Line data Source code
1 : /* Basic block path solver.
2 : Copyright (C) 2021-2026 Free Software Foundation, Inc.
3 : Contributed by Aldy Hernandez <aldyh@redhat.com>.
4 :
5 : This file is part of GCC.
6 :
7 : GCC is free software; you can redistribute it and/or modify it under
8 : the terms of the GNU General Public License as published by the Free
9 : Software Foundation; either version 3, or (at your option) any later
10 : version.
11 :
12 : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 : WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 : FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 : for more details.
16 :
17 : You should have received a copy of the GNU General Public License
18 : along with GCC; see the file COPYING3. If not see
19 : <http://www.gnu.org/licenses/>. */
20 :
21 : #include "config.h"
22 : #include "system.h"
23 : #include "coretypes.h"
24 : #include "backend.h"
25 : #include "tree.h"
26 : #include "gimple.h"
27 : #include "cfganal.h"
28 : #include "value-range.h"
29 : #include "gimple-range.h"
30 : #include "tree-pretty-print.h"
31 : #include "gimple-range-path.h"
32 : #include "ssa.h"
33 : #include "tree-cfg.h"
34 : #include "gimple-iterator.h"
35 :
36 : // Internal construct to help facilitate debugging of solver.
37 : #define DEBUG_SOLVER (dump_file && (param_threader_debug == THREADER_DEBUG_ALL))
38 :
39 25113490 : path_range_query::path_range_query (gimple_ranger &ranger,
40 : const vec<basic_block> &path,
41 : const bitmap_head *dependencies,
42 25113490 : bool resolve)
43 25113490 : : m_cache (),
44 25113490 : m_ranger (ranger),
45 25113490 : m_resolve (resolve)
46 : {
47 25113490 : share_query (ranger);
48 : // Override the relation oracle with a local path relation oracle.
49 25113490 : m_relation = new path_oracle (&(m_ranger.relation ()));
50 :
51 25113490 : reset_path (path, dependencies);
52 25113490 : }
53 :
54 2079882 : path_range_query::path_range_query (gimple_ranger &ranger, bool resolve)
55 2079882 : : m_cache (),
56 2079882 : m_ranger (ranger),
57 2079882 : m_resolve (resolve)
58 : {
59 2079882 : share_query (ranger);
60 : // Override the relation oracle with a local path relation oracle.
61 2079882 : m_relation = new path_oracle (&(m_ranger.relation ()));
62 2079882 : }
63 :
64 27975534 : path_range_query::~path_range_query ()
65 : {
66 27193372 : delete m_relation;
67 27193372 : m_relation = NULL;
68 27975534 : }
69 :
70 : // Return TRUE if NAME is an exit dependency for the path.
71 :
72 : bool
73 118011508 : path_range_query::exit_dependency_p (tree name)
74 : {
75 118011508 : return (TREE_CODE (name) == SSA_NAME
76 118011508 : && bitmap_bit_p (m_exit_dependencies, SSA_NAME_VERSION (name)));
77 : }
78 :
79 : // If NAME has a cache entry, return it in R, and return TRUE.
80 :
81 : inline bool
82 313074259 : path_range_query::get_cache (vrange &r, tree name)
83 : {
84 313074259 : if (!gimple_range_ssa_p (name))
85 55292374 : return get_global_range_query ()->range_of_expr (r, name);
86 :
87 257781885 : return m_cache.get_range (r, name);
88 : }
89 :
90 : void
91 0 : path_range_query::dump (FILE *dump_file)
92 : {
93 0 : push_dump_file save (dump_file, dump_flags & ~TDF_DETAILS);
94 :
95 0 : if (m_path.is_empty ())
96 0 : return;
97 :
98 0 : unsigned i;
99 0 : bitmap_iterator bi;
100 :
101 0 : dump_ranger (dump_file, m_path);
102 :
103 0 : fprintf (dump_file, "Exit dependencies:\n");
104 0 : EXECUTE_IF_SET_IN_BITMAP (m_exit_dependencies, 0, i, bi)
105 : {
106 0 : tree name = ssa_name (i);
107 0 : print_generic_expr (dump_file, name, TDF_SLIM);
108 0 : fprintf (dump_file, "\n");
109 : }
110 :
111 0 : m_cache.dump (dump_file);
112 0 : }
113 :
114 : void
115 0 : path_range_query::debug ()
116 : {
117 0 : dump (stderr);
118 0 : }
119 :
120 : // Return TRUE if NAME is defined outside the current path.
121 :
122 : bool
123 52672456 : path_range_query::defined_outside_path (tree name)
124 : {
125 52672456 : gimple *def = SSA_NAME_DEF_STMT (name);
126 52672456 : basic_block bb = gimple_bb (def);
127 :
128 52672456 : return !bb || !m_path.contains (bb);
129 : }
130 :
131 : // Return the range of NAME on entry to the path.
132 :
133 : void
134 19714997 : path_range_query::range_on_path_entry (vrange &r, tree name)
135 : {
136 19714997 : gcc_checking_assert (defined_outside_path (name));
137 19714997 : basic_block entry = entry_bb ();
138 19714997 : m_ranger.range_on_entry (r, entry, name);
139 19714997 : }
140 :
141 : // Return the range of NAME at the end of the path being analyzed.
142 :
143 : bool
144 177331393 : path_range_query::internal_range_of_expr (vrange &r, tree name, gimple *stmt)
145 : {
146 177331393 : if (!r.supports_type_p (TREE_TYPE (name)))
147 : return false;
148 :
149 177331393 : if (get_cache (r, name))
150 : return true;
151 :
152 53260740 : if (m_resolve && defined_outside_path (name))
153 : {
154 18398881 : range_on_path_entry (r, name);
155 18398881 : m_cache.set_range (name, r);
156 18398881 : return true;
157 : }
158 :
159 34861859 : if (stmt
160 34861859 : && range_defined_in_block (r, name, gimple_bb (stmt)))
161 : {
162 16975975 : if (TREE_CODE (name) == SSA_NAME)
163 : {
164 16975975 : value_range glob (TREE_TYPE (name));
165 16975975 : gimple_range_global (glob, name);
166 16975975 : r.intersect (glob);
167 16975975 : }
168 :
169 16975975 : m_cache.set_range (name, r);
170 16975975 : return true;
171 : }
172 :
173 17885884 : gimple_range_global (r, name);
174 17885884 : return true;
175 : }
176 :
177 : bool
178 177331393 : path_range_query::range_of_expr (vrange &r, tree name, gimple *stmt)
179 : {
180 177331393 : if (internal_range_of_expr (r, name, stmt))
181 : {
182 177331393 : if (r.undefined_p ())
183 137403 : m_undefined_path = true;
184 :
185 177331393 : return true;
186 : }
187 : return false;
188 : }
189 :
190 : bool
191 24216590 : path_range_query::unreachable_path_p ()
192 : {
193 24216590 : return m_undefined_path;
194 : }
195 :
196 : // Reset the current path to PATH.
197 :
198 : void
199 33531227 : path_range_query::reset_path (const vec<basic_block> &path,
200 : const bitmap_head *dependencies)
201 : {
202 33531227 : gcc_checking_assert (path.length () > 1);
203 33531227 : m_path = path.copy ();
204 33531227 : m_pos = m_path.length () - 1;
205 33531227 : m_undefined_path = false;
206 33531227 : m_cache.clear ();
207 :
208 33531227 : compute_ranges (dependencies);
209 33531227 : }
210 :
211 : bool
212 232298425 : path_range_query::ssa_defined_in_bb (tree name, basic_block bb)
213 : {
214 232298425 : return (TREE_CODE (name) == SSA_NAME
215 230049045 : && SSA_NAME_DEF_STMT (name)
216 462347470 : && gimple_bb (SSA_NAME_DEF_STMT (name)) == bb);
217 : }
218 :
219 : // Return the range of the result of PHI in R.
220 : //
221 : // Since PHIs are calculated in parallel at the beginning of the
222 : // block, we must be careful to never save anything to the cache here.
223 : // It is the caller's responsibility to adjust the cache. Also,
224 : // calculating the PHI's range must not trigger additional lookups.
225 :
226 : void
227 16413212 : path_range_query::ssa_range_in_phi (vrange &r, gphi *phi)
228 : {
229 16413212 : tree name = gimple_phi_result (phi);
230 :
231 32826424 : if (at_entry ())
232 : {
233 3077772 : if (m_resolve && m_ranger.range_of_expr (r, name, phi))
234 : return;
235 :
236 : // Try to fold the phi exclusively with global values.
237 : // This will get things like PHI <5(99), 6(88)>. We do this by
238 : // calling range_of_expr with no context.
239 1475967 : unsigned nargs = gimple_phi_num_args (phi);
240 1475967 : value_range arg_range (TREE_TYPE (name));
241 1475967 : r.set_undefined ();
242 4899497 : for (size_t i = 0; i < nargs; ++i)
243 : {
244 3423530 : tree arg = gimple_phi_arg_def (phi, i);
245 3423530 : if (m_ranger.range_of_expr (arg_range, arg, /*stmt=*/NULL))
246 3423530 : r.union_ (arg_range);
247 : else
248 : {
249 0 : r.set_varying (TREE_TYPE (name));
250 0 : return;
251 : }
252 : }
253 : return;
254 1475967 : }
255 :
256 13335440 : basic_block bb = gimple_bb (phi);
257 13335440 : basic_block prev = prev_bb ();
258 13335440 : edge e_in = find_edge (prev, bb);
259 13335440 : tree arg = PHI_ARG_DEF_FROM_EDGE (phi, e_in);
260 : // Avoid using the cache for ARGs defined in this block, as
261 : // that could create an ordering problem.
262 13335440 : if (ssa_defined_in_bb (arg, bb) || !get_cache (r, arg))
263 : {
264 3846695 : if (m_resolve)
265 : {
266 2286481 : value_range tmp (TREE_TYPE (name));
267 : // Using both the range on entry to the path, and the
268 : // range on this edge yields significantly better
269 : // results.
270 2286481 : if (TREE_CODE (arg) == SSA_NAME
271 2286481 : && defined_outside_path (arg))
272 1316116 : range_on_path_entry (r, arg);
273 : else
274 970365 : r.set_varying (TREE_TYPE (name));
275 2286481 : m_ranger.range_on_edge (tmp, e_in, arg);
276 2286481 : r.intersect (tmp);
277 2286481 : return;
278 2286481 : }
279 1560214 : r.set_varying (TREE_TYPE (name));
280 : }
281 : }
282 :
283 : // If NAME is defined in BB, set R to the range of NAME, and return
284 : // TRUE. Otherwise, return FALSE.
285 :
286 : bool
287 200392305 : path_range_query::range_defined_in_block (vrange &r, tree name, basic_block bb)
288 : {
289 200392305 : gimple *def_stmt = SSA_NAME_DEF_STMT (name);
290 200392305 : basic_block def_bb = gimple_bb (def_stmt);
291 :
292 200392305 : if (def_bb != bb)
293 : return false;
294 :
295 66699870 : if (get_cache (r, name))
296 : return true;
297 :
298 65128401 : if (gimple_code (def_stmt) == GIMPLE_PHI)
299 16413212 : ssa_range_in_phi (r, as_a<gphi *> (def_stmt));
300 : else
301 : {
302 48715189 : if (name)
303 48715189 : get_path_oracle ()->killing_def (name);
304 :
305 48715189 : if (!range_of_stmt (r, def_stmt, name))
306 14598 : r.set_varying (TREE_TYPE (name));
307 : }
308 :
309 65128401 : if (bb && POINTER_TYPE_P (TREE_TYPE (name)))
310 10307703 : infer_oracle ().maybe_adjust_range (r, name, bb);
311 :
312 65128401 : if (DEBUG_SOLVER && (bb || !r.varying_p ()))
313 : {
314 0 : fprintf (dump_file, "range_defined_in_block (BB%d) for ", bb ? bb->index : -1);
315 0 : print_generic_expr (dump_file, name, TDF_SLIM);
316 0 : fprintf (dump_file, " is ");
317 0 : r.dump (dump_file);
318 0 : fprintf (dump_file, "\n");
319 : }
320 :
321 : return true;
322 : }
323 :
324 : // Compute ranges defined in the PHIs in this block.
325 :
326 : void
327 91110756 : path_range_query::compute_ranges_in_phis (basic_block bb)
328 : {
329 : // PHIs must be resolved simultaneously on entry to the block
330 : // because any dependencies must be satisfied with values on entry.
331 : // Thus, we calculate all PHIs first, and then update the cache at
332 : // the end.
333 :
334 171054546 : for (auto iter = gsi_start_phis (bb); !gsi_end_p (iter); gsi_next (&iter))
335 : {
336 79943790 : gphi *phi = iter.phi ();
337 79943790 : tree name = gimple_phi_result (phi);
338 :
339 79943790 : if (!exit_dependency_p (name))
340 64756798 : continue;
341 :
342 15186992 : value_range r (TREE_TYPE (name));
343 15186992 : if (range_defined_in_block (r, name, bb))
344 15186992 : m_cache.set_range (name, r);
345 15186992 : }
346 91110756 : }
347 :
348 : // Return TRUE if relations may be invalidated after crossing edge E.
349 :
350 : bool
351 39896805 : path_range_query::relations_may_be_invalidated (edge e)
352 : {
353 : // As soon as the path crosses a back edge, we can encounter
354 : // definitions of SSA_NAMEs that may have had a use in the path
355 : // already, so this will then be a new definition. The relation
356 : // code is all designed around seeing things in dominator order, and
357 : // crossing a back edge in the path violates this assumption.
358 39896805 : return (e->flags & EDGE_DFS_BACK);
359 : }
360 :
361 : // Compute ranges defined in the current block, or exported to the
362 : // next block.
363 :
364 : void
365 91110756 : path_range_query::compute_ranges_in_block (basic_block bb)
366 : {
367 91110756 : bitmap_iterator bi;
368 91110756 : unsigned i;
369 :
370 145221671 : if (m_resolve && !at_entry ())
371 34005200 : compute_phi_relations (bb, prev_bb ());
372 :
373 : // Force recalculation of any names in the cache that are defined in
374 : // this block. This can happen on interdependent SSA/phis in loops.
375 306027442 : EXECUTE_IF_SET_IN_BITMAP (m_exit_dependencies, 0, i, bi)
376 : {
377 214916686 : tree name = ssa_name (i);
378 214916686 : if (ssa_defined_in_bb (name, bb))
379 49723895 : m_cache.clear_range (name);
380 : }
381 :
382 : // Solve dependencies defined in this block, starting with the PHIs...
383 91110756 : compute_ranges_in_phis (bb);
384 : // ...and then the rest of the dependencies.
385 306027442 : EXECUTE_IF_SET_IN_BITMAP (m_exit_dependencies, 0, i, bi)
386 : {
387 214916686 : tree name = ssa_name (i);
388 214916686 : value_range r (TREE_TYPE (name));
389 :
390 214916686 : if (gimple_code (SSA_NAME_DEF_STMT (name)) != GIMPLE_PHI
391 214916686 : && range_defined_in_block (r, name, bb))
392 34536903 : m_cache.set_range (name, r);
393 214916686 : }
394 :
395 91110756 : if (at_exit ())
396 33531227 : return;
397 :
398 : // Solve dependencies that are exported to the next block.
399 57579529 : basic_block next = next_bb ();
400 57579529 : edge e = find_edge (bb, next);
401 :
402 57579529 : if (m_resolve && relations_may_be_invalidated (e))
403 : {
404 2044433 : if (DEBUG_SOLVER)
405 0 : fprintf (dump_file,
406 : "Resetting relations as they may be invalidated in %d->%d.\n",
407 0 : e->src->index, e->dest->index);
408 :
409 2044433 : path_oracle *p = get_path_oracle ();
410 : // ?? Instead of nuking the root oracle altogether, we could
411 : // reset the path oracle to search for relations from the top of
412 : // the loop with the root oracle. Something for future development.
413 2044433 : p->reset_path ();
414 : }
415 :
416 57579529 : bitmap exports = gori_ssa ()->exports (bb);
417 72514541 : EXECUTE_IF_AND_IN_BITMAP (m_exit_dependencies, exports, 0, i, bi)
418 : {
419 14935012 : tree name = ssa_name (i);
420 14935012 : value_range r (TREE_TYPE (name));
421 14935012 : if (gori ().edge_range_p (r, e, name, *this))
422 : {
423 13324614 : value_range cached_range (TREE_TYPE (name));
424 13324614 : if (get_cache (cached_range, name))
425 10546830 : r.intersect (cached_range);
426 :
427 13324614 : m_cache.set_range (name, r);
428 13324614 : if (DEBUG_SOLVER)
429 : {
430 0 : fprintf (dump_file, "edge_range_p for ");
431 0 : print_generic_expr (dump_file, name, TDF_SLIM);
432 0 : fprintf (dump_file, " on edge %d->%d ",
433 0 : e->src->index, e->dest->index);
434 0 : fprintf (dump_file, "is ");
435 0 : r.dump (dump_file);
436 0 : fprintf (dump_file, "\n");
437 : }
438 13324614 : }
439 14935012 : }
440 :
441 57579529 : if (m_resolve)
442 34005200 : compute_outgoing_relations (bb, next);
443 : }
444 :
445 : // Adjust all pointer exit dependencies in BB with non-null information.
446 :
447 : void
448 91110756 : path_range_query::adjust_for_non_null_uses (basic_block bb)
449 : {
450 91110756 : prange r;
451 91110756 : bitmap_iterator bi;
452 91110756 : unsigned i;
453 :
454 306027442 : EXECUTE_IF_SET_IN_BITMAP (m_exit_dependencies, 0, i, bi)
455 : {
456 214916686 : tree name = ssa_name (i);
457 :
458 214916686 : if (!POINTER_TYPE_P (TREE_TYPE (name)))
459 171895988 : continue;
460 :
461 43020698 : if (get_cache (r, name))
462 : {
463 17379974 : if (r.nonzero_p ())
464 6680011 : continue;
465 : }
466 : else
467 25640724 : r.set_varying (TREE_TYPE (name));
468 :
469 36340687 : if (infer_oracle ().maybe_adjust_range (r, name, bb))
470 784654 : m_cache.set_range (name, r);
471 : }
472 91110756 : }
473 :
474 : // If NAME is a supported SSA_NAME, add it to the bitmap in dependencies.
475 :
476 : bool
477 160744 : path_range_query::add_to_exit_dependencies (tree name, bitmap dependencies)
478 : {
479 160744 : if (TREE_CODE (name) == SSA_NAME
480 160744 : && value_range::supports_type_p (TREE_TYPE (name)))
481 160744 : return bitmap_set_bit (dependencies, SSA_NAME_VERSION (name));
482 : return false;
483 : }
484 :
485 : // Compute the exit dependencies to PATH. These are essentially the
486 : // SSA names used to calculate the final conditional along the path.
487 :
488 : void
489 782162 : path_range_query::compute_exit_dependencies (bitmap dependencies)
490 : {
491 : // Start with the imports from the exit block...
492 782162 : basic_block exit = m_path[0];
493 782162 : bitmap_copy (dependencies, gori_ssa ()->imports (exit));
494 :
495 782162 : auto_vec<tree> worklist (bitmap_count_bits (dependencies));
496 782162 : bitmap_iterator bi;
497 782162 : unsigned i;
498 2008140 : EXECUTE_IF_SET_IN_BITMAP (dependencies, 0, i, bi)
499 : {
500 1225978 : tree name = ssa_name (i);
501 1225978 : worklist.quick_push (name);
502 : }
503 :
504 : // ...and add any operands used to define these imports.
505 4485700 : while (!worklist.is_empty ())
506 : {
507 1460688 : tree name = worklist.pop ();
508 1460688 : gimple *def_stmt = SSA_NAME_DEF_STMT (name);
509 1778542 : if (SSA_NAME_IS_DEFAULT_DEF (name)
510 1460688 : || !m_path.contains (gimple_bb (def_stmt)))
511 317854 : continue;
512 :
513 1142834 : if (gphi *phi = dyn_cast <gphi *> (def_stmt))
514 : {
515 1870804 : for (size_t i = 0; i < gimple_phi_num_args (phi); ++i)
516 : {
517 1249740 : edge e = gimple_phi_arg_edge (phi, i);
518 1249740 : tree arg = gimple_phi_arg (phi, i)->def;
519 :
520 1249740 : if (TREE_CODE (arg) == SSA_NAME
521 787663 : && m_path.contains (e->src)
522 1404182 : && bitmap_set_bit (dependencies, SSA_NAME_VERSION (arg)))
523 144073 : worklist.safe_push (arg);
524 : }
525 : }
526 2764620 : else if (gassign *ass = dyn_cast <gassign *> (def_stmt))
527 : {
528 476919 : tree ssa[3];
529 476919 : unsigned count = gimple_range_ssa_names (ssa, 3, ass);
530 637663 : for (unsigned j = 0; j < count; ++j)
531 160744 : if (add_to_exit_dependencies (ssa[j], dependencies))
532 90637 : worklist.safe_push (ssa[j]);
533 : }
534 : }
535 : // Exported booleans along the path, may help conditionals.
536 782162 : if (m_resolve)
537 2554989 : for (i = 0; i < m_path.length (); ++i)
538 : {
539 1772827 : basic_block bb = m_path[i];
540 1772827 : tree name;
541 3606226 : FOR_EACH_GORI_EXPORT_NAME (gori_ssa (), bb, name)
542 1833399 : if (TREE_CODE (TREE_TYPE (name)) == BOOLEAN_TYPE)
543 57227 : bitmap_set_bit (dependencies, SSA_NAME_VERSION (name));
544 : }
545 782162 : }
546 :
547 : // Compute the ranges for DEPENDENCIES along PATH.
548 : //
549 : // DEPENDENCIES are path exit dependencies. They are the set of SSA
550 : // names, any of which could potentially change the value of the final
551 : // conditional in PATH. If none is given, the exit dependencies are
552 : // calculated from the final conditional in the path.
553 :
554 : void
555 33531227 : path_range_query::compute_ranges (const bitmap_head *dependencies)
556 : {
557 33531227 : if (DEBUG_SOLVER)
558 0 : fprintf (dump_file, "\n==============================================\n");
559 :
560 33531227 : if (dependencies)
561 32749065 : bitmap_copy (m_exit_dependencies, dependencies);
562 : else
563 782162 : compute_exit_dependencies (m_exit_dependencies);
564 :
565 33531227 : if (m_resolve)
566 : {
567 20105715 : path_oracle *p = get_path_oracle ();
568 20105715 : p->reset_path (&(m_ranger.relation ()));
569 : }
570 :
571 33531227 : if (DEBUG_SOLVER)
572 : {
573 0 : fprintf (dump_file, "path_range_query: compute_ranges for path: ");
574 0 : for (unsigned i = m_path.length (); i > 0; --i)
575 : {
576 0 : basic_block bb = m_path[i - 1];
577 0 : fprintf (dump_file, "%d", bb->index);
578 0 : if (i > 1)
579 0 : fprintf (dump_file, "->");
580 : }
581 0 : fprintf (dump_file, "\n");
582 : }
583 :
584 57579529 : while (1)
585 : {
586 91110756 : basic_block bb = curr_bb ();
587 :
588 91110756 : compute_ranges_in_block (bb);
589 91110756 : adjust_for_non_null_uses (bb);
590 :
591 91110756 : if (at_exit ())
592 : break;
593 :
594 57579529 : move_next ();
595 : }
596 :
597 33531227 : if (DEBUG_SOLVER)
598 : {
599 0 : get_path_oracle ()->dump (dump_file);
600 0 : dump (dump_file);
601 : }
602 33531227 : }
603 :
604 : // A folding aid used to register and query relations along a path.
605 : // When queried, it returns relations as they would appear on exit to
606 : // the path.
607 : //
608 : // Relations are registered on entry so the path_oracle knows which
609 : // block to query the root oracle at when a relation lies outside the
610 : // path. However, when queried we return the relation on exit to the
611 : // path, since the root_oracle ignores the registered.
612 :
613 : class jt_fur_source : public fur_depend
614 : {
615 : public:
616 : jt_fur_source (gimple *s, path_range_query *, const vec<basic_block> &);
617 : relation_kind query_relation (tree op1, tree op2) override;
618 : bool register_relation (gimple *, relation_kind, tree op1, tree op2) override;
619 : bool register_relation (edge, relation_kind, tree op1, tree op2) override;
620 : private:
621 : basic_block m_entry;
622 : };
623 :
624 73016708 : jt_fur_source::jt_fur_source (gimple *s,
625 : path_range_query *query,
626 73016708 : const vec<basic_block> &path)
627 73016708 : : fur_depend (s, query)
628 : {
629 73016708 : gcc_checking_assert (!path.is_empty ());
630 :
631 73016708 : m_entry = path[path.length () - 1];
632 73016708 : }
633 :
634 : // Ignore statement and register relation on entry to path. Return false if
635 : // no new relation is registered.
636 :
637 : bool
638 9276607 : jt_fur_source::register_relation (gimple *, relation_kind k, tree op1, tree op2)
639 : {
640 9276607 : return m_query->relation ().record (m_entry, k, op1, op2);
641 : }
642 :
643 : // Ignore edge and register relation on entry to path. Return false if no
644 : // new relation is registered.
645 :
646 : bool
647 12350845 : jt_fur_source::register_relation (edge, relation_kind k, tree op1, tree op2)
648 : {
649 12350845 : return m_query->relation ().record (m_entry, k, op1, op2);
650 : }
651 :
652 : relation_kind
653 35087223 : jt_fur_source::query_relation (tree op1, tree op2)
654 : {
655 35087223 : if (TREE_CODE (op1) != SSA_NAME || TREE_CODE (op2) != SSA_NAME)
656 : return VREL_VARYING;
657 :
658 12092622 : return m_query->relation ().query (m_entry, op1, op2);
659 : }
660 :
661 : // Return the range of STMT at the end of the path being analyzed.
662 :
663 : bool
664 83409083 : path_range_query::range_of_stmt (vrange &r, gimple *stmt, tree)
665 : {
666 83409083 : tree type = gimple_range_type (stmt);
667 :
668 83409083 : if (!type || !r.supports_type_p (type))
669 14598 : return false;
670 :
671 : // If resolving unknowns, fold the statement making use of any
672 : // relations along the path.
673 83394485 : if (m_resolve)
674 : {
675 50955139 : fold_using_range f;
676 50955139 : jt_fur_source src (stmt, this, m_path);
677 50955139 : if (!f.fold_stmt (r, stmt, src))
678 5009 : r.set_varying (type);
679 : }
680 : // Otherwise, fold without relations.
681 32439346 : else if (!fold_range (r, stmt, this))
682 0 : r.set_varying (type);
683 :
684 : return true;
685 : }
686 :
687 : // If possible, register the relation on the incoming edge E into PHI.
688 :
689 : void
690 7239253 : path_range_query::maybe_register_phi_relation (gphi *phi, edge e)
691 : {
692 7239253 : tree arg = gimple_phi_arg_def (phi, e->dest_idx);
693 :
694 7239253 : if (!gimple_range_ssa_p (arg))
695 : return;
696 :
697 5891605 : if (relations_may_be_invalidated (e))
698 : return;
699 :
700 4046299 : basic_block bb = gimple_bb (phi);
701 4046299 : tree result = gimple_phi_result (phi);
702 :
703 : // Avoid recording the equivalence if the arg is defined in this
704 : // block, as that could create an ordering problem.
705 4046299 : if (ssa_defined_in_bb (arg, bb))
706 : return;
707 :
708 4046299 : if (dump_file && (dump_flags & TDF_DETAILS))
709 46 : fprintf (dump_file, "maybe_register_phi_relation in bb%d:", bb->index);
710 :
711 4046299 : get_path_oracle ()->killing_def (result);
712 4046299 : m_relation->record (entry_bb (), VREL_EQ, arg, result);
713 : }
714 :
715 : // Compute relations for each PHI in BB. For example:
716 : //
717 : // x_5 = PHI<y_9(5),...>
718 : //
719 : // If the path flows through BB5, we can register that x_5 == y_9.
720 :
721 : void
722 34005200 : path_range_query::compute_phi_relations (basic_block bb, basic_block prev)
723 : {
724 34005200 : if (prev == NULL)
725 : return;
726 :
727 34005200 : edge e_in = find_edge (prev, bb);
728 :
729 72072918 : for (gphi_iterator iter = gsi_start_phis (bb); !gsi_end_p (iter);
730 38067718 : gsi_next (&iter))
731 : {
732 38067718 : gphi *phi = iter.phi ();
733 38067718 : tree result = gimple_phi_result (phi);
734 38067718 : unsigned nargs = gimple_phi_num_args (phi);
735 :
736 38067718 : if (!exit_dependency_p (result))
737 30828465 : continue;
738 :
739 14244369 : for (size_t i = 0; i < nargs; ++i)
740 14244369 : if (e_in == gimple_phi_arg_edge (phi, i))
741 : {
742 7239253 : maybe_register_phi_relation (phi, e_in);
743 7239253 : break;
744 : }
745 : }
746 : }
747 :
748 : // Compute outgoing relations from BB to NEXT.
749 :
750 : void
751 34005200 : path_range_query::compute_outgoing_relations (basic_block bb, basic_block next)
752 : {
753 68010400 : if (gcond *cond = safe_dyn_cast <gcond *> (*gsi_last_bb (bb)))
754 : {
755 22061569 : int_range<2> r;
756 22061569 : edge e0 = EDGE_SUCC (bb, 0);
757 22061569 : edge e1 = EDGE_SUCC (bb, 1);
758 :
759 22061569 : if (e0->dest == next)
760 9291210 : gcond_edge_range (r, e0);
761 12770359 : else if (e1->dest == next)
762 12770359 : gcond_edge_range (r, e1);
763 : else
764 0 : gcc_unreachable ();
765 :
766 22061569 : jt_fur_source src (NULL, this, m_path);
767 22061569 : src.register_outgoing_edges (cond, r, e0, e1);
768 22061569 : }
769 34005200 : }
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