Line data Source code
1 : /* Interprocedural Identical Code Folding pass
2 : Copyright (C) 2014-2026 Free Software Foundation, Inc.
3 :
4 : Contributed by Jan Hubicka <hubicka@ucw.cz> and Martin Liska <mliska@suse.cz>
5 :
6 : This file is part of GCC.
7 :
8 : GCC is free software; you can redistribute it and/or modify it under
9 : the terms of the GNU General Public License as published by the Free
10 : Software Foundation; either version 3, or (at your option) any later
11 : version.
12 :
13 : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 : WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 : FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 : for more details.
17 :
18 : You should have received a copy of the GNU General Public License
19 : along with GCC; see the file COPYING3. If not see
20 : <http://www.gnu.org/licenses/>. */
21 :
22 : #include "config.h"
23 : #include "system.h"
24 : #include "coretypes.h"
25 : #include "backend.h"
26 : #include "rtl.h"
27 : #include "tree.h"
28 : #include "gimple.h"
29 : #include "tree-pass.h"
30 : #include "ssa.h"
31 : #include "cgraph.h"
32 : #include "data-streamer.h"
33 : #include "gimple-pretty-print.h"
34 : #include "fold-const.h"
35 : #include "gimple-iterator.h"
36 : #include "ipa-utils.h"
37 : #include "tree-eh.h"
38 : #include "builtins.h"
39 : #include "cfgloop.h"
40 : #include "attribs.h"
41 : #include "gimple-walk.h"
42 : #include "tree-sra.h"
43 :
44 : #include "tree-ssa-alias-compare.h"
45 : #include "alloc-pool.h"
46 : #include "symbol-summary.h"
47 : #include "ipa-icf-gimple.h"
48 : #include "sreal.h"
49 : #include "ipa-cp.h"
50 : #include "ipa-prop.h"
51 :
52 : namespace ipa_icf_gimple {
53 :
54 : /* Initialize internal structures for a given SOURCE_FUNC_DECL and
55 : TARGET_FUNC_DECL. Strict polymorphic comparison is processed if
56 : an option COMPARE_POLYMORPHIC is true. For special cases, one can
57 : set IGNORE_LABELS to skip label comparison.
58 : Similarly, IGNORE_SOURCE_DECLS and IGNORE_TARGET_DECLS are sets
59 : of declarations that can be skipped. */
60 :
61 124566 : func_checker::func_checker (tree source_func_decl, tree target_func_decl,
62 : bool ignore_labels, bool tbaa,
63 : hash_set<symtab_node *> *ignored_source_nodes,
64 124566 : hash_set<symtab_node *> *ignored_target_nodes)
65 124566 : : m_source_func_decl (source_func_decl), m_target_func_decl (target_func_decl),
66 124566 : m_ignored_source_nodes (ignored_source_nodes),
67 124566 : m_ignored_target_nodes (ignored_target_nodes),
68 124566 : m_ignore_labels (ignore_labels), m_tbaa (tbaa),
69 124566 : m_total_scalarization_limit_known_p (false)
70 : {
71 124566 : function *source_func = DECL_STRUCT_FUNCTION (source_func_decl);
72 124566 : function *target_func = DECL_STRUCT_FUNCTION (target_func_decl);
73 :
74 124566 : unsigned ssa_source = SSANAMES (source_func)->length ();
75 124566 : unsigned ssa_target = SSANAMES (target_func)->length ();
76 :
77 124566 : m_source_ssa_names.create (ssa_source);
78 124566 : m_target_ssa_names.create (ssa_target);
79 :
80 1089192 : for (unsigned i = 0; i < ssa_source; i++)
81 964626 : m_source_ssa_names.safe_push (-1);
82 :
83 1088796 : for (unsigned i = 0; i < ssa_target; i++)
84 964230 : m_target_ssa_names.safe_push (-1);
85 124566 : }
86 :
87 : /* Memory release routine. */
88 :
89 502036 : func_checker::~func_checker ()
90 : {
91 377470 : m_source_ssa_names.release();
92 377470 : m_target_ssa_names.release();
93 502036 : }
94 :
95 : /* Verifies that trees T1 and T2 are equivalent from perspective of ICF. */
96 :
97 : bool
98 1283925 : func_checker::compare_ssa_name (const_tree t1, const_tree t2)
99 : {
100 1283925 : gcc_assert (TREE_CODE (t1) == SSA_NAME);
101 1283925 : gcc_assert (TREE_CODE (t2) == SSA_NAME);
102 :
103 1283925 : unsigned i1 = SSA_NAME_VERSION (t1);
104 1283925 : unsigned i2 = SSA_NAME_VERSION (t2);
105 :
106 1283925 : if (SSA_NAME_IS_DEFAULT_DEF (t1) != SSA_NAME_IS_DEFAULT_DEF (t2))
107 : return false;
108 :
109 1283925 : if (m_source_ssa_names[i1] == -1)
110 368509 : m_source_ssa_names[i1] = i2;
111 915416 : else if (m_source_ssa_names[i1] != (int) i2)
112 : return false;
113 :
114 1283742 : if(m_target_ssa_names[i2] == -1)
115 368505 : m_target_ssa_names[i2] = i1;
116 915237 : else if (m_target_ssa_names[i2] != (int) i1)
117 : return false;
118 :
119 1283738 : if (SSA_NAME_IS_DEFAULT_DEF (t1))
120 : {
121 254852 : tree b1 = SSA_NAME_VAR (t1);
122 254852 : tree b2 = SSA_NAME_VAR (t2);
123 :
124 254852 : return compare_operand (b1, b2, OP_NORMAL);
125 : }
126 :
127 : return true;
128 : }
129 :
130 : /* Verification function for edges E1 and E2. */
131 :
132 : bool
133 543710 : func_checker::compare_edge (edge e1, edge e2)
134 : {
135 543710 : if (e1->flags != e2->flags)
136 : return false;
137 :
138 543710 : bool existed_p;
139 :
140 543710 : edge &slot = m_edge_map.get_or_insert (e1, &existed_p);
141 543710 : if (existed_p)
142 253505 : return return_with_debug (slot == e2);
143 : else
144 290205 : slot = e2;
145 :
146 : /* TODO: filter edge probabilities for profile feedback match. */
147 :
148 290205 : return true;
149 : }
150 :
151 : /* Verification function for declaration trees T1 and T2 that
152 : come from functions FUNC1 and FUNC2. */
153 :
154 : bool
155 506528 : func_checker::compare_decl (const_tree t1, const_tree t2)
156 : {
157 506528 : if (!auto_var_in_fn_p (t1, m_source_func_decl)
158 506528 : || !auto_var_in_fn_p (t2, m_target_func_decl))
159 6 : return return_with_debug (t1 == t2);
160 :
161 506522 : tree_code t = TREE_CODE (t1);
162 506522 : if ((t == VAR_DECL || t == PARM_DECL || t == RESULT_DECL)
163 506522 : && DECL_BY_REFERENCE (t1) != DECL_BY_REFERENCE (t2))
164 0 : return return_false_with_msg ("DECL_BY_REFERENCE flags are different");
165 :
166 : /* We do not really need to check types of variables, since they are just
167 : blocks of memory and we verify types of the accesses to them.
168 : However do compare types of other kinds of decls
169 : (parm decls and result decl types may affect ABI convetions). */
170 506522 : if (t != VAR_DECL)
171 : {
172 434666 : if (!compatible_types_p (TREE_TYPE (t1), TREE_TYPE (t2)))
173 0 : return return_false ();
174 : }
175 : else
176 : {
177 71856 : if (!operand_equal_p (DECL_SIZE (t1), DECL_SIZE (t2),
178 : OEP_MATCH_SIDE_EFFECTS))
179 0 : return return_false_with_msg ("DECL_SIZEs are different");
180 : }
181 :
182 506522 : bool existed_p;
183 506522 : const_tree &slot = m_decl_map.get_or_insert (t1, &existed_p);
184 506522 : if (existed_p)
185 329445 : return return_with_debug (slot == t2);
186 : else
187 177077 : slot = t2;
188 :
189 177077 : return true;
190 : }
191 :
192 : /* Return true if T1 and T2 are same for purposes of ipa-polymorphic-call
193 : analysis. COMPARE_PTR indicates if types of pointers needs to be
194 : considered. */
195 :
196 : bool
197 14344 : func_checker::compatible_polymorphic_types_p (tree t1, tree t2,
198 : bool compare_ptr)
199 : {
200 14344 : gcc_assert (TREE_CODE (t1) != FUNCTION_TYPE && TREE_CODE (t1) != METHOD_TYPE);
201 :
202 : /* Pointer types generally give no information. */
203 14344 : if (POINTER_TYPE_P (t1))
204 : {
205 0 : if (!compare_ptr)
206 : return true;
207 0 : return func_checker::compatible_polymorphic_types_p (TREE_TYPE (t1),
208 0 : TREE_TYPE (t2),
209 0 : false);
210 : }
211 :
212 : /* If types contain a polymorphic types, match them. */
213 14344 : bool c1 = contains_polymorphic_type_p (t1);
214 14344 : bool c2 = contains_polymorphic_type_p (t2);
215 14344 : if (!c1 && !c2)
216 : return true;
217 785 : if (!c1 || !c2)
218 0 : return return_false_with_msg ("one type is not polymorphic");
219 785 : if (!types_must_be_same_for_odr (t1, t2))
220 0 : return return_false_with_msg ("types are not same for ODR");
221 : return true;
222 : }
223 :
224 : /* Return true if types are compatible from perspective of ICF. */
225 : bool
226 4380574 : func_checker::compatible_types_p (tree t1, tree t2)
227 : {
228 4380574 : if (TREE_CODE (t1) != TREE_CODE (t2))
229 137915 : return return_false_with_msg ("different tree types");
230 :
231 4242659 : if (TYPE_RESTRICT (t1) != TYPE_RESTRICT (t2))
232 114 : return return_false_with_msg ("restrict flags are different");
233 :
234 4242545 : if (!types_compatible_p (t1, t2))
235 944646 : return return_false_with_msg ("types are not compatible");
236 :
237 : return true;
238 : }
239 :
240 : /* Add hash of ARG to HSTATE. FLAGS have same meaning
241 : as for operand_equal_p. Works only if operand acces type is OP_NORMAL. */
242 :
243 : void
244 132064604 : func_checker::hash_operand (const_tree arg, inchash::hash &hstate,
245 : unsigned int flags)
246 : {
247 136975949 : if (arg == NULL_TREE)
248 : {
249 15403941 : hstate.merge_hash (0);
250 15403941 : return;
251 : }
252 :
253 121572008 : switch (TREE_CODE (arg))
254 : {
255 5549939 : case PARM_DECL:
256 5549939 : {
257 5549939 : unsigned int index = 0;
258 5549939 : if (DECL_CONTEXT (arg))
259 5549939 : for (tree p = DECL_ARGUMENTS (DECL_CONTEXT (arg));
260 11166666 : p && index < 32; p = DECL_CHAIN (p), index++)
261 11157743 : if (p == arg)
262 : break;
263 5549939 : hstate.add_int (PARM_DECL);
264 5549939 : hstate.add_int (index);
265 : }
266 5549939 : return;
267 14343810 : case FUNCTION_DECL:
268 14343810 : case VAR_DECL:
269 14343810 : case LABEL_DECL:
270 14343810 : case RESULT_DECL:
271 14343810 : case CONST_DECL:
272 14343810 : hstate.add_int (TREE_CODE (arg));
273 14343810 : return;
274 33278779 : case SSA_NAME:
275 33278779 : hstate.add_int (SSA_NAME);
276 33278779 : if (SSA_NAME_IS_DEFAULT_DEF (arg))
277 4911345 : hash_operand (SSA_NAME_VAR (arg), hstate, flags);
278 : return;
279 237 : case FIELD_DECL:
280 237 : inchash::add_expr (DECL_FIELD_OFFSET (arg), hstate, flags);
281 237 : inchash::add_expr (DECL_FIELD_BIT_OFFSET (arg), hstate, flags);
282 237 : return;
283 68399243 : default:
284 68399243 : break;
285 : }
286 :
287 : /* In gimple all clobbers can be considered equal: while comparaing two
288 : gimple clobbers we match the left hand memory accesses. */
289 68399243 : if (TREE_CLOBBER_P (arg))
290 : {
291 1168417 : hstate.add_int (0xc10bbe5);
292 1168417 : return;
293 : }
294 67230826 : gcc_assert (!DECL_P (arg));
295 67230826 : gcc_assert (!TYPE_P (arg));
296 :
297 67230826 : return operand_compare::hash_operand (arg, hstate, flags);
298 : }
299 :
300 : /* Add hash of ARG accesses according to ACCESS to HSTATE.
301 : FLAGS have same meaning as for operand_equal_p. */
302 :
303 : void
304 64893469 : func_checker::hash_operand (const_tree arg, inchash::hash &hstate,
305 : unsigned int flags, operand_access_type access)
306 : {
307 64893469 : if (access == OP_MEMORY)
308 : {
309 8009637 : ao_ref ref;
310 8009637 : ao_ref_init (&ref, const_cast <tree> (arg));
311 8009637 : return hash_ao_ref (&ref, lto_streaming_expected_p (), m_tbaa, hstate);
312 : }
313 : else
314 56883832 : return hash_operand (arg, hstate, flags);
315 : }
316 :
317 : bool
318 5061647 : func_checker::operand_equal_p (const_tree t1, const_tree t2,
319 : unsigned int flags)
320 : {
321 5061647 : bool r;
322 5061647 : if (verify_hash_value (t1, t2, flags, &r))
323 2194427 : return r;
324 :
325 2867220 : if (t1 == t2)
326 : return true;
327 2157329 : else if (!t1 || !t2)
328 : return false;
329 :
330 2157329 : if (TREE_CODE (t1) != TREE_CODE (t2))
331 1 : return return_false ();
332 :
333 2157328 : switch (TREE_CODE (t1))
334 : {
335 : case FUNCTION_DECL:
336 : /* All function decls are in the symbol table and known to match
337 : before we start comparing bodies. */
338 : return true;
339 71880 : case VAR_DECL:
340 71880 : return return_with_debug (compare_variable_decl (t1, t2));
341 3638 : case LABEL_DECL:
342 3638 : {
343 3638 : int *bb1 = m_label_bb_map.get (t1);
344 3638 : int *bb2 = m_label_bb_map.get (t2);
345 : /* Labels can point to another function (non-local GOTOs). */
346 3643 : return return_with_debug (bb1 != NULL && bb2 != NULL && *bb1 == *bb2);
347 : }
348 :
349 270230 : case PARM_DECL:
350 270230 : case RESULT_DECL:
351 270230 : case CONST_DECL:
352 270230 : return compare_decl (t1, t2);
353 1283925 : case SSA_NAME:
354 1283925 : return compare_ssa_name (t1, t2);
355 515737 : default:
356 515737 : break;
357 : }
358 : /* In gimple all clobbers can be considered equal. We match the left hand
359 : memory accesses. */
360 515737 : if (TREE_CLOBBER_P (t1) || TREE_CLOBBER_P (t2))
361 22008 : return TREE_CLOBBER_P (t1) == TREE_CLOBBER_P (t2);
362 :
363 493729 : return operand_compare::operand_equal_p (t1, t2, flags);
364 : }
365 :
366 : /* Return true if either T1 and T2 cannot be totally scalarized or if doing
367 : so would result in copying the same memory. Otherwise return false. */
368 :
369 : bool
370 169859 : func_checker::safe_for_total_scalarization_p (tree t1, tree t2)
371 : {
372 169859 : tree type1 = TREE_TYPE (t1);
373 169859 : tree type2 = TREE_TYPE (t2);
374 :
375 169859 : if (!AGGREGATE_TYPE_P (type1)
376 37966 : || !AGGREGATE_TYPE_P (type2)
377 37966 : || !tree_fits_uhwi_p (TYPE_SIZE (type1))
378 207825 : || !tree_fits_uhwi_p (TYPE_SIZE (type2)))
379 : return true;
380 :
381 37966 : if (!m_total_scalarization_limit_known_p)
382 : {
383 7089 : push_cfun (DECL_STRUCT_FUNCTION (m_target_func_decl));
384 7089 : m_total_scalarization_limit = sra_get_max_scalarization_size ();
385 7089 : pop_cfun ();
386 7089 : m_total_scalarization_limit_known_p = true;
387 : }
388 :
389 37966 : unsigned HOST_WIDE_INT sz = tree_to_uhwi (TYPE_SIZE (type1));
390 37966 : gcc_assert (sz == tree_to_uhwi (TYPE_SIZE (type2)));
391 37966 : if (sz > m_total_scalarization_limit)
392 : return true;
393 37749 : return sra_total_scalarization_would_copy_same_data_p (type1, type2);
394 : }
395 :
396 : /* Function responsible for comparison of various operands T1 and T2
397 : which are accessed as ACCESS.
398 : If these components, from functions FUNC1 and FUNC2, are equal, true
399 : is returned. */
400 :
401 : bool
402 2523568 : func_checker::compare_operand (tree t1, tree t2, operand_access_type access)
403 : {
404 2523568 : if (!t1 && !t2)
405 : return true;
406 2105912 : else if (!t1 || !t2)
407 : return false;
408 2105912 : if (access == OP_MEMORY)
409 : {
410 172102 : ao_ref ref1, ref2;
411 172102 : ao_ref_init (&ref1, const_cast <tree> (t1));
412 172102 : ao_ref_init (&ref2, const_cast <tree> (t2));
413 344204 : int flags = compare_ao_refs (&ref1, &ref2,
414 172102 : lto_streaming_expected_p (), m_tbaa);
415 :
416 172102 : if (!flags)
417 : {
418 169859 : if (!safe_for_total_scalarization_p (t1, t2))
419 3 : return return_false_with_msg
420 : ("total scalarization may not be equivalent");
421 : return true;
422 : }
423 2243 : if (flags & SEMANTICS)
424 430 : return return_false_with_msg
425 : ("compare_ao_refs failed (semantic difference)");
426 1813 : if (flags & BASE_ALIAS_SET)
427 22 : return return_false_with_msg
428 : ("compare_ao_refs failed (base alias set difference)");
429 1791 : if (flags & REF_ALIAS_SET)
430 0 : return return_false_with_msg
431 : ("compare_ao_refs failed (ref alias set difference)");
432 1791 : if (flags & ACCESS_PATH)
433 1710 : return return_false_with_msg
434 : ("compare_ao_refs failed (access path difference)");
435 81 : if (flags & DEPENDENCE_CLIQUE)
436 81 : return return_false_with_msg
437 : ("compare_ao_refs failed (dependence clique difference)");
438 0 : gcc_unreachable ();
439 : }
440 : else
441 : {
442 1933810 : if (operand_equal_p (t1, t2, OEP_MATCH_SIDE_EFFECTS))
443 : return true;
444 282 : return return_false_with_msg
445 : ("operand_equal_p failed");
446 : }
447 : }
448 :
449 : bool
450 919 : func_checker::compare_asm_inputs_outputs (tree t1, tree t2,
451 : operand_access_type_map *map)
452 : {
453 919 : gcc_assert (TREE_CODE (t1) == TREE_LIST);
454 919 : gcc_assert (TREE_CODE (t2) == TREE_LIST);
455 :
456 1809 : for (; t1; t1 = TREE_CHAIN (t1))
457 : {
458 919 : if (!t2)
459 : return false;
460 :
461 919 : if (!compare_operand (TREE_VALUE (t1), TREE_VALUE (t2),
462 : get_operand_access_type (map, t1))
463 1834 : || !types_compatible_p (TREE_TYPE (TREE_VALUE (t1)),
464 915 : TREE_TYPE (TREE_VALUE (t2))))
465 6 : return return_false ();
466 :
467 913 : tree p1 = TREE_PURPOSE (t1);
468 913 : tree p2 = TREE_PURPOSE (t2);
469 :
470 913 : gcc_assert (TREE_CODE (p1) == TREE_LIST);
471 913 : gcc_assert (TREE_CODE (p2) == TREE_LIST);
472 :
473 913 : if (strcmp (TREE_STRING_POINTER (TREE_VALUE (p1)),
474 913 : TREE_STRING_POINTER (TREE_VALUE (p2))) != 0)
475 23 : return return_false ();
476 :
477 890 : t2 = TREE_CHAIN (t2);
478 : }
479 :
480 890 : if (t2)
481 0 : return return_false ();
482 :
483 : return true;
484 : }
485 :
486 : /* Verifies that trees T1 and T2 do correspond. */
487 :
488 : bool
489 467103 : func_checker::compare_variable_decl (const_tree t1, const_tree t2)
490 : {
491 467103 : bool ret = false;
492 :
493 467103 : if (t1 == t2)
494 : return true;
495 :
496 71888 : if (DECL_ALIGN (t1) != DECL_ALIGN (t2))
497 6 : return return_false_with_msg ("alignments are different");
498 :
499 71882 : if (DECL_HARD_REGISTER (t1) != DECL_HARD_REGISTER (t2))
500 0 : return return_false_with_msg ("DECL_HARD_REGISTER are different");
501 :
502 71882 : if (DECL_HARD_REGISTER (t1)
503 71882 : && DECL_ASSEMBLER_NAME_RAW (t1) != DECL_ASSEMBLER_NAME_RAW (t2))
504 8 : return return_false_with_msg ("HARD REGISTERS are different");
505 :
506 : /* Symbol table variables are known to match before we start comparing
507 : bodies. */
508 71874 : if (decl_in_symtab_p (t1))
509 18 : return decl_in_symtab_p (t2);
510 71856 : ret = compare_decl (t1, t2);
511 :
512 71856 : return return_with_debug (ret);
513 : }
514 :
515 : /* Compare loop information for basic blocks BB1 and BB2. */
516 :
517 : bool
518 395390 : func_checker::compare_loops (basic_block bb1, basic_block bb2)
519 : {
520 395390 : if ((bb1->loop_father == NULL) != (bb2->loop_father == NULL))
521 0 : return return_false ();
522 :
523 395390 : class loop *l1 = bb1->loop_father;
524 395390 : class loop *l2 = bb2->loop_father;
525 395390 : if (l1 == NULL)
526 : return true;
527 :
528 395390 : if ((bb1 == l1->header) != (bb2 == l2->header))
529 0 : return return_false_with_msg ("header");
530 395390 : if ((bb1 == l1->latch) != (bb2 == l2->latch))
531 0 : return return_false_with_msg ("latch");
532 395390 : if (l1->simdlen != l2->simdlen)
533 5 : return return_false_with_msg ("simdlen");
534 395385 : if (l1->safelen != l2->safelen)
535 10 : return return_false_with_msg ("safelen");
536 395375 : if (l1->can_be_parallel != l2->can_be_parallel)
537 0 : return return_false_with_msg ("can_be_parallel");
538 395375 : if (l1->dont_vectorize != l2->dont_vectorize)
539 149 : return return_false_with_msg ("dont_vectorize");
540 395226 : if (l1->force_vectorize != l2->force_vectorize)
541 0 : return return_false_with_msg ("force_vectorize");
542 395226 : if (l1->finite_p != l2->finite_p)
543 3 : return return_false_with_msg ("finite_p");
544 395223 : if (l1->unroll != l2->unroll)
545 0 : return return_false_with_msg ("unroll");
546 395223 : if (!compare_variable_decl (l1->simduid, l2->simduid))
547 0 : return return_false_with_msg ("simduid");
548 395223 : if ((l1->any_upper_bound != l2->any_upper_bound)
549 395223 : || (l1->any_upper_bound
550 8413 : && (l1->nb_iterations_upper_bound != l2->nb_iterations_upper_bound)))
551 13 : return return_false_with_msg ("nb_iterations_upper_bound");
552 :
553 : return true;
554 : }
555 :
556 : /* Function visits all gimple labels and creates corresponding
557 : mapping between basic blocks and labels. */
558 :
559 : void
560 1160116 : func_checker::parse_labels (sem_bb *bb)
561 : {
562 6878846 : for (gimple_stmt_iterator gsi = gsi_start_bb (bb->bb); !gsi_end_p (gsi);
563 4558614 : gsi_next (&gsi))
564 : {
565 4558614 : gimple *stmt = gsi_stmt (gsi);
566 :
567 4579408 : if (glabel *label_stmt = dyn_cast <glabel *> (stmt))
568 : {
569 20794 : const_tree t = gimple_label_label (label_stmt);
570 20794 : gcc_assert (TREE_CODE (t) == LABEL_DECL);
571 :
572 20794 : m_label_bb_map.put (t, bb->bb->index);
573 : }
574 : }
575 1160116 : }
576 :
577 : /* Basic block equivalence comparison function that returns true if
578 : basic blocks BB1 and BB2 (from functions FUNC1 and FUNC2) correspond.
579 :
580 : In general, a collection of equivalence dictionaries is built for types
581 : like SSA names, declarations (VAR_DECL, PARM_DECL, ..). This infrastructure
582 : is utilized by every statement-by-statement comparison function. */
583 :
584 : bool
585 434186 : func_checker::compare_bb (sem_bb *bb1, sem_bb *bb2)
586 : {
587 434186 : gimple_stmt_iterator gsi1, gsi2;
588 434186 : gimple *s1, *s2;
589 :
590 434186 : gsi1 = gsi_start_nondebug_bb (bb1->bb);
591 434186 : gsi2 = gsi_start_nondebug_bb (bb2->bb);
592 :
593 1344150 : while (!gsi_end_p (gsi1))
594 : {
595 948760 : if (gsi_end_p (gsi2))
596 0 : return return_false ();
597 :
598 948760 : s1 = gsi_stmt (gsi1);
599 948760 : s2 = gsi_stmt (gsi2);
600 :
601 948760 : int eh1 = lookup_stmt_eh_lp_fn
602 948760 : (DECL_STRUCT_FUNCTION (m_source_func_decl), s1);
603 948760 : int eh2 = lookup_stmt_eh_lp_fn
604 948760 : (DECL_STRUCT_FUNCTION (m_target_func_decl), s2);
605 :
606 948760 : if (eh1 != eh2)
607 3 : return return_false_with_msg ("EH regions are different");
608 :
609 948757 : if (gimple_code (s1) != gimple_code (s2))
610 0 : return return_false_with_msg ("gimple codes are different");
611 :
612 948757 : switch (gimple_code (s1))
613 : {
614 247416 : case GIMPLE_CALL:
615 247416 : if (!compare_gimple_call (as_a <gcall *> (s1),
616 : as_a <gcall *> (s2)))
617 32653 : return return_different_stmts (s1, s2, "GIMPLE_CALL");
618 : break;
619 417221 : case GIMPLE_ASSIGN:
620 417221 : if (!compare_gimple_assign (s1, s2))
621 3646 : return return_different_stmts (s1, s2, "GIMPLE_ASSIGN");
622 : break;
623 116897 : case GIMPLE_COND:
624 116897 : if (!compare_gimple_cond (s1, s2))
625 2387 : return return_different_stmts (s1, s2, "GIMPLE_COND");
626 : break;
627 403 : case GIMPLE_SWITCH:
628 403 : if (!compare_gimple_switch (as_a <gswitch *> (s1),
629 403 : as_a <gswitch *> (s2)))
630 2 : return return_different_stmts (s1, s2, "GIMPLE_SWITCH");
631 : break;
632 : case GIMPLE_DEBUG:
633 : break;
634 393 : case GIMPLE_EH_DISPATCH:
635 393 : if (gimple_eh_dispatch_region (as_a <geh_dispatch *> (s1))
636 393 : != gimple_eh_dispatch_region (as_a <geh_dispatch *> (s2)))
637 0 : return return_different_stmts (s1, s2, "GIMPLE_EH_DISPATCH");
638 : break;
639 4205 : case GIMPLE_RESX:
640 4205 : if (!compare_gimple_resx (as_a <gresx *> (s1),
641 4205 : as_a <gresx *> (s2)))
642 0 : return return_different_stmts (s1, s2, "GIMPLE_RESX");
643 : break;
644 9088 : case GIMPLE_LABEL:
645 9088 : if (!compare_gimple_label (as_a <glabel *> (s1),
646 9088 : as_a <glabel *> (s2)))
647 10 : return return_different_stmts (s1, s2, "GIMPLE_LABEL");
648 : break;
649 147125 : case GIMPLE_RETURN:
650 147125 : if (!compare_gimple_return (as_a <greturn *> (s1),
651 147125 : as_a <greturn *> (s2)))
652 36 : return return_different_stmts (s1, s2, "GIMPLE_RETURN");
653 : break;
654 0 : case GIMPLE_GOTO:
655 0 : if (!compare_gimple_goto (s1, s2))
656 0 : return return_different_stmts (s1, s2, "GIMPLE_GOTO");
657 : break;
658 5409 : case GIMPLE_ASM:
659 5409 : if (!compare_gimple_asm (as_a <gasm *> (s1),
660 5409 : as_a <gasm *> (s2)))
661 59 : return return_different_stmts (s1, s2, "GIMPLE_ASM");
662 : break;
663 : case GIMPLE_PREDICT:
664 : case GIMPLE_NOP:
665 : break;
666 0 : default:
667 0 : return return_false_with_msg ("Unknown GIMPLE code reached");
668 : }
669 :
670 909964 : gsi_next_nondebug (&gsi1);
671 909964 : gsi_next_nondebug (&gsi2);
672 : }
673 :
674 395390 : if (!gsi_end_p (gsi2))
675 0 : return return_false ();
676 :
677 395390 : if (!compare_loops (bb1->bb, bb2->bb))
678 180 : return return_false ();
679 :
680 : return true;
681 : }
682 :
683 : /* Verifies for given GIMPLEs S1 and S2 that
684 : call statements are semantically equivalent. */
685 :
686 : bool
687 247416 : func_checker::compare_gimple_call (gcall *s1, gcall *s2)
688 : {
689 247416 : unsigned i;
690 247416 : tree t1, t2;
691 :
692 247416 : if (gimple_call_num_args (s1) != gimple_call_num_args (s2))
693 : return false;
694 :
695 247416 : operand_access_type_map map (5);
696 247416 : classify_operands (s1, &map);
697 :
698 247416 : t1 = gimple_call_fn (s1);
699 247416 : t2 = gimple_call_fn (s2);
700 247416 : if (!compare_operand (t1, t2, get_operand_access_type (&map, t1)))
701 0 : return return_false ();
702 :
703 : /* Compare flags. */
704 247416 : if (gimple_call_internal_p (s1) != gimple_call_internal_p (s2)
705 247416 : || gimple_call_ctrl_altering_p (s1) != gimple_call_ctrl_altering_p (s2)
706 247416 : || gimple_call_tail_p (s1) != gimple_call_tail_p (s2)
707 247416 : || gimple_call_return_slot_opt_p (s1) != gimple_call_return_slot_opt_p (s2)
708 247416 : || gimple_call_from_thunk_p (s1) != gimple_call_from_thunk_p (s2)
709 247416 : || gimple_call_from_new_or_delete (s1) != gimple_call_from_new_or_delete (s2)
710 247416 : || gimple_call_va_arg_pack_p (s1) != gimple_call_va_arg_pack_p (s2)
711 247416 : || gimple_call_alloca_for_var_p (s1) != gimple_call_alloca_for_var_p (s2)
712 494832 : || gimple_call_must_tail_p (s1) != gimple_call_must_tail_p (s2))
713 : return false;
714 :
715 247408 : unsigned check_arg_types_from = 0;
716 247408 : if (gimple_call_internal_p (s1))
717 : {
718 86378 : if (gimple_call_internal_fn (s1) != gimple_call_internal_fn (s2))
719 : return false;
720 : }
721 : else
722 : {
723 161030 : tree fntype1 = gimple_call_fntype (s1);
724 161030 : tree fntype2 = gimple_call_fntype (s2);
725 161030 : if (!types_compatible_p (fntype1, fntype2))
726 1153 : return return_false_with_msg ("call function types are not compatible");
727 :
728 159877 : if (comp_type_attributes (fntype1, fntype2) != 1)
729 0 : return return_false_with_msg ("different fntype attributes");
730 :
731 159877 : check_arg_types_from = gimple_call_num_args (s1);
732 159877 : if (!prototype_p (fntype1) || !prototype_p (fntype2))
733 : check_arg_types_from = 0;
734 159522 : else if (stdarg_p (fntype1))
735 : {
736 3134 : check_arg_types_from = list_length (TYPE_ARG_TYPES (fntype1));
737 3134 : if (stdarg_p (fntype2))
738 : {
739 3134 : unsigned n = list_length (TYPE_ARG_TYPES (fntype2));
740 3134 : check_arg_types_from = MIN (check_arg_types_from, n);
741 : }
742 : }
743 156388 : else if (stdarg_p (fntype2))
744 0 : check_arg_types_from = list_length (TYPE_ARG_TYPES (fntype2));
745 : }
746 :
747 218391 : tree chain1 = gimple_call_chain (s1);
748 218391 : tree chain2 = gimple_call_chain (s2);
749 218391 : if ((chain1 && !chain2)
750 218391 : || (!chain1 && chain2)
751 218391 : || !compare_operand (chain1, chain2,
752 : get_operand_access_type (&map, chain1)))
753 0 : return return_false_with_msg ("static call chains are different");
754 :
755 : /* Checking of argument. */
756 496990 : for (i = 0; i < gimple_call_num_args (s1); ++i)
757 : {
758 279596 : t1 = gimple_call_arg (s1, i);
759 279596 : t2 = gimple_call_arg (s2, i);
760 :
761 279596 : if (!compare_operand (t1, t2, get_operand_access_type (&map, t1)))
762 160 : return return_false_with_msg ("GIMPLE call operands are different");
763 279436 : if (i >= check_arg_types_from
764 279436 : && !types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2)))
765 837 : return return_false_with_msg ("GIMPLE call operand types are "
766 : "different");
767 : }
768 :
769 : /* Return value checking. */
770 217394 : t1 = gimple_get_lhs (s1);
771 217394 : t2 = gimple_get_lhs (s2);
772 :
773 : /* For internal calls, lhs types need to be verified, as neither fntype nor
774 : callee comparisons can catch that. */
775 217394 : if (gimple_call_internal_p (s1)
776 57894 : && t1
777 57894 : && t2
778 274953 : && !compatible_types_p (TREE_TYPE (t1), TREE_TYPE (t2)))
779 2610 : return return_false_with_msg ("GIMPLE internal call LHS type mismatch");
780 :
781 214784 : if (!gimple_call_internal_p (s1))
782 : {
783 159500 : cgraph_edge *e1 = cgraph_node::get (m_source_func_decl)->get_edge (s1);
784 159500 : cgraph_edge *e2 = cgraph_node::get (m_target_func_decl)->get_edge (s2);
785 159500 : class ipa_edge_args *args1 = ipa_edge_args_sum->get (e1);
786 159500 : class ipa_edge_args *args2 = ipa_edge_args_sum->get (e2);
787 159500 : if ((args1 != nullptr) != (args2 != nullptr))
788 0 : return return_false_with_msg ("ipa_edge_args mismatch");
789 159500 : if (args1)
790 : {
791 106619 : int n1 = ipa_get_cs_argument_count (args1);
792 106619 : int n2 = ipa_get_cs_argument_count (args2);
793 106619 : if (n1 != n2)
794 0 : return return_false_with_msg ("ipa_edge_args nargs mismatch");
795 226607 : for (int i = 0; i < n1; i++)
796 : {
797 120003 : struct ipa_jump_func *jf1 = ipa_get_ith_jump_func (args1, i);
798 120003 : struct ipa_jump_func *jf2 = ipa_get_ith_jump_func (args2, i);
799 120003 : if (((jf1 != nullptr) != (jf2 != nullptr))
800 120003 : || (jf1 && !ipa_jump_functions_equivalent_p (jf1, jf2)))
801 15 : return return_false_with_msg ("jump function mismatch");
802 : }
803 : }
804 : }
805 :
806 214769 : return compare_operand (t1, t2, get_operand_access_type (&map, t1));
807 247416 : }
808 :
809 :
810 : /* Verifies for given GIMPLEs S1 and S2 that
811 : assignment statements are semantically equivalent. */
812 :
813 : bool
814 417221 : func_checker::compare_gimple_assign (gimple *s1, gimple *s2)
815 : {
816 417221 : tree arg1, arg2;
817 417221 : tree_code code1, code2;
818 417221 : unsigned i;
819 :
820 417221 : code1 = gimple_assign_rhs_code (s1);
821 417221 : code2 = gimple_assign_rhs_code (s2);
822 :
823 417221 : if (code1 != code2)
824 : return false;
825 :
826 417221 : operand_access_type_map map (5);
827 417221 : classify_operands (s1, &map);
828 :
829 1751915 : for (i = 0; i < gimple_num_ops (s1); i++)
830 : {
831 921119 : arg1 = gimple_op (s1, i);
832 921119 : arg2 = gimple_op (s2, i);
833 :
834 : /* Compare types for LHS. */
835 921119 : if (i == 0 && !gimple_store_p (s1))
836 : {
837 335790 : if (!compatible_types_p (TREE_TYPE (arg1), TREE_TYPE (arg2)))
838 1358 : return return_false_with_msg ("GIMPLE LHS type mismatch");
839 : }
840 :
841 919761 : if (!compare_operand (arg1, arg2, get_operand_access_type (&map, arg1)))
842 2288 : return return_false_with_msg ("GIMPLE assignment operands "
843 : "are different");
844 : }
845 :
846 :
847 : return true;
848 417221 : }
849 :
850 : /* Verifies for given GIMPLEs S1 and S2 that
851 : condition statements are semantically equivalent. */
852 :
853 : bool
854 116897 : func_checker::compare_gimple_cond (gimple *s1, gimple *s2)
855 : {
856 116897 : tree t1, t2;
857 116897 : tree_code code1, code2;
858 :
859 116897 : code1 = gimple_cond_code (s1);
860 116897 : code2 = gimple_cond_code (s2);
861 :
862 116897 : if (code1 != code2)
863 : return false;
864 :
865 114511 : t1 = gimple_cond_lhs (s1);
866 114511 : t2 = gimple_cond_lhs (s2);
867 :
868 114511 : if (!compare_operand (t1, t2, OP_NORMAL))
869 : return false;
870 :
871 114510 : t1 = gimple_cond_rhs (s1);
872 114510 : t2 = gimple_cond_rhs (s2);
873 :
874 114510 : return compare_operand (t1, t2, OP_NORMAL);
875 : }
876 :
877 : /* Verifies for given GIMPLE_LABEL stmts S1 and S2 that
878 : label statements are semantically equivalent. */
879 :
880 : bool
881 9088 : func_checker::compare_gimple_label (const glabel *g1, const glabel *g2)
882 : {
883 9088 : if (m_ignore_labels)
884 : return true;
885 :
886 9088 : tree t1 = gimple_label_label (g1);
887 9088 : tree t2 = gimple_label_label (g2);
888 :
889 18166 : if (FORCED_LABEL (t1) || FORCED_LABEL (t2))
890 10 : return return_false_with_msg ("FORCED_LABEL");
891 :
892 : /* As the pass build BB to label mapping, no further check is needed. */
893 : return true;
894 : }
895 :
896 : /* Verifies for given GIMPLE_SWITCH stmts S1 and S2 that
897 : switch statements are semantically equivalent. */
898 :
899 : bool
900 403 : func_checker::compare_gimple_switch (const gswitch *g1, const gswitch *g2)
901 : {
902 403 : unsigned lsize1, lsize2, i;
903 :
904 403 : lsize1 = gimple_switch_num_labels (g1);
905 403 : lsize2 = gimple_switch_num_labels (g2);
906 :
907 403 : if (lsize1 != lsize2)
908 : return false;
909 :
910 402 : tree t1 = gimple_switch_index (g1);
911 402 : tree t2 = gimple_switch_index (g2);
912 :
913 402 : if (!compare_operand (t1, t2, OP_NORMAL))
914 : return false;
915 :
916 4031 : for (i = 0; i < lsize1; i++)
917 : {
918 3630 : tree label1 = gimple_switch_label (g1, i);
919 3630 : tree label2 = gimple_switch_label (g2, i);
920 :
921 : /* Label LOW and HIGH comparison. */
922 3630 : tree low1 = CASE_LOW (label1);
923 3630 : tree low2 = CASE_LOW (label2);
924 :
925 3630 : if (!tree_int_cst_equal (low1, low2))
926 1 : return return_false_with_msg ("case low values are different");
927 :
928 3629 : tree high1 = CASE_HIGH (label1);
929 3629 : tree high2 = CASE_HIGH (label2);
930 :
931 3629 : if (!tree_int_cst_equal (high1, high2))
932 0 : return return_false_with_msg ("case high values are different");
933 :
934 3629 : if (TREE_CODE (label1) == CASE_LABEL_EXPR
935 3629 : && TREE_CODE (label2) == CASE_LABEL_EXPR)
936 : {
937 3629 : label1 = CASE_LABEL (label1);
938 3629 : label2 = CASE_LABEL (label2);
939 :
940 3629 : if (!compare_operand (label1, label2, OP_NORMAL))
941 0 : return return_false_with_msg ("switch label_exprs are different");
942 : }
943 0 : else if (!tree_int_cst_equal (label1, label2))
944 0 : return return_false_with_msg ("switch labels are different");
945 : }
946 :
947 : return true;
948 : }
949 :
950 : /* Verifies for given GIMPLE_RETURN stmts S1 and S2 that
951 : return statements are semantically equivalent. */
952 :
953 : bool
954 147125 : func_checker::compare_gimple_return (const greturn *g1, const greturn *g2)
955 : {
956 147125 : tree t1, t2;
957 :
958 147125 : t1 = gimple_return_retval (g1);
959 147125 : t2 = gimple_return_retval (g2);
960 :
961 : /* Void return type. */
962 147125 : if (t1 == NULL && t2 == NULL)
963 : return true;
964 : else
965 : {
966 82791 : operand_access_type_map map (3);
967 82791 : return compare_operand (t1, t2, get_operand_access_type (&map, t1));
968 82791 : }
969 : }
970 :
971 : /* Verifies for given GIMPLEs S1 and S2 that
972 : goto statements are semantically equivalent. */
973 :
974 : bool
975 0 : func_checker::compare_gimple_goto (gimple *g1, gimple *g2)
976 : {
977 0 : tree dest1, dest2;
978 :
979 0 : dest1 = gimple_goto_dest (g1);
980 0 : dest2 = gimple_goto_dest (g2);
981 :
982 0 : if (TREE_CODE (dest1) != TREE_CODE (dest2) || TREE_CODE (dest1) != SSA_NAME)
983 : return false;
984 :
985 0 : return compare_operand (dest1, dest2, OP_NORMAL);
986 : }
987 :
988 : /* Verifies for given GIMPLE_RESX stmts S1 and S2 that
989 : resx statements are semantically equivalent. */
990 :
991 : bool
992 4205 : func_checker::compare_gimple_resx (const gresx *g1, const gresx *g2)
993 : {
994 4205 : return gimple_resx_region (g1) == gimple_resx_region (g2);
995 : }
996 :
997 : /* Verifies for given GIMPLEs S1 and S2 that ASM statements are equivalent.
998 : For the beginning, the pass only supports equality for
999 : '__asm__ __volatile__ ("", "", "", "memory")'. */
1000 :
1001 : bool
1002 5409 : func_checker::compare_gimple_asm (const gasm *g1, const gasm *g2)
1003 : {
1004 5409 : if (gimple_asm_volatile_p (g1) != gimple_asm_volatile_p (g2))
1005 : return false;
1006 :
1007 5409 : if (gimple_asm_basic_p (g1) != gimple_asm_basic_p (g2))
1008 : return false;
1009 :
1010 5409 : if (gimple_asm_inline_p (g1) != gimple_asm_inline_p (g2))
1011 : return false;
1012 :
1013 5409 : if (gimple_asm_ninputs (g1) != gimple_asm_ninputs (g2))
1014 : return false;
1015 :
1016 5408 : if (gimple_asm_noutputs (g1) != gimple_asm_noutputs (g2))
1017 : return false;
1018 :
1019 : /* We do not suppport goto ASM statement comparison. */
1020 5408 : if (gimple_asm_nlabels (g1) || gimple_asm_nlabels (g2))
1021 : return false;
1022 :
1023 5384 : if (gimple_asm_nclobbers (g1) != gimple_asm_nclobbers (g2))
1024 : return false;
1025 :
1026 5384 : if (strcmp (gimple_asm_string (g1), gimple_asm_string (g2)) != 0)
1027 5 : return return_false_with_msg ("ASM strings are different");
1028 :
1029 5379 : operand_access_type_map map (5);
1030 5379 : classify_operands (g1, &map);
1031 :
1032 5765 : for (unsigned i = 0; i < gimple_asm_ninputs (g1); i++)
1033 : {
1034 413 : tree input1 = gimple_asm_input_op (g1, i);
1035 413 : tree input2 = gimple_asm_input_op (g2, i);
1036 :
1037 413 : if (!compare_asm_inputs_outputs (input1, input2, &map))
1038 27 : return return_false_with_msg ("ASM input is different");
1039 : }
1040 :
1041 5856 : for (unsigned i = 0; i < gimple_asm_noutputs (g1); i++)
1042 : {
1043 506 : tree output1 = gimple_asm_output_op (g1, i);
1044 506 : tree output2 = gimple_asm_output_op (g2, i);
1045 :
1046 506 : if (!compare_asm_inputs_outputs (output1, output2, &map))
1047 2 : return return_false_with_msg ("ASM output is different");
1048 : }
1049 :
1050 18224 : for (unsigned i = 0; i < gimple_asm_nclobbers (g1); i++)
1051 : {
1052 12874 : tree clobber1 = gimple_asm_clobber_op (g1, i);
1053 12874 : tree clobber2 = gimple_asm_clobber_op (g2, i);
1054 :
1055 12874 : if (!operand_equal_p (TREE_VALUE (clobber1), TREE_VALUE (clobber2),
1056 : OEP_ONLY_CONST))
1057 0 : return return_false_with_msg ("ASM clobber is different");
1058 : }
1059 :
1060 : return true;
1061 5379 : }
1062 :
1063 : /* Helper for func_checker::classify_operands. Record that T is a load. */
1064 :
1065 : static bool
1066 8191729 : visit_load_store (gimple *, tree, tree t, void *data)
1067 : {
1068 8191729 : func_checker::operand_access_type_map *map =
1069 : (func_checker::operand_access_type_map *) data;
1070 8191729 : map->add (t);
1071 8191729 : return false;
1072 : }
1073 :
1074 : /* Compute hash map determining access types of operands. */
1075 :
1076 : void
1077 21080647 : func_checker::classify_operands (const gimple *stmt,
1078 : operand_access_type_map *map)
1079 : {
1080 21080647 : walk_stmt_load_store_ops (const_cast <gimple *> (stmt),
1081 : (void *)map, visit_load_store, visit_load_store);
1082 21080647 : }
1083 :
1084 : /* Return access type of a given operand. */
1085 :
1086 : func_checker::operand_access_type
1087 63118520 : func_checker::get_operand_access_type (operand_access_type_map *map, tree t)
1088 : {
1089 63118520 : if (map->contains (t))
1090 8181739 : return OP_MEMORY;
1091 : return OP_NORMAL;
1092 : }
1093 :
1094 : } // ipa_icf_gimple namespace
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