Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-math-opts.c @ 80:d8bf5c8fdea8
fix comments
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Sat, 24 Sep 2011 02:41:02 +0900 |
parents | f6334be47118 |
children | 04ced10e8804 |
rev | line source |
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0 | 1 /* Global, SSA-based optimizations using mathematical identities. |
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2 Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 |
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3 Free Software Foundation, Inc. |
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4 |
0 | 5 This file is part of GCC. |
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6 |
0 | 7 GCC is free software; you can redistribute it and/or modify it |
8 under the terms of the GNU General Public License as published by the | |
9 Free Software Foundation; either version 3, or (at your option) any | |
10 later version. | |
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11 |
0 | 12 GCC is distributed in the hope that it will be useful, but WITHOUT |
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
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16 |
0 | 17 You should have received a copy of the GNU General Public License |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 /* Currently, the only mini-pass in this file tries to CSE reciprocal | |
22 operations. These are common in sequences such as this one: | |
23 | |
24 modulus = sqrt(x*x + y*y + z*z); | |
25 x = x / modulus; | |
26 y = y / modulus; | |
27 z = z / modulus; | |
28 | |
29 that can be optimized to | |
30 | |
31 modulus = sqrt(x*x + y*y + z*z); | |
32 rmodulus = 1.0 / modulus; | |
33 x = x * rmodulus; | |
34 y = y * rmodulus; | |
35 z = z * rmodulus; | |
36 | |
37 We do this for loop invariant divisors, and with this pass whenever | |
38 we notice that a division has the same divisor multiple times. | |
39 | |
40 Of course, like in PRE, we don't insert a division if a dominator | |
41 already has one. However, this cannot be done as an extension of | |
42 PRE for several reasons. | |
43 | |
44 First of all, with some experiments it was found out that the | |
45 transformation is not always useful if there are only two divisions | |
46 hy the same divisor. This is probably because modern processors | |
47 can pipeline the divisions; on older, in-order processors it should | |
48 still be effective to optimize two divisions by the same number. | |
49 We make this a param, and it shall be called N in the remainder of | |
50 this comment. | |
51 | |
52 Second, if trapping math is active, we have less freedom on where | |
53 to insert divisions: we can only do so in basic blocks that already | |
54 contain one. (If divisions don't trap, instead, we can insert | |
55 divisions elsewhere, which will be in blocks that are common dominators | |
56 of those that have the division). | |
57 | |
58 We really don't want to compute the reciprocal unless a division will | |
59 be found. To do this, we won't insert the division in a basic block | |
60 that has less than N divisions *post-dominating* it. | |
61 | |
62 The algorithm constructs a subset of the dominator tree, holding the | |
63 blocks containing the divisions and the common dominators to them, | |
64 and walk it twice. The first walk is in post-order, and it annotates | |
65 each block with the number of divisions that post-dominate it: this | |
66 gives information on where divisions can be inserted profitably. | |
67 The second walk is in pre-order, and it inserts divisions as explained | |
68 above, and replaces divisions by multiplications. | |
69 | |
70 In the best case, the cost of the pass is O(n_statements). In the | |
71 worst-case, the cost is due to creating the dominator tree subset, | |
72 with a cost of O(n_basic_blocks ^ 2); however this can only happen | |
73 for n_statements / n_basic_blocks statements. So, the amortized cost | |
74 of creating the dominator tree subset is O(n_basic_blocks) and the | |
75 worst-case cost of the pass is O(n_statements * n_basic_blocks). | |
76 | |
77 More practically, the cost will be small because there are few | |
78 divisions, and they tend to be in the same basic block, so insert_bb | |
79 is called very few times. | |
80 | |
81 If we did this using domwalk.c, an efficient implementation would have | |
82 to work on all the variables in a single pass, because we could not | |
83 work on just a subset of the dominator tree, as we do now, and the | |
84 cost would also be something like O(n_statements * n_basic_blocks). | |
85 The data structures would be more complex in order to work on all the | |
86 variables in a single pass. */ | |
87 | |
88 #include "config.h" | |
89 #include "system.h" | |
90 #include "coretypes.h" | |
91 #include "tm.h" | |
92 #include "flags.h" | |
93 #include "tree.h" | |
94 #include "tree-flow.h" | |
95 #include "timevar.h" | |
96 #include "tree-pass.h" | |
97 #include "alloc-pool.h" | |
98 #include "basic-block.h" | |
99 #include "target.h" | |
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100 #include "gimple-pretty-print.h" |
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101 |
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102 /* FIXME: RTL headers have to be included here for optabs. */ |
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103 #include "rtl.h" /* Because optabs.h wants enum rtx_code. */ |
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104 #include "expr.h" /* Because optabs.h wants sepops. */ |
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105 #include "optabs.h" |
0 | 106 |
107 /* This structure represents one basic block that either computes a | |
108 division, or is a common dominator for basic block that compute a | |
109 division. */ | |
110 struct occurrence { | |
111 /* The basic block represented by this structure. */ | |
112 basic_block bb; | |
113 | |
114 /* If non-NULL, the SSA_NAME holding the definition for a reciprocal | |
115 inserted in BB. */ | |
116 tree recip_def; | |
117 | |
118 /* If non-NULL, the GIMPLE_ASSIGN for a reciprocal computation that | |
119 was inserted in BB. */ | |
120 gimple recip_def_stmt; | |
121 | |
122 /* Pointer to a list of "struct occurrence"s for blocks dominated | |
123 by BB. */ | |
124 struct occurrence *children; | |
125 | |
126 /* Pointer to the next "struct occurrence"s in the list of blocks | |
127 sharing a common dominator. */ | |
128 struct occurrence *next; | |
129 | |
130 /* The number of divisions that are in BB before compute_merit. The | |
131 number of divisions that are in BB or post-dominate it after | |
132 compute_merit. */ | |
133 int num_divisions; | |
134 | |
135 /* True if the basic block has a division, false if it is a common | |
136 dominator for basic blocks that do. If it is false and trapping | |
137 math is active, BB is not a candidate for inserting a reciprocal. */ | |
138 bool bb_has_division; | |
139 }; | |
140 | |
141 | |
142 /* The instance of "struct occurrence" representing the highest | |
143 interesting block in the dominator tree. */ | |
144 static struct occurrence *occ_head; | |
145 | |
146 /* Allocation pool for getting instances of "struct occurrence". */ | |
147 static alloc_pool occ_pool; | |
148 | |
149 | |
150 | |
151 /* Allocate and return a new struct occurrence for basic block BB, and | |
152 whose children list is headed by CHILDREN. */ | |
153 static struct occurrence * | |
154 occ_new (basic_block bb, struct occurrence *children) | |
155 { | |
156 struct occurrence *occ; | |
157 | |
158 bb->aux = occ = (struct occurrence *) pool_alloc (occ_pool); | |
159 memset (occ, 0, sizeof (struct occurrence)); | |
160 | |
161 occ->bb = bb; | |
162 occ->children = children; | |
163 return occ; | |
164 } | |
165 | |
166 | |
167 /* Insert NEW_OCC into our subset of the dominator tree. P_HEAD points to a | |
168 list of "struct occurrence"s, one per basic block, having IDOM as | |
169 their common dominator. | |
170 | |
171 We try to insert NEW_OCC as deep as possible in the tree, and we also | |
172 insert any other block that is a common dominator for BB and one | |
173 block already in the tree. */ | |
174 | |
175 static void | |
176 insert_bb (struct occurrence *new_occ, basic_block idom, | |
177 struct occurrence **p_head) | |
178 { | |
179 struct occurrence *occ, **p_occ; | |
180 | |
181 for (p_occ = p_head; (occ = *p_occ) != NULL; ) | |
182 { | |
183 basic_block bb = new_occ->bb, occ_bb = occ->bb; | |
184 basic_block dom = nearest_common_dominator (CDI_DOMINATORS, occ_bb, bb); | |
185 if (dom == bb) | |
186 { | |
187 /* BB dominates OCC_BB. OCC becomes NEW_OCC's child: remove OCC | |
188 from its list. */ | |
189 *p_occ = occ->next; | |
190 occ->next = new_occ->children; | |
191 new_occ->children = occ; | |
192 | |
193 /* Try the next block (it may as well be dominated by BB). */ | |
194 } | |
195 | |
196 else if (dom == occ_bb) | |
197 { | |
198 /* OCC_BB dominates BB. Tail recurse to look deeper. */ | |
199 insert_bb (new_occ, dom, &occ->children); | |
200 return; | |
201 } | |
202 | |
203 else if (dom != idom) | |
204 { | |
205 gcc_assert (!dom->aux); | |
206 | |
207 /* There is a dominator between IDOM and BB, add it and make | |
208 two children out of NEW_OCC and OCC. First, remove OCC from | |
209 its list. */ | |
210 *p_occ = occ->next; | |
211 new_occ->next = occ; | |
212 occ->next = NULL; | |
213 | |
214 /* None of the previous blocks has DOM as a dominator: if we tail | |
215 recursed, we would reexamine them uselessly. Just switch BB with | |
216 DOM, and go on looking for blocks dominated by DOM. */ | |
217 new_occ = occ_new (dom, new_occ); | |
218 } | |
219 | |
220 else | |
221 { | |
222 /* Nothing special, go on with the next element. */ | |
223 p_occ = &occ->next; | |
224 } | |
225 } | |
226 | |
227 /* No place was found as a child of IDOM. Make BB a sibling of IDOM. */ | |
228 new_occ->next = *p_head; | |
229 *p_head = new_occ; | |
230 } | |
231 | |
232 /* Register that we found a division in BB. */ | |
233 | |
234 static inline void | |
235 register_division_in (basic_block bb) | |
236 { | |
237 struct occurrence *occ; | |
238 | |
239 occ = (struct occurrence *) bb->aux; | |
240 if (!occ) | |
241 { | |
242 occ = occ_new (bb, NULL); | |
243 insert_bb (occ, ENTRY_BLOCK_PTR, &occ_head); | |
244 } | |
245 | |
246 occ->bb_has_division = true; | |
247 occ->num_divisions++; | |
248 } | |
249 | |
250 | |
251 /* Compute the number of divisions that postdominate each block in OCC and | |
252 its children. */ | |
253 | |
254 static void | |
255 compute_merit (struct occurrence *occ) | |
256 { | |
257 struct occurrence *occ_child; | |
258 basic_block dom = occ->bb; | |
259 | |
260 for (occ_child = occ->children; occ_child; occ_child = occ_child->next) | |
261 { | |
262 basic_block bb; | |
263 if (occ_child->children) | |
264 compute_merit (occ_child); | |
265 | |
266 if (flag_exceptions) | |
267 bb = single_noncomplex_succ (dom); | |
268 else | |
269 bb = dom; | |
270 | |
271 if (dominated_by_p (CDI_POST_DOMINATORS, bb, occ_child->bb)) | |
272 occ->num_divisions += occ_child->num_divisions; | |
273 } | |
274 } | |
275 | |
276 | |
277 /* Return whether USE_STMT is a floating-point division by DEF. */ | |
278 static inline bool | |
279 is_division_by (gimple use_stmt, tree def) | |
280 { | |
281 return is_gimple_assign (use_stmt) | |
282 && gimple_assign_rhs_code (use_stmt) == RDIV_EXPR | |
283 && gimple_assign_rhs2 (use_stmt) == def | |
284 /* Do not recognize x / x as valid division, as we are getting | |
285 confused later by replacing all immediate uses x in such | |
286 a stmt. */ | |
287 && gimple_assign_rhs1 (use_stmt) != def; | |
288 } | |
289 | |
290 /* Walk the subset of the dominator tree rooted at OCC, setting the | |
291 RECIP_DEF field to a definition of 1.0 / DEF that can be used in | |
292 the given basic block. The field may be left NULL, of course, | |
293 if it is not possible or profitable to do the optimization. | |
294 | |
295 DEF_BSI is an iterator pointing at the statement defining DEF. | |
296 If RECIP_DEF is set, a dominator already has a computation that can | |
297 be used. */ | |
298 | |
299 static void | |
300 insert_reciprocals (gimple_stmt_iterator *def_gsi, struct occurrence *occ, | |
301 tree def, tree recip_def, int threshold) | |
302 { | |
303 tree type; | |
304 gimple new_stmt; | |
305 gimple_stmt_iterator gsi; | |
306 struct occurrence *occ_child; | |
307 | |
308 if (!recip_def | |
309 && (occ->bb_has_division || !flag_trapping_math) | |
310 && occ->num_divisions >= threshold) | |
311 { | |
312 /* Make a variable with the replacement and substitute it. */ | |
313 type = TREE_TYPE (def); | |
314 recip_def = make_rename_temp (type, "reciptmp"); | |
315 new_stmt = gimple_build_assign_with_ops (RDIV_EXPR, recip_def, | |
316 build_one_cst (type), def); | |
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317 |
0 | 318 if (occ->bb_has_division) |
319 { | |
320 /* Case 1: insert before an existing division. */ | |
321 gsi = gsi_after_labels (occ->bb); | |
322 while (!gsi_end_p (gsi) && !is_division_by (gsi_stmt (gsi), def)) | |
323 gsi_next (&gsi); | |
324 | |
325 gsi_insert_before (&gsi, new_stmt, GSI_SAME_STMT); | |
326 } | |
327 else if (def_gsi && occ->bb == def_gsi->bb) | |
328 { | |
329 /* Case 2: insert right after the definition. Note that this will | |
330 never happen if the definition statement can throw, because in | |
331 that case the sole successor of the statement's basic block will | |
332 dominate all the uses as well. */ | |
333 gsi_insert_after (def_gsi, new_stmt, GSI_NEW_STMT); | |
334 } | |
335 else | |
336 { | |
337 /* Case 3: insert in a basic block not containing defs/uses. */ | |
338 gsi = gsi_after_labels (occ->bb); | |
339 gsi_insert_before (&gsi, new_stmt, GSI_SAME_STMT); | |
340 } | |
341 | |
342 occ->recip_def_stmt = new_stmt; | |
343 } | |
344 | |
345 occ->recip_def = recip_def; | |
346 for (occ_child = occ->children; occ_child; occ_child = occ_child->next) | |
347 insert_reciprocals (def_gsi, occ_child, def, recip_def, threshold); | |
348 } | |
349 | |
350 | |
351 /* Replace the division at USE_P with a multiplication by the reciprocal, if | |
352 possible. */ | |
353 | |
354 static inline void | |
355 replace_reciprocal (use_operand_p use_p) | |
356 { | |
357 gimple use_stmt = USE_STMT (use_p); | |
358 basic_block bb = gimple_bb (use_stmt); | |
359 struct occurrence *occ = (struct occurrence *) bb->aux; | |
360 | |
361 if (optimize_bb_for_speed_p (bb) | |
362 && occ->recip_def && use_stmt != occ->recip_def_stmt) | |
363 { | |
364 gimple_assign_set_rhs_code (use_stmt, MULT_EXPR); | |
365 SET_USE (use_p, occ->recip_def); | |
366 fold_stmt_inplace (use_stmt); | |
367 update_stmt (use_stmt); | |
368 } | |
369 } | |
370 | |
371 | |
372 /* Free OCC and return one more "struct occurrence" to be freed. */ | |
373 | |
374 static struct occurrence * | |
375 free_bb (struct occurrence *occ) | |
376 { | |
377 struct occurrence *child, *next; | |
378 | |
379 /* First get the two pointers hanging off OCC. */ | |
380 next = occ->next; | |
381 child = occ->children; | |
382 occ->bb->aux = NULL; | |
383 pool_free (occ_pool, occ); | |
384 | |
385 /* Now ensure that we don't recurse unless it is necessary. */ | |
386 if (!child) | |
387 return next; | |
388 else | |
389 { | |
390 while (next) | |
391 next = free_bb (next); | |
392 | |
393 return child; | |
394 } | |
395 } | |
396 | |
397 | |
398 /* Look for floating-point divisions among DEF's uses, and try to | |
399 replace them by multiplications with the reciprocal. Add | |
400 as many statements computing the reciprocal as needed. | |
401 | |
402 DEF must be a GIMPLE register of a floating-point type. */ | |
403 | |
404 static void | |
405 execute_cse_reciprocals_1 (gimple_stmt_iterator *def_gsi, tree def) | |
406 { | |
407 use_operand_p use_p; | |
408 imm_use_iterator use_iter; | |
409 struct occurrence *occ; | |
410 int count = 0, threshold; | |
411 | |
412 gcc_assert (FLOAT_TYPE_P (TREE_TYPE (def)) && is_gimple_reg (def)); | |
413 | |
414 FOR_EACH_IMM_USE_FAST (use_p, use_iter, def) | |
415 { | |
416 gimple use_stmt = USE_STMT (use_p); | |
417 if (is_division_by (use_stmt, def)) | |
418 { | |
419 register_division_in (gimple_bb (use_stmt)); | |
420 count++; | |
421 } | |
422 } | |
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423 |
0 | 424 /* Do the expensive part only if we can hope to optimize something. */ |
425 threshold = targetm.min_divisions_for_recip_mul (TYPE_MODE (TREE_TYPE (def))); | |
426 if (count >= threshold) | |
427 { | |
428 gimple use_stmt; | |
429 for (occ = occ_head; occ; occ = occ->next) | |
430 { | |
431 compute_merit (occ); | |
432 insert_reciprocals (def_gsi, occ, def, NULL, threshold); | |
433 } | |
434 | |
435 FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, def) | |
436 { | |
437 if (is_division_by (use_stmt, def)) | |
438 { | |
439 FOR_EACH_IMM_USE_ON_STMT (use_p, use_iter) | |
440 replace_reciprocal (use_p); | |
441 } | |
442 } | |
443 } | |
444 | |
445 for (occ = occ_head; occ; ) | |
446 occ = free_bb (occ); | |
447 | |
448 occ_head = NULL; | |
449 } | |
450 | |
451 static bool | |
452 gate_cse_reciprocals (void) | |
453 { | |
454 return optimize && flag_reciprocal_math; | |
455 } | |
456 | |
457 /* Go through all the floating-point SSA_NAMEs, and call | |
458 execute_cse_reciprocals_1 on each of them. */ | |
459 static unsigned int | |
460 execute_cse_reciprocals (void) | |
461 { | |
462 basic_block bb; | |
463 tree arg; | |
464 | |
465 occ_pool = create_alloc_pool ("dominators for recip", | |
466 sizeof (struct occurrence), | |
467 n_basic_blocks / 3 + 1); | |
468 | |
469 calculate_dominance_info (CDI_DOMINATORS); | |
470 calculate_dominance_info (CDI_POST_DOMINATORS); | |
471 | |
472 #ifdef ENABLE_CHECKING | |
473 FOR_EACH_BB (bb) | |
474 gcc_assert (!bb->aux); | |
475 #endif | |
476 | |
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477 for (arg = DECL_ARGUMENTS (cfun->decl); arg; arg = DECL_CHAIN (arg)) |
0 | 478 if (gimple_default_def (cfun, arg) |
479 && FLOAT_TYPE_P (TREE_TYPE (arg)) | |
480 && is_gimple_reg (arg)) | |
481 execute_cse_reciprocals_1 (NULL, gimple_default_def (cfun, arg)); | |
482 | |
483 FOR_EACH_BB (bb) | |
484 { | |
485 gimple_stmt_iterator gsi; | |
486 gimple phi; | |
487 tree def; | |
488 | |
489 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
490 { | |
491 phi = gsi_stmt (gsi); | |
492 def = PHI_RESULT (phi); | |
493 if (FLOAT_TYPE_P (TREE_TYPE (def)) | |
494 && is_gimple_reg (def)) | |
495 execute_cse_reciprocals_1 (NULL, def); | |
496 } | |
497 | |
498 for (gsi = gsi_after_labels (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
499 { | |
500 gimple stmt = gsi_stmt (gsi); | |
501 | |
502 if (gimple_has_lhs (stmt) | |
503 && (def = SINGLE_SSA_TREE_OPERAND (stmt, SSA_OP_DEF)) != NULL | |
504 && FLOAT_TYPE_P (TREE_TYPE (def)) | |
505 && TREE_CODE (def) == SSA_NAME) | |
506 execute_cse_reciprocals_1 (&gsi, def); | |
507 } | |
508 | |
509 if (optimize_bb_for_size_p (bb)) | |
510 continue; | |
511 | |
512 /* Scan for a/func(b) and convert it to reciprocal a*rfunc(b). */ | |
513 for (gsi = gsi_after_labels (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
514 { | |
515 gimple stmt = gsi_stmt (gsi); | |
516 tree fndecl; | |
517 | |
518 if (is_gimple_assign (stmt) | |
519 && gimple_assign_rhs_code (stmt) == RDIV_EXPR) | |
520 { | |
521 tree arg1 = gimple_assign_rhs2 (stmt); | |
522 gimple stmt1; | |
523 | |
524 if (TREE_CODE (arg1) != SSA_NAME) | |
525 continue; | |
526 | |
527 stmt1 = SSA_NAME_DEF_STMT (arg1); | |
528 | |
529 if (is_gimple_call (stmt1) | |
530 && gimple_call_lhs (stmt1) | |
531 && (fndecl = gimple_call_fndecl (stmt1)) | |
532 && (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL | |
533 || DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)) | |
534 { | |
535 enum built_in_function code; | |
47
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536 bool md_code, fail; |
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537 imm_use_iterator ui; |
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538 use_operand_p use_p; |
0 | 539 |
540 code = DECL_FUNCTION_CODE (fndecl); | |
541 md_code = DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD; | |
542 | |
543 fndecl = targetm.builtin_reciprocal (code, md_code, false); | |
544 if (!fndecl) | |
545 continue; | |
546 | |
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547 /* Check that all uses of the SSA name are divisions, |
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548 otherwise replacing the defining statement will do |
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549 the wrong thing. */ |
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550 fail = false; |
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551 FOR_EACH_IMM_USE_FAST (use_p, ui, arg1) |
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552 { |
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553 gimple stmt2 = USE_STMT (use_p); |
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554 if (is_gimple_debug (stmt2)) |
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555 continue; |
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556 if (!is_gimple_assign (stmt2) |
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557 || gimple_assign_rhs_code (stmt2) != RDIV_EXPR |
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558 || gimple_assign_rhs1 (stmt2) == arg1 |
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559 || gimple_assign_rhs2 (stmt2) != arg1) |
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560 { |
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561 fail = true; |
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562 break; |
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563 } |
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564 } |
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565 if (fail) |
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566 continue; |
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567 |
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568 gimple_replace_lhs (stmt1, arg1); |
0 | 569 gimple_call_set_fndecl (stmt1, fndecl); |
570 update_stmt (stmt1); | |
571 | |
47
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572 FOR_EACH_IMM_USE_STMT (stmt, ui, arg1) |
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573 { |
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574 gimple_assign_set_rhs_code (stmt, MULT_EXPR); |
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575 fold_stmt_inplace (stmt); |
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576 update_stmt (stmt); |
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577 } |
0 | 578 } |
579 } | |
580 } | |
581 } | |
582 | |
583 free_dominance_info (CDI_DOMINATORS); | |
584 free_dominance_info (CDI_POST_DOMINATORS); | |
585 free_alloc_pool (occ_pool); | |
586 return 0; | |
587 } | |
588 | |
589 struct gimple_opt_pass pass_cse_reciprocals = | |
590 { | |
591 { | |
592 GIMPLE_PASS, | |
593 "recip", /* name */ | |
594 gate_cse_reciprocals, /* gate */ | |
595 execute_cse_reciprocals, /* execute */ | |
596 NULL, /* sub */ | |
597 NULL, /* next */ | |
598 0, /* static_pass_number */ | |
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599 TV_NONE, /* tv_id */ |
0 | 600 PROP_ssa, /* properties_required */ |
601 0, /* properties_provided */ | |
602 0, /* properties_destroyed */ | |
603 0, /* todo_flags_start */ | |
604 TODO_dump_func | TODO_update_ssa | TODO_verify_ssa | |
605 | TODO_verify_stmts /* todo_flags_finish */ | |
606 } | |
607 }; | |
608 | |
609 /* Records an occurrence at statement USE_STMT in the vector of trees | |
610 STMTS if it is dominated by *TOP_BB or dominates it or this basic block | |
611 is not yet initialized. Returns true if the occurrence was pushed on | |
612 the vector. Adjusts *TOP_BB to be the basic block dominating all | |
613 statements in the vector. */ | |
614 | |
615 static bool | |
616 maybe_record_sincos (VEC(gimple, heap) **stmts, | |
617 basic_block *top_bb, gimple use_stmt) | |
618 { | |
619 basic_block use_bb = gimple_bb (use_stmt); | |
620 if (*top_bb | |
621 && (*top_bb == use_bb | |
622 || dominated_by_p (CDI_DOMINATORS, use_bb, *top_bb))) | |
623 VEC_safe_push (gimple, heap, *stmts, use_stmt); | |
624 else if (!*top_bb | |
625 || dominated_by_p (CDI_DOMINATORS, *top_bb, use_bb)) | |
626 { | |
627 VEC_safe_push (gimple, heap, *stmts, use_stmt); | |
628 *top_bb = use_bb; | |
629 } | |
630 else | |
631 return false; | |
632 | |
633 return true; | |
634 } | |
635 | |
636 /* Look for sin, cos and cexpi calls with the same argument NAME and | |
637 create a single call to cexpi CSEing the result in this case. | |
638 We first walk over all immediate uses of the argument collecting | |
639 statements that we can CSE in a vector and in a second pass replace | |
640 the statement rhs with a REALPART or IMAGPART expression on the | |
641 result of the cexpi call we insert before the use statement that | |
642 dominates all other candidates. */ | |
643 | |
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644 static bool |
0 | 645 execute_cse_sincos_1 (tree name) |
646 { | |
647 gimple_stmt_iterator gsi; | |
648 imm_use_iterator use_iter; | |
649 tree fndecl, res, type; | |
650 gimple def_stmt, use_stmt, stmt; | |
651 int seen_cos = 0, seen_sin = 0, seen_cexpi = 0; | |
652 VEC(gimple, heap) *stmts = NULL; | |
653 basic_block top_bb = NULL; | |
654 int i; | |
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655 bool cfg_changed = false; |
0 | 656 |
657 type = TREE_TYPE (name); | |
658 FOR_EACH_IMM_USE_STMT (use_stmt, use_iter, name) | |
659 { | |
660 if (gimple_code (use_stmt) != GIMPLE_CALL | |
661 || !gimple_call_lhs (use_stmt) | |
662 || !(fndecl = gimple_call_fndecl (use_stmt)) | |
663 || DECL_BUILT_IN_CLASS (fndecl) != BUILT_IN_NORMAL) | |
664 continue; | |
665 | |
666 switch (DECL_FUNCTION_CODE (fndecl)) | |
667 { | |
668 CASE_FLT_FN (BUILT_IN_COS): | |
669 seen_cos |= maybe_record_sincos (&stmts, &top_bb, use_stmt) ? 1 : 0; | |
670 break; | |
671 | |
672 CASE_FLT_FN (BUILT_IN_SIN): | |
673 seen_sin |= maybe_record_sincos (&stmts, &top_bb, use_stmt) ? 1 : 0; | |
674 break; | |
675 | |
676 CASE_FLT_FN (BUILT_IN_CEXPI): | |
677 seen_cexpi |= maybe_record_sincos (&stmts, &top_bb, use_stmt) ? 1 : 0; | |
678 break; | |
679 | |
680 default:; | |
681 } | |
682 } | |
683 | |
684 if (seen_cos + seen_sin + seen_cexpi <= 1) | |
685 { | |
686 VEC_free(gimple, heap, stmts); | |
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687 return false; |
0 | 688 } |
689 | |
690 /* Simply insert cexpi at the beginning of top_bb but not earlier than | |
691 the name def statement. */ | |
692 fndecl = mathfn_built_in (type, BUILT_IN_CEXPI); | |
693 if (!fndecl) | |
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694 return false; |
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695 res = create_tmp_reg (TREE_TYPE (TREE_TYPE (fndecl)), "sincostmp"); |
0 | 696 stmt = gimple_build_call (fndecl, 1, name); |
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697 res = make_ssa_name (res, stmt); |
0 | 698 gimple_call_set_lhs (stmt, res); |
699 | |
700 def_stmt = SSA_NAME_DEF_STMT (name); | |
701 if (!SSA_NAME_IS_DEFAULT_DEF (name) | |
702 && gimple_code (def_stmt) != GIMPLE_PHI | |
703 && gimple_bb (def_stmt) == top_bb) | |
704 { | |
705 gsi = gsi_for_stmt (def_stmt); | |
706 gsi_insert_after (&gsi, stmt, GSI_SAME_STMT); | |
707 } | |
708 else | |
709 { | |
710 gsi = gsi_after_labels (top_bb); | |
711 gsi_insert_before (&gsi, stmt, GSI_SAME_STMT); | |
712 } | |
713 update_stmt (stmt); | |
714 | |
715 /* And adjust the recorded old call sites. */ | |
716 for (i = 0; VEC_iterate(gimple, stmts, i, use_stmt); ++i) | |
717 { | |
718 tree rhs = NULL; | |
719 fndecl = gimple_call_fndecl (use_stmt); | |
720 | |
721 switch (DECL_FUNCTION_CODE (fndecl)) | |
722 { | |
723 CASE_FLT_FN (BUILT_IN_COS): | |
724 rhs = fold_build1 (REALPART_EXPR, type, res); | |
725 break; | |
726 | |
727 CASE_FLT_FN (BUILT_IN_SIN): | |
728 rhs = fold_build1 (IMAGPART_EXPR, type, res); | |
729 break; | |
730 | |
731 CASE_FLT_FN (BUILT_IN_CEXPI): | |
732 rhs = res; | |
733 break; | |
734 | |
735 default:; | |
736 gcc_unreachable (); | |
737 } | |
738 | |
739 /* Replace call with a copy. */ | |
740 stmt = gimple_build_assign (gimple_call_lhs (use_stmt), rhs); | |
741 | |
742 gsi = gsi_for_stmt (use_stmt); | |
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743 gsi_replace (&gsi, stmt, true); |
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744 if (gimple_purge_dead_eh_edges (gimple_bb (stmt))) |
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745 cfg_changed = true; |
0 | 746 } |
747 | |
748 VEC_free(gimple, heap, stmts); | |
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749 |
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750 return cfg_changed; |
0 | 751 } |
752 | |
753 /* Go through all calls to sin, cos and cexpi and call execute_cse_sincos_1 | |
754 on the SSA_NAME argument of each of them. */ | |
755 | |
756 static unsigned int | |
757 execute_cse_sincos (void) | |
758 { | |
759 basic_block bb; | |
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760 bool cfg_changed = false; |
0 | 761 |
762 calculate_dominance_info (CDI_DOMINATORS); | |
763 | |
764 FOR_EACH_BB (bb) | |
765 { | |
766 gimple_stmt_iterator gsi; | |
767 | |
768 for (gsi = gsi_after_labels (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
769 { | |
770 gimple stmt = gsi_stmt (gsi); | |
771 tree fndecl; | |
772 | |
773 if (is_gimple_call (stmt) | |
774 && gimple_call_lhs (stmt) | |
775 && (fndecl = gimple_call_fndecl (stmt)) | |
776 && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL) | |
777 { | |
778 tree arg; | |
779 | |
780 switch (DECL_FUNCTION_CODE (fndecl)) | |
781 { | |
782 CASE_FLT_FN (BUILT_IN_COS): | |
783 CASE_FLT_FN (BUILT_IN_SIN): | |
784 CASE_FLT_FN (BUILT_IN_CEXPI): | |
785 arg = gimple_call_arg (stmt, 0); | |
786 if (TREE_CODE (arg) == SSA_NAME) | |
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787 cfg_changed |= execute_cse_sincos_1 (arg); |
0 | 788 break; |
789 | |
790 default:; | |
791 } | |
792 } | |
793 } | |
794 } | |
795 | |
796 free_dominance_info (CDI_DOMINATORS); | |
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797 return cfg_changed ? TODO_cleanup_cfg : 0; |
0 | 798 } |
799 | |
800 static bool | |
801 gate_cse_sincos (void) | |
802 { | |
803 /* Make sure we have either sincos or cexp. */ | |
804 return (TARGET_HAS_SINCOS | |
805 || TARGET_C99_FUNCTIONS) | |
806 && optimize; | |
807 } | |
808 | |
809 struct gimple_opt_pass pass_cse_sincos = | |
810 { | |
811 { | |
812 GIMPLE_PASS, | |
813 "sincos", /* name */ | |
814 gate_cse_sincos, /* gate */ | |
815 execute_cse_sincos, /* execute */ | |
816 NULL, /* sub */ | |
817 NULL, /* next */ | |
818 0, /* static_pass_number */ | |
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819 TV_NONE, /* tv_id */ |
0 | 820 PROP_ssa, /* properties_required */ |
821 0, /* properties_provided */ | |
822 0, /* properties_destroyed */ | |
823 0, /* todo_flags_start */ | |
824 TODO_dump_func | TODO_update_ssa | TODO_verify_ssa | |
825 | TODO_verify_stmts /* todo_flags_finish */ | |
826 } | |
827 }; | |
828 | |
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829 /* A symbolic number is used to detect byte permutation and selection |
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830 patterns. Therefore the field N contains an artificial number |
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831 consisting of byte size markers: |
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832 |
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833 0 - byte has the value 0 |
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834 1..size - byte contains the content of the byte |
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835 number indexed with that value minus one */ |
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836 |
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837 struct symbolic_number { |
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838 unsigned HOST_WIDEST_INT n; |
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839 int size; |
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|
840 }; |
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|
841 |
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|
842 /* Perform a SHIFT or ROTATE operation by COUNT bits on symbolic |
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843 number N. Return false if the requested operation is not permitted |
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diff
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|
844 on a symbolic number. */ |
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diff
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|
845 |
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diff
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|
846 static inline bool |
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parents:
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diff
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|
847 do_shift_rotate (enum tree_code code, |
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diff
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|
848 struct symbolic_number *n, |
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diff
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|
849 int count) |
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parents:
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diff
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|
850 { |
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diff
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|
851 if (count % 8 != 0) |
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parents:
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diff
changeset
|
852 return false; |
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diff
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|
853 |
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parents:
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diff
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|
854 /* Zero out the extra bits of N in order to avoid them being shifted |
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parents:
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diff
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|
855 into the significant bits. */ |
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|
856 if (n->size < (int)sizeof (HOST_WIDEST_INT)) |
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|
857 n->n &= ((unsigned HOST_WIDEST_INT)1 << (n->size * BITS_PER_UNIT)) - 1; |
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diff
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|
858 |
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diff
changeset
|
859 switch (code) |
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|
860 { |
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diff
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861 case LSHIFT_EXPR: |
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862 n->n <<= count; |
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changeset
|
863 break; |
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|
864 case RSHIFT_EXPR: |
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865 n->n >>= count; |
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diff
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|
866 break; |
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diff
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|
867 case LROTATE_EXPR: |
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868 n->n = (n->n << count) | (n->n >> ((n->size * BITS_PER_UNIT) - count)); |
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changeset
|
869 break; |
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diff
changeset
|
870 case RROTATE_EXPR: |
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871 n->n = (n->n >> count) | (n->n << ((n->size * BITS_PER_UNIT) - count)); |
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diff
changeset
|
872 break; |
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|
873 default: |
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diff
changeset
|
874 return false; |
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|
875 } |
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|
876 return true; |
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877 } |
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diff
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|
878 |
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parents:
47
diff
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|
879 /* Perform sanity checking for the symbolic number N and the gimple |
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diff
changeset
|
880 statement STMT. */ |
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diff
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|
881 |
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diff
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|
882 static inline bool |
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|
883 verify_symbolic_number_p (struct symbolic_number *n, gimple stmt) |
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changeset
|
884 { |
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update it from 4.4.3 to 4.5.0
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parents:
47
diff
changeset
|
885 tree lhs_type; |
77e2b8dfacca
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parents:
47
diff
changeset
|
886 |
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parents:
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diff
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|
887 lhs_type = gimple_expr_type (stmt); |
77e2b8dfacca
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47
diff
changeset
|
888 |
77e2b8dfacca
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diff
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|
889 if (TREE_CODE (lhs_type) != INTEGER_TYPE) |
77e2b8dfacca
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parents:
47
diff
changeset
|
890 return false; |
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parents:
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diff
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|
891 |
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47
diff
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|
892 if (TYPE_PRECISION (lhs_type) != n->size * BITS_PER_UNIT) |
77e2b8dfacca
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47
diff
changeset
|
893 return false; |
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diff
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|
894 |
77e2b8dfacca
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diff
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|
895 return true; |
77e2b8dfacca
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diff
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|
896 } |
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diff
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|
897 |
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update it from 4.4.3 to 4.5.0
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diff
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|
898 /* find_bswap_1 invokes itself recursively with N and tries to perform |
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parents:
47
diff
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|
899 the operation given by the rhs of STMT on the result. If the |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
47
diff
changeset
|
900 operation could successfully be executed the function returns the |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
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|
901 tree expression of the source operand and NULL otherwise. */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
47
diff
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|
902 |
77e2b8dfacca
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47
diff
changeset
|
903 static tree |
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47
diff
changeset
|
904 find_bswap_1 (gimple stmt, struct symbolic_number *n, int limit) |
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47
diff
changeset
|
905 { |
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update it from 4.4.3 to 4.5.0
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parents:
47
diff
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|
906 enum tree_code code; |
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update it from 4.4.3 to 4.5.0
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47
diff
changeset
|
907 tree rhs1, rhs2 = NULL; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
47
diff
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|
908 gimple rhs1_stmt, rhs2_stmt; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
47
diff
changeset
|
909 tree source_expr1; |
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update it from 4.4.3 to 4.5.0
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parents:
47
diff
changeset
|
910 enum gimple_rhs_class rhs_class; |
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update it from 4.4.3 to 4.5.0
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diff
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|
911 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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47
diff
changeset
|
912 if (!limit || !is_gimple_assign (stmt)) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
47
diff
changeset
|
913 return NULL_TREE; |
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diff
changeset
|
914 |
77e2b8dfacca
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47
diff
changeset
|
915 rhs1 = gimple_assign_rhs1 (stmt); |
77e2b8dfacca
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47
diff
changeset
|
916 |
77e2b8dfacca
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parents:
47
diff
changeset
|
917 if (TREE_CODE (rhs1) != SSA_NAME) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
918 return NULL_TREE; |
77e2b8dfacca
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parents:
47
diff
changeset
|
919 |
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parents:
47
diff
changeset
|
920 code = gimple_assign_rhs_code (stmt); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
47
diff
changeset
|
921 rhs_class = gimple_assign_rhs_class (stmt); |
77e2b8dfacca
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parents:
47
diff
changeset
|
922 rhs1_stmt = SSA_NAME_DEF_STMT (rhs1); |
77e2b8dfacca
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parents:
47
diff
changeset
|
923 |
77e2b8dfacca
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parents:
47
diff
changeset
|
924 if (rhs_class == GIMPLE_BINARY_RHS) |
77e2b8dfacca
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parents:
47
diff
changeset
|
925 rhs2 = gimple_assign_rhs2 (stmt); |
77e2b8dfacca
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parents:
47
diff
changeset
|
926 |
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
927 /* Handle unary rhs and binary rhs with integer constants as second |
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
928 operand. */ |
77e2b8dfacca
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parents:
47
diff
changeset
|
929 |
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parents:
47
diff
changeset
|
930 if (rhs_class == GIMPLE_UNARY_RHS |
77e2b8dfacca
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parents:
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diff
changeset
|
931 || (rhs_class == GIMPLE_BINARY_RHS |
77e2b8dfacca
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parents:
47
diff
changeset
|
932 && TREE_CODE (rhs2) == INTEGER_CST)) |
77e2b8dfacca
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parents:
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diff
changeset
|
933 { |
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update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
934 if (code != BIT_AND_EXPR |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
935 && code != LSHIFT_EXPR |
77e2b8dfacca
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parents:
47
diff
changeset
|
936 && code != RSHIFT_EXPR |
77e2b8dfacca
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parents:
47
diff
changeset
|
937 && code != LROTATE_EXPR |
77e2b8dfacca
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parents:
47
diff
changeset
|
938 && code != RROTATE_EXPR |
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
939 && code != NOP_EXPR |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
47
diff
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|
940 && code != CONVERT_EXPR) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
941 return NULL_TREE; |
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
942 |
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
943 source_expr1 = find_bswap_1 (rhs1_stmt, n, limit - 1); |
77e2b8dfacca
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parents:
47
diff
changeset
|
944 |
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
945 /* If find_bswap_1 returned NULL STMT is a leaf node and we have |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
946 to initialize the symbolic number. */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
947 if (!source_expr1) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
948 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
949 /* Set up the symbolic number N by setting each byte to a |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
950 value between 1 and the byte size of rhs1. The highest |
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
951 order byte is set to n->size and the lowest order |
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
952 byte to 1. */ |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
953 n->size = TYPE_PRECISION (TREE_TYPE (rhs1)); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
954 if (n->size % BITS_PER_UNIT != 0) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
955 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
956 n->size /= BITS_PER_UNIT; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
957 n->n = (sizeof (HOST_WIDEST_INT) < 8 ? 0 : |
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
958 (unsigned HOST_WIDEST_INT)0x08070605 << 32 | 0x04030201); |
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
959 |
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
960 if (n->size < (int)sizeof (HOST_WIDEST_INT)) |
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
961 n->n &= ((unsigned HOST_WIDEST_INT)1 << |
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
962 (n->size * BITS_PER_UNIT)) - 1; |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
963 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
964 source_expr1 = rhs1; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
965 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
966 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
967 switch (code) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
968 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
969 case BIT_AND_EXPR: |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
970 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
971 int i; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
972 unsigned HOST_WIDEST_INT val = widest_int_cst_value (rhs2); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
973 unsigned HOST_WIDEST_INT tmp = val; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
974 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
975 /* Only constants masking full bytes are allowed. */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
976 for (i = 0; i < n->size; i++, tmp >>= BITS_PER_UNIT) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
977 if ((tmp & 0xff) != 0 && (tmp & 0xff) != 0xff) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
978 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
979 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
980 n->n &= val; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
981 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
982 break; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
983 case LSHIFT_EXPR: |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
984 case RSHIFT_EXPR: |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
985 case LROTATE_EXPR: |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
986 case RROTATE_EXPR: |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
987 if (!do_shift_rotate (code, n, (int)TREE_INT_CST_LOW (rhs2))) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
988 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
989 break; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
990 CASE_CONVERT: |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
991 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
992 int type_size; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
993 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
994 type_size = TYPE_PRECISION (gimple_expr_type (stmt)); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
995 if (type_size % BITS_PER_UNIT != 0) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
996 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
997 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
998 if (type_size / BITS_PER_UNIT < (int)(sizeof (HOST_WIDEST_INT))) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
999 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1000 /* If STMT casts to a smaller type mask out the bits not |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1001 belonging to the target type. */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1002 n->n &= ((unsigned HOST_WIDEST_INT)1 << type_size) - 1; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1003 } |
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
1004 n->size = type_size / BITS_PER_UNIT; |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1005 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1006 break; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1007 default: |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1008 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1009 }; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1010 return verify_symbolic_number_p (n, stmt) ? source_expr1 : NULL; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1011 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1012 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1013 /* Handle binary rhs. */ |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1014 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1015 if (rhs_class == GIMPLE_BINARY_RHS) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1016 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1017 struct symbolic_number n1, n2; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1018 tree source_expr2; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1019 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1020 if (code != BIT_IOR_EXPR) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1021 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1022 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1023 if (TREE_CODE (rhs2) != SSA_NAME) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1024 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1025 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1026 rhs2_stmt = SSA_NAME_DEF_STMT (rhs2); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1027 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1028 switch (code) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1029 { |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1030 case BIT_IOR_EXPR: |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1031 source_expr1 = find_bswap_1 (rhs1_stmt, &n1, limit - 1); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1032 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1033 if (!source_expr1) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1034 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1035 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1036 source_expr2 = find_bswap_1 (rhs2_stmt, &n2, limit - 1); |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1037 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1038 if (source_expr1 != source_expr2 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1039 || n1.size != n2.size) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1040 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1041 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1042 n->size = n1.size; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1043 n->n = n1.n | n2.n; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1044 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1045 if (!verify_symbolic_number_p (n, stmt)) |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1046 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1047 |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1048 break; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1049 default: |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1050 return NULL_TREE; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1051 } |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1052 return source_expr1; |
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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|
1053 } |
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|
1054 return NULL_TREE; |
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|
1055 } |
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diff
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|
1056 |
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47
diff
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|
1057 /* Check if STMT completes a bswap implementation consisting of ORs, |
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47
diff
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|
1058 SHIFTs and ANDs. Return the source tree expression on which the |
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update it from 4.4.3 to 4.5.0
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47
diff
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|
1059 byte swap is performed and NULL if no bswap was found. */ |
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diff
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|
1060 |
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update it from 4.4.3 to 4.5.0
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diff
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|
1061 static tree |
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47
diff
changeset
|
1062 find_bswap (gimple stmt) |
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diff
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|
1063 { |
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update it from 4.4.3 to 4.5.0
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parents:
47
diff
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|
1064 /* The number which the find_bswap result should match in order to |
63
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55
diff
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|
1065 have a full byte swap. The number is shifted to the left according |
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55
diff
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|
1066 to the size of the symbolic number before using it. */ |
55
77e2b8dfacca
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diff
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|
1067 unsigned HOST_WIDEST_INT cmp = |
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diff
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|
1068 sizeof (HOST_WIDEST_INT) < 8 ? 0 : |
63
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1069 (unsigned HOST_WIDEST_INT)0x01020304 << 32 | 0x05060708; |
55
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|
1070 |
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diff
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|
1071 struct symbolic_number n; |
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diff
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|
1072 tree source_expr; |
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diff
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|
1073 |
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diff
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|
1074 /* The last parameter determines the depth search limit. It usually |
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|
1075 correlates directly to the number of bytes to be touched. We |
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diff
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|
1076 increase that number by one here in order to also cover signed -> |
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diff
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|
1077 unsigned conversions of the src operand as can be seen in |
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|
1078 libgcc. */ |
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1079 source_expr = find_bswap_1 (stmt, &n, |
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diff
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|
1080 TREE_INT_CST_LOW ( |
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|
1081 TYPE_SIZE_UNIT (gimple_expr_type (stmt))) + 1); |
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|
1082 |
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|
1083 if (!source_expr) |
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1084 return NULL_TREE; |
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|
1085 |
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|
1086 /* Zero out the extra bits of N and CMP. */ |
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|
1087 if (n.size < (int)sizeof (HOST_WIDEST_INT)) |
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|
1088 { |
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|
1089 unsigned HOST_WIDEST_INT mask = |
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|
1090 ((unsigned HOST_WIDEST_INT)1 << (n.size * BITS_PER_UNIT)) - 1; |
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|
1091 |
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diff
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|
1092 n.n &= mask; |
63
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parents:
55
diff
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|
1093 cmp >>= (sizeof (HOST_WIDEST_INT) - n.size) * BITS_PER_UNIT; |
55
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|
1094 } |
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|
1095 |
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|
1096 /* A complete byte swap should make the symbolic number to start |
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diff
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|
1097 with the largest digit in the highest order byte. */ |
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|
1098 if (cmp != n.n) |
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|
1099 return NULL_TREE; |
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|
1100 |
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|
1101 return source_expr; |
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|
1102 } |
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|
1103 |
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diff
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|
1104 /* Find manual byte swap implementations and turn them into a bswap |
77e2b8dfacca
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47
diff
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|
1105 builtin invokation. */ |
0 | 1106 |
1107 static unsigned int | |
55
77e2b8dfacca
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|
1108 execute_optimize_bswap (void) |
0 | 1109 { |
1110 basic_block bb; | |
55
77e2b8dfacca
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parents:
47
diff
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|
1111 bool bswap32_p, bswap64_p; |
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47
diff
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|
1112 bool changed = false; |
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diff
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|
1113 tree bswap32_type = NULL_TREE, bswap64_type = NULL_TREE; |
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|
1114 |
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diff
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|
1115 if (BITS_PER_UNIT != 8) |
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|
1116 return 0; |
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|
1117 |
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diff
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|
1118 if (sizeof (HOST_WIDEST_INT) < 8) |
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|
1119 return 0; |
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|
1120 |
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|
1121 bswap32_p = (built_in_decls[BUILT_IN_BSWAP32] |
67
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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63
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|
1122 && optab_handler (bswap_optab, SImode) != CODE_FOR_nothing); |
55
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diff
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|
1123 bswap64_p = (built_in_decls[BUILT_IN_BSWAP64] |
67
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
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|
1124 && (optab_handler (bswap_optab, DImode) != CODE_FOR_nothing |
63
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55
diff
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|
1125 || (bswap32_p && word_mode == SImode))); |
55
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diff
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|
1126 |
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diff
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|
1127 if (!bswap32_p && !bswap64_p) |
77e2b8dfacca
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diff
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|
1128 return 0; |
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|
1129 |
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47
diff
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|
1130 /* Determine the argument type of the builtins. The code later on |
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diff
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|
1131 assumes that the return and argument type are the same. */ |
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47
diff
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|
1132 if (bswap32_p) |
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diff
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|
1133 { |
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|
1134 tree fndecl = built_in_decls[BUILT_IN_BSWAP32]; |
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diff
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|
1135 bswap32_type = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (fndecl))); |
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|
1136 } |
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|
1137 |
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diff
changeset
|
1138 if (bswap64_p) |
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diff
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|
1139 { |
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diff
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|
1140 tree fndecl = built_in_decls[BUILT_IN_BSWAP64]; |
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|
1141 bswap64_type = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (fndecl))); |
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|
1142 } |
0 | 1143 |
1144 FOR_EACH_BB (bb) | |
1145 { | |
1146 gimple_stmt_iterator gsi; | |
1147 | |
1148 for (gsi = gsi_after_labels (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
1149 { | |
1150 gimple stmt = gsi_stmt (gsi); | |
55
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|
1151 tree bswap_src, bswap_type; |
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|
1152 tree bswap_tmp; |
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diff
changeset
|
1153 tree fndecl = NULL_TREE; |
77e2b8dfacca
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|
1154 int type_size; |
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|
1155 gimple call; |
0 | 1156 |
55
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diff
changeset
|
1157 if (!is_gimple_assign (stmt) |
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|
1158 || gimple_assign_rhs_code (stmt) != BIT_IOR_EXPR) |
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diff
changeset
|
1159 continue; |
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|
1160 |
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changeset
|
1161 type_size = TYPE_PRECISION (gimple_expr_type (stmt)); |
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|
1162 |
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47
diff
changeset
|
1163 switch (type_size) |
0 | 1164 { |
55
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diff
changeset
|
1165 case 32: |
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47
diff
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|
1166 if (bswap32_p) |
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|
1167 { |
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changeset
|
1168 fndecl = built_in_decls[BUILT_IN_BSWAP32]; |
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1169 bswap_type = bswap32_type; |
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1170 } |
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|
1171 break; |
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diff
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|
1172 case 64: |
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diff
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|
1173 if (bswap64_p) |
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1174 { |
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1175 fndecl = built_in_decls[BUILT_IN_BSWAP64]; |
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1176 bswap_type = bswap64_type; |
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1177 } |
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1178 break; |
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1179 default: |
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1180 continue; |
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1181 } |
0 | 1182 |
55
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1183 if (!fndecl) |
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1184 continue; |
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1185 |
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1186 bswap_src = find_bswap (stmt); |
0 | 1187 |
55
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1188 if (!bswap_src) |
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1189 continue; |
0 | 1190 |
55
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1191 changed = true; |
0 | 1192 |
55
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1193 bswap_tmp = bswap_src; |
0 | 1194 |
55
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1195 /* Convert the src expression if necessary. */ |
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1196 if (!useless_type_conversion_p (TREE_TYPE (bswap_tmp), bswap_type)) |
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1197 { |
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1198 gimple convert_stmt; |
0 | 1199 |
55
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1200 bswap_tmp = create_tmp_var (bswap_type, "bswapsrc"); |
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1201 add_referenced_var (bswap_tmp); |
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1202 bswap_tmp = make_ssa_name (bswap_tmp, NULL); |
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1203 |
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|
1204 convert_stmt = gimple_build_assign_with_ops ( |
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1205 CONVERT_EXPR, bswap_tmp, bswap_src, NULL); |
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|
1206 gsi_insert_before (&gsi, convert_stmt, GSI_SAME_STMT); |
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|
1207 } |
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|
1208 |
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diff
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|
1209 call = gimple_build_call (fndecl, 1, bswap_tmp); |
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diff
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|
1210 |
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diff
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|
1211 bswap_tmp = gimple_assign_lhs (stmt); |
0 | 1212 |
55
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diff
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1213 /* Convert the result if necessary. */ |
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diff
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|
1214 if (!useless_type_conversion_p (TREE_TYPE (bswap_tmp), bswap_type)) |
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diff
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|
1215 { |
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diff
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|
1216 gimple convert_stmt; |
0 | 1217 |
55
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diff
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|
1218 bswap_tmp = create_tmp_var (bswap_type, "bswapdst"); |
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diff
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|
1219 add_referenced_var (bswap_tmp); |
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|
1220 bswap_tmp = make_ssa_name (bswap_tmp, NULL); |
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diff
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|
1221 convert_stmt = gimple_build_assign_with_ops ( |
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diff
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|
1222 CONVERT_EXPR, gimple_assign_lhs (stmt), bswap_tmp, NULL); |
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diff
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|
1223 gsi_insert_after (&gsi, convert_stmt, GSI_SAME_STMT); |
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diff
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|
1224 } |
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diff
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|
1225 |
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diff
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|
1226 gimple_call_set_lhs (call, bswap_tmp); |
0 | 1227 |
55
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diff
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|
1228 if (dump_file) |
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diff
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|
1229 { |
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update it from 4.4.3 to 4.5.0
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47
diff
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|
1230 fprintf (dump_file, "%d bit bswap implementation found at: ", |
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update it from 4.4.3 to 4.5.0
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diff
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|
1231 (int)type_size); |
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parents:
47
diff
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|
1232 print_gimple_stmt (dump_file, stmt, 0, 0); |
0 | 1233 } |
55
77e2b8dfacca
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47
diff
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|
1234 |
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diff
changeset
|
1235 gsi_insert_after (&gsi, call, GSI_SAME_STMT); |
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diff
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|
1236 gsi_remove (&gsi, true); |
0 | 1237 } |
1238 } | |
1239 | |
55
77e2b8dfacca
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parents:
47
diff
changeset
|
1240 return (changed ? TODO_dump_func | TODO_update_ssa | TODO_verify_ssa |
77e2b8dfacca
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parents:
47
diff
changeset
|
1241 | TODO_verify_stmts : 0); |
0 | 1242 } |
1243 | |
1244 static bool | |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
47
diff
changeset
|
1245 gate_optimize_bswap (void) |
0 | 1246 { |
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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47
diff
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|
1247 return flag_expensive_optimizations && optimize; |
0 | 1248 } |
1249 | |
55
77e2b8dfacca
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47
diff
changeset
|
1250 struct gimple_opt_pass pass_optimize_bswap = |
0 | 1251 { |
1252 { | |
1253 GIMPLE_PASS, | |
55
77e2b8dfacca
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47
diff
changeset
|
1254 "bswap", /* name */ |
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update it from 4.4.3 to 4.5.0
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47
diff
changeset
|
1255 gate_optimize_bswap, /* gate */ |
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47
diff
changeset
|
1256 execute_optimize_bswap, /* execute */ |
0 | 1257 NULL, /* sub */ |
1258 NULL, /* next */ | |
1259 0, /* static_pass_number */ | |
55
77e2b8dfacca
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47
diff
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|
1260 TV_NONE, /* tv_id */ |
0 | 1261 PROP_ssa, /* properties_required */ |
1262 0, /* properties_provided */ | |
1263 0, /* properties_destroyed */ | |
1264 0, /* todo_flags_start */ | |
55
77e2b8dfacca
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diff
changeset
|
1265 0 /* todo_flags_finish */ |
0 | 1266 } |
1267 }; | |
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
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55
diff
changeset
|
1268 |
67
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
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|
1269 /* Return true if RHS is a suitable operand for a widening multiplication. |
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diff
changeset
|
1270 There are two cases: |
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|
1271 |
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|
1272 - RHS makes some value twice as wide. Store that value in *NEW_RHS_OUT |
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diff
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|
1273 if so, and store its type in *TYPE_OUT. |
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|
1274 |
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diff
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|
1275 - RHS is an integer constant. Store that value in *NEW_RHS_OUT if so, |
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diff
changeset
|
1276 but leave *TYPE_OUT untouched. */ |
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|
1277 |
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|
1278 static bool |
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|
1279 is_widening_mult_rhs_p (tree rhs, tree *type_out, tree *new_rhs_out) |
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1280 { |
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|
1281 gimple stmt; |
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changeset
|
1282 tree type, type1, rhs1; |
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|
1283 enum tree_code rhs_code; |
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|
1284 |
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|
1285 if (TREE_CODE (rhs) == SSA_NAME) |
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|
1286 { |
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|
1287 type = TREE_TYPE (rhs); |
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|
1288 stmt = SSA_NAME_DEF_STMT (rhs); |
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|
1289 if (!is_gimple_assign (stmt)) |
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|
1290 return false; |
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|
1291 |
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|
1292 rhs_code = gimple_assign_rhs_code (stmt); |
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|
1293 if (TREE_CODE (type) == INTEGER_TYPE |
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1294 ? !CONVERT_EXPR_CODE_P (rhs_code) |
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|
1295 : rhs_code != FIXED_CONVERT_EXPR) |
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1296 return false; |
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1297 |
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1298 rhs1 = gimple_assign_rhs1 (stmt); |
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1299 type1 = TREE_TYPE (rhs1); |
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1300 if (TREE_CODE (type1) != TREE_CODE (type) |
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1301 || TYPE_PRECISION (type1) * 2 != TYPE_PRECISION (type)) |
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1302 return false; |
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1303 |
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1304 *new_rhs_out = rhs1; |
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1305 *type_out = type1; |
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1306 return true; |
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1307 } |
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1308 |
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1309 if (TREE_CODE (rhs) == INTEGER_CST) |
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|
1310 { |
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1311 *new_rhs_out = rhs; |
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1312 *type_out = NULL; |
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1313 return true; |
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1314 } |
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1315 |
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1316 return false; |
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1317 } |
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1318 |
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|
1319 /* Return true if STMT performs a widening multiplication. If so, |
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1320 store the unwidened types of the operands in *TYPE1_OUT and *TYPE2_OUT |
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1321 respectively. Also fill *RHS1_OUT and *RHS2_OUT such that converting |
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1322 those operands to types *TYPE1_OUT and *TYPE2_OUT would give the |
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|
1323 operands of the multiplication. */ |
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1324 |
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|
1325 static bool |
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1326 is_widening_mult_p (gimple stmt, |
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1327 tree *type1_out, tree *rhs1_out, |
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1328 tree *type2_out, tree *rhs2_out) |
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1329 { |
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1330 tree type; |
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1331 |
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1332 type = TREE_TYPE (gimple_assign_lhs (stmt)); |
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1333 if (TREE_CODE (type) != INTEGER_TYPE |
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1334 && TREE_CODE (type) != FIXED_POINT_TYPE) |
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1335 return false; |
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1336 |
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1337 if (!is_widening_mult_rhs_p (gimple_assign_rhs1 (stmt), type1_out, rhs1_out)) |
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1338 return false; |
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1339 |
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1340 if (!is_widening_mult_rhs_p (gimple_assign_rhs2 (stmt), type2_out, rhs2_out)) |
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1341 return false; |
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1342 |
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1343 if (*type1_out == NULL) |
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1344 { |
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1345 if (*type2_out == NULL || !int_fits_type_p (*rhs1_out, *type2_out)) |
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1346 return false; |
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1347 *type1_out = *type2_out; |
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1348 } |
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|
1349 |
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1350 if (*type2_out == NULL) |
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|
1351 { |
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1352 if (!int_fits_type_p (*rhs2_out, *type1_out)) |
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|
1353 return false; |
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1354 *type2_out = *type1_out; |
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|
1355 } |
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|
1356 |
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|
1357 return true; |
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|
1358 } |
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|
1359 |
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1360 /* Process a single gimple statement STMT, which has a MULT_EXPR as |
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1361 its rhs, and try to convert it into a WIDEN_MULT_EXPR. The return |
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|
1362 value is true iff we converted the statement. */ |
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|
1363 |
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|
1364 static bool |
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1365 convert_mult_to_widen (gimple stmt) |
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1366 { |
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1367 tree lhs, rhs1, rhs2, type, type1, type2; |
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1368 enum insn_code handler; |
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|
1369 |
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1370 lhs = gimple_assign_lhs (stmt); |
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1371 type = TREE_TYPE (lhs); |
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1372 if (TREE_CODE (type) != INTEGER_TYPE) |
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|
1373 return false; |
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|
1374 |
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1375 if (!is_widening_mult_p (stmt, &type1, &rhs1, &type2, &rhs2)) |
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1376 return false; |
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|
1377 |
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1378 if (TYPE_UNSIGNED (type1) && TYPE_UNSIGNED (type2)) |
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1379 handler = optab_handler (umul_widen_optab, TYPE_MODE (type)); |
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1380 else if (!TYPE_UNSIGNED (type1) && !TYPE_UNSIGNED (type2)) |
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1381 handler = optab_handler (smul_widen_optab, TYPE_MODE (type)); |
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1382 else |
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|
1383 handler = optab_handler (usmul_widen_optab, TYPE_MODE (type)); |
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|
1384 |
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1385 if (handler == CODE_FOR_nothing) |
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|
1386 return false; |
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|
1387 |
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|
1388 gimple_assign_set_rhs1 (stmt, fold_convert (type1, rhs1)); |
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1389 gimple_assign_set_rhs2 (stmt, fold_convert (type2, rhs2)); |
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1390 gimple_assign_set_rhs_code (stmt, WIDEN_MULT_EXPR); |
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1391 update_stmt (stmt); |
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1392 return true; |
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1393 } |
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|
1394 |
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1395 /* Process a single gimple statement STMT, which is found at the |
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|
1396 iterator GSI and has a either a PLUS_EXPR or a MINUS_EXPR as its |
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diff
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|
1397 rhs (given by CODE), and try to convert it into a |
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1398 WIDEN_MULT_PLUS_EXPR or a WIDEN_MULT_MINUS_EXPR. The return value |
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diff
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|
1399 is true iff we converted the statement. */ |
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diff
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|
1400 |
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diff
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|
1401 static bool |
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diff
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1402 convert_plusminus_to_widen (gimple_stmt_iterator *gsi, gimple stmt, |
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|
1403 enum tree_code code) |
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|
1404 { |
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diff
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|
1405 gimple rhs1_stmt = NULL, rhs2_stmt = NULL; |
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|
1406 tree type, type1, type2; |
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diff
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|
1407 tree lhs, rhs1, rhs2, mult_rhs1, mult_rhs2, add_rhs; |
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diff
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|
1408 enum tree_code rhs1_code = ERROR_MARK, rhs2_code = ERROR_MARK; |
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diff
changeset
|
1409 optab this_optab; |
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diff
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|
1410 enum tree_code wmult_code; |
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|
1411 |
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|
1412 lhs = gimple_assign_lhs (stmt); |
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diff
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|
1413 type = TREE_TYPE (lhs); |
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diff
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|
1414 if (TREE_CODE (type) != INTEGER_TYPE |
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|
1415 && TREE_CODE (type) != FIXED_POINT_TYPE) |
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|
1416 return false; |
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diff
changeset
|
1417 |
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diff
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|
1418 if (code == MINUS_EXPR) |
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diff
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|
1419 wmult_code = WIDEN_MULT_MINUS_EXPR; |
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|
1420 else |
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diff
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|
1421 wmult_code = WIDEN_MULT_PLUS_EXPR; |
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diff
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|
1422 |
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diff
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|
1423 rhs1 = gimple_assign_rhs1 (stmt); |
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diff
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|
1424 rhs2 = gimple_assign_rhs2 (stmt); |
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diff
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|
1425 |
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diff
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|
1426 if (TREE_CODE (rhs1) == SSA_NAME) |
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diff
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|
1427 { |
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diff
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|
1428 rhs1_stmt = SSA_NAME_DEF_STMT (rhs1); |
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diff
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|
1429 if (is_gimple_assign (rhs1_stmt)) |
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diff
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|
1430 rhs1_code = gimple_assign_rhs_code (rhs1_stmt); |
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diff
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|
1431 } |
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diff
changeset
|
1432 else |
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|
1433 return false; |
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diff
changeset
|
1434 |
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diff
changeset
|
1435 if (TREE_CODE (rhs2) == SSA_NAME) |
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diff
changeset
|
1436 { |
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diff
changeset
|
1437 rhs2_stmt = SSA_NAME_DEF_STMT (rhs2); |
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diff
changeset
|
1438 if (is_gimple_assign (rhs2_stmt)) |
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diff
changeset
|
1439 rhs2_code = gimple_assign_rhs_code (rhs2_stmt); |
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63
diff
changeset
|
1440 } |
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diff
changeset
|
1441 else |
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diff
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|
1442 return false; |
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63
diff
changeset
|
1443 |
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diff
changeset
|
1444 if (code == PLUS_EXPR && rhs1_code == MULT_EXPR) |
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63
diff
changeset
|
1445 { |
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63
diff
changeset
|
1446 if (!is_widening_mult_p (rhs1_stmt, &type1, &mult_rhs1, |
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diff
changeset
|
1447 &type2, &mult_rhs2)) |
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diff
changeset
|
1448 return false; |
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diff
changeset
|
1449 add_rhs = rhs2; |
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diff
changeset
|
1450 } |
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diff
changeset
|
1451 else if (rhs2_code == MULT_EXPR) |
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diff
changeset
|
1452 { |
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diff
changeset
|
1453 if (!is_widening_mult_p (rhs2_stmt, &type1, &mult_rhs1, |
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diff
changeset
|
1454 &type2, &mult_rhs2)) |
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diff
changeset
|
1455 return false; |
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diff
changeset
|
1456 add_rhs = rhs1; |
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diff
changeset
|
1457 } |
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diff
changeset
|
1458 else if (code == PLUS_EXPR && rhs1_code == WIDEN_MULT_EXPR) |
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diff
changeset
|
1459 { |
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diff
changeset
|
1460 mult_rhs1 = gimple_assign_rhs1 (rhs1_stmt); |
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diff
changeset
|
1461 mult_rhs2 = gimple_assign_rhs2 (rhs1_stmt); |
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diff
changeset
|
1462 type1 = TREE_TYPE (mult_rhs1); |
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diff
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|
1463 type2 = TREE_TYPE (mult_rhs2); |
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changeset
|
1464 add_rhs = rhs2; |
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diff
changeset
|
1465 } |
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diff
changeset
|
1466 else if (rhs2_code == WIDEN_MULT_EXPR) |
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diff
changeset
|
1467 { |
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diff
changeset
|
1468 mult_rhs1 = gimple_assign_rhs1 (rhs2_stmt); |
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diff
changeset
|
1469 mult_rhs2 = gimple_assign_rhs2 (rhs2_stmt); |
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diff
changeset
|
1470 type1 = TREE_TYPE (mult_rhs1); |
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|
1471 type2 = TREE_TYPE (mult_rhs2); |
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changeset
|
1472 add_rhs = rhs1; |
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diff
changeset
|
1473 } |
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changeset
|
1474 else |
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diff
changeset
|
1475 return false; |
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diff
changeset
|
1476 |
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diff
changeset
|
1477 if (TYPE_UNSIGNED (type1) != TYPE_UNSIGNED (type2)) |
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diff
changeset
|
1478 return false; |
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changeset
|
1479 |
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1480 /* Verify that the machine can perform a widening multiply |
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1481 accumulate in this mode/signedness combination, otherwise |
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1482 this transformation is likely to pessimize code. */ |
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1483 this_optab = optab_for_tree_code (wmult_code, type1, optab_default); |
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1484 if (optab_handler (this_optab, TYPE_MODE (type)) == CODE_FOR_nothing) |
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1485 return false; |
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1486 |
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1487 /* ??? May need some type verification here? */ |
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1488 |
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1489 gimple_assign_set_rhs_with_ops_1 (gsi, wmult_code, |
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1490 fold_convert (type1, mult_rhs1), |
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1491 fold_convert (type2, mult_rhs2), |
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1492 add_rhs); |
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1493 update_stmt (gsi_stmt (*gsi)); |
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1494 return true; |
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1495 } |
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1496 |
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1497 /* Combine the multiplication at MUL_STMT with operands MULOP1 and MULOP2 |
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1498 with uses in additions and subtractions to form fused multiply-add |
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1499 operations. Returns true if successful and MUL_STMT should be removed. */ |
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1500 |
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1501 static bool |
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1502 convert_mult_to_fma (gimple mul_stmt, tree op1, tree op2) |
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1503 { |
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1504 tree mul_result = gimple_get_lhs (mul_stmt); |
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1505 tree type = TREE_TYPE (mul_result); |
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1506 gimple use_stmt, neguse_stmt, fma_stmt; |
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1507 use_operand_p use_p; |
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1508 imm_use_iterator imm_iter; |
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1509 |
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1510 if (FLOAT_TYPE_P (type) |
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1511 && flag_fp_contract_mode == FP_CONTRACT_OFF) |
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1512 return false; |
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1513 |
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1514 /* We don't want to do bitfield reduction ops. */ |
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1515 if (INTEGRAL_TYPE_P (type) |
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1516 && (TYPE_PRECISION (type) |
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1517 != GET_MODE_PRECISION (TYPE_MODE (type)))) |
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1518 return false; |
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1519 |
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1520 /* If the target doesn't support it, don't generate it. We assume that |
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1521 if fma isn't available then fms, fnma or fnms are not either. */ |
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1522 if (optab_handler (fma_optab, TYPE_MODE (type)) == CODE_FOR_nothing) |
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1523 return false; |
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1524 |
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1525 /* Make sure that the multiplication statement becomes dead after |
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1526 the transformation, thus that all uses are transformed to FMAs. |
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1527 This means we assume that an FMA operation has the same cost |
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1528 as an addition. */ |
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1529 FOR_EACH_IMM_USE_FAST (use_p, imm_iter, mul_result) |
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1530 { |
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1531 enum tree_code use_code; |
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1532 tree result = mul_result; |
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1533 bool negate_p = false; |
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1534 |
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1535 use_stmt = USE_STMT (use_p); |
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1536 |
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1537 if (is_gimple_debug (use_stmt)) |
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1538 continue; |
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1539 |
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1540 /* For now restrict this operations to single basic blocks. In theory |
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1541 we would want to support sinking the multiplication in |
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1542 m = a*b; |
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1543 if () |
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1544 ma = m + c; |
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1545 else |
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1546 d = m; |
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1547 to form a fma in the then block and sink the multiplication to the |
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1548 else block. */ |
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1549 if (gimple_bb (use_stmt) != gimple_bb (mul_stmt)) |
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1550 return false; |
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1551 |
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1552 if (!is_gimple_assign (use_stmt)) |
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1553 return false; |
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1554 |
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1555 use_code = gimple_assign_rhs_code (use_stmt); |
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1556 |
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1557 /* A negate on the multiplication leads to FNMA. */ |
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1558 if (use_code == NEGATE_EXPR) |
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1559 { |
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1560 ssa_op_iter iter; |
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1561 tree use; |
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1562 |
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1563 result = gimple_assign_lhs (use_stmt); |
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1564 |
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1565 /* Make sure the negate statement becomes dead with this |
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1566 single transformation. */ |
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1567 if (!single_imm_use (gimple_assign_lhs (use_stmt), |
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1568 &use_p, &neguse_stmt)) |
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1569 return false; |
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1570 |
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1571 /* Make sure the multiplication isn't also used on that stmt. */ |
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|
1572 FOR_EACH_SSA_TREE_OPERAND (use, neguse_stmt, iter, SSA_OP_USE) |
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1573 if (use == mul_result) |
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1574 return false; |
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1575 |
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1576 /* Re-validate. */ |
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1577 use_stmt = neguse_stmt; |
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1578 if (gimple_bb (use_stmt) != gimple_bb (mul_stmt)) |
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1579 return false; |
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1580 if (!is_gimple_assign (use_stmt)) |
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1581 return false; |
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1582 |
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1583 use_code = gimple_assign_rhs_code (use_stmt); |
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1584 negate_p = true; |
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1585 } |
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1586 |
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1587 switch (use_code) |
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1588 { |
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1589 case MINUS_EXPR: |
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1590 if (gimple_assign_rhs2 (use_stmt) == result) |
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1591 negate_p = !negate_p; |
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1592 break; |
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1593 case PLUS_EXPR: |
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1594 break; |
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1595 default: |
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1596 /* FMA can only be formed from PLUS and MINUS. */ |
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1597 return false; |
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1598 } |
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1599 |
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1600 /* We can't handle a * b + a * b. */ |
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1601 if (gimple_assign_rhs1 (use_stmt) == gimple_assign_rhs2 (use_stmt)) |
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1602 return false; |
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1603 |
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1604 /* While it is possible to validate whether or not the exact form |
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1605 that we've recognized is available in the backend, the assumption |
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1606 is that the transformation is never a loss. For instance, suppose |
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1607 the target only has the plain FMA pattern available. Consider |
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1608 a*b-c -> fma(a,b,-c): we've exchanged MUL+SUB for FMA+NEG, which |
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1609 is still two operations. Consider -(a*b)-c -> fma(-a,b,-c): we |
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1610 still have 3 operations, but in the FMA form the two NEGs are |
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1611 independant and could be run in parallel. */ |
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1612 } |
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1613 |
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1614 FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, mul_result) |
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1615 { |
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1616 gimple_stmt_iterator gsi = gsi_for_stmt (use_stmt); |
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1617 enum tree_code use_code; |
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1618 tree addop, mulop1 = op1, result = mul_result; |
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1619 bool negate_p = false; |
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1620 |
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1621 if (is_gimple_debug (use_stmt)) |
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1622 continue; |
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1623 |
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1624 use_code = gimple_assign_rhs_code (use_stmt); |
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1625 if (use_code == NEGATE_EXPR) |
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1626 { |
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1627 result = gimple_assign_lhs (use_stmt); |
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1628 single_imm_use (gimple_assign_lhs (use_stmt), &use_p, &neguse_stmt); |
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1629 gsi_remove (&gsi, true); |
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1630 release_defs (use_stmt); |
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1631 |
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1632 use_stmt = neguse_stmt; |
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1633 gsi = gsi_for_stmt (use_stmt); |
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1634 use_code = gimple_assign_rhs_code (use_stmt); |
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1635 negate_p = true; |
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1636 } |
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1637 |
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1638 if (gimple_assign_rhs1 (use_stmt) == result) |
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1639 { |
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1640 addop = gimple_assign_rhs2 (use_stmt); |
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1641 /* a * b - c -> a * b + (-c) */ |
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1642 if (gimple_assign_rhs_code (use_stmt) == MINUS_EXPR) |
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1643 addop = force_gimple_operand_gsi (&gsi, |
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1644 build1 (NEGATE_EXPR, |
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1645 type, addop), |
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1646 true, NULL_TREE, true, |
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1647 GSI_SAME_STMT); |
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1648 } |
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1649 else |
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1650 { |
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1651 addop = gimple_assign_rhs1 (use_stmt); |
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1652 /* a - b * c -> (-b) * c + a */ |
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1653 if (gimple_assign_rhs_code (use_stmt) == MINUS_EXPR) |
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1654 negate_p = !negate_p; |
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1655 } |
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1656 |
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1657 if (negate_p) |
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1658 mulop1 = force_gimple_operand_gsi (&gsi, |
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1659 build1 (NEGATE_EXPR, |
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1660 type, mulop1), |
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|
1661 true, NULL_TREE, true, |
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|
1662 GSI_SAME_STMT); |
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1663 |
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1664 fma_stmt = gimple_build_assign_with_ops3 (FMA_EXPR, |
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1665 gimple_assign_lhs (use_stmt), |
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|
1666 mulop1, op2, |
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|
1667 addop); |
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|
1668 gsi_replace (&gsi, fma_stmt, true); |
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|
1669 } |
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|
1670 |
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|
1671 return true; |
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|
1672 } |
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|
1673 |
63
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|
1674 /* Find integer multiplications where the operands are extended from |
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1675 smaller types, and replace the MULT_EXPR with a WIDEN_MULT_EXPR |
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|
1676 where appropriate. */ |
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|
1677 |
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|
1678 static unsigned int |
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|
1679 execute_optimize_widening_mul (void) |
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|
1680 { |
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|
1681 basic_block bb; |
67
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|
1682 bool cfg_changed = false; |
63
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|
1683 |
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|
1684 FOR_EACH_BB (bb) |
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|
1685 { |
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|
1686 gimple_stmt_iterator gsi; |
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|
1687 |
67
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1688 for (gsi = gsi_after_labels (bb); !gsi_end_p (gsi);) |
63
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|
1689 { |
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1690 gimple stmt = gsi_stmt (gsi); |
67
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|
1691 enum tree_code code; |
63
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|
1692 |
67
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|
1693 if (is_gimple_assign (stmt)) |
63
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|
1694 { |
67
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|
1695 code = gimple_assign_rhs_code (stmt); |
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|
1696 switch (code) |
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|
1697 { |
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|
1698 case MULT_EXPR: |
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|
1699 if (!convert_mult_to_widen (stmt) |
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|
1700 && convert_mult_to_fma (stmt, |
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|
1701 gimple_assign_rhs1 (stmt), |
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|
1702 gimple_assign_rhs2 (stmt))) |
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|
1703 { |
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|
1704 gsi_remove (&gsi, true); |
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|
1705 release_defs (stmt); |
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|
1706 continue; |
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|
1707 } |
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|
1708 break; |
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|
1709 |
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|
1710 case PLUS_EXPR: |
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|
1711 case MINUS_EXPR: |
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|
1712 convert_plusminus_to_widen (&gsi, stmt, code); |
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|
1713 break; |
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|
1714 |
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|
1715 default:; |
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|
1716 } |
63
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|
1717 } |
67
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|
1718 else if (is_gimple_call (stmt) |
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|
1719 && gimple_call_lhs (stmt)) |
63
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|
1720 { |
67
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|
1721 tree fndecl = gimple_call_fndecl (stmt); |
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|
1722 if (fndecl |
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|
1723 && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL) |
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|
1724 { |
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|
1725 switch (DECL_FUNCTION_CODE (fndecl)) |
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|
1726 { |
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|
1727 case BUILT_IN_POWF: |
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|
1728 case BUILT_IN_POW: |
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|
1729 case BUILT_IN_POWL: |
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|
1730 if (TREE_CODE (gimple_call_arg (stmt, 1)) == REAL_CST |
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|
1731 && REAL_VALUES_EQUAL |
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|
1732 (TREE_REAL_CST (gimple_call_arg (stmt, 1)), |
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|
1733 dconst2) |
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|
1734 && convert_mult_to_fma (stmt, |
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|
1735 gimple_call_arg (stmt, 0), |
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|
1736 gimple_call_arg (stmt, 0))) |
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|
1737 { |
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|
1738 unlink_stmt_vdef (stmt); |
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|
1739 gsi_remove (&gsi, true); |
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|
1740 release_defs (stmt); |
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|
1741 if (gimple_purge_dead_eh_edges (bb)) |
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|
1742 cfg_changed = true; |
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|
1743 continue; |
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|
1744 } |
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|
1745 break; |
63
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|
1746 |
67
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changeset
|
1747 default:; |
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|
1748 } |
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|
1749 } |
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|
1750 } |
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changeset
|
1751 gsi_next (&gsi); |
63
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|
1752 } |
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|
1753 } |
67
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|
1754 |
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|
1755 return cfg_changed ? TODO_cleanup_cfg : 0; |
63
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|
1756 } |
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|
1757 |
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diff
changeset
|
1758 static bool |
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changeset
|
1759 gate_optimize_widening_mul (void) |
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changeset
|
1760 { |
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changeset
|
1761 return flag_expensive_optimizations && optimize; |
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1762 } |
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1763 |
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1764 struct gimple_opt_pass pass_optimize_widening_mul = |
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1765 { |
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1766 { |
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1767 GIMPLE_PASS, |
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1768 "widening_mul", /* name */ |
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1769 gate_optimize_widening_mul, /* gate */ |
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1770 execute_optimize_widening_mul, /* execute */ |
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1771 NULL, /* sub */ |
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1772 NULL, /* next */ |
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1773 0, /* static_pass_number */ |
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1774 TV_NONE, /* tv_id */ |
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1775 PROP_ssa, /* properties_required */ |
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1776 0, /* properties_provided */ |
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1777 0, /* properties_destroyed */ |
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1778 0, /* todo_flags_start */ |
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1779 TODO_verify_ssa |
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1780 | TODO_verify_stmts |
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1781 | TODO_dump_func |
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1782 | TODO_update_ssa /* todo_flags_finish */ |
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1783 } |
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1784 }; |