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291d763b | 1 | /* Forward propagation of expressions for single use variables. |
711789cc | 2 | Copyright (C) 2004-2013 Free Software Foundation, Inc. |
4ee9c684 | 3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8c4c00c1 | 8 | the Free Software Foundation; either version 3, or (at your option) |
4ee9c684 | 9 | any later version. |
10 | ||
11 | GCC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
4ee9c684 | 19 | |
20 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "coretypes.h" | |
23 | #include "tm.h" | |
4ee9c684 | 24 | #include "tree.h" |
4ee9c684 | 25 | #include "tm_p.h" |
26 | #include "basic-block.h" | |
e5b1e080 | 27 | #include "gimple-pretty-print.h" |
073c1fd5 | 28 | #include "gimple.h" |
a8783bee | 29 | #include "gimplify.h" |
dcf1a1ec | 30 | #include "gimple-iterator.h" |
e795d6e1 | 31 | #include "gimplify-me.h" |
073c1fd5 | 32 | #include "gimple-ssa.h" |
33 | #include "tree-cfg.h" | |
34 | #include "tree-phinodes.h" | |
35 | #include "ssa-iterators.h" | |
36 | #include "tree-ssanames.h" | |
37 | #include "tree-dfa.h" | |
4ee9c684 | 38 | #include "tree-pass.h" |
291d763b | 39 | #include "langhooks.h" |
5adc1066 | 40 | #include "flags.h" |
27f931ff | 41 | #include "expr.h" |
6b42039a | 42 | #include "cfgloop.h" |
d1938a4b | 43 | #include "optabs.h" |
58bf5219 | 44 | #include "tree-ssa-propagate.h" |
424a4a92 | 45 | #include "tree-ssa-dom.h" |
4ee9c684 | 46 | |
291d763b | 47 | /* This pass propagates the RHS of assignment statements into use |
48 | sites of the LHS of the assignment. It's basically a specialized | |
8f628ee8 | 49 | form of tree combination. It is hoped all of this can disappear |
50 | when we have a generalized tree combiner. | |
4ee9c684 | 51 | |
291d763b | 52 | One class of common cases we handle is forward propagating a single use |
48e1416a | 53 | variable into a COND_EXPR. |
4ee9c684 | 54 | |
55 | bb0: | |
56 | x = a COND b; | |
57 | if (x) goto ... else goto ... | |
58 | ||
59 | Will be transformed into: | |
60 | ||
61 | bb0: | |
62 | if (a COND b) goto ... else goto ... | |
48e1416a | 63 | |
4ee9c684 | 64 | Similarly for the tests (x == 0), (x != 0), (x == 1) and (x != 1). |
65 | ||
66 | Or (assuming c1 and c2 are constants): | |
67 | ||
68 | bb0: | |
48e1416a | 69 | x = a + c1; |
4ee9c684 | 70 | if (x EQ/NEQ c2) goto ... else goto ... |
71 | ||
72 | Will be transformed into: | |
73 | ||
74 | bb0: | |
75 | if (a EQ/NEQ (c2 - c1)) goto ... else goto ... | |
76 | ||
77 | Similarly for x = a - c1. | |
48e1416a | 78 | |
4ee9c684 | 79 | Or |
80 | ||
81 | bb0: | |
82 | x = !a | |
83 | if (x) goto ... else goto ... | |
84 | ||
85 | Will be transformed into: | |
86 | ||
87 | bb0: | |
88 | if (a == 0) goto ... else goto ... | |
89 | ||
90 | Similarly for the tests (x == 0), (x != 0), (x == 1) and (x != 1). | |
91 | For these cases, we propagate A into all, possibly more than one, | |
92 | COND_EXPRs that use X. | |
93 | ||
f5c8cff5 | 94 | Or |
95 | ||
96 | bb0: | |
97 | x = (typecast) a | |
98 | if (x) goto ... else goto ... | |
99 | ||
100 | Will be transformed into: | |
101 | ||
102 | bb0: | |
103 | if (a != 0) goto ... else goto ... | |
104 | ||
105 | (Assuming a is an integral type and x is a boolean or x is an | |
106 | integral and a is a boolean.) | |
107 | ||
108 | Similarly for the tests (x == 0), (x != 0), (x == 1) and (x != 1). | |
109 | For these cases, we propagate A into all, possibly more than one, | |
110 | COND_EXPRs that use X. | |
111 | ||
4ee9c684 | 112 | In addition to eliminating the variable and the statement which assigns |
113 | a value to the variable, we may be able to later thread the jump without | |
e6dfde59 | 114 | adding insane complexity in the dominator optimizer. |
4ee9c684 | 115 | |
f5c8cff5 | 116 | Also note these transformations can cascade. We handle this by having |
117 | a worklist of COND_EXPR statements to examine. As we make a change to | |
118 | a statement, we put it back on the worklist to examine on the next | |
119 | iteration of the main loop. | |
120 | ||
291d763b | 121 | A second class of propagation opportunities arises for ADDR_EXPR |
122 | nodes. | |
123 | ||
124 | ptr = &x->y->z; | |
125 | res = *ptr; | |
126 | ||
127 | Will get turned into | |
128 | ||
129 | res = x->y->z; | |
130 | ||
50f39ec6 | 131 | Or |
132 | ptr = (type1*)&type2var; | |
133 | res = *ptr | |
134 | ||
135 | Will get turned into (if type1 and type2 are the same size | |
136 | and neither have volatile on them): | |
137 | res = VIEW_CONVERT_EXPR<type1>(type2var) | |
138 | ||
291d763b | 139 | Or |
140 | ||
141 | ptr = &x[0]; | |
142 | ptr2 = ptr + <constant>; | |
143 | ||
144 | Will get turned into | |
145 | ||
146 | ptr2 = &x[constant/elementsize]; | |
147 | ||
148 | Or | |
149 | ||
150 | ptr = &x[0]; | |
151 | offset = index * element_size; | |
152 | offset_p = (pointer) offset; | |
153 | ptr2 = ptr + offset_p | |
154 | ||
155 | Will get turned into: | |
156 | ||
157 | ptr2 = &x[index]; | |
158 | ||
1c4607fd | 159 | Or |
160 | ssa = (int) decl | |
161 | res = ssa & 1 | |
162 | ||
163 | Provided that decl has known alignment >= 2, will get turned into | |
164 | ||
165 | res = 0 | |
166 | ||
8f628ee8 | 167 | We also propagate casts into SWITCH_EXPR and COND_EXPR conditions to |
168 | allow us to remove the cast and {NOT_EXPR,NEG_EXPR} into a subsequent | |
169 | {NOT_EXPR,NEG_EXPR}. | |
291d763b | 170 | |
4ee9c684 | 171 | This will (of course) be extended as other needs arise. */ |
172 | ||
bfb89138 | 173 | static bool forward_propagate_addr_expr (tree, tree, bool); |
148aa112 | 174 | |
b59e1c90 | 175 | /* Set to true if we delete dead edges during the optimization. */ |
148aa112 | 176 | static bool cfg_changed; |
177 | ||
75a70cf9 | 178 | static tree rhs_to_tree (tree type, gimple stmt); |
148aa112 | 179 | |
83a20baf | 180 | /* Get the next statement we can propagate NAME's value into skipping |
5adc1066 | 181 | trivial copies. Returns the statement that is suitable as a |
182 | propagation destination or NULL_TREE if there is no such one. | |
183 | This only returns destinations in a single-use chain. FINAL_NAME_P | |
184 | if non-NULL is written to the ssa name that represents the use. */ | |
a3451973 | 185 | |
75a70cf9 | 186 | static gimple |
5adc1066 | 187 | get_prop_dest_stmt (tree name, tree *final_name_p) |
a3451973 | 188 | { |
5adc1066 | 189 | use_operand_p use; |
75a70cf9 | 190 | gimple use_stmt; |
a3451973 | 191 | |
5adc1066 | 192 | do { |
193 | /* If name has multiple uses, bail out. */ | |
194 | if (!single_imm_use (name, &use, &use_stmt)) | |
75a70cf9 | 195 | return NULL; |
a3451973 | 196 | |
5adc1066 | 197 | /* If this is not a trivial copy, we found it. */ |
8f0b877f | 198 | if (!gimple_assign_ssa_name_copy_p (use_stmt) |
75a70cf9 | 199 | || gimple_assign_rhs1 (use_stmt) != name) |
5adc1066 | 200 | break; |
201 | ||
202 | /* Continue searching uses of the copy destination. */ | |
75a70cf9 | 203 | name = gimple_assign_lhs (use_stmt); |
5adc1066 | 204 | } while (1); |
205 | ||
206 | if (final_name_p) | |
207 | *final_name_p = name; | |
208 | ||
209 | return use_stmt; | |
a3451973 | 210 | } |
211 | ||
5adc1066 | 212 | /* Get the statement we can propagate from into NAME skipping |
213 | trivial copies. Returns the statement which defines the | |
214 | propagation source or NULL_TREE if there is no such one. | |
215 | If SINGLE_USE_ONLY is set considers only sources which have | |
216 | a single use chain up to NAME. If SINGLE_USE_P is non-null, | |
217 | it is set to whether the chain to NAME is a single use chain | |
218 | or not. SINGLE_USE_P is not written to if SINGLE_USE_ONLY is set. */ | |
4ee9c684 | 219 | |
75a70cf9 | 220 | static gimple |
5adc1066 | 221 | get_prop_source_stmt (tree name, bool single_use_only, bool *single_use_p) |
f5c8cff5 | 222 | { |
5adc1066 | 223 | bool single_use = true; |
224 | ||
225 | do { | |
75a70cf9 | 226 | gimple def_stmt = SSA_NAME_DEF_STMT (name); |
5adc1066 | 227 | |
228 | if (!has_single_use (name)) | |
229 | { | |
230 | single_use = false; | |
231 | if (single_use_only) | |
75a70cf9 | 232 | return NULL; |
5adc1066 | 233 | } |
234 | ||
235 | /* If name is defined by a PHI node or is the default def, bail out. */ | |
8f0b877f | 236 | if (!is_gimple_assign (def_stmt)) |
75a70cf9 | 237 | return NULL; |
5adc1066 | 238 | |
ab31ca23 | 239 | /* If def_stmt is a simple copy, continue looking. */ |
240 | if (gimple_assign_rhs_code (def_stmt) == SSA_NAME) | |
241 | name = gimple_assign_rhs1 (def_stmt); | |
242 | else | |
5adc1066 | 243 | { |
244 | if (!single_use_only && single_use_p) | |
245 | *single_use_p = single_use; | |
246 | ||
ab31ca23 | 247 | return def_stmt; |
5adc1066 | 248 | } |
5adc1066 | 249 | } while (1); |
250 | } | |
e6dfde59 | 251 | |
5adc1066 | 252 | /* Checks if the destination ssa name in DEF_STMT can be used as |
253 | propagation source. Returns true if so, otherwise false. */ | |
e6dfde59 | 254 | |
5adc1066 | 255 | static bool |
75a70cf9 | 256 | can_propagate_from (gimple def_stmt) |
5adc1066 | 257 | { |
75a70cf9 | 258 | gcc_assert (is_gimple_assign (def_stmt)); |
8f0b877f | 259 | |
484b827b | 260 | /* If the rhs has side-effects we cannot propagate from it. */ |
75a70cf9 | 261 | if (gimple_has_volatile_ops (def_stmt)) |
484b827b | 262 | return false; |
263 | ||
264 | /* If the rhs is a load we cannot propagate from it. */ | |
75a70cf9 | 265 | if (TREE_CODE_CLASS (gimple_assign_rhs_code (def_stmt)) == tcc_reference |
266 | || TREE_CODE_CLASS (gimple_assign_rhs_code (def_stmt)) == tcc_declaration) | |
484b827b | 267 | return false; |
268 | ||
b9e98b8a | 269 | /* Constants can be always propagated. */ |
8f0b877f | 270 | if (gimple_assign_single_p (def_stmt) |
271 | && is_gimple_min_invariant (gimple_assign_rhs1 (def_stmt))) | |
b9e98b8a | 272 | return true; |
273 | ||
75a70cf9 | 274 | /* We cannot propagate ssa names that occur in abnormal phi nodes. */ |
32cdcc42 | 275 | if (stmt_references_abnormal_ssa_name (def_stmt)) |
276 | return false; | |
4ee9c684 | 277 | |
5adc1066 | 278 | /* If the definition is a conversion of a pointer to a function type, |
75a70cf9 | 279 | then we can not apply optimizations as some targets require |
280 | function pointers to be canonicalized and in this case this | |
281 | optimization could eliminate a necessary canonicalization. */ | |
8f0b877f | 282 | if (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (def_stmt))) |
75a70cf9 | 283 | { |
284 | tree rhs = gimple_assign_rhs1 (def_stmt); | |
285 | if (POINTER_TYPE_P (TREE_TYPE (rhs)) | |
286 | && TREE_CODE (TREE_TYPE (TREE_TYPE (rhs))) == FUNCTION_TYPE) | |
287 | return false; | |
288 | } | |
8f0b877f | 289 | |
5adc1066 | 290 | return true; |
e6dfde59 | 291 | } |
292 | ||
ff0739e0 | 293 | /* Remove a chain of dead statements starting at the definition of |
294 | NAME. The chain is linked via the first operand of the defining statements. | |
5d2361b0 | 295 | If NAME was replaced in its only use then this function can be used |
ff0739e0 | 296 | to clean up dead stmts. The function handles already released SSA |
297 | names gracefully. | |
298 | Returns true if cleanup-cfg has to run. */ | |
8f628ee8 | 299 | |
5adc1066 | 300 | static bool |
5d2361b0 | 301 | remove_prop_source_from_use (tree name) |
5adc1066 | 302 | { |
75a70cf9 | 303 | gimple_stmt_iterator gsi; |
304 | gimple stmt; | |
5d2361b0 | 305 | bool cfg_changed = false; |
8f628ee8 | 306 | |
5adc1066 | 307 | do { |
5d2361b0 | 308 | basic_block bb; |
309 | ||
ff0739e0 | 310 | if (SSA_NAME_IN_FREE_LIST (name) |
311 | || SSA_NAME_IS_DEFAULT_DEF (name) | |
312 | || !has_zero_uses (name)) | |
5d2361b0 | 313 | return cfg_changed; |
8f628ee8 | 314 | |
5adc1066 | 315 | stmt = SSA_NAME_DEF_STMT (name); |
ff0739e0 | 316 | if (gimple_code (stmt) == GIMPLE_PHI |
317 | || gimple_has_side_effects (stmt)) | |
6f9714b3 | 318 | return cfg_changed; |
ff0739e0 | 319 | |
320 | bb = gimple_bb (stmt); | |
6f9714b3 | 321 | gsi = gsi_for_stmt (stmt); |
ff0739e0 | 322 | unlink_stmt_vdef (stmt); |
13ff78a4 | 323 | if (gsi_remove (&gsi, true)) |
324 | cfg_changed |= gimple_purge_dead_eh_edges (bb); | |
ff0739e0 | 325 | release_defs (stmt); |
8f628ee8 | 326 | |
ff0739e0 | 327 | name = is_gimple_assign (stmt) ? gimple_assign_rhs1 (stmt) : NULL_TREE; |
75a70cf9 | 328 | } while (name && TREE_CODE (name) == SSA_NAME); |
8f628ee8 | 329 | |
5d2361b0 | 330 | return cfg_changed; |
5adc1066 | 331 | } |
8f628ee8 | 332 | |
75a70cf9 | 333 | /* Return the rhs of a gimple_assign STMT in a form of a single tree, |
334 | converted to type TYPE. | |
48e1416a | 335 | |
75a70cf9 | 336 | This should disappear, but is needed so we can combine expressions and use |
337 | the fold() interfaces. Long term, we need to develop folding and combine | |
338 | routines that deal with gimple exclusively . */ | |
339 | ||
340 | static tree | |
341 | rhs_to_tree (tree type, gimple stmt) | |
342 | { | |
389dd41b | 343 | location_t loc = gimple_location (stmt); |
75a70cf9 | 344 | enum tree_code code = gimple_assign_rhs_code (stmt); |
57c45d70 | 345 | if (get_gimple_rhs_class (code) == GIMPLE_TERNARY_RHS) |
346 | return fold_build3_loc (loc, code, type, gimple_assign_rhs1 (stmt), | |
347 | gimple_assign_rhs2 (stmt), | |
348 | gimple_assign_rhs3 (stmt)); | |
349 | else if (get_gimple_rhs_class (code) == GIMPLE_BINARY_RHS) | |
389dd41b | 350 | return fold_build2_loc (loc, code, type, gimple_assign_rhs1 (stmt), |
fb8ed03f | 351 | gimple_assign_rhs2 (stmt)); |
75a70cf9 | 352 | else if (get_gimple_rhs_class (code) == GIMPLE_UNARY_RHS) |
fb8ed03f | 353 | return build1 (code, type, gimple_assign_rhs1 (stmt)); |
75a70cf9 | 354 | else if (get_gimple_rhs_class (code) == GIMPLE_SINGLE_RHS) |
355 | return gimple_assign_rhs1 (stmt); | |
356 | else | |
357 | gcc_unreachable (); | |
358 | } | |
359 | ||
5adc1066 | 360 | /* Combine OP0 CODE OP1 in the context of a COND_EXPR. Returns |
361 | the folded result in a form suitable for COND_EXPR_COND or | |
362 | NULL_TREE, if there is no suitable simplified form. If | |
363 | INVARIANT_ONLY is true only gimple_min_invariant results are | |
364 | considered simplified. */ | |
8f628ee8 | 365 | |
366 | static tree | |
c73fee76 | 367 | combine_cond_expr_cond (gimple stmt, enum tree_code code, tree type, |
5adc1066 | 368 | tree op0, tree op1, bool invariant_only) |
8f628ee8 | 369 | { |
5adc1066 | 370 | tree t; |
8f628ee8 | 371 | |
5adc1066 | 372 | gcc_assert (TREE_CODE_CLASS (code) == tcc_comparison); |
8f628ee8 | 373 | |
c73fee76 | 374 | fold_defer_overflow_warnings (); |
375 | t = fold_binary_loc (gimple_location (stmt), code, type, op0, op1); | |
5adc1066 | 376 | if (!t) |
c73fee76 | 377 | { |
378 | fold_undefer_overflow_warnings (false, NULL, 0); | |
379 | return NULL_TREE; | |
380 | } | |
8f628ee8 | 381 | |
5adc1066 | 382 | /* Require that we got a boolean type out if we put one in. */ |
383 | gcc_assert (TREE_CODE (TREE_TYPE (t)) == TREE_CODE (type)); | |
8f628ee8 | 384 | |
a7392604 | 385 | /* Canonicalize the combined condition for use in a COND_EXPR. */ |
386 | t = canonicalize_cond_expr_cond (t); | |
8f628ee8 | 387 | |
5adc1066 | 388 | /* Bail out if we required an invariant but didn't get one. */ |
75a70cf9 | 389 | if (!t || (invariant_only && !is_gimple_min_invariant (t))) |
c73fee76 | 390 | { |
391 | fold_undefer_overflow_warnings (false, NULL, 0); | |
392 | return NULL_TREE; | |
393 | } | |
394 | ||
395 | fold_undefer_overflow_warnings (!gimple_no_warning_p (stmt), stmt, 0); | |
8f628ee8 | 396 | |
a7392604 | 397 | return t; |
8f628ee8 | 398 | } |
399 | ||
c8126d25 | 400 | /* Combine the comparison OP0 CODE OP1 at LOC with the defining statements |
401 | of its operand. Return a new comparison tree or NULL_TREE if there | |
402 | were no simplifying combines. */ | |
403 | ||
404 | static tree | |
c73fee76 | 405 | forward_propagate_into_comparison_1 (gimple stmt, |
678b2f5b | 406 | enum tree_code code, tree type, |
407 | tree op0, tree op1) | |
c8126d25 | 408 | { |
409 | tree tmp = NULL_TREE; | |
410 | tree rhs0 = NULL_TREE, rhs1 = NULL_TREE; | |
411 | bool single_use0_p = false, single_use1_p = false; | |
412 | ||
413 | /* For comparisons use the first operand, that is likely to | |
414 | simplify comparisons against constants. */ | |
415 | if (TREE_CODE (op0) == SSA_NAME) | |
416 | { | |
417 | gimple def_stmt = get_prop_source_stmt (op0, false, &single_use0_p); | |
418 | if (def_stmt && can_propagate_from (def_stmt)) | |
419 | { | |
420 | rhs0 = rhs_to_tree (TREE_TYPE (op1), def_stmt); | |
c73fee76 | 421 | tmp = combine_cond_expr_cond (stmt, code, type, |
c8126d25 | 422 | rhs0, op1, !single_use0_p); |
423 | if (tmp) | |
424 | return tmp; | |
425 | } | |
426 | } | |
427 | ||
428 | /* If that wasn't successful, try the second operand. */ | |
429 | if (TREE_CODE (op1) == SSA_NAME) | |
430 | { | |
431 | gimple def_stmt = get_prop_source_stmt (op1, false, &single_use1_p); | |
432 | if (def_stmt && can_propagate_from (def_stmt)) | |
433 | { | |
434 | rhs1 = rhs_to_tree (TREE_TYPE (op0), def_stmt); | |
c73fee76 | 435 | tmp = combine_cond_expr_cond (stmt, code, type, |
c8126d25 | 436 | op0, rhs1, !single_use1_p); |
437 | if (tmp) | |
438 | return tmp; | |
439 | } | |
440 | } | |
441 | ||
442 | /* If that wasn't successful either, try both operands. */ | |
443 | if (rhs0 != NULL_TREE | |
444 | && rhs1 != NULL_TREE) | |
c73fee76 | 445 | tmp = combine_cond_expr_cond (stmt, code, type, |
c8126d25 | 446 | rhs0, rhs1, |
447 | !(single_use0_p && single_use1_p)); | |
448 | ||
449 | return tmp; | |
450 | } | |
451 | ||
678b2f5b | 452 | /* Propagate from the ssa name definition statements of the assignment |
453 | from a comparison at *GSI into the conditional if that simplifies it. | |
6f9714b3 | 454 | Returns 1 if the stmt was modified and 2 if the CFG needs cleanup, |
455 | otherwise returns 0. */ | |
c8126d25 | 456 | |
6f9714b3 | 457 | static int |
678b2f5b | 458 | forward_propagate_into_comparison (gimple_stmt_iterator *gsi) |
c8126d25 | 459 | { |
678b2f5b | 460 | gimple stmt = gsi_stmt (*gsi); |
461 | tree tmp; | |
6f9714b3 | 462 | bool cfg_changed = false; |
56632de0 | 463 | tree type = TREE_TYPE (gimple_assign_lhs (stmt)); |
6f9714b3 | 464 | tree rhs1 = gimple_assign_rhs1 (stmt); |
465 | tree rhs2 = gimple_assign_rhs2 (stmt); | |
c8126d25 | 466 | |
467 | /* Combine the comparison with defining statements. */ | |
c73fee76 | 468 | tmp = forward_propagate_into_comparison_1 (stmt, |
678b2f5b | 469 | gimple_assign_rhs_code (stmt), |
56632de0 | 470 | type, rhs1, rhs2); |
471 | if (tmp && useless_type_conversion_p (type, TREE_TYPE (tmp))) | |
c8126d25 | 472 | { |
678b2f5b | 473 | gimple_assign_set_rhs_from_tree (gsi, tmp); |
50aacf4c | 474 | fold_stmt (gsi); |
475 | update_stmt (gsi_stmt (*gsi)); | |
75200312 | 476 | |
6f9714b3 | 477 | if (TREE_CODE (rhs1) == SSA_NAME) |
478 | cfg_changed |= remove_prop_source_from_use (rhs1); | |
479 | if (TREE_CODE (rhs2) == SSA_NAME) | |
480 | cfg_changed |= remove_prop_source_from_use (rhs2); | |
481 | return cfg_changed ? 2 : 1; | |
c8126d25 | 482 | } |
483 | ||
6f9714b3 | 484 | return 0; |
c8126d25 | 485 | } |
486 | ||
5adc1066 | 487 | /* Propagate from the ssa name definition statements of COND_EXPR |
75a70cf9 | 488 | in GIMPLE_COND statement STMT into the conditional if that simplifies it. |
489 | Returns zero if no statement was changed, one if there were | |
490 | changes and two if cfg_cleanup needs to run. | |
48e1416a | 491 | |
75a70cf9 | 492 | This must be kept in sync with forward_propagate_into_cond. */ |
493 | ||
494 | static int | |
495 | forward_propagate_into_gimple_cond (gimple stmt) | |
496 | { | |
678b2f5b | 497 | tree tmp; |
498 | enum tree_code code = gimple_cond_code (stmt); | |
6f9714b3 | 499 | bool cfg_changed = false; |
500 | tree rhs1 = gimple_cond_lhs (stmt); | |
501 | tree rhs2 = gimple_cond_rhs (stmt); | |
678b2f5b | 502 | |
503 | /* We can do tree combining on SSA_NAME and comparison expressions. */ | |
504 | if (TREE_CODE_CLASS (gimple_cond_code (stmt)) != tcc_comparison) | |
505 | return 0; | |
506 | ||
c73fee76 | 507 | tmp = forward_propagate_into_comparison_1 (stmt, code, |
678b2f5b | 508 | boolean_type_node, |
6f9714b3 | 509 | rhs1, rhs2); |
678b2f5b | 510 | if (tmp) |
511 | { | |
512 | if (dump_file && tmp) | |
513 | { | |
678b2f5b | 514 | fprintf (dump_file, " Replaced '"); |
6f9714b3 | 515 | print_gimple_expr (dump_file, stmt, 0, 0); |
678b2f5b | 516 | fprintf (dump_file, "' with '"); |
517 | print_generic_expr (dump_file, tmp, 0); | |
518 | fprintf (dump_file, "'\n"); | |
519 | } | |
75a70cf9 | 520 | |
678b2f5b | 521 | gimple_cond_set_condition_from_tree (stmt, unshare_expr (tmp)); |
522 | update_stmt (stmt); | |
75a70cf9 | 523 | |
6f9714b3 | 524 | if (TREE_CODE (rhs1) == SSA_NAME) |
525 | cfg_changed |= remove_prop_source_from_use (rhs1); | |
526 | if (TREE_CODE (rhs2) == SSA_NAME) | |
527 | cfg_changed |= remove_prop_source_from_use (rhs2); | |
528 | return (cfg_changed || is_gimple_min_invariant (tmp)) ? 2 : 1; | |
678b2f5b | 529 | } |
75a70cf9 | 530 | |
10a6edd6 | 531 | /* Canonicalize _Bool == 0 and _Bool != 1 to _Bool != 0 by swapping edges. */ |
532 | if ((TREE_CODE (TREE_TYPE (rhs1)) == BOOLEAN_TYPE | |
533 | || (INTEGRAL_TYPE_P (TREE_TYPE (rhs1)) | |
534 | && TYPE_PRECISION (TREE_TYPE (rhs1)) == 1)) | |
535 | && ((code == EQ_EXPR | |
536 | && integer_zerop (rhs2)) | |
537 | || (code == NE_EXPR | |
538 | && integer_onep (rhs2)))) | |
539 | { | |
540 | basic_block bb = gimple_bb (stmt); | |
541 | gimple_cond_set_code (stmt, NE_EXPR); | |
542 | gimple_cond_set_rhs (stmt, build_zero_cst (TREE_TYPE (rhs1))); | |
543 | EDGE_SUCC (bb, 0)->flags ^= (EDGE_TRUE_VALUE|EDGE_FALSE_VALUE); | |
544 | EDGE_SUCC (bb, 1)->flags ^= (EDGE_TRUE_VALUE|EDGE_FALSE_VALUE); | |
545 | return 1; | |
546 | } | |
547 | ||
6f9714b3 | 548 | return 0; |
75a70cf9 | 549 | } |
550 | ||
551 | ||
552 | /* Propagate from the ssa name definition statements of COND_EXPR | |
553 | in the rhs of statement STMT into the conditional if that simplifies it. | |
8a2caf10 | 554 | Returns true zero if the stmt was changed. */ |
4ee9c684 | 555 | |
8a2caf10 | 556 | static bool |
75a70cf9 | 557 | forward_propagate_into_cond (gimple_stmt_iterator *gsi_p) |
e6dfde59 | 558 | { |
75a70cf9 | 559 | gimple stmt = gsi_stmt (*gsi_p); |
678b2f5b | 560 | tree tmp = NULL_TREE; |
561 | tree cond = gimple_assign_rhs1 (stmt); | |
def3cb70 | 562 | enum tree_code code = gimple_assign_rhs_code (stmt); |
10a6edd6 | 563 | bool swap = false; |
d080be9e | 564 | |
678b2f5b | 565 | /* We can do tree combining on SSA_NAME and comparison expressions. */ |
566 | if (COMPARISON_CLASS_P (cond)) | |
c73fee76 | 567 | tmp = forward_propagate_into_comparison_1 (stmt, TREE_CODE (cond), |
f2c1848b | 568 | TREE_TYPE (cond), |
c8126d25 | 569 | TREE_OPERAND (cond, 0), |
570 | TREE_OPERAND (cond, 1)); | |
678b2f5b | 571 | else if (TREE_CODE (cond) == SSA_NAME) |
572 | { | |
def3cb70 | 573 | enum tree_code def_code; |
8a2caf10 | 574 | tree name = cond; |
678b2f5b | 575 | gimple def_stmt = get_prop_source_stmt (name, true, NULL); |
576 | if (!def_stmt || !can_propagate_from (def_stmt)) | |
6f9714b3 | 577 | return 0; |
5adc1066 | 578 | |
def3cb70 | 579 | def_code = gimple_assign_rhs_code (def_stmt); |
580 | if (TREE_CODE_CLASS (def_code) == tcc_comparison) | |
8a2caf10 | 581 | tmp = fold_build2_loc (gimple_location (def_stmt), |
def3cb70 | 582 | def_code, |
bc112f18 | 583 | TREE_TYPE (cond), |
8a2caf10 | 584 | gimple_assign_rhs1 (def_stmt), |
585 | gimple_assign_rhs2 (def_stmt)); | |
def3cb70 | 586 | else if (code == COND_EXPR |
587 | && ((def_code == BIT_NOT_EXPR | |
588 | && TYPE_PRECISION (TREE_TYPE (cond)) == 1) | |
589 | || (def_code == BIT_XOR_EXPR | |
590 | && integer_onep (gimple_assign_rhs2 (def_stmt))))) | |
10a6edd6 | 591 | { |
592 | tmp = gimple_assign_rhs1 (def_stmt); | |
593 | swap = true; | |
594 | } | |
678b2f5b | 595 | } |
5adc1066 | 596 | |
25f48be0 | 597 | if (tmp |
598 | && is_gimple_condexpr (tmp)) | |
678b2f5b | 599 | { |
600 | if (dump_file && tmp) | |
601 | { | |
602 | fprintf (dump_file, " Replaced '"); | |
603 | print_generic_expr (dump_file, cond, 0); | |
604 | fprintf (dump_file, "' with '"); | |
605 | print_generic_expr (dump_file, tmp, 0); | |
606 | fprintf (dump_file, "'\n"); | |
607 | } | |
d080be9e | 608 | |
def3cb70 | 609 | if ((code == VEC_COND_EXPR) ? integer_all_onesp (tmp) |
610 | : integer_onep (tmp)) | |
8a2caf10 | 611 | gimple_assign_set_rhs_from_tree (gsi_p, gimple_assign_rhs2 (stmt)); |
612 | else if (integer_zerop (tmp)) | |
613 | gimple_assign_set_rhs_from_tree (gsi_p, gimple_assign_rhs3 (stmt)); | |
614 | else | |
10a6edd6 | 615 | { |
616 | gimple_assign_set_rhs1 (stmt, unshare_expr (tmp)); | |
617 | if (swap) | |
618 | { | |
619 | tree t = gimple_assign_rhs2 (stmt); | |
620 | gimple_assign_set_rhs2 (stmt, gimple_assign_rhs3 (stmt)); | |
621 | gimple_assign_set_rhs3 (stmt, t); | |
622 | } | |
623 | } | |
678b2f5b | 624 | stmt = gsi_stmt (*gsi_p); |
625 | update_stmt (stmt); | |
5adc1066 | 626 | |
8a2caf10 | 627 | return true; |
678b2f5b | 628 | } |
d080be9e | 629 | |
6f9714b3 | 630 | return 0; |
4ee9c684 | 631 | } |
632 | ||
360b78f3 | 633 | /* Propagate from the ssa name definition statements of COND_EXPR |
634 | values in the rhs of statement STMT into the conditional arms | |
635 | if that simplifies it. | |
636 | Returns true if the stmt was changed. */ | |
637 | ||
638 | static bool | |
639 | combine_cond_exprs (gimple_stmt_iterator *gsi_p) | |
640 | { | |
641 | gimple stmt = gsi_stmt (*gsi_p); | |
642 | tree cond, val1, val2; | |
643 | bool changed = false; | |
644 | ||
645 | cond = gimple_assign_rhs1 (stmt); | |
646 | val1 = gimple_assign_rhs2 (stmt); | |
647 | if (TREE_CODE (val1) == SSA_NAME) | |
648 | { | |
649 | gimple def_stmt = SSA_NAME_DEF_STMT (val1); | |
650 | if (is_gimple_assign (def_stmt) | |
651 | && gimple_assign_rhs_code (def_stmt) == gimple_assign_rhs_code (stmt) | |
652 | && operand_equal_p (gimple_assign_rhs1 (def_stmt), cond, 0)) | |
653 | { | |
654 | val1 = unshare_expr (gimple_assign_rhs2 (def_stmt)); | |
655 | gimple_assign_set_rhs2 (stmt, val1); | |
656 | changed = true; | |
657 | } | |
658 | } | |
659 | val2 = gimple_assign_rhs3 (stmt); | |
660 | if (TREE_CODE (val2) == SSA_NAME) | |
661 | { | |
662 | gimple def_stmt = SSA_NAME_DEF_STMT (val2); | |
663 | if (is_gimple_assign (def_stmt) | |
664 | && gimple_assign_rhs_code (def_stmt) == gimple_assign_rhs_code (stmt) | |
665 | && operand_equal_p (gimple_assign_rhs1 (def_stmt), cond, 0)) | |
666 | { | |
667 | val2 = unshare_expr (gimple_assign_rhs3 (def_stmt)); | |
668 | gimple_assign_set_rhs3 (stmt, val2); | |
669 | changed = true; | |
670 | } | |
671 | } | |
672 | if (operand_equal_p (val1, val2, 0)) | |
673 | { | |
674 | gimple_assign_set_rhs_from_tree (gsi_p, val1); | |
675 | stmt = gsi_stmt (*gsi_p); | |
676 | changed = true; | |
677 | } | |
678 | ||
679 | if (changed) | |
680 | update_stmt (stmt); | |
681 | ||
682 | return changed; | |
683 | } | |
684 | ||
48e1416a | 685 | /* We've just substituted an ADDR_EXPR into stmt. Update all the |
148aa112 | 686 | relevant data structures to match. */ |
687 | ||
688 | static void | |
75a70cf9 | 689 | tidy_after_forward_propagate_addr (gimple stmt) |
148aa112 | 690 | { |
148aa112 | 691 | /* We may have turned a trapping insn into a non-trapping insn. */ |
692 | if (maybe_clean_or_replace_eh_stmt (stmt, stmt) | |
75a70cf9 | 693 | && gimple_purge_dead_eh_edges (gimple_bb (stmt))) |
148aa112 | 694 | cfg_changed = true; |
f2fae51f | 695 | |
75a70cf9 | 696 | if (TREE_CODE (gimple_assign_rhs1 (stmt)) == ADDR_EXPR) |
697 | recompute_tree_invariant_for_addr_expr (gimple_assign_rhs1 (stmt)); | |
148aa112 | 698 | } |
699 | ||
15ec875c | 700 | /* NAME is a SSA_NAME representing DEF_RHS which is of the form |
701 | ADDR_EXPR <whatever>. | |
291d763b | 702 | |
3d5cfe81 | 703 | Try to forward propagate the ADDR_EXPR into the use USE_STMT. |
291d763b | 704 | Often this will allow for removal of an ADDR_EXPR and INDIRECT_REF |
3d5cfe81 | 705 | node or for recovery of array indexing from pointer arithmetic. |
75a70cf9 | 706 | |
6b5a5c42 | 707 | Return true if the propagation was successful (the propagation can |
708 | be not totally successful, yet things may have been changed). */ | |
291d763b | 709 | |
710 | static bool | |
75a70cf9 | 711 | forward_propagate_addr_expr_1 (tree name, tree def_rhs, |
712 | gimple_stmt_iterator *use_stmt_gsi, | |
6776dec8 | 713 | bool single_use_p) |
291d763b | 714 | { |
75a70cf9 | 715 | tree lhs, rhs, rhs2, array_ref; |
75a70cf9 | 716 | gimple use_stmt = gsi_stmt (*use_stmt_gsi); |
717 | enum tree_code rhs_code; | |
9e019299 | 718 | bool res = true; |
291d763b | 719 | |
971c637a | 720 | gcc_assert (TREE_CODE (def_rhs) == ADDR_EXPR); |
291d763b | 721 | |
75a70cf9 | 722 | lhs = gimple_assign_lhs (use_stmt); |
723 | rhs_code = gimple_assign_rhs_code (use_stmt); | |
724 | rhs = gimple_assign_rhs1 (use_stmt); | |
15ec875c | 725 | |
bfb89138 | 726 | /* Do not perform copy-propagation but recurse through copy chains. */ |
727 | if (TREE_CODE (lhs) == SSA_NAME | |
728 | && rhs_code == SSA_NAME) | |
729 | return forward_propagate_addr_expr (lhs, def_rhs, single_use_p); | |
730 | ||
731 | /* The use statement could be a conversion. Recurse to the uses of the | |
732 | lhs as copyprop does not copy through pointer to integer to pointer | |
733 | conversions and FRE does not catch all cases either. | |
734 | Treat the case of a single-use name and | |
6776dec8 | 735 | a conversion to def_rhs type separate, though. */ |
971c637a | 736 | if (TREE_CODE (lhs) == SSA_NAME |
bfb89138 | 737 | && CONVERT_EXPR_CODE_P (rhs_code)) |
6776dec8 | 738 | { |
bfb89138 | 739 | /* If there is a point in a conversion chain where the types match |
740 | so we can remove a conversion re-materialize the address here | |
741 | and stop. */ | |
742 | if (single_use_p | |
743 | && useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (def_rhs))) | |
744 | { | |
745 | gimple_assign_set_rhs1 (use_stmt, unshare_expr (def_rhs)); | |
746 | gimple_assign_set_rhs_code (use_stmt, TREE_CODE (def_rhs)); | |
747 | return true; | |
748 | } | |
749 | ||
750 | /* Else recurse if the conversion preserves the address value. */ | |
751 | if ((INTEGRAL_TYPE_P (TREE_TYPE (lhs)) | |
752 | || POINTER_TYPE_P (TREE_TYPE (lhs))) | |
753 | && (TYPE_PRECISION (TREE_TYPE (lhs)) | |
754 | >= TYPE_PRECISION (TREE_TYPE (def_rhs)))) | |
755 | return forward_propagate_addr_expr (lhs, def_rhs, single_use_p); | |
756 | ||
757 | return false; | |
6776dec8 | 758 | } |
971c637a | 759 | |
bfb89138 | 760 | /* If this isn't a conversion chain from this on we only can propagate |
761 | into compatible pointer contexts. */ | |
762 | if (!types_compatible_p (TREE_TYPE (name), TREE_TYPE (def_rhs))) | |
763 | return false; | |
764 | ||
182cf5a9 | 765 | /* Propagate through constant pointer adjustments. */ |
766 | if (TREE_CODE (lhs) == SSA_NAME | |
767 | && rhs_code == POINTER_PLUS_EXPR | |
768 | && rhs == name | |
769 | && TREE_CODE (gimple_assign_rhs2 (use_stmt)) == INTEGER_CST) | |
770 | { | |
771 | tree new_def_rhs; | |
772 | /* As we come here with non-invariant addresses in def_rhs we need | |
773 | to make sure we can build a valid constant offsetted address | |
774 | for further propagation. Simply rely on fold building that | |
775 | and check after the fact. */ | |
776 | new_def_rhs = fold_build2 (MEM_REF, TREE_TYPE (TREE_TYPE (rhs)), | |
777 | def_rhs, | |
778 | fold_convert (ptr_type_node, | |
779 | gimple_assign_rhs2 (use_stmt))); | |
780 | if (TREE_CODE (new_def_rhs) == MEM_REF | |
f5d03f27 | 781 | && !is_gimple_mem_ref_addr (TREE_OPERAND (new_def_rhs, 0))) |
182cf5a9 | 782 | return false; |
783 | new_def_rhs = build_fold_addr_expr_with_type (new_def_rhs, | |
784 | TREE_TYPE (rhs)); | |
785 | ||
786 | /* Recurse. If we could propagate into all uses of lhs do not | |
787 | bother to replace into the current use but just pretend we did. */ | |
788 | if (TREE_CODE (new_def_rhs) == ADDR_EXPR | |
bfb89138 | 789 | && forward_propagate_addr_expr (lhs, new_def_rhs, single_use_p)) |
182cf5a9 | 790 | return true; |
791 | ||
792 | if (useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (new_def_rhs))) | |
793 | gimple_assign_set_rhs_with_ops (use_stmt_gsi, TREE_CODE (new_def_rhs), | |
794 | new_def_rhs, NULL_TREE); | |
795 | else if (is_gimple_min_invariant (new_def_rhs)) | |
796 | gimple_assign_set_rhs_with_ops (use_stmt_gsi, NOP_EXPR, | |
797 | new_def_rhs, NULL_TREE); | |
798 | else | |
799 | return false; | |
800 | gcc_assert (gsi_stmt (*use_stmt_gsi) == use_stmt); | |
801 | update_stmt (use_stmt); | |
802 | return true; | |
803 | } | |
804 | ||
48e1416a | 805 | /* Now strip away any outer COMPONENT_REF/ARRAY_REF nodes from the LHS. |
971c637a | 806 | ADDR_EXPR will not appear on the LHS. */ |
d0d1ecb8 | 807 | tree *lhsp = gimple_assign_lhs_ptr (use_stmt); |
808 | while (handled_component_p (*lhsp)) | |
809 | lhsp = &TREE_OPERAND (*lhsp, 0); | |
810 | lhs = *lhsp; | |
971c637a | 811 | |
182cf5a9 | 812 | /* Now see if the LHS node is a MEM_REF using NAME. If so, |
971c637a | 813 | propagate the ADDR_EXPR into the use of NAME and fold the result. */ |
182cf5a9 | 814 | if (TREE_CODE (lhs) == MEM_REF |
9e019299 | 815 | && TREE_OPERAND (lhs, 0) == name) |
971c637a | 816 | { |
182cf5a9 | 817 | tree def_rhs_base; |
818 | HOST_WIDE_INT def_rhs_offset; | |
819 | /* If the address is invariant we can always fold it. */ | |
820 | if ((def_rhs_base = get_addr_base_and_unit_offset (TREE_OPERAND (def_rhs, 0), | |
821 | &def_rhs_offset))) | |
9e019299 | 822 | { |
5de9d3ed | 823 | offset_int off = mem_ref_offset (lhs); |
182cf5a9 | 824 | tree new_ptr; |
e913b5cd | 825 | off += def_rhs_offset; |
182cf5a9 | 826 | if (TREE_CODE (def_rhs_base) == MEM_REF) |
827 | { | |
cf8f0e63 | 828 | off += mem_ref_offset (def_rhs_base); |
182cf5a9 | 829 | new_ptr = TREE_OPERAND (def_rhs_base, 0); |
830 | } | |
831 | else | |
832 | new_ptr = build_fold_addr_expr (def_rhs_base); | |
833 | TREE_OPERAND (lhs, 0) = new_ptr; | |
834 | TREE_OPERAND (lhs, 1) | |
e913b5cd | 835 | = wide_int_to_tree (TREE_TYPE (TREE_OPERAND (lhs, 1)), off); |
9e019299 | 836 | tidy_after_forward_propagate_addr (use_stmt); |
9e019299 | 837 | /* Continue propagating into the RHS if this was not the only use. */ |
838 | if (single_use_p) | |
839 | return true; | |
840 | } | |
182cf5a9 | 841 | /* If the LHS is a plain dereference and the value type is the same as |
842 | that of the pointed-to type of the address we can put the | |
843 | dereferenced address on the LHS preserving the original alias-type. */ | |
d0d1ecb8 | 844 | else if (integer_zerop (TREE_OPERAND (lhs, 1)) |
845 | && ((gimple_assign_lhs (use_stmt) == lhs | |
846 | && useless_type_conversion_p | |
847 | (TREE_TYPE (TREE_OPERAND (def_rhs, 0)), | |
848 | TREE_TYPE (gimple_assign_rhs1 (use_stmt)))) | |
849 | || types_compatible_p (TREE_TYPE (lhs), | |
850 | TREE_TYPE (TREE_OPERAND (def_rhs, 0)))) | |
f6e2e4ff | 851 | /* Don't forward anything into clobber stmts if it would result |
852 | in the lhs no longer being a MEM_REF. */ | |
853 | && (!gimple_clobber_p (use_stmt) | |
854 | || TREE_CODE (TREE_OPERAND (def_rhs, 0)) == MEM_REF)) | |
182cf5a9 | 855 | { |
856 | tree *def_rhs_basep = &TREE_OPERAND (def_rhs, 0); | |
98d96c6f | 857 | tree new_offset, new_base, saved, new_lhs; |
182cf5a9 | 858 | while (handled_component_p (*def_rhs_basep)) |
859 | def_rhs_basep = &TREE_OPERAND (*def_rhs_basep, 0); | |
860 | saved = *def_rhs_basep; | |
861 | if (TREE_CODE (*def_rhs_basep) == MEM_REF) | |
862 | { | |
863 | new_base = TREE_OPERAND (*def_rhs_basep, 0); | |
b97e39a0 | 864 | new_offset = fold_convert (TREE_TYPE (TREE_OPERAND (lhs, 1)), |
865 | TREE_OPERAND (*def_rhs_basep, 1)); | |
182cf5a9 | 866 | } |
867 | else | |
868 | { | |
869 | new_base = build_fold_addr_expr (*def_rhs_basep); | |
870 | new_offset = TREE_OPERAND (lhs, 1); | |
871 | } | |
872 | *def_rhs_basep = build2 (MEM_REF, TREE_TYPE (*def_rhs_basep), | |
873 | new_base, new_offset); | |
2e5dc41c | 874 | TREE_THIS_VOLATILE (*def_rhs_basep) = TREE_THIS_VOLATILE (lhs); |
31fa5b0d | 875 | TREE_SIDE_EFFECTS (*def_rhs_basep) = TREE_SIDE_EFFECTS (lhs); |
2e5dc41c | 876 | TREE_THIS_NOTRAP (*def_rhs_basep) = TREE_THIS_NOTRAP (lhs); |
98d96c6f | 877 | new_lhs = unshare_expr (TREE_OPERAND (def_rhs, 0)); |
d0d1ecb8 | 878 | *lhsp = new_lhs; |
98d96c6f | 879 | TREE_THIS_VOLATILE (new_lhs) = TREE_THIS_VOLATILE (lhs); |
31fa5b0d | 880 | TREE_SIDE_EFFECTS (new_lhs) = TREE_SIDE_EFFECTS (lhs); |
182cf5a9 | 881 | *def_rhs_basep = saved; |
882 | tidy_after_forward_propagate_addr (use_stmt); | |
883 | /* Continue propagating into the RHS if this was not the | |
884 | only use. */ | |
885 | if (single_use_p) | |
886 | return true; | |
887 | } | |
9e019299 | 888 | else |
889 | /* We can have a struct assignment dereferencing our name twice. | |
890 | Note that we didn't propagate into the lhs to not falsely | |
891 | claim we did when propagating into the rhs. */ | |
892 | res = false; | |
971c637a | 893 | } |
15ec875c | 894 | |
631d5db6 | 895 | /* Strip away any outer COMPONENT_REF, ARRAY_REF or ADDR_EXPR |
896 | nodes from the RHS. */ | |
d0d1ecb8 | 897 | tree *rhsp = gimple_assign_rhs1_ptr (use_stmt); |
898 | if (TREE_CODE (*rhsp) == ADDR_EXPR) | |
899 | rhsp = &TREE_OPERAND (*rhsp, 0); | |
900 | while (handled_component_p (*rhsp)) | |
901 | rhsp = &TREE_OPERAND (*rhsp, 0); | |
902 | rhs = *rhsp; | |
291d763b | 903 | |
182cf5a9 | 904 | /* Now see if the RHS node is a MEM_REF using NAME. If so, |
291d763b | 905 | propagate the ADDR_EXPR into the use of NAME and fold the result. */ |
182cf5a9 | 906 | if (TREE_CODE (rhs) == MEM_REF |
907 | && TREE_OPERAND (rhs, 0) == name) | |
291d763b | 908 | { |
182cf5a9 | 909 | tree def_rhs_base; |
910 | HOST_WIDE_INT def_rhs_offset; | |
911 | if ((def_rhs_base = get_addr_base_and_unit_offset (TREE_OPERAND (def_rhs, 0), | |
912 | &def_rhs_offset))) | |
913 | { | |
5de9d3ed | 914 | offset_int off = mem_ref_offset (rhs); |
182cf5a9 | 915 | tree new_ptr; |
e913b5cd | 916 | off += def_rhs_offset; |
182cf5a9 | 917 | if (TREE_CODE (def_rhs_base) == MEM_REF) |
918 | { | |
cf8f0e63 | 919 | off += mem_ref_offset (def_rhs_base); |
182cf5a9 | 920 | new_ptr = TREE_OPERAND (def_rhs_base, 0); |
921 | } | |
922 | else | |
923 | new_ptr = build_fold_addr_expr (def_rhs_base); | |
924 | TREE_OPERAND (rhs, 0) = new_ptr; | |
925 | TREE_OPERAND (rhs, 1) | |
e913b5cd | 926 | = wide_int_to_tree (TREE_TYPE (TREE_OPERAND (rhs, 1)), off); |
50aacf4c | 927 | fold_stmt_inplace (use_stmt_gsi); |
182cf5a9 | 928 | tidy_after_forward_propagate_addr (use_stmt); |
929 | return res; | |
930 | } | |
2e5dc41c | 931 | /* If the RHS is a plain dereference and the value type is the same as |
182cf5a9 | 932 | that of the pointed-to type of the address we can put the |
2e5dc41c | 933 | dereferenced address on the RHS preserving the original alias-type. */ |
d0d1ecb8 | 934 | else if (integer_zerop (TREE_OPERAND (rhs, 1)) |
935 | && ((gimple_assign_rhs1 (use_stmt) == rhs | |
936 | && useless_type_conversion_p | |
937 | (TREE_TYPE (gimple_assign_lhs (use_stmt)), | |
938 | TREE_TYPE (TREE_OPERAND (def_rhs, 0)))) | |
939 | || types_compatible_p (TREE_TYPE (rhs), | |
940 | TREE_TYPE (TREE_OPERAND (def_rhs, 0))))) | |
182cf5a9 | 941 | { |
942 | tree *def_rhs_basep = &TREE_OPERAND (def_rhs, 0); | |
98d96c6f | 943 | tree new_offset, new_base, saved, new_rhs; |
182cf5a9 | 944 | while (handled_component_p (*def_rhs_basep)) |
945 | def_rhs_basep = &TREE_OPERAND (*def_rhs_basep, 0); | |
946 | saved = *def_rhs_basep; | |
947 | if (TREE_CODE (*def_rhs_basep) == MEM_REF) | |
948 | { | |
949 | new_base = TREE_OPERAND (*def_rhs_basep, 0); | |
b97e39a0 | 950 | new_offset = fold_convert (TREE_TYPE (TREE_OPERAND (rhs, 1)), |
951 | TREE_OPERAND (*def_rhs_basep, 1)); | |
182cf5a9 | 952 | } |
953 | else | |
954 | { | |
955 | new_base = build_fold_addr_expr (*def_rhs_basep); | |
956 | new_offset = TREE_OPERAND (rhs, 1); | |
957 | } | |
958 | *def_rhs_basep = build2 (MEM_REF, TREE_TYPE (*def_rhs_basep), | |
959 | new_base, new_offset); | |
2e5dc41c | 960 | TREE_THIS_VOLATILE (*def_rhs_basep) = TREE_THIS_VOLATILE (rhs); |
31fa5b0d | 961 | TREE_SIDE_EFFECTS (*def_rhs_basep) = TREE_SIDE_EFFECTS (rhs); |
2e5dc41c | 962 | TREE_THIS_NOTRAP (*def_rhs_basep) = TREE_THIS_NOTRAP (rhs); |
98d96c6f | 963 | new_rhs = unshare_expr (TREE_OPERAND (def_rhs, 0)); |
d0d1ecb8 | 964 | *rhsp = new_rhs; |
98d96c6f | 965 | TREE_THIS_VOLATILE (new_rhs) = TREE_THIS_VOLATILE (rhs); |
31fa5b0d | 966 | TREE_SIDE_EFFECTS (new_rhs) = TREE_SIDE_EFFECTS (rhs); |
182cf5a9 | 967 | *def_rhs_basep = saved; |
50aacf4c | 968 | fold_stmt_inplace (use_stmt_gsi); |
182cf5a9 | 969 | tidy_after_forward_propagate_addr (use_stmt); |
970 | return res; | |
971 | } | |
291d763b | 972 | } |
973 | ||
971c637a | 974 | /* If the use of the ADDR_EXPR is not a POINTER_PLUS_EXPR, there |
975 | is nothing to do. */ | |
75a70cf9 | 976 | if (gimple_assign_rhs_code (use_stmt) != POINTER_PLUS_EXPR |
977 | || gimple_assign_rhs1 (use_stmt) != name) | |
971c637a | 978 | return false; |
979 | ||
291d763b | 980 | /* The remaining cases are all for turning pointer arithmetic into |
981 | array indexing. They only apply when we have the address of | |
982 | element zero in an array. If that is not the case then there | |
983 | is nothing to do. */ | |
15ec875c | 984 | array_ref = TREE_OPERAND (def_rhs, 0); |
182cf5a9 | 985 | if ((TREE_CODE (array_ref) != ARRAY_REF |
986 | || TREE_CODE (TREE_TYPE (TREE_OPERAND (array_ref, 0))) != ARRAY_TYPE | |
987 | || TREE_CODE (TREE_OPERAND (array_ref, 1)) != INTEGER_CST) | |
988 | && TREE_CODE (TREE_TYPE (array_ref)) != ARRAY_TYPE) | |
291d763b | 989 | return false; |
990 | ||
75a70cf9 | 991 | rhs2 = gimple_assign_rhs2 (use_stmt); |
704d7315 | 992 | /* Optimize &x[C1] p+ C2 to &x p+ C3 with C3 = C1 * element_size + C2. */ |
75a70cf9 | 993 | if (TREE_CODE (rhs2) == INTEGER_CST) |
291d763b | 994 | { |
704d7315 | 995 | tree new_rhs = build1_loc (gimple_location (use_stmt), |
996 | ADDR_EXPR, TREE_TYPE (def_rhs), | |
997 | fold_build2 (MEM_REF, | |
998 | TREE_TYPE (TREE_TYPE (def_rhs)), | |
999 | unshare_expr (def_rhs), | |
1000 | fold_convert (ptr_type_node, | |
1001 | rhs2))); | |
1002 | gimple_assign_set_rhs_from_tree (use_stmt_gsi, new_rhs); | |
1003 | use_stmt = gsi_stmt (*use_stmt_gsi); | |
1004 | update_stmt (use_stmt); | |
1005 | tidy_after_forward_propagate_addr (use_stmt); | |
1006 | return true; | |
291d763b | 1007 | } |
1008 | ||
291d763b | 1009 | return false; |
1010 | } | |
1011 | ||
3d5cfe81 | 1012 | /* STMT is a statement of the form SSA_NAME = ADDR_EXPR <whatever>. |
1013 | ||
1014 | Try to forward propagate the ADDR_EXPR into all uses of the SSA_NAME. | |
1015 | Often this will allow for removal of an ADDR_EXPR and INDIRECT_REF | |
1016 | node or for recovery of array indexing from pointer arithmetic. | |
bfb89138 | 1017 | |
1018 | PARENT_SINGLE_USE_P tells if, when in a recursive invocation, NAME was | |
1019 | the single use in the previous invocation. Pass true when calling | |
1020 | this as toplevel. | |
1021 | ||
3d5cfe81 | 1022 | Returns true, if all uses have been propagated into. */ |
1023 | ||
1024 | static bool | |
bfb89138 | 1025 | forward_propagate_addr_expr (tree name, tree rhs, bool parent_single_use_p) |
3d5cfe81 | 1026 | { |
3d5cfe81 | 1027 | imm_use_iterator iter; |
75a70cf9 | 1028 | gimple use_stmt; |
3d5cfe81 | 1029 | bool all = true; |
bfb89138 | 1030 | bool single_use_p = parent_single_use_p && has_single_use (name); |
3d5cfe81 | 1031 | |
09aca5bc | 1032 | FOR_EACH_IMM_USE_STMT (use_stmt, iter, name) |
3d5cfe81 | 1033 | { |
c96420f8 | 1034 | bool result; |
9481f629 | 1035 | tree use_rhs; |
3d5cfe81 | 1036 | |
1037 | /* If the use is not in a simple assignment statement, then | |
1038 | there is nothing we can do. */ | |
162efce1 | 1039 | if (!is_gimple_assign (use_stmt)) |
3d5cfe81 | 1040 | { |
688ff29b | 1041 | if (!is_gimple_debug (use_stmt)) |
9845d120 | 1042 | all = false; |
3d5cfe81 | 1043 | continue; |
1044 | } | |
1045 | ||
162efce1 | 1046 | gimple_stmt_iterator gsi = gsi_for_stmt (use_stmt); |
1047 | result = forward_propagate_addr_expr_1 (name, rhs, &gsi, | |
1048 | single_use_p); | |
1049 | /* If the use has moved to a different statement adjust | |
1050 | the update machinery for the old statement too. */ | |
1051 | if (use_stmt != gsi_stmt (gsi)) | |
3d5cfe81 | 1052 | { |
162efce1 | 1053 | update_stmt (use_stmt); |
1054 | use_stmt = gsi_stmt (gsi); | |
3d5cfe81 | 1055 | } |
162efce1 | 1056 | update_stmt (use_stmt); |
c96420f8 | 1057 | all &= result; |
de6ed584 | 1058 | |
15ec875c | 1059 | /* Remove intermediate now unused copy and conversion chains. */ |
75a70cf9 | 1060 | use_rhs = gimple_assign_rhs1 (use_stmt); |
15ec875c | 1061 | if (result |
75a70cf9 | 1062 | && TREE_CODE (gimple_assign_lhs (use_stmt)) == SSA_NAME |
7b705d94 | 1063 | && TREE_CODE (use_rhs) == SSA_NAME |
1064 | && has_zero_uses (gimple_assign_lhs (use_stmt))) | |
15ec875c | 1065 | { |
75a70cf9 | 1066 | gimple_stmt_iterator gsi = gsi_for_stmt (use_stmt); |
15ec875c | 1067 | release_defs (use_stmt); |
75a70cf9 | 1068 | gsi_remove (&gsi, true); |
15ec875c | 1069 | } |
3d5cfe81 | 1070 | } |
1071 | ||
628ce22b | 1072 | return all && has_zero_uses (name); |
3d5cfe81 | 1073 | } |
1074 | ||
678b2f5b | 1075 | |
e3a19533 | 1076 | /* Forward propagate the comparison defined in *DEFGSI like |
678b2f5b | 1077 | cond_1 = x CMP y to uses of the form |
1078 | a_1 = (T')cond_1 | |
1079 | a_1 = !cond_1 | |
1080 | a_1 = cond_1 != 0 | |
e3a19533 | 1081 | Returns true if stmt is now unused. Advance DEFGSI to the next |
1082 | statement. */ | |
678b2f5b | 1083 | |
1084 | static bool | |
e3a19533 | 1085 | forward_propagate_comparison (gimple_stmt_iterator *defgsi) |
678b2f5b | 1086 | { |
e3a19533 | 1087 | gimple stmt = gsi_stmt (*defgsi); |
678b2f5b | 1088 | tree name = gimple_assign_lhs (stmt); |
1089 | gimple use_stmt; | |
1090 | tree tmp = NULL_TREE; | |
e5b1e080 | 1091 | gimple_stmt_iterator gsi; |
1092 | enum tree_code code; | |
1093 | tree lhs; | |
678b2f5b | 1094 | |
1095 | /* Don't propagate ssa names that occur in abnormal phis. */ | |
1096 | if ((TREE_CODE (gimple_assign_rhs1 (stmt)) == SSA_NAME | |
1097 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_assign_rhs1 (stmt))) | |
1098 | || (TREE_CODE (gimple_assign_rhs2 (stmt)) == SSA_NAME | |
1099 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_assign_rhs2 (stmt)))) | |
e3a19533 | 1100 | goto bailout; |
678b2f5b | 1101 | |
1102 | /* Do not un-cse comparisons. But propagate through copies. */ | |
1103 | use_stmt = get_prop_dest_stmt (name, &name); | |
e5b1e080 | 1104 | if (!use_stmt |
1105 | || !is_gimple_assign (use_stmt)) | |
e3a19533 | 1106 | goto bailout; |
678b2f5b | 1107 | |
e5b1e080 | 1108 | code = gimple_assign_rhs_code (use_stmt); |
1109 | lhs = gimple_assign_lhs (use_stmt); | |
1110 | if (!INTEGRAL_TYPE_P (TREE_TYPE (lhs))) | |
e3a19533 | 1111 | goto bailout; |
678b2f5b | 1112 | |
e5b1e080 | 1113 | /* We can propagate the condition into a statement that |
1114 | computes the logical negation of the comparison result. */ | |
4b5f1658 | 1115 | if ((code == BIT_NOT_EXPR |
1116 | && TYPE_PRECISION (TREE_TYPE (lhs)) == 1) | |
1117 | || (code == BIT_XOR_EXPR | |
1118 | && integer_onep (gimple_assign_rhs2 (use_stmt)))) | |
e5b1e080 | 1119 | { |
1120 | tree type = TREE_TYPE (gimple_assign_rhs1 (stmt)); | |
1121 | bool nans = HONOR_NANS (TYPE_MODE (type)); | |
1122 | enum tree_code inv_code; | |
1123 | inv_code = invert_tree_comparison (gimple_assign_rhs_code (stmt), nans); | |
1124 | if (inv_code == ERROR_MARK) | |
e3a19533 | 1125 | goto bailout; |
678b2f5b | 1126 | |
e5b1e080 | 1127 | tmp = build2 (inv_code, TREE_TYPE (lhs), gimple_assign_rhs1 (stmt), |
1128 | gimple_assign_rhs2 (stmt)); | |
1129 | } | |
1130 | else | |
e3a19533 | 1131 | goto bailout; |
678b2f5b | 1132 | |
e5b1e080 | 1133 | gsi = gsi_for_stmt (use_stmt); |
1134 | gimple_assign_set_rhs_from_tree (&gsi, unshare_expr (tmp)); | |
1135 | use_stmt = gsi_stmt (gsi); | |
1136 | update_stmt (use_stmt); | |
678b2f5b | 1137 | |
e5b1e080 | 1138 | if (dump_file && (dump_flags & TDF_DETAILS)) |
1139 | { | |
1140 | fprintf (dump_file, " Replaced '"); | |
1141 | print_gimple_expr (dump_file, stmt, 0, dump_flags); | |
1142 | fprintf (dump_file, "' with '"); | |
1143 | print_gimple_expr (dump_file, use_stmt, 0, dump_flags); | |
1144 | fprintf (dump_file, "'\n"); | |
678b2f5b | 1145 | } |
1146 | ||
e3a19533 | 1147 | /* When we remove stmt now the iterator defgsi goes off it's current |
1148 | sequence, hence advance it now. */ | |
1149 | gsi_next (defgsi); | |
1150 | ||
e5b1e080 | 1151 | /* Remove defining statements. */ |
1152 | return remove_prop_source_from_use (name); | |
e3a19533 | 1153 | |
1154 | bailout: | |
1155 | gsi_next (defgsi); | |
1156 | return false; | |
678b2f5b | 1157 | } |
1158 | ||
1159 | ||
d23e1965 | 1160 | /* GSI_P points to a statement which performs a narrowing integral |
1161 | conversion. | |
1162 | ||
1163 | Look for cases like: | |
1164 | ||
1165 | t = x & c; | |
1166 | y = (T) t; | |
1167 | ||
1168 | Turn them into: | |
1169 | ||
1170 | t = x & c; | |
1171 | y = (T) x; | |
1172 | ||
1173 | If T is narrower than X's type and C merely masks off bits outside | |
1174 | of (T) and nothing else. | |
1175 | ||
1176 | Normally we'd let DCE remove the dead statement. But no DCE runs | |
1177 | after the last forwprop/combine pass, so we remove the obviously | |
1178 | dead code ourselves. | |
1179 | ||
1180 | Return TRUE if a change was made, FALSE otherwise. */ | |
1181 | ||
1182 | static bool | |
1183 | simplify_conversion_from_bitmask (gimple_stmt_iterator *gsi_p) | |
1184 | { | |
1185 | gimple stmt = gsi_stmt (*gsi_p); | |
1186 | gimple rhs_def_stmt = SSA_NAME_DEF_STMT (gimple_assign_rhs1 (stmt)); | |
1187 | ||
1188 | /* See if the input for the conversion was set via a BIT_AND_EXPR and | |
1189 | the only use of the BIT_AND_EXPR result is the conversion. */ | |
1190 | if (is_gimple_assign (rhs_def_stmt) | |
1191 | && gimple_assign_rhs_code (rhs_def_stmt) == BIT_AND_EXPR | |
1192 | && has_single_use (gimple_assign_lhs (rhs_def_stmt))) | |
1193 | { | |
1194 | tree rhs_def_operand1 = gimple_assign_rhs1 (rhs_def_stmt); | |
1195 | tree rhs_def_operand2 = gimple_assign_rhs2 (rhs_def_stmt); | |
1196 | tree lhs_type = TREE_TYPE (gimple_assign_lhs (stmt)); | |
1197 | ||
1198 | /* Now verify suitability of the BIT_AND_EXPR's operands. | |
1199 | The first must be an SSA_NAME that we can propagate and the | |
1200 | second must be an integer constant that masks out all the | |
1201 | bits outside the final result's type, but nothing else. */ | |
1202 | if (TREE_CODE (rhs_def_operand1) == SSA_NAME | |
1203 | && ! SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rhs_def_operand1) | |
1204 | && TREE_CODE (rhs_def_operand2) == INTEGER_CST | |
1205 | && operand_equal_p (rhs_def_operand2, | |
1206 | build_low_bits_mask (TREE_TYPE (rhs_def_operand2), | |
1207 | TYPE_PRECISION (lhs_type)), | |
1208 | 0)) | |
1209 | { | |
1210 | /* This is an optimizable case. Replace the source operand | |
1211 | in the conversion with the first source operand of the | |
1212 | BIT_AND_EXPR. */ | |
1213 | gimple_assign_set_rhs1 (stmt, rhs_def_operand1); | |
1214 | stmt = gsi_stmt (*gsi_p); | |
1215 | update_stmt (stmt); | |
1216 | ||
1217 | /* There is no DCE after the last forwprop pass. It's | |
1218 | easy to clean up the first order effects here. */ | |
1219 | gimple_stmt_iterator si; | |
1220 | si = gsi_for_stmt (rhs_def_stmt); | |
1221 | gsi_remove (&si, true); | |
1222 | release_defs (rhs_def_stmt); | |
1223 | return true; | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | return false; | |
1228 | } | |
1229 | ||
1230 | ||
3a938499 | 1231 | /* If we have lhs = ~x (STMT), look and see if earlier we had x = ~y. |
1232 | If so, we can change STMT into lhs = y which can later be copy | |
48e1416a | 1233 | propagated. Similarly for negation. |
3a938499 | 1234 | |
48e1416a | 1235 | This could trivially be formulated as a forward propagation |
3a938499 | 1236 | to immediate uses. However, we already had an implementation |
1237 | from DOM which used backward propagation via the use-def links. | |
1238 | ||
1239 | It turns out that backward propagation is actually faster as | |
1240 | there's less work to do for each NOT/NEG expression we find. | |
1241 | Backwards propagation needs to look at the statement in a single | |
1242 | backlink. Forward propagation needs to look at potentially more | |
678b2f5b | 1243 | than one forward link. |
3a938499 | 1244 | |
678b2f5b | 1245 | Returns true when the statement was changed. */ |
1246 | ||
1247 | static bool | |
75a70cf9 | 1248 | simplify_not_neg_expr (gimple_stmt_iterator *gsi_p) |
3a938499 | 1249 | { |
75a70cf9 | 1250 | gimple stmt = gsi_stmt (*gsi_p); |
1251 | tree rhs = gimple_assign_rhs1 (stmt); | |
1252 | gimple rhs_def_stmt = SSA_NAME_DEF_STMT (rhs); | |
3a938499 | 1253 | |
1254 | /* See if the RHS_DEF_STMT has the same form as our statement. */ | |
75a70cf9 | 1255 | if (is_gimple_assign (rhs_def_stmt) |
1256 | && gimple_assign_rhs_code (rhs_def_stmt) == gimple_assign_rhs_code (stmt)) | |
3a938499 | 1257 | { |
75a70cf9 | 1258 | tree rhs_def_operand = gimple_assign_rhs1 (rhs_def_stmt); |
3a938499 | 1259 | |
1260 | /* Verify that RHS_DEF_OPERAND is a suitable SSA_NAME. */ | |
1261 | if (TREE_CODE (rhs_def_operand) == SSA_NAME | |
1262 | && ! SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rhs_def_operand)) | |
1263 | { | |
75a70cf9 | 1264 | gimple_assign_set_rhs_from_tree (gsi_p, rhs_def_operand); |
1265 | stmt = gsi_stmt (*gsi_p); | |
3a938499 | 1266 | update_stmt (stmt); |
678b2f5b | 1267 | return true; |
3a938499 | 1268 | } |
1269 | } | |
678b2f5b | 1270 | |
1271 | return false; | |
3a938499 | 1272 | } |
3d5cfe81 | 1273 | |
b59e1c90 | 1274 | /* Helper function for simplify_gimple_switch. Remove case labels that |
1275 | have values outside the range of the new type. */ | |
1276 | ||
1277 | static void | |
1278 | simplify_gimple_switch_label_vec (gimple stmt, tree index_type) | |
1279 | { | |
1280 | unsigned int branch_num = gimple_switch_num_labels (stmt); | |
f1f41a6c | 1281 | vec<tree> labels; |
1282 | labels.create (branch_num); | |
b59e1c90 | 1283 | unsigned int i, len; |
1284 | ||
1285 | /* Collect the existing case labels in a VEC, and preprocess it as if | |
1286 | we are gimplifying a GENERIC SWITCH_EXPR. */ | |
1287 | for (i = 1; i < branch_num; i++) | |
f1f41a6c | 1288 | labels.quick_push (gimple_switch_label (stmt, i)); |
b59e1c90 | 1289 | preprocess_case_label_vec_for_gimple (labels, index_type, NULL); |
1290 | ||
1291 | /* If any labels were removed, replace the existing case labels | |
1292 | in the GIMPLE_SWITCH statement with the correct ones. | |
1293 | Note that the type updates were done in-place on the case labels, | |
1294 | so we only have to replace the case labels in the GIMPLE_SWITCH | |
1295 | if the number of labels changed. */ | |
f1f41a6c | 1296 | len = labels.length (); |
b59e1c90 | 1297 | if (len < branch_num - 1) |
1298 | { | |
1299 | bitmap target_blocks; | |
1300 | edge_iterator ei; | |
1301 | edge e; | |
1302 | ||
1303 | /* Corner case: *all* case labels have been removed as being | |
1304 | out-of-range for INDEX_TYPE. Push one label and let the | |
1305 | CFG cleanups deal with this further. */ | |
1306 | if (len == 0) | |
1307 | { | |
1308 | tree label, elt; | |
1309 | ||
1310 | label = CASE_LABEL (gimple_switch_default_label (stmt)); | |
1311 | elt = build_case_label (build_int_cst (index_type, 0), NULL, label); | |
f1f41a6c | 1312 | labels.quick_push (elt); |
b59e1c90 | 1313 | len = 1; |
1314 | } | |
1315 | ||
f1f41a6c | 1316 | for (i = 0; i < labels.length (); i++) |
1317 | gimple_switch_set_label (stmt, i + 1, labels[i]); | |
b59e1c90 | 1318 | for (i++ ; i < branch_num; i++) |
1319 | gimple_switch_set_label (stmt, i, NULL_TREE); | |
1320 | gimple_switch_set_num_labels (stmt, len + 1); | |
1321 | ||
1322 | /* Cleanup any edges that are now dead. */ | |
1323 | target_blocks = BITMAP_ALLOC (NULL); | |
1324 | for (i = 0; i < gimple_switch_num_labels (stmt); i++) | |
1325 | { | |
1326 | tree elt = gimple_switch_label (stmt, i); | |
1327 | basic_block target = label_to_block (CASE_LABEL (elt)); | |
1328 | bitmap_set_bit (target_blocks, target->index); | |
1329 | } | |
1330 | for (ei = ei_start (gimple_bb (stmt)->succs); (e = ei_safe_edge (ei)); ) | |
1331 | { | |
1332 | if (! bitmap_bit_p (target_blocks, e->dest->index)) | |
1333 | { | |
1334 | remove_edge (e); | |
1335 | cfg_changed = true; | |
1336 | free_dominance_info (CDI_DOMINATORS); | |
1337 | } | |
1338 | else | |
1339 | ei_next (&ei); | |
1340 | } | |
1341 | BITMAP_FREE (target_blocks); | |
1342 | } | |
1343 | ||
f1f41a6c | 1344 | labels.release (); |
b59e1c90 | 1345 | } |
1346 | ||
b5860aba | 1347 | /* STMT is a SWITCH_EXPR for which we attempt to find equivalent forms of |
1348 | the condition which we may be able to optimize better. */ | |
1349 | ||
678b2f5b | 1350 | static bool |
75a70cf9 | 1351 | simplify_gimple_switch (gimple stmt) |
b5860aba | 1352 | { |
75a70cf9 | 1353 | tree cond = gimple_switch_index (stmt); |
b5860aba | 1354 | tree def, to, ti; |
75a70cf9 | 1355 | gimple def_stmt; |
b5860aba | 1356 | |
1357 | /* The optimization that we really care about is removing unnecessary | |
1358 | casts. That will let us do much better in propagating the inferred | |
1359 | constant at the switch target. */ | |
1360 | if (TREE_CODE (cond) == SSA_NAME) | |
1361 | { | |
75a70cf9 | 1362 | def_stmt = SSA_NAME_DEF_STMT (cond); |
1363 | if (is_gimple_assign (def_stmt)) | |
b5860aba | 1364 | { |
75a70cf9 | 1365 | if (gimple_assign_rhs_code (def_stmt) == NOP_EXPR) |
b5860aba | 1366 | { |
1367 | int need_precision; | |
1368 | bool fail; | |
1369 | ||
75a70cf9 | 1370 | def = gimple_assign_rhs1 (def_stmt); |
b5860aba | 1371 | |
b5860aba | 1372 | to = TREE_TYPE (cond); |
1373 | ti = TREE_TYPE (def); | |
1374 | ||
1375 | /* If we have an extension that preserves value, then we | |
1376 | can copy the source value into the switch. */ | |
1377 | ||
1378 | need_precision = TYPE_PRECISION (ti); | |
1379 | fail = false; | |
c5237b8b | 1380 | if (! INTEGRAL_TYPE_P (ti)) |
1381 | fail = true; | |
1382 | else if (TYPE_UNSIGNED (to) && !TYPE_UNSIGNED (ti)) | |
b5860aba | 1383 | fail = true; |
1384 | else if (!TYPE_UNSIGNED (to) && TYPE_UNSIGNED (ti)) | |
1385 | need_precision += 1; | |
1386 | if (TYPE_PRECISION (to) < need_precision) | |
1387 | fail = true; | |
1388 | ||
1389 | if (!fail) | |
1390 | { | |
75a70cf9 | 1391 | gimple_switch_set_index (stmt, def); |
b59e1c90 | 1392 | simplify_gimple_switch_label_vec (stmt, ti); |
b5860aba | 1393 | update_stmt (stmt); |
678b2f5b | 1394 | return true; |
b5860aba | 1395 | } |
1396 | } | |
1397 | } | |
1398 | } | |
678b2f5b | 1399 | |
1400 | return false; | |
b5860aba | 1401 | } |
1402 | ||
27f931ff | 1403 | /* For pointers p2 and p1 return p2 - p1 if the |
1404 | difference is known and constant, otherwise return NULL. */ | |
1405 | ||
1406 | static tree | |
1407 | constant_pointer_difference (tree p1, tree p2) | |
1408 | { | |
1409 | int i, j; | |
1410 | #define CPD_ITERATIONS 5 | |
1411 | tree exps[2][CPD_ITERATIONS]; | |
1412 | tree offs[2][CPD_ITERATIONS]; | |
1413 | int cnt[2]; | |
1414 | ||
1415 | for (i = 0; i < 2; i++) | |
1416 | { | |
1417 | tree p = i ? p1 : p2; | |
1418 | tree off = size_zero_node; | |
1419 | gimple stmt; | |
1420 | enum tree_code code; | |
1421 | ||
1422 | /* For each of p1 and p2 we need to iterate at least | |
1423 | twice, to handle ADDR_EXPR directly in p1/p2, | |
1424 | SSA_NAME with ADDR_EXPR or POINTER_PLUS_EXPR etc. | |
1425 | on definition's stmt RHS. Iterate a few extra times. */ | |
1426 | j = 0; | |
1427 | do | |
1428 | { | |
1429 | if (!POINTER_TYPE_P (TREE_TYPE (p))) | |
1430 | break; | |
1431 | if (TREE_CODE (p) == ADDR_EXPR) | |
1432 | { | |
1433 | tree q = TREE_OPERAND (p, 0); | |
1434 | HOST_WIDE_INT offset; | |
1435 | tree base = get_addr_base_and_unit_offset (q, &offset); | |
1436 | if (base) | |
1437 | { | |
1438 | q = base; | |
1439 | if (offset) | |
1440 | off = size_binop (PLUS_EXPR, off, size_int (offset)); | |
1441 | } | |
1442 | if (TREE_CODE (q) == MEM_REF | |
1443 | && TREE_CODE (TREE_OPERAND (q, 0)) == SSA_NAME) | |
1444 | { | |
1445 | p = TREE_OPERAND (q, 0); | |
1446 | off = size_binop (PLUS_EXPR, off, | |
e913b5cd | 1447 | wide_int_to_tree (sizetype, |
1448 | mem_ref_offset (q))); | |
27f931ff | 1449 | } |
1450 | else | |
1451 | { | |
1452 | exps[i][j] = q; | |
1453 | offs[i][j++] = off; | |
1454 | break; | |
1455 | } | |
1456 | } | |
1457 | if (TREE_CODE (p) != SSA_NAME) | |
1458 | break; | |
1459 | exps[i][j] = p; | |
1460 | offs[i][j++] = off; | |
1461 | if (j == CPD_ITERATIONS) | |
1462 | break; | |
1463 | stmt = SSA_NAME_DEF_STMT (p); | |
1464 | if (!is_gimple_assign (stmt) || gimple_assign_lhs (stmt) != p) | |
1465 | break; | |
1466 | code = gimple_assign_rhs_code (stmt); | |
1467 | if (code == POINTER_PLUS_EXPR) | |
1468 | { | |
1469 | if (TREE_CODE (gimple_assign_rhs2 (stmt)) != INTEGER_CST) | |
1470 | break; | |
1471 | off = size_binop (PLUS_EXPR, off, gimple_assign_rhs2 (stmt)); | |
1472 | p = gimple_assign_rhs1 (stmt); | |
1473 | } | |
1474 | else if (code == ADDR_EXPR || code == NOP_EXPR) | |
1475 | p = gimple_assign_rhs1 (stmt); | |
1476 | else | |
1477 | break; | |
1478 | } | |
1479 | while (1); | |
1480 | cnt[i] = j; | |
1481 | } | |
1482 | ||
1483 | for (i = 0; i < cnt[0]; i++) | |
1484 | for (j = 0; j < cnt[1]; j++) | |
1485 | if (exps[0][i] == exps[1][j]) | |
1486 | return size_binop (MINUS_EXPR, offs[0][i], offs[1][j]); | |
1487 | ||
1488 | return NULL_TREE; | |
1489 | } | |
1490 | ||
1491 | /* *GSI_P is a GIMPLE_CALL to a builtin function. | |
1492 | Optimize | |
1493 | memcpy (p, "abcd", 4); | |
1494 | memset (p + 4, ' ', 3); | |
1495 | into | |
1496 | memcpy (p, "abcd ", 7); | |
1497 | call if the latter can be stored by pieces during expansion. */ | |
1498 | ||
1499 | static bool | |
1500 | simplify_builtin_call (gimple_stmt_iterator *gsi_p, tree callee2) | |
1501 | { | |
1502 | gimple stmt1, stmt2 = gsi_stmt (*gsi_p); | |
1503 | tree vuse = gimple_vuse (stmt2); | |
1504 | if (vuse == NULL) | |
1505 | return false; | |
1506 | stmt1 = SSA_NAME_DEF_STMT (vuse); | |
1507 | ||
1508 | switch (DECL_FUNCTION_CODE (callee2)) | |
1509 | { | |
1510 | case BUILT_IN_MEMSET: | |
1511 | if (gimple_call_num_args (stmt2) != 3 | |
1512 | || gimple_call_lhs (stmt2) | |
1513 | || CHAR_BIT != 8 | |
1514 | || BITS_PER_UNIT != 8) | |
1515 | break; | |
1516 | else | |
1517 | { | |
1518 | tree callee1; | |
1519 | tree ptr1, src1, str1, off1, len1, lhs1; | |
1520 | tree ptr2 = gimple_call_arg (stmt2, 0); | |
1521 | tree val2 = gimple_call_arg (stmt2, 1); | |
1522 | tree len2 = gimple_call_arg (stmt2, 2); | |
1523 | tree diff, vdef, new_str_cst; | |
1524 | gimple use_stmt; | |
1525 | unsigned int ptr1_align; | |
1526 | unsigned HOST_WIDE_INT src_len; | |
1527 | char *src_buf; | |
1528 | use_operand_p use_p; | |
1529 | ||
e913b5cd | 1530 | if (!tree_fits_shwi_p (val2) |
1531 | || !tree_fits_uhwi_p (len2)) | |
27f931ff | 1532 | break; |
1533 | if (is_gimple_call (stmt1)) | |
1534 | { | |
1535 | /* If first stmt is a call, it needs to be memcpy | |
1536 | or mempcpy, with string literal as second argument and | |
1537 | constant length. */ | |
1538 | callee1 = gimple_call_fndecl (stmt1); | |
1539 | if (callee1 == NULL_TREE | |
1540 | || DECL_BUILT_IN_CLASS (callee1) != BUILT_IN_NORMAL | |
1541 | || gimple_call_num_args (stmt1) != 3) | |
1542 | break; | |
1543 | if (DECL_FUNCTION_CODE (callee1) != BUILT_IN_MEMCPY | |
1544 | && DECL_FUNCTION_CODE (callee1) != BUILT_IN_MEMPCPY) | |
1545 | break; | |
1546 | ptr1 = gimple_call_arg (stmt1, 0); | |
1547 | src1 = gimple_call_arg (stmt1, 1); | |
1548 | len1 = gimple_call_arg (stmt1, 2); | |
1549 | lhs1 = gimple_call_lhs (stmt1); | |
e913b5cd | 1550 | if (!tree_fits_uhwi_p (len1)) |
27f931ff | 1551 | break; |
1552 | str1 = string_constant (src1, &off1); | |
1553 | if (str1 == NULL_TREE) | |
1554 | break; | |
e913b5cd | 1555 | if (!tree_fits_uhwi_p (off1) |
27f931ff | 1556 | || compare_tree_int (off1, TREE_STRING_LENGTH (str1) - 1) > 0 |
1557 | || compare_tree_int (len1, TREE_STRING_LENGTH (str1) | |
e913b5cd | 1558 | - tree_to_uhwi (off1)) > 0 |
27f931ff | 1559 | || TREE_CODE (TREE_TYPE (str1)) != ARRAY_TYPE |
1560 | || TYPE_MODE (TREE_TYPE (TREE_TYPE (str1))) | |
1561 | != TYPE_MODE (char_type_node)) | |
1562 | break; | |
1563 | } | |
1564 | else if (gimple_assign_single_p (stmt1)) | |
1565 | { | |
1566 | /* Otherwise look for length 1 memcpy optimized into | |
1567 | assignment. */ | |
1568 | ptr1 = gimple_assign_lhs (stmt1); | |
1569 | src1 = gimple_assign_rhs1 (stmt1); | |
1570 | if (TREE_CODE (ptr1) != MEM_REF | |
1571 | || TYPE_MODE (TREE_TYPE (ptr1)) != TYPE_MODE (char_type_node) | |
e913b5cd | 1572 | || !tree_fits_shwi_p (src1)) |
27f931ff | 1573 | break; |
1574 | ptr1 = build_fold_addr_expr (ptr1); | |
1575 | callee1 = NULL_TREE; | |
1576 | len1 = size_one_node; | |
1577 | lhs1 = NULL_TREE; | |
1578 | off1 = size_zero_node; | |
1579 | str1 = NULL_TREE; | |
1580 | } | |
1581 | else | |
1582 | break; | |
1583 | ||
1584 | diff = constant_pointer_difference (ptr1, ptr2); | |
1585 | if (diff == NULL && lhs1 != NULL) | |
1586 | { | |
1587 | diff = constant_pointer_difference (lhs1, ptr2); | |
1588 | if (DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY | |
1589 | && diff != NULL) | |
1590 | diff = size_binop (PLUS_EXPR, diff, | |
1591 | fold_convert (sizetype, len1)); | |
1592 | } | |
1593 | /* If the difference between the second and first destination pointer | |
1594 | is not constant, or is bigger than memcpy length, bail out. */ | |
1595 | if (diff == NULL | |
e913b5cd | 1596 | || !tree_fits_uhwi_p (diff) |
27f931ff | 1597 | || tree_int_cst_lt (len1, diff)) |
1598 | break; | |
1599 | ||
1600 | /* Use maximum of difference plus memset length and memcpy length | |
1601 | as the new memcpy length, if it is too big, bail out. */ | |
e913b5cd | 1602 | src_len = tree_to_uhwi (diff); |
1603 | src_len += tree_to_uhwi (len2); | |
aa59f000 | 1604 | if (src_len < tree_to_uhwi (len1)) |
e913b5cd | 1605 | src_len = tree_to_uhwi (len1); |
27f931ff | 1606 | if (src_len > 1024) |
1607 | break; | |
1608 | ||
1609 | /* If mempcpy value is used elsewhere, bail out, as mempcpy | |
1610 | with bigger length will return different result. */ | |
1611 | if (lhs1 != NULL_TREE | |
1612 | && DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY | |
1613 | && (TREE_CODE (lhs1) != SSA_NAME | |
1614 | || !single_imm_use (lhs1, &use_p, &use_stmt) | |
1615 | || use_stmt != stmt2)) | |
1616 | break; | |
1617 | ||
1618 | /* If anything reads memory in between memcpy and memset | |
1619 | call, the modified memcpy call might change it. */ | |
1620 | vdef = gimple_vdef (stmt1); | |
1621 | if (vdef != NULL | |
1622 | && (!single_imm_use (vdef, &use_p, &use_stmt) | |
1623 | || use_stmt != stmt2)) | |
1624 | break; | |
1625 | ||
957d0361 | 1626 | ptr1_align = get_pointer_alignment (ptr1); |
27f931ff | 1627 | /* Construct the new source string literal. */ |
1628 | src_buf = XALLOCAVEC (char, src_len + 1); | |
1629 | if (callee1) | |
1630 | memcpy (src_buf, | |
e913b5cd | 1631 | TREE_STRING_POINTER (str1) + tree_to_uhwi (off1), |
1632 | tree_to_uhwi (len1)); | |
27f931ff | 1633 | else |
e913b5cd | 1634 | src_buf[0] = tree_to_shwi (src1); |
1635 | memset (src_buf + tree_to_uhwi (diff), | |
1636 | tree_to_shwi (val2), tree_to_uhwi (len2)); | |
27f931ff | 1637 | src_buf[src_len] = '\0'; |
1638 | /* Neither builtin_strncpy_read_str nor builtin_memcpy_read_str | |
1639 | handle embedded '\0's. */ | |
1640 | if (strlen (src_buf) != src_len) | |
1641 | break; | |
1642 | rtl_profile_for_bb (gimple_bb (stmt2)); | |
1643 | /* If the new memcpy wouldn't be emitted by storing the literal | |
1644 | by pieces, this optimization might enlarge .rodata too much, | |
1645 | as commonly used string literals couldn't be shared any | |
1646 | longer. */ | |
1647 | if (!can_store_by_pieces (src_len, | |
1648 | builtin_strncpy_read_str, | |
1649 | src_buf, ptr1_align, false)) | |
1650 | break; | |
1651 | ||
1652 | new_str_cst = build_string_literal (src_len, src_buf); | |
1653 | if (callee1) | |
1654 | { | |
1655 | /* If STMT1 is a mem{,p}cpy call, adjust it and remove | |
1656 | memset call. */ | |
1657 | if (lhs1 && DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY) | |
1658 | gimple_call_set_lhs (stmt1, NULL_TREE); | |
1659 | gimple_call_set_arg (stmt1, 1, new_str_cst); | |
1660 | gimple_call_set_arg (stmt1, 2, | |
1661 | build_int_cst (TREE_TYPE (len1), src_len)); | |
1662 | update_stmt (stmt1); | |
1663 | unlink_stmt_vdef (stmt2); | |
1664 | gsi_remove (gsi_p, true); | |
1665 | release_defs (stmt2); | |
1666 | if (lhs1 && DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY) | |
1667 | release_ssa_name (lhs1); | |
1668 | return true; | |
1669 | } | |
1670 | else | |
1671 | { | |
1672 | /* Otherwise, if STMT1 is length 1 memcpy optimized into | |
1673 | assignment, remove STMT1 and change memset call into | |
1674 | memcpy call. */ | |
1675 | gimple_stmt_iterator gsi = gsi_for_stmt (stmt1); | |
1676 | ||
7ecb2e7c | 1677 | if (!is_gimple_val (ptr1)) |
1678 | ptr1 = force_gimple_operand_gsi (gsi_p, ptr1, true, NULL_TREE, | |
1679 | true, GSI_SAME_STMT); | |
b9a16870 | 1680 | gimple_call_set_fndecl (stmt2, |
1681 | builtin_decl_explicit (BUILT_IN_MEMCPY)); | |
27f931ff | 1682 | gimple_call_set_arg (stmt2, 0, ptr1); |
1683 | gimple_call_set_arg (stmt2, 1, new_str_cst); | |
1684 | gimple_call_set_arg (stmt2, 2, | |
1685 | build_int_cst (TREE_TYPE (len2), src_len)); | |
1686 | unlink_stmt_vdef (stmt1); | |
1687 | gsi_remove (&gsi, true); | |
1688 | release_defs (stmt1); | |
1689 | update_stmt (stmt2); | |
1690 | return false; | |
1691 | } | |
1692 | } | |
1693 | break; | |
1694 | default: | |
1695 | break; | |
1696 | } | |
1697 | return false; | |
1698 | } | |
1699 | ||
41913fa9 | 1700 | /* Checks if expression has type of one-bit precision, or is a known |
1701 | truth-valued expression. */ | |
1702 | static bool | |
1703 | truth_valued_ssa_name (tree name) | |
1704 | { | |
1705 | gimple def; | |
1706 | tree type = TREE_TYPE (name); | |
1707 | ||
1708 | if (!INTEGRAL_TYPE_P (type)) | |
1709 | return false; | |
1710 | /* Don't check here for BOOLEAN_TYPE as the precision isn't | |
1711 | necessarily one and so ~X is not equal to !X. */ | |
1712 | if (TYPE_PRECISION (type) == 1) | |
1713 | return true; | |
1714 | def = SSA_NAME_DEF_STMT (name); | |
1715 | if (is_gimple_assign (def)) | |
1716 | return truth_value_p (gimple_assign_rhs_code (def)); | |
1717 | return false; | |
1718 | } | |
1719 | ||
1720 | /* Helper routine for simplify_bitwise_binary_1 function. | |
1721 | Return for the SSA name NAME the expression X if it mets condition | |
1722 | NAME = !X. Otherwise return NULL_TREE. | |
1723 | Detected patterns for NAME = !X are: | |
1724 | !X and X == 0 for X with integral type. | |
1725 | X ^ 1, X != 1,or ~X for X with integral type with precision of one. */ | |
1726 | static tree | |
1727 | lookup_logical_inverted_value (tree name) | |
1728 | { | |
1729 | tree op1, op2; | |
1730 | enum tree_code code; | |
1731 | gimple def; | |
1732 | ||
1733 | /* If name has none-intergal type, or isn't a SSA_NAME, then | |
1734 | return. */ | |
1735 | if (TREE_CODE (name) != SSA_NAME | |
1736 | || !INTEGRAL_TYPE_P (TREE_TYPE (name))) | |
1737 | return NULL_TREE; | |
1738 | def = SSA_NAME_DEF_STMT (name); | |
1739 | if (!is_gimple_assign (def)) | |
1740 | return NULL_TREE; | |
1741 | ||
1742 | code = gimple_assign_rhs_code (def); | |
1743 | op1 = gimple_assign_rhs1 (def); | |
1744 | op2 = NULL_TREE; | |
1745 | ||
1746 | /* Get for EQ_EXPR or BIT_XOR_EXPR operation the second operand. | |
8f4a7578 | 1747 | If CODE isn't an EQ_EXPR, BIT_XOR_EXPR, or BIT_NOT_EXPR, then return. */ |
41913fa9 | 1748 | if (code == EQ_EXPR || code == NE_EXPR |
1749 | || code == BIT_XOR_EXPR) | |
1750 | op2 = gimple_assign_rhs2 (def); | |
1751 | ||
1752 | switch (code) | |
1753 | { | |
41913fa9 | 1754 | case BIT_NOT_EXPR: |
1755 | if (truth_valued_ssa_name (name)) | |
1756 | return op1; | |
1757 | break; | |
1758 | case EQ_EXPR: | |
1759 | /* Check if we have X == 0 and X has an integral type. */ | |
1760 | if (!INTEGRAL_TYPE_P (TREE_TYPE (op1))) | |
1761 | break; | |
1762 | if (integer_zerop (op2)) | |
1763 | return op1; | |
1764 | break; | |
1765 | case NE_EXPR: | |
1766 | /* Check if we have X != 1 and X is a truth-valued. */ | |
1767 | if (!INTEGRAL_TYPE_P (TREE_TYPE (op1))) | |
1768 | break; | |
1769 | if (integer_onep (op2) && truth_valued_ssa_name (op1)) | |
1770 | return op1; | |
1771 | break; | |
1772 | case BIT_XOR_EXPR: | |
1773 | /* Check if we have X ^ 1 and X is truth valued. */ | |
1774 | if (integer_onep (op2) && truth_valued_ssa_name (op1)) | |
1775 | return op1; | |
1776 | break; | |
1777 | default: | |
1778 | break; | |
1779 | } | |
1780 | ||
1781 | return NULL_TREE; | |
1782 | } | |
1783 | ||
1784 | /* Optimize ARG1 CODE ARG2 to a constant for bitwise binary | |
1785 | operations CODE, if one operand has the logically inverted | |
1786 | value of the other. */ | |
1787 | static tree | |
1788 | simplify_bitwise_binary_1 (enum tree_code code, tree type, | |
1789 | tree arg1, tree arg2) | |
1790 | { | |
1791 | tree anot; | |
1792 | ||
1793 | /* If CODE isn't a bitwise binary operation, return NULL_TREE. */ | |
1794 | if (code != BIT_AND_EXPR && code != BIT_IOR_EXPR | |
1795 | && code != BIT_XOR_EXPR) | |
1796 | return NULL_TREE; | |
1797 | ||
1798 | /* First check if operands ARG1 and ARG2 are equal. If so | |
1799 | return NULL_TREE as this optimization is handled fold_stmt. */ | |
1800 | if (arg1 == arg2) | |
1801 | return NULL_TREE; | |
1802 | /* See if we have in arguments logical-not patterns. */ | |
1803 | if (((anot = lookup_logical_inverted_value (arg1)) == NULL_TREE | |
1804 | || anot != arg2) | |
1805 | && ((anot = lookup_logical_inverted_value (arg2)) == NULL_TREE | |
1806 | || anot != arg1)) | |
1807 | return NULL_TREE; | |
1808 | ||
1809 | /* X & !X -> 0. */ | |
1810 | if (code == BIT_AND_EXPR) | |
1811 | return fold_convert (type, integer_zero_node); | |
1812 | /* X | !X -> 1 and X ^ !X -> 1, if X is truth-valued. */ | |
1813 | if (truth_valued_ssa_name (anot)) | |
1814 | return fold_convert (type, integer_one_node); | |
1815 | ||
1816 | /* ??? Otherwise result is (X != 0 ? X : 1). not handled. */ | |
1817 | return NULL_TREE; | |
1818 | } | |
1819 | ||
10fbe63d | 1820 | /* Given a ssa_name in NAME see if it was defined by an assignment and |
1821 | set CODE to be the code and ARG1 to the first operand on the rhs and ARG2 | |
1822 | to the second operand on the rhs. */ | |
1823 | ||
1824 | static inline void | |
1825 | defcodefor_name (tree name, enum tree_code *code, tree *arg1, tree *arg2) | |
1826 | { | |
1827 | gimple def; | |
1828 | enum tree_code code1; | |
1829 | tree arg11; | |
1830 | tree arg21; | |
1831 | tree arg31; | |
1832 | enum gimple_rhs_class grhs_class; | |
1833 | ||
1834 | code1 = TREE_CODE (name); | |
1835 | arg11 = name; | |
1836 | arg21 = NULL_TREE; | |
1837 | grhs_class = get_gimple_rhs_class (code1); | |
1838 | ||
1839 | if (code1 == SSA_NAME) | |
1840 | { | |
1841 | def = SSA_NAME_DEF_STMT (name); | |
1842 | ||
1843 | if (def && is_gimple_assign (def) | |
1844 | && can_propagate_from (def)) | |
1845 | { | |
1846 | code1 = gimple_assign_rhs_code (def); | |
1847 | arg11 = gimple_assign_rhs1 (def); | |
1848 | arg21 = gimple_assign_rhs2 (def); | |
1849 | arg31 = gimple_assign_rhs2 (def); | |
1850 | } | |
1851 | } | |
1852 | else if (grhs_class == GIMPLE_TERNARY_RHS | |
1853 | || GIMPLE_BINARY_RHS | |
1854 | || GIMPLE_UNARY_RHS | |
1855 | || GIMPLE_SINGLE_RHS) | |
1856 | extract_ops_from_tree_1 (name, &code1, &arg11, &arg21, &arg31); | |
1857 | ||
1858 | *code = code1; | |
1859 | *arg1 = arg11; | |
1860 | if (arg2) | |
1861 | *arg2 = arg21; | |
1862 | /* Ignore arg3 currently. */ | |
1863 | } | |
1864 | ||
750e47f5 | 1865 | /* Return true if a conversion of an operand from type FROM to type TO |
1866 | should be applied after performing the operation instead. */ | |
1867 | ||
1868 | static bool | |
1869 | hoist_conversion_for_bitop_p (tree to, tree from) | |
1870 | { | |
1871 | /* That's a good idea if the conversion widens the operand, thus | |
1872 | after hoisting the conversion the operation will be narrower. */ | |
1873 | if (TYPE_PRECISION (from) < TYPE_PRECISION (to)) | |
1874 | return true; | |
1875 | ||
1876 | /* It's also a good idea if the conversion is to a non-integer mode. */ | |
1877 | if (GET_MODE_CLASS (TYPE_MODE (to)) != MODE_INT) | |
1878 | return true; | |
1879 | ||
1880 | /* Or if the precision of TO is not the same as the precision | |
1881 | of its mode. */ | |
1882 | if (TYPE_PRECISION (to) != GET_MODE_PRECISION (TYPE_MODE (to))) | |
1883 | return true; | |
1884 | ||
1885 | return false; | |
1886 | } | |
1887 | ||
16bc66ec | 1888 | /* GSI points to a statement of the form |
1889 | ||
1890 | result = OP0 CODE OP1 | |
1891 | ||
1892 | Where OP0 and OP1 are single bit SSA_NAMEs and CODE is either | |
1893 | BIT_AND_EXPR or BIT_IOR_EXPR. | |
1894 | ||
1895 | If OP0 is fed by a bitwise negation of another single bit SSA_NAME, | |
1896 | then we can simplify the two statements into a single LT_EXPR or LE_EXPR | |
1897 | when code is BIT_AND_EXPR and BIT_IOR_EXPR respectively. | |
1898 | ||
040f64e5 | 1899 | If a simplification is made, return TRUE, else return FALSE. */ |
16bc66ec | 1900 | static bool |
1901 | simplify_bitwise_binary_boolean (gimple_stmt_iterator *gsi, | |
1902 | enum tree_code code, | |
1903 | tree op0, tree op1) | |
1904 | { | |
1905 | gimple op0_def_stmt = SSA_NAME_DEF_STMT (op0); | |
1906 | ||
1907 | if (!is_gimple_assign (op0_def_stmt) | |
1908 | || (gimple_assign_rhs_code (op0_def_stmt) != BIT_NOT_EXPR)) | |
1909 | return false; | |
1910 | ||
1911 | tree x = gimple_assign_rhs1 (op0_def_stmt); | |
1912 | if (TREE_CODE (x) == SSA_NAME | |
1913 | && INTEGRAL_TYPE_P (TREE_TYPE (x)) | |
1914 | && TYPE_PRECISION (TREE_TYPE (x)) == 1 | |
1915 | && TYPE_UNSIGNED (TREE_TYPE (x)) == TYPE_UNSIGNED (TREE_TYPE (op1))) | |
1916 | { | |
1917 | enum tree_code newcode; | |
1918 | ||
1919 | gimple stmt = gsi_stmt (*gsi); | |
1920 | gimple_assign_set_rhs1 (stmt, x); | |
1921 | gimple_assign_set_rhs2 (stmt, op1); | |
1922 | if (code == BIT_AND_EXPR) | |
1923 | newcode = TYPE_UNSIGNED (TREE_TYPE (x)) ? LT_EXPR : GT_EXPR; | |
1924 | else | |
1925 | newcode = TYPE_UNSIGNED (TREE_TYPE (x)) ? LE_EXPR : GE_EXPR; | |
1926 | gimple_assign_set_rhs_code (stmt, newcode); | |
1927 | update_stmt (stmt); | |
1928 | return true; | |
1929 | } | |
1930 | return false; | |
1931 | ||
1932 | } | |
1933 | ||
300da094 | 1934 | /* Simplify bitwise binary operations. |
1935 | Return true if a transformation applied, otherwise return false. */ | |
1c4607fd | 1936 | |
300da094 | 1937 | static bool |
1938 | simplify_bitwise_binary (gimple_stmt_iterator *gsi) | |
1c4607fd | 1939 | { |
300da094 | 1940 | gimple stmt = gsi_stmt (*gsi); |
1c4607fd | 1941 | tree arg1 = gimple_assign_rhs1 (stmt); |
1942 | tree arg2 = gimple_assign_rhs2 (stmt); | |
300da094 | 1943 | enum tree_code code = gimple_assign_rhs_code (stmt); |
1944 | tree res; | |
10fbe63d | 1945 | tree def1_arg1, def1_arg2, def2_arg1, def2_arg2; |
26f54bd0 | 1946 | enum tree_code def1_code, def2_code; |
1c4607fd | 1947 | |
10fbe63d | 1948 | defcodefor_name (arg1, &def1_code, &def1_arg1, &def1_arg2); |
1949 | defcodefor_name (arg2, &def2_code, &def2_arg1, &def2_arg2); | |
26f54bd0 | 1950 | |
750e47f5 | 1951 | /* Try to fold (type) X op CST -> (type) (X op ((type-x) CST)) |
1952 | when profitable. */ | |
25ce0d90 | 1953 | if (TREE_CODE (arg2) == INTEGER_CST |
1954 | && CONVERT_EXPR_CODE_P (def1_code) | |
750e47f5 | 1955 | && hoist_conversion_for_bitop_p (TREE_TYPE (arg1), TREE_TYPE (def1_arg1)) |
105fc895 | 1956 | && INTEGRAL_TYPE_P (TREE_TYPE (def1_arg1)) |
25ce0d90 | 1957 | && int_fits_type_p (arg2, TREE_TYPE (def1_arg1))) |
1958 | { | |
1959 | gimple newop; | |
03d37e4e | 1960 | tree tem = make_ssa_name (TREE_TYPE (def1_arg1), NULL); |
25ce0d90 | 1961 | newop = |
1962 | gimple_build_assign_with_ops (code, tem, def1_arg1, | |
1963 | fold_convert_loc (gimple_location (stmt), | |
1964 | TREE_TYPE (def1_arg1), | |
1965 | arg2)); | |
4b5f1658 | 1966 | gimple_set_location (newop, gimple_location (stmt)); |
25ce0d90 | 1967 | gsi_insert_before (gsi, newop, GSI_SAME_STMT); |
1968 | gimple_assign_set_rhs_with_ops_1 (gsi, NOP_EXPR, | |
1969 | tem, NULL_TREE, NULL_TREE); | |
1970 | update_stmt (gsi_stmt (*gsi)); | |
1971 | return true; | |
1972 | } | |
1973 | ||
300da094 | 1974 | /* For bitwise binary operations apply operand conversions to the |
1975 | binary operation result instead of to the operands. This allows | |
1976 | to combine successive conversions and bitwise binary operations. */ | |
26f54bd0 | 1977 | if (CONVERT_EXPR_CODE_P (def1_code) |
1978 | && CONVERT_EXPR_CODE_P (def2_code) | |
1979 | && types_compatible_p (TREE_TYPE (def1_arg1), TREE_TYPE (def2_arg1)) | |
750e47f5 | 1980 | && hoist_conversion_for_bitop_p (TREE_TYPE (arg1), TREE_TYPE (def1_arg1))) |
1c4607fd | 1981 | { |
26f54bd0 | 1982 | gimple newop; |
03d37e4e | 1983 | tree tem = make_ssa_name (TREE_TYPE (def1_arg1), NULL); |
26f54bd0 | 1984 | newop = gimple_build_assign_with_ops (code, tem, def1_arg1, def2_arg1); |
4b5f1658 | 1985 | gimple_set_location (newop, gimple_location (stmt)); |
26f54bd0 | 1986 | gsi_insert_before (gsi, newop, GSI_SAME_STMT); |
1987 | gimple_assign_set_rhs_with_ops_1 (gsi, NOP_EXPR, | |
1988 | tem, NULL_TREE, NULL_TREE); | |
1989 | update_stmt (gsi_stmt (*gsi)); | |
1990 | return true; | |
1991 | } | |
1992 | ||
35967c0f | 1993 | |
1994 | /* Simplify (A & B) OP0 (C & B) to (A OP0 C) & B. */ | |
1995 | if (def1_code == def2_code | |
1996 | && def1_code == BIT_AND_EXPR | |
0a3f7203 | 1997 | && operand_equal_for_phi_arg_p (def1_arg2, |
1998 | def2_arg2)) | |
35967c0f | 1999 | { |
0a3f7203 | 2000 | tree b = def1_arg2; |
35967c0f | 2001 | tree a = def1_arg1; |
2002 | tree c = def2_arg1; | |
2003 | tree inner = fold_build2 (code, TREE_TYPE (arg2), a, c); | |
2004 | /* If A OP0 C (this usually means C is the same as A) is 0 | |
2005 | then fold it down correctly. */ | |
2006 | if (integer_zerop (inner)) | |
2007 | { | |
2008 | gimple_assign_set_rhs_from_tree (gsi, inner); | |
2009 | update_stmt (stmt); | |
2010 | return true; | |
2011 | } | |
2012 | /* If A OP0 C (this usually means C is the same as A) is a ssa_name | |
2013 | then fold it down correctly. */ | |
2014 | else if (TREE_CODE (inner) == SSA_NAME) | |
2015 | { | |
2016 | tree outer = fold_build2 (def1_code, TREE_TYPE (inner), | |
2017 | inner, b); | |
2018 | gimple_assign_set_rhs_from_tree (gsi, outer); | |
2019 | update_stmt (stmt); | |
2020 | return true; | |
2021 | } | |
2022 | else | |
2023 | { | |
2024 | gimple newop; | |
2025 | tree tem; | |
03d37e4e | 2026 | tem = make_ssa_name (TREE_TYPE (arg2), NULL); |
35967c0f | 2027 | newop = gimple_build_assign_with_ops (code, tem, a, c); |
35967c0f | 2028 | gimple_set_location (newop, gimple_location (stmt)); |
2029 | /* Make sure to re-process the new stmt as it's walking upwards. */ | |
2030 | gsi_insert_before (gsi, newop, GSI_NEW_STMT); | |
2031 | gimple_assign_set_rhs1 (stmt, tem); | |
2032 | gimple_assign_set_rhs2 (stmt, b); | |
2033 | gimple_assign_set_rhs_code (stmt, def1_code); | |
2034 | update_stmt (stmt); | |
2035 | return true; | |
2036 | } | |
2037 | } | |
2038 | ||
26f54bd0 | 2039 | /* (a | CST1) & CST2 -> (a & CST2) | (CST1 & CST2). */ |
2040 | if (code == BIT_AND_EXPR | |
2041 | && def1_code == BIT_IOR_EXPR | |
2c83a45e | 2042 | && CONSTANT_CLASS_P (arg2) |
2043 | && CONSTANT_CLASS_P (def1_arg2)) | |
26f54bd0 | 2044 | { |
2045 | tree cst = fold_build2 (BIT_AND_EXPR, TREE_TYPE (arg2), | |
10fbe63d | 2046 | arg2, def1_arg2); |
26f54bd0 | 2047 | tree tem; |
2048 | gimple newop; | |
2049 | if (integer_zerop (cst)) | |
300da094 | 2050 | { |
26f54bd0 | 2051 | gimple_assign_set_rhs1 (stmt, def1_arg1); |
2052 | update_stmt (stmt); | |
2053 | return true; | |
300da094 | 2054 | } |
03d37e4e | 2055 | tem = make_ssa_name (TREE_TYPE (arg2), NULL); |
26f54bd0 | 2056 | newop = gimple_build_assign_with_ops (BIT_AND_EXPR, |
2057 | tem, def1_arg1, arg2); | |
4b5f1658 | 2058 | gimple_set_location (newop, gimple_location (stmt)); |
26f54bd0 | 2059 | /* Make sure to re-process the new stmt as it's walking upwards. */ |
2060 | gsi_insert_before (gsi, newop, GSI_NEW_STMT); | |
2061 | gimple_assign_set_rhs1 (stmt, tem); | |
2062 | gimple_assign_set_rhs2 (stmt, cst); | |
2063 | gimple_assign_set_rhs_code (stmt, BIT_IOR_EXPR); | |
2064 | update_stmt (stmt); | |
2065 | return true; | |
2066 | } | |
2067 | ||
2068 | /* Combine successive equal operations with constants. */ | |
2069 | if ((code == BIT_AND_EXPR | |
2070 | || code == BIT_IOR_EXPR | |
2071 | || code == BIT_XOR_EXPR) | |
2072 | && def1_code == code | |
2c83a45e | 2073 | && CONSTANT_CLASS_P (arg2) |
2074 | && CONSTANT_CLASS_P (def1_arg2)) | |
26f54bd0 | 2075 | { |
2076 | tree cst = fold_build2 (code, TREE_TYPE (arg2), | |
10fbe63d | 2077 | arg2, def1_arg2); |
26f54bd0 | 2078 | gimple_assign_set_rhs1 (stmt, def1_arg1); |
2079 | gimple_assign_set_rhs2 (stmt, cst); | |
2080 | update_stmt (stmt); | |
2081 | return true; | |
1c4607fd | 2082 | } |
300da094 | 2083 | |
8a5f403f | 2084 | /* Canonicalize X ^ ~0 to ~X. */ |
2085 | if (code == BIT_XOR_EXPR | |
8a5f403f | 2086 | && integer_all_onesp (arg2)) |
2087 | { | |
2088 | gimple_assign_set_rhs_with_ops (gsi, BIT_NOT_EXPR, arg1, NULL_TREE); | |
2089 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
2090 | update_stmt (stmt); | |
2091 | return true; | |
2092 | } | |
2093 | ||
41913fa9 | 2094 | /* Try simple folding for X op !X, and X op X. */ |
2095 | res = simplify_bitwise_binary_1 (code, TREE_TYPE (arg1), arg1, arg2); | |
2096 | if (res != NULL_TREE) | |
2097 | { | |
2098 | gimple_assign_set_rhs_from_tree (gsi, res); | |
2099 | update_stmt (gsi_stmt (*gsi)); | |
2100 | return true; | |
2101 | } | |
2102 | ||
10fbe63d | 2103 | if (code == BIT_AND_EXPR || code == BIT_IOR_EXPR) |
2104 | { | |
2105 | enum tree_code ocode = code == BIT_AND_EXPR ? BIT_IOR_EXPR : BIT_AND_EXPR; | |
2106 | if (def1_code == ocode) | |
2107 | { | |
2108 | tree x = arg2; | |
2109 | enum tree_code coden; | |
2110 | tree a1, a2; | |
2111 | /* ( X | Y) & X -> X */ | |
2112 | /* ( X & Y) | X -> X */ | |
2113 | if (x == def1_arg1 | |
2114 | || x == def1_arg2) | |
2115 | { | |
2116 | gimple_assign_set_rhs_from_tree (gsi, x); | |
2117 | update_stmt (gsi_stmt (*gsi)); | |
2118 | return true; | |
2119 | } | |
2120 | ||
2121 | defcodefor_name (def1_arg1, &coden, &a1, &a2); | |
2122 | /* (~X | Y) & X -> X & Y */ | |
2123 | /* (~X & Y) | X -> X | Y */ | |
2124 | if (coden == BIT_NOT_EXPR && a1 == x) | |
2125 | { | |
2126 | gimple_assign_set_rhs_with_ops (gsi, code, | |
2127 | x, def1_arg2); | |
2128 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
2129 | update_stmt (stmt); | |
2130 | return true; | |
2131 | } | |
2132 | defcodefor_name (def1_arg2, &coden, &a1, &a2); | |
2133 | /* (Y | ~X) & X -> X & Y */ | |
2134 | /* (Y & ~X) | X -> X | Y */ | |
2135 | if (coden == BIT_NOT_EXPR && a1 == x) | |
2136 | { | |
2137 | gimple_assign_set_rhs_with_ops (gsi, code, | |
2138 | x, def1_arg1); | |
2139 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
2140 | update_stmt (stmt); | |
2141 | return true; | |
2142 | } | |
2143 | } | |
2144 | if (def2_code == ocode) | |
2145 | { | |
2146 | enum tree_code coden; | |
2147 | tree a1; | |
2148 | tree x = arg1; | |
2149 | /* X & ( X | Y) -> X */ | |
2150 | /* X | ( X & Y) -> X */ | |
2151 | if (x == def2_arg1 | |
2152 | || x == def2_arg2) | |
2153 | { | |
2154 | gimple_assign_set_rhs_from_tree (gsi, x); | |
2155 | update_stmt (gsi_stmt (*gsi)); | |
2156 | return true; | |
2157 | } | |
2158 | defcodefor_name (def2_arg1, &coden, &a1, NULL); | |
2159 | /* (~X | Y) & X -> X & Y */ | |
2160 | /* (~X & Y) | X -> X | Y */ | |
2161 | if (coden == BIT_NOT_EXPR && a1 == x) | |
2162 | { | |
2163 | gimple_assign_set_rhs_with_ops (gsi, code, | |
2164 | x, def2_arg2); | |
2165 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
2166 | update_stmt (stmt); | |
2167 | return true; | |
2168 | } | |
2169 | defcodefor_name (def2_arg2, &coden, &a1, NULL); | |
2170 | /* (Y | ~X) & X -> X & Y */ | |
2171 | /* (Y & ~X) | X -> X | Y */ | |
2172 | if (coden == BIT_NOT_EXPR && a1 == x) | |
2173 | { | |
2174 | gimple_assign_set_rhs_with_ops (gsi, code, | |
2175 | x, def2_arg1); | |
2176 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
2177 | update_stmt (stmt); | |
2178 | return true; | |
2179 | } | |
2180 | } | |
10fbe63d | 2181 | |
16bc66ec | 2182 | /* If arg1 and arg2 are booleans (or any single bit type) |
2183 | then try to simplify: | |
2184 | ||
2185 | (~X & Y) -> X < Y | |
2186 | (X & ~Y) -> Y < X | |
2187 | (~X | Y) -> X <= Y | |
2188 | (X | ~Y) -> Y <= X | |
2189 | ||
2190 | But only do this if our result feeds into a comparison as | |
2191 | this transformation is not always a win, particularly on | |
2192 | targets with and-not instructions. */ | |
2193 | if (TREE_CODE (arg1) == SSA_NAME | |
2194 | && TREE_CODE (arg2) == SSA_NAME | |
2195 | && INTEGRAL_TYPE_P (TREE_TYPE (arg1)) | |
2196 | && TYPE_PRECISION (TREE_TYPE (arg1)) == 1 | |
2197 | && TYPE_PRECISION (TREE_TYPE (arg2)) == 1 | |
2198 | && (TYPE_UNSIGNED (TREE_TYPE (arg1)) | |
2199 | == TYPE_UNSIGNED (TREE_TYPE (arg2)))) | |
2200 | { | |
2201 | use_operand_p use_p; | |
2202 | gimple use_stmt; | |
2203 | ||
2204 | if (single_imm_use (gimple_assign_lhs (stmt), &use_p, &use_stmt)) | |
2205 | { | |
2206 | if (gimple_code (use_stmt) == GIMPLE_COND | |
2207 | && gimple_cond_lhs (use_stmt) == gimple_assign_lhs (stmt) | |
2208 | && integer_zerop (gimple_cond_rhs (use_stmt)) | |
2209 | && gimple_cond_code (use_stmt) == NE_EXPR) | |
2210 | { | |
2211 | if (simplify_bitwise_binary_boolean (gsi, code, arg1, arg2)) | |
2212 | return true; | |
2213 | if (simplify_bitwise_binary_boolean (gsi, code, arg2, arg1)) | |
2214 | return true; | |
2215 | } | |
2216 | } | |
2217 | } | |
2218 | } | |
300da094 | 2219 | return false; |
1c4607fd | 2220 | } |
2221 | ||
ca3c9092 | 2222 | |
3b8827a2 | 2223 | /* Recognize rotation patterns. Return true if a transformation |
2224 | applied, otherwise return false. | |
2225 | ||
2226 | We are looking for X with unsigned type T with bitsize B, OP being | |
2227 | +, | or ^, some type T2 wider than T and | |
2228 | (X << CNT1) OP (X >> CNT2) iff CNT1 + CNT2 == B | |
2229 | ((T) ((T2) X << CNT1)) OP ((T) ((T2) X >> CNT2)) iff CNT1 + CNT2 == B | |
2230 | (X << Y) OP (X >> (B - Y)) | |
2231 | (X << (int) Y) OP (X >> (int) (B - Y)) | |
2232 | ((T) ((T2) X << Y)) OP ((T) ((T2) X >> (B - Y))) | |
2233 | ((T) ((T2) X << (int) Y)) OP ((T) ((T2) X >> (int) (B - Y))) | |
043ce677 | 2234 | (X << Y) | (X >> ((-Y) & (B - 1))) |
2235 | (X << (int) Y) | (X >> (int) ((-Y) & (B - 1))) | |
2236 | ((T) ((T2) X << Y)) | ((T) ((T2) X >> ((-Y) & (B - 1)))) | |
2237 | ((T) ((T2) X << (int) Y)) | ((T) ((T2) X >> (int) ((-Y) & (B - 1)))) | |
3b8827a2 | 2238 | |
2239 | and transform these into: | |
2240 | X r<< CNT1 | |
2241 | X r<< Y | |
2242 | ||
2243 | Note, in the patterns with T2 type, the type of OP operands | |
2244 | might be even a signed type, but should have precision B. */ | |
2245 | ||
2246 | static bool | |
2247 | simplify_rotate (gimple_stmt_iterator *gsi) | |
2248 | { | |
2249 | gimple stmt = gsi_stmt (*gsi); | |
2250 | tree arg[2], rtype, rotcnt = NULL_TREE; | |
2251 | tree def_arg1[2], def_arg2[2]; | |
2252 | enum tree_code def_code[2]; | |
2253 | tree lhs; | |
2254 | int i; | |
2255 | bool swapped_p = false; | |
2256 | gimple g; | |
2257 | ||
2258 | arg[0] = gimple_assign_rhs1 (stmt); | |
2259 | arg[1] = gimple_assign_rhs2 (stmt); | |
2260 | rtype = TREE_TYPE (arg[0]); | |
2261 | ||
2262 | /* Only create rotates in complete modes. Other cases are not | |
2263 | expanded properly. */ | |
2264 | if (!INTEGRAL_TYPE_P (rtype) | |
2265 | || TYPE_PRECISION (rtype) != GET_MODE_PRECISION (TYPE_MODE (rtype))) | |
2266 | return false; | |
2267 | ||
2268 | for (i = 0; i < 2; i++) | |
2269 | defcodefor_name (arg[i], &def_code[i], &def_arg1[i], &def_arg2[i]); | |
2270 | ||
2271 | /* Look through narrowing conversions. */ | |
2272 | if (CONVERT_EXPR_CODE_P (def_code[0]) | |
2273 | && CONVERT_EXPR_CODE_P (def_code[1]) | |
2274 | && INTEGRAL_TYPE_P (TREE_TYPE (def_arg1[0])) | |
2275 | && INTEGRAL_TYPE_P (TREE_TYPE (def_arg1[1])) | |
2276 | && TYPE_PRECISION (TREE_TYPE (def_arg1[0])) | |
2277 | == TYPE_PRECISION (TREE_TYPE (def_arg1[1])) | |
2278 | && TYPE_PRECISION (TREE_TYPE (def_arg1[0])) > TYPE_PRECISION (rtype) | |
2279 | && has_single_use (arg[0]) | |
2280 | && has_single_use (arg[1])) | |
2281 | { | |
2282 | for (i = 0; i < 2; i++) | |
2283 | { | |
2284 | arg[i] = def_arg1[i]; | |
2285 | defcodefor_name (arg[i], &def_code[i], &def_arg1[i], &def_arg2[i]); | |
2286 | } | |
2287 | } | |
2288 | ||
2289 | /* One operand has to be LSHIFT_EXPR and one RSHIFT_EXPR. */ | |
2290 | for (i = 0; i < 2; i++) | |
2291 | if (def_code[i] != LSHIFT_EXPR && def_code[i] != RSHIFT_EXPR) | |
2292 | return false; | |
2293 | else if (!has_single_use (arg[i])) | |
2294 | return false; | |
2295 | if (def_code[0] == def_code[1]) | |
2296 | return false; | |
2297 | ||
2298 | /* If we've looked through narrowing conversions before, look through | |
2299 | widening conversions from unsigned type with the same precision | |
2300 | as rtype here. */ | |
2301 | if (TYPE_PRECISION (TREE_TYPE (def_arg1[0])) != TYPE_PRECISION (rtype)) | |
2302 | for (i = 0; i < 2; i++) | |
2303 | { | |
2304 | tree tem; | |
2305 | enum tree_code code; | |
2306 | defcodefor_name (def_arg1[i], &code, &tem, NULL); | |
2307 | if (!CONVERT_EXPR_CODE_P (code) | |
2308 | || !INTEGRAL_TYPE_P (TREE_TYPE (tem)) | |
2309 | || TYPE_PRECISION (TREE_TYPE (tem)) != TYPE_PRECISION (rtype)) | |
2310 | return false; | |
2311 | def_arg1[i] = tem; | |
2312 | } | |
2313 | /* Both shifts have to use the same first operand. */ | |
2314 | if (TREE_CODE (def_arg1[0]) != SSA_NAME || def_arg1[0] != def_arg1[1]) | |
2315 | return false; | |
2316 | if (!TYPE_UNSIGNED (TREE_TYPE (def_arg1[0]))) | |
2317 | return false; | |
2318 | ||
2319 | /* CNT1 + CNT2 == B case above. */ | |
e913b5cd | 2320 | if (tree_fits_uhwi_p (def_arg2[0]) |
2321 | && tree_fits_uhwi_p (def_arg2[1]) | |
aa59f000 | 2322 | && tree_to_uhwi (def_arg2[0]) |
e913b5cd | 2323 | + tree_to_uhwi (def_arg2[1]) == TYPE_PRECISION (rtype)) |
3b8827a2 | 2324 | rotcnt = def_arg2[0]; |
2325 | else if (TREE_CODE (def_arg2[0]) != SSA_NAME | |
2326 | || TREE_CODE (def_arg2[1]) != SSA_NAME) | |
2327 | return false; | |
2328 | else | |
2329 | { | |
2330 | tree cdef_arg1[2], cdef_arg2[2], def_arg2_alt[2]; | |
2331 | enum tree_code cdef_code[2]; | |
2332 | /* Look through conversion of the shift count argument. | |
2333 | The C/C++ FE cast any shift count argument to integer_type_node. | |
2334 | The only problem might be if the shift count type maximum value | |
2335 | is equal or smaller than number of bits in rtype. */ | |
2336 | for (i = 0; i < 2; i++) | |
2337 | { | |
2338 | def_arg2_alt[i] = def_arg2[i]; | |
2339 | defcodefor_name (def_arg2[i], &cdef_code[i], | |
2340 | &cdef_arg1[i], &cdef_arg2[i]); | |
2341 | if (CONVERT_EXPR_CODE_P (cdef_code[i]) | |
2342 | && INTEGRAL_TYPE_P (TREE_TYPE (cdef_arg1[i])) | |
2343 | && TYPE_PRECISION (TREE_TYPE (cdef_arg1[i])) | |
2344 | > floor_log2 (TYPE_PRECISION (rtype)) | |
2345 | && TYPE_PRECISION (TREE_TYPE (cdef_arg1[i])) | |
2346 | == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (cdef_arg1[i])))) | |
2347 | { | |
2348 | def_arg2_alt[i] = cdef_arg1[i]; | |
2349 | defcodefor_name (def_arg2_alt[i], &cdef_code[i], | |
2350 | &cdef_arg1[i], &cdef_arg2[i]); | |
2351 | } | |
2352 | } | |
2353 | for (i = 0; i < 2; i++) | |
2354 | /* Check for one shift count being Y and the other B - Y, | |
2355 | with optional casts. */ | |
2356 | if (cdef_code[i] == MINUS_EXPR | |
e913b5cd | 2357 | && tree_fits_shwi_p (cdef_arg1[i]) |
2358 | && tree_to_shwi (cdef_arg1[i]) == TYPE_PRECISION (rtype) | |
3b8827a2 | 2359 | && TREE_CODE (cdef_arg2[i]) == SSA_NAME) |
2360 | { | |
2361 | tree tem; | |
2362 | enum tree_code code; | |
2363 | ||
2364 | if (cdef_arg2[i] == def_arg2[1 - i] | |
2365 | || cdef_arg2[i] == def_arg2_alt[1 - i]) | |
2366 | { | |
2367 | rotcnt = cdef_arg2[i]; | |
2368 | break; | |
2369 | } | |
2370 | defcodefor_name (cdef_arg2[i], &code, &tem, NULL); | |
2371 | if (CONVERT_EXPR_CODE_P (code) | |
2372 | && INTEGRAL_TYPE_P (TREE_TYPE (tem)) | |
2373 | && TYPE_PRECISION (TREE_TYPE (tem)) | |
2374 | > floor_log2 (TYPE_PRECISION (rtype)) | |
2375 | && TYPE_PRECISION (TREE_TYPE (tem)) | |
2376 | == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (tem))) | |
2377 | && (tem == def_arg2[1 - i] | |
2378 | || tem == def_arg2_alt[1 - i])) | |
2379 | { | |
2380 | rotcnt = tem; | |
2381 | break; | |
2382 | } | |
2383 | } | |
2384 | /* The above sequence isn't safe for Y being 0, | |
2385 | because then one of the shifts triggers undefined behavior. | |
2386 | This alternative is safe even for rotation count of 0. | |
2387 | One shift count is Y and the other (-Y) & (B - 1). */ | |
2388 | else if (cdef_code[i] == BIT_AND_EXPR | |
e913b5cd | 2389 | && tree_fits_shwi_p (cdef_arg2[i]) |
2390 | && tree_to_shwi (cdef_arg2[i]) | |
3b8827a2 | 2391 | == TYPE_PRECISION (rtype) - 1 |
043ce677 | 2392 | && TREE_CODE (cdef_arg1[i]) == SSA_NAME |
2393 | && gimple_assign_rhs_code (stmt) == BIT_IOR_EXPR) | |
3b8827a2 | 2394 | { |
2395 | tree tem; | |
2396 | enum tree_code code; | |
2397 | ||
2398 | defcodefor_name (cdef_arg1[i], &code, &tem, NULL); | |
2399 | if (CONVERT_EXPR_CODE_P (code) | |
2400 | && INTEGRAL_TYPE_P (TREE_TYPE (tem)) | |
2401 | && TYPE_PRECISION (TREE_TYPE (tem)) | |
2402 | > floor_log2 (TYPE_PRECISION (rtype)) | |
2403 | && TYPE_PRECISION (TREE_TYPE (tem)) | |
2404 | == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (tem)))) | |
2405 | defcodefor_name (tem, &code, &tem, NULL); | |
2406 | ||
2407 | if (code == NEGATE_EXPR) | |
2408 | { | |
2409 | if (tem == def_arg2[1 - i] || tem == def_arg2_alt[1 - i]) | |
2410 | { | |
2411 | rotcnt = tem; | |
2412 | break; | |
2413 | } | |
2414 | defcodefor_name (tem, &code, &tem, NULL); | |
2415 | if (CONVERT_EXPR_CODE_P (code) | |
2416 | && INTEGRAL_TYPE_P (TREE_TYPE (tem)) | |
2417 | && TYPE_PRECISION (TREE_TYPE (tem)) | |
2418 | > floor_log2 (TYPE_PRECISION (rtype)) | |
2419 | && TYPE_PRECISION (TREE_TYPE (tem)) | |
2420 | == GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (tem))) | |
2421 | && (tem == def_arg2[1 - i] | |
2422 | || tem == def_arg2_alt[1 - i])) | |
2423 | { | |
2424 | rotcnt = tem; | |
2425 | break; | |
2426 | } | |
2427 | } | |
2428 | } | |
2429 | if (rotcnt == NULL_TREE) | |
2430 | return false; | |
2431 | swapped_p = i != 1; | |
2432 | } | |
2433 | ||
2434 | if (!useless_type_conversion_p (TREE_TYPE (def_arg2[0]), | |
2435 | TREE_TYPE (rotcnt))) | |
2436 | { | |
2437 | g = gimple_build_assign_with_ops (NOP_EXPR, | |
2438 | make_ssa_name (TREE_TYPE (def_arg2[0]), | |
2439 | NULL), | |
2440 | rotcnt, NULL_TREE); | |
2441 | gsi_insert_before (gsi, g, GSI_SAME_STMT); | |
2442 | rotcnt = gimple_assign_lhs (g); | |
2443 | } | |
2444 | lhs = gimple_assign_lhs (stmt); | |
2445 | if (!useless_type_conversion_p (rtype, TREE_TYPE (def_arg1[0]))) | |
2446 | lhs = make_ssa_name (TREE_TYPE (def_arg1[0]), NULL); | |
2447 | g = gimple_build_assign_with_ops (((def_code[0] == LSHIFT_EXPR) ^ swapped_p) | |
2448 | ? LROTATE_EXPR : RROTATE_EXPR, | |
2449 | lhs, def_arg1[0], rotcnt); | |
2450 | if (!useless_type_conversion_p (rtype, TREE_TYPE (def_arg1[0]))) | |
2451 | { | |
2452 | gsi_insert_before (gsi, g, GSI_SAME_STMT); | |
2453 | g = gimple_build_assign_with_ops (NOP_EXPR, gimple_assign_lhs (stmt), | |
2454 | lhs, NULL_TREE); | |
2455 | } | |
2456 | gsi_replace (gsi, g, false); | |
2457 | return true; | |
2458 | } | |
2459 | ||
ca3c9092 | 2460 | /* Perform re-associations of the plus or minus statement STMT that are |
b69d1cb6 | 2461 | always permitted. Returns true if the CFG was changed. */ |
ca3c9092 | 2462 | |
b69d1cb6 | 2463 | static bool |
50aacf4c | 2464 | associate_plusminus (gimple_stmt_iterator *gsi) |
ca3c9092 | 2465 | { |
50aacf4c | 2466 | gimple stmt = gsi_stmt (*gsi); |
ca3c9092 | 2467 | tree rhs1 = gimple_assign_rhs1 (stmt); |
2468 | tree rhs2 = gimple_assign_rhs2 (stmt); | |
2469 | enum tree_code code = gimple_assign_rhs_code (stmt); | |
ca3c9092 | 2470 | bool changed; |
2471 | ||
2472 | /* We can't reassociate at all for saturating types. */ | |
2473 | if (TYPE_SATURATING (TREE_TYPE (rhs1))) | |
b69d1cb6 | 2474 | return false; |
ca3c9092 | 2475 | |
2476 | /* First contract negates. */ | |
2477 | do | |
2478 | { | |
2479 | changed = false; | |
2480 | ||
2481 | /* A +- (-B) -> A -+ B. */ | |
2482 | if (TREE_CODE (rhs2) == SSA_NAME) | |
2483 | { | |
2484 | gimple def_stmt = SSA_NAME_DEF_STMT (rhs2); | |
2485 | if (is_gimple_assign (def_stmt) | |
32cdcc42 | 2486 | && gimple_assign_rhs_code (def_stmt) == NEGATE_EXPR |
2487 | && can_propagate_from (def_stmt)) | |
ca3c9092 | 2488 | { |
2489 | code = (code == MINUS_EXPR) ? PLUS_EXPR : MINUS_EXPR; | |
2490 | gimple_assign_set_rhs_code (stmt, code); | |
2491 | rhs2 = gimple_assign_rhs1 (def_stmt); | |
2492 | gimple_assign_set_rhs2 (stmt, rhs2); | |
2493 | gimple_set_modified (stmt, true); | |
2494 | changed = true; | |
2495 | } | |
2496 | } | |
2497 | ||
2498 | /* (-A) + B -> B - A. */ | |
2499 | if (TREE_CODE (rhs1) == SSA_NAME | |
2500 | && code == PLUS_EXPR) | |
2501 | { | |
2502 | gimple def_stmt = SSA_NAME_DEF_STMT (rhs1); | |
2503 | if (is_gimple_assign (def_stmt) | |
32cdcc42 | 2504 | && gimple_assign_rhs_code (def_stmt) == NEGATE_EXPR |
2505 | && can_propagate_from (def_stmt)) | |
ca3c9092 | 2506 | { |
2507 | code = MINUS_EXPR; | |
2508 | gimple_assign_set_rhs_code (stmt, code); | |
2509 | rhs1 = rhs2; | |
2510 | gimple_assign_set_rhs1 (stmt, rhs1); | |
2511 | rhs2 = gimple_assign_rhs1 (def_stmt); | |
2512 | gimple_assign_set_rhs2 (stmt, rhs2); | |
2513 | gimple_set_modified (stmt, true); | |
2514 | changed = true; | |
2515 | } | |
2516 | } | |
2517 | } | |
2518 | while (changed); | |
2519 | ||
2520 | /* We can't reassociate floating-point or fixed-point plus or minus | |
2521 | because of saturation to +-Inf. */ | |
2522 | if (FLOAT_TYPE_P (TREE_TYPE (rhs1)) | |
2523 | || FIXED_POINT_TYPE_P (TREE_TYPE (rhs1))) | |
2524 | goto out; | |
2525 | ||
2526 | /* Second match patterns that allow contracting a plus-minus pair | |
2527 | irrespective of overflow issues. | |
2528 | ||
2529 | (A +- B) - A -> +- B | |
2530 | (A +- B) -+ B -> A | |
2531 | (CST +- A) +- CST -> CST +- A | |
2c83a45e | 2532 | (A +- CST) +- CST -> A +- CST |
ca3c9092 | 2533 | ~A + A -> -1 |
2534 | ~A + 1 -> -A | |
2535 | A - (A +- B) -> -+ B | |
2536 | A +- (B +- A) -> +- B | |
2537 | CST +- (CST +- A) -> CST +- A | |
2538 | CST +- (A +- CST) -> CST +- A | |
2539 | A + ~A -> -1 | |
2540 | ||
2541 | via commutating the addition and contracting operations to zero | |
2542 | by reassociation. */ | |
2543 | ||
ca3c9092 | 2544 | if (TREE_CODE (rhs1) == SSA_NAME) |
2545 | { | |
2546 | gimple def_stmt = SSA_NAME_DEF_STMT (rhs1); | |
32cdcc42 | 2547 | if (is_gimple_assign (def_stmt) && can_propagate_from (def_stmt)) |
ca3c9092 | 2548 | { |
2549 | enum tree_code def_code = gimple_assign_rhs_code (def_stmt); | |
2550 | if (def_code == PLUS_EXPR | |
2551 | || def_code == MINUS_EXPR) | |
2552 | { | |
2553 | tree def_rhs1 = gimple_assign_rhs1 (def_stmt); | |
2554 | tree def_rhs2 = gimple_assign_rhs2 (def_stmt); | |
2555 | if (operand_equal_p (def_rhs1, rhs2, 0) | |
2556 | && code == MINUS_EXPR) | |
2557 | { | |
2558 | /* (A +- B) - A -> +- B. */ | |
2559 | code = ((def_code == PLUS_EXPR) | |
2560 | ? TREE_CODE (def_rhs2) : NEGATE_EXPR); | |
2561 | rhs1 = def_rhs2; | |
2562 | rhs2 = NULL_TREE; | |
50aacf4c | 2563 | gimple_assign_set_rhs_with_ops (gsi, code, rhs1, NULL_TREE); |
2564 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
ca3c9092 | 2565 | gimple_set_modified (stmt, true); |
2566 | } | |
2567 | else if (operand_equal_p (def_rhs2, rhs2, 0) | |
2568 | && code != def_code) | |
2569 | { | |
2570 | /* (A +- B) -+ B -> A. */ | |
2571 | code = TREE_CODE (def_rhs1); | |
2572 | rhs1 = def_rhs1; | |
2573 | rhs2 = NULL_TREE; | |
50aacf4c | 2574 | gimple_assign_set_rhs_with_ops (gsi, code, rhs1, NULL_TREE); |
2575 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
ca3c9092 | 2576 | gimple_set_modified (stmt, true); |
2577 | } | |
2c83a45e | 2578 | else if (CONSTANT_CLASS_P (rhs2) |
2579 | && CONSTANT_CLASS_P (def_rhs1)) | |
ca3c9092 | 2580 | { |
2581 | /* (CST +- A) +- CST -> CST +- A. */ | |
2582 | tree cst = fold_binary (code, TREE_TYPE (rhs1), | |
2583 | def_rhs1, rhs2); | |
2584 | if (cst && !TREE_OVERFLOW (cst)) | |
2585 | { | |
2586 | code = def_code; | |
2587 | gimple_assign_set_rhs_code (stmt, code); | |
2588 | rhs1 = cst; | |
2589 | gimple_assign_set_rhs1 (stmt, rhs1); | |
2590 | rhs2 = def_rhs2; | |
2591 | gimple_assign_set_rhs2 (stmt, rhs2); | |
2592 | gimple_set_modified (stmt, true); | |
2593 | } | |
2594 | } | |
2c83a45e | 2595 | else if (CONSTANT_CLASS_P (rhs2) |
2596 | && CONSTANT_CLASS_P (def_rhs2)) | |
ca3c9092 | 2597 | { |
2c83a45e | 2598 | /* (A +- CST) +- CST -> A +- CST. */ |
2599 | enum tree_code mix = (code == def_code) | |
2600 | ? PLUS_EXPR : MINUS_EXPR; | |
2601 | tree cst = fold_binary (mix, TREE_TYPE (rhs1), | |
ca3c9092 | 2602 | def_rhs2, rhs2); |
2603 | if (cst && !TREE_OVERFLOW (cst)) | |
2604 | { | |
2c83a45e | 2605 | code = def_code; |
ca3c9092 | 2606 | gimple_assign_set_rhs_code (stmt, code); |
2607 | rhs1 = def_rhs1; | |
2608 | gimple_assign_set_rhs1 (stmt, rhs1); | |
2609 | rhs2 = cst; | |
2610 | gimple_assign_set_rhs2 (stmt, rhs2); | |
2611 | gimple_set_modified (stmt, true); | |
2612 | } | |
2613 | } | |
2614 | } | |
2c83a45e | 2615 | else if (def_code == BIT_NOT_EXPR && code == PLUS_EXPR) |
ca3c9092 | 2616 | { |
2617 | tree def_rhs1 = gimple_assign_rhs1 (def_stmt); | |
2c83a45e | 2618 | if (operand_equal_p (def_rhs1, rhs2, 0)) |
ca3c9092 | 2619 | { |
2620 | /* ~A + A -> -1. */ | |
2c83a45e | 2621 | rhs1 = build_all_ones_cst (TREE_TYPE (rhs2)); |
ca3c9092 | 2622 | rhs2 = NULL_TREE; |
2c83a45e | 2623 | code = TREE_CODE (rhs1); |
50aacf4c | 2624 | gimple_assign_set_rhs_with_ops (gsi, code, rhs1, NULL_TREE); |
2625 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
ca3c9092 | 2626 | gimple_set_modified (stmt, true); |
2627 | } | |
2c83a45e | 2628 | else if ((TREE_CODE (TREE_TYPE (rhs2)) != COMPLEX_TYPE |
2629 | && integer_onep (rhs2)) | |
2630 | || (TREE_CODE (rhs2) == COMPLEX_CST | |
2631 | && integer_onep (TREE_REALPART (rhs2)) | |
2632 | && integer_onep (TREE_IMAGPART (rhs2)))) | |
ca3c9092 | 2633 | { |
2634 | /* ~A + 1 -> -A. */ | |
2635 | code = NEGATE_EXPR; | |
2636 | rhs1 = def_rhs1; | |
2637 | rhs2 = NULL_TREE; | |
50aacf4c | 2638 | gimple_assign_set_rhs_with_ops (gsi, code, rhs1, NULL_TREE); |
2639 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
ca3c9092 | 2640 | gimple_set_modified (stmt, true); |
2641 | } | |
2642 | } | |
2643 | } | |
2644 | } | |
2645 | ||
2646 | if (rhs2 && TREE_CODE (rhs2) == SSA_NAME) | |
2647 | { | |
2648 | gimple def_stmt = SSA_NAME_DEF_STMT (rhs2); | |
32cdcc42 | 2649 | if (is_gimple_assign (def_stmt) && can_propagate_from (def_stmt)) |
ca3c9092 | 2650 | { |
2651 | enum tree_code def_code = gimple_assign_rhs_code (def_stmt); | |
2652 | if (def_code == PLUS_EXPR | |
2653 | || def_code == MINUS_EXPR) | |
2654 | { | |
2655 | tree def_rhs1 = gimple_assign_rhs1 (def_stmt); | |
2656 | tree def_rhs2 = gimple_assign_rhs2 (def_stmt); | |
2657 | if (operand_equal_p (def_rhs1, rhs1, 0) | |
2658 | && code == MINUS_EXPR) | |
2659 | { | |
2660 | /* A - (A +- B) -> -+ B. */ | |
2661 | code = ((def_code == PLUS_EXPR) | |
2662 | ? NEGATE_EXPR : TREE_CODE (def_rhs2)); | |
2663 | rhs1 = def_rhs2; | |
2664 | rhs2 = NULL_TREE; | |
50aacf4c | 2665 | gimple_assign_set_rhs_with_ops (gsi, code, rhs1, NULL_TREE); |
2666 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
ca3c9092 | 2667 | gimple_set_modified (stmt, true); |
2668 | } | |
2669 | else if (operand_equal_p (def_rhs2, rhs1, 0) | |
2670 | && code != def_code) | |
2671 | { | |
2672 | /* A +- (B +- A) -> +- B. */ | |
2673 | code = ((code == PLUS_EXPR) | |
2674 | ? TREE_CODE (def_rhs1) : NEGATE_EXPR); | |
2675 | rhs1 = def_rhs1; | |
2676 | rhs2 = NULL_TREE; | |
50aacf4c | 2677 | gimple_assign_set_rhs_with_ops (gsi, code, rhs1, NULL_TREE); |
2678 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
ca3c9092 | 2679 | gimple_set_modified (stmt, true); |
2680 | } | |
2c83a45e | 2681 | else if (CONSTANT_CLASS_P (rhs1) |
2682 | && CONSTANT_CLASS_P (def_rhs1)) | |
ca3c9092 | 2683 | { |
2684 | /* CST +- (CST +- A) -> CST +- A. */ | |
2685 | tree cst = fold_binary (code, TREE_TYPE (rhs2), | |
2686 | rhs1, def_rhs1); | |
2687 | if (cst && !TREE_OVERFLOW (cst)) | |
2688 | { | |
2689 | code = (code == def_code ? PLUS_EXPR : MINUS_EXPR); | |
2690 | gimple_assign_set_rhs_code (stmt, code); | |
2691 | rhs1 = cst; | |
2692 | gimple_assign_set_rhs1 (stmt, rhs1); | |
2693 | rhs2 = def_rhs2; | |
2694 | gimple_assign_set_rhs2 (stmt, rhs2); | |
2695 | gimple_set_modified (stmt, true); | |
2696 | } | |
2697 | } | |
2c83a45e | 2698 | else if (CONSTANT_CLASS_P (rhs1) |
2699 | && CONSTANT_CLASS_P (def_rhs2)) | |
ca3c9092 | 2700 | { |
2701 | /* CST +- (A +- CST) -> CST +- A. */ | |
2702 | tree cst = fold_binary (def_code == code | |
2703 | ? PLUS_EXPR : MINUS_EXPR, | |
2704 | TREE_TYPE (rhs2), | |
2705 | rhs1, def_rhs2); | |
2706 | if (cst && !TREE_OVERFLOW (cst)) | |
2707 | { | |
2708 | rhs1 = cst; | |
2709 | gimple_assign_set_rhs1 (stmt, rhs1); | |
2710 | rhs2 = def_rhs1; | |
2711 | gimple_assign_set_rhs2 (stmt, rhs2); | |
2712 | gimple_set_modified (stmt, true); | |
2713 | } | |
2714 | } | |
2715 | } | |
2c83a45e | 2716 | else if (def_code == BIT_NOT_EXPR) |
ca3c9092 | 2717 | { |
2718 | tree def_rhs1 = gimple_assign_rhs1 (def_stmt); | |
2719 | if (code == PLUS_EXPR | |
2720 | && operand_equal_p (def_rhs1, rhs1, 0)) | |
2721 | { | |
2722 | /* A + ~A -> -1. */ | |
2c83a45e | 2723 | rhs1 = build_all_ones_cst (TREE_TYPE (rhs1)); |
ca3c9092 | 2724 | rhs2 = NULL_TREE; |
2c83a45e | 2725 | code = TREE_CODE (rhs1); |
50aacf4c | 2726 | gimple_assign_set_rhs_with_ops (gsi, code, rhs1, NULL_TREE); |
2727 | gcc_assert (gsi_stmt (*gsi) == stmt); | |
ca3c9092 | 2728 | gimple_set_modified (stmt, true); |
2729 | } | |
2730 | } | |
2731 | } | |
2732 | } | |
2733 | ||
2734 | out: | |
2735 | if (gimple_modified_p (stmt)) | |
2736 | { | |
50aacf4c | 2737 | fold_stmt_inplace (gsi); |
ca3c9092 | 2738 | update_stmt (stmt); |
b69d1cb6 | 2739 | if (maybe_clean_or_replace_eh_stmt (stmt, stmt) |
2740 | && gimple_purge_dead_eh_edges (gimple_bb (stmt))) | |
2741 | return true; | |
ca3c9092 | 2742 | } |
b69d1cb6 | 2743 | |
2744 | return false; | |
ca3c9092 | 2745 | } |
2746 | ||
c9c17332 | 2747 | /* Associate operands of a POINTER_PLUS_EXPR assignmen at *GSI. Returns |
2748 | true if anything changed, false otherwise. */ | |
2749 | ||
2750 | static bool | |
2751 | associate_pointerplus (gimple_stmt_iterator *gsi) | |
2752 | { | |
2753 | gimple stmt = gsi_stmt (*gsi); | |
2754 | gimple def_stmt; | |
2755 | tree ptr, rhs, algn; | |
2756 | ||
2757 | /* Pattern match | |
2758 | tem = (sizetype) ptr; | |
2759 | tem = tem & algn; | |
2760 | tem = -tem; | |
2761 | ... = ptr p+ tem; | |
2762 | and produce the simpler and easier to analyze with respect to alignment | |
2763 | ... = ptr & ~algn; */ | |
2764 | ptr = gimple_assign_rhs1 (stmt); | |
2765 | rhs = gimple_assign_rhs2 (stmt); | |
2766 | if (TREE_CODE (rhs) != SSA_NAME) | |
2767 | return false; | |
2768 | def_stmt = SSA_NAME_DEF_STMT (rhs); | |
2769 | if (!is_gimple_assign (def_stmt) | |
2770 | || gimple_assign_rhs_code (def_stmt) != NEGATE_EXPR) | |
2771 | return false; | |
2772 | rhs = gimple_assign_rhs1 (def_stmt); | |
2773 | if (TREE_CODE (rhs) != SSA_NAME) | |
2774 | return false; | |
2775 | def_stmt = SSA_NAME_DEF_STMT (rhs); | |
2776 | if (!is_gimple_assign (def_stmt) | |
2777 | || gimple_assign_rhs_code (def_stmt) != BIT_AND_EXPR) | |
2778 | return false; | |
2779 | rhs = gimple_assign_rhs1 (def_stmt); | |
2780 | algn = gimple_assign_rhs2 (def_stmt); | |
2781 | if (TREE_CODE (rhs) != SSA_NAME | |
2782 | || TREE_CODE (algn) != INTEGER_CST) | |
2783 | return false; | |
2784 | def_stmt = SSA_NAME_DEF_STMT (rhs); | |
2785 | if (!is_gimple_assign (def_stmt) | |
2786 | || !CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (def_stmt))) | |
2787 | return false; | |
2788 | if (gimple_assign_rhs1 (def_stmt) != ptr) | |
2789 | return false; | |
2790 | ||
6da74b21 | 2791 | algn = wide_int_to_tree (TREE_TYPE (ptr), wi::bit_not (algn)); |
c9c17332 | 2792 | gimple_assign_set_rhs_with_ops (gsi, BIT_AND_EXPR, ptr, algn); |
2793 | fold_stmt_inplace (gsi); | |
2794 | update_stmt (stmt); | |
2795 | ||
2796 | return true; | |
2797 | } | |
2798 | ||
6afd0544 | 2799 | /* Combine two conversions in a row for the second conversion at *GSI. |
89c8f35a | 2800 | Returns 1 if there were any changes made, 2 if cfg-cleanup needs to |
2801 | run. Else it returns 0. */ | |
6afd0544 | 2802 | |
89c8f35a | 2803 | static int |
6afd0544 | 2804 | combine_conversions (gimple_stmt_iterator *gsi) |
2805 | { | |
2806 | gimple stmt = gsi_stmt (*gsi); | |
2807 | gimple def_stmt; | |
2808 | tree op0, lhs; | |
2809 | enum tree_code code = gimple_assign_rhs_code (stmt); | |
487282d5 | 2810 | enum tree_code code2; |
6afd0544 | 2811 | |
2812 | gcc_checking_assert (CONVERT_EXPR_CODE_P (code) | |
2813 | || code == FLOAT_EXPR | |
2814 | || code == FIX_TRUNC_EXPR); | |
2815 | ||
2816 | lhs = gimple_assign_lhs (stmt); | |
2817 | op0 = gimple_assign_rhs1 (stmt); | |
2818 | if (useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (op0))) | |
2819 | { | |
2820 | gimple_assign_set_rhs_code (stmt, TREE_CODE (op0)); | |
89c8f35a | 2821 | return 1; |
6afd0544 | 2822 | } |
2823 | ||
2824 | if (TREE_CODE (op0) != SSA_NAME) | |
89c8f35a | 2825 | return 0; |
6afd0544 | 2826 | |
2827 | def_stmt = SSA_NAME_DEF_STMT (op0); | |
2828 | if (!is_gimple_assign (def_stmt)) | |
89c8f35a | 2829 | return 0; |
6afd0544 | 2830 | |
487282d5 | 2831 | code2 = gimple_assign_rhs_code (def_stmt); |
2832 | ||
2833 | if (CONVERT_EXPR_CODE_P (code2) || code2 == FLOAT_EXPR) | |
6afd0544 | 2834 | { |
2835 | tree defop0 = gimple_assign_rhs1 (def_stmt); | |
2836 | tree type = TREE_TYPE (lhs); | |
2837 | tree inside_type = TREE_TYPE (defop0); | |
2838 | tree inter_type = TREE_TYPE (op0); | |
2839 | int inside_int = INTEGRAL_TYPE_P (inside_type); | |
2840 | int inside_ptr = POINTER_TYPE_P (inside_type); | |
2841 | int inside_float = FLOAT_TYPE_P (inside_type); | |
2842 | int inside_vec = TREE_CODE (inside_type) == VECTOR_TYPE; | |
2843 | unsigned int inside_prec = TYPE_PRECISION (inside_type); | |
2844 | int inside_unsignedp = TYPE_UNSIGNED (inside_type); | |
2845 | int inter_int = INTEGRAL_TYPE_P (inter_type); | |
2846 | int inter_ptr = POINTER_TYPE_P (inter_type); | |
2847 | int inter_float = FLOAT_TYPE_P (inter_type); | |
2848 | int inter_vec = TREE_CODE (inter_type) == VECTOR_TYPE; | |
2849 | unsigned int inter_prec = TYPE_PRECISION (inter_type); | |
2850 | int inter_unsignedp = TYPE_UNSIGNED (inter_type); | |
2851 | int final_int = INTEGRAL_TYPE_P (type); | |
2852 | int final_ptr = POINTER_TYPE_P (type); | |
2853 | int final_float = FLOAT_TYPE_P (type); | |
2854 | int final_vec = TREE_CODE (type) == VECTOR_TYPE; | |
2855 | unsigned int final_prec = TYPE_PRECISION (type); | |
2856 | int final_unsignedp = TYPE_UNSIGNED (type); | |
2857 | ||
3aeff048 | 2858 | /* Don't propagate ssa names that occur in abnormal phis. */ |
2859 | if (TREE_CODE (defop0) == SSA_NAME | |
2860 | && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (defop0)) | |
2861 | return 0; | |
2862 | ||
6afd0544 | 2863 | /* In addition to the cases of two conversions in a row |
2864 | handled below, if we are converting something to its own | |
2865 | type via an object of identical or wider precision, neither | |
2866 | conversion is needed. */ | |
2867 | if (useless_type_conversion_p (type, inside_type) | |
2868 | && (((inter_int || inter_ptr) && final_int) | |
2869 | || (inter_float && final_float)) | |
2870 | && inter_prec >= final_prec) | |
2871 | { | |
2872 | gimple_assign_set_rhs1 (stmt, unshare_expr (defop0)); | |
2873 | gimple_assign_set_rhs_code (stmt, TREE_CODE (defop0)); | |
2874 | update_stmt (stmt); | |
89c8f35a | 2875 | return remove_prop_source_from_use (op0) ? 2 : 1; |
6afd0544 | 2876 | } |
2877 | ||
2878 | /* Likewise, if the intermediate and initial types are either both | |
2879 | float or both integer, we don't need the middle conversion if the | |
2880 | former is wider than the latter and doesn't change the signedness | |
2881 | (for integers). Avoid this if the final type is a pointer since | |
2882 | then we sometimes need the middle conversion. Likewise if the | |
2883 | final type has a precision not equal to the size of its mode. */ | |
2884 | if (((inter_int && inside_int) | |
2885 | || (inter_float && inside_float) | |
2886 | || (inter_vec && inside_vec)) | |
2887 | && inter_prec >= inside_prec | |
2888 | && (inter_float || inter_vec | |
2889 | || inter_unsignedp == inside_unsignedp) | |
51dbf409 | 2890 | && ! (final_prec != GET_MODE_PRECISION (TYPE_MODE (type)) |
6afd0544 | 2891 | && TYPE_MODE (type) == TYPE_MODE (inter_type)) |
2892 | && ! final_ptr | |
2893 | && (! final_vec || inter_prec == inside_prec)) | |
2894 | { | |
2895 | gimple_assign_set_rhs1 (stmt, defop0); | |
2896 | update_stmt (stmt); | |
89c8f35a | 2897 | return remove_prop_source_from_use (op0) ? 2 : 1; |
6afd0544 | 2898 | } |
2899 | ||
2900 | /* If we have a sign-extension of a zero-extended value, we can | |
a6476f88 | 2901 | replace that by a single zero-extension. Likewise if the |
2902 | final conversion does not change precision we can drop the | |
2903 | intermediate conversion. */ | |
6afd0544 | 2904 | if (inside_int && inter_int && final_int |
a6476f88 | 2905 | && ((inside_prec < inter_prec && inter_prec < final_prec |
2906 | && inside_unsignedp && !inter_unsignedp) | |
2907 | || final_prec == inter_prec)) | |
6afd0544 | 2908 | { |
2909 | gimple_assign_set_rhs1 (stmt, defop0); | |
2910 | update_stmt (stmt); | |
89c8f35a | 2911 | return remove_prop_source_from_use (op0) ? 2 : 1; |
6afd0544 | 2912 | } |
2913 | ||
2914 | /* Two conversions in a row are not needed unless: | |
2915 | - some conversion is floating-point (overstrict for now), or | |
2916 | - some conversion is a vector (overstrict for now), or | |
2917 | - the intermediate type is narrower than both initial and | |
2918 | final, or | |
2919 | - the intermediate type and innermost type differ in signedness, | |
2920 | and the outermost type is wider than the intermediate, or | |
2921 | - the initial type is a pointer type and the precisions of the | |
2922 | intermediate and final types differ, or | |
2923 | - the final type is a pointer type and the precisions of the | |
2924 | initial and intermediate types differ. */ | |
2925 | if (! inside_float && ! inter_float && ! final_float | |
2926 | && ! inside_vec && ! inter_vec && ! final_vec | |
2927 | && (inter_prec >= inside_prec || inter_prec >= final_prec) | |
2928 | && ! (inside_int && inter_int | |
2929 | && inter_unsignedp != inside_unsignedp | |
2930 | && inter_prec < final_prec) | |
2931 | && ((inter_unsignedp && inter_prec > inside_prec) | |
2932 | == (final_unsignedp && final_prec > inter_prec)) | |
2933 | && ! (inside_ptr && inter_prec != final_prec) | |
2934 | && ! (final_ptr && inside_prec != inter_prec) | |
51dbf409 | 2935 | && ! (final_prec != GET_MODE_PRECISION (TYPE_MODE (type)) |
6afd0544 | 2936 | && TYPE_MODE (type) == TYPE_MODE (inter_type))) |
2937 | { | |
2938 | gimple_assign_set_rhs1 (stmt, defop0); | |
2939 | update_stmt (stmt); | |
89c8f35a | 2940 | return remove_prop_source_from_use (op0) ? 2 : 1; |
6afd0544 | 2941 | } |
2942 | ||
2943 | /* A truncation to an unsigned type should be canonicalized as | |
2944 | bitwise and of a mask. */ | |
2945 | if (final_int && inter_int && inside_int | |
2946 | && final_prec == inside_prec | |
2947 | && final_prec > inter_prec | |
2948 | && inter_unsignedp) | |
2949 | { | |
2950 | tree tem; | |
2951 | tem = fold_build2 (BIT_AND_EXPR, inside_type, | |
2952 | defop0, | |
e913b5cd | 2953 | wide_int_to_tree |
796b6678 | 2954 | (inside_type, |
2955 | wi::mask (inter_prec, false, | |
2956 | TYPE_PRECISION (inside_type)))); | |
6afd0544 | 2957 | if (!useless_type_conversion_p (type, inside_type)) |
2958 | { | |
2959 | tem = force_gimple_operand_gsi (gsi, tem, true, NULL_TREE, true, | |
2960 | GSI_SAME_STMT); | |
2961 | gimple_assign_set_rhs1 (stmt, tem); | |
2962 | } | |
2963 | else | |
2964 | gimple_assign_set_rhs_from_tree (gsi, tem); | |
2965 | update_stmt (gsi_stmt (*gsi)); | |
89c8f35a | 2966 | return 1; |
6afd0544 | 2967 | } |
487282d5 | 2968 | |
2969 | /* If we are converting an integer to a floating-point that can | |
2970 | represent it exactly and back to an integer, we can skip the | |
2971 | floating-point conversion. */ | |
2972 | if (inside_int && inter_float && final_int && | |
2973 | (unsigned) significand_size (TYPE_MODE (inter_type)) | |
2974 | >= inside_prec - !inside_unsignedp) | |
2975 | { | |
2976 | if (useless_type_conversion_p (type, inside_type)) | |
2977 | { | |
2978 | gimple_assign_set_rhs1 (stmt, unshare_expr (defop0)); | |
2979 | gimple_assign_set_rhs_code (stmt, TREE_CODE (defop0)); | |
2980 | update_stmt (stmt); | |
2981 | return remove_prop_source_from_use (op0) ? 2 : 1; | |
2982 | } | |
2983 | else | |
2984 | { | |
2985 | gimple_assign_set_rhs1 (stmt, defop0); | |
2986 | gimple_assign_set_rhs_code (stmt, CONVERT_EXPR); | |
2987 | update_stmt (stmt); | |
2988 | return remove_prop_source_from_use (op0) ? 2 : 1; | |
2989 | } | |
2990 | } | |
6afd0544 | 2991 | } |
2992 | ||
89c8f35a | 2993 | return 0; |
6afd0544 | 2994 | } |
2995 | ||
173c91d9 | 2996 | /* Combine an element access with a shuffle. Returns true if there were |
2997 | any changes made, else it returns false. */ | |
2998 | ||
2999 | static bool | |
3000 | simplify_bitfield_ref (gimple_stmt_iterator *gsi) | |
3001 | { | |
3002 | gimple stmt = gsi_stmt (*gsi); | |
3003 | gimple def_stmt; | |
3004 | tree op, op0, op1, op2; | |
3005 | tree elem_type; | |
3006 | unsigned idx, n, size; | |
3007 | enum tree_code code; | |
3008 | ||
3009 | op = gimple_assign_rhs1 (stmt); | |
3010 | gcc_checking_assert (TREE_CODE (op) == BIT_FIELD_REF); | |
3011 | ||
3012 | op0 = TREE_OPERAND (op, 0); | |
3013 | if (TREE_CODE (op0) != SSA_NAME | |
3014 | || TREE_CODE (TREE_TYPE (op0)) != VECTOR_TYPE) | |
3015 | return false; | |
3016 | ||
58bf5219 | 3017 | def_stmt = get_prop_source_stmt (op0, false, NULL); |
3018 | if (!def_stmt || !can_propagate_from (def_stmt)) | |
3019 | return false; | |
3020 | ||
3021 | op1 = TREE_OPERAND (op, 1); | |
3022 | op2 = TREE_OPERAND (op, 2); | |
3023 | code = gimple_assign_rhs_code (def_stmt); | |
3024 | ||
3025 | if (code == CONSTRUCTOR) | |
3026 | { | |
3027 | tree tem = fold_ternary (BIT_FIELD_REF, TREE_TYPE (op), | |
3028 | gimple_assign_rhs1 (def_stmt), op1, op2); | |
3029 | if (!tem || !valid_gimple_rhs_p (tem)) | |
3030 | return false; | |
3031 | gimple_assign_set_rhs_from_tree (gsi, tem); | |
3032 | update_stmt (gsi_stmt (*gsi)); | |
3033 | return true; | |
3034 | } | |
3035 | ||
173c91d9 | 3036 | elem_type = TREE_TYPE (TREE_TYPE (op0)); |
3037 | if (TREE_TYPE (op) != elem_type) | |
3038 | return false; | |
3039 | ||
e913b5cd | 3040 | size = tree_to_hwi (TYPE_SIZE (elem_type)); |
3041 | n = tree_to_hwi (op1) / size; | |
173c91d9 | 3042 | if (n != 1) |
3043 | return false; | |
e913b5cd | 3044 | idx = tree_to_hwi (op2) / size; |
173c91d9 | 3045 | |
173c91d9 | 3046 | if (code == VEC_PERM_EXPR) |
3047 | { | |
3048 | tree p, m, index, tem; | |
3049 | unsigned nelts; | |
3050 | m = gimple_assign_rhs3 (def_stmt); | |
3051 | if (TREE_CODE (m) != VECTOR_CST) | |
3052 | return false; | |
3053 | nelts = VECTOR_CST_NELTS (m); | |
e913b5cd | 3054 | idx = tree_to_hwi (VECTOR_CST_ELT (m, idx)); |
173c91d9 | 3055 | idx %= 2 * nelts; |
3056 | if (idx < nelts) | |
3057 | { | |
3058 | p = gimple_assign_rhs1 (def_stmt); | |
3059 | } | |
3060 | else | |
3061 | { | |
3062 | p = gimple_assign_rhs2 (def_stmt); | |
3063 | idx -= nelts; | |
3064 | } | |
3065 | index = build_int_cst (TREE_TYPE (TREE_TYPE (m)), idx * size); | |
3066 | tem = build3 (BIT_FIELD_REF, TREE_TYPE (op), | |
ab54bbbd | 3067 | unshare_expr (p), op1, index); |
173c91d9 | 3068 | gimple_assign_set_rhs1 (stmt, tem); |
3069 | fold_stmt (gsi); | |
3070 | update_stmt (gsi_stmt (*gsi)); | |
3071 | return true; | |
3072 | } | |
3073 | ||
3074 | return false; | |
3075 | } | |
3076 | ||
496ec2ad | 3077 | /* Determine whether applying the 2 permutations (mask1 then mask2) |
3078 | gives back one of the input. */ | |
3079 | ||
3080 | static int | |
3081 | is_combined_permutation_identity (tree mask1, tree mask2) | |
3082 | { | |
3083 | tree mask; | |
3084 | unsigned int nelts, i, j; | |
3085 | bool maybe_identity1 = true; | |
3086 | bool maybe_identity2 = true; | |
3087 | ||
3088 | gcc_checking_assert (TREE_CODE (mask1) == VECTOR_CST | |
3089 | && TREE_CODE (mask2) == VECTOR_CST); | |
3090 | mask = fold_ternary (VEC_PERM_EXPR, TREE_TYPE (mask1), mask1, mask1, mask2); | |
3091 | gcc_assert (TREE_CODE (mask) == VECTOR_CST); | |
3092 | ||
3093 | nelts = VECTOR_CST_NELTS (mask); | |
3094 | for (i = 0; i < nelts; i++) | |
3095 | { | |
3096 | tree val = VECTOR_CST_ELT (mask, i); | |
3097 | gcc_assert (TREE_CODE (val) == INTEGER_CST); | |
e913b5cd | 3098 | j = tree_to_hwi (val) & (2 * nelts - 1); |
496ec2ad | 3099 | if (j == i) |
3100 | maybe_identity2 = false; | |
3101 | else if (j == i + nelts) | |
3102 | maybe_identity1 = false; | |
3103 | else | |
3104 | return 0; | |
3105 | } | |
3106 | return maybe_identity1 ? 1 : maybe_identity2 ? 2 : 0; | |
3107 | } | |
3108 | ||
2b9112d6 | 3109 | /* Combine a shuffle with its arguments. Returns 1 if there were any |
3110 | changes made, 2 if cfg-cleanup needs to run. Else it returns 0. */ | |
496ec2ad | 3111 | |
3112 | static int | |
3113 | simplify_permutation (gimple_stmt_iterator *gsi) | |
3114 | { | |
3115 | gimple stmt = gsi_stmt (*gsi); | |
3116 | gimple def_stmt; | |
2b9112d6 | 3117 | tree op0, op1, op2, op3, arg0, arg1; |
3118 | enum tree_code code; | |
ab54bbbd | 3119 | bool single_use_op0 = false; |
496ec2ad | 3120 | |
2b9112d6 | 3121 | gcc_checking_assert (gimple_assign_rhs_code (stmt) == VEC_PERM_EXPR); |
496ec2ad | 3122 | |
3123 | op0 = gimple_assign_rhs1 (stmt); | |
3124 | op1 = gimple_assign_rhs2 (stmt); | |
3125 | op2 = gimple_assign_rhs3 (stmt); | |
3126 | ||
496ec2ad | 3127 | if (TREE_CODE (op2) != VECTOR_CST) |
3128 | return 0; | |
3129 | ||
2b9112d6 | 3130 | if (TREE_CODE (op0) == VECTOR_CST) |
3131 | { | |
3132 | code = VECTOR_CST; | |
3133 | arg0 = op0; | |
3134 | } | |
3135 | else if (TREE_CODE (op0) == SSA_NAME) | |
3136 | { | |
ab54bbbd | 3137 | def_stmt = get_prop_source_stmt (op0, false, &single_use_op0); |
3138 | if (!def_stmt || !can_propagate_from (def_stmt)) | |
2b9112d6 | 3139 | return 0; |
496ec2ad | 3140 | |
2b9112d6 | 3141 | code = gimple_assign_rhs_code (def_stmt); |
3142 | arg0 = gimple_assign_rhs1 (def_stmt); | |
3143 | } | |
3144 | else | |
496ec2ad | 3145 | return 0; |
3146 | ||
496ec2ad | 3147 | /* Two consecutive shuffles. */ |
2b9112d6 | 3148 | if (code == VEC_PERM_EXPR) |
496ec2ad | 3149 | { |
3150 | tree orig; | |
3151 | int ident; | |
2b9112d6 | 3152 | |
3153 | if (op0 != op1) | |
3154 | return 0; | |
496ec2ad | 3155 | op3 = gimple_assign_rhs3 (def_stmt); |
3156 | if (TREE_CODE (op3) != VECTOR_CST) | |
3157 | return 0; | |
3158 | ident = is_combined_permutation_identity (op3, op2); | |
3159 | if (!ident) | |
3160 | return 0; | |
3161 | orig = (ident == 1) ? gimple_assign_rhs1 (def_stmt) | |
3162 | : gimple_assign_rhs2 (def_stmt); | |
3163 | gimple_assign_set_rhs1 (stmt, unshare_expr (orig)); | |
3164 | gimple_assign_set_rhs_code (stmt, TREE_CODE (orig)); | |
3165 | gimple_set_num_ops (stmt, 2); | |
3166 | update_stmt (stmt); | |
3167 | return remove_prop_source_from_use (op0) ? 2 : 1; | |
3168 | } | |
3169 | ||
2b9112d6 | 3170 | /* Shuffle of a constructor. */ |
3171 | else if (code == CONSTRUCTOR || code == VECTOR_CST) | |
3172 | { | |
3173 | tree opt; | |
3174 | bool ret = false; | |
3175 | if (op0 != op1) | |
3176 | { | |
ab54bbbd | 3177 | if (TREE_CODE (op0) == SSA_NAME && !single_use_op0) |
2b9112d6 | 3178 | return 0; |
3179 | ||
3180 | if (TREE_CODE (op1) == VECTOR_CST) | |
3181 | arg1 = op1; | |
3182 | else if (TREE_CODE (op1) == SSA_NAME) | |
3183 | { | |
3184 | enum tree_code code2; | |
3185 | ||
ab54bbbd | 3186 | gimple def_stmt2 = get_prop_source_stmt (op1, true, NULL); |
3187 | if (!def_stmt2 || !can_propagate_from (def_stmt2)) | |
2b9112d6 | 3188 | return 0; |
3189 | ||
3190 | code2 = gimple_assign_rhs_code (def_stmt2); | |
3191 | if (code2 != CONSTRUCTOR && code2 != VECTOR_CST) | |
3192 | return 0; | |
3193 | arg1 = gimple_assign_rhs1 (def_stmt2); | |
3194 | } | |
3195 | else | |
3196 | return 0; | |
3197 | } | |
3198 | else | |
3199 | { | |
3200 | /* Already used twice in this statement. */ | |
3201 | if (TREE_CODE (op0) == SSA_NAME && num_imm_uses (op0) > 2) | |
3202 | return 0; | |
3203 | arg1 = arg0; | |
3204 | } | |
9af5ce0c | 3205 | opt = fold_ternary (VEC_PERM_EXPR, TREE_TYPE (op0), arg0, arg1, op2); |
2b9112d6 | 3206 | if (!opt |
9af5ce0c | 3207 | || (TREE_CODE (opt) != CONSTRUCTOR && TREE_CODE (opt) != VECTOR_CST)) |
2b9112d6 | 3208 | return 0; |
3209 | gimple_assign_set_rhs_from_tree (gsi, opt); | |
3210 | update_stmt (gsi_stmt (*gsi)); | |
3211 | if (TREE_CODE (op0) == SSA_NAME) | |
3212 | ret = remove_prop_source_from_use (op0); | |
3213 | if (op0 != op1 && TREE_CODE (op1) == SSA_NAME) | |
3214 | ret |= remove_prop_source_from_use (op1); | |
3215 | return ret ? 2 : 1; | |
3216 | } | |
3217 | ||
3218 | return 0; | |
496ec2ad | 3219 | } |
3220 | ||
6a9e13a2 | 3221 | /* Recognize a VEC_PERM_EXPR. Returns true if there were any changes. */ |
3222 | ||
3223 | static bool | |
3224 | simplify_vector_constructor (gimple_stmt_iterator *gsi) | |
3225 | { | |
3226 | gimple stmt = gsi_stmt (*gsi); | |
3227 | gimple def_stmt; | |
3228 | tree op, op2, orig, type, elem_type; | |
3229 | unsigned elem_size, nelts, i; | |
3230 | enum tree_code code; | |
3231 | constructor_elt *elt; | |
3232 | unsigned char *sel; | |
3233 | bool maybe_ident; | |
3234 | ||
3235 | gcc_checking_assert (gimple_assign_rhs_code (stmt) == CONSTRUCTOR); | |
3236 | ||
3237 | op = gimple_assign_rhs1 (stmt); | |
3238 | type = TREE_TYPE (op); | |
3239 | gcc_checking_assert (TREE_CODE (type) == VECTOR_TYPE); | |
3240 | ||
3241 | nelts = TYPE_VECTOR_SUBPARTS (type); | |
3242 | elem_type = TREE_TYPE (type); | |
e913b5cd | 3243 | elem_size = tree_to_hwi (TYPE_SIZE (elem_type)); |
6a9e13a2 | 3244 | |
3245 | sel = XALLOCAVEC (unsigned char, nelts); | |
3246 | orig = NULL; | |
3247 | maybe_ident = true; | |
f1f41a6c | 3248 | FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (op), i, elt) |
6a9e13a2 | 3249 | { |
3250 | tree ref, op1; | |
3251 | ||
3252 | if (i >= nelts) | |
3253 | return false; | |
3254 | ||
3255 | if (TREE_CODE (elt->value) != SSA_NAME) | |
3256 | return false; | |
ab54bbbd | 3257 | def_stmt = get_prop_source_stmt (elt->value, false, NULL); |
3258 | if (!def_stmt) | |
6a9e13a2 | 3259 | return false; |
3260 | code = gimple_assign_rhs_code (def_stmt); | |
3261 | if (code != BIT_FIELD_REF) | |
3262 | return false; | |
3263 | op1 = gimple_assign_rhs1 (def_stmt); | |
3264 | ref = TREE_OPERAND (op1, 0); | |
3265 | if (orig) | |
3266 | { | |
3267 | if (ref != orig) | |
3268 | return false; | |
3269 | } | |
3270 | else | |
3271 | { | |
3272 | if (TREE_CODE (ref) != SSA_NAME) | |
3273 | return false; | |
8a13ba5e | 3274 | if (!useless_type_conversion_p (type, TREE_TYPE (ref))) |
3275 | return false; | |
6a9e13a2 | 3276 | orig = ref; |
3277 | } | |
e913b5cd | 3278 | if (tree_to_hwi (TREE_OPERAND (op1, 1)) != elem_size) |
6a9e13a2 | 3279 | return false; |
e913b5cd | 3280 | sel[i] = tree_to_hwi (TREE_OPERAND (op1, 2)) / elem_size; |
6a9e13a2 | 3281 | if (sel[i] != i) maybe_ident = false; |
3282 | } | |
3283 | if (i < nelts) | |
3284 | return false; | |
3285 | ||
3286 | if (maybe_ident) | |
d1938a4b | 3287 | gimple_assign_set_rhs_from_tree (gsi, orig); |
6a9e13a2 | 3288 | else |
3289 | { | |
d1938a4b | 3290 | tree mask_type, *mask_elts; |
3291 | ||
3292 | if (!can_vec_perm_p (TYPE_MODE (type), false, sel)) | |
3293 | return false; | |
3294 | mask_type | |
3295 | = build_vector_type (build_nonstandard_integer_type (elem_size, 1), | |
3296 | nelts); | |
3297 | if (GET_MODE_CLASS (TYPE_MODE (mask_type)) != MODE_VECTOR_INT | |
3298 | || GET_MODE_SIZE (TYPE_MODE (mask_type)) | |
3299 | != GET_MODE_SIZE (TYPE_MODE (type))) | |
6a9e13a2 | 3300 | return false; |
d1938a4b | 3301 | mask_elts = XALLOCAVEC (tree, nelts); |
3302 | for (i = 0; i < nelts; i++) | |
3303 | mask_elts[i] = build_int_cst (TREE_TYPE (mask_type), sel[i]); | |
3304 | op2 = build_vector (mask_type, mask_elts); | |
6a9e13a2 | 3305 | gimple_assign_set_rhs_with_ops_1 (gsi, VEC_PERM_EXPR, orig, orig, op2); |
3306 | } | |
3307 | update_stmt (gsi_stmt (*gsi)); | |
3308 | return true; | |
3309 | } | |
3310 | ||
678b2f5b | 3311 | /* Main entry point for the forward propagation and statement combine |
3312 | optimizer. */ | |
4ee9c684 | 3313 | |
2a1990e9 | 3314 | static unsigned int |
678b2f5b | 3315 | ssa_forward_propagate_and_combine (void) |
4ee9c684 | 3316 | { |
f5c8cff5 | 3317 | basic_block bb; |
c96420f8 | 3318 | unsigned int todoflags = 0; |
4ee9c684 | 3319 | |
148aa112 | 3320 | cfg_changed = false; |
3321 | ||
f5c8cff5 | 3322 | FOR_EACH_BB (bb) |
3323 | { | |
2f5a3c4a | 3324 | gimple_stmt_iterator gsi; |
291d763b | 3325 | |
678b2f5b | 3326 | /* Apply forward propagation to all stmts in the basic-block. |
3327 | Note we update GSI within the loop as necessary. */ | |
75a70cf9 | 3328 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); ) |
291d763b | 3329 | { |
75a70cf9 | 3330 | gimple stmt = gsi_stmt (gsi); |
678b2f5b | 3331 | tree lhs, rhs; |
3332 | enum tree_code code; | |
291d763b | 3333 | |
678b2f5b | 3334 | if (!is_gimple_assign (stmt)) |
291d763b | 3335 | { |
678b2f5b | 3336 | gsi_next (&gsi); |
3337 | continue; | |
3338 | } | |
3a938499 | 3339 | |
678b2f5b | 3340 | lhs = gimple_assign_lhs (stmt); |
3341 | rhs = gimple_assign_rhs1 (stmt); | |
3342 | code = gimple_assign_rhs_code (stmt); | |
3343 | if (TREE_CODE (lhs) != SSA_NAME | |
3344 | || has_zero_uses (lhs)) | |
3345 | { | |
3346 | gsi_next (&gsi); | |
3347 | continue; | |
3348 | } | |
3a938499 | 3349 | |
678b2f5b | 3350 | /* If this statement sets an SSA_NAME to an address, |
3351 | try to propagate the address into the uses of the SSA_NAME. */ | |
3352 | if (code == ADDR_EXPR | |
3353 | /* Handle pointer conversions on invariant addresses | |
3354 | as well, as this is valid gimple. */ | |
3355 | || (CONVERT_EXPR_CODE_P (code) | |
3356 | && TREE_CODE (rhs) == ADDR_EXPR | |
3357 | && POINTER_TYPE_P (TREE_TYPE (lhs)))) | |
3358 | { | |
3359 | tree base = get_base_address (TREE_OPERAND (rhs, 0)); | |
3360 | if ((!base | |
3361 | || !DECL_P (base) | |
3362 | || decl_address_invariant_p (base)) | |
3363 | && !stmt_references_abnormal_ssa_name (stmt) | |
bfb89138 | 3364 | && forward_propagate_addr_expr (lhs, rhs, true)) |
1c4607fd | 3365 | { |
678b2f5b | 3366 | release_defs (stmt); |
678b2f5b | 3367 | gsi_remove (&gsi, true); |
1c4607fd | 3368 | } |
678b2f5b | 3369 | else |
3370 | gsi_next (&gsi); | |
3371 | } | |
cd22a796 | 3372 | else if (code == POINTER_PLUS_EXPR) |
678b2f5b | 3373 | { |
cd22a796 | 3374 | tree off = gimple_assign_rhs2 (stmt); |
3375 | if (TREE_CODE (off) == INTEGER_CST | |
3376 | && can_propagate_from (stmt) | |
3377 | && !simple_iv_increment_p (stmt) | |
678b2f5b | 3378 | /* ??? Better adjust the interface to that function |
3379 | instead of building new trees here. */ | |
3380 | && forward_propagate_addr_expr | |
cd22a796 | 3381 | (lhs, |
3382 | build1_loc (gimple_location (stmt), | |
3383 | ADDR_EXPR, TREE_TYPE (rhs), | |
3384 | fold_build2 (MEM_REF, | |
3385 | TREE_TYPE (TREE_TYPE (rhs)), | |
3386 | rhs, | |
3387 | fold_convert (ptr_type_node, | |
bfb89138 | 3388 | off))), true)) |
ca3c9092 | 3389 | { |
678b2f5b | 3390 | release_defs (stmt); |
678b2f5b | 3391 | gsi_remove (&gsi, true); |
ca3c9092 | 3392 | } |
678b2f5b | 3393 | else if (is_gimple_min_invariant (rhs)) |
6afd0544 | 3394 | { |
678b2f5b | 3395 | /* Make sure to fold &a[0] + off_1 here. */ |
50aacf4c | 3396 | fold_stmt_inplace (&gsi); |
678b2f5b | 3397 | update_stmt (stmt); |
3398 | if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR) | |
6afd0544 | 3399 | gsi_next (&gsi); |
3400 | } | |
291d763b | 3401 | else |
75a70cf9 | 3402 | gsi_next (&gsi); |
291d763b | 3403 | } |
678b2f5b | 3404 | else if (TREE_CODE_CLASS (code) == tcc_comparison) |
b5860aba | 3405 | { |
e3a19533 | 3406 | if (forward_propagate_comparison (&gsi)) |
75200312 | 3407 | cfg_changed = true; |
b5860aba | 3408 | } |
291d763b | 3409 | else |
75a70cf9 | 3410 | gsi_next (&gsi); |
291d763b | 3411 | } |
678b2f5b | 3412 | |
3413 | /* Combine stmts with the stmts defining their operands. | |
3414 | Note we update GSI within the loop as necessary. */ | |
a7107e58 | 3415 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi);) |
678b2f5b | 3416 | { |
3417 | gimple stmt = gsi_stmt (gsi); | |
3418 | bool changed = false; | |
3419 | ||
2f5a3c4a | 3420 | /* Mark stmt as potentially needing revisiting. */ |
3421 | gimple_set_plf (stmt, GF_PLF_1, false); | |
3422 | ||
678b2f5b | 3423 | switch (gimple_code (stmt)) |
3424 | { | |
3425 | case GIMPLE_ASSIGN: | |
3426 | { | |
3427 | tree rhs1 = gimple_assign_rhs1 (stmt); | |
3428 | enum tree_code code = gimple_assign_rhs_code (stmt); | |
3429 | ||
3430 | if ((code == BIT_NOT_EXPR | |
3431 | || code == NEGATE_EXPR) | |
3432 | && TREE_CODE (rhs1) == SSA_NAME) | |
3433 | changed = simplify_not_neg_expr (&gsi); | |
360b78f3 | 3434 | else if (code == COND_EXPR |
3435 | || code == VEC_COND_EXPR) | |
678b2f5b | 3436 | { |
3437 | /* In this case the entire COND_EXPR is in rhs1. */ | |
11b881f5 | 3438 | if (forward_propagate_into_cond (&gsi) |
3439 | || combine_cond_exprs (&gsi)) | |
3440 | { | |
3441 | changed = true; | |
3442 | stmt = gsi_stmt (gsi); | |
3443 | } | |
678b2f5b | 3444 | } |
3445 | else if (TREE_CODE_CLASS (code) == tcc_comparison) | |
3446 | { | |
6f9714b3 | 3447 | int did_something; |
6f9714b3 | 3448 | did_something = forward_propagate_into_comparison (&gsi); |
3449 | if (did_something == 2) | |
3450 | cfg_changed = true; | |
6f9714b3 | 3451 | changed = did_something != 0; |
678b2f5b | 3452 | } |
3b8827a2 | 3453 | else if ((code == PLUS_EXPR |
3454 | || code == BIT_IOR_EXPR | |
3455 | || code == BIT_XOR_EXPR) | |
3456 | && simplify_rotate (&gsi)) | |
3457 | changed = true; | |
678b2f5b | 3458 | else if (code == BIT_AND_EXPR |
3459 | || code == BIT_IOR_EXPR | |
3460 | || code == BIT_XOR_EXPR) | |
3461 | changed = simplify_bitwise_binary (&gsi); | |
3462 | else if (code == PLUS_EXPR | |
3463 | || code == MINUS_EXPR) | |
50aacf4c | 3464 | changed = associate_plusminus (&gsi); |
c9c17332 | 3465 | else if (code == POINTER_PLUS_EXPR) |
3466 | changed = associate_pointerplus (&gsi); | |
678b2f5b | 3467 | else if (CONVERT_EXPR_CODE_P (code) |
3468 | || code == FLOAT_EXPR | |
3469 | || code == FIX_TRUNC_EXPR) | |
89c8f35a | 3470 | { |
3471 | int did_something = combine_conversions (&gsi); | |
3472 | if (did_something == 2) | |
3473 | cfg_changed = true; | |
d23e1965 | 3474 | |
3475 | /* If we have a narrowing conversion to an integral | |
3476 | type that is fed by a BIT_AND_EXPR, we might be | |
3477 | able to remove the BIT_AND_EXPR if it merely | |
3478 | masks off bits outside the final type (and nothing | |
3479 | else. */ | |
3480 | if (! did_something) | |
3481 | { | |
3482 | tree outer_type = TREE_TYPE (gimple_assign_lhs (stmt)); | |
3483 | tree inner_type = TREE_TYPE (gimple_assign_rhs1 (stmt)); | |
3484 | if (INTEGRAL_TYPE_P (outer_type) | |
3485 | && INTEGRAL_TYPE_P (inner_type) | |
3486 | && (TYPE_PRECISION (outer_type) | |
3487 | <= TYPE_PRECISION (inner_type))) | |
3488 | did_something = simplify_conversion_from_bitmask (&gsi); | |
3489 | } | |
3490 | ||
89c8f35a | 3491 | changed = did_something != 0; |
3492 | } | |
496ec2ad | 3493 | else if (code == VEC_PERM_EXPR) |
3494 | { | |
3495 | int did_something = simplify_permutation (&gsi); | |
3496 | if (did_something == 2) | |
3497 | cfg_changed = true; | |
3498 | changed = did_something != 0; | |
3499 | } | |
173c91d9 | 3500 | else if (code == BIT_FIELD_REF) |
3501 | changed = simplify_bitfield_ref (&gsi); | |
6a9e13a2 | 3502 | else if (code == CONSTRUCTOR |
3503 | && TREE_CODE (TREE_TYPE (rhs1)) == VECTOR_TYPE) | |
3504 | changed = simplify_vector_constructor (&gsi); | |
678b2f5b | 3505 | break; |
3506 | } | |
3507 | ||
3508 | case GIMPLE_SWITCH: | |
3509 | changed = simplify_gimple_switch (stmt); | |
3510 | break; | |
3511 | ||
3512 | case GIMPLE_COND: | |
3513 | { | |
3514 | int did_something; | |
678b2f5b | 3515 | did_something = forward_propagate_into_gimple_cond (stmt); |
3516 | if (did_something == 2) | |
3517 | cfg_changed = true; | |
678b2f5b | 3518 | changed = did_something != 0; |
3519 | break; | |
3520 | } | |
3521 | ||
3522 | case GIMPLE_CALL: | |
3523 | { | |
3524 | tree callee = gimple_call_fndecl (stmt); | |
3525 | if (callee != NULL_TREE | |
3526 | && DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL) | |
3527 | changed = simplify_builtin_call (&gsi, callee); | |
3528 | break; | |
3529 | } | |
3530 | ||
3531 | default:; | |
3532 | } | |
3533 | ||
a7107e58 | 3534 | if (changed) |
3535 | { | |
3536 | /* If the stmt changed then re-visit it and the statements | |
3537 | inserted before it. */ | |
2f5a3c4a | 3538 | for (; !gsi_end_p (gsi); gsi_prev (&gsi)) |
3539 | if (gimple_plf (gsi_stmt (gsi), GF_PLF_1)) | |
3540 | break; | |
3541 | if (gsi_end_p (gsi)) | |
a7107e58 | 3542 | gsi = gsi_start_bb (bb); |
3543 | else | |
2f5a3c4a | 3544 | gsi_next (&gsi); |
a7107e58 | 3545 | } |
3546 | else | |
3547 | { | |
2f5a3c4a | 3548 | /* Stmt no longer needs to be revisited. */ |
3549 | gimple_set_plf (stmt, GF_PLF_1, true); | |
a7107e58 | 3550 | gsi_next (&gsi); |
3551 | } | |
678b2f5b | 3552 | } |
f5c8cff5 | 3553 | } |
148aa112 | 3554 | |
3555 | if (cfg_changed) | |
6fa78c7b | 3556 | todoflags |= TODO_cleanup_cfg; |
678b2f5b | 3557 | |
c96420f8 | 3558 | return todoflags; |
4ee9c684 | 3559 | } |
3560 | ||
3561 | ||
3562 | static bool | |
3563 | gate_forwprop (void) | |
3564 | { | |
408c3c77 | 3565 | return flag_tree_forwprop; |
4ee9c684 | 3566 | } |
3567 | ||
cbe8bda8 | 3568 | namespace { |
3569 | ||
3570 | const pass_data pass_data_forwprop = | |
20099e35 | 3571 | { |
cbe8bda8 | 3572 | GIMPLE_PASS, /* type */ |
3573 | "forwprop", /* name */ | |
3574 | OPTGROUP_NONE, /* optinfo_flags */ | |
3575 | true, /* has_gate */ | |
3576 | true, /* has_execute */ | |
3577 | TV_TREE_FORWPROP, /* tv_id */ | |
3578 | ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
3579 | 0, /* properties_provided */ | |
3580 | 0, /* properties_destroyed */ | |
3581 | 0, /* todo_flags_start */ | |
3582 | ( TODO_update_ssa | TODO_verify_ssa ), /* todo_flags_finish */ | |
4ee9c684 | 3583 | }; |
cbe8bda8 | 3584 | |
3585 | class pass_forwprop : public gimple_opt_pass | |
3586 | { | |
3587 | public: | |
9af5ce0c | 3588 | pass_forwprop (gcc::context *ctxt) |
3589 | : gimple_opt_pass (pass_data_forwprop, ctxt) | |
cbe8bda8 | 3590 | {} |
3591 | ||
3592 | /* opt_pass methods: */ | |
ae84f584 | 3593 | opt_pass * clone () { return new pass_forwprop (m_ctxt); } |
cbe8bda8 | 3594 | bool gate () { return gate_forwprop (); } |
3595 | unsigned int execute () { return ssa_forward_propagate_and_combine (); } | |
3596 | ||
3597 | }; // class pass_forwprop | |
3598 | ||
3599 | } // anon namespace | |
3600 | ||
3601 | gimple_opt_pass * | |
3602 | make_pass_forwprop (gcc::context *ctxt) | |
3603 | { | |
3604 | return new pass_forwprop (ctxt); | |
3605 | } |