static tree | |
3466 | and_var_with_comparison_1 (gimple stmt, | |
3467 | enum tree_code code2, tree op2a, tree op2b) | |
3468 | { | |
3469 | tree var = gimple_assign_lhs (stmt); | |
3470 | tree true_test_var = NULL_TREE; | |
3471 | tree false_test_var = NULL_TREE; | |
3472 | enum tree_code innercode = gimple_assign_rhs_code (stmt); | |
3473 | ||
3474 | /* Check for identities like (var AND (var == 0)) => false. */ | |
3475 | if (TREE_CODE (op2a) == SSA_NAME | |
3476 | && TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE) | |
3477 | { | |
3478 | if ((code2 == NE_EXPR && integer_zerop (op2b)) | |
3479 | || (code2 == EQ_EXPR && integer_nonzerop (op2b))) | |
3480 | { | |
3481 | true_test_var = op2a; | |
3482 | if (var == true_test_var) | |
3483 | return var; | |
3484 | } | |
3485 | else if ((code2 == EQ_EXPR && integer_zerop (op2b)) | |
3486 | || (code2 == NE_EXPR && integer_nonzerop (op2b))) | |
3487 | { | |
3488 | false_test_var = op2a; | |
3489 | if (var == false_test_var) | |
3490 | return boolean_false_node; | |
3491 | } | |
3492 | } | |
3493 | ||
3494 | /* If the definition is a comparison, recurse on it. */ | |
3495 | if (TREE_CODE_CLASS (innercode) == tcc_comparison) | |
3496 | { | |
3497 | tree t = and_comparisons_1 (innercode, | |
3498 | gimple_assign_rhs1 (stmt), | |
3499 | gimple_assign_rhs2 (stmt), | |
3500 | code2, | |
3501 | op2a, | |
3502 | op2b); | |
3503 | if (t) | |
3504 | return t; | |
3505 | } | |
3506 | ||
3507 | /* If the definition is an AND or OR expression, we may be able to | |
3508 | simplify by reassociating. */ | |
eb9820c0 KT |
3509 | if (TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE |
3510 | && (innercode == BIT_AND_EXPR || innercode == BIT_IOR_EXPR)) | |
e89065a1 SL |
3511 | { |
3512 | tree inner1 = gimple_assign_rhs1 (stmt); | |
3513 | tree inner2 = gimple_assign_rhs2 (stmt); | |
3514 | gimple s; | |
3515 | tree t; | |
3516 | tree partial = NULL_TREE; | |
eb9820c0 | 3517 | bool is_and = (innercode == BIT_AND_EXPR); |
e89065a1 SL |
3518 | |
3519 | /* Check for boolean identities that don't require recursive examination | |
3520 | of inner1/inner2: | |
3521 | inner1 AND (inner1 AND inner2) => inner1 AND inner2 => var | |
3522 | inner1 AND (inner1 OR inner2) => inner1 | |
3523 | !inner1 AND (inner1 AND inner2) => false | |
3524 | !inner1 AND (inner1 OR inner2) => !inner1 AND inner2 | |
3525 | Likewise for similar cases involving inner2. */ | |
3526 | if (inner1 == true_test_var) | |
3527 | return (is_and ? var : inner1); | |
3528 | else if (inner2 == true_test_var) | |
3529 | return (is_and ? var : inner2); | |
3530 | else if (inner1 == false_test_var) | |
3531 | return (is_and | |
3532 | ? boolean_false_node | |
3533 | : and_var_with_comparison (inner2, false, code2, op2a, op2b)); | |
3534 | else if (inner2 == false_test_var) | |
3535 | return (is_and | |
3536 | ? boolean_false_node | |
3537 | : and_var_with_comparison (inner1, false, code2, op2a, op2b)); | |
3538 | ||
3539 | /* Next, redistribute/reassociate the AND across the inner tests. | |
3540 | Compute the first partial result, (inner1 AND (op2a code op2b)) */ | |
3541 | if (TREE_CODE (inner1) == SSA_NAME | |
3542 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner1)) | |
3543 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
3544 | && (t = maybe_fold_and_comparisons (gimple_assign_rhs_code (s), | |
3545 | gimple_assign_rhs1 (s), | |
3546 | gimple_assign_rhs2 (s), | |
3547 | code2, op2a, op2b))) | |
3548 | { | |
3549 | /* Handle the AND case, where we are reassociating: | |
3550 | (inner1 AND inner2) AND (op2a code2 op2b) | |
3551 | => (t AND inner2) | |
3552 | If the partial result t is a constant, we win. Otherwise | |
3553 | continue on to try reassociating with the other inner test. */ | |
3554 | if (is_and) | |
3555 | { | |
3556 | if (integer_onep (t)) | |
3557 | return inner2; | |
3558 | else if (integer_zerop (t)) | |
3559 | return boolean_false_node; | |
3560 | } | |
3561 | ||
3562 | /* Handle the OR case, where we are redistributing: | |
3563 | (inner1 OR inner2) AND (op2a code2 op2b) | |
3564 | => (t OR (inner2 AND (op2a code2 op2b))) */ | |
8236c8eb JJ |
3565 | else if (integer_onep (t)) |
3566 | return boolean_true_node; | |
3567 | ||
3568 | /* Save partial result for later. */ | |
3569 | partial = t; | |
e89065a1 SL |
3570 | } |
3571 | ||
3572 | /* Compute the second partial result, (inner2 AND (op2a code op2b)) */ | |
3573 | if (TREE_CODE (inner2) == SSA_NAME | |
3574 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner2)) | |
3575 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
3576 | && (t = maybe_fold_and_comparisons (gimple_assign_rhs_code (s), | |
3577 | gimple_assign_rhs1 (s), | |
3578 | gimple_assign_rhs2 (s), | |
3579 | code2, op2a, op2b))) | |
3580 | { | |
3581 | /* Handle the AND case, where we are reassociating: | |
3582 | (inner1 AND inner2) AND (op2a code2 op2b) | |
3583 | => (inner1 AND t) */ | |
3584 | if (is_and) | |
3585 | { | |
3586 | if (integer_onep (t)) | |
3587 | return inner1; | |
3588 | else if (integer_zerop (t)) | |
3589 | return boolean_false_node; | |
8236c8eb JJ |
3590 | /* If both are the same, we can apply the identity |
3591 | (x AND x) == x. */ | |
3592 | else if (partial && same_bool_result_p (t, partial)) | |
3593 | return t; | |
e89065a1 SL |
3594 | } |
3595 | ||
3596 | /* Handle the OR case. where we are redistributing: | |
3597 | (inner1 OR inner2) AND (op2a code2 op2b) | |
3598 | => (t OR (inner1 AND (op2a code2 op2b))) | |
3599 | => (t OR partial) */ | |
3600 | else | |
3601 | { | |
3602 | if (integer_onep (t)) | |
3603 | return boolean_true_node; | |
3604 | else if (partial) | |
3605 | { | |
3606 | /* We already got a simplification for the other | |
3607 | operand to the redistributed OR expression. The | |
3608 | interesting case is when at least one is false. | |
3609 | Or, if both are the same, we can apply the identity | |
3610 | (x OR x) == x. */ | |
3611 | if (integer_zerop (partial)) | |
3612 | return t; | |
3613 | else if (integer_zerop (t)) | |
3614 | return partial; | |
3615 | else if (same_bool_result_p (t, partial)) | |
3616 | return t; | |
3617 | } | |
3618 | } | |
3619 | } | |
3620 | } | |
3621 | return NULL_TREE; | |
3622 | } | |
3623 | ||
3624 | /* Try to simplify the AND of two comparisons defined by | |
3625 | (OP1A CODE1 OP1B) and (OP2A CODE2 OP2B), respectively. | |
3626 | If this can be done without constructing an intermediate value, | |
3627 | return the resulting tree; otherwise NULL_TREE is returned. | |
3628 | This function is deliberately asymmetric as it recurses on SSA_DEFs | |
3629 | in the first comparison but not the second. */ | |
3630 | ||
3631 | static tree | |
3632 | and_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
3633 | enum tree_code code2, tree op2a, tree op2b) | |
3634 | { | |
ae22ac3c | 3635 | tree truth_type = truth_type_for (TREE_TYPE (op1a)); |
31ed6226 | 3636 | |
e89065a1 SL |
3637 | /* First check for ((x CODE1 y) AND (x CODE2 y)). */ |
3638 | if (operand_equal_p (op1a, op2a, 0) | |
3639 | && operand_equal_p (op1b, op2b, 0)) | |
3640 | { | |
eb9820c0 | 3641 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
3642 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
3643 | TRUTH_ANDIF_EXPR, code1, code2, | |
31ed6226 | 3644 | truth_type, op1a, op1b); |
e89065a1 SL |
3645 | if (t) |
3646 | return t; | |
3647 | } | |
3648 | ||
3649 | /* Likewise the swapped case of the above. */ | |
3650 | if (operand_equal_p (op1a, op2b, 0) | |
3651 | && operand_equal_p (op1b, op2a, 0)) | |
3652 | { | |
eb9820c0 | 3653 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
3654 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
3655 | TRUTH_ANDIF_EXPR, code1, | |
3656 | swap_tree_comparison (code2), | |
31ed6226 | 3657 | truth_type, op1a, op1b); |
e89065a1 SL |
3658 | if (t) |
3659 | return t; | |
3660 | } | |
3661 | ||
3662 | /* If both comparisons are of the same value against constants, we might | |
3663 | be able to merge them. */ | |
3664 | if (operand_equal_p (op1a, op2a, 0) | |
3665 | && TREE_CODE (op1b) == INTEGER_CST | |
3666 | && TREE_CODE (op2b) == INTEGER_CST) | |
3667 | { | |
3668 | int cmp = tree_int_cst_compare (op1b, op2b); | |
3669 | ||
3670 | /* If we have (op1a == op1b), we should either be able to | |
3671 | return that or FALSE, depending on whether the constant op1b | |
3672 | also satisfies the other comparison against op2b. */ | |
3673 | if (code1 == EQ_EXPR) | |
3674 | { | |
3675 | bool done = true; | |
3676 | bool val; | |
3677 | switch (code2) | |
3678 | { | |
3679 | case EQ_EXPR: val = (cmp == 0); break; | |
3680 | case NE_EXPR: val = (cmp != 0); break; | |
3681 | case LT_EXPR: val = (cmp < 0); break; | |
3682 | case GT_EXPR: val = (cmp > 0); break; | |
3683 | case LE_EXPR: val = (cmp <= 0); break; | |
3684 | case GE_EXPR: val = (cmp >= 0); break; | |
3685 | default: done = false; | |
3686 | } | |
3687 | if (done) | |
3688 | { | |
3689 | if (val) | |
3690 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
3691 | else | |
3692 | return boolean_false_node; | |
3693 | } | |
3694 | } | |
3695 | /* Likewise if the second comparison is an == comparison. */ | |
3696 | else if (code2 == EQ_EXPR) | |
3697 | { | |
3698 | bool done = true; | |
3699 | bool val; | |
3700 | switch (code1) | |
3701 | { | |
3702 | case EQ_EXPR: val = (cmp == 0); break; | |
3703 | case NE_EXPR: val = (cmp != 0); break; | |
3704 | case LT_EXPR: val = (cmp > 0); break; | |
3705 | case GT_EXPR: val = (cmp < 0); break; | |
3706 | case LE_EXPR: val = (cmp >= 0); break; | |
3707 | case GE_EXPR: val = (cmp <= 0); break; | |
3708 | default: done = false; | |
3709 | } | |
3710 | if (done) | |
3711 | { | |
3712 | if (val) | |
3713 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
3714 | else | |
3715 | return boolean_false_node; | |
3716 | } | |
3717 | } | |
3718 | ||
3719 | /* Same business with inequality tests. */ | |
3720 | else if (code1 == NE_EXPR) | |
3721 | { | |
3722 | bool val; | |
3723 | switch (code2) | |
3724 | { | |
3725 | case EQ_EXPR: val = (cmp != 0); break; | |
3726 | case NE_EXPR: val = (cmp == 0); break; | |
3727 | case LT_EXPR: val = (cmp >= 0); break; | |
3728 | case GT_EXPR: val = (cmp <= 0); break; | |
3729 | case LE_EXPR: val = (cmp > 0); break; | |
3730 | case GE_EXPR: val = (cmp < 0); break; | |
3731 | default: | |
3732 | val = false; | |
3733 | } | |
3734 | if (val) | |
3735 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
3736 | } | |
3737 | else if (code2 == NE_EXPR) | |
3738 | { | |
3739 | bool val; | |
3740 | switch (code1) | |
3741 | { | |
3742 | case EQ_EXPR: val = (cmp == 0); break; | |
3743 | case NE_EXPR: val = (cmp != 0); break; | |
3744 | case LT_EXPR: val = (cmp <= 0); break; | |
3745 | case GT_EXPR: val = (cmp >= 0); break; | |
3746 | case LE_EXPR: val = (cmp < 0); break; | |
3747 | case GE_EXPR: val = (cmp > 0); break; | |
3748 | default: | |
3749 | val = false; | |
3750 | } | |
3751 | if (val) | |
3752 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
3753 | } | |
3754 | ||
3755 | /* Chose the more restrictive of two < or <= comparisons. */ | |
3756 | else if ((code1 == LT_EXPR || code1 == LE_EXPR) | |
3757 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
3758 | { | |
3759 | if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR)) | |
3760 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
3761 | else | |
3762 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
3763 | } | |
3764 | ||
3765 | /* Likewise chose the more restrictive of two > or >= comparisons. */ | |
3766 | else if ((code1 == GT_EXPR || code1 == GE_EXPR) | |
3767 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
3768 | { | |
3769 | if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR)) | |
3770 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
3771 | else | |
3772 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
3773 | } | |
3774 | ||
3775 | /* Check for singleton ranges. */ | |
3776 | else if (cmp == 0 | |
3777 | && ((code1 == LE_EXPR && code2 == GE_EXPR) | |
3778 | || (code1 == GE_EXPR && code2 == LE_EXPR))) | |
3779 | return fold_build2 (EQ_EXPR, boolean_type_node, op1a, op2b); | |
3780 | ||
3781 | /* Check for disjoint ranges. */ | |
3782 | else if (cmp <= 0 | |
3783 | && (code1 == LT_EXPR || code1 == LE_EXPR) | |
3784 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
3785 | return boolean_false_node; | |
3786 | else if (cmp >= 0 | |
3787 | && (code1 == GT_EXPR || code1 == GE_EXPR) | |
3788 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
3789 | return boolean_false_node; | |
3790 | } | |
3791 | ||
3792 | /* Perhaps the first comparison is (NAME != 0) or (NAME == 1) where | |
3793 | NAME's definition is a truth value. See if there are any simplifications | |
3794 | that can be done against the NAME's definition. */ | |
3795 | if (TREE_CODE (op1a) == SSA_NAME | |
3796 | && (code1 == NE_EXPR || code1 == EQ_EXPR) | |
3797 | && (integer_zerop (op1b) || integer_onep (op1b))) | |
3798 | { | |
3799 | bool invert = ((code1 == EQ_EXPR && integer_zerop (op1b)) | |
3800 | || (code1 == NE_EXPR && integer_onep (op1b))); | |
3801 | gimple stmt = SSA_NAME_DEF_STMT (op1a); | |
3802 | switch (gimple_code (stmt)) | |
3803 | { | |
3804 | case GIMPLE_ASSIGN: | |
3805 | /* Try to simplify by copy-propagating the definition. */ | |
3806 | return and_var_with_comparison (op1a, invert, code2, op2a, op2b); | |
3807 | ||
3808 | case GIMPLE_PHI: | |
3809 | /* If every argument to the PHI produces the same result when | |
3810 | ANDed with the second comparison, we win. | |
3811 | Do not do this unless the type is bool since we need a bool | |
3812 | result here anyway. */ | |
3813 | if (TREE_CODE (TREE_TYPE (op1a)) == BOOLEAN_TYPE) | |
3814 | { | |
3815 | tree result = NULL_TREE; | |
3816 | unsigned i; | |
3817 | for (i = 0; i < gimple_phi_num_args (stmt); i++) | |
3818 | { | |
3819 | tree arg = gimple_phi_arg_def (stmt, i); | |
3820 | ||
3821 | /* If this PHI has itself as an argument, ignore it. | |
3822 | If all the other args produce the same result, | |
3823 | we're still OK. */ | |
3824 | if (arg == gimple_phi_result (stmt)) | |
3825 | continue; | |
3826 | else if (TREE_CODE (arg) == INTEGER_CST) | |
3827 | { | |
3828 | if (invert ? integer_nonzerop (arg) : integer_zerop (arg)) | |
3829 | { | |
3830 | if (!result) | |
3831 | result = boolean_false_node; | |
3832 | else if (!integer_zerop (result)) | |
3833 | return NULL_TREE; | |
3834 | } | |
3835 | else if (!result) | |
3836 | result = fold_build2 (code2, boolean_type_node, | |
3837 | op2a, op2b); | |
3838 | else if (!same_bool_comparison_p (result, | |
3839 | code2, op2a, op2b)) | |
3840 | return NULL_TREE; | |
3841 | } | |
0e8b84ec JJ |
3842 | else if (TREE_CODE (arg) == SSA_NAME |
3843 | && !SSA_NAME_IS_DEFAULT_DEF (arg)) | |
e89065a1 | 3844 | { |
6c66f733 JJ |
3845 | tree temp; |
3846 | gimple def_stmt = SSA_NAME_DEF_STMT (arg); | |
3847 | /* In simple cases we can look through PHI nodes, | |
3848 | but we have to be careful with loops. | |
3849 | See PR49073. */ | |
3850 | if (! dom_info_available_p (CDI_DOMINATORS) | |
3851 | || gimple_bb (def_stmt) == gimple_bb (stmt) | |
3852 | || dominated_by_p (CDI_DOMINATORS, | |
3853 | gimple_bb (def_stmt), | |
3854 | gimple_bb (stmt))) | |
3855 | return NULL_TREE; | |
3856 | temp = and_var_with_comparison (arg, invert, code2, | |
3857 | op2a, op2b); | |
e89065a1 SL |
3858 | if (!temp) |
3859 | return NULL_TREE; | |
3860 | else if (!result) | |
3861 | result = temp; | |
3862 | else if (!same_bool_result_p (result, temp)) | |
3863 | return NULL_TREE; | |
3864 | } | |
3865 | else | |
3866 | return NULL_TREE; | |
3867 | } | |
3868 | return result; | |
3869 | } | |
3870 | ||
3871 | default: | |
3872 | break; | |
3873 | } | |
3874 | } | |
3875 | return NULL_TREE; | |
3876 | } | |
3877 | ||
3878 | /* Try to simplify the AND of two comparisons, specified by | |
3879 | (OP1A CODE1 OP1B) and (OP2B CODE2 OP2B), respectively. | |
3880 | If this can be simplified to a single expression (without requiring | |
3881 | introducing more SSA variables to hold intermediate values), | |
3882 | return the resulting tree. Otherwise return NULL_TREE. | |
3883 | If the result expression is non-null, it has boolean type. */ | |
3884 | ||
3885 | tree | |
3886 | maybe_fold_and_comparisons (enum tree_code code1, tree op1a, tree op1b, | |
3887 | enum tree_code code2, tree op2a, tree op2b) | |
3888 | { | |
3889 | tree t = and_comparisons_1 (code1, op1a, op1b, code2, op2a, op2b); | |
3890 | if (t) | |
3891 | return t; | |
3892 | else | |
3893 | return and_comparisons_1 (code2, op2a, op2b, code1, op1a, op1b); | |
3894 | } | |
3895 | ||
3896 | /* Helper function for or_comparisons_1: try to simplify the OR of the | |
3897 | ssa variable VAR with the comparison specified by (OP2A CODE2 OP2B). | |
3898 | If INVERT is true, invert the value of VAR before doing the OR. | |
3899 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
3900 | ||
3901 | static tree | |
3902 | or_var_with_comparison (tree var, bool invert, | |
3903 | enum tree_code code2, tree op2a, tree op2b) | |
3904 | { | |
3905 | tree t; | |
3906 | gimple stmt = SSA_NAME_DEF_STMT (var); | |
3907 | ||
3908 | /* We can only deal with variables whose definitions are assignments. */ | |
3909 | if (!is_gimple_assign (stmt)) | |
3910 | return NULL_TREE; | |
3911 | ||
3912 | /* If we have an inverted comparison, apply DeMorgan's law and rewrite | |
3913 | !var OR (op2a code2 op2b) => !(var AND !(op2a code2 op2b)) | |
3914 | Then we only have to consider the simpler non-inverted cases. */ | |
3915 | if (invert) | |
3916 | t = and_var_with_comparison_1 (stmt, | |
3917 | invert_tree_comparison (code2, false), | |
3918 | op2a, op2b); | |
3919 | else | |
3920 | t = or_var_with_comparison_1 (stmt, code2, op2a, op2b); | |
3921 | return canonicalize_bool (t, invert); | |
3922 | } | |
3923 | ||
3924 | /* Try to simplify the OR of the ssa variable defined by the assignment | |
3925 | STMT with the comparison specified by (OP2A CODE2 OP2B). | |
3926 | Return NULL_EXPR if we can't simplify this to a single expression. */ | |
3927 | ||
3928 | static tree | |
3929 | or_var_with_comparison_1 (gimple stmt, | |
3930 | enum tree_code code2, tree op2a, tree op2b) | |
3931 | { | |
3932 | tree var = gimple_assign_lhs (stmt); | |
3933 | tree true_test_var = NULL_TREE; | |
3934 | tree false_test_var = NULL_TREE; | |
3935 | enum tree_code innercode = gimple_assign_rhs_code (stmt); | |
3936 | ||
3937 | /* Check for identities like (var OR (var != 0)) => true . */ | |
3938 | if (TREE_CODE (op2a) == SSA_NAME | |
3939 | && TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE) | |
3940 | { | |
3941 | if ((code2 == NE_EXPR && integer_zerop (op2b)) | |
3942 | || (code2 == EQ_EXPR && integer_nonzerop (op2b))) | |
3943 | { | |
3944 | true_test_var = op2a; | |
3945 | if (var == true_test_var) | |
3946 | return var; | |
3947 | } | |
3948 | else if ((code2 == EQ_EXPR && integer_zerop (op2b)) | |
3949 | || (code2 == NE_EXPR && integer_nonzerop (op2b))) | |
3950 | { | |
3951 | false_test_var = op2a; | |
3952 | if (var == false_test_var) | |
3953 | return boolean_true_node; | |
3954 | } | |
3955 | } | |
3956 | ||
3957 | /* If the definition is a comparison, recurse on it. */ | |
3958 | if (TREE_CODE_CLASS (innercode) == tcc_comparison) | |
3959 | { | |
3960 | tree t = or_comparisons_1 (innercode, | |
3961 | gimple_assign_rhs1 (stmt), | |
3962 | gimple_assign_rhs2 (stmt), | |
3963 | code2, | |
3964 | op2a, | |
3965 | op2b); | |
3966 | if (t) | |
3967 | return t; | |
3968 | } | |
3969 | ||
3970 | /* If the definition is an AND or OR expression, we may be able to | |
3971 | simplify by reassociating. */ | |
eb9820c0 KT |
3972 | if (TREE_CODE (TREE_TYPE (var)) == BOOLEAN_TYPE |
3973 | && (innercode == BIT_AND_EXPR || innercode == BIT_IOR_EXPR)) | |
e89065a1 SL |
3974 | { |
3975 | tree inner1 = gimple_assign_rhs1 (stmt); | |
3976 | tree inner2 = gimple_assign_rhs2 (stmt); | |
3977 | gimple s; | |
3978 | tree t; | |
3979 | tree partial = NULL_TREE; | |
eb9820c0 | 3980 | bool is_or = (innercode == BIT_IOR_EXPR); |
e89065a1 SL |
3981 | |
3982 | /* Check for boolean identities that don't require recursive examination | |
3983 | of inner1/inner2: | |
3984 | inner1 OR (inner1 OR inner2) => inner1 OR inner2 => var | |
3985 | inner1 OR (inner1 AND inner2) => inner1 | |
3986 | !inner1 OR (inner1 OR inner2) => true | |
3987 | !inner1 OR (inner1 AND inner2) => !inner1 OR inner2 | |
3988 | */ | |
3989 | if (inner1 == true_test_var) | |
3990 | return (is_or ? var : inner1); | |
3991 | else if (inner2 == true_test_var) | |
3992 | return (is_or ? var : inner2); | |
3993 | else if (inner1 == false_test_var) | |
3994 | return (is_or | |
3995 | ? boolean_true_node | |
3996 | : or_var_with_comparison (inner2, false, code2, op2a, op2b)); | |
3997 | else if (inner2 == false_test_var) | |
3998 | return (is_or | |
3999 | ? boolean_true_node | |
4000 | : or_var_with_comparison (inner1, false, code2, op2a, op2b)); | |
4001 | ||
4002 | /* Next, redistribute/reassociate the OR across the inner tests. | |
4003 | Compute the first partial result, (inner1 OR (op2a code op2b)) */ | |
4004 | if (TREE_CODE (inner1) == SSA_NAME | |
4005 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner1)) | |
4006 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
4007 | && (t = maybe_fold_or_comparisons (gimple_assign_rhs_code (s), | |
4008 | gimple_assign_rhs1 (s), | |
4009 | gimple_assign_rhs2 (s), | |
4010 | code2, op2a, op2b))) | |
4011 | { | |
4012 | /* Handle the OR case, where we are reassociating: | |
4013 | (inner1 OR inner2) OR (op2a code2 op2b) | |
4014 | => (t OR inner2) | |
4015 | If the partial result t is a constant, we win. Otherwise | |
4016 | continue on to try reassociating with the other inner test. */ | |
8236c8eb | 4017 | if (is_or) |
e89065a1 SL |
4018 | { |
4019 | if (integer_onep (t)) | |
4020 | return boolean_true_node; | |
4021 | else if (integer_zerop (t)) | |
4022 | return inner2; | |
4023 | } | |
4024 | ||
4025 | /* Handle the AND case, where we are redistributing: | |
4026 | (inner1 AND inner2) OR (op2a code2 op2b) | |
4027 | => (t AND (inner2 OR (op2a code op2b))) */ | |
8236c8eb JJ |
4028 | else if (integer_zerop (t)) |
4029 | return boolean_false_node; | |
4030 | ||
4031 | /* Save partial result for later. */ | |
4032 | partial = t; | |
e89065a1 SL |
4033 | } |
4034 | ||
4035 | /* Compute the second partial result, (inner2 OR (op2a code op2b)) */ | |
4036 | if (TREE_CODE (inner2) == SSA_NAME | |
4037 | && is_gimple_assign (s = SSA_NAME_DEF_STMT (inner2)) | |
4038 | && TREE_CODE_CLASS (gimple_assign_rhs_code (s)) == tcc_comparison | |
4039 | && (t = maybe_fold_or_comparisons (gimple_assign_rhs_code (s), | |
4040 | gimple_assign_rhs1 (s), | |
4041 | gimple_assign_rhs2 (s), | |
4042 | code2, op2a, op2b))) | |
4043 | { | |
4044 | /* Handle the OR case, where we are reassociating: | |
4045 | (inner1 OR inner2) OR (op2a code2 op2b) | |
8236c8eb JJ |
4046 | => (inner1 OR t) |
4047 | => (t OR partial) */ | |
4048 | if (is_or) | |
e89065a1 SL |
4049 | { |
4050 | if (integer_zerop (t)) | |
4051 | return inner1; | |
4052 | else if (integer_onep (t)) | |
4053 | return boolean_true_node; | |
8236c8eb JJ |
4054 | /* If both are the same, we can apply the identity |
4055 | (x OR x) == x. */ | |
4056 | else if (partial && same_bool_result_p (t, partial)) | |
4057 | return t; | |
e89065a1 SL |
4058 | } |
4059 | ||
4060 | /* Handle the AND case, where we are redistributing: | |
4061 | (inner1 AND inner2) OR (op2a code2 op2b) | |
4062 | => (t AND (inner1 OR (op2a code2 op2b))) | |
4063 | => (t AND partial) */ | |
4064 | else | |
4065 | { | |
4066 | if (integer_zerop (t)) | |
4067 | return boolean_false_node; | |
4068 | else if (partial) | |
4069 | { | |
4070 | /* We already got a simplification for the other | |
4071 | operand to the redistributed AND expression. The | |
4072 | interesting case is when at least one is true. | |
4073 | Or, if both are the same, we can apply the identity | |
8236c8eb | 4074 | (x AND x) == x. */ |
e89065a1 SL |
4075 | if (integer_onep (partial)) |
4076 | return t; | |
4077 | else if (integer_onep (t)) | |
4078 | return partial; | |
4079 | else if (same_bool_result_p (t, partial)) | |
8236c8eb | 4080 | return t; |
e89065a1 SL |
4081 | } |
4082 | } | |
4083 | } | |
4084 | } | |
4085 | return NULL_TREE; | |
4086 | } | |
4087 | ||
4088 | /* Try to simplify the OR of two comparisons defined by | |
4089 | (OP1A CODE1 OP1B) and (OP2A CODE2 OP2B), respectively. | |
4090 | If this can be done without constructing an intermediate value, | |
4091 | return the resulting tree; otherwise NULL_TREE is returned. | |
4092 | This function is deliberately asymmetric as it recurses on SSA_DEFs | |
4093 | in the first comparison but not the second. */ | |
4094 | ||
4095 | static tree | |
4096 | or_comparisons_1 (enum tree_code code1, tree op1a, tree op1b, | |
4097 | enum tree_code code2, tree op2a, tree op2b) | |
4098 | { | |
ae22ac3c | 4099 | tree truth_type = truth_type_for (TREE_TYPE (op1a)); |
31ed6226 | 4100 | |
e89065a1 SL |
4101 | /* First check for ((x CODE1 y) OR (x CODE2 y)). */ |
4102 | if (operand_equal_p (op1a, op2a, 0) | |
4103 | && operand_equal_p (op1b, op2b, 0)) | |
4104 | { | |
eb9820c0 | 4105 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
4106 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
4107 | TRUTH_ORIF_EXPR, code1, code2, | |
31ed6226 | 4108 | truth_type, op1a, op1b); |
e89065a1 SL |
4109 | if (t) |
4110 | return t; | |
4111 | } | |
4112 | ||
4113 | /* Likewise the swapped case of the above. */ | |
4114 | if (operand_equal_p (op1a, op2b, 0) | |
4115 | && operand_equal_p (op1b, op2a, 0)) | |
4116 | { | |
eb9820c0 | 4117 | /* Result will be either NULL_TREE, or a combined comparison. */ |
e89065a1 SL |
4118 | tree t = combine_comparisons (UNKNOWN_LOCATION, |
4119 | TRUTH_ORIF_EXPR, code1, | |
4120 | swap_tree_comparison (code2), | |
31ed6226 | 4121 | truth_type, op1a, op1b); |
e89065a1 SL |
4122 | if (t) |
4123 | return t; | |
4124 | } | |
4125 | ||
4126 | /* If both comparisons are of the same value against constants, we might | |
4127 | be able to merge them. */ | |
4128 | if (operand_equal_p (op1a, op2a, 0) | |
4129 | && TREE_CODE (op1b) == INTEGER_CST | |
4130 | && TREE_CODE (op2b) == INTEGER_CST) | |
4131 | { | |
4132 | int cmp = tree_int_cst_compare (op1b, op2b); | |
4133 | ||
4134 | /* If we have (op1a != op1b), we should either be able to | |
4135 | return that or TRUE, depending on whether the constant op1b | |
4136 | also satisfies the other comparison against op2b. */ | |
4137 | if (code1 == NE_EXPR) | |
4138 | { | |
4139 | bool done = true; | |
4140 | bool val; | |
4141 | switch (code2) | |
4142 | { | |
4143 | case EQ_EXPR: val = (cmp == 0); break; | |
4144 | case NE_EXPR: val = (cmp != 0); break; | |
4145 | case LT_EXPR: val = (cmp < 0); break; | |
4146 | case GT_EXPR: val = (cmp > 0); break; | |
4147 | case LE_EXPR: val = (cmp <= 0); break; | |
4148 | case GE_EXPR: val = (cmp >= 0); break; | |
4149 | default: done = false; | |
4150 | } | |
4151 | if (done) | |
4152 | { | |
4153 | if (val) | |
4154 | return boolean_true_node; | |
4155 | else | |
4156 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4157 | } | |
4158 | } | |
4159 | /* Likewise if the second comparison is a != comparison. */ | |
4160 | else if (code2 == NE_EXPR) | |
4161 | { | |
4162 | bool done = true; | |
4163 | bool val; | |
4164 | switch (code1) | |
4165 | { | |
4166 | case EQ_EXPR: val = (cmp == 0); break; | |
4167 | case NE_EXPR: val = (cmp != 0); break; | |
4168 | case LT_EXPR: val = (cmp > 0); break; | |
4169 | case GT_EXPR: val = (cmp < 0); break; | |
4170 | case LE_EXPR: val = (cmp >= 0); break; | |
4171 | case GE_EXPR: val = (cmp <= 0); break; | |
4172 | default: done = false; | |
4173 | } | |
4174 | if (done) | |
4175 | { | |
4176 | if (val) | |
4177 | return boolean_true_node; | |
4178 | else | |
4179 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4180 | } | |
4181 | } | |
4182 | ||
4183 | /* See if an equality test is redundant with the other comparison. */ | |
4184 | else if (code1 == EQ_EXPR) | |
4185 | { | |
4186 | bool val; | |
4187 | switch (code2) | |
4188 | { | |
4189 | case EQ_EXPR: val = (cmp == 0); break; | |
4190 | case NE_EXPR: val = (cmp != 0); break; | |
4191 | case LT_EXPR: val = (cmp < 0); break; | |
4192 | case GT_EXPR: val = (cmp > 0); break; | |
4193 | case LE_EXPR: val = (cmp <= 0); break; | |
4194 | case GE_EXPR: val = (cmp >= 0); break; | |
4195 | default: | |
4196 | val = false; | |
4197 | } | |
4198 | if (val) | |
4199 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4200 | } | |
4201 | else if (code2 == EQ_EXPR) | |
4202 | { | |
4203 | bool val; | |
4204 | switch (code1) | |
4205 | { | |
4206 | case EQ_EXPR: val = (cmp == 0); break; | |
4207 | case NE_EXPR: val = (cmp != 0); break; | |
4208 | case LT_EXPR: val = (cmp > 0); break; | |
4209 | case GT_EXPR: val = (cmp < 0); break; | |
4210 | case LE_EXPR: val = (cmp >= 0); break; | |
4211 | case GE_EXPR: val = (cmp <= 0); break; | |
4212 | default: | |
4213 | val = false; | |
4214 | } | |
4215 | if (val) | |
4216 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4217 | } | |
4218 | ||
4219 | /* Chose the less restrictive of two < or <= comparisons. */ | |
4220 | else if ((code1 == LT_EXPR || code1 == LE_EXPR) | |
4221 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
4222 | { | |
4223 | if ((cmp < 0) || (cmp == 0 && code1 == LT_EXPR)) | |
4224 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4225 | else | |
4226 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4227 | } | |
4228 | ||
4229 | /* Likewise chose the less restrictive of two > or >= comparisons. */ | |
4230 | else if ((code1 == GT_EXPR || code1 == GE_EXPR) | |
4231 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
4232 | { | |
4233 | if ((cmp > 0) || (cmp == 0 && code1 == GT_EXPR)) | |
4234 | return fold_build2 (code2, boolean_type_node, op2a, op2b); | |
4235 | else | |
4236 | return fold_build2 (code1, boolean_type_node, op1a, op1b); | |
4237 | } | |
4238 | ||
4239 | /* Check for singleton ranges. */ | |
4240 | else if (cmp == 0 | |
4241 | && ((code1 == LT_EXPR && code2 == GT_EXPR) | |
4242 | || (code1 == GT_EXPR && code2 == LT_EXPR))) | |
4243 | return fold_build2 (NE_EXPR, boolean_type_node, op1a, op2b); | |
4244 | ||
4245 | /* Check for less/greater pairs that don't restrict the range at all. */ | |
4246 | else if (cmp >= 0 | |
4247 | && (code1 == LT_EXPR || code1 == LE_EXPR) | |
4248 | && (code2 == GT_EXPR || code2 == GE_EXPR)) | |
4249 | return boolean_true_node; | |
4250 | else if (cmp <= 0 | |
4251 | && (code1 == GT_EXPR || code1 == GE_EXPR) | |
4252 | && (code2 == LT_EXPR || code2 == LE_EXPR)) | |
4253 | return boolean_true_node; | |
4254 | } | |
4255 | ||
4256 | /* Perhaps the first comparison is (NAME != 0) or (NAME == 1) where | |
4257 | NAME's definition is a truth value. See if there are any simplifications | |
4258 | that can be done against the NAME's definition. */ | |
4259 | if (TREE_CODE (op1a) == SSA_NAME | |
4260 | && (code1 == NE_EXPR || code1 == EQ_EXPR) | |
4261 | && (integer_zerop (op1b) || integer_onep (op1b))) | |
4262 | { | |
4263 | bool invert = ((code1 == EQ_EXPR && integer_zerop (op1b)) | |
4264 | || (code1 == NE_EXPR && integer_onep (op1b))); | |
4265 | gimple stmt = SSA_NAME_DEF_STMT (op1a); | |
4266 | switch (gimple_code (stmt)) | |
4267 | { | |
4268 | case GIMPLE_ASSIGN: | |
4269 | /* Try to simplify by copy-propagating the definition. */ | |
4270 | return or_var_with_comparison (op1a, invert, code2, op2a, op2b); | |
4271 | ||
4272 | case GIMPLE_PHI: | |
4273 | /* If every argument to the PHI produces the same result when | |
4274 | ORed with the second comparison, we win. | |
4275 | Do not do this unless the type is bool since we need a bool | |
4276 | result here anyway. */ | |
4277 | if (TREE_CODE (TREE_TYPE (op1a)) == BOOLEAN_TYPE) | |
4278 | { | |
4279 | tree result = NULL_TREE; | |
4280 | unsigned i; | |
4281 | for (i = 0; i < gimple_phi_num_args (stmt); i++) | |
4282 | { | |
4283 | tree arg = gimple_phi_arg_def (stmt, i); | |
4284 | ||
4285 | /* If this PHI has itself as an argument, ignore it. | |
4286 | If all the other args produce the same result, | |
4287 | we're still OK. */ | |
4288 | if (arg == gimple_phi_result (stmt)) | |
4289 | continue; | |
4290 | else if (TREE_CODE (arg) == INTEGER_CST) | |
4291 | { | |
4292 | if (invert ? integer_zerop (arg) : integer_nonzerop (arg)) | |
4293 | { | |
4294 | if (!result) | |
4295 | result = boolean_true_node; | |
4296 | else if (!integer_onep (result)) | |
4297 | return NULL_TREE; | |
4298 | } | |
4299 | else if (!result) | |
4300 | result = fold_build2 (code2, boolean_type_node, | |
4301 | op2a, op2b); | |
4302 | else if (!same_bool_comparison_p (result, | |
4303 | code2, op2a, op2b)) | |
4304 | return NULL_TREE; | |
4305 | } | |
0e8b84ec JJ |
4306 | else if (TREE_CODE (arg) == SSA_NAME |
4307 | && !SSA_NAME_IS_DEFAULT_DEF (arg)) | |
e89065a1 | 4308 | { |
6c66f733 JJ |
4309 | tree temp; |
4310 | gimple def_stmt = SSA_NAME_DEF_STMT (arg); | |
4311 | /* In simple cases we can look through PHI nodes, | |
4312 | but we have to be careful with loops. | |
4313 | See PR49073. */ | |
4314 | if (! dom_info_available_p (CDI_DOMINATORS) | |
4315 | || gimple_bb (def_stmt) == gimple_bb (stmt) | |
4316 | || dominated_by_p (CDI_DOMINATORS, | |
4317 | gimple_bb (def_stmt), | |
4318 | gimple_bb (stmt))) | |
4319 | return NULL_TREE; | |
4320 | temp = or_var_with_comparison (arg, invert, code2, | |
4321 | op2a, op2b); | |
e89065a1 SL |
4322 | if (!temp) |
4323 | return NULL_TREE; | |
4324 | else if (!result) | |
4325 | result = temp; | |
4326 | else if (!same_bool_result_p (result, temp)) | |
4327 | return NULL_TREE; | |
4328 | } | |
4329 | else | |
4330 | return NULL_TREE; | |
4331 | } | |
4332 | return result; | |
4333 | } | |
4334 | ||
4335 | default: | |
4336 | break; | |
4337 | } | |
4338 | } | |
4339 | return NULL_TREE; | |
4340 | } | |
4341 | ||
4342 | /* Try to simplify the OR of two comparisons, specified by | |
4343 | (OP1A CODE1 OP1B) and (OP2B CODE2 OP2B), respectively. | |
4344 | If this can be simplified to a single expression (without requiring | |
4345 | introducing more SSA variables to hold intermediate values), | |
4346 | return the resulting tree. Otherwise return NULL_TREE. | |
4347 | If the result expression is non-null, it has boolean type. */ | |
4348 | ||
4349 | tree | |
4350 | maybe_fold_or_comparisons (enum tree_code code1, tree op1a, tree op1b, | |
4351 | enum tree_code code2, tree op2a, tree op2b) | |
4352 | { | |
4353 | tree t = or_comparisons_1 (code1, op1a, op1b, code2, op2a, op2b); | |
4354 | if (t) | |
4355 | return t; | |
4356 | else | |
4357 | return or_comparisons_1 (code2, op2a, op2b, code1, op1a, op1b); | |
4358 | } | |
cfef45c8 RG |
4359 | |
4360 | ||
4361 | /* Fold STMT to a constant using VALUEIZE to valueize SSA names. | |
4362 | ||
4363 | Either NULL_TREE, a simplified but non-constant or a constant | |
4364 | is returned. | |
4365 | ||
4366 | ??? This should go into a gimple-fold-inline.h file to be eventually | |
4367 | privatized with the single valueize function used in the various TUs | |
4368 | to avoid the indirect function call overhead. */ | |
4369 | ||
4370 | tree | |
4371 | gimple_fold_stmt_to_constant_1 (gimple stmt, tree (*valueize) (tree)) | |
4372 | { | |
45cc9f96 RB |
4373 | code_helper rcode; |
4374 | tree ops[3] = {}; | |
4375 | /* ??? The SSA propagators do not correctly deal with following SSA use-def | |
4376 | edges if there are intermediate VARYING defs. For this reason | |
4377 | do not follow SSA edges here even though SCCVN can technically | |
4378 | just deal fine with that. */ | |
4379 | if (gimple_simplify (stmt, &rcode, ops, NULL, no_follow_ssa_edges) | |
4380 | && rcode.is_tree_code () | |
4381 | && (TREE_CODE_LENGTH ((tree_code) rcode) == 0 | |
4382 | || ((tree_code) rcode) == ADDR_EXPR) | |
4383 | && is_gimple_val (ops[0])) | |
4384 | { | |
4385 | tree res = ops[0]; | |
4386 | if (dump_file && dump_flags & TDF_DETAILS) | |
4387 | { | |
4388 | fprintf (dump_file, "Match-and-simplified "); | |
4389 | print_gimple_expr (dump_file, stmt, 0, TDF_SLIM); | |
4390 | fprintf (dump_file, " to "); | |
4391 | print_generic_expr (dump_file, res, 0); | |
4392 | fprintf (dump_file, "\n"); | |
4393 | } | |
4394 | return res; | |
4395 | } | |
4396 | ||
cfef45c8 RG |
4397 | location_t loc = gimple_location (stmt); |
4398 | switch (gimple_code (stmt)) | |
4399 | { | |
4400 | case GIMPLE_ASSIGN: | |
4401 | { | |
4402 | enum tree_code subcode = gimple_assign_rhs_code (stmt); | |
4403 | ||
4404 | switch (get_gimple_rhs_class (subcode)) | |
4405 | { | |
4406 | case GIMPLE_SINGLE_RHS: | |
4407 | { | |
4408 | tree rhs = gimple_assign_rhs1 (stmt); | |
4409 | enum tree_code_class kind = TREE_CODE_CLASS (subcode); | |
4410 | ||
4411 | if (TREE_CODE (rhs) == SSA_NAME) | |
4412 | { | |
4413 | /* If the RHS is an SSA_NAME, return its known constant value, | |
4414 | if any. */ | |
4415 | return (*valueize) (rhs); | |
4416 | } | |
4417 | /* Handle propagating invariant addresses into address | |
4418 | operations. */ | |
4419 | else if (TREE_CODE (rhs) == ADDR_EXPR | |
4420 | && !is_gimple_min_invariant (rhs)) | |
4421 | { | |
d25c4172 | 4422 | HOST_WIDE_INT offset = 0; |
cfef45c8 RG |
4423 | tree base; |
4424 | base = get_addr_base_and_unit_offset_1 (TREE_OPERAND (rhs, 0), | |
4425 | &offset, | |
4426 | valueize); | |
4427 | if (base | |
4428 | && (CONSTANT_CLASS_P (base) | |
4429 | || decl_address_invariant_p (base))) | |
4430 | return build_invariant_address (TREE_TYPE (rhs), | |
4431 | base, offset); | |
4432 | } | |
4433 | else if (TREE_CODE (rhs) == CONSTRUCTOR | |
4434 | && TREE_CODE (TREE_TYPE (rhs)) == VECTOR_TYPE | |
4435 | && (CONSTRUCTOR_NELTS (rhs) | |
4436 | == TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs)))) | |
4437 | { | |
4438 | unsigned i; | |
d2a12ae7 | 4439 | tree val, *vec; |
cfef45c8 | 4440 | |
d2a12ae7 RG |
4441 | vec = XALLOCAVEC (tree, |
4442 | TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs))); | |
cfef45c8 RG |
4443 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (rhs), i, val) |
4444 | { | |
4445 | val = (*valueize) (val); | |
4446 | if (TREE_CODE (val) == INTEGER_CST | |
4447 | || TREE_CODE (val) == REAL_CST | |
4448 | || TREE_CODE (val) == FIXED_CST) | |
d2a12ae7 | 4449 | vec[i] = val; |
cfef45c8 RG |
4450 | else |
4451 | return NULL_TREE; | |
4452 | } | |
4453 | ||
d2a12ae7 | 4454 | return build_vector (TREE_TYPE (rhs), vec); |
cfef45c8 | 4455 | } |
bdf37f7a JH |
4456 | if (subcode == OBJ_TYPE_REF) |
4457 | { | |
4458 | tree val = (*valueize) (OBJ_TYPE_REF_EXPR (rhs)); | |
4459 | /* If callee is constant, we can fold away the wrapper. */ | |
4460 | if (is_gimple_min_invariant (val)) | |
4461 | return val; | |
4462 | } | |
cfef45c8 RG |
4463 | |
4464 | if (kind == tcc_reference) | |
4465 | { | |
4466 | if ((TREE_CODE (rhs) == VIEW_CONVERT_EXPR | |
4467 | || TREE_CODE (rhs) == REALPART_EXPR | |
4468 | || TREE_CODE (rhs) == IMAGPART_EXPR) | |
4469 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) | |
4470 | { | |
4471 | tree val = (*valueize) (TREE_OPERAND (rhs, 0)); | |
4472 | return fold_unary_loc (EXPR_LOCATION (rhs), | |
4473 | TREE_CODE (rhs), | |
4474 | TREE_TYPE (rhs), val); | |
4475 | } | |
4476 | else if (TREE_CODE (rhs) == BIT_FIELD_REF | |
4477 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) | |
4478 | { | |
4479 | tree val = (*valueize) (TREE_OPERAND (rhs, 0)); | |
4480 | return fold_ternary_loc (EXPR_LOCATION (rhs), | |
4481 | TREE_CODE (rhs), | |
4482 | TREE_TYPE (rhs), val, | |
4483 | TREE_OPERAND (rhs, 1), | |
4484 | TREE_OPERAND (rhs, 2)); | |
4485 | } | |
4486 | else if (TREE_CODE (rhs) == MEM_REF | |
4487 | && TREE_CODE (TREE_OPERAND (rhs, 0)) == SSA_NAME) | |
4488 | { | |
4489 | tree val = (*valueize) (TREE_OPERAND (rhs, 0)); | |
4490 | if (TREE_CODE (val) == ADDR_EXPR | |
4491 | && is_gimple_min_invariant (val)) | |
4492 | { | |
4493 | tree tem = fold_build2 (MEM_REF, TREE_TYPE (rhs), | |
4494 | unshare_expr (val), | |
4495 | TREE_OPERAND (rhs, 1)); | |
4496 | if (tem) | |
4497 | rhs = tem; | |
4498 | } | |
4499 | } | |
4500 | return fold_const_aggregate_ref_1 (rhs, valueize); | |
4501 | } | |
4502 | else if (kind == tcc_declaration) | |
4503 | return get_symbol_constant_value (rhs); | |
4504 | return rhs; | |
4505 | } | |
4506 | ||
4507 | case GIMPLE_UNARY_RHS: | |
f3582e54 | 4508 | return NULL_TREE; |
cfef45c8 RG |
4509 | |
4510 | case GIMPLE_BINARY_RHS: | |
4511 | { | |
4512 | /* Handle binary operators that can appear in GIMPLE form. */ | |
4513 | tree op0 = (*valueize) (gimple_assign_rhs1 (stmt)); | |
4514 | tree op1 = (*valueize) (gimple_assign_rhs2 (stmt)); | |
4515 | ||
4516 | /* Translate &x + CST into an invariant form suitable for | |
4517 | further propagation. */ | |
4518 | if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR | |
4519 | && TREE_CODE (op0) == ADDR_EXPR | |
4520 | && TREE_CODE (op1) == INTEGER_CST) | |
4521 | { | |
4522 | tree off = fold_convert (ptr_type_node, op1); | |
4d59a001 RG |
4523 | return build_fold_addr_expr_loc |
4524 | (loc, | |
4525 | fold_build2 (MEM_REF, | |
cfef45c8 RG |
4526 | TREE_TYPE (TREE_TYPE (op0)), |
4527 | unshare_expr (op0), off)); | |
4528 | } | |
4529 | ||
4530 | return fold_binary_loc (loc, subcode, | |
4531 | gimple_expr_type (stmt), op0, op1); | |
4532 | } | |
4533 | ||
4534 | case GIMPLE_TERNARY_RHS: | |
4535 | { | |
4536 | /* Handle ternary operators that can appear in GIMPLE form. */ | |
4537 | tree op0 = (*valueize) (gimple_assign_rhs1 (stmt)); | |
4538 | tree op1 = (*valueize) (gimple_assign_rhs2 (stmt)); | |
4539 | tree op2 = (*valueize) (gimple_assign_rhs3 (stmt)); | |
4540 | ||
d3878abf RG |
4541 | /* Fold embedded expressions in ternary codes. */ |
4542 | if ((subcode == COND_EXPR | |
4543 | || subcode == VEC_COND_EXPR) | |
4544 | && COMPARISON_CLASS_P (op0)) | |
4545 | { | |
4546 | tree op00 = (*valueize) (TREE_OPERAND (op0, 0)); | |
4547 | tree op01 = (*valueize) (TREE_OPERAND (op0, 1)); | |
4548 | tree tem = fold_binary_loc (loc, TREE_CODE (op0), | |
4549 | TREE_TYPE (op0), op00, op01); | |
4550 | if (tem) | |
4551 | op0 = tem; | |
4552 | } | |
4553 | ||
cfef45c8 RG |
4554 | return fold_ternary_loc (loc, subcode, |
4555 | gimple_expr_type (stmt), op0, op1, op2); | |
4556 | } | |
4557 | ||
4558 | default: | |
4559 | gcc_unreachable (); | |
4560 | } | |
4561 | } | |
4562 | ||
4563 | case GIMPLE_CALL: | |
4564 | { | |
25583c4f RS |
4565 | tree fn; |
4566 | ||
4567 | if (gimple_call_internal_p (stmt)) | |
31e071ae MP |
4568 | { |
4569 | enum tree_code subcode = ERROR_MARK; | |
4570 | switch (gimple_call_internal_fn (stmt)) | |
4571 | { | |
4572 | case IFN_UBSAN_CHECK_ADD: | |
4573 | subcode = PLUS_EXPR; | |
4574 | break; | |
4575 | case IFN_UBSAN_CHECK_SUB: | |
4576 | subcode = MINUS_EXPR; | |
4577 | break; | |
4578 | case IFN_UBSAN_CHECK_MUL: | |
4579 | subcode = MULT_EXPR; | |
4580 | break; | |
4581 | default: | |
4582 | return NULL_TREE; | |
4583 | } | |
368b454d JJ |
4584 | tree arg0 = gimple_call_arg (stmt, 0); |
4585 | tree arg1 = gimple_call_arg (stmt, 1); | |
4586 | tree op0 = (*valueize) (arg0); | |
4587 | tree op1 = (*valueize) (arg1); | |
31e071ae MP |
4588 | |
4589 | if (TREE_CODE (op0) != INTEGER_CST | |
4590 | || TREE_CODE (op1) != INTEGER_CST) | |
368b454d JJ |
4591 | { |
4592 | switch (subcode) | |
4593 | { | |
4594 | case MULT_EXPR: | |
4595 | /* x * 0 = 0 * x = 0 without overflow. */ | |
4596 | if (integer_zerop (op0) || integer_zerop (op1)) | |
4597 | return build_zero_cst (TREE_TYPE (arg0)); | |
4598 | break; | |
4599 | case MINUS_EXPR: | |
4600 | /* y - y = 0 without overflow. */ | |
4601 | if (operand_equal_p (op0, op1, 0)) | |
4602 | return build_zero_cst (TREE_TYPE (arg0)); | |
4603 | break; | |
4604 | default: | |
4605 | break; | |
4606 | } | |
4607 | } | |
4608 | tree res | |
4609 | = fold_binary_loc (loc, subcode, TREE_TYPE (arg0), op0, op1); | |
31e071ae MP |
4610 | if (res |
4611 | && TREE_CODE (res) == INTEGER_CST | |
4612 | && !TREE_OVERFLOW (res)) | |
4613 | return res; | |
4614 | return NULL_TREE; | |
4615 | } | |
25583c4f RS |
4616 | |
4617 | fn = (*valueize) (gimple_call_fn (stmt)); | |
cfef45c8 RG |
4618 | if (TREE_CODE (fn) == ADDR_EXPR |
4619 | && TREE_CODE (TREE_OPERAND (fn, 0)) == FUNCTION_DECL | |
5c944c6c RB |
4620 | && DECL_BUILT_IN (TREE_OPERAND (fn, 0)) |
4621 | && gimple_builtin_call_types_compatible_p (stmt, | |
4622 | TREE_OPERAND (fn, 0))) | |
cfef45c8 RG |
4623 | { |
4624 | tree *args = XALLOCAVEC (tree, gimple_call_num_args (stmt)); | |
4625 | tree call, retval; | |
4626 | unsigned i; | |
4627 | for (i = 0; i < gimple_call_num_args (stmt); ++i) | |
4628 | args[i] = (*valueize) (gimple_call_arg (stmt, i)); | |
4629 | call = build_call_array_loc (loc, | |
4630 | gimple_call_return_type (stmt), | |
4631 | fn, gimple_call_num_args (stmt), args); | |
4632 | retval = fold_call_expr (EXPR_LOCATION (call), call, false); | |
4633 | if (retval) | |
5c944c6c RB |
4634 | { |
4635 | /* fold_call_expr wraps the result inside a NOP_EXPR. */ | |
4636 | STRIP_NOPS (retval); | |
4637 | retval = fold_convert (gimple_call_return_type (stmt), retval); | |
4638 | } | |
cfef45c8 RG |
4639 | return retval; |
4640 | } | |
4641 | return NULL_TREE; | |
4642 | } | |
4643 | ||
4644 | default: | |
4645 | return NULL_TREE; | |
4646 | } | |
4647 | } | |
4648 | ||
4649 | /* Fold STMT to a constant using VALUEIZE to valueize SSA names. | |
4650 | Returns NULL_TREE if folding to a constant is not possible, otherwise | |
4651 | returns a constant according to is_gimple_min_invariant. */ | |
4652 | ||
4653 | tree | |
4654 | gimple_fold_stmt_to_constant (gimple stmt, tree (*valueize) (tree)) | |
4655 | { | |
4656 | tree res = gimple_fold_stmt_to_constant_1 (stmt, valueize); | |
4657 | if (res && is_gimple_min_invariant (res)) | |
4658 | return res; | |
4659 | return NULL_TREE; | |
4660 | } | |
4661 | ||
4662 | ||
4663 | /* The following set of functions are supposed to fold references using | |
4664 | their constant initializers. */ | |
4665 | ||
4666 | static tree fold_ctor_reference (tree type, tree ctor, | |
4667 | unsigned HOST_WIDE_INT offset, | |
c44c2088 | 4668 | unsigned HOST_WIDE_INT size, tree); |
cfef45c8 RG |
4669 | |
4670 | /* See if we can find constructor defining value of BASE. | |
4671 | When we know the consructor with constant offset (such as | |
4672 | base is array[40] and we do know constructor of array), then | |
4673 | BIT_OFFSET is adjusted accordingly. | |
4674 | ||
4675 | As a special case, return error_mark_node when constructor | |
4676 | is not explicitly available, but it is known to be zero | |
4677 | such as 'static const int a;'. */ | |
4678 | static tree | |
4679 | get_base_constructor (tree base, HOST_WIDE_INT *bit_offset, | |
4680 | tree (*valueize)(tree)) | |
4681 | { | |
4682 | HOST_WIDE_INT bit_offset2, size, max_size; | |
4683 | if (TREE_CODE (base) == MEM_REF) | |
4684 | { | |
4685 | if (!integer_zerop (TREE_OPERAND (base, 1))) | |
4686 | { | |
9541ffee | 4687 | if (!tree_fits_shwi_p (TREE_OPERAND (base, 1))) |
cfef45c8 | 4688 | return NULL_TREE; |
807e902e | 4689 | *bit_offset += (mem_ref_offset (base).to_short_addr () |
cfef45c8 RG |
4690 | * BITS_PER_UNIT); |
4691 | } | |
4692 | ||
4693 | if (valueize | |
4694 | && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME) | |
4695 | base = valueize (TREE_OPERAND (base, 0)); | |
4696 | if (!base || TREE_CODE (base) != ADDR_EXPR) | |
4697 | return NULL_TREE; | |
4698 | base = TREE_OPERAND (base, 0); | |
4699 | } | |
4700 | ||
4701 | /* Get a CONSTRUCTOR. If BASE is a VAR_DECL, get its | |
4702 | DECL_INITIAL. If BASE is a nested reference into another | |
4703 | ARRAY_REF or COMPONENT_REF, make a recursive call to resolve | |
4704 | the inner reference. */ | |
4705 | switch (TREE_CODE (base)) | |
4706 | { | |
4707 | case VAR_DECL: | |
cfef45c8 | 4708 | case CONST_DECL: |
6a6dac52 JH |
4709 | { |
4710 | tree init = ctor_for_folding (base); | |
4711 | ||
688010ba | 4712 | /* Our semantic is exact opposite of ctor_for_folding; |
6a6dac52 JH |
4713 | NULL means unknown, while error_mark_node is 0. */ |
4714 | if (init == error_mark_node) | |
4715 | return NULL_TREE; | |
4716 | if (!init) | |
4717 | return error_mark_node; | |
4718 | return init; | |
4719 | } | |
cfef45c8 RG |
4720 | |
4721 | case ARRAY_REF: | |
4722 | case COMPONENT_REF: | |
4723 | base = get_ref_base_and_extent (base, &bit_offset2, &size, &max_size); | |
4724 | if (max_size == -1 || size != max_size) | |
4725 | return NULL_TREE; | |
4726 | *bit_offset += bit_offset2; | |
4727 | return get_base_constructor (base, bit_offset, valueize); | |
4728 | ||
4729 | case STRING_CST: | |
4730 | case CONSTRUCTOR: | |
4731 | return base; | |
4732 | ||
4733 | default: | |
4734 | return NULL_TREE; | |
4735 | } | |
4736 | } | |
4737 | ||
cfef45c8 RG |
4738 | /* CTOR is CONSTRUCTOR of an array type. Fold reference of type TYPE and size |
4739 | SIZE to the memory at bit OFFSET. */ | |
4740 | ||
4741 | static tree | |
4742 | fold_array_ctor_reference (tree type, tree ctor, | |
4743 | unsigned HOST_WIDE_INT offset, | |
c44c2088 JH |
4744 | unsigned HOST_WIDE_INT size, |
4745 | tree from_decl) | |
cfef45c8 RG |
4746 | { |
4747 | unsigned HOST_WIDE_INT cnt; | |
4748 | tree cfield, cval; | |
807e902e KZ |
4749 | offset_int low_bound; |
4750 | offset_int elt_size; | |
4751 | offset_int index, max_index; | |
4752 | offset_int access_index; | |
b48e22b2 | 4753 | tree domain_type = NULL_TREE, index_type = NULL_TREE; |
cfef45c8 RG |
4754 | HOST_WIDE_INT inner_offset; |
4755 | ||
4756 | /* Compute low bound and elt size. */ | |
eb8f1123 RG |
4757 | if (TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE) |
4758 | domain_type = TYPE_DOMAIN (TREE_TYPE (ctor)); | |
cfef45c8 RG |
4759 | if (domain_type && TYPE_MIN_VALUE (domain_type)) |
4760 | { | |
4761 | /* Static constructors for variably sized objects makes no sense. */ | |
4762 | gcc_assert (TREE_CODE (TYPE_MIN_VALUE (domain_type)) == INTEGER_CST); | |
b48e22b2 | 4763 | index_type = TREE_TYPE (TYPE_MIN_VALUE (domain_type)); |
807e902e | 4764 | low_bound = wi::to_offset (TYPE_MIN_VALUE (domain_type)); |
cfef45c8 RG |
4765 | } |
4766 | else | |
807e902e | 4767 | low_bound = 0; |
cfef45c8 | 4768 | /* Static constructors for variably sized objects makes no sense. */ |
c3284718 | 4769 | gcc_assert (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (ctor)))) |
cfef45c8 | 4770 | == INTEGER_CST); |
807e902e | 4771 | elt_size = wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (ctor)))); |
cfef45c8 RG |
4772 | |
4773 | /* We can handle only constantly sized accesses that are known to not | |
4774 | be larger than size of array element. */ | |
4775 | if (!TYPE_SIZE_UNIT (type) | |
4776 | || TREE_CODE (TYPE_SIZE_UNIT (type)) != INTEGER_CST | |
807e902e KZ |
4777 | || wi::lts_p (elt_size, wi::to_offset (TYPE_SIZE_UNIT (type))) |
4778 | || elt_size == 0) | |
cfef45c8 RG |
4779 | return NULL_TREE; |
4780 | ||
4781 | /* Compute the array index we look for. */ | |
807e902e KZ |
4782 | access_index = wi::udiv_trunc (offset_int (offset / BITS_PER_UNIT), |
4783 | elt_size); | |
27bcd47c | 4784 | access_index += low_bound; |
b48e22b2 | 4785 | if (index_type) |
807e902e KZ |
4786 | access_index = wi::ext (access_index, TYPE_PRECISION (index_type), |
4787 | TYPE_SIGN (index_type)); | |
cfef45c8 RG |
4788 | |
4789 | /* And offset within the access. */ | |
27bcd47c | 4790 | inner_offset = offset % (elt_size.to_uhwi () * BITS_PER_UNIT); |
cfef45c8 RG |
4791 | |
4792 | /* See if the array field is large enough to span whole access. We do not | |
4793 | care to fold accesses spanning multiple array indexes. */ | |
27bcd47c | 4794 | if (inner_offset + size > elt_size.to_uhwi () * BITS_PER_UNIT) |
cfef45c8 RG |
4795 | return NULL_TREE; |
4796 | ||
807e902e | 4797 | index = low_bound - 1; |
b48e22b2 | 4798 | if (index_type) |
807e902e KZ |
4799 | index = wi::ext (index, TYPE_PRECISION (index_type), |
4800 | TYPE_SIGN (index_type)); | |
b48e22b2 | 4801 | |
cfef45c8 RG |
4802 | FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), cnt, cfield, cval) |
4803 | { | |
4804 | /* Array constructor might explicitely set index, or specify range | |
4805 | or leave index NULL meaning that it is next index after previous | |
4806 | one. */ | |
4807 | if (cfield) | |
4808 | { | |
4809 | if (TREE_CODE (cfield) == INTEGER_CST) | |
807e902e | 4810 | max_index = index = wi::to_offset (cfield); |
cfef45c8 RG |
4811 | else |
4812 | { | |
4813 | gcc_assert (TREE_CODE (cfield) == RANGE_EXPR); | |
807e902e KZ |
4814 | index = wi::to_offset (TREE_OPERAND (cfield, 0)); |
4815 | max_index = wi::to_offset (TREE_OPERAND (cfield, 1)); | |
cfef45c8 RG |
4816 | } |
4817 | } | |
4818 | else | |
b48e22b2 | 4819 | { |
807e902e | 4820 | index += 1; |
b48e22b2 | 4821 | if (index_type) |
807e902e KZ |
4822 | index = wi::ext (index, TYPE_PRECISION (index_type), |
4823 | TYPE_SIGN (index_type)); | |
b48e22b2 EB |
4824 | max_index = index; |
4825 | } | |
cfef45c8 RG |
4826 | |
4827 | /* Do we have match? */ | |
807e902e KZ |
4828 | if (wi::cmpu (access_index, index) >= 0 |
4829 | && wi::cmpu (access_index, max_index) <= 0) | |
c44c2088 JH |
4830 | return fold_ctor_reference (type, cval, inner_offset, size, |
4831 | from_decl); | |
cfef45c8 RG |
4832 | } |
4833 | /* When memory is not explicitely mentioned in constructor, | |
4834 | it is 0 (or out of range). */ | |
4835 | return build_zero_cst (type); | |
4836 | } | |
4837 | ||
4838 | /* CTOR is CONSTRUCTOR of an aggregate or vector. | |
4839 | Fold reference of type TYPE and size SIZE to the memory at bit OFFSET. */ | |
4840 | ||
4841 | static tree | |
4842 | fold_nonarray_ctor_reference (tree type, tree ctor, | |
4843 | unsigned HOST_WIDE_INT offset, | |
c44c2088 JH |
4844 | unsigned HOST_WIDE_INT size, |
4845 | tree from_decl) | |
cfef45c8 RG |
4846 | { |
4847 | unsigned HOST_WIDE_INT cnt; | |
4848 | tree cfield, cval; | |
4849 | ||
4850 | FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), cnt, cfield, | |
4851 | cval) | |
4852 | { | |
4853 | tree byte_offset = DECL_FIELD_OFFSET (cfield); | |
4854 | tree field_offset = DECL_FIELD_BIT_OFFSET (cfield); | |
4855 | tree field_size = DECL_SIZE (cfield); | |
807e902e KZ |
4856 | offset_int bitoffset; |
4857 | offset_int bitoffset_end, access_end; | |
cfef45c8 RG |
4858 | |
4859 | /* Variable sized objects in static constructors makes no sense, | |
4860 | but field_size can be NULL for flexible array members. */ | |
4861 | gcc_assert (TREE_CODE (field_offset) == INTEGER_CST | |
4862 | && TREE_CODE (byte_offset) == INTEGER_CST | |
4863 | && (field_size != NULL_TREE | |
4864 | ? TREE_CODE (field_size) == INTEGER_CST | |
4865 | : TREE_CODE (TREE_TYPE (cfield)) == ARRAY_TYPE)); | |
4866 | ||
4867 | /* Compute bit offset of the field. */ | |
807e902e KZ |
4868 | bitoffset = (wi::to_offset (field_offset) |
4869 | + wi::lshift (wi::to_offset (byte_offset), | |
4870 | LOG2_BITS_PER_UNIT)); | |
cfef45c8 RG |
4871 | /* Compute bit offset where the field ends. */ |
4872 | if (field_size != NULL_TREE) | |
807e902e | 4873 | bitoffset_end = bitoffset + wi::to_offset (field_size); |
cfef45c8 | 4874 | else |
807e902e | 4875 | bitoffset_end = 0; |
cfef45c8 | 4876 | |
807e902e | 4877 | access_end = offset_int (offset) + size; |
b8b2b009 JJ |
4878 | |
4879 | /* Is there any overlap between [OFFSET, OFFSET+SIZE) and | |
4880 | [BITOFFSET, BITOFFSET_END)? */ | |
807e902e | 4881 | if (wi::cmps (access_end, bitoffset) > 0 |
cfef45c8 | 4882 | && (field_size == NULL_TREE |
807e902e | 4883 | || wi::lts_p (offset, bitoffset_end))) |
cfef45c8 | 4884 | { |
807e902e | 4885 | offset_int inner_offset = offset_int (offset) - bitoffset; |
cfef45c8 RG |
4886 | /* We do have overlap. Now see if field is large enough to |
4887 | cover the access. Give up for accesses spanning multiple | |
4888 | fields. */ | |
807e902e | 4889 | if (wi::cmps (access_end, bitoffset_end) > 0) |
cfef45c8 | 4890 | return NULL_TREE; |
807e902e | 4891 | if (wi::lts_p (offset, bitoffset)) |
b8b2b009 | 4892 | return NULL_TREE; |
cfef45c8 | 4893 | return fold_ctor_reference (type, cval, |
27bcd47c | 4894 | inner_offset.to_uhwi (), size, |
c44c2088 | 4895 | from_decl); |
cfef45c8 RG |
4896 | } |
4897 | } | |
4898 | /* When memory is not explicitely mentioned in constructor, it is 0. */ | |
4899 | return build_zero_cst (type); | |
4900 | } | |
4901 | ||
4902 | /* CTOR is value initializing memory, fold reference of type TYPE and size SIZE | |
4903 | to the memory at bit OFFSET. */ | |
4904 | ||
4905 | static tree | |
4906 | fold_ctor_reference (tree type, tree ctor, unsigned HOST_WIDE_INT offset, | |
c44c2088 | 4907 | unsigned HOST_WIDE_INT size, tree from_decl) |
cfef45c8 RG |
4908 | { |
4909 | tree ret; | |
4910 | ||
4911 | /* We found the field with exact match. */ | |
4912 | if (useless_type_conversion_p (type, TREE_TYPE (ctor)) | |
4913 | && !offset) | |
9d60be38 | 4914 | return canonicalize_constructor_val (unshare_expr (ctor), from_decl); |
cfef45c8 RG |
4915 | |
4916 | /* We are at the end of walk, see if we can view convert the | |
4917 | result. */ | |
4918 | if (!AGGREGATE_TYPE_P (TREE_TYPE (ctor)) && !offset | |
4919 | /* VIEW_CONVERT_EXPR is defined only for matching sizes. */ | |
3d8208ce TP |
4920 | && !compare_tree_int (TYPE_SIZE (type), size) |
4921 | && !compare_tree_int (TYPE_SIZE (TREE_TYPE (ctor)), size)) | |
cfef45c8 | 4922 | { |
9d60be38 | 4923 | ret = canonicalize_constructor_val (unshare_expr (ctor), from_decl); |
cfef45c8 RG |
4924 | ret = fold_unary (VIEW_CONVERT_EXPR, type, ret); |
4925 | if (ret) | |
4926 | STRIP_NOPS (ret); | |
4927 | return ret; | |
4928 | } | |
b2505143 RB |
4929 | /* For constants and byte-aligned/sized reads try to go through |
4930 | native_encode/interpret. */ | |
4931 | if (CONSTANT_CLASS_P (ctor) | |
4932 | && BITS_PER_UNIT == 8 | |
4933 | && offset % BITS_PER_UNIT == 0 | |
4934 | && size % BITS_PER_UNIT == 0 | |
4935 | && size <= MAX_BITSIZE_MODE_ANY_MODE) | |
4936 | { | |
4937 | unsigned char buf[MAX_BITSIZE_MODE_ANY_MODE / BITS_PER_UNIT]; | |
4938 | if (native_encode_expr (ctor, buf, size / BITS_PER_UNIT, | |
4939 | offset / BITS_PER_UNIT) > 0) | |
4940 | return native_interpret_expr (type, buf, size / BITS_PER_UNIT); | |
4941 | } | |
cfef45c8 RG |
4942 | if (TREE_CODE (ctor) == CONSTRUCTOR) |
4943 | { | |
4944 | ||
eb8f1123 RG |
4945 | if (TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE |
4946 | || TREE_CODE (TREE_TYPE (ctor)) == VECTOR_TYPE) | |
c44c2088 JH |
4947 | return fold_array_ctor_reference (type, ctor, offset, size, |
4948 | from_decl); | |
cfef45c8 | 4949 | else |
c44c2088 JH |
4950 | return fold_nonarray_ctor_reference (type, ctor, offset, size, |
4951 | from_decl); | |
cfef45c8 RG |
4952 | } |
4953 | ||
4954 | return NULL_TREE; | |
4955 | } | |
4956 | ||
4957 | /* Return the tree representing the element referenced by T if T is an | |
4958 | ARRAY_REF or COMPONENT_REF into constant aggregates valuezing SSA | |
4959 | names using VALUEIZE. Return NULL_TREE otherwise. */ | |
4960 | ||
4961 | tree | |
4962 | fold_const_aggregate_ref_1 (tree t, tree (*valueize) (tree)) | |
4963 | { | |
4964 | tree ctor, idx, base; | |
4965 | HOST_WIDE_INT offset, size, max_size; | |
4966 | tree tem; | |
4967 | ||
f8a7df45 RG |
4968 | if (TREE_THIS_VOLATILE (t)) |
4969 | return NULL_TREE; | |
4970 | ||
cfef45c8 RG |
4971 | if (TREE_CODE_CLASS (TREE_CODE (t)) == tcc_declaration) |
4972 | return get_symbol_constant_value (t); | |
4973 | ||
4974 | tem = fold_read_from_constant_string (t); | |
4975 | if (tem) | |
4976 | return tem; | |
4977 | ||
4978 | switch (TREE_CODE (t)) | |
4979 | { | |
4980 | case ARRAY_REF: | |
4981 | case ARRAY_RANGE_REF: | |
4982 | /* Constant indexes are handled well by get_base_constructor. | |
4983 | Only special case variable offsets. | |
4984 | FIXME: This code can't handle nested references with variable indexes | |
4985 | (they will be handled only by iteration of ccp). Perhaps we can bring | |
4986 | get_ref_base_and_extent here and make it use a valueize callback. */ | |
4987 | if (TREE_CODE (TREE_OPERAND (t, 1)) == SSA_NAME | |
4988 | && valueize | |
4989 | && (idx = (*valueize) (TREE_OPERAND (t, 1))) | |
b48e22b2 | 4990 | && TREE_CODE (idx) == INTEGER_CST) |
cfef45c8 RG |
4991 | { |
4992 | tree low_bound, unit_size; | |
4993 | ||
4994 | /* If the resulting bit-offset is constant, track it. */ | |
4995 | if ((low_bound = array_ref_low_bound (t), | |
b48e22b2 | 4996 | TREE_CODE (low_bound) == INTEGER_CST) |
cfef45c8 | 4997 | && (unit_size = array_ref_element_size (t), |
807e902e | 4998 | tree_fits_uhwi_p (unit_size))) |
cfef45c8 | 4999 | { |
807e902e KZ |
5000 | offset_int woffset |
5001 | = wi::sext (wi::to_offset (idx) - wi::to_offset (low_bound), | |
5002 | TYPE_PRECISION (TREE_TYPE (idx))); | |
5003 | ||
5004 | if (wi::fits_shwi_p (woffset)) | |
5005 | { | |
5006 | offset = woffset.to_shwi (); | |
5007 | /* TODO: This code seems wrong, multiply then check | |
5008 | to see if it fits. */ | |
5009 | offset *= tree_to_uhwi (unit_size); | |
5010 | offset *= BITS_PER_UNIT; | |
5011 | ||
5012 | base = TREE_OPERAND (t, 0); | |
5013 | ctor = get_base_constructor (base, &offset, valueize); | |
5014 | /* Empty constructor. Always fold to 0. */ | |
5015 | if (ctor == error_mark_node) | |
5016 | return build_zero_cst (TREE_TYPE (t)); | |
5017 | /* Out of bound array access. Value is undefined, | |
5018 | but don't fold. */ | |
5019 | if (offset < 0) | |
5020 | return NULL_TREE; | |
5021 | /* We can not determine ctor. */ | |
5022 | if (!ctor) | |
5023 | return NULL_TREE; | |
5024 | return fold_ctor_reference (TREE_TYPE (t), ctor, offset, | |
5025 | tree_to_uhwi (unit_size) | |
5026 | * BITS_PER_UNIT, | |
5027 | base); | |
5028 | } | |
cfef45c8 RG |
5029 | } |
5030 | } | |
5031 | /* Fallthru. */ | |
5032 | ||
5033 | case COMPONENT_REF: | |
5034 | case BIT_FIELD_REF: | |
5035 | case TARGET_MEM_REF: | |
5036 | case MEM_REF: | |
5037 | base = get_ref_base_and_extent (t, &offset, &size, &max_size); | |
5038 | ctor = get_base_constructor (base, &offset, valueize); | |
5039 | ||
5040 | /* Empty constructor. Always fold to 0. */ | |
5041 | if (ctor == error_mark_node) | |
5042 | return build_zero_cst (TREE_TYPE (t)); | |
5043 | /* We do not know precise address. */ | |
5044 | if (max_size == -1 || max_size != size) | |
5045 | return NULL_TREE; | |
5046 | /* We can not determine ctor. */ | |
5047 | if (!ctor) | |
5048 | return NULL_TREE; | |
5049 | ||
5050 | /* Out of bound array access. Value is undefined, but don't fold. */ | |
5051 | if (offset < 0) | |
5052 | return NULL_TREE; | |
5053 | ||
c44c2088 JH |
5054 | return fold_ctor_reference (TREE_TYPE (t), ctor, offset, size, |
5055 | base); | |
cfef45c8 RG |
5056 | |
5057 | case REALPART_EXPR: | |
5058 | case IMAGPART_EXPR: | |
5059 | { | |
5060 | tree c = fold_const_aggregate_ref_1 (TREE_OPERAND (t, 0), valueize); | |
5061 | if (c && TREE_CODE (c) == COMPLEX_CST) | |
5062 | return fold_build1_loc (EXPR_LOCATION (t), | |
5063 | TREE_CODE (t), TREE_TYPE (t), c); | |
5064 | break; | |
5065 | } | |
5066 | ||
5067 | default: | |
5068 | break; | |
5069 | } | |
5070 | ||
5071 | return NULL_TREE; | |
5072 | } | |
5073 | ||
5074 | tree | |
5075 | fold_const_aggregate_ref (tree t) | |
5076 | { | |
5077 | return fold_const_aggregate_ref_1 (t, NULL); | |
5078 | } | |
06bc3ec7 | 5079 | |
85942f45 | 5080 | /* Lookup virtual method with index TOKEN in a virtual table V |
ec77d61f JH |
5081 | at OFFSET. |
5082 | Set CAN_REFER if non-NULL to false if method | |
5083 | is not referable or if the virtual table is ill-formed (such as rewriten | |
5084 | by non-C++ produced symbol). Otherwise just return NULL in that calse. */ | |
81fa35bd MJ |
5085 | |
5086 | tree | |
85942f45 JH |
5087 | gimple_get_virt_method_for_vtable (HOST_WIDE_INT token, |
5088 | tree v, | |
ec77d61f JH |
5089 | unsigned HOST_WIDE_INT offset, |
5090 | bool *can_refer) | |
81fa35bd | 5091 | { |
85942f45 JH |
5092 | tree vtable = v, init, fn; |
5093 | unsigned HOST_WIDE_INT size; | |
8c311b50 JH |
5094 | unsigned HOST_WIDE_INT elt_size, access_index; |
5095 | tree domain_type; | |
81fa35bd | 5096 | |
ec77d61f JH |
5097 | if (can_refer) |
5098 | *can_refer = true; | |
5099 | ||
9de2f554 | 5100 | /* First of all double check we have virtual table. */ |
81fa35bd | 5101 | if (TREE_CODE (v) != VAR_DECL |
2aa3da06 | 5102 | || !DECL_VIRTUAL_P (v)) |
ec77d61f JH |
5103 | { |
5104 | gcc_assert (in_lto_p); | |
5105 | /* Pass down that we lost track of the target. */ | |
5106 | if (can_refer) | |
5107 | *can_refer = false; | |
5108 | return NULL_TREE; | |
5109 | } | |
9de2f554 | 5110 | |
2aa3da06 JH |
5111 | init = ctor_for_folding (v); |
5112 | ||
9de2f554 | 5113 | /* The virtual tables should always be born with constructors |
2aa3da06 JH |
5114 | and we always should assume that they are avaialble for |
5115 | folding. At the moment we do not stream them in all cases, | |
5116 | but it should never happen that ctor seem unreachable. */ | |
5117 | gcc_assert (init); | |
5118 | if (init == error_mark_node) | |
5119 | { | |
5120 | gcc_assert (in_lto_p); | |
ec77d61f JH |
5121 | /* Pass down that we lost track of the target. */ |
5122 | if (can_refer) | |
5123 | *can_refer = false; | |
2aa3da06 JH |
5124 | return NULL_TREE; |
5125 | } | |
81fa35bd | 5126 | gcc_checking_assert (TREE_CODE (TREE_TYPE (v)) == ARRAY_TYPE); |
ae7e9ddd | 5127 | size = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (TREE_TYPE (v)))); |
85942f45 | 5128 | offset *= BITS_PER_UNIT; |
81fa35bd | 5129 | offset += token * size; |
9de2f554 | 5130 | |
8c311b50 JH |
5131 | /* Lookup the value in the constructor that is assumed to be array. |
5132 | This is equivalent to | |
5133 | fn = fold_ctor_reference (TREE_TYPE (TREE_TYPE (v)), init, | |
5134 | offset, size, NULL); | |
5135 | but in a constant time. We expect that frontend produced a simple | |
5136 | array without indexed initializers. */ | |
5137 | ||
5138 | gcc_checking_assert (TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE); | |
5139 | domain_type = TYPE_DOMAIN (TREE_TYPE (init)); | |
5140 | gcc_checking_assert (integer_zerop (TYPE_MIN_VALUE (domain_type))); | |
5141 | elt_size = tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (init)))); | |
5142 | ||
5143 | access_index = offset / BITS_PER_UNIT / elt_size; | |
5144 | gcc_checking_assert (offset % (elt_size * BITS_PER_UNIT) == 0); | |
5145 | ||
5146 | /* This code makes an assumption that there are no | |
5147 | indexed fileds produced by C++ FE, so we can directly index the array. */ | |
5148 | if (access_index < CONSTRUCTOR_NELTS (init)) | |
5149 | { | |
5150 | fn = CONSTRUCTOR_ELT (init, access_index)->value; | |
5151 | gcc_checking_assert (!CONSTRUCTOR_ELT (init, access_index)->index); | |
5152 | STRIP_NOPS (fn); | |
5153 | } | |
5154 | else | |
5155 | fn = NULL; | |
9de2f554 JH |
5156 | |
5157 | /* For type inconsistent program we may end up looking up virtual method | |
5158 | in virtual table that does not contain TOKEN entries. We may overrun | |
5159 | the virtual table and pick up a constant or RTTI info pointer. | |
5160 | In any case the call is undefined. */ | |
5161 | if (!fn | |
5162 | || (TREE_CODE (fn) != ADDR_EXPR && TREE_CODE (fn) != FDESC_EXPR) | |
5163 | || TREE_CODE (TREE_OPERAND (fn, 0)) != FUNCTION_DECL) | |
5164 | fn = builtin_decl_implicit (BUILT_IN_UNREACHABLE); | |
5165 | else | |
5166 | { | |
5167 | fn = TREE_OPERAND (fn, 0); | |
5168 | ||
5169 | /* When cgraph node is missing and function is not public, we cannot | |
5170 | devirtualize. This can happen in WHOPR when the actual method | |
5171 | ends up in other partition, because we found devirtualization | |
5172 | possibility too late. */ | |
5173 | if (!can_refer_decl_in_current_unit_p (fn, vtable)) | |
ec77d61f JH |
5174 | { |
5175 | if (can_refer) | |
5176 | { | |
5177 | *can_refer = false; | |
5178 | return fn; | |
5179 | } | |
5180 | return NULL_TREE; | |
5181 | } | |
9de2f554 | 5182 | } |
81fa35bd | 5183 | |
7501ca28 RG |
5184 | /* Make sure we create a cgraph node for functions we'll reference. |
5185 | They can be non-existent if the reference comes from an entry | |
5186 | of an external vtable for example. */ | |
d52f5295 | 5187 | cgraph_node::get_create (fn); |
7501ca28 | 5188 | |
81fa35bd MJ |
5189 | return fn; |
5190 | } | |
5191 | ||
85942f45 JH |
5192 | /* Return a declaration of a function which an OBJ_TYPE_REF references. TOKEN |
5193 | is integer form of OBJ_TYPE_REF_TOKEN of the reference expression. | |
5194 | KNOWN_BINFO carries the binfo describing the true type of | |
ec77d61f JH |
5195 | OBJ_TYPE_REF_OBJECT(REF). |
5196 | Set CAN_REFER if non-NULL to false if method | |
5197 | is not referable or if the virtual table is ill-formed (such as rewriten | |
5198 | by non-C++ produced symbol). Otherwise just return NULL in that calse. */ | |
85942f45 JH |
5199 | |
5200 | tree | |
ec77d61f JH |
5201 | gimple_get_virt_method_for_binfo (HOST_WIDE_INT token, tree known_binfo, |
5202 | bool *can_refer) | |
85942f45 JH |
5203 | { |
5204 | unsigned HOST_WIDE_INT offset; | |
5205 | tree v; | |
5206 | ||
5207 | v = BINFO_VTABLE (known_binfo); | |
5208 | /* If there is no virtual methods table, leave the OBJ_TYPE_REF alone. */ | |
5209 | if (!v) | |
5210 | return NULL_TREE; | |
5211 | ||
5212 | if (!vtable_pointer_value_to_vtable (v, &v, &offset)) | |
ec77d61f JH |
5213 | { |
5214 | if (can_refer) | |
5215 | *can_refer = false; | |
5216 | return NULL_TREE; | |
5217 | } | |
5218 | return gimple_get_virt_method_for_vtable (token, v, offset, can_refer); | |
85942f45 JH |
5219 | } |
5220 | ||
06bc3ec7 BS |
5221 | /* Return true iff VAL is a gimple expression that is known to be |
5222 | non-negative. Restricted to floating-point inputs. */ | |
5223 | ||
5224 | bool | |
5225 | gimple_val_nonnegative_real_p (tree val) | |
5226 | { | |
5227 | gimple def_stmt; | |
5228 | ||
5229 | gcc_assert (val && SCALAR_FLOAT_TYPE_P (TREE_TYPE (val))); | |
5230 | ||
5231 | /* Use existing logic for non-gimple trees. */ | |
5232 | if (tree_expr_nonnegative_p (val)) | |
5233 | return true; | |
5234 | ||
5235 | if (TREE_CODE (val) != SSA_NAME) | |
5236 | return false; | |
5237 | ||
5238 | /* Currently we look only at the immediately defining statement | |
5239 | to make this determination, since recursion on defining | |
5240 | statements of operands can lead to quadratic behavior in the | |
5241 | worst case. This is expected to catch almost all occurrences | |
5242 | in practice. It would be possible to implement limited-depth | |
5243 | recursion if important cases are lost. Alternatively, passes | |
5244 | that need this information (such as the pow/powi lowering code | |
5245 | in the cse_sincos pass) could be revised to provide it through | |
5246 | dataflow propagation. */ | |
5247 | ||
5248 | def_stmt = SSA_NAME_DEF_STMT (val); | |
5249 | ||
5250 | if (is_gimple_assign (def_stmt)) | |
5251 | { | |
5252 | tree op0, op1; | |
5253 | ||
5254 | /* See fold-const.c:tree_expr_nonnegative_p for additional | |
5255 | cases that could be handled with recursion. */ | |
5256 | ||
5257 | switch (gimple_assign_rhs_code (def_stmt)) | |
5258 | { | |
5259 | case ABS_EXPR: | |
5260 | /* Always true for floating-point operands. */ | |
5261 | return true; | |
5262 | ||
5263 | case MULT_EXPR: | |
5264 | /* True if the two operands are identical (since we are | |
5265 | restricted to floating-point inputs). */ | |
5266 | op0 = gimple_assign_rhs1 (def_stmt); | |
5267 | op1 = gimple_assign_rhs2 (def_stmt); | |
5268 | ||
5269 | if (op0 == op1 | |
5270 | || operand_equal_p (op0, op1, 0)) | |
5271 | return true; | |
5272 | ||
5273 | default: | |
5274 | return false; | |
5275 | } | |
5276 | } | |
5277 | else if (is_gimple_call (def_stmt)) | |
5278 | { | |
5279 | tree fndecl = gimple_call_fndecl (def_stmt); | |
5280 | if (fndecl | |
5281 | && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL) | |
5282 | { | |
5283 | tree arg1; | |
5284 | ||
5285 | switch (DECL_FUNCTION_CODE (fndecl)) | |
5286 | { | |
5287 | CASE_FLT_FN (BUILT_IN_ACOS): | |
5288 | CASE_FLT_FN (BUILT_IN_ACOSH): | |
5289 | CASE_FLT_FN (BUILT_IN_CABS): | |
5290 | CASE_FLT_FN (BUILT_IN_COSH): | |
5291 | CASE_FLT_FN (BUILT_IN_ERFC): | |
5292 | CASE_FLT_FN (BUILT_IN_EXP): | |
5293 | CASE_FLT_FN (BUILT_IN_EXP10): | |
5294 | CASE_FLT_FN (BUILT_IN_EXP2): | |
5295 | CASE_FLT_FN (BUILT_IN_FABS): | |
5296 | CASE_FLT_FN (BUILT_IN_FDIM): | |
5297 | CASE_FLT_FN (BUILT_IN_HYPOT): | |
5298 | CASE_FLT_FN (BUILT_IN_POW10): | |
5299 | return true; | |
5300 | ||
5301 | CASE_FLT_FN (BUILT_IN_SQRT): | |
5302 | /* sqrt(-0.0) is -0.0, and sqrt is not defined over other | |
5303 | nonnegative inputs. */ | |
5304 | if (!HONOR_SIGNED_ZEROS (TYPE_MODE (TREE_TYPE (val)))) | |
5305 | return true; | |
5306 | ||
5307 | break; | |
5308 | ||
5309 | CASE_FLT_FN (BUILT_IN_POWI): | |
5310 | /* True if the second argument is an even integer. */ | |
5311 | arg1 = gimple_call_arg (def_stmt, 1); | |
5312 | ||
5313 | if (TREE_CODE (arg1) == INTEGER_CST | |
5314 | && (TREE_INT_CST_LOW (arg1) & 1) == 0) | |
5315 | return true; | |
5316 | ||
5317 | break; | |
5318 | ||
5319 | CASE_FLT_FN (BUILT_IN_POW): | |
5320 | /* True if the second argument is an even integer-valued | |
5321 | real. */ | |
5322 | arg1 = gimple_call_arg (def_stmt, 1); | |
5323 | ||
5324 | if (TREE_CODE (arg1) == REAL_CST) | |
5325 | { | |
5326 | REAL_VALUE_TYPE c; | |
5327 | HOST_WIDE_INT n; | |
5328 | ||
5329 | c = TREE_REAL_CST (arg1); | |
5330 | n = real_to_integer (&c); | |
5331 | ||
5332 | if ((n & 1) == 0) | |
5333 | { | |
5334 | REAL_VALUE_TYPE cint; | |
807e902e | 5335 | real_from_integer (&cint, VOIDmode, n, SIGNED); |
06bc3ec7 BS |
5336 | if (real_identical (&c, &cint)) |
5337 | return true; | |
5338 | } | |
5339 | } | |
5340 | ||
5341 | break; | |
5342 | ||
5343 | default: | |
5344 | return false; | |
5345 | } | |
5346 | } | |
5347 | } | |
5348 | ||
5349 | return false; | |
5350 | } | |
b184c8f1 AM |
5351 | |
5352 | /* Given a pointer value OP0, return a simplified version of an | |
5353 | indirection through OP0, or NULL_TREE if no simplification is | |
5354 | possible. Note that the resulting type may be different from | |
5355 | the type pointed to in the sense that it is still compatible | |
5356 | from the langhooks point of view. */ | |
5357 | ||
5358 | tree | |
5359 | gimple_fold_indirect_ref (tree t) | |
5360 | { | |
5361 | tree ptype = TREE_TYPE (t), type = TREE_TYPE (ptype); | |
5362 | tree sub = t; | |
5363 | tree subtype; | |
5364 | ||
5365 | STRIP_NOPS (sub); | |
5366 | subtype = TREE_TYPE (sub); | |
5367 | if (!POINTER_TYPE_P (subtype)) | |
5368 | return NULL_TREE; | |
5369 | ||
5370 | if (TREE_CODE (sub) == ADDR_EXPR) | |
5371 | { | |
5372 | tree op = TREE_OPERAND (sub, 0); | |
5373 | tree optype = TREE_TYPE (op); | |
5374 | /* *&p => p */ | |
5375 | if (useless_type_conversion_p (type, optype)) | |
5376 | return op; | |
5377 | ||
5378 | /* *(foo *)&fooarray => fooarray[0] */ | |
5379 | if (TREE_CODE (optype) == ARRAY_TYPE | |
5380 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (optype))) == INTEGER_CST | |
5381 | && useless_type_conversion_p (type, TREE_TYPE (optype))) | |
5382 | { | |
5383 | tree type_domain = TYPE_DOMAIN (optype); | |
5384 | tree min_val = size_zero_node; | |
5385 | if (type_domain && TYPE_MIN_VALUE (type_domain)) | |
5386 | min_val = TYPE_MIN_VALUE (type_domain); | |
5387 | if (TREE_CODE (min_val) == INTEGER_CST) | |
5388 | return build4 (ARRAY_REF, type, op, min_val, NULL_TREE, NULL_TREE); | |
5389 | } | |
5390 | /* *(foo *)&complexfoo => __real__ complexfoo */ | |
5391 | else if (TREE_CODE (optype) == COMPLEX_TYPE | |
5392 | && useless_type_conversion_p (type, TREE_TYPE (optype))) | |
5393 | return fold_build1 (REALPART_EXPR, type, op); | |
5394 | /* *(foo *)&vectorfoo => BIT_FIELD_REF<vectorfoo,...> */ | |
5395 | else if (TREE_CODE (optype) == VECTOR_TYPE | |
5396 | && useless_type_conversion_p (type, TREE_TYPE (optype))) | |
5397 | { | |
5398 | tree part_width = TYPE_SIZE (type); | |
5399 | tree index = bitsize_int (0); | |
5400 | return fold_build3 (BIT_FIELD_REF, type, op, part_width, index); | |
5401 | } | |
5402 | } | |
5403 | ||
5404 | /* *(p + CST) -> ... */ | |
5405 | if (TREE_CODE (sub) == POINTER_PLUS_EXPR | |
5406 | && TREE_CODE (TREE_OPERAND (sub, 1)) == INTEGER_CST) | |
5407 | { | |
5408 | tree addr = TREE_OPERAND (sub, 0); | |
5409 | tree off = TREE_OPERAND (sub, 1); | |
5410 | tree addrtype; | |
5411 | ||
5412 | STRIP_NOPS (addr); | |
5413 | addrtype = TREE_TYPE (addr); | |
5414 | ||
5415 | /* ((foo*)&vectorfoo)[1] -> BIT_FIELD_REF<vectorfoo,...> */ | |
5416 | if (TREE_CODE (addr) == ADDR_EXPR | |
5417 | && TREE_CODE (TREE_TYPE (addrtype)) == VECTOR_TYPE | |
5418 | && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (addrtype))) | |
cc269bb6 | 5419 | && tree_fits_uhwi_p (off)) |
b184c8f1 | 5420 | { |
ae7e9ddd | 5421 | unsigned HOST_WIDE_INT offset = tree_to_uhwi (off); |
b184c8f1 AM |
5422 | tree part_width = TYPE_SIZE (type); |
5423 | unsigned HOST_WIDE_INT part_widthi | |
9439e9a1 | 5424 | = tree_to_shwi (part_width) / BITS_PER_UNIT; |
b184c8f1 AM |
5425 | unsigned HOST_WIDE_INT indexi = offset * BITS_PER_UNIT; |
5426 | tree index = bitsize_int (indexi); | |
5427 | if (offset / part_widthi | |
e934916c | 5428 | < TYPE_VECTOR_SUBPARTS (TREE_TYPE (addrtype))) |
b184c8f1 AM |
5429 | return fold_build3 (BIT_FIELD_REF, type, TREE_OPERAND (addr, 0), |
5430 | part_width, index); | |
5431 | } | |
5432 | ||
5433 | /* ((foo*)&complexfoo)[1] -> __imag__ complexfoo */ | |
5434 | if (TREE_CODE (addr) == ADDR_EXPR | |
5435 | && TREE_CODE (TREE_TYPE (addrtype)) == COMPLEX_TYPE | |
5436 | && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (addrtype)))) | |
5437 | { | |
5438 | tree size = TYPE_SIZE_UNIT (type); | |
5439 | if (tree_int_cst_equal (size, off)) | |
5440 | return fold_build1 (IMAGPART_EXPR, type, TREE_OPERAND (addr, 0)); | |
5441 | } | |
5442 | ||
5443 | /* *(p + CST) -> MEM_REF <p, CST>. */ | |
5444 | if (TREE_CODE (addr) != ADDR_EXPR | |
5445 | || DECL_P (TREE_OPERAND (addr, 0))) | |
5446 | return fold_build2 (MEM_REF, type, | |
5447 | addr, | |
807e902e | 5448 | wide_int_to_tree (ptype, off)); |
b184c8f1 AM |
5449 | } |
5450 | ||
5451 | /* *(foo *)fooarrptr => (*fooarrptr)[0] */ | |
5452 | if (TREE_CODE (TREE_TYPE (subtype)) == ARRAY_TYPE | |
5453 | && TREE_CODE (TYPE_SIZE (TREE_TYPE (TREE_TYPE (subtype)))) == INTEGER_CST | |
5454 | && useless_type_conversion_p (type, TREE_TYPE (TREE_TYPE (subtype)))) | |
5455 | { | |
5456 | tree type_domain; | |
5457 | tree min_val = size_zero_node; | |
5458 | tree osub = sub; | |
5459 | sub = gimple_fold_indirect_ref (sub); | |
5460 | if (! sub) | |
5461 | sub = build1 (INDIRECT_REF, TREE_TYPE (subtype), osub); | |
5462 | type_domain = TYPE_DOMAIN (TREE_TYPE (sub)); | |
5463 | if (type_domain && TYPE_MIN_VALUE (type_domain)) | |
5464 | min_val = TYPE_MIN_VALUE (type_domain); | |
5465 | if (TREE_CODE (min_val) == INTEGER_CST) | |
5466 | return build4 (ARRAY_REF, type, sub, min_val, NULL_TREE, NULL_TREE); | |
5467 | } | |
5468 | ||
5469 | return NULL_TREE; | |
5470 | } | |
19e51b40 JJ |
5471 | |
5472 | /* Return true if CODE is an operation that when operating on signed | |
5473 | integer types involves undefined behavior on overflow and the | |
5474 | operation can be expressed with unsigned arithmetic. */ | |
5475 | ||
5476 | bool | |
5477 | arith_code_with_undefined_signed_overflow (tree_code code) | |
5478 | { | |
5479 | switch (code) | |
5480 | { | |
5481 | case PLUS_EXPR: | |
5482 | case MINUS_EXPR: | |
5483 | case MULT_EXPR: | |
5484 | case NEGATE_EXPR: | |
5485 | case POINTER_PLUS_EXPR: | |
5486 | return true; | |
5487 | default: | |
5488 | return false; | |
5489 | } | |
5490 | } | |
5491 | ||
5492 | /* Rewrite STMT, an assignment with a signed integer or pointer arithmetic | |
5493 | operation that can be transformed to unsigned arithmetic by converting | |
5494 | its operand, carrying out the operation in the corresponding unsigned | |
5495 | type and converting the result back to the original type. | |
5496 | ||
5497 | Returns a sequence of statements that replace STMT and also contain | |
5498 | a modified form of STMT itself. */ | |
5499 | ||
5500 | gimple_seq | |
5501 | rewrite_to_defined_overflow (gimple stmt) | |
5502 | { | |
5503 | if (dump_file && (dump_flags & TDF_DETAILS)) | |
5504 | { | |
5505 | fprintf (dump_file, "rewriting stmt with undefined signed " | |
5506 | "overflow "); | |
5507 | print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
5508 | } | |
5509 | ||
5510 | tree lhs = gimple_assign_lhs (stmt); | |
5511 | tree type = unsigned_type_for (TREE_TYPE (lhs)); | |
5512 | gimple_seq stmts = NULL; | |
5513 | for (unsigned i = 1; i < gimple_num_ops (stmt); ++i) | |
5514 | { | |
5515 | gimple_seq stmts2 = NULL; | |
5516 | gimple_set_op (stmt, i, | |
5517 | force_gimple_operand (fold_convert (type, | |
5518 | gimple_op (stmt, i)), | |
5519 | &stmts2, true, NULL_TREE)); | |
5520 | gimple_seq_add_seq (&stmts, stmts2); | |
5521 | } | |
5522 | gimple_assign_set_lhs (stmt, make_ssa_name (type, stmt)); | |
5523 | if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR) | |
5524 | gimple_assign_set_rhs_code (stmt, PLUS_EXPR); | |
5525 | gimple_seq_add_stmt (&stmts, stmt); | |
5526 | gimple cvt = gimple_build_assign_with_ops | |
5527 | (NOP_EXPR, lhs, gimple_assign_lhs (stmt), NULL_TREE); | |
5528 | gimple_seq_add_stmt (&stmts, cvt); | |
5529 | ||
5530 | return stmts; | |
5531 | } | |
d4f5cd5e | 5532 | |
3d2cf79f RB |
5533 | |
5534 | /* Build the expression CODE OP0 of type TYPE with location LOC, | |
5535 | simplifying it first if possible using VALUEIZE if not NULL. | |
5536 | OP0 is expected to be valueized already. Returns the built | |
5537 | expression value and appends statements possibly defining it | |
5538 | to SEQ. */ | |
5539 | ||
5540 | tree | |
5541 | gimple_build (gimple_seq *seq, location_t loc, | |
5542 | enum tree_code code, tree type, tree op0, | |
5543 | tree (*valueize)(tree)) | |
5544 | { | |
5545 | tree res = gimple_simplify (code, type, op0, seq, valueize); | |
5546 | if (!res) | |
5547 | { | |
5548 | if (gimple_in_ssa_p (cfun)) | |
5549 | res = make_ssa_name (type, NULL); | |
5550 | else | |
5551 | res = create_tmp_reg (type, NULL); | |
5552 | gimple stmt; | |
5553 | if (code == REALPART_EXPR | |
5554 | || code == IMAGPART_EXPR | |
5555 | || code == VIEW_CONVERT_EXPR) | |
5556 | stmt = gimple_build_assign_with_ops (code, res, | |
5557 | build1 (code, type, | |
5558 | op0), NULL_TREE); | |
5559 | else | |
5560 | stmt = gimple_build_assign_with_ops (code, res, op0, NULL_TREE); | |
5561 | gimple_set_location (stmt, loc); | |
5562 | gimple_seq_add_stmt_without_update (seq, stmt); | |
5563 | } | |
5564 | return res; | |
5565 | } | |
5566 | ||
5567 | /* Build the expression OP0 CODE OP1 of type TYPE with location LOC, | |
5568 | simplifying it first if possible using VALUEIZE if not NULL. | |
5569 | OP0 and OP1 are expected to be valueized already. Returns the built | |
5570 | expression value and appends statements possibly defining it | |
5571 | to SEQ. */ | |
5572 | ||
5573 | tree | |
5574 | gimple_build (gimple_seq *seq, location_t loc, | |
5575 | enum tree_code code, tree type, tree op0, tree op1, | |
5576 | tree (*valueize)(tree)) | |
5577 | { | |
5578 | tree res = gimple_simplify (code, type, op0, op1, seq, valueize); | |
5579 | if (!res) | |
5580 | { | |
5581 | if (gimple_in_ssa_p (cfun)) | |
5582 | res = make_ssa_name (type, NULL); | |
5583 | else | |
5584 | res = create_tmp_reg (type, NULL); | |
5585 | gimple stmt = gimple_build_assign_with_ops (code, res, op0, op1); | |
5586 | gimple_set_location (stmt, loc); | |
5587 | gimple_seq_add_stmt_without_update (seq, stmt); | |
5588 | } | |
5589 | return res; | |
5590 | } | |
5591 | ||
5592 | /* Build the expression (CODE OP0 OP1 OP2) of type TYPE with location LOC, | |
5593 | simplifying it first if possible using VALUEIZE if not NULL. | |
5594 | OP0, OP1 and OP2 are expected to be valueized already. Returns the built | |
5595 | expression value and appends statements possibly defining it | |
5596 | to SEQ. */ | |
5597 | ||
5598 | tree | |
5599 | gimple_build (gimple_seq *seq, location_t loc, | |
5600 | enum tree_code code, tree type, tree op0, tree op1, tree op2, | |
5601 | tree (*valueize)(tree)) | |
5602 | { | |
5603 | tree res = gimple_simplify (code, type, op0, op1, op2, | |
5604 | seq, valueize); | |
5605 | if (!res) | |
5606 | { | |
5607 | if (gimple_in_ssa_p (cfun)) | |
5608 | res = make_ssa_name (type, NULL); | |
5609 | else | |
5610 | res = create_tmp_reg (type, NULL); | |
5611 | gimple stmt; | |
5612 | if (code == BIT_FIELD_REF) | |
5613 | stmt = gimple_build_assign_with_ops (code, res, | |
5614 | build3 (BIT_FIELD_REF, type, | |
5615 | op0, op1, op2), | |
5616 | NULL_TREE); | |
5617 | else | |
5618 | stmt = gimple_build_assign_with_ops (code, res, op0, op1, op2); | |
5619 | gimple_set_location (stmt, loc); | |
5620 | gimple_seq_add_stmt_without_update (seq, stmt); | |
5621 | } | |
5622 | return res; | |
5623 | } | |
5624 | ||
5625 | /* Build the call FN (ARG0) with a result of type TYPE | |
5626 | (or no result if TYPE is void) with location LOC, | |
5627 | simplifying it first if possible using VALUEIZE if not NULL. | |
5628 | ARG0 is expected to be valueized already. Returns the built | |
5629 | expression value (or NULL_TREE if TYPE is void) and appends | |
5630 | statements possibly defining it to SEQ. */ | |
5631 | ||
5632 | tree | |
5633 | gimple_build (gimple_seq *seq, location_t loc, | |
5634 | enum built_in_function fn, tree type, tree arg0, | |
5635 | tree (*valueize)(tree)) | |
5636 | { | |
5637 | tree res = gimple_simplify (fn, type, arg0, seq, valueize); | |
5638 | if (!res) | |
5639 | { | |
5640 | tree decl = builtin_decl_implicit (fn); | |
5641 | gimple stmt = gimple_build_call (decl, 1, arg0); | |
5642 | if (!VOID_TYPE_P (type)) | |
5643 | { | |
5644 | if (gimple_in_ssa_p (cfun)) | |
5645 | res = make_ssa_name (type, NULL); | |
5646 | else | |
5647 | res = create_tmp_reg (type, NULL); | |
5648 | gimple_call_set_lhs (stmt, res); | |
5649 | } | |
5650 | gimple_set_location (stmt, loc); | |
5651 | gimple_seq_add_stmt_without_update (seq, stmt); | |
5652 | } | |
5653 | return res; | |
5654 | } | |
5655 | ||
5656 | /* Build the call FN (ARG0, ARG1) with a result of type TYPE | |
5657 | (or no result if TYPE is void) with location LOC, | |
5658 | simplifying it first if possible using VALUEIZE if not NULL. | |
5659 | ARG0 is expected to be valueized already. Returns the built | |
5660 | expression value (or NULL_TREE if TYPE is void) and appends | |
5661 | statements possibly defining it to SEQ. */ | |
5662 | ||
5663 | tree | |
5664 | gimple_build (gimple_seq *seq, location_t loc, | |
5665 | enum built_in_function fn, tree type, tree arg0, tree arg1, | |
5666 | tree (*valueize)(tree)) | |
5667 | { | |
5668 | tree res = gimple_simplify (fn, type, arg0, arg1, seq, valueize); | |
5669 | if (!res) | |
5670 | { | |
5671 | tree decl = builtin_decl_implicit (fn); | |
5672 | gimple stmt = gimple_build_call (decl, 2, arg0, arg1); | |
5673 | if (!VOID_TYPE_P (type)) | |
5674 | { | |
5675 | if (gimple_in_ssa_p (cfun)) | |
5676 | res = make_ssa_name (type, NULL); | |
5677 | else | |
5678 | res = create_tmp_reg (type, NULL); | |
5679 | gimple_call_set_lhs (stmt, res); | |
5680 | } | |
5681 | gimple_set_location (stmt, loc); | |
5682 | gimple_seq_add_stmt_without_update (seq, stmt); | |
5683 | } | |
5684 | return res; | |
5685 | } | |
5686 | ||
5687 | /* Build the call FN (ARG0, ARG1, ARG2) with a result of type TYPE | |
5688 | (or no result if TYPE is void) with location LOC, | |
5689 | simplifying it first if possible using VALUEIZE if not NULL. | |
5690 | ARG0 is expected to be valueized already. Returns the built | |
5691 | expression value (or NULL_TREE if TYPE is void) and appends | |
5692 | statements possibly defining it to SEQ. */ | |
5693 | ||
5694 | tree | |
5695 | gimple_build (gimple_seq *seq, location_t loc, | |
5696 | enum built_in_function fn, tree type, | |
5697 | tree arg0, tree arg1, tree arg2, | |
5698 | tree (*valueize)(tree)) | |
5699 | { | |
5700 | tree res = gimple_simplify (fn, type, arg0, arg1, arg2, seq, valueize); | |
5701 | if (!res) | |
5702 | { | |
5703 | tree decl = builtin_decl_implicit (fn); | |
5704 | gimple stmt = gimple_build_call (decl, 3, arg0, arg1, arg2); | |
5705 | if (!VOID_TYPE_P (type)) | |
5706 | { | |
5707 | if (gimple_in_ssa_p (cfun)) | |
5708 | res = make_ssa_name (type, NULL); | |
5709 | else | |
5710 | res = create_tmp_reg (type, NULL); | |
5711 | gimple_call_set_lhs (stmt, res); | |
5712 | } | |
5713 | gimple_set_location (stmt, loc); | |
5714 | gimple_seq_add_stmt_without_update (seq, stmt); | |
5715 | } | |
5716 | return res; | |
5717 | } | |
5718 | ||
5719 | /* Build the conversion (TYPE) OP with a result of type TYPE | |
5720 | with location LOC if such conversion is neccesary in GIMPLE, | |
5721 | simplifying it first. | |
5722 | Returns the built expression value and appends | |
5723 | statements possibly defining it to SEQ. */ | |
d4f5cd5e RB |
5724 | |
5725 | tree | |
5726 | gimple_convert (gimple_seq *seq, location_t loc, tree type, tree op) | |
5727 | { | |
5728 | if (useless_type_conversion_p (type, TREE_TYPE (op))) | |
5729 | return op; | |
3d2cf79f | 5730 | return gimple_build (seq, loc, NOP_EXPR, type, op); |
d4f5cd5e | 5731 | } |