Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-optimize.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* Top-level control of tree optimizations. |
|
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2 Copyright 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009 |
| 0 | 3 Free Software Foundation, Inc. |
| 4 Contributed by Diego Novillo <dnovillo@redhat.com> | |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify | |
| 9 it under the terms of the GNU General Public License as published by | |
| 10 the Free Software Foundation; either version 3, or (at your option) | |
| 11 any later version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, | |
| 14 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 GNU General Public License for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 #include "config.h" | |
| 23 #include "system.h" | |
| 24 #include "coretypes.h" | |
| 25 #include "tm.h" | |
| 26 #include "tree.h" | |
| 27 #include "rtl.h" | |
| 28 #include "tm_p.h" | |
| 29 #include "hard-reg-set.h" | |
| 30 #include "basic-block.h" | |
| 31 #include "output.h" | |
| 32 #include "expr.h" | |
| 33 #include "diagnostic.h" | |
| 34 #include "basic-block.h" | |
| 35 #include "flags.h" | |
| 36 #include "tree-flow.h" | |
| 37 #include "tree-dump.h" | |
| 38 #include "timevar.h" | |
| 39 #include "function.h" | |
| 40 #include "langhooks.h" | |
| 41 #include "toplev.h" | |
| 42 #include "flags.h" | |
| 43 #include "cgraph.h" | |
| 44 #include "tree-inline.h" | |
| 45 #include "tree-mudflap.h" | |
| 46 #include "tree-pass.h" | |
| 47 #include "ggc.h" | |
| 48 #include "cgraph.h" | |
| 49 #include "graph.h" | |
| 50 #include "cfgloop.h" | |
| 51 #include "except.h" | |
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52 #include "plugin.h" |
| 0 | 53 |
| 54 | |
| 55 /* Gate: execute, or not, all of the non-trivial optimizations. */ | |
| 56 | |
| 57 static bool | |
| 58 gate_all_optimizations (void) | |
| 59 { | |
| 60 return (optimize >= 1 | |
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61 /* Don't bother doing anything if the program has errors. |
| 0 | 62 We have to pass down the queue if we already went into SSA */ |
| 63 && (!(errorcount || sorrycount) || gimple_in_ssa_p (cfun))); | |
| 64 } | |
| 65 | |
| 66 struct gimple_opt_pass pass_all_optimizations = | |
| 67 { | |
| 68 { | |
| 69 GIMPLE_PASS, | |
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70 "*all_optimizations", /* name */ |
| 0 | 71 gate_all_optimizations, /* gate */ |
| 72 NULL, /* execute */ | |
| 73 NULL, /* sub */ | |
| 74 NULL, /* next */ | |
| 75 0, /* static_pass_number */ | |
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76 TV_NONE, /* tv_id */ |
| 0 | 77 0, /* properties_required */ |
| 78 0, /* properties_provided */ | |
| 79 0, /* properties_destroyed */ | |
| 80 0, /* todo_flags_start */ | |
| 81 0 /* todo_flags_finish */ | |
| 82 } | |
| 83 }; | |
| 84 | |
| 85 /* Gate: execute, or not, all of the non-trivial optimizations. */ | |
| 86 | |
| 87 static bool | |
| 88 gate_all_early_local_passes (void) | |
| 89 { | |
| 90 /* Don't bother doing anything if the program has errors. */ | |
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91 return (!errorcount && !sorrycount && !in_lto_p); |
| 0 | 92 } |
| 93 | |
| 94 struct simple_ipa_opt_pass pass_early_local_passes = | |
| 95 { | |
| 96 { | |
| 97 SIMPLE_IPA_PASS, | |
| 98 "early_local_cleanups", /* name */ | |
| 99 gate_all_early_local_passes, /* gate */ | |
| 100 NULL, /* execute */ | |
| 101 NULL, /* sub */ | |
| 102 NULL, /* next */ | |
| 103 0, /* static_pass_number */ | |
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104 TV_NONE, /* tv_id */ |
| 0 | 105 0, /* properties_required */ |
| 106 0, /* properties_provided */ | |
| 107 0, /* properties_destroyed */ | |
| 108 0, /* todo_flags_start */ | |
| 109 TODO_remove_functions /* todo_flags_finish */ | |
| 110 } | |
| 111 }; | |
| 112 | |
| 113 static unsigned int | |
| 114 execute_early_local_optimizations (void) | |
| 115 { | |
| 116 /* First time we start with early optimization we need to advance | |
| 117 cgraph state so newly inserted functions are also early optimized. | |
| 118 However we execute early local optimizations for lately inserted | |
| 119 functions, in that case don't reset cgraph state back to IPA_SSA. */ | |
| 120 if (cgraph_state < CGRAPH_STATE_IPA_SSA) | |
| 121 cgraph_state = CGRAPH_STATE_IPA_SSA; | |
| 122 return 0; | |
| 123 } | |
| 124 | |
| 125 /* Gate: execute, or not, all of the non-trivial optimizations. */ | |
| 126 | |
| 127 static bool | |
| 128 gate_all_early_optimizations (void) | |
| 129 { | |
| 130 return (optimize >= 1 | |
| 131 /* Don't bother doing anything if the program has errors. */ | |
| 132 && !(errorcount || sorrycount)); | |
| 133 } | |
| 134 | |
| 135 struct gimple_opt_pass pass_all_early_optimizations = | |
| 136 { | |
| 137 { | |
| 138 GIMPLE_PASS, | |
| 139 "early_optimizations", /* name */ | |
| 140 gate_all_early_optimizations, /* gate */ | |
| 141 execute_early_local_optimizations, /* execute */ | |
| 142 NULL, /* sub */ | |
| 143 NULL, /* next */ | |
| 144 0, /* static_pass_number */ | |
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145 TV_NONE, /* tv_id */ |
| 0 | 146 0, /* properties_required */ |
| 147 0, /* properties_provided */ | |
| 148 0, /* properties_destroyed */ | |
| 149 0, /* todo_flags_start */ | |
| 150 0 /* todo_flags_finish */ | |
| 151 } | |
| 152 }; | |
| 153 | |
| 154 /* Pass: cleanup the CFG just before expanding trees to RTL. | |
| 155 This is just a round of label cleanups and case node grouping | |
| 156 because after the tree optimizers have run such cleanups may | |
| 157 be necessary. */ | |
| 158 | |
| 159 static unsigned int | |
| 160 execute_cleanup_cfg_pre_ipa (void) | |
| 161 { | |
| 162 cleanup_tree_cfg (); | |
| 163 return 0; | |
| 164 } | |
| 165 | |
| 166 struct gimple_opt_pass pass_cleanup_cfg = | |
| 167 { | |
| 168 { | |
| 169 GIMPLE_PASS, | |
| 170 "cleanup_cfg", /* name */ | |
| 171 NULL, /* gate */ | |
| 172 execute_cleanup_cfg_pre_ipa, /* execute */ | |
| 173 NULL, /* sub */ | |
| 174 NULL, /* next */ | |
| 175 0, /* static_pass_number */ | |
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176 TV_NONE, /* tv_id */ |
| 0 | 177 PROP_cfg, /* properties_required */ |
| 178 0, /* properties_provided */ | |
| 179 0, /* properties_destroyed */ | |
| 180 0, /* todo_flags_start */ | |
| 181 TODO_dump_func /* todo_flags_finish */ | |
| 182 } | |
| 183 }; | |
| 184 | |
| 185 | |
| 186 /* Pass: cleanup the CFG just before expanding trees to RTL. | |
| 187 This is just a round of label cleanups and case node grouping | |
| 188 because after the tree optimizers have run such cleanups may | |
| 189 be necessary. */ | |
| 190 | |
| 191 static unsigned int | |
| 192 execute_cleanup_cfg_post_optimizing (void) | |
| 193 { | |
| 194 fold_cond_expr_cond (); | |
| 195 cleanup_tree_cfg (); | |
| 196 cleanup_dead_labels (); | |
| 197 group_case_labels (); | |
| 198 return 0; | |
| 199 } | |
| 200 | |
| 201 struct gimple_opt_pass pass_cleanup_cfg_post_optimizing = | |
| 202 { | |
| 203 { | |
| 204 GIMPLE_PASS, | |
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205 "optimized", /* name */ |
| 0 | 206 NULL, /* gate */ |
| 207 execute_cleanup_cfg_post_optimizing, /* execute */ | |
| 208 NULL, /* sub */ | |
| 209 NULL, /* next */ | |
| 210 0, /* static_pass_number */ | |
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211 TV_NONE, /* tv_id */ |
| 0 | 212 PROP_cfg, /* properties_required */ |
| 213 0, /* properties_provided */ | |
| 214 0, /* properties_destroyed */ | |
| 215 0, /* todo_flags_start */ | |
| 216 TODO_dump_func /* todo_flags_finish */ | |
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217 | TODO_remove_unused_locals |
| 0 | 218 } |
| 219 }; | |
| 220 | |
| 221 /* Pass: do the actions required to finish with tree-ssa optimization | |
| 222 passes. */ | |
| 223 | |
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224 unsigned int |
| 0 | 225 execute_free_datastructures (void) |
| 226 { | |
| 227 free_dominance_info (CDI_DOMINATORS); | |
| 228 free_dominance_info (CDI_POST_DOMINATORS); | |
| 229 | |
| 230 /* And get rid of annotations we no longer need. */ | |
| 231 delete_tree_cfg_annotations (); | |
| 232 | |
| 233 return 0; | |
| 234 } | |
| 235 | |
| 236 /* Pass: fixup_cfg. IPA passes, compilation of earlier functions or inlining | |
| 237 might have changed some properties, such as marked functions nothrow. | |
| 238 Remove redundant edges and basic blocks, and create new ones if necessary. | |
| 239 | |
| 240 This pass can't be executed as stand alone pass from pass manager, because | |
| 241 in between inlining and this fixup the verify_flow_info would fail. */ | |
| 242 | |
| 243 unsigned int | |
| 244 execute_fixup_cfg (void) | |
| 245 { | |
| 246 basic_block bb; | |
| 247 gimple_stmt_iterator gsi; | |
| 248 int todo = gimple_in_ssa_p (cfun) ? TODO_verify_ssa : 0; | |
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249 gcov_type count_scale; |
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250 edge e; |
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251 edge_iterator ei; |
| 0 | 252 |
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253 if (ENTRY_BLOCK_PTR->count) |
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254 count_scale = (cgraph_node (current_function_decl)->count * REG_BR_PROB_BASE |
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255 + ENTRY_BLOCK_PTR->count / 2) / ENTRY_BLOCK_PTR->count; |
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256 else |
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257 count_scale = REG_BR_PROB_BASE; |
| 0 | 258 |
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259 ENTRY_BLOCK_PTR->count = cgraph_node (current_function_decl)->count; |
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260 EXIT_BLOCK_PTR->count = (EXIT_BLOCK_PTR->count * count_scale |
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261 + REG_BR_PROB_BASE / 2) / REG_BR_PROB_BASE; |
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262 |
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263 FOR_EACH_BB (bb) |
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264 { |
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265 bb->count = (bb->count * count_scale |
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266 + REG_BR_PROB_BASE / 2) / REG_BR_PROB_BASE; |
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267 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
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268 { |
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269 gimple stmt = gsi_stmt (gsi); |
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270 tree decl = is_gimple_call (stmt) |
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271 ? gimple_call_fndecl (stmt) |
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272 : NULL; |
| 0 | 273 |
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274 if (decl |
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275 && gimple_call_flags (stmt) & (ECF_CONST |
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276 | ECF_PURE |
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277 | ECF_LOOPING_CONST_OR_PURE)) |
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278 { |
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279 if (gimple_in_ssa_p (cfun)) |
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280 { |
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281 todo |= TODO_update_ssa | TODO_cleanup_cfg; |
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282 mark_symbols_for_renaming (stmt); |
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283 update_stmt (stmt); |
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284 } |
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285 } |
| 0 | 286 |
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287 maybe_clean_eh_stmt (stmt); |
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288 } |
| 0 | 289 |
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290 if (gimple_purge_dead_eh_edges (bb)) |
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291 todo |= TODO_cleanup_cfg; |
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292 FOR_EACH_EDGE (e, ei, bb->succs) |
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293 e->count = (e->count * count_scale |
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294 + REG_BR_PROB_BASE / 2) / REG_BR_PROB_BASE; |
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295 } |
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296 if (count_scale != REG_BR_PROB_BASE) |
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297 compute_function_frequency (); |
| 0 | 298 |
| 299 /* Dump a textual representation of the flowgraph. */ | |
| 300 if (dump_file) | |
| 301 gimple_dump_cfg (dump_file, dump_flags); | |
| 302 | |
| 303 return todo; | |
| 304 } | |
| 305 | |
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306 struct gimple_opt_pass pass_fixup_cfg = |
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307 { |
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308 { |
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309 GIMPLE_PASS, |
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310 "*free_cfg_annotations", /* name */ |
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311 NULL, /* gate */ |
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312 execute_fixup_cfg, /* execute */ |
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313 NULL, /* sub */ |
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314 NULL, /* next */ |
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315 0, /* static_pass_number */ |
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316 TV_NONE, /* tv_id */ |
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317 PROP_cfg, /* properties_required */ |
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318 0, /* properties_provided */ |
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319 0, /* properties_destroyed */ |
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320 0, /* todo_flags_start */ |
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321 0 /* todo_flags_finish */ |
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322 } |
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323 }; |
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324 |
| 0 | 325 /* Do the actions required to initialize internal data structures used |
| 326 in tree-ssa optimization passes. */ | |
| 327 | |
| 328 static unsigned int | |
| 329 execute_init_datastructures (void) | |
| 330 { | |
| 331 /* Allocate hash tables, arrays and other structures. */ | |
| 332 init_tree_ssa (cfun); | |
| 333 return 0; | |
| 334 } | |
| 335 | |
| 336 struct gimple_opt_pass pass_init_datastructures = | |
| 337 { | |
| 338 { | |
| 339 GIMPLE_PASS, | |
|
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340 "*init_datastructures", /* name */ |
| 0 | 341 NULL, /* gate */ |
| 342 execute_init_datastructures, /* execute */ | |
| 343 NULL, /* sub */ | |
| 344 NULL, /* next */ | |
| 345 0, /* static_pass_number */ | |
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346 TV_NONE, /* tv_id */ |
| 0 | 347 PROP_cfg, /* properties_required */ |
| 348 0, /* properties_provided */ | |
| 349 0, /* properties_destroyed */ | |
| 350 0, /* todo_flags_start */ | |
| 351 0 /* todo_flags_finish */ | |
| 352 } | |
| 353 }; | |
| 354 | |
| 355 void | |
| 356 tree_lowering_passes (tree fn) | |
| 357 { | |
| 358 tree saved_current_function_decl = current_function_decl; | |
| 359 | |
| 360 current_function_decl = fn; | |
| 361 push_cfun (DECL_STRUCT_FUNCTION (fn)); | |
| 362 gimple_register_cfg_hooks (); | |
| 363 bitmap_obstack_initialize (NULL); | |
| 364 execute_pass_list (all_lowering_passes); | |
| 365 if (optimize && cgraph_global_info_ready) | |
| 366 execute_pass_list (pass_early_local_passes.pass.sub); | |
| 367 free_dominance_info (CDI_POST_DOMINATORS); | |
| 368 free_dominance_info (CDI_DOMINATORS); | |
| 369 compact_blocks (); | |
| 370 current_function_decl = saved_current_function_decl; | |
| 371 bitmap_obstack_release (NULL); | |
| 372 pop_cfun (); | |
| 373 } | |
| 374 | |
| 375 /* For functions-as-trees languages, this performs all optimization and | |
| 376 compilation for FNDECL. */ | |
| 377 | |
| 378 void | |
| 379 tree_rest_of_compilation (tree fndecl) | |
| 380 { | |
| 381 location_t saved_loc; | |
| 382 | |
| 383 timevar_push (TV_EXPAND); | |
| 384 | |
| 385 gcc_assert (cgraph_global_info_ready); | |
| 386 | |
| 387 /* Initialize the default bitmap obstack. */ | |
| 388 bitmap_obstack_initialize (NULL); | |
| 389 | |
| 390 /* Initialize the RTL code for the function. */ | |
| 391 current_function_decl = fndecl; | |
| 392 saved_loc = input_location; | |
| 393 input_location = DECL_SOURCE_LOCATION (fndecl); | |
| 394 init_function_start (fndecl); | |
| 395 | |
| 396 /* Even though we're inside a function body, we still don't want to | |
| 397 call expand_expr to calculate the size of a variable-sized array. | |
| 398 We haven't necessarily assigned RTL to all variables yet, so it's | |
| 399 not safe to try to expand expressions involving them. */ | |
| 400 cfun->dont_save_pending_sizes_p = 1; | |
|
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401 |
| 0 | 402 gimple_register_cfg_hooks (); |
| 403 | |
| 404 bitmap_obstack_initialize (®_obstack); /* FIXME, only at RTL generation*/ | |
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405 |
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406 execute_all_ipa_transforms (); |
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407 |
| 0 | 408 /* Perform all tree transforms and optimizations. */ |
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409 |
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410 /* Signal the start of passes. */ |
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411 invoke_plugin_callbacks (PLUGIN_ALL_PASSES_START, NULL); |
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412 |
| 0 | 413 execute_pass_list (all_passes); |
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414 |
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415 /* Signal the end of passes. */ |
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416 invoke_plugin_callbacks (PLUGIN_ALL_PASSES_END, NULL); |
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417 |
| 0 | 418 bitmap_obstack_release (®_obstack); |
| 419 | |
| 420 /* Release the default bitmap obstack. */ | |
| 421 bitmap_obstack_release (NULL); | |
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422 |
| 0 | 423 set_cfun (NULL); |
| 424 | |
| 425 /* If requested, warn about function definitions where the function will | |
| 426 return a value (usually of some struct or union type) which itself will | |
| 427 take up a lot of stack space. */ | |
| 428 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl)) | |
| 429 { | |
| 430 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl)); | |
| 431 | |
| 432 if (ret_type && TYPE_SIZE_UNIT (ret_type) | |
| 433 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST | |
| 434 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type), | |
| 435 larger_than_size)) | |
| 436 { | |
| 437 unsigned int size_as_int | |
| 438 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type)); | |
| 439 | |
| 440 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0) | |
| 441 warning (OPT_Wlarger_than_eq, "size of return value of %q+D is %u bytes", | |
| 442 fndecl, size_as_int); | |
| 443 else | |
| 444 warning (OPT_Wlarger_than_eq, "size of return value of %q+D is larger than %wd bytes", | |
| 445 fndecl, larger_than_size); | |
| 446 } | |
| 447 } | |
| 448 | |
| 449 gimple_set_body (fndecl, NULL); | |
| 450 if (DECL_STRUCT_FUNCTION (fndecl) == 0 | |
| 451 && !cgraph_node (fndecl)->origin) | |
| 452 { | |
| 453 /* Stop pointing to the local nodes about to be freed. | |
| 454 But DECL_INITIAL must remain nonzero so we know this | |
| 455 was an actual function definition. | |
| 456 For a nested function, this is done in c_pop_function_context. | |
| 457 If rest_of_compilation set this to 0, leave it 0. */ | |
| 458 if (DECL_INITIAL (fndecl) != 0) | |
| 459 DECL_INITIAL (fndecl) = error_mark_node; | |
| 460 } | |
| 461 | |
| 462 input_location = saved_loc; | |
| 463 | |
| 464 ggc_collect (); | |
| 465 timevar_pop (TV_EXPAND); | |
| 466 } |