1 /* Loop optimizations over tree-ssa.
2 Copyright (C) 2003, 2005 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 GCC is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING. If not, write to the Free
18 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
23 #include "coretypes.h"
28 #include "hard-reg-set.h"
29 #include "basic-block.h"
31 #include "diagnostic.h"
32 #include "tree-flow.h"
33 #include "tree-dump.h"
34 #include "tree-pass.h"
38 #include "tree-inline.h"
39 #include "tree-scalar-evolution.h"
41 /* The loop tree currently optimized. */
43 struct loops *current_loops = NULL;
45 /* Initializes the loop structures. */
48 tree_loop_optimizer_init (void)
52 loops = loop_optimizer_init (LOOPS_NORMAL
53 | LOOPS_HAVE_MARKED_SINGLE_EXITS);
58 rewrite_into_loop_closed_ssa (NULL, TODO_update_ssa);
63 /* The loop superpass. */
68 return flag_tree_loop_optimize != 0;
71 struct tree_opt_pass pass_tree_loop =
74 gate_tree_loop, /* gate */
78 0, /* static_pass_number */
79 TV_TREE_LOOP, /* tv_id */
80 PROP_cfg, /* properties_required */
81 0, /* properties_provided */
82 0, /* properties_destroyed */
83 TODO_ggc_collect, /* todo_flags_start */
84 TODO_dump_func | TODO_verify_ssa | TODO_ggc_collect, /* todo_flags_finish */
88 /* Loop optimizer initialization. */
91 tree_ssa_loop_init (void)
93 current_loops = tree_loop_optimizer_init ();
97 scev_initialize (current_loops);
101 struct tree_opt_pass pass_tree_loop_init =
103 "loopinit", /* name */
105 tree_ssa_loop_init, /* execute */
108 0, /* static_pass_number */
109 TV_TREE_LOOP_INIT, /* tv_id */
110 PROP_cfg, /* properties_required */
111 0, /* properties_provided */
112 0, /* properties_destroyed */
113 0, /* todo_flags_start */
114 TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
118 /* Loop invariant motion pass. */
121 tree_ssa_loop_im (void)
126 tree_ssa_lim (current_loops);
131 gate_tree_ssa_loop_im (void)
133 return flag_tree_loop_im != 0;
136 struct tree_opt_pass pass_lim =
139 gate_tree_ssa_loop_im, /* gate */
140 tree_ssa_loop_im, /* execute */
143 0, /* static_pass_number */
145 PROP_cfg, /* properties_required */
146 0, /* properties_provided */
147 0, /* properties_destroyed */
148 0, /* todo_flags_start */
149 TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
153 /* Loop unswitching pass. */
156 tree_ssa_loop_unswitch (void)
161 return tree_ssa_unswitch_loops (current_loops);
165 gate_tree_ssa_loop_unswitch (void)
167 return flag_unswitch_loops != 0;
170 struct tree_opt_pass pass_tree_unswitch =
172 "unswitch", /* name */
173 gate_tree_ssa_loop_unswitch, /* gate */
174 tree_ssa_loop_unswitch, /* execute */
177 0, /* static_pass_number */
178 TV_TREE_LOOP_UNSWITCH, /* tv_id */
179 PROP_cfg, /* properties_required */
180 0, /* properties_provided */
181 0, /* properties_destroyed */
182 0, /* todo_flags_start */
183 TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
187 /* Loop autovectorization. */
190 tree_vectorize (void)
192 vectorize_loops (current_loops);
197 gate_tree_vectorize (void)
199 return flag_tree_vectorize && current_loops;
202 struct tree_opt_pass pass_vectorize =
205 gate_tree_vectorize, /* gate */
206 tree_vectorize, /* execute */
209 0, /* static_pass_number */
210 TV_TREE_VECTORIZATION, /* tv_id */
211 PROP_cfg | PROP_ssa, /* properties_required */
212 0, /* properties_provided */
213 0, /* properties_destroyed */
214 TODO_verify_loops, /* todo_flags_start */
215 TODO_dump_func | TODO_update_ssa, /* todo_flags_finish */
219 /* Loop nest optimizations. */
222 tree_linear_transform (void)
227 linear_transform_loops (current_loops);
232 gate_tree_linear_transform (void)
234 return flag_tree_loop_linear != 0;
237 struct tree_opt_pass pass_linear_transform =
240 gate_tree_linear_transform, /* gate */
241 tree_linear_transform, /* execute */
244 0, /* static_pass_number */
245 TV_TREE_LINEAR_TRANSFORM, /* tv_id */
246 PROP_cfg | PROP_ssa, /* properties_required */
247 0, /* properties_provided */
248 0, /* properties_destroyed */
249 0, /* todo_flags_start */
250 TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
254 /* Canonical induction variable creation pass. */
257 tree_ssa_loop_ivcanon (void)
262 return canonicalize_induction_variables (current_loops);
266 gate_tree_ssa_loop_ivcanon (void)
268 return flag_tree_loop_ivcanon != 0;
271 struct tree_opt_pass pass_iv_canon =
273 "ivcanon", /* name */
274 gate_tree_ssa_loop_ivcanon, /* gate */
275 tree_ssa_loop_ivcanon, /* execute */
278 0, /* static_pass_number */
279 TV_TREE_LOOP_IVCANON, /* tv_id */
280 PROP_cfg | PROP_ssa, /* properties_required */
281 0, /* properties_provided */
282 0, /* properties_destroyed */
283 0, /* todo_flags_start */
284 TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
288 /* Propagation of constants using scev. */
291 gate_scev_const_prop (void)
296 struct tree_opt_pass pass_scev_cprop =
299 gate_scev_const_prop, /* gate */
300 scev_const_prop, /* execute */
303 0, /* static_pass_number */
304 TV_SCEV_CONST, /* tv_id */
305 PROP_cfg | PROP_ssa, /* properties_required */
306 0, /* properties_provided */
307 0, /* properties_destroyed */
308 0, /* todo_flags_start */
309 TODO_dump_func | TODO_cleanup_cfg
310 | TODO_update_ssa_only_virtuals,
311 /* todo_flags_finish */
315 /* Remove empty loops. */
318 tree_ssa_empty_loop (void)
323 return remove_empty_loops (current_loops);
326 struct tree_opt_pass pass_empty_loop =
330 tree_ssa_empty_loop, /* execute */
333 0, /* static_pass_number */
334 TV_COMPLETE_UNROLL, /* tv_id */
335 PROP_cfg | PROP_ssa, /* properties_required */
336 0, /* properties_provided */
337 0, /* properties_destroyed */
338 0, /* todo_flags_start */
339 TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
343 /* Record bounds on numbers of iterations of loops. */
346 tree_ssa_loop_bounds (void)
351 estimate_numbers_of_iterations (current_loops);
356 struct tree_opt_pass pass_record_bounds =
360 tree_ssa_loop_bounds, /* execute */
363 0, /* static_pass_number */
364 TV_TREE_LOOP_BOUNDS, /* tv_id */
365 PROP_cfg | PROP_ssa, /* properties_required */
366 0, /* properties_provided */
367 0, /* properties_destroyed */
368 0, /* todo_flags_start */
369 0, /* todo_flags_finish */
373 /* Complete unrolling of loops. */
376 tree_complete_unroll (void)
381 return tree_unroll_loops_completely (current_loops,
388 gate_tree_complete_unroll (void)
393 struct tree_opt_pass pass_complete_unroll =
395 "cunroll", /* name */
396 gate_tree_complete_unroll, /* gate */
397 tree_complete_unroll, /* execute */
400 0, /* static_pass_number */
401 TV_COMPLETE_UNROLL, /* tv_id */
402 PROP_cfg | PROP_ssa, /* properties_required */
403 0, /* properties_provided */
404 0, /* properties_destroyed */
405 0, /* todo_flags_start */
406 TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
413 tree_ssa_loop_prefetch (void)
418 return tree_ssa_prefetch_arrays (current_loops);
422 gate_tree_ssa_loop_prefetch (void)
424 return flag_prefetch_loop_arrays != 0;
427 struct tree_opt_pass pass_loop_prefetch =
429 "prefetch", /* name */
430 gate_tree_ssa_loop_prefetch, /* gate */
431 tree_ssa_loop_prefetch, /* execute */
434 0, /* static_pass_number */
435 TV_TREE_PREFETCH, /* tv_id */
436 PROP_cfg | PROP_ssa, /* properties_required */
437 0, /* properties_provided */
438 0, /* properties_destroyed */
439 0, /* todo_flags_start */
440 TODO_dump_func | TODO_verify_loops, /* todo_flags_finish */
444 /* Induction variable optimizations. */
447 tree_ssa_loop_ivopts (void)
452 tree_ssa_iv_optimize (current_loops);
457 gate_tree_ssa_loop_ivopts (void)
459 return flag_ivopts != 0;
462 struct tree_opt_pass pass_iv_optimize =
465 gate_tree_ssa_loop_ivopts, /* gate */
466 tree_ssa_loop_ivopts, /* execute */
469 0, /* static_pass_number */
470 TV_TREE_LOOP_IVOPTS, /* tv_id */
471 PROP_cfg | PROP_ssa, /* properties_required */
472 0, /* properties_provided */
473 0, /* properties_destroyed */
474 0, /* todo_flags_start */
477 | TODO_update_ssa, /* todo_flags_finish */
481 /* Loop optimizer finalization. */
484 tree_ssa_loop_done (void)
489 free_numbers_of_iterations_estimates (current_loops);
491 loop_optimizer_finalize (current_loops);
492 current_loops = NULL;
496 struct tree_opt_pass pass_tree_loop_done =
498 "loopdone", /* name */
500 tree_ssa_loop_done, /* execute */
503 0, /* static_pass_number */
504 TV_TREE_LOOP_FINI, /* tv_id */
505 PROP_cfg, /* properties_required */
506 0, /* properties_provided */
507 0, /* properties_destroyed */
508 0, /* todo_flags_start */
509 TODO_cleanup_cfg | TODO_dump_func, /* todo_flags_finish */