Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-dce.c @ 108:7ad14f446135
add CbC-example/rectypeTest/
| author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Thu, 14 Jun 2012 20:30:24 +0900 |
| parents | f6334be47118 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Dead code elimination pass for the GNU compiler. |
|
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2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| 0 | 3 Free Software Foundation, Inc. |
| 4 Contributed by Ben Elliston <bje@redhat.com> | |
| 5 and Andrew MacLeod <amacleod@redhat.com> | |
| 6 Adapted to use control dependence by Steven Bosscher, SUSE Labs. | |
|
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7 |
| 0 | 8 This file is part of GCC. |
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9 |
| 0 | 10 GCC is free software; you can redistribute it and/or modify it |
| 11 under the terms of the GNU General Public License as published by the | |
| 12 Free Software Foundation; either version 3, or (at your option) any | |
| 13 later version. | |
|
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14 |
| 0 | 15 GCC is distributed in the hope that it will be useful, but WITHOUT |
| 16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 18 for more details. | |
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19 |
| 0 | 20 You should have received a copy of the GNU General Public License |
| 21 along with GCC; see the file COPYING3. If not see | |
| 22 <http://www.gnu.org/licenses/>. */ | |
| 23 | |
| 24 /* Dead code elimination. | |
| 25 | |
| 26 References: | |
| 27 | |
| 28 Building an Optimizing Compiler, | |
| 29 Robert Morgan, Butterworth-Heinemann, 1998, Section 8.9. | |
| 30 | |
| 31 Advanced Compiler Design and Implementation, | |
| 32 Steven Muchnick, Morgan Kaufmann, 1997, Section 18.10. | |
| 33 | |
| 34 Dead-code elimination is the removal of statements which have no | |
| 35 impact on the program's output. "Dead statements" have no impact | |
| 36 on the program's output, while "necessary statements" may have | |
| 37 impact on the output. | |
| 38 | |
| 39 The algorithm consists of three phases: | |
| 40 1. Marking as necessary all statements known to be necessary, | |
| 41 e.g. most function calls, writing a value to memory, etc; | |
| 42 2. Propagating necessary statements, e.g., the statements | |
| 43 giving values to operands in necessary statements; and | |
| 44 3. Removing dead statements. */ | |
| 45 | |
| 46 #include "config.h" | |
| 47 #include "system.h" | |
| 48 #include "coretypes.h" | |
| 49 #include "tm.h" | |
| 50 | |
| 51 #include "tree.h" | |
|
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52 #include "tree-pretty-print.h" |
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53 #include "gimple-pretty-print.h" |
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54 #include "basic-block.h" |
| 0 | 55 #include "tree-flow.h" |
| 56 #include "gimple.h" | |
| 57 #include "tree-dump.h" | |
| 58 #include "tree-pass.h" | |
| 59 #include "timevar.h" | |
| 60 #include "flags.h" | |
| 61 #include "cfgloop.h" | |
| 62 #include "tree-scalar-evolution.h" | |
| 63 | |
| 64 static struct stmt_stats | |
| 65 { | |
| 66 int total; | |
| 67 int total_phis; | |
| 68 int removed; | |
| 69 int removed_phis; | |
| 70 } stats; | |
| 71 | |
| 72 #define STMT_NECESSARY GF_PLF_1 | |
| 73 | |
| 74 static VEC(gimple,heap) *worklist; | |
| 75 | |
| 76 /* Vector indicating an SSA name has already been processed and marked | |
| 77 as necessary. */ | |
| 78 static sbitmap processed; | |
| 79 | |
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80 /* Vector indicating that the last statement of a basic block has already |
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81 been marked as necessary. */ |
| 0 | 82 static sbitmap last_stmt_necessary; |
| 83 | |
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84 /* Vector indicating that BB contains statements that are live. */ |
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85 static sbitmap bb_contains_live_stmts; |
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86 |
| 0 | 87 /* Before we can determine whether a control branch is dead, we need to |
| 88 compute which blocks are control dependent on which edges. | |
| 89 | |
| 90 We expect each block to be control dependent on very few edges so we | |
| 91 use a bitmap for each block recording its edges. An array holds the | |
| 92 bitmap. The Ith bit in the bitmap is set if that block is dependent | |
| 93 on the Ith edge. */ | |
| 94 static bitmap *control_dependence_map; | |
| 95 | |
| 96 /* Vector indicating that a basic block has already had all the edges | |
| 97 processed that it is control dependent on. */ | |
| 98 static sbitmap visited_control_parents; | |
| 99 | |
| 100 /* TRUE if this pass alters the CFG (by removing control statements). | |
| 101 FALSE otherwise. | |
| 102 | |
| 103 If this pass alters the CFG, then it will arrange for the dominators | |
| 104 to be recomputed. */ | |
| 105 static bool cfg_altered; | |
| 106 | |
| 107 /* Execute code that follows the macro for each edge (given number | |
| 108 EDGE_NUMBER within the CODE) for which the block with index N is | |
| 109 control dependent. */ | |
| 110 #define EXECUTE_IF_CONTROL_DEPENDENT(BI, N, EDGE_NUMBER) \ | |
| 111 EXECUTE_IF_SET_IN_BITMAP (control_dependence_map[(N)], 0, \ | |
| 112 (EDGE_NUMBER), (BI)) | |
| 113 | |
| 114 | |
| 115 /* Indicate block BB is control dependent on an edge with index EDGE_INDEX. */ | |
| 116 static inline void | |
| 117 set_control_dependence_map_bit (basic_block bb, int edge_index) | |
| 118 { | |
| 119 if (bb == ENTRY_BLOCK_PTR) | |
| 120 return; | |
| 121 gcc_assert (bb != EXIT_BLOCK_PTR); | |
| 122 bitmap_set_bit (control_dependence_map[bb->index], edge_index); | |
| 123 } | |
| 124 | |
| 125 /* Clear all control dependences for block BB. */ | |
| 126 static inline void | |
| 127 clear_control_dependence_bitmap (basic_block bb) | |
| 128 { | |
| 129 bitmap_clear (control_dependence_map[bb->index]); | |
| 130 } | |
| 131 | |
| 132 | |
| 133 /* Find the immediate postdominator PDOM of the specified basic block BLOCK. | |
| 134 This function is necessary because some blocks have negative numbers. */ | |
| 135 | |
| 136 static inline basic_block | |
| 137 find_pdom (basic_block block) | |
| 138 { | |
| 139 gcc_assert (block != ENTRY_BLOCK_PTR); | |
| 140 | |
| 141 if (block == EXIT_BLOCK_PTR) | |
| 142 return EXIT_BLOCK_PTR; | |
| 143 else | |
| 144 { | |
| 145 basic_block bb = get_immediate_dominator (CDI_POST_DOMINATORS, block); | |
| 146 if (! bb) | |
| 147 return EXIT_BLOCK_PTR; | |
| 148 return bb; | |
| 149 } | |
| 150 } | |
| 151 | |
| 152 | |
| 153 /* Determine all blocks' control dependences on the given edge with edge_list | |
| 154 EL index EDGE_INDEX, ala Morgan, Section 3.6. */ | |
| 155 | |
| 156 static void | |
| 157 find_control_dependence (struct edge_list *el, int edge_index) | |
| 158 { | |
| 159 basic_block current_block; | |
| 160 basic_block ending_block; | |
| 161 | |
| 162 gcc_assert (INDEX_EDGE_PRED_BB (el, edge_index) != EXIT_BLOCK_PTR); | |
| 163 | |
| 164 if (INDEX_EDGE_PRED_BB (el, edge_index) == ENTRY_BLOCK_PTR) | |
| 165 ending_block = single_succ (ENTRY_BLOCK_PTR); | |
| 166 else | |
| 167 ending_block = find_pdom (INDEX_EDGE_PRED_BB (el, edge_index)); | |
| 168 | |
| 169 for (current_block = INDEX_EDGE_SUCC_BB (el, edge_index); | |
| 170 current_block != ending_block && current_block != EXIT_BLOCK_PTR; | |
| 171 current_block = find_pdom (current_block)) | |
| 172 { | |
| 173 edge e = INDEX_EDGE (el, edge_index); | |
| 174 | |
| 175 /* For abnormal edges, we don't make current_block control | |
| 176 dependent because instructions that throw are always necessary | |
| 177 anyway. */ | |
| 178 if (e->flags & EDGE_ABNORMAL) | |
| 179 continue; | |
| 180 | |
| 181 set_control_dependence_map_bit (current_block, edge_index); | |
| 182 } | |
| 183 } | |
| 184 | |
| 185 | |
| 186 /* Record all blocks' control dependences on all edges in the edge | |
| 187 list EL, ala Morgan, Section 3.6. */ | |
| 188 | |
| 189 static void | |
| 190 find_all_control_dependences (struct edge_list *el) | |
| 191 { | |
| 192 int i; | |
| 193 | |
| 194 for (i = 0; i < NUM_EDGES (el); ++i) | |
| 195 find_control_dependence (el, i); | |
| 196 } | |
| 197 | |
| 198 /* If STMT is not already marked necessary, mark it, and add it to the | |
| 199 worklist if ADD_TO_WORKLIST is true. */ | |
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200 |
| 0 | 201 static inline void |
| 202 mark_stmt_necessary (gimple stmt, bool add_to_worklist) | |
| 203 { | |
| 204 gcc_assert (stmt); | |
| 205 | |
| 206 if (gimple_plf (stmt, STMT_NECESSARY)) | |
| 207 return; | |
| 208 | |
| 209 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 210 { | |
| 211 fprintf (dump_file, "Marking useful stmt: "); | |
| 212 print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
| 213 fprintf (dump_file, "\n"); | |
| 214 } | |
| 215 | |
| 216 gimple_set_plf (stmt, STMT_NECESSARY, true); | |
| 217 if (add_to_worklist) | |
| 218 VEC_safe_push (gimple, heap, worklist, stmt); | |
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219 if (bb_contains_live_stmts && !is_gimple_debug (stmt)) |
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220 SET_BIT (bb_contains_live_stmts, gimple_bb (stmt)->index); |
| 0 | 221 } |
| 222 | |
| 223 | |
| 224 /* Mark the statement defining operand OP as necessary. */ | |
| 225 | |
| 226 static inline void | |
| 227 mark_operand_necessary (tree op) | |
| 228 { | |
| 229 gimple stmt; | |
| 230 int ver; | |
| 231 | |
| 232 gcc_assert (op); | |
| 233 | |
| 234 ver = SSA_NAME_VERSION (op); | |
| 235 if (TEST_BIT (processed, ver)) | |
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236 { |
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237 stmt = SSA_NAME_DEF_STMT (op); |
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238 gcc_assert (gimple_nop_p (stmt) |
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239 || gimple_plf (stmt, STMT_NECESSARY)); |
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240 return; |
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241 } |
| 0 | 242 SET_BIT (processed, ver); |
| 243 | |
| 244 stmt = SSA_NAME_DEF_STMT (op); | |
| 245 gcc_assert (stmt); | |
| 246 | |
| 247 if (gimple_plf (stmt, STMT_NECESSARY) || gimple_nop_p (stmt)) | |
| 248 return; | |
| 249 | |
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250 if (dump_file && (dump_flags & TDF_DETAILS)) |
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251 { |
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252 fprintf (dump_file, "marking necessary through "); |
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253 print_generic_expr (dump_file, op, 0); |
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254 fprintf (dump_file, " stmt "); |
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255 print_gimple_stmt (dump_file, stmt, 0, 0); |
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256 } |
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257 |
| 0 | 258 gimple_set_plf (stmt, STMT_NECESSARY, true); |
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259 if (bb_contains_live_stmts) |
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260 SET_BIT (bb_contains_live_stmts, gimple_bb (stmt)->index); |
| 0 | 261 VEC_safe_push (gimple, heap, worklist, stmt); |
| 262 } | |
| 263 | |
| 264 | |
| 265 /* Mark STMT as necessary if it obviously is. Add it to the worklist if | |
| 266 it can make other statements necessary. | |
| 267 | |
| 268 If AGGRESSIVE is false, control statements are conservatively marked as | |
| 269 necessary. */ | |
| 270 | |
| 271 static void | |
| 272 mark_stmt_if_obviously_necessary (gimple stmt, bool aggressive) | |
| 273 { | |
| 274 tree lhs = NULL_TREE; | |
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275 |
| 0 | 276 /* With non-call exceptions, we have to assume that all statements could |
| 277 throw. If a statement may throw, it is inherently necessary. */ | |
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278 if (cfun->can_throw_non_call_exceptions && stmt_could_throw_p (stmt)) |
| 0 | 279 { |
| 280 mark_stmt_necessary (stmt, true); | |
| 281 return; | |
| 282 } | |
| 283 | |
| 284 /* Statements that are implicitly live. Most function calls, asm | |
| 285 and return statements are required. Labels and GIMPLE_BIND nodes | |
| 286 are kept because they are control flow, and we have no way of | |
| 287 knowing whether they can be removed. DCE can eliminate all the | |
| 288 other statements in a block, and CFG can then remove the block | |
| 289 and labels. */ | |
| 290 switch (gimple_code (stmt)) | |
| 291 { | |
| 292 case GIMPLE_PREDICT: | |
| 293 case GIMPLE_LABEL: | |
| 294 mark_stmt_necessary (stmt, false); | |
| 295 return; | |
| 296 | |
| 297 case GIMPLE_ASM: | |
| 298 case GIMPLE_RESX: | |
| 299 case GIMPLE_RETURN: | |
| 300 mark_stmt_necessary (stmt, true); | |
| 301 return; | |
| 302 | |
| 303 case GIMPLE_CALL: | |
| 304 /* Most, but not all function calls are required. Function calls that | |
| 305 produce no result and have no side effects (i.e. const pure | |
| 306 functions) are unnecessary. */ | |
| 307 if (gimple_has_side_effects (stmt)) | |
| 308 { | |
| 309 mark_stmt_necessary (stmt, true); | |
| 310 return; | |
| 311 } | |
| 312 if (!gimple_call_lhs (stmt)) | |
| 313 return; | |
| 314 lhs = gimple_call_lhs (stmt); | |
| 315 /* Fall through */ | |
| 316 | |
| 317 case GIMPLE_ASSIGN: | |
| 318 if (!lhs) | |
| 319 lhs = gimple_assign_lhs (stmt); | |
| 320 break; | |
| 321 | |
|
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322 case GIMPLE_DEBUG: |
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323 /* Debug temps without a value are not useful. ??? If we could |
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324 easily locate the debug temp bind stmt for a use thereof, |
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325 would could refrain from marking all debug temps here, and |
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326 mark them only if they're used. */ |
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327 if (gimple_debug_bind_has_value_p (stmt) |
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328 || TREE_CODE (gimple_debug_bind_get_var (stmt)) != DEBUG_EXPR_DECL) |
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329 mark_stmt_necessary (stmt, false); |
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330 return; |
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331 |
| 0 | 332 case GIMPLE_GOTO: |
| 333 gcc_assert (!simple_goto_p (stmt)); | |
| 334 mark_stmt_necessary (stmt, true); | |
| 335 return; | |
| 336 | |
| 337 case GIMPLE_COND: | |
| 338 gcc_assert (EDGE_COUNT (gimple_bb (stmt)->succs) == 2); | |
| 339 /* Fall through. */ | |
| 340 | |
| 341 case GIMPLE_SWITCH: | |
| 342 if (! aggressive) | |
| 343 mark_stmt_necessary (stmt, true); | |
| 344 break; | |
| 345 | |
| 346 default: | |
| 347 break; | |
| 348 } | |
| 349 | |
| 350 /* If the statement has volatile operands, it needs to be preserved. | |
| 351 Same for statements that can alter control flow in unpredictable | |
| 352 ways. */ | |
| 353 if (gimple_has_volatile_ops (stmt) || is_ctrl_altering_stmt (stmt)) | |
| 354 { | |
| 355 mark_stmt_necessary (stmt, true); | |
| 356 return; | |
| 357 } | |
| 358 | |
| 359 if (is_hidden_global_store (stmt)) | |
| 360 { | |
| 361 mark_stmt_necessary (stmt, true); | |
| 362 return; | |
| 363 } | |
| 364 | |
| 365 return; | |
| 366 } | |
| 367 | |
| 368 | |
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369 /* Mark the last statement of BB as necessary. */ |
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370 |
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371 static void |
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372 mark_last_stmt_necessary (basic_block bb) |
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373 { |
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374 gimple stmt = last_stmt (bb); |
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375 |
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376 SET_BIT (last_stmt_necessary, bb->index); |
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377 SET_BIT (bb_contains_live_stmts, bb->index); |
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378 |
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379 /* We actually mark the statement only if it is a control statement. */ |
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380 if (stmt && is_ctrl_stmt (stmt)) |
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381 mark_stmt_necessary (stmt, true); |
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382 } |
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383 |
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384 |
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385 /* Mark control dependent edges of BB as necessary. We have to do this only |
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386 once for each basic block so we set the appropriate bit after we're done. |
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387 |
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388 When IGNORE_SELF is true, ignore BB in the list of control dependences. */ |
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389 |
| 0 | 390 static void |
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391 mark_control_dependent_edges_necessary (basic_block bb, struct edge_list *el, |
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392 bool ignore_self) |
| 0 | 393 { |
| 394 bitmap_iterator bi; | |
| 395 unsigned edge_number; | |
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396 bool skipped = false; |
| 0 | 397 |
| 398 gcc_assert (bb != EXIT_BLOCK_PTR); | |
| 399 | |
| 400 if (bb == ENTRY_BLOCK_PTR) | |
| 401 return; | |
| 402 | |
| 403 EXECUTE_IF_CONTROL_DEPENDENT (bi, bb->index, edge_number) | |
| 404 { | |
| 405 basic_block cd_bb = INDEX_EDGE_PRED_BB (el, edge_number); | |
| 406 | |
|
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407 if (ignore_self && cd_bb == bb) |
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408 { |
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409 skipped = true; |
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410 continue; |
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411 } |
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412 |
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413 if (!TEST_BIT (last_stmt_necessary, cd_bb->index)) |
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414 mark_last_stmt_necessary (cd_bb); |
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415 } |
| 0 | 416 |
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417 if (!skipped) |
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418 SET_BIT (visited_control_parents, bb->index); |
| 0 | 419 } |
| 420 | |
| 421 | |
| 422 /* Find obviously necessary statements. These are things like most function | |
| 423 calls, and stores to file level variables. | |
| 424 | |
| 425 If EL is NULL, control statements are conservatively marked as | |
| 426 necessary. Otherwise it contains the list of edges used by control | |
| 427 dependence analysis. */ | |
| 428 | |
| 429 static void | |
| 430 find_obviously_necessary_stmts (struct edge_list *el) | |
| 431 { | |
| 432 basic_block bb; | |
| 433 gimple_stmt_iterator gsi; | |
| 434 edge e; | |
| 435 gimple phi, stmt; | |
|
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436 int flags; |
| 0 | 437 |
| 438 FOR_EACH_BB (bb) | |
| 439 { | |
| 440 /* PHI nodes are never inherently necessary. */ | |
| 441 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 442 { | |
| 443 phi = gsi_stmt (gsi); | |
| 444 gimple_set_plf (phi, STMT_NECESSARY, false); | |
| 445 } | |
| 446 | |
| 447 /* Check all statements in the block. */ | |
| 448 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 449 { | |
| 450 stmt = gsi_stmt (gsi); | |
| 451 gimple_set_plf (stmt, STMT_NECESSARY, false); | |
| 452 mark_stmt_if_obviously_necessary (stmt, el != NULL); | |
| 453 } | |
| 454 } | |
| 455 | |
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456 /* Pure and const functions are finite and thus have no infinite loops in |
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457 them. */ |
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458 flags = flags_from_decl_or_type (current_function_decl); |
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459 if ((flags & (ECF_CONST|ECF_PURE)) && !(flags & ECF_LOOPING_CONST_OR_PURE)) |
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460 return; |
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461 |
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462 /* Prevent the empty possibly infinite loops from being removed. */ |
| 0 | 463 if (el) |
| 464 { | |
|
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465 loop_iterator li; |
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466 struct loop *loop; |
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467 scev_initialize (); |
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468 if (mark_irreducible_loops ()) |
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469 FOR_EACH_BB (bb) |
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470 { |
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471 edge_iterator ei; |
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472 FOR_EACH_EDGE (e, ei, bb->succs) |
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473 if ((e->flags & EDGE_DFS_BACK) |
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474 && (e->flags & EDGE_IRREDUCIBLE_LOOP)) |
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475 { |
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476 if (dump_file) |
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477 fprintf (dump_file, "Marking back edge of irreducible loop %i->%i\n", |
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478 e->src->index, e->dest->index); |
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479 mark_control_dependent_edges_necessary (e->dest, el, false); |
|
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480 } |
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481 } |
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482 |
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483 FOR_EACH_LOOP (li, loop, 0) |
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484 if (!finite_loop_p (loop)) |
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485 { |
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486 if (dump_file) |
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487 fprintf (dump_file, "can not prove finiteness of loop %i\n", loop->num); |
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488 mark_control_dependent_edges_necessary (loop->latch, el, false); |
|
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489 } |
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490 scev_finalize (); |
| 0 | 491 } |
| 492 } | |
| 493 | |
| 494 | |
|
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495 /* Return true if REF is based on an aliased base, otherwise false. */ |
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496 |
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497 static bool |
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498 ref_may_be_aliased (tree ref) |
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499 { |
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500 while (handled_component_p (ref)) |
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501 ref = TREE_OPERAND (ref, 0); |
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502 if (TREE_CODE (ref) == MEM_REF |
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503 && TREE_CODE (TREE_OPERAND (ref, 0)) == ADDR_EXPR) |
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504 ref = TREE_OPERAND (TREE_OPERAND (ref, 0), 0); |
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505 return !(DECL_P (ref) |
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506 && !may_be_aliased (ref)); |
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507 } |
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508 |
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509 static bitmap visited = NULL; |
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510 static unsigned int longest_chain = 0; |
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511 static unsigned int total_chain = 0; |
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512 static unsigned int nr_walks = 0; |
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513 static bool chain_ovfl = false; |
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514 |
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
515 /* Worker for the walker that marks reaching definitions of REF, |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
516 which is based on a non-aliased decl, necessary. It returns |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
517 true whenever the defining statement of the current VDEF is |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
518 a kill for REF, as no dominating may-defs are necessary for REF |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
519 anymore. DATA points to the basic-block that contains the |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
520 stmt that refers to REF. */ |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
521 |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
522 static bool |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
523 mark_aliased_reaching_defs_necessary_1 (ao_ref *ref, tree vdef, void *data) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
524 { |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
525 gimple def_stmt = SSA_NAME_DEF_STMT (vdef); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
526 |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
527 /* All stmts we visit are necessary. */ |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
528 mark_operand_necessary (vdef); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
529 |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
530 /* If the stmt lhs kills ref, then we can stop walking. */ |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
531 if (gimple_has_lhs (def_stmt) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
532 && TREE_CODE (gimple_get_lhs (def_stmt)) != SSA_NAME) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
533 { |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
534 tree base, lhs = gimple_get_lhs (def_stmt); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
535 HOST_WIDE_INT size, offset, max_size; |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
536 ao_ref_base (ref); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
537 base = get_ref_base_and_extent (lhs, &offset, &size, &max_size); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
538 /* We can get MEM[symbol: sZ, index: D.8862_1] here, |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
539 so base == refd->base does not always hold. */ |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
540 if (base == ref->base) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
541 { |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
542 /* For a must-alias check we need to be able to constrain |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
543 the accesses properly. */ |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
544 if (size != -1 && size == max_size |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
545 && ref->max_size != -1) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
546 { |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
547 if (offset <= ref->offset |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
548 && offset + size >= ref->offset + ref->max_size) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
549 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
550 } |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
551 /* Or they need to be exactly the same. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
552 else if (ref->ref |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
553 /* Make sure there is no induction variable involved |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
554 in the references (gcc.c-torture/execute/pr42142.c). |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
555 The simplest way is to check if the kill dominates |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
556 the use. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
557 && dominated_by_p (CDI_DOMINATORS, (basic_block) data, |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
558 gimple_bb (def_stmt)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
559 && operand_equal_p (ref->ref, lhs, 0)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
560 return true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
561 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
562 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
563 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
564 /* Otherwise keep walking. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
565 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
566 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
567 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
568 static void |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
569 mark_aliased_reaching_defs_necessary (gimple stmt, tree ref) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
570 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
571 unsigned int chain; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
572 ao_ref refd; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
573 gcc_assert (!chain_ovfl); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
574 ao_ref_init (&refd, ref); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
575 chain = walk_aliased_vdefs (&refd, gimple_vuse (stmt), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
576 mark_aliased_reaching_defs_necessary_1, |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
577 gimple_bb (stmt), NULL); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
578 if (chain > longest_chain) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
579 longest_chain = chain; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
580 total_chain += chain; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
581 nr_walks++; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
582 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
583 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
584 /* Worker for the walker that marks reaching definitions of REF, which |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
585 is not based on a non-aliased decl. For simplicity we need to end |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
586 up marking all may-defs necessary that are not based on a non-aliased |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
587 decl. The only job of this walker is to skip may-defs based on |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
588 a non-aliased decl. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
589 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
590 static bool |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
591 mark_all_reaching_defs_necessary_1 (ao_ref *ref ATTRIBUTE_UNUSED, |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
592 tree vdef, void *data ATTRIBUTE_UNUSED) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
593 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
594 gimple def_stmt = SSA_NAME_DEF_STMT (vdef); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
595 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
596 /* We have to skip already visited (and thus necessary) statements |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
597 to make the chaining work after we dropped back to simple mode. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
598 if (chain_ovfl |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
599 && TEST_BIT (processed, SSA_NAME_VERSION (vdef))) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
600 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
601 gcc_assert (gimple_nop_p (def_stmt) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
602 || gimple_plf (def_stmt, STMT_NECESSARY)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
603 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
604 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
605 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
606 /* We want to skip stores to non-aliased variables. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
607 if (!chain_ovfl |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
608 && gimple_assign_single_p (def_stmt)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
609 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
610 tree lhs = gimple_assign_lhs (def_stmt); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
611 if (!ref_may_be_aliased (lhs)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
612 return false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
613 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
614 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
615 mark_operand_necessary (vdef); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
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|
616 |
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617 return false; |
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618 } |
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619 |
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620 static void |
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621 mark_all_reaching_defs_necessary (gimple stmt) |
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622 { |
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623 walk_aliased_vdefs (NULL, gimple_vuse (stmt), |
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624 mark_all_reaching_defs_necessary_1, NULL, &visited); |
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625 } |
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626 |
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627 /* Return true for PHI nodes with one or identical arguments |
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628 can be removed. */ |
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629 static bool |
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630 degenerate_phi_p (gimple phi) |
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631 { |
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632 unsigned int i; |
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633 tree op = gimple_phi_arg_def (phi, 0); |
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634 for (i = 1; i < gimple_phi_num_args (phi); i++) |
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635 if (gimple_phi_arg_def (phi, i) != op) |
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636 return false; |
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637 return true; |
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638 } |
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639 |
| 0 | 640 /* Propagate necessity using the operands of necessary statements. |
| 641 Process the uses on each statement in the worklist, and add all | |
| 642 feeding statements which contribute to the calculation of this | |
|
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643 value to the worklist. |
| 0 | 644 |
| 645 In conservative mode, EL is NULL. */ | |
| 646 | |
| 647 static void | |
| 648 propagate_necessity (struct edge_list *el) | |
| 649 { | |
| 650 gimple stmt; | |
|
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651 bool aggressive = (el ? true : false); |
| 0 | 652 |
| 653 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 654 fprintf (dump_file, "\nProcessing worklist:\n"); | |
| 655 | |
| 656 while (VEC_length (gimple, worklist) > 0) | |
| 657 { | |
| 658 /* Take STMT from worklist. */ | |
| 659 stmt = VEC_pop (gimple, worklist); | |
| 660 | |
| 661 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 662 { | |
| 663 fprintf (dump_file, "processing: "); | |
| 664 print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
| 665 fprintf (dump_file, "\n"); | |
| 666 } | |
| 667 | |
| 668 if (aggressive) | |
| 669 { | |
|
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670 /* Mark the last statement of the basic blocks on which the block |
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671 containing STMT is control dependent, but only if we haven't |
| 0 | 672 already done so. */ |
| 673 basic_block bb = gimple_bb (stmt); | |
| 674 if (bb != ENTRY_BLOCK_PTR | |
|
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675 && !TEST_BIT (visited_control_parents, bb->index)) |
|
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676 mark_control_dependent_edges_necessary (bb, el, false); |
| 0 | 677 } |
| 678 | |
|
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679 if (gimple_code (stmt) == GIMPLE_PHI |
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680 /* We do not process virtual PHI nodes nor do we track their |
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681 necessity. */ |
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682 && is_gimple_reg (gimple_phi_result (stmt))) |
| 0 | 683 { |
| 684 /* PHI nodes are somewhat special in that each PHI alternative has | |
| 685 data and control dependencies. All the statements feeding the | |
| 686 PHI node's arguments are always necessary. In aggressive mode, | |
| 687 we also consider the control dependent edges leading to the | |
| 688 predecessor block associated with each PHI alternative as | |
| 689 necessary. */ | |
| 690 size_t k; | |
| 691 | |
| 692 for (k = 0; k < gimple_phi_num_args (stmt); k++) | |
| 693 { | |
| 694 tree arg = PHI_ARG_DEF (stmt, k); | |
| 695 if (TREE_CODE (arg) == SSA_NAME) | |
| 696 mark_operand_necessary (arg); | |
| 697 } | |
| 698 | |
|
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699 /* For PHI operands it matters from where the control flow arrives |
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700 to the BB. Consider the following example: |
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701 |
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702 a=exp1; |
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703 b=exp2; |
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704 if (test) |
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705 ; |
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706 else |
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707 ; |
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708 c=PHI(a,b) |
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709 |
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710 We need to mark control dependence of the empty basic blocks, since they |
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711 contains computation of PHI operands. |
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712 |
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713 Doing so is too restrictive in the case the predecestor block is in |
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714 the loop. Consider: |
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715 |
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716 if (b) |
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717 { |
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718 int i; |
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719 for (i = 0; i<1000; ++i) |
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720 ; |
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721 j = 0; |
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722 } |
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723 return j; |
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724 |
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725 There is PHI for J in the BB containing return statement. |
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726 In this case the control dependence of predecestor block (that is |
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727 within the empty loop) also contains the block determining number |
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728 of iterations of the block that would prevent removing of empty |
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729 loop in this case. |
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|
730 |
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731 This scenario can be avoided by splitting critical edges. |
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732 To save the critical edge splitting pass we identify how the control |
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733 dependence would look like if the edge was split. |
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734 |
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735 Consider the modified CFG created from current CFG by splitting |
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736 edge B->C. In the postdominance tree of modified CFG, C' is |
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737 always child of C. There are two cases how chlids of C' can look |
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738 like: |
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739 |
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740 1) C' is leaf |
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741 |
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742 In this case the only basic block C' is control dependent on is B. |
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743 |
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744 2) C' has single child that is B |
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745 |
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746 In this case control dependence of C' is same as control |
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747 dependence of B in original CFG except for block B itself. |
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748 (since C' postdominate B in modified CFG) |
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749 |
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750 Now how to decide what case happens? There are two basic options: |
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751 |
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752 a) C postdominate B. Then C immediately postdominate B and |
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753 case 2 happens iff there is no other way from B to C except |
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754 the edge B->C. |
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|
755 |
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756 There is other way from B to C iff there is succesor of B that |
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757 is not postdominated by B. Testing this condition is somewhat |
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758 expensive, because we need to iterate all succesors of B. |
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55
diff
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|
759 We are safe to assume that this does not happen: we will mark B |
|
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diff
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|
760 as needed when processing the other path from B to C that is |
|
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parents:
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diff
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|
761 conrol dependent on B and marking control dependencies of B |
|
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diff
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|
762 itself is harmless because they will be processed anyway after |
|
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parents:
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diff
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|
763 processing control statement in B. |
|
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|
764 |
|
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parents:
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765 b) C does not postdominate B. Always case 1 happens since there is |
|
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parents:
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diff
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766 path from C to exit that does not go through B and thus also C'. */ |
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parents:
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|
767 |
|
55
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parents:
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diff
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|
768 if (aggressive && !degenerate_phi_p (stmt)) |
| 0 | 769 { |
| 770 for (k = 0; k < gimple_phi_num_args (stmt); k++) | |
| 771 { | |
| 772 basic_block arg_bb = gimple_phi_arg_edge (stmt, k)->src; | |
|
63
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diff
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|
773 |
|
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parents:
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diff
changeset
|
774 if (gimple_bb (stmt) |
|
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parents:
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|
775 != get_immediate_dominator (CDI_POST_DOMINATORS, arg_bb)) |
| 0 | 776 { |
|
63
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parents:
55
diff
changeset
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777 if (!TEST_BIT (last_stmt_necessary, arg_bb->index)) |
|
67
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parents:
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diff
changeset
|
778 mark_last_stmt_necessary (arg_bb); |
| 0 | 779 } |
|
63
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parents:
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780 else if (arg_bb != ENTRY_BLOCK_PTR |
|
67
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parents:
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diff
changeset
|
781 && !TEST_BIT (visited_control_parents, |
|
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parents:
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diff
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|
782 arg_bb->index)) |
|
63
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diff
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|
783 mark_control_dependent_edges_necessary (arg_bb, el, true); |
| 0 | 784 } |
| 785 } | |
| 786 } | |
| 787 else | |
| 788 { | |
| 789 /* Propagate through the operands. Examine all the USE, VUSE and | |
|
55
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parents:
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diff
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|
790 VDEF operands in this statement. Mark all the statements |
|
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parents:
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diff
changeset
|
791 which feed this statement's uses as necessary. */ |
| 0 | 792 ssa_op_iter iter; |
| 793 tree use; | |
| 794 | |
|
55
77e2b8dfacca
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parents:
0
diff
changeset
|
795 FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_USE) |
| 0 | 796 mark_operand_necessary (use); |
|
55
77e2b8dfacca
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parents:
0
diff
changeset
|
797 |
|
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parents:
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diff
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|
798 use = gimple_vuse (stmt); |
|
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parents:
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diff
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|
799 if (!use) |
|
77e2b8dfacca
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parents:
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diff
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|
800 continue; |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
801 |
|
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parents:
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diff
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|
802 /* If we dropped to simple mode make all immediately |
|
77e2b8dfacca
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parents:
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diff
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|
803 reachable definitions necessary. */ |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
804 if (chain_ovfl) |
|
77e2b8dfacca
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parents:
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diff
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|
805 { |
|
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parents:
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diff
changeset
|
806 mark_all_reaching_defs_necessary (stmt); |
|
77e2b8dfacca
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parents:
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diff
changeset
|
807 continue; |
|
77e2b8dfacca
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parents:
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diff
changeset
|
808 } |
|
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parents:
0
diff
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|
809 |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
810 /* For statements that may load from memory (have a VUSE) we |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
811 have to mark all reaching (may-)definitions as necessary. |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
812 We partition this task into two cases: |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
813 1) explicit loads based on decls that are not aliased |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
814 2) implicit loads (like calls) and explicit loads not |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
815 based on decls that are not aliased (like indirect |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
816 references or loads from globals) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
817 For 1) we mark all reaching may-defs as necessary, stopping |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
818 at dominating kills. For 2) we want to mark all dominating |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
819 references necessary, but non-aliased ones which we handle |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
820 in 1). By keeping a global visited bitmap for references |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
821 we walk for 2) we avoid quadratic behavior for those. */ |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
822 |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
823 if (is_gimple_call (stmt)) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
824 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
825 tree callee = gimple_call_fndecl (stmt); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
826 unsigned i; |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
827 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
828 /* Calls to functions that are merely acting as barriers |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
829 or that only store to memory do not make any previous |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
830 stores necessary. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
831 if (callee != NULL_TREE |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
832 && DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
833 && (DECL_FUNCTION_CODE (callee) == BUILT_IN_MEMSET |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
834 || DECL_FUNCTION_CODE (callee) == BUILT_IN_MALLOC |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
835 || DECL_FUNCTION_CODE (callee) == BUILT_IN_FREE)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
836 continue; |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
837 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
838 /* Calls implicitly load from memory, their arguments |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
839 in addition may explicitly perform memory loads. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
840 mark_all_reaching_defs_necessary (stmt); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
841 for (i = 0; i < gimple_call_num_args (stmt); ++i) |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
842 { |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
843 tree arg = gimple_call_arg (stmt, i); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
844 if (TREE_CODE (arg) == SSA_NAME |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
845 || is_gimple_min_invariant (arg)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
846 continue; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
847 if (!ref_may_be_aliased (arg)) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
848 mark_aliased_reaching_defs_necessary (stmt, arg); |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
849 } |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
850 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
851 else if (gimple_assign_single_p (stmt)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
852 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
853 tree rhs; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
854 bool rhs_aliased = false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
855 /* If this is a load mark things necessary. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
856 rhs = gimple_assign_rhs1 (stmt); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
857 if (TREE_CODE (rhs) != SSA_NAME |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
858 && !is_gimple_min_invariant (rhs)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
859 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
860 if (!ref_may_be_aliased (rhs)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
861 mark_aliased_reaching_defs_necessary (stmt, rhs); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
862 else |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
863 rhs_aliased = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
864 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
865 if (rhs_aliased) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
866 mark_all_reaching_defs_necessary (stmt); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
867 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
868 else if (gimple_code (stmt) == GIMPLE_RETURN) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
869 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
870 tree rhs = gimple_return_retval (stmt); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
871 /* A return statement may perform a load. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
872 if (TREE_CODE (rhs) != SSA_NAME |
|
77e2b8dfacca
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parents:
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diff
changeset
|
873 && !is_gimple_min_invariant (rhs)) |
|
77e2b8dfacca
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parents:
0
diff
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|
874 { |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
875 if (!ref_may_be_aliased (rhs)) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
876 mark_aliased_reaching_defs_necessary (stmt, rhs); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
877 else |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
878 mark_all_reaching_defs_necessary (stmt); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
879 } |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
880 } |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
881 else if (gimple_code (stmt) == GIMPLE_ASM) |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
882 { |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
883 unsigned i; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
884 mark_all_reaching_defs_necessary (stmt); |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
885 /* Inputs may perform loads. */ |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
886 for (i = 0; i < gimple_asm_ninputs (stmt); ++i) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
887 { |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
888 tree op = TREE_VALUE (gimple_asm_input_op (stmt, i)); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
889 if (TREE_CODE (op) != SSA_NAME |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
890 && !is_gimple_min_invariant (op) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
891 && !ref_may_be_aliased (op)) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
892 mark_aliased_reaching_defs_necessary (stmt, op); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
893 } |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
894 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
895 else |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
896 gcc_unreachable (); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
897 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
898 /* If we over-used our alias oracle budget drop to simple |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
899 mode. The cost metric allows quadratic behavior |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
900 (number of uses times number of may-defs queries) up to |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
901 a constant maximal number of queries and after that falls back to |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
902 super-linear complexity. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
903 if (/* Constant but quadratic for small functions. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
904 total_chain > 128 * 128 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
905 /* Linear in the number of may-defs. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
906 && total_chain > 32 * longest_chain |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
907 /* Linear in the number of uses. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
908 && total_chain > nr_walks * 32) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
909 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
910 chain_ovfl = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
911 if (visited) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
912 bitmap_clear (visited); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
913 } |
| 0 | 914 } |
| 915 } | |
| 916 } | |
| 917 | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
918 /* Replace all uses of result of PHI by underlying variable and mark it |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
919 for renaming. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
920 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
921 void |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
922 mark_virtual_phi_result_for_renaming (gimple phi) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
923 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
924 bool used = false; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
925 imm_use_iterator iter; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
926 use_operand_p use_p; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
927 gimple stmt; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
928 tree result_ssa, result_var; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
929 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
930 if (dump_file && (dump_flags & TDF_DETAILS)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
931 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
932 fprintf (dump_file, "Marking result for renaming : "); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
933 print_gimple_stmt (dump_file, phi, 0, TDF_SLIM); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
934 fprintf (dump_file, "\n"); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
935 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
936 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
937 result_ssa = gimple_phi_result (phi); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
938 result_var = SSA_NAME_VAR (result_ssa); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
939 FOR_EACH_IMM_USE_STMT (stmt, iter, result_ssa) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
940 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
941 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
942 SET_USE (use_p, result_var); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
943 update_stmt (stmt); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
944 used = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
945 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
946 if (used) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
947 mark_sym_for_renaming (result_var); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
948 } |
| 0 | 949 |
| 950 /* Remove dead PHI nodes from block BB. */ | |
| 951 | |
| 952 static bool | |
| 953 remove_dead_phis (basic_block bb) | |
| 954 { | |
| 955 bool something_changed = false; | |
| 956 gimple_seq phis; | |
| 957 gimple phi; | |
| 958 gimple_stmt_iterator gsi; | |
| 959 phis = phi_nodes (bb); | |
| 960 | |
| 961 for (gsi = gsi_start (phis); !gsi_end_p (gsi);) | |
| 962 { | |
| 963 stats.total_phis++; | |
| 964 phi = gsi_stmt (gsi); | |
| 965 | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
966 /* We do not track necessity of virtual PHI nodes. Instead do |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
967 very simple dead PHI removal here. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
968 if (!is_gimple_reg (gimple_phi_result (phi))) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
969 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
970 /* Virtual PHI nodes with one or identical arguments |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
971 can be removed. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
972 if (degenerate_phi_p (phi)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
973 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
974 tree vdef = gimple_phi_result (phi); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
975 tree vuse = gimple_phi_arg_def (phi, 0); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
976 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
977 use_operand_p use_p; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
978 imm_use_iterator iter; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
979 gimple use_stmt; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
980 FOR_EACH_IMM_USE_STMT (use_stmt, iter, vdef) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
981 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
982 SET_USE (use_p, vuse); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
983 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vdef) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
984 && TREE_CODE (vuse) == SSA_NAME) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
985 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vuse) = 1; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
986 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
987 else |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
988 gimple_set_plf (phi, STMT_NECESSARY, true); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
989 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
990 |
| 0 | 991 if (!gimple_plf (phi, STMT_NECESSARY)) |
| 992 { | |
| 993 something_changed = true; | |
| 994 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 995 { | |
| 996 fprintf (dump_file, "Deleting : "); | |
| 997 print_gimple_stmt (dump_file, phi, 0, TDF_SLIM); | |
| 998 fprintf (dump_file, "\n"); | |
| 999 } | |
| 1000 | |
| 1001 remove_phi_node (&gsi, true); | |
| 1002 stats.removed_phis++; | |
|
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1003 continue; |
| 0 | 1004 } |
|
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1005 |
|
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1006 gsi_next (&gsi); |
| 0 | 1007 } |
| 1008 return something_changed; | |
| 1009 } | |
| 1010 | |
|
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1011 /* Forward edge E to respective POST_DOM_BB and update PHIs. */ |
|
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1012 |
|
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1013 static edge |
|
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1014 forward_edge_to_pdom (edge e, basic_block post_dom_bb) |
|
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1015 { |
|
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|
1016 gimple_stmt_iterator gsi; |
|
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1017 edge e2 = NULL; |
|
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1018 edge_iterator ei; |
|
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1019 |
|
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1020 if (dump_file && (dump_flags & TDF_DETAILS)) |
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1021 fprintf (dump_file, "Redirecting edge %i->%i to %i\n", e->src->index, |
|
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1022 e->dest->index, post_dom_bb->index); |
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1023 |
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1024 e2 = redirect_edge_and_branch (e, post_dom_bb); |
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1025 cfg_altered = true; |
|
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1026 |
|
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1027 /* If edge was already around, no updating is neccesary. */ |
|
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1028 if (e2 != e) |
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1029 return e2; |
|
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1030 |
|
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1031 if (!gimple_seq_empty_p (phi_nodes (post_dom_bb))) |
|
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1032 { |
|
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1033 /* We are sure that for every live PHI we are seeing control dependent BB. |
|
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1034 This means that we can pick any edge to duplicate PHI args from. */ |
|
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1035 FOR_EACH_EDGE (e2, ei, post_dom_bb->preds) |
|
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1036 if (e2 != e) |
|
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1037 break; |
|
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1038 for (gsi = gsi_start_phis (post_dom_bb); !gsi_end_p (gsi);) |
|
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1039 { |
|
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1040 gimple phi = gsi_stmt (gsi); |
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1041 tree op; |
|
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1042 source_location locus; |
|
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1043 |
|
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1044 /* PHIs for virtuals have no control dependency relation on them. |
|
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1045 We are lost here and must force renaming of the symbol. */ |
|
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1046 if (!is_gimple_reg (gimple_phi_result (phi))) |
|
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1047 { |
|
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1048 mark_virtual_phi_result_for_renaming (phi); |
|
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1049 remove_phi_node (&gsi, true); |
|
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1050 continue; |
|
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1051 } |
|
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1052 |
|
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1053 /* Dead PHI do not imply control dependency. */ |
|
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1054 if (!gimple_plf (phi, STMT_NECESSARY)) |
|
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1055 { |
|
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1056 gsi_next (&gsi); |
|
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1057 continue; |
|
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1058 } |
|
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1059 |
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1060 op = gimple_phi_arg_def (phi, e2->dest_idx); |
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1061 locus = gimple_phi_arg_location (phi, e2->dest_idx); |
|
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1062 add_phi_arg (phi, op, e, locus); |
|
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1063 /* The resulting PHI if not dead can only be degenerate. */ |
|
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1064 gcc_assert (degenerate_phi_p (phi)); |
|
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1065 gsi_next (&gsi); |
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1066 } |
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1067 } |
|
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1068 return e; |
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1069 } |
| 0 | 1070 |
| 1071 /* Remove dead statement pointed to by iterator I. Receives the basic block BB | |
| 1072 containing I so that we don't have to look it up. */ | |
| 1073 | |
| 1074 static void | |
| 1075 remove_dead_stmt (gimple_stmt_iterator *i, basic_block bb) | |
| 1076 { | |
| 1077 gimple stmt = gsi_stmt (*i); | |
| 1078 | |
| 1079 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1080 { | |
| 1081 fprintf (dump_file, "Deleting : "); | |
| 1082 print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
| 1083 fprintf (dump_file, "\n"); | |
| 1084 } | |
| 1085 | |
| 1086 stats.removed++; | |
| 1087 | |
| 1088 /* If we have determined that a conditional branch statement contributes | |
| 1089 nothing to the program, then we not only remove it, but we also change | |
| 1090 the flow graph so that the current block will simply fall-thru to its | |
| 1091 immediate post-dominator. The blocks we are circumventing will be | |
| 1092 removed by cleanup_tree_cfg if this change in the flow graph makes them | |
| 1093 unreachable. */ | |
| 1094 if (is_ctrl_stmt (stmt)) | |
| 1095 { | |
| 1096 basic_block post_dom_bb; | |
|
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1097 edge e, e2; |
|
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1098 edge_iterator ei; |
| 0 | 1099 |
|
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1100 post_dom_bb = get_immediate_dominator (CDI_POST_DOMINATORS, bb); |
| 0 | 1101 |
|
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1102 e = find_edge (bb, post_dom_bb); |
| 0 | 1103 |
|
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1104 /* If edge is already there, try to use it. This avoids need to update |
|
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1105 PHI nodes. Also watch for cases where post dominator does not exists |
|
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1106 or is exit block. These can happen for infinite loops as we create |
|
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1107 fake edges in the dominator tree. */ |
|
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1108 if (e) |
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1109 ; |
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1110 else if (! post_dom_bb || post_dom_bb == EXIT_BLOCK_PTR) |
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1111 e = EDGE_SUCC (bb, 0); |
| 0 | 1112 else |
|
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1113 e = forward_edge_to_pdom (EDGE_SUCC (bb, 0), post_dom_bb); |
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1114 gcc_assert (e); |
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1115 e->probability = REG_BR_PROB_BASE; |
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1116 e->count = bb->count; |
| 0 | 1117 |
| 1118 /* The edge is no longer associated with a conditional, so it does | |
| 1119 not have TRUE/FALSE flags. */ | |
|
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1120 e->flags &= ~(EDGE_TRUE_VALUE | EDGE_FALSE_VALUE); |
| 0 | 1121 |
| 1122 /* The lone outgoing edge from BB will be a fallthru edge. */ | |
|
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1123 e->flags |= EDGE_FALLTHRU; |
| 0 | 1124 |
|
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1125 /* Remove the remaining outgoing edges. */ |
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1126 for (ei = ei_start (bb->succs); (e2 = ei_safe_edge (ei)); ) |
|
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1127 if (e != e2) |
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1128 { |
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1129 cfg_altered = true; |
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|
1130 remove_edge (e2); |
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1131 } |
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1132 else |
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1133 ei_next (&ei); |
| 0 | 1134 } |
|
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1135 |
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|
1136 unlink_stmt_vdef (stmt); |
|
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1137 gsi_remove (i, true); |
|
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1138 release_defs (stmt); |
| 0 | 1139 } |
| 1140 | |
| 1141 /* Eliminate unnecessary statements. Any instruction not marked as necessary | |
| 1142 contributes nothing to the program, and can be deleted. */ | |
| 1143 | |
| 1144 static bool | |
| 1145 eliminate_unnecessary_stmts (void) | |
| 1146 { | |
| 1147 bool something_changed = false; | |
| 1148 basic_block bb; | |
|
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1149 gimple_stmt_iterator gsi, psi; |
| 0 | 1150 gimple stmt; |
| 1151 tree call; | |
|
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1152 VEC (basic_block, heap) *h; |
| 0 | 1153 |
| 1154 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1155 fprintf (dump_file, "\nEliminating unnecessary statements:\n"); | |
| 1156 | |
| 1157 clear_special_calls (); | |
|
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1158 |
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1159 /* Walking basic blocks and statements in reverse order avoids |
|
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1160 releasing SSA names before any other DEFs that refer to them are |
|
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1161 released. This helps avoid loss of debug information, as we get |
|
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1162 a chance to propagate all RHSs of removed SSAs into debug uses, |
|
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1163 rather than only the latest ones. E.g., consider: |
|
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1164 |
|
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1165 x_3 = y_1 + z_2; |
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1166 a_5 = x_3 - b_4; |
|
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1167 # DEBUG a => a_5 |
|
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1168 |
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1169 If we were to release x_3 before a_5, when we reached a_5 and |
|
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|
1170 tried to substitute it into the debug stmt, we'd see x_3 there, |
|
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1171 but x_3's DEF, type, etc would have already been disconnected. |
|
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1172 By going backwards, the debug stmt first changes to: |
|
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1173 |
|
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|
1174 # DEBUG a => x_3 - b_4 |
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1175 |
|
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1176 and then to: |
|
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1177 |
|
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1178 # DEBUG a => y_1 + z_2 - b_4 |
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1179 |
|
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1180 as desired. */ |
|
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|
1181 gcc_assert (dom_info_available_p (CDI_DOMINATORS)); |
|
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|
1182 h = get_all_dominated_blocks (CDI_DOMINATORS, single_succ (ENTRY_BLOCK_PTR)); |
|
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|
1183 |
|
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|
1184 while (VEC_length (basic_block, h)) |
| 0 | 1185 { |
|
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|
1186 bb = VEC_pop (basic_block, h); |
| 0 | 1187 |
| 1188 /* Remove dead statements. */ | |
|
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|
1189 for (gsi = gsi_last_bb (bb); !gsi_end_p (gsi); gsi = psi) |
| 0 | 1190 { |
| 1191 stmt = gsi_stmt (gsi); | |
| 1192 | |
|
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|
1193 psi = gsi; |
|
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|
1194 gsi_prev (&psi); |
|
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|
1195 |
| 0 | 1196 stats.total++; |
| 1197 | |
| 1198 /* If GSI is not necessary then remove it. */ | |
| 1199 if (!gimple_plf (stmt, STMT_NECESSARY)) | |
| 1200 { | |
|
55
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|
1201 if (!is_gimple_debug (stmt)) |
|
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|
1202 something_changed = true; |
| 0 | 1203 remove_dead_stmt (&gsi, bb); |
| 1204 } | |
| 1205 else if (is_gimple_call (stmt)) | |
| 1206 { | |
| 1207 call = gimple_call_fndecl (stmt); | |
| 1208 if (call) | |
| 1209 { | |
| 1210 tree name; | |
| 1211 | |
| 1212 /* When LHS of var = call (); is dead, simplify it into | |
| 1213 call (); saving one operand. */ | |
| 1214 name = gimple_call_lhs (stmt); | |
| 1215 if (name && TREE_CODE (name) == SSA_NAME | |
| 1216 && !TEST_BIT (processed, SSA_NAME_VERSION (name))) | |
| 1217 { | |
| 1218 something_changed = true; | |
| 1219 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1220 { | |
| 1221 fprintf (dump_file, "Deleting LHS of call: "); | |
| 1222 print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
| 1223 fprintf (dump_file, "\n"); | |
| 1224 } | |
|
55
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diff
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|
1225 |
|
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diff
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|
1226 gimple_call_set_lhs (stmt, NULL_TREE); |
|
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diff
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|
1227 maybe_clean_or_replace_eh_stmt (stmt, stmt); |
|
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|
1228 update_stmt (stmt); |
| 0 | 1229 release_ssa_name (name); |
| 1230 } | |
| 1231 notice_special_calls (stmt); | |
| 1232 } | |
| 1233 } | |
| 1234 } | |
| 1235 } | |
| 1236 | |
|
55
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diff
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|
1237 VEC_free (basic_block, heap, h); |
|
77e2b8dfacca
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|
1238 |
|
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diff
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|
1239 /* Since we don't track liveness of virtual PHI nodes, it is possible that we |
|
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diff
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|
1240 rendered some PHI nodes unreachable while they are still in use. |
|
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|
1241 Mark them for renaming. */ |
|
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diff
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|
1242 if (cfg_altered) |
|
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|
1243 { |
|
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|
1244 basic_block prev_bb; |
|
77e2b8dfacca
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|
1245 |
|
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|
1246 find_unreachable_blocks (); |
|
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diff
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|
1247 |
|
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|
1248 /* Delete all unreachable basic blocks in reverse dominator order. */ |
|
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diff
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|
1249 for (bb = EXIT_BLOCK_PTR->prev_bb; bb != ENTRY_BLOCK_PTR; bb = prev_bb) |
|
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|
1250 { |
|
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|
1251 prev_bb = bb->prev_bb; |
|
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|
1252 |
|
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|
1253 if (!TEST_BIT (bb_contains_live_stmts, bb->index) |
|
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|
1254 || !(bb->flags & BB_REACHABLE)) |
|
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|
1255 { |
|
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|
1256 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
|
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|
1257 if (!is_gimple_reg (gimple_phi_result (gsi_stmt (gsi)))) |
|
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|
1258 { |
|
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|
1259 bool found = false; |
|
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|
1260 imm_use_iterator iter; |
|
77e2b8dfacca
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|
1261 |
|
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|
1262 FOR_EACH_IMM_USE_STMT (stmt, iter, gimple_phi_result (gsi_stmt (gsi))) |
|
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|
1263 { |
|
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|
1264 if (!(gimple_bb (stmt)->flags & BB_REACHABLE)) |
|
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|
1265 continue; |
|
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|
1266 if (gimple_code (stmt) == GIMPLE_PHI |
|
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|
1267 || gimple_plf (stmt, STMT_NECESSARY)) |
|
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|
1268 { |
|
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|
1269 found = true; |
|
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|
1270 BREAK_FROM_IMM_USE_STMT (iter); |
|
77e2b8dfacca
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|
1271 } |
|
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|
1272 } |
|
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|
1273 if (found) |
|
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|
1274 mark_virtual_phi_result_for_renaming (gsi_stmt (gsi)); |
|
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|
1275 } |
|
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|
1276 |
|
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|
1277 if (!(bb->flags & BB_REACHABLE)) |
|
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|
1278 { |
|
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|
1279 /* Speed up the removal of blocks that don't |
|
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|
1280 dominate others. Walking backwards, this should |
|
77e2b8dfacca
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|
1281 be the common case. ??? Do we need to recompute |
|
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|
1282 dominators because of cfg_altered? */ |
|
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|
1283 if (!MAY_HAVE_DEBUG_STMTS |
|
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|
1284 || !first_dom_son (CDI_DOMINATORS, bb)) |
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1285 delete_basic_block (bb); |
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1286 else |
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1287 { |
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1288 h = get_all_dominated_blocks (CDI_DOMINATORS, bb); |
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1289 |
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1290 while (VEC_length (basic_block, h)) |
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1291 { |
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1292 bb = VEC_pop (basic_block, h); |
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1293 prev_bb = bb->prev_bb; |
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1294 /* Rearrangements to the CFG may have failed |
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1295 to update the dominators tree, so that |
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1296 formerly-dominated blocks are now |
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1297 otherwise reachable. */ |
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1298 if (!!(bb->flags & BB_REACHABLE)) |
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1299 continue; |
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1300 delete_basic_block (bb); |
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1301 } |
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1302 |
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1303 VEC_free (basic_block, heap, h); |
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1304 } |
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1305 } |
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1306 } |
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1307 } |
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1308 } |
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1309 FOR_EACH_BB (bb) |
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1310 { |
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1311 /* Remove dead PHI nodes. */ |
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1312 something_changed |= remove_dead_phis (bb); |
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1313 } |
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1314 |
| 0 | 1315 return something_changed; |
| 1316 } | |
| 1317 | |
| 1318 | |
| 1319 /* Print out removed statement statistics. */ | |
| 1320 | |
| 1321 static void | |
| 1322 print_stats (void) | |
| 1323 { | |
| 1324 float percg; | |
| 1325 | |
| 1326 percg = ((float) stats.removed / (float) stats.total) * 100; | |
| 1327 fprintf (dump_file, "Removed %d of %d statements (%d%%)\n", | |
| 1328 stats.removed, stats.total, (int) percg); | |
| 1329 | |
| 1330 if (stats.total_phis == 0) | |
| 1331 percg = 0; | |
| 1332 else | |
| 1333 percg = ((float) stats.removed_phis / (float) stats.total_phis) * 100; | |
| 1334 | |
| 1335 fprintf (dump_file, "Removed %d of %d PHI nodes (%d%%)\n", | |
| 1336 stats.removed_phis, stats.total_phis, (int) percg); | |
| 1337 } | |
| 1338 | |
| 1339 /* Initialization for this pass. Set up the used data structures. */ | |
| 1340 | |
| 1341 static void | |
| 1342 tree_dce_init (bool aggressive) | |
| 1343 { | |
| 1344 memset ((void *) &stats, 0, sizeof (stats)); | |
| 1345 | |
| 1346 if (aggressive) | |
| 1347 { | |
| 1348 int i; | |
| 1349 | |
| 1350 control_dependence_map = XNEWVEC (bitmap, last_basic_block); | |
| 1351 for (i = 0; i < last_basic_block; ++i) | |
| 1352 control_dependence_map[i] = BITMAP_ALLOC (NULL); | |
| 1353 | |
| 1354 last_stmt_necessary = sbitmap_alloc (last_basic_block); | |
| 1355 sbitmap_zero (last_stmt_necessary); | |
|
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1356 bb_contains_live_stmts = sbitmap_alloc (last_basic_block); |
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1357 sbitmap_zero (bb_contains_live_stmts); |
| 0 | 1358 } |
| 1359 | |
| 1360 processed = sbitmap_alloc (num_ssa_names + 1); | |
| 1361 sbitmap_zero (processed); | |
| 1362 | |
| 1363 worklist = VEC_alloc (gimple, heap, 64); | |
| 1364 cfg_altered = false; | |
| 1365 } | |
| 1366 | |
| 1367 /* Cleanup after this pass. */ | |
| 1368 | |
| 1369 static void | |
| 1370 tree_dce_done (bool aggressive) | |
| 1371 { | |
| 1372 if (aggressive) | |
| 1373 { | |
| 1374 int i; | |
| 1375 | |
| 1376 for (i = 0; i < last_basic_block; ++i) | |
| 1377 BITMAP_FREE (control_dependence_map[i]); | |
| 1378 free (control_dependence_map); | |
| 1379 | |
| 1380 sbitmap_free (visited_control_parents); | |
| 1381 sbitmap_free (last_stmt_necessary); | |
|
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1382 sbitmap_free (bb_contains_live_stmts); |
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1383 bb_contains_live_stmts = NULL; |
| 0 | 1384 } |
| 1385 | |
| 1386 sbitmap_free (processed); | |
| 1387 | |
| 1388 VEC_free (gimple, heap, worklist); | |
| 1389 } | |
| 1390 | |
| 1391 /* Main routine to eliminate dead code. | |
| 1392 | |
| 1393 AGGRESSIVE controls the aggressiveness of the algorithm. | |
| 1394 In conservative mode, we ignore control dependence and simply declare | |
| 1395 all but the most trivially dead branches necessary. This mode is fast. | |
| 1396 In aggressive mode, control dependences are taken into account, which | |
| 1397 results in more dead code elimination, but at the cost of some time. | |
| 1398 | |
| 1399 FIXME: Aggressive mode before PRE doesn't work currently because | |
| 1400 the dominance info is not invalidated after DCE1. This is | |
| 1401 not an issue right now because we only run aggressive DCE | |
| 1402 as the last tree SSA pass, but keep this in mind when you | |
| 1403 start experimenting with pass ordering. */ | |
| 1404 | |
| 1405 static unsigned int | |
| 1406 perform_tree_ssa_dce (bool aggressive) | |
| 1407 { | |
| 1408 struct edge_list *el = NULL; | |
| 1409 bool something_changed = 0; | |
| 1410 | |
|
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1411 calculate_dominance_info (CDI_DOMINATORS); |
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1412 |
|
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1413 /* Preheaders are needed for SCEV to work. |
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1414 Simple lateches and recorded exits improve chances that loop will |
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1415 proved to be finite in testcases such as in loop-15.c and loop-24.c */ |
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1416 if (aggressive) |
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1417 loop_optimizer_init (LOOPS_NORMAL |
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1418 | LOOPS_HAVE_RECORDED_EXITS); |
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1419 |
| 0 | 1420 tree_dce_init (aggressive); |
| 1421 | |
| 1422 if (aggressive) | |
| 1423 { | |
| 1424 /* Compute control dependence. */ | |
| 1425 timevar_push (TV_CONTROL_DEPENDENCES); | |
| 1426 calculate_dominance_info (CDI_POST_DOMINATORS); | |
| 1427 el = create_edge_list (); | |
| 1428 find_all_control_dependences (el); | |
| 1429 timevar_pop (TV_CONTROL_DEPENDENCES); | |
| 1430 | |
| 1431 visited_control_parents = sbitmap_alloc (last_basic_block); | |
| 1432 sbitmap_zero (visited_control_parents); | |
| 1433 | |
| 1434 mark_dfs_back_edges (); | |
| 1435 } | |
| 1436 | |
| 1437 find_obviously_necessary_stmts (el); | |
| 1438 | |
|
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1439 if (aggressive) |
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1440 loop_optimizer_finalize (); |
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1441 |
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1442 longest_chain = 0; |
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1443 total_chain = 0; |
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1444 nr_walks = 0; |
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1445 chain_ovfl = false; |
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1446 visited = BITMAP_ALLOC (NULL); |
| 0 | 1447 propagate_necessity (el); |
|
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1448 BITMAP_FREE (visited); |
| 0 | 1449 |
| 1450 something_changed |= eliminate_unnecessary_stmts (); | |
| 1451 something_changed |= cfg_altered; | |
| 1452 | |
| 1453 /* We do not update postdominators, so free them unconditionally. */ | |
| 1454 free_dominance_info (CDI_POST_DOMINATORS); | |
| 1455 | |
| 1456 /* If we removed paths in the CFG, then we need to update | |
| 1457 dominators as well. I haven't investigated the possibility | |
| 1458 of incrementally updating dominators. */ | |
| 1459 if (cfg_altered) | |
| 1460 free_dominance_info (CDI_DOMINATORS); | |
| 1461 | |
| 1462 statistics_counter_event (cfun, "Statements deleted", stats.removed); | |
| 1463 statistics_counter_event (cfun, "PHI nodes deleted", stats.removed_phis); | |
| 1464 | |
| 1465 /* Debugging dumps. */ | |
| 1466 if (dump_file && (dump_flags & (TDF_STATS|TDF_DETAILS))) | |
| 1467 print_stats (); | |
| 1468 | |
| 1469 tree_dce_done (aggressive); | |
| 1470 | |
| 1471 free_edge_list (el); | |
| 1472 | |
| 1473 if (something_changed) | |
|
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1474 return (TODO_update_ssa | TODO_cleanup_cfg | TODO_ggc_collect |
| 0 | 1475 | TODO_remove_unused_locals); |
| 1476 else | |
| 1477 return 0; | |
| 1478 } | |
| 1479 | |
| 1480 /* Pass entry points. */ | |
| 1481 static unsigned int | |
| 1482 tree_ssa_dce (void) | |
| 1483 { | |
| 1484 return perform_tree_ssa_dce (/*aggressive=*/false); | |
| 1485 } | |
| 1486 | |
| 1487 static unsigned int | |
| 1488 tree_ssa_dce_loop (void) | |
| 1489 { | |
| 1490 unsigned int todo; | |
| 1491 todo = perform_tree_ssa_dce (/*aggressive=*/false); | |
| 1492 if (todo) | |
| 1493 { | |
| 1494 free_numbers_of_iterations_estimates (); | |
| 1495 scev_reset (); | |
| 1496 } | |
| 1497 return todo; | |
| 1498 } | |
| 1499 | |
| 1500 static unsigned int | |
| 1501 tree_ssa_cd_dce (void) | |
| 1502 { | |
| 1503 return perform_tree_ssa_dce (/*aggressive=*/optimize >= 2); | |
| 1504 } | |
| 1505 | |
| 1506 static bool | |
| 1507 gate_dce (void) | |
| 1508 { | |
| 1509 return flag_tree_dce != 0; | |
| 1510 } | |
| 1511 | |
| 1512 struct gimple_opt_pass pass_dce = | |
| 1513 { | |
| 1514 { | |
| 1515 GIMPLE_PASS, | |
| 1516 "dce", /* name */ | |
| 1517 gate_dce, /* gate */ | |
| 1518 tree_ssa_dce, /* execute */ | |
| 1519 NULL, /* sub */ | |
| 1520 NULL, /* next */ | |
| 1521 0, /* static_pass_number */ | |
| 1522 TV_TREE_DCE, /* tv_id */ | |
| 1523 PROP_cfg | PROP_ssa, /* properties_required */ | |
| 1524 0, /* properties_provided */ | |
| 1525 0, /* properties_destroyed */ | |
| 1526 0, /* todo_flags_start */ | |
| 1527 TODO_dump_func | TODO_verify_ssa /* todo_flags_finish */ | |
| 1528 } | |
| 1529 }; | |
| 1530 | |
| 1531 struct gimple_opt_pass pass_dce_loop = | |
| 1532 { | |
| 1533 { | |
| 1534 GIMPLE_PASS, | |
| 1535 "dceloop", /* name */ | |
| 1536 gate_dce, /* gate */ | |
| 1537 tree_ssa_dce_loop, /* execute */ | |
| 1538 NULL, /* sub */ | |
| 1539 NULL, /* next */ | |
| 1540 0, /* static_pass_number */ | |
| 1541 TV_TREE_DCE, /* tv_id */ | |
| 1542 PROP_cfg | PROP_ssa, /* properties_required */ | |
| 1543 0, /* properties_provided */ | |
| 1544 0, /* properties_destroyed */ | |
| 1545 0, /* todo_flags_start */ | |
| 1546 TODO_dump_func | TODO_verify_ssa /* todo_flags_finish */ | |
| 1547 } | |
| 1548 }; | |
| 1549 | |
| 1550 struct gimple_opt_pass pass_cd_dce = | |
| 1551 { | |
| 1552 { | |
| 1553 GIMPLE_PASS, | |
| 1554 "cddce", /* name */ | |
| 1555 gate_dce, /* gate */ | |
| 1556 tree_ssa_cd_dce, /* execute */ | |
| 1557 NULL, /* sub */ | |
| 1558 NULL, /* next */ | |
| 1559 0, /* static_pass_number */ | |
| 1560 TV_TREE_CD_DCE, /* tv_id */ | |
| 1561 PROP_cfg | PROP_ssa, /* properties_required */ | |
| 1562 0, /* properties_provided */ | |
| 1563 0, /* properties_destroyed */ | |
| 1564 0, /* todo_flags_start */ | |
| 1565 TODO_dump_func | TODO_verify_ssa | |
| 1566 | TODO_verify_flow /* todo_flags_finish */ | |
| 1567 } | |
| 1568 }; |