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Commit | Line | Data |
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2abae5f1 | 1 | /* Single entry single exit control flow regions. |
ddb555ed | 2 | Copyright (C) 2008, 2009, 2010, 2011 |
c75c517d | 3 | Free Software Foundation, Inc. |
2abae5f1 SP |
4 | Contributed by Jan Sjodin <jan.sjodin@amd.com> and |
5 | Sebastian Pop <sebastian.pop@amd.com>. | |
6 | ||
7 | This file is part of GCC. | |
8 | ||
9 | GCC is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3, or (at your option) | |
12 | any later version. | |
13 | ||
14 | GCC is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with GCC; see the file COPYING3. If not see | |
21 | <http://www.gnu.org/licenses/>. */ | |
22 | ||
23 | #include "config.h" | |
24 | #include "system.h" | |
25 | #include "coretypes.h" | |
cf835838 | 26 | #include "tree-pretty-print.h" |
2abae5f1 | 27 | #include "tree-flow.h" |
2abae5f1 SP |
28 | #include "cfgloop.h" |
29 | #include "tree-chrec.h" | |
30 | #include "tree-data-ref.h" | |
31 | #include "tree-scalar-evolution.h" | |
32 | #include "tree-pass.h" | |
2abae5f1 | 33 | #include "value-prof.h" |
2abae5f1 SP |
34 | #include "sese.h" |
35 | ||
36 | /* Print to stderr the element ELT. */ | |
37 | ||
38 | static void | |
39 | debug_rename_elt (rename_map_elt elt) | |
40 | { | |
41 | fprintf (stderr, "("); | |
42 | print_generic_expr (stderr, elt->old_name, 0); | |
43 | fprintf (stderr, ", "); | |
44 | print_generic_expr (stderr, elt->expr, 0); | |
45 | fprintf (stderr, ")\n"); | |
46 | } | |
47 | ||
48 | /* Helper function for debug_rename_map. */ | |
49 | ||
50 | static int | |
51 | debug_rename_map_1 (void **slot, void *s ATTRIBUTE_UNUSED) | |
52 | { | |
53 | struct rename_map_elt_s *entry = (struct rename_map_elt_s *) *slot; | |
54 | debug_rename_elt (entry); | |
55 | return 1; | |
56 | } | |
57 | ||
32e68db9 | 58 | /* Print to stderr all the elements of RENAME_MAP. */ |
2abae5f1 | 59 | |
24e47c76 | 60 | DEBUG_FUNCTION void |
32e68db9 | 61 | debug_rename_map (htab_t rename_map) |
2abae5f1 | 62 | { |
32e68db9 | 63 | htab_traverse (rename_map, debug_rename_map_1, NULL); |
2abae5f1 SP |
64 | } |
65 | ||
66 | /* Computes a hash function for database element ELT. */ | |
67 | ||
68 | hashval_t | |
69 | rename_map_elt_info (const void *elt) | |
70 | { | |
617531d9 | 71 | return SSA_NAME_VERSION (((const struct rename_map_elt_s *) elt)->old_name); |
2abae5f1 SP |
72 | } |
73 | ||
74 | /* Compares database elements E1 and E2. */ | |
75 | ||
76 | int | |
77 | eq_rename_map_elts (const void *e1, const void *e2) | |
78 | { | |
79 | const struct rename_map_elt_s *elt1 = (const struct rename_map_elt_s *) e1; | |
80 | const struct rename_map_elt_s *elt2 = (const struct rename_map_elt_s *) e2; | |
81 | ||
82 | return (elt1->old_name == elt2->old_name); | |
83 | } | |
84 | ||
85 | \f | |
86 | ||
87 | /* Print to stderr the element ELT. */ | |
88 | ||
89 | static void | |
90 | debug_ivtype_elt (ivtype_map_elt elt) | |
91 | { | |
92 | fprintf (stderr, "(%s, ", elt->cloog_iv); | |
93 | print_generic_expr (stderr, elt->type, 0); | |
94 | fprintf (stderr, ")\n"); | |
95 | } | |
96 | ||
97 | /* Helper function for debug_ivtype_map. */ | |
98 | ||
99 | static int | |
100 | debug_ivtype_map_1 (void **slot, void *s ATTRIBUTE_UNUSED) | |
101 | { | |
102 | struct ivtype_map_elt_s *entry = (struct ivtype_map_elt_s *) *slot; | |
103 | debug_ivtype_elt (entry); | |
104 | return 1; | |
105 | } | |
106 | ||
107 | /* Print to stderr all the elements of MAP. */ | |
108 | ||
24e47c76 | 109 | DEBUG_FUNCTION void |
2abae5f1 SP |
110 | debug_ivtype_map (htab_t map) |
111 | { | |
112 | htab_traverse (map, debug_ivtype_map_1, NULL); | |
113 | } | |
114 | ||
115 | /* Computes a hash function for database element ELT. */ | |
116 | ||
117 | hashval_t | |
118 | ivtype_map_elt_info (const void *elt) | |
119 | { | |
120 | return htab_hash_pointer (((const struct ivtype_map_elt_s *) elt)->cloog_iv); | |
121 | } | |
122 | ||
123 | /* Compares database elements E1 and E2. */ | |
124 | ||
125 | int | |
126 | eq_ivtype_map_elts (const void *e1, const void *e2) | |
127 | { | |
128 | const struct ivtype_map_elt_s *elt1 = (const struct ivtype_map_elt_s *) e1; | |
129 | const struct ivtype_map_elt_s *elt2 = (const struct ivtype_map_elt_s *) e2; | |
130 | ||
131 | return (elt1->cloog_iv == elt2->cloog_iv); | |
132 | } | |
133 | ||
134 | \f | |
135 | ||
073a8998 | 136 | /* Record LOOP as occurring in REGION. */ |
2abae5f1 SP |
137 | |
138 | static void | |
139 | sese_record_loop (sese region, loop_p loop) | |
140 | { | |
141 | if (sese_contains_loop (region, loop)) | |
142 | return; | |
143 | ||
144 | bitmap_set_bit (SESE_LOOPS (region), loop->num); | |
145 | VEC_safe_push (loop_p, heap, SESE_LOOP_NEST (region), loop); | |
146 | } | |
147 | ||
148 | /* Build the loop nests contained in REGION. Returns true when the | |
149 | operation was successful. */ | |
150 | ||
151 | void | |
152 | build_sese_loop_nests (sese region) | |
153 | { | |
154 | unsigned i; | |
155 | basic_block bb; | |
156 | struct loop *loop0, *loop1; | |
157 | ||
158 | FOR_EACH_BB (bb) | |
159 | if (bb_in_sese_p (bb, region)) | |
160 | { | |
161 | struct loop *loop = bb->loop_father; | |
162 | ||
163 | /* Only add loops if they are completely contained in the SCoP. */ | |
164 | if (loop->header == bb | |
165 | && bb_in_sese_p (loop->latch, region)) | |
166 | sese_record_loop (region, loop); | |
167 | } | |
168 | ||
169 | /* Make sure that the loops in the SESE_LOOP_NEST are ordered. It | |
170 | can be the case that an inner loop is inserted before an outer | |
171 | loop. To avoid this, semi-sort once. */ | |
ac47786e | 172 | FOR_EACH_VEC_ELT (loop_p, SESE_LOOP_NEST (region), i, loop0) |
2abae5f1 SP |
173 | { |
174 | if (VEC_length (loop_p, SESE_LOOP_NEST (region)) == i + 1) | |
175 | break; | |
176 | ||
177 | loop1 = VEC_index (loop_p, SESE_LOOP_NEST (region), i + 1); | |
178 | if (loop0->num > loop1->num) | |
179 | { | |
180 | VEC_replace (loop_p, SESE_LOOP_NEST (region), i, loop1); | |
181 | VEC_replace (loop_p, SESE_LOOP_NEST (region), i + 1, loop0); | |
182 | } | |
183 | } | |
184 | } | |
185 | ||
186 | /* For a USE in BB, if BB is outside REGION, mark the USE in the | |
187 | LIVEOUTS set. */ | |
188 | ||
189 | static void | |
190 | sese_build_liveouts_use (sese region, bitmap liveouts, basic_block bb, | |
191 | tree use) | |
192 | { | |
193 | unsigned ver; | |
194 | basic_block def_bb; | |
195 | ||
196 | if (TREE_CODE (use) != SSA_NAME) | |
197 | return; | |
198 | ||
199 | ver = SSA_NAME_VERSION (use); | |
200 | def_bb = gimple_bb (SSA_NAME_DEF_STMT (use)); | |
201 | ||
202 | if (!def_bb | |
203 | || !bb_in_sese_p (def_bb, region) | |
204 | || bb_in_sese_p (bb, region)) | |
205 | return; | |
206 | ||
207 | bitmap_set_bit (liveouts, ver); | |
208 | } | |
209 | ||
210 | /* Marks for rewrite all the SSA_NAMES defined in REGION and that are | |
211 | used in BB that is outside of the REGION. */ | |
212 | ||
213 | static void | |
214 | sese_build_liveouts_bb (sese region, bitmap liveouts, basic_block bb) | |
215 | { | |
216 | gimple_stmt_iterator bsi; | |
217 | edge e; | |
218 | edge_iterator ei; | |
219 | ssa_op_iter iter; | |
220 | use_operand_p use_p; | |
221 | ||
222 | FOR_EACH_EDGE (e, ei, bb->succs) | |
223 | for (bsi = gsi_start_phis (e->dest); !gsi_end_p (bsi); gsi_next (&bsi)) | |
224 | sese_build_liveouts_use (region, liveouts, bb, | |
225 | PHI_ARG_DEF_FROM_EDGE (gsi_stmt (bsi), e)); | |
226 | ||
227 | for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
a3201927 AO |
228 | { |
229 | gimple stmt = gsi_stmt (bsi); | |
230 | ||
231 | if (is_gimple_debug (stmt)) | |
232 | continue; | |
233 | ||
234 | FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_ALL_USES) | |
235 | sese_build_liveouts_use (region, liveouts, bb, USE_FROM_PTR (use_p)); | |
236 | } | |
237 | } | |
238 | ||
239 | /* For a USE in BB, return true if BB is outside REGION and it's not | |
240 | in the LIVEOUTS set. */ | |
241 | ||
242 | static bool | |
243 | sese_bad_liveouts_use (sese region, bitmap liveouts, basic_block bb, | |
244 | tree use) | |
245 | { | |
246 | unsigned ver; | |
247 | basic_block def_bb; | |
248 | ||
249 | if (TREE_CODE (use) != SSA_NAME) | |
250 | return false; | |
251 | ||
252 | ver = SSA_NAME_VERSION (use); | |
253 | ||
254 | /* If it's in liveouts, the variable will get a new PHI node, and | |
255 | the debug use will be properly adjusted. */ | |
256 | if (bitmap_bit_p (liveouts, ver)) | |
257 | return false; | |
258 | ||
259 | def_bb = gimple_bb (SSA_NAME_DEF_STMT (use)); | |
260 | ||
261 | if (!def_bb | |
262 | || !bb_in_sese_p (def_bb, region) | |
263 | || bb_in_sese_p (bb, region)) | |
264 | return false; | |
265 | ||
266 | return true; | |
267 | } | |
268 | ||
269 | /* Reset debug stmts that reference SSA_NAMES defined in REGION that | |
270 | are not marked as liveouts. */ | |
271 | ||
272 | static void | |
273 | sese_reset_debug_liveouts_bb (sese region, bitmap liveouts, basic_block bb) | |
274 | { | |
275 | gimple_stmt_iterator bsi; | |
276 | ssa_op_iter iter; | |
277 | use_operand_p use_p; | |
278 | ||
279 | for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
280 | { | |
281 | gimple stmt = gsi_stmt (bsi); | |
282 | ||
283 | if (!is_gimple_debug (stmt)) | |
284 | continue; | |
285 | ||
286 | FOR_EACH_SSA_USE_OPERAND (use_p, stmt, iter, SSA_OP_ALL_USES) | |
287 | if (sese_bad_liveouts_use (region, liveouts, bb, | |
288 | USE_FROM_PTR (use_p))) | |
289 | { | |
290 | gimple_debug_bind_reset_value (stmt); | |
291 | update_stmt (stmt); | |
292 | break; | |
293 | } | |
294 | } | |
2abae5f1 SP |
295 | } |
296 | ||
297 | /* Build the LIVEOUTS of REGION: the set of variables defined inside | |
298 | and used outside the REGION. */ | |
299 | ||
300 | static void | |
301 | sese_build_liveouts (sese region, bitmap liveouts) | |
302 | { | |
303 | basic_block bb; | |
304 | ||
305 | FOR_EACH_BB (bb) | |
306 | sese_build_liveouts_bb (region, liveouts, bb); | |
1c1ad7bb | 307 | if (MAY_HAVE_DEBUG_STMTS) |
a3201927 AO |
308 | FOR_EACH_BB (bb) |
309 | sese_reset_debug_liveouts_bb (region, liveouts, bb); | |
2abae5f1 SP |
310 | } |
311 | ||
312 | /* Builds a new SESE region from edges ENTRY and EXIT. */ | |
313 | ||
314 | sese | |
315 | new_sese (edge entry, edge exit) | |
316 | { | |
317 | sese region = XNEW (struct sese_s); | |
318 | ||
319 | SESE_ENTRY (region) = entry; | |
320 | SESE_EXIT (region) = exit; | |
321 | SESE_LOOPS (region) = BITMAP_ALLOC (NULL); | |
322 | SESE_LOOP_NEST (region) = VEC_alloc (loop_p, heap, 3); | |
323 | SESE_ADD_PARAMS (region) = true; | |
324 | SESE_PARAMS (region) = VEC_alloc (tree, heap, 3); | |
2abae5f1 SP |
325 | |
326 | return region; | |
327 | } | |
328 | ||
329 | /* Deletes REGION. */ | |
330 | ||
331 | void | |
332 | free_sese (sese region) | |
333 | { | |
334 | if (SESE_LOOPS (region)) | |
335 | SESE_LOOPS (region) = BITMAP_ALLOC (NULL); | |
336 | ||
337 | VEC_free (tree, heap, SESE_PARAMS (region)); | |
b8698a0f | 338 | VEC_free (loop_p, heap, SESE_LOOP_NEST (region)); |
2abae5f1 | 339 | |
2abae5f1 SP |
340 | XDELETE (region); |
341 | } | |
342 | ||
343 | /* Add exit phis for USE on EXIT. */ | |
344 | ||
345 | static void | |
346 | sese_add_exit_phis_edge (basic_block exit, tree use, edge false_e, edge true_e) | |
347 | { | |
348 | gimple phi = create_phi_node (use, exit); | |
349 | ||
350 | create_new_def_for (gimple_phi_result (phi), phi, | |
351 | gimple_phi_result_ptr (phi)); | |
e53a3e77 DC |
352 | add_phi_arg (phi, use, false_e, UNKNOWN_LOCATION, NULL); |
353 | add_phi_arg (phi, use, true_e, UNKNOWN_LOCATION, NULL); | |
2abae5f1 SP |
354 | } |
355 | ||
356 | /* Insert in the block BB phi nodes for variables defined in REGION | |
357 | and used outside the REGION. The code generation moves REGION in | |
358 | the else clause of an "if (1)" and generates code in the then | |
359 | clause that is at this point empty: | |
360 | ||
361 | | if (1) | |
362 | | empty; | |
363 | | else | |
364 | | REGION; | |
365 | */ | |
366 | ||
367 | void | |
368 | sese_insert_phis_for_liveouts (sese region, basic_block bb, | |
369 | edge false_e, edge true_e) | |
370 | { | |
371 | unsigned i; | |
372 | bitmap_iterator bi; | |
373 | bitmap liveouts = BITMAP_ALLOC (NULL); | |
374 | ||
375 | update_ssa (TODO_update_ssa); | |
376 | ||
377 | sese_build_liveouts (region, liveouts); | |
378 | EXECUTE_IF_SET_IN_BITMAP (liveouts, 0, i, bi) | |
379 | sese_add_exit_phis_edge (bb, ssa_name (i), false_e, true_e); | |
380 | BITMAP_FREE (liveouts); | |
381 | ||
382 | update_ssa (TODO_update_ssa); | |
383 | } | |
384 | ||
2e286fd2 SP |
385 | /* Returns the first successor edge of BB with EDGE_TRUE_VALUE flag set. */ |
386 | ||
387 | edge | |
388 | get_true_edge_from_guard_bb (basic_block bb) | |
389 | { | |
390 | edge e; | |
391 | edge_iterator ei; | |
392 | ||
393 | FOR_EACH_EDGE (e, ei, bb->succs) | |
394 | if (e->flags & EDGE_TRUE_VALUE) | |
395 | return e; | |
396 | ||
397 | gcc_unreachable (); | |
398 | return NULL; | |
399 | } | |
400 | ||
401 | /* Returns the first successor edge of BB with EDGE_TRUE_VALUE flag cleared. */ | |
402 | ||
403 | edge | |
404 | get_false_edge_from_guard_bb (basic_block bb) | |
405 | { | |
406 | edge e; | |
407 | edge_iterator ei; | |
408 | ||
409 | FOR_EACH_EDGE (e, ei, bb->succs) | |
410 | if (!(e->flags & EDGE_TRUE_VALUE)) | |
411 | return e; | |
412 | ||
413 | gcc_unreachable (); | |
414 | return NULL; | |
415 | } | |
416 | ||
32e68db9 | 417 | /* Returns the expression associated to OLD_NAME in RENAME_MAP. */ |
2abae5f1 SP |
418 | |
419 | static tree | |
32e68db9 | 420 | get_rename (htab_t rename_map, tree old_name) |
2abae5f1 SP |
421 | { |
422 | struct rename_map_elt_s tmp; | |
423 | PTR *slot; | |
424 | ||
c3382979 | 425 | gcc_assert (TREE_CODE (old_name) == SSA_NAME); |
2abae5f1 | 426 | tmp.old_name = old_name; |
32e68db9 | 427 | slot = htab_find_slot (rename_map, &tmp, NO_INSERT); |
2abae5f1 SP |
428 | |
429 | if (slot && *slot) | |
430 | return ((rename_map_elt) *slot)->expr; | |
431 | ||
2e286fd2 | 432 | return NULL_TREE; |
2abae5f1 SP |
433 | } |
434 | ||
32e68db9 | 435 | /* Register in RENAME_MAP the rename tuple (OLD_NAME, EXPR). */ |
2abae5f1 | 436 | |
2e286fd2 | 437 | static void |
32e68db9 | 438 | set_rename (htab_t rename_map, tree old_name, tree expr) |
2abae5f1 SP |
439 | { |
440 | struct rename_map_elt_s tmp; | |
441 | PTR *slot; | |
442 | ||
443 | if (old_name == expr) | |
444 | return; | |
445 | ||
446 | tmp.old_name = old_name; | |
32e68db9 | 447 | slot = htab_find_slot (rename_map, &tmp, INSERT); |
2abae5f1 SP |
448 | |
449 | if (!slot) | |
450 | return; | |
451 | ||
04695783 | 452 | free (*slot); |
2abae5f1 SP |
453 | |
454 | *slot = new_rename_map_elt (old_name, expr); | |
455 | } | |
456 | ||
2e286fd2 SP |
457 | /* Renames the scalar uses of the statement COPY, using the |
458 | substitution map RENAME_MAP, inserting the gimplification code at | |
459 | GSI_TGT, for the translation REGION, with the original copied | |
460 | statement in LOOP, and using the induction variable renaming map | |
bd4a54da SP |
461 | IV_MAP. Returns true when something has been renamed. GLOOG_ERROR |
462 | is set when the code generation cannot continue. */ | |
2abae5f1 | 463 | |
fd66ea1a | 464 | static bool |
2e286fd2 | 465 | rename_uses (gimple copy, htab_t rename_map, gimple_stmt_iterator *gsi_tgt, |
bd4a54da SP |
466 | sese region, loop_p loop, VEC (tree, heap) *iv_map, |
467 | bool *gloog_error) | |
2abae5f1 | 468 | { |
2abae5f1 | 469 | use_operand_p use_p; |
2e286fd2 | 470 | ssa_op_iter op_iter; |
fd66ea1a | 471 | bool changed = false; |
2abae5f1 | 472 | |
a0dd1502 SP |
473 | if (is_gimple_debug (copy)) |
474 | { | |
475 | if (gimple_debug_bind_p (copy)) | |
476 | gimple_debug_bind_reset_value (copy); | |
ddb555ed JJ |
477 | else if (gimple_debug_source_bind_p (copy)) |
478 | return false; | |
a0dd1502 SP |
479 | else |
480 | gcc_unreachable (); | |
481 | ||
fd66ea1a | 482 | return false; |
a0dd1502 SP |
483 | } |
484 | ||
2e286fd2 | 485 | FOR_EACH_SSA_USE_OPERAND (use_p, copy, op_iter, SSA_OP_ALL_USES) |
2abae5f1 | 486 | { |
2e286fd2 SP |
487 | tree old_name = USE_FROM_PTR (use_p); |
488 | tree new_expr, scev; | |
2abae5f1 SP |
489 | gimple_seq stmts; |
490 | ||
2e286fd2 SP |
491 | if (TREE_CODE (old_name) != SSA_NAME |
492 | || !is_gimple_reg (old_name) | |
493 | || SSA_NAME_IS_DEFAULT_DEF (old_name)) | |
2abae5f1 SP |
494 | continue; |
495 | ||
fd66ea1a | 496 | changed = true; |
2e286fd2 SP |
497 | new_expr = get_rename (rename_map, old_name); |
498 | if (new_expr) | |
2abae5f1 | 499 | { |
2e286fd2 SP |
500 | tree type_old_name = TREE_TYPE (old_name); |
501 | tree type_new_expr = TREE_TYPE (new_expr); | |
a3201927 | 502 | |
2e286fd2 SP |
503 | if (type_old_name != type_new_expr |
504 | || (TREE_CODE (new_expr) != SSA_NAME | |
505 | && is_gimple_reg (old_name))) | |
a3201927 | 506 | { |
a0dd1502 | 507 | tree var = create_tmp_var (type_old_name, "var"); |
a3201927 | 508 | |
2e286fd2 SP |
509 | if (type_old_name != type_new_expr) |
510 | new_expr = fold_convert (type_old_name, new_expr); | |
a3201927 | 511 | |
2e286fd2 SP |
512 | new_expr = build2 (MODIFY_EXPR, type_old_name, var, new_expr); |
513 | new_expr = force_gimple_operand (new_expr, &stmts, true, NULL); | |
514 | gsi_insert_seq_before (gsi_tgt, stmts, GSI_SAME_STMT); | |
515 | } | |
2abae5f1 | 516 | |
2e286fd2 SP |
517 | replace_exp (use_p, new_expr); |
518 | continue; | |
2abae5f1 SP |
519 | } |
520 | ||
2e286fd2 | 521 | scev = scalar_evolution_in_region (region, loop, old_name); |
2abae5f1 | 522 | |
2e286fd2 SP |
523 | /* At this point we should know the exact scev for each |
524 | scalar SSA_NAME used in the scop: all the other scalar | |
525 | SSA_NAMEs should have been translated out of SSA using | |
526 | arrays with one element. */ | |
bd4a54da SP |
527 | if (chrec_contains_undetermined (scev)) |
528 | { | |
529 | *gloog_error = true; | |
60cf26cc | 530 | new_expr = build_zero_cst (TREE_TYPE (old_name)); |
bd4a54da | 531 | } |
60cf26cc SP |
532 | else |
533 | new_expr = chrec_apply_map (scev, iv_map); | |
2abae5f1 | 534 | |
2e286fd2 SP |
535 | /* The apply should produce an expression tree containing |
536 | the uses of the new induction variables. We should be | |
537 | able to use new_expr instead of the old_name in the newly | |
538 | generated loop nest. */ | |
bd4a54da SP |
539 | if (chrec_contains_undetermined (new_expr) |
540 | || tree_contains_chrecs (new_expr, NULL)) | |
541 | { | |
542 | *gloog_error = true; | |
60cf26cc | 543 | new_expr = build_zero_cst (TREE_TYPE (old_name)); |
bd4a54da | 544 | } |
60cf26cc SP |
545 | else |
546 | /* Replace the old_name with the new_expr. */ | |
547 | new_expr = force_gimple_operand (unshare_expr (new_expr), &stmts, | |
548 | true, NULL_TREE); | |
b8698a0f | 549 | |
2e286fd2 SP |
550 | gsi_insert_seq_before (gsi_tgt, stmts, GSI_SAME_STMT); |
551 | replace_exp (use_p, new_expr); | |
c8f91fcc | 552 | |
fd66ea1a RG |
553 | if (TREE_CODE (new_expr) == INTEGER_CST |
554 | && is_gimple_assign (copy)) | |
c8f91fcc | 555 | { |
c8f91fcc SP |
556 | tree rhs = gimple_assign_rhs1 (copy); |
557 | ||
c8f91fcc SP |
558 | if (TREE_CODE (rhs) == ADDR_EXPR) |
559 | recompute_tree_invariant_for_addr_expr (rhs); | |
560 | } | |
561 | ||
2e286fd2 | 562 | set_rename (rename_map, old_name, new_expr); |
2abae5f1 | 563 | } |
fd66ea1a RG |
564 | |
565 | return changed; | |
2abae5f1 SP |
566 | } |
567 | ||
2e286fd2 | 568 | /* Duplicates the statements of basic block BB into basic block NEW_BB |
bd4a54da SP |
569 | and compute the new induction variables according to the IV_MAP. |
570 | GLOOG_ERROR is set when the code generation cannot continue. */ | |
2abae5f1 | 571 | |
b8698a0f | 572 | static void |
2e286fd2 SP |
573 | graphite_copy_stmts_from_block (basic_block bb, basic_block new_bb, |
574 | htab_t rename_map, | |
bd4a54da SP |
575 | VEC (tree, heap) *iv_map, sese region, |
576 | bool *gloog_error) | |
2abae5f1 SP |
577 | { |
578 | gimple_stmt_iterator gsi, gsi_tgt; | |
2e286fd2 | 579 | loop_p loop = bb->loop_father; |
2abae5f1 SP |
580 | |
581 | gsi_tgt = gsi_start_bb (new_bb); | |
582 | for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
583 | { | |
584 | def_operand_p def_p; | |
585 | ssa_op_iter op_iter; | |
2abae5f1 SP |
586 | gimple stmt = gsi_stmt (gsi); |
587 | gimple copy; | |
2e286fd2 SP |
588 | tree lhs; |
589 | ||
590 | /* Do not copy labels or conditions. */ | |
591 | if (gimple_code (stmt) == GIMPLE_LABEL | |
592 | || gimple_code (stmt) == GIMPLE_COND) | |
593 | continue; | |
2abae5f1 | 594 | |
2e286fd2 SP |
595 | /* Do not copy induction variables. */ |
596 | if (is_gimple_assign (stmt) | |
597 | && (lhs = gimple_assign_lhs (stmt)) | |
598 | && TREE_CODE (lhs) == SSA_NAME | |
599 | && is_gimple_reg (lhs) | |
600 | && scev_analyzable_p (lhs, region)) | |
2abae5f1 SP |
601 | continue; |
602 | ||
603 | /* Create a new copy of STMT and duplicate STMT's virtual | |
604 | operands. */ | |
605 | copy = gimple_copy (stmt); | |
606 | gsi_insert_after (&gsi_tgt, copy, GSI_NEW_STMT); | |
607 | mark_sym_for_renaming (gimple_vop (cfun)); | |
608 | ||
1d65f45c | 609 | maybe_duplicate_eh_stmt (copy, stmt); |
2abae5f1 SP |
610 | gimple_duplicate_stmt_histograms (cfun, copy, cfun, stmt); |
611 | ||
612 | /* Create new names for all the definitions created by COPY and | |
613 | add replacement mappings for each new name. */ | |
614 | FOR_EACH_SSA_DEF_OPERAND (def_p, copy, op_iter, SSA_OP_ALL_DEFS) | |
2e286fd2 SP |
615 | { |
616 | tree old_name = DEF_FROM_PTR (def_p); | |
617 | tree new_name = create_new_def_for (old_name, copy, def_p); | |
32e68db9 | 618 | set_rename (rename_map, old_name, new_name); |
2e286fd2 SP |
619 | } |
620 | ||
bd4a54da SP |
621 | if (rename_uses (copy, rename_map, &gsi_tgt, region, loop, iv_map, |
622 | gloog_error)) | |
59401b92 RG |
623 | { |
624 | gcc_assert (gsi_stmt (gsi_tgt) == copy); | |
625 | fold_stmt_inplace (&gsi_tgt); | |
626 | } | |
2e286fd2 SP |
627 | |
628 | update_stmt (copy); | |
2abae5f1 SP |
629 | } |
630 | } | |
631 | ||
632 | /* Copies BB and includes in the copied BB all the statements that can | |
633 | be reached following the use-def chains from the memory accesses, | |
bd4a54da SP |
634 | and returns the next edge following this new block. GLOOG_ERROR is |
635 | set when the code generation cannot continue. */ | |
b8698a0f | 636 | |
2abae5f1 SP |
637 | edge |
638 | copy_bb_and_scalar_dependences (basic_block bb, sese region, | |
bd4a54da SP |
639 | edge next_e, VEC (tree, heap) *iv_map, |
640 | bool *gloog_error) | |
2abae5f1 SP |
641 | { |
642 | basic_block new_bb = split_edge (next_e); | |
2e286fd2 SP |
643 | htab_t rename_map = htab_create (10, rename_map_elt_info, |
644 | eq_rename_map_elts, free); | |
2abae5f1 SP |
645 | |
646 | next_e = single_succ_edge (new_bb); | |
bd4a54da SP |
647 | graphite_copy_stmts_from_block (bb, new_bb, rename_map, iv_map, region, |
648 | gloog_error); | |
2abae5f1 | 649 | remove_phi_nodes (new_bb); |
2e286fd2 | 650 | htab_delete (rename_map); |
2abae5f1 SP |
651 | |
652 | return next_e; | |
653 | } | |
654 | ||
655 | /* Returns the outermost loop in SCOP that contains BB. */ | |
656 | ||
657 | struct loop * | |
658 | outermost_loop_in_sese (sese region, basic_block bb) | |
659 | { | |
660 | struct loop *nest; | |
661 | ||
662 | nest = bb->loop_father; | |
663 | while (loop_outer (nest) | |
664 | && loop_in_sese_p (loop_outer (nest), region)) | |
665 | nest = loop_outer (nest); | |
666 | ||
667 | return nest; | |
668 | } | |
669 | ||
670 | /* Sets the false region of an IF_REGION to REGION. */ | |
671 | ||
672 | void | |
673 | if_region_set_false_region (ifsese if_region, sese region) | |
674 | { | |
675 | basic_block condition = if_region_get_condition_block (if_region); | |
676 | edge false_edge = get_false_edge_from_guard_bb (condition); | |
677 | basic_block dummy = false_edge->dest; | |
678 | edge entry_region = SESE_ENTRY (region); | |
679 | edge exit_region = SESE_EXIT (region); | |
680 | basic_block before_region = entry_region->src; | |
681 | basic_block last_in_region = exit_region->src; | |
682 | void **slot = htab_find_slot_with_hash (current_loops->exits, exit_region, | |
683 | htab_hash_pointer (exit_region), | |
684 | NO_INSERT); | |
685 | ||
686 | entry_region->flags = false_edge->flags; | |
687 | false_edge->flags = exit_region->flags; | |
688 | ||
689 | redirect_edge_pred (entry_region, condition); | |
690 | redirect_edge_pred (exit_region, before_region); | |
691 | redirect_edge_pred (false_edge, last_in_region); | |
692 | redirect_edge_succ (false_edge, single_succ (dummy)); | |
693 | delete_basic_block (dummy); | |
694 | ||
695 | exit_region->flags = EDGE_FALLTHRU; | |
696 | recompute_all_dominators (); | |
697 | ||
698 | SESE_EXIT (region) = false_edge; | |
8c54631d | 699 | |
04695783 | 700 | free (if_region->false_region); |
2abae5f1 SP |
701 | if_region->false_region = region; |
702 | ||
703 | if (slot) | |
704 | { | |
a9429e29 | 705 | struct loop_exit *loop_exit = ggc_alloc_cleared_loop_exit (); |
2abae5f1 SP |
706 | |
707 | memcpy (loop_exit, *((struct loop_exit **) slot), sizeof (struct loop_exit)); | |
708 | htab_clear_slot (current_loops->exits, slot); | |
709 | ||
710 | slot = htab_find_slot_with_hash (current_loops->exits, false_edge, | |
711 | htab_hash_pointer (false_edge), | |
712 | INSERT); | |
713 | loop_exit->e = false_edge; | |
714 | *slot = loop_exit; | |
715 | false_edge->src->loop_father->exits->next = loop_exit; | |
716 | } | |
717 | } | |
718 | ||
719 | /* Creates an IFSESE with CONDITION on edge ENTRY. */ | |
720 | ||
086058c2 | 721 | static ifsese |
2abae5f1 SP |
722 | create_if_region_on_edge (edge entry, tree condition) |
723 | { | |
724 | edge e; | |
725 | edge_iterator ei; | |
8c54631d SP |
726 | sese sese_region = XNEW (struct sese_s); |
727 | sese true_region = XNEW (struct sese_s); | |
728 | sese false_region = XNEW (struct sese_s); | |
729 | ifsese if_region = XNEW (struct ifsese_s); | |
2abae5f1 SP |
730 | edge exit = create_empty_if_region_on_edge (entry, condition); |
731 | ||
732 | if_region->region = sese_region; | |
733 | if_region->region->entry = entry; | |
734 | if_region->region->exit = exit; | |
735 | ||
736 | FOR_EACH_EDGE (e, ei, entry->dest->succs) | |
737 | { | |
738 | if (e->flags & EDGE_TRUE_VALUE) | |
739 | { | |
740 | true_region->entry = e; | |
741 | true_region->exit = single_succ_edge (e->dest); | |
742 | if_region->true_region = true_region; | |
743 | } | |
744 | else if (e->flags & EDGE_FALSE_VALUE) | |
745 | { | |
746 | false_region->entry = e; | |
747 | false_region->exit = single_succ_edge (e->dest); | |
748 | if_region->false_region = false_region; | |
749 | } | |
750 | } | |
751 | ||
752 | return if_region; | |
753 | } | |
754 | ||
755 | /* Moves REGION in a condition expression: | |
756 | | if (1) | |
757 | | ; | |
758 | | else | |
759 | | REGION; | |
760 | */ | |
761 | ||
762 | ifsese | |
763 | move_sese_in_condition (sese region) | |
764 | { | |
765 | basic_block pred_block = split_edge (SESE_ENTRY (region)); | |
8c54631d | 766 | ifsese if_region; |
2abae5f1 SP |
767 | |
768 | SESE_ENTRY (region) = single_succ_edge (pred_block); | |
769 | if_region = create_if_region_on_edge (single_pred_edge (pred_block), integer_one_node); | |
770 | if_region_set_false_region (if_region, region); | |
771 | ||
772 | return if_region; | |
773 | } | |
774 | ||
3c7c0158 SP |
775 | /* Replaces the condition of the IF_REGION with CONDITION: |
776 | | if (CONDITION) | |
777 | | true_region; | |
778 | | else | |
779 | | false_region; | |
780 | */ | |
781 | ||
782 | void | |
783 | set_ifsese_condition (ifsese if_region, tree condition) | |
784 | { | |
785 | sese region = if_region->region; | |
786 | edge entry = region->entry; | |
787 | basic_block bb = entry->dest; | |
788 | gimple last = last_stmt (bb); | |
789 | gimple_stmt_iterator gsi = gsi_last_bb (bb); | |
790 | gimple cond_stmt; | |
791 | ||
792 | gcc_assert (gimple_code (last) == GIMPLE_COND); | |
793 | ||
794 | gsi_remove (&gsi, true); | |
795 | gsi = gsi_last_bb (bb); | |
796 | condition = force_gimple_operand_gsi (&gsi, condition, true, NULL, | |
797 | false, GSI_NEW_STMT); | |
798 | cond_stmt = gimple_build_cond_from_tree (condition, NULL_TREE, NULL_TREE); | |
799 | gsi = gsi_last_bb (bb); | |
800 | gsi_insert_after (&gsi, cond_stmt, GSI_NEW_STMT); | |
801 | } | |
802 | ||
2abae5f1 SP |
803 | /* Returns the scalar evolution of T in REGION. Every variable that |
804 | is not defined in the REGION is considered a parameter. */ | |
805 | ||
806 | tree | |
807 | scalar_evolution_in_region (sese region, loop_p loop, tree t) | |
808 | { | |
809 | gimple def; | |
810 | struct loop *def_loop; | |
811 | basic_block before = block_before_sese (region); | |
812 | ||
05575a46 SP |
813 | /* SCOP parameters. */ |
814 | if (TREE_CODE (t) == SSA_NAME | |
815 | && !defined_in_sese_p (t, region)) | |
816 | return t; | |
817 | ||
2abae5f1 SP |
818 | if (TREE_CODE (t) != SSA_NAME |
819 | || loop_in_sese_p (loop, region)) | |
820 | return instantiate_scev (before, loop, | |
821 | analyze_scalar_evolution (loop, t)); | |
822 | ||
2abae5f1 SP |
823 | def = SSA_NAME_DEF_STMT (t); |
824 | def_loop = loop_containing_stmt (def); | |
825 | ||
826 | if (loop_in_sese_p (def_loop, region)) | |
827 | { | |
828 | t = analyze_scalar_evolution (def_loop, t); | |
829 | def_loop = superloop_at_depth (def_loop, loop_depth (loop) + 1); | |
830 | t = compute_overall_effect_of_inner_loop (def_loop, t); | |
831 | return t; | |
832 | } | |
833 | else | |
834 | return instantiate_scev (before, loop, t); | |
835 | } |