Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-dce.c @ 55:77e2b8dfacca gcc-4.4.5
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| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* Dead code elimination pass for the GNU compiler. |
|
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2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
| 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 #include "ggc.h" | |
| 51 | |
| 52 /* These RTL headers are needed for basic-block.h. */ | |
| 53 #include "rtl.h" | |
| 54 #include "tm_p.h" | |
| 55 #include "hard-reg-set.h" | |
| 56 #include "obstack.h" | |
| 57 #include "basic-block.h" | |
| 58 | |
| 59 #include "tree.h" | |
| 60 #include "diagnostic.h" | |
| 61 #include "tree-flow.h" | |
| 62 #include "gimple.h" | |
| 63 #include "tree-dump.h" | |
| 64 #include "tree-pass.h" | |
| 65 #include "timevar.h" | |
| 66 #include "flags.h" | |
| 67 #include "cfgloop.h" | |
| 68 #include "tree-scalar-evolution.h" | |
| 69 | |
| 70 static struct stmt_stats | |
| 71 { | |
| 72 int total; | |
| 73 int total_phis; | |
| 74 int removed; | |
| 75 int removed_phis; | |
| 76 } stats; | |
| 77 | |
| 78 #define STMT_NECESSARY GF_PLF_1 | |
| 79 | |
| 80 static VEC(gimple,heap) *worklist; | |
| 81 | |
| 82 /* Vector indicating an SSA name has already been processed and marked | |
| 83 as necessary. */ | |
| 84 static sbitmap processed; | |
| 85 | |
| 86 /* Vector indicating that last_stmt if a basic block has already been | |
| 87 marked as necessary. */ | |
| 88 static sbitmap last_stmt_necessary; | |
| 89 | |
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90 /* Vector indicating that BB contains statements that are live. */ |
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91 static sbitmap bb_contains_live_stmts; |
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92 |
| 0 | 93 /* Before we can determine whether a control branch is dead, we need to |
| 94 compute which blocks are control dependent on which edges. | |
| 95 | |
| 96 We expect each block to be control dependent on very few edges so we | |
| 97 use a bitmap for each block recording its edges. An array holds the | |
| 98 bitmap. The Ith bit in the bitmap is set if that block is dependent | |
| 99 on the Ith edge. */ | |
| 100 static bitmap *control_dependence_map; | |
| 101 | |
| 102 /* Vector indicating that a basic block has already had all the edges | |
| 103 processed that it is control dependent on. */ | |
| 104 static sbitmap visited_control_parents; | |
| 105 | |
| 106 /* TRUE if this pass alters the CFG (by removing control statements). | |
| 107 FALSE otherwise. | |
| 108 | |
| 109 If this pass alters the CFG, then it will arrange for the dominators | |
| 110 to be recomputed. */ | |
| 111 static bool cfg_altered; | |
| 112 | |
| 113 /* Execute code that follows the macro for each edge (given number | |
| 114 EDGE_NUMBER within the CODE) for which the block with index N is | |
| 115 control dependent. */ | |
| 116 #define EXECUTE_IF_CONTROL_DEPENDENT(BI, N, EDGE_NUMBER) \ | |
| 117 EXECUTE_IF_SET_IN_BITMAP (control_dependence_map[(N)], 0, \ | |
| 118 (EDGE_NUMBER), (BI)) | |
| 119 | |
| 120 | |
| 121 /* Indicate block BB is control dependent on an edge with index EDGE_INDEX. */ | |
| 122 static inline void | |
| 123 set_control_dependence_map_bit (basic_block bb, int edge_index) | |
| 124 { | |
| 125 if (bb == ENTRY_BLOCK_PTR) | |
| 126 return; | |
| 127 gcc_assert (bb != EXIT_BLOCK_PTR); | |
| 128 bitmap_set_bit (control_dependence_map[bb->index], edge_index); | |
| 129 } | |
| 130 | |
| 131 /* Clear all control dependences for block BB. */ | |
| 132 static inline void | |
| 133 clear_control_dependence_bitmap (basic_block bb) | |
| 134 { | |
| 135 bitmap_clear (control_dependence_map[bb->index]); | |
| 136 } | |
| 137 | |
| 138 | |
| 139 /* Find the immediate postdominator PDOM of the specified basic block BLOCK. | |
| 140 This function is necessary because some blocks have negative numbers. */ | |
| 141 | |
| 142 static inline basic_block | |
| 143 find_pdom (basic_block block) | |
| 144 { | |
| 145 gcc_assert (block != ENTRY_BLOCK_PTR); | |
| 146 | |
| 147 if (block == EXIT_BLOCK_PTR) | |
| 148 return EXIT_BLOCK_PTR; | |
| 149 else | |
| 150 { | |
| 151 basic_block bb = get_immediate_dominator (CDI_POST_DOMINATORS, block); | |
| 152 if (! bb) | |
| 153 return EXIT_BLOCK_PTR; | |
| 154 return bb; | |
| 155 } | |
| 156 } | |
| 157 | |
| 158 | |
| 159 /* Determine all blocks' control dependences on the given edge with edge_list | |
| 160 EL index EDGE_INDEX, ala Morgan, Section 3.6. */ | |
| 161 | |
| 162 static void | |
| 163 find_control_dependence (struct edge_list *el, int edge_index) | |
| 164 { | |
| 165 basic_block current_block; | |
| 166 basic_block ending_block; | |
| 167 | |
| 168 gcc_assert (INDEX_EDGE_PRED_BB (el, edge_index) != EXIT_BLOCK_PTR); | |
| 169 | |
| 170 if (INDEX_EDGE_PRED_BB (el, edge_index) == ENTRY_BLOCK_PTR) | |
| 171 ending_block = single_succ (ENTRY_BLOCK_PTR); | |
| 172 else | |
| 173 ending_block = find_pdom (INDEX_EDGE_PRED_BB (el, edge_index)); | |
| 174 | |
| 175 for (current_block = INDEX_EDGE_SUCC_BB (el, edge_index); | |
| 176 current_block != ending_block && current_block != EXIT_BLOCK_PTR; | |
| 177 current_block = find_pdom (current_block)) | |
| 178 { | |
| 179 edge e = INDEX_EDGE (el, edge_index); | |
| 180 | |
| 181 /* For abnormal edges, we don't make current_block control | |
| 182 dependent because instructions that throw are always necessary | |
| 183 anyway. */ | |
| 184 if (e->flags & EDGE_ABNORMAL) | |
| 185 continue; | |
| 186 | |
| 187 set_control_dependence_map_bit (current_block, edge_index); | |
| 188 } | |
| 189 } | |
| 190 | |
| 191 | |
| 192 /* Record all blocks' control dependences on all edges in the edge | |
| 193 list EL, ala Morgan, Section 3.6. */ | |
| 194 | |
| 195 static void | |
| 196 find_all_control_dependences (struct edge_list *el) | |
| 197 { | |
| 198 int i; | |
| 199 | |
| 200 for (i = 0; i < NUM_EDGES (el); ++i) | |
| 201 find_control_dependence (el, i); | |
| 202 } | |
| 203 | |
| 204 /* If STMT is not already marked necessary, mark it, and add it to the | |
| 205 worklist if ADD_TO_WORKLIST is true. */ | |
| 206 static inline void | |
| 207 mark_stmt_necessary (gimple stmt, bool add_to_worklist) | |
| 208 { | |
| 209 gcc_assert (stmt); | |
| 210 | |
| 211 if (gimple_plf (stmt, STMT_NECESSARY)) | |
| 212 return; | |
| 213 | |
| 214 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 215 { | |
| 216 fprintf (dump_file, "Marking useful stmt: "); | |
| 217 print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
| 218 fprintf (dump_file, "\n"); | |
| 219 } | |
| 220 | |
| 221 gimple_set_plf (stmt, STMT_NECESSARY, true); | |
| 222 if (add_to_worklist) | |
| 223 VEC_safe_push (gimple, heap, worklist, stmt); | |
|
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224 if (bb_contains_live_stmts && !is_gimple_debug (stmt)) |
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225 SET_BIT (bb_contains_live_stmts, gimple_bb (stmt)->index); |
| 0 | 226 } |
| 227 | |
| 228 | |
| 229 /* Mark the statement defining operand OP as necessary. */ | |
| 230 | |
| 231 static inline void | |
| 232 mark_operand_necessary (tree op) | |
| 233 { | |
| 234 gimple stmt; | |
| 235 int ver; | |
| 236 | |
| 237 gcc_assert (op); | |
| 238 | |
| 239 ver = SSA_NAME_VERSION (op); | |
| 240 if (TEST_BIT (processed, ver)) | |
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241 { |
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242 stmt = SSA_NAME_DEF_STMT (op); |
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243 gcc_assert (gimple_nop_p (stmt) |
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244 || gimple_plf (stmt, STMT_NECESSARY)); |
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245 return; |
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246 } |
| 0 | 247 SET_BIT (processed, ver); |
| 248 | |
| 249 stmt = SSA_NAME_DEF_STMT (op); | |
| 250 gcc_assert (stmt); | |
| 251 | |
| 252 if (gimple_plf (stmt, STMT_NECESSARY) || gimple_nop_p (stmt)) | |
| 253 return; | |
| 254 | |
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255 if (dump_file && (dump_flags & TDF_DETAILS)) |
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256 { |
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257 fprintf (dump_file, "marking necessary through "); |
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258 print_generic_expr (dump_file, op, 0); |
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259 fprintf (dump_file, " stmt "); |
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260 print_gimple_stmt (dump_file, stmt, 0, 0); |
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261 } |
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262 |
| 0 | 263 gimple_set_plf (stmt, STMT_NECESSARY, true); |
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264 if (bb_contains_live_stmts) |
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265 SET_BIT (bb_contains_live_stmts, gimple_bb (stmt)->index); |
| 0 | 266 VEC_safe_push (gimple, heap, worklist, stmt); |
| 267 } | |
| 268 | |
| 269 | |
| 270 /* Mark STMT as necessary if it obviously is. Add it to the worklist if | |
| 271 it can make other statements necessary. | |
| 272 | |
| 273 If AGGRESSIVE is false, control statements are conservatively marked as | |
| 274 necessary. */ | |
| 275 | |
| 276 static void | |
| 277 mark_stmt_if_obviously_necessary (gimple stmt, bool aggressive) | |
| 278 { | |
| 279 tree lhs = NULL_TREE; | |
| 280 /* With non-call exceptions, we have to assume that all statements could | |
| 281 throw. If a statement may throw, it is inherently necessary. */ | |
| 282 if (flag_non_call_exceptions | |
| 283 && stmt_could_throw_p (stmt)) | |
| 284 { | |
| 285 mark_stmt_necessary (stmt, true); | |
| 286 return; | |
| 287 } | |
| 288 | |
| 289 /* Statements that are implicitly live. Most function calls, asm | |
| 290 and return statements are required. Labels and GIMPLE_BIND nodes | |
| 291 are kept because they are control flow, and we have no way of | |
| 292 knowing whether they can be removed. DCE can eliminate all the | |
| 293 other statements in a block, and CFG can then remove the block | |
| 294 and labels. */ | |
| 295 switch (gimple_code (stmt)) | |
| 296 { | |
| 297 case GIMPLE_PREDICT: | |
| 298 case GIMPLE_LABEL: | |
| 299 mark_stmt_necessary (stmt, false); | |
| 300 return; | |
| 301 | |
| 302 case GIMPLE_ASM: | |
| 303 case GIMPLE_RESX: | |
| 304 case GIMPLE_RETURN: | |
| 305 mark_stmt_necessary (stmt, true); | |
| 306 return; | |
| 307 | |
| 308 case GIMPLE_CALL: | |
| 309 /* Most, but not all function calls are required. Function calls that | |
| 310 produce no result and have no side effects (i.e. const pure | |
| 311 functions) are unnecessary. */ | |
| 312 if (gimple_has_side_effects (stmt)) | |
| 313 { | |
| 314 mark_stmt_necessary (stmt, true); | |
| 315 return; | |
| 316 } | |
| 317 if (!gimple_call_lhs (stmt)) | |
| 318 return; | |
| 319 lhs = gimple_call_lhs (stmt); | |
| 320 /* Fall through */ | |
| 321 | |
| 322 case GIMPLE_ASSIGN: | |
| 323 if (!lhs) | |
| 324 lhs = gimple_assign_lhs (stmt); | |
| 325 break; | |
| 326 | |
|
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327 case GIMPLE_DEBUG: |
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328 /* Debug temps without a value are not useful. ??? If we could |
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329 easily locate the debug temp bind stmt for a use thereof, |
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330 would could refrain from marking all debug temps here, and |
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331 mark them only if they're used. */ |
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332 if (gimple_debug_bind_has_value_p (stmt) |
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333 || TREE_CODE (gimple_debug_bind_get_var (stmt)) != DEBUG_EXPR_DECL) |
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334 mark_stmt_necessary (stmt, false); |
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335 return; |
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336 |
| 0 | 337 case GIMPLE_GOTO: |
| 338 gcc_assert (!simple_goto_p (stmt)); | |
| 339 mark_stmt_necessary (stmt, true); | |
| 340 return; | |
| 341 | |
| 342 case GIMPLE_COND: | |
| 343 gcc_assert (EDGE_COUNT (gimple_bb (stmt)->succs) == 2); | |
| 344 /* Fall through. */ | |
| 345 | |
| 346 case GIMPLE_SWITCH: | |
| 347 if (! aggressive) | |
| 348 mark_stmt_necessary (stmt, true); | |
| 349 break; | |
| 350 | |
| 351 default: | |
| 352 break; | |
| 353 } | |
| 354 | |
| 355 /* If the statement has volatile operands, it needs to be preserved. | |
| 356 Same for statements that can alter control flow in unpredictable | |
| 357 ways. */ | |
| 358 if (gimple_has_volatile_ops (stmt) || is_ctrl_altering_stmt (stmt)) | |
| 359 { | |
| 360 mark_stmt_necessary (stmt, true); | |
| 361 return; | |
| 362 } | |
| 363 | |
| 364 if (is_hidden_global_store (stmt)) | |
| 365 { | |
| 366 mark_stmt_necessary (stmt, true); | |
| 367 return; | |
| 368 } | |
| 369 | |
| 370 return; | |
| 371 } | |
| 372 | |
| 373 | |
| 374 /* Make corresponding control dependent edges necessary. We only | |
| 375 have to do this once for each basic block, so we clear the bitmap | |
| 376 after we're done. */ | |
| 377 static void | |
| 378 mark_control_dependent_edges_necessary (basic_block bb, struct edge_list *el) | |
| 379 { | |
| 380 bitmap_iterator bi; | |
| 381 unsigned edge_number; | |
| 382 | |
| 383 gcc_assert (bb != EXIT_BLOCK_PTR); | |
| 384 | |
| 385 if (bb == ENTRY_BLOCK_PTR) | |
| 386 return; | |
| 387 | |
| 388 EXECUTE_IF_CONTROL_DEPENDENT (bi, bb->index, edge_number) | |
| 389 { | |
| 390 gimple stmt; | |
| 391 basic_block cd_bb = INDEX_EDGE_PRED_BB (el, edge_number); | |
| 392 | |
| 393 if (TEST_BIT (last_stmt_necessary, cd_bb->index)) | |
| 394 continue; | |
| 395 SET_BIT (last_stmt_necessary, cd_bb->index); | |
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396 SET_BIT (bb_contains_live_stmts, cd_bb->index); |
| 0 | 397 |
| 398 stmt = last_stmt (cd_bb); | |
| 399 if (stmt && is_ctrl_stmt (stmt)) | |
| 400 mark_stmt_necessary (stmt, true); | |
| 401 } | |
| 402 } | |
| 403 | |
| 404 | |
| 405 /* Find obviously necessary statements. These are things like most function | |
| 406 calls, and stores to file level variables. | |
| 407 | |
| 408 If EL is NULL, control statements are conservatively marked as | |
| 409 necessary. Otherwise it contains the list of edges used by control | |
| 410 dependence analysis. */ | |
| 411 | |
| 412 static void | |
| 413 find_obviously_necessary_stmts (struct edge_list *el) | |
| 414 { | |
| 415 basic_block bb; | |
| 416 gimple_stmt_iterator gsi; | |
| 417 edge e; | |
| 418 gimple phi, stmt; | |
| 419 | |
| 420 FOR_EACH_BB (bb) | |
| 421 { | |
| 422 /* PHI nodes are never inherently necessary. */ | |
| 423 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 424 { | |
| 425 phi = gsi_stmt (gsi); | |
| 426 gimple_set_plf (phi, STMT_NECESSARY, false); | |
| 427 } | |
| 428 | |
| 429 /* Check all statements in the block. */ | |
| 430 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 431 { | |
| 432 stmt = gsi_stmt (gsi); | |
| 433 gimple_set_plf (stmt, STMT_NECESSARY, false); | |
| 434 mark_stmt_if_obviously_necessary (stmt, el != NULL); | |
| 435 } | |
| 436 } | |
| 437 | |
|
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438 /* Pure and const functions are finite and thus have no infinite loops in |
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439 them. */ |
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440 if ((TREE_READONLY (current_function_decl) |
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441 || DECL_PURE_P (current_function_decl)) |
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442 && !DECL_LOOPING_CONST_OR_PURE_P (current_function_decl)) |
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443 return; |
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444 |
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445 /* Prevent the empty possibly infinite loops from being removed. */ |
| 0 | 446 if (el) |
| 447 { | |
|
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448 loop_iterator li; |
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449 struct loop *loop; |
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450 scev_initialize (); |
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451 if (mark_irreducible_loops ()) |
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452 FOR_EACH_BB (bb) |
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453 { |
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454 edge_iterator ei; |
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455 FOR_EACH_EDGE (e, ei, bb->succs) |
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456 if ((e->flags & EDGE_DFS_BACK) |
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457 && (e->flags & EDGE_IRREDUCIBLE_LOOP)) |
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458 { |
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459 if (dump_file) |
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460 fprintf (dump_file, "Marking back edge of irreducible loop %i->%i\n", |
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461 e->src->index, e->dest->index); |
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462 mark_control_dependent_edges_necessary (e->dest, el); |
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463 } |
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464 } |
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465 |
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466 FOR_EACH_LOOP (li, loop, 0) |
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467 if (!finite_loop_p (loop)) |
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468 { |
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469 if (dump_file) |
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470 fprintf (dump_file, "can not prove finiteness of loop %i\n", loop->num); |
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471 mark_control_dependent_edges_necessary (loop->latch, el); |
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472 } |
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473 scev_finalize (); |
| 0 | 474 } |
| 475 } | |
| 476 | |
| 477 | |
|
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478 /* Return true if REF is based on an aliased base, otherwise false. */ |
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479 |
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480 static bool |
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481 ref_may_be_aliased (tree ref) |
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482 { |
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483 while (handled_component_p (ref)) |
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484 ref = TREE_OPERAND (ref, 0); |
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485 return !(DECL_P (ref) |
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486 && !may_be_aliased (ref)); |
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487 } |
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488 |
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489 static bitmap visited = NULL; |
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490 static unsigned int longest_chain = 0; |
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491 static unsigned int total_chain = 0; |
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492 static unsigned int nr_walks = 0; |
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493 static bool chain_ovfl = false; |
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494 |
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495 /* Worker for the walker that marks reaching definitions of REF, |
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496 which is based on a non-aliased decl, necessary. It returns |
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497 true whenever the defining statement of the current VDEF is |
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498 a kill for REF, as no dominating may-defs are necessary for REF |
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499 anymore. DATA points to the basic-block that contains the |
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500 stmt that refers to REF. */ |
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501 |
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502 static bool |
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503 mark_aliased_reaching_defs_necessary_1 (ao_ref *ref, tree vdef, void *data) |
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504 { |
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505 gimple def_stmt = SSA_NAME_DEF_STMT (vdef); |
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506 |
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507 /* All stmts we visit are necessary. */ |
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508 mark_operand_necessary (vdef); |
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509 |
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510 /* If the stmt lhs kills ref, then we can stop walking. */ |
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511 if (gimple_has_lhs (def_stmt) |
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512 && TREE_CODE (gimple_get_lhs (def_stmt)) != SSA_NAME) |
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513 { |
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514 tree base, lhs = gimple_get_lhs (def_stmt); |
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515 HOST_WIDE_INT size, offset, max_size; |
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516 ao_ref_base (ref); |
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517 base = get_ref_base_and_extent (lhs, &offset, &size, &max_size); |
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518 /* We can get MEM[symbol: sZ, index: D.8862_1] here, |
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519 so base == refd->base does not always hold. */ |
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520 if (base == ref->base) |
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521 { |
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522 /* For a must-alias check we need to be able to constrain |
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523 the accesses properly. */ |
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524 if (size != -1 && size == max_size |
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525 && ref->max_size != -1) |
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526 { |
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527 if (offset <= ref->offset |
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528 && offset + size >= ref->offset + ref->max_size) |
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529 return true; |
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530 } |
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531 /* Or they need to be exactly the same. */ |
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532 else if (ref->ref |
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533 /* Make sure there is no induction variable involved |
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534 in the references (gcc.c-torture/execute/pr42142.c). |
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535 The simplest way is to check if the kill dominates |
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536 the use. */ |
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537 && dominated_by_p (CDI_DOMINATORS, (basic_block) data, |
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538 gimple_bb (def_stmt)) |
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539 && operand_equal_p (ref->ref, lhs, 0)) |
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540 return true; |
|
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541 } |
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542 } |
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543 |
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544 /* Otherwise keep walking. */ |
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545 return false; |
|
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546 } |
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547 |
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548 static void |
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549 mark_aliased_reaching_defs_necessary (gimple stmt, tree ref) |
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550 { |
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551 unsigned int chain; |
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552 ao_ref refd; |
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553 gcc_assert (!chain_ovfl); |
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554 ao_ref_init (&refd, ref); |
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555 chain = walk_aliased_vdefs (&refd, gimple_vuse (stmt), |
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556 mark_aliased_reaching_defs_necessary_1, |
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557 gimple_bb (stmt), NULL); |
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558 if (chain > longest_chain) |
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559 longest_chain = chain; |
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560 total_chain += chain; |
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561 nr_walks++; |
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562 } |
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563 |
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564 /* Worker for the walker that marks reaching definitions of REF, which |
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565 is not based on a non-aliased decl. For simplicity we need to end |
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566 up marking all may-defs necessary that are not based on a non-aliased |
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567 decl. The only job of this walker is to skip may-defs based on |
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568 a non-aliased decl. */ |
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569 |
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570 static bool |
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571 mark_all_reaching_defs_necessary_1 (ao_ref *ref ATTRIBUTE_UNUSED, |
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572 tree vdef, void *data ATTRIBUTE_UNUSED) |
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573 { |
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574 gimple def_stmt = SSA_NAME_DEF_STMT (vdef); |
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575 |
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576 /* We have to skip already visited (and thus necessary) statements |
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577 to make the chaining work after we dropped back to simple mode. */ |
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578 if (chain_ovfl |
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579 && TEST_BIT (processed, SSA_NAME_VERSION (vdef))) |
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580 { |
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581 gcc_assert (gimple_nop_p (def_stmt) |
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582 || gimple_plf (def_stmt, STMT_NECESSARY)); |
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583 return false; |
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584 } |
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585 |
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586 /* We want to skip stores to non-aliased variables. */ |
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587 if (!chain_ovfl |
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588 && gimple_assign_single_p (def_stmt)) |
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589 { |
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590 tree lhs = gimple_assign_lhs (def_stmt); |
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591 if (!ref_may_be_aliased (lhs)) |
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592 return false; |
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593 } |
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594 |
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595 mark_operand_necessary (vdef); |
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596 |
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597 return false; |
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598 } |
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599 |
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600 static void |
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601 mark_all_reaching_defs_necessary (gimple stmt) |
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602 { |
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603 walk_aliased_vdefs (NULL, gimple_vuse (stmt), |
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604 mark_all_reaching_defs_necessary_1, NULL, &visited); |
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605 } |
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606 |
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607 /* Return true for PHI nodes with one or identical arguments |
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608 can be removed. */ |
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609 static bool |
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610 degenerate_phi_p (gimple phi) |
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611 { |
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612 unsigned int i; |
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613 tree op = gimple_phi_arg_def (phi, 0); |
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614 for (i = 1; i < gimple_phi_num_args (phi); i++) |
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615 if (gimple_phi_arg_def (phi, i) != op) |
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616 return false; |
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617 return true; |
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618 } |
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619 |
| 0 | 620 /* Propagate necessity using the operands of necessary statements. |
| 621 Process the uses on each statement in the worklist, and add all | |
| 622 feeding statements which contribute to the calculation of this | |
|
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623 value to the worklist. |
| 0 | 624 |
| 625 In conservative mode, EL is NULL. */ | |
| 626 | |
| 627 static void | |
| 628 propagate_necessity (struct edge_list *el) | |
| 629 { | |
| 630 gimple stmt; | |
|
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631 bool aggressive = (el ? true : false); |
| 0 | 632 |
| 633 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 634 fprintf (dump_file, "\nProcessing worklist:\n"); | |
| 635 | |
| 636 while (VEC_length (gimple, worklist) > 0) | |
| 637 { | |
| 638 /* Take STMT from worklist. */ | |
| 639 stmt = VEC_pop (gimple, worklist); | |
| 640 | |
| 641 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 642 { | |
| 643 fprintf (dump_file, "processing: "); | |
| 644 print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
| 645 fprintf (dump_file, "\n"); | |
| 646 } | |
| 647 | |
| 648 if (aggressive) | |
| 649 { | |
| 650 /* Mark the last statements of the basic blocks that the block | |
| 651 containing STMT is control dependent on, but only if we haven't | |
| 652 already done so. */ | |
| 653 basic_block bb = gimple_bb (stmt); | |
| 654 if (bb != ENTRY_BLOCK_PTR | |
| 655 && ! TEST_BIT (visited_control_parents, bb->index)) | |
| 656 { | |
| 657 SET_BIT (visited_control_parents, bb->index); | |
| 658 mark_control_dependent_edges_necessary (bb, el); | |
| 659 } | |
| 660 } | |
| 661 | |
|
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662 if (gimple_code (stmt) == GIMPLE_PHI |
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663 /* We do not process virtual PHI nodes nor do we track their |
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664 necessity. */ |
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665 && is_gimple_reg (gimple_phi_result (stmt))) |
| 0 | 666 { |
| 667 /* PHI nodes are somewhat special in that each PHI alternative has | |
| 668 data and control dependencies. All the statements feeding the | |
| 669 PHI node's arguments are always necessary. In aggressive mode, | |
| 670 we also consider the control dependent edges leading to the | |
| 671 predecessor block associated with each PHI alternative as | |
| 672 necessary. */ | |
| 673 size_t k; | |
| 674 | |
| 675 for (k = 0; k < gimple_phi_num_args (stmt); k++) | |
| 676 { | |
| 677 tree arg = PHI_ARG_DEF (stmt, k); | |
| 678 if (TREE_CODE (arg) == SSA_NAME) | |
| 679 mark_operand_necessary (arg); | |
| 680 } | |
| 681 | |
|
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682 if (aggressive && !degenerate_phi_p (stmt)) |
| 0 | 683 { |
| 684 for (k = 0; k < gimple_phi_num_args (stmt); k++) | |
| 685 { | |
| 686 basic_block arg_bb = gimple_phi_arg_edge (stmt, k)->src; | |
| 687 if (arg_bb != ENTRY_BLOCK_PTR | |
| 688 && ! TEST_BIT (visited_control_parents, arg_bb->index)) | |
| 689 { | |
| 690 SET_BIT (visited_control_parents, arg_bb->index); | |
| 691 mark_control_dependent_edges_necessary (arg_bb, el); | |
| 692 } | |
| 693 } | |
| 694 } | |
| 695 } | |
| 696 else | |
| 697 { | |
| 698 /* Propagate through the operands. Examine all the USE, VUSE and | |
|
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699 VDEF operands in this statement. Mark all the statements |
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changeset
|
700 which feed this statement's uses as necessary. */ |
| 0 | 701 ssa_op_iter iter; |
| 702 tree use; | |
| 703 | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
704 FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_USE) |
| 0 | 705 mark_operand_necessary (use); |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
706 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
707 use = 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
|
708 if (!use) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
709 continue; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
710 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
711 /* If we dropped to simple mode make all immediately |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
712 reachable definitions necessary. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
713 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
|
714 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
715 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
|
716 continue; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
717 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
718 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
719 /* For statements that may load from memory (have a VUSE) we |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
720 have to mark all reaching (may-)definitions as necessary. |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
721 We partition this task into two cases: |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
722 1) explicit loads based on decls that are not aliased |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
723 2) implicit loads (like calls) and explicit loads not |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
724 based on decls that are not aliased (like indirect |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
725 references or loads from globals) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
726 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
|
727 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
|
728 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
|
729 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
|
730 we walk for 2) we avoid quadratic behavior for those. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
731 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
732 if (is_gimple_call (stmt)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
733 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
734 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
|
735 unsigned i; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
736 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
737 /* 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
|
738 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
|
739 stores necessary. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
740 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
|
741 && 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
|
742 && (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
|
743 || DECL_FUNCTION_CODE (callee) == BUILT_IN_MALLOC |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
744 || 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
|
745 continue; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
746 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
747 /* 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
|
748 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
|
749 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
|
750 for (i = 0; i < gimple_call_num_args (stmt); ++i) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
751 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
752 tree arg = gimple_call_arg (stmt, i); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
753 if (TREE_CODE (arg) == SSA_NAME |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
754 || 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
|
755 continue; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
756 if (!ref_may_be_aliased (arg)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
757 mark_aliased_reaching_defs_necessary (stmt, arg); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
758 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
759 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
760 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
|
761 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
762 tree rhs; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
763 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
|
764 /* 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
|
765 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
|
766 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
|
767 && !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
|
768 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
769 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
|
770 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
|
771 else |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
772 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
|
773 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
774 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
|
775 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
|
776 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
777 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
|
778 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
779 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
|
780 /* 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
|
781 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
|
782 && !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
|
783 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
784 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
|
785 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
|
786 else |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
787 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
|
788 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
789 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
790 else if (gimple_code (stmt) == GIMPLE_ASM) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
791 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
792 unsigned i; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
793 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
|
794 /* Inputs may perform loads. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
795 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
|
796 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
797 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
|
798 if (TREE_CODE (op) != SSA_NAME |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
799 && !is_gimple_min_invariant (op) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
800 && !ref_may_be_aliased (op)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
801 mark_aliased_reaching_defs_necessary (stmt, op); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
802 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
803 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
804 else |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
805 gcc_unreachable (); |
|
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|
806 |
|
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|
807 /* If we over-used our alias oracle budget drop to simple |
|
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|
808 mode. The cost metric allows quadratic behavior |
|
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809 (number of uses times number of may-defs queries) up to |
|
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diff
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|
810 a constant maximal number of queries and after that falls back to |
|
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|
811 super-linear complexity. */ |
|
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parents:
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|
812 if (/* Constant but quadratic for small functions. */ |
|
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|
813 total_chain > 128 * 128 |
|
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|
814 /* Linear in the number of may-defs. */ |
|
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|
815 && total_chain > 32 * longest_chain |
|
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816 /* Linear in the number of uses. */ |
|
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|
817 && total_chain > nr_walks * 32) |
|
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|
818 { |
|
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819 chain_ovfl = true; |
|
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|
820 if (visited) |
|
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|
821 bitmap_clear (visited); |
|
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822 } |
| 0 | 823 } |
| 824 } | |
| 825 } | |
| 826 | |
|
55
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827 /* Replace all uses of result of PHI by underlying variable and mark it |
|
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828 for renaming. */ |
|
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829 |
|
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|
830 void |
|
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|
831 mark_virtual_phi_result_for_renaming (gimple phi) |
|
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832 { |
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833 bool used = false; |
|
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834 imm_use_iterator iter; |
|
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835 use_operand_p use_p; |
|
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|
836 gimple stmt; |
|
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837 tree result_ssa, result_var; |
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838 |
|
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|
839 if (dump_file && (dump_flags & TDF_DETAILS)) |
|
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840 { |
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841 fprintf (dump_file, "Marking result for renaming : "); |
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|
842 print_gimple_stmt (dump_file, phi, 0, TDF_SLIM); |
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843 fprintf (dump_file, "\n"); |
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844 } |
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|
845 |
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|
846 result_ssa = gimple_phi_result (phi); |
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847 result_var = SSA_NAME_VAR (result_ssa); |
|
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848 FOR_EACH_IMM_USE_STMT (stmt, iter, result_ssa) |
|
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849 { |
|
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850 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
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851 SET_USE (use_p, result_var); |
|
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852 update_stmt (stmt); |
|
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853 used = true; |
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854 } |
|
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855 if (used) |
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|
856 mark_sym_for_renaming (result_var); |
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|
857 } |
| 0 | 858 |
| 859 /* Remove dead PHI nodes from block BB. */ | |
| 860 | |
| 861 static bool | |
| 862 remove_dead_phis (basic_block bb) | |
| 863 { | |
| 864 bool something_changed = false; | |
| 865 gimple_seq phis; | |
| 866 gimple phi; | |
| 867 gimple_stmt_iterator gsi; | |
| 868 phis = phi_nodes (bb); | |
| 869 | |
| 870 for (gsi = gsi_start (phis); !gsi_end_p (gsi);) | |
| 871 { | |
| 872 stats.total_phis++; | |
| 873 phi = gsi_stmt (gsi); | |
| 874 | |
|
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875 /* We do not track necessity of virtual PHI nodes. Instead do |
|
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876 very simple dead PHI removal here. */ |
|
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|
877 if (!is_gimple_reg (gimple_phi_result (phi))) |
|
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|
878 { |
|
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|
879 /* Virtual PHI nodes with one or identical arguments |
|
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parents:
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|
880 can be removed. */ |
|
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|
881 if (degenerate_phi_p (phi)) |
|
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|
882 { |
|
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|
883 tree vdef = gimple_phi_result (phi); |
|
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|
884 tree vuse = gimple_phi_arg_def (phi, 0); |
|
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|
885 |
|
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|
886 use_operand_p use_p; |
|
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|
887 imm_use_iterator iter; |
|
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|
888 gimple use_stmt; |
|
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|
889 FOR_EACH_IMM_USE_STMT (use_stmt, iter, vdef) |
|
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|
890 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) |
|
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|
891 SET_USE (use_p, vuse); |
|
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|
892 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vdef) |
|
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|
893 && TREE_CODE (vuse) == SSA_NAME) |
|
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|
894 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (vuse) = 1; |
|
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|
895 } |
|
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|
896 else |
|
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|
897 gimple_set_plf (phi, STMT_NECESSARY, true); |
|
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|
898 } |
|
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|
899 |
| 0 | 900 if (!gimple_plf (phi, STMT_NECESSARY)) |
| 901 { | |
| 902 something_changed = true; | |
| 903 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 904 { | |
| 905 fprintf (dump_file, "Deleting : "); | |
| 906 print_gimple_stmt (dump_file, phi, 0, TDF_SLIM); | |
| 907 fprintf (dump_file, "\n"); | |
| 908 } | |
| 909 | |
| 910 remove_phi_node (&gsi, true); | |
| 911 stats.removed_phis++; | |
|
55
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|
912 continue; |
| 0 | 913 } |
|
55
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|
914 |
|
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|
915 gsi_next (&gsi); |
| 0 | 916 } |
| 917 return something_changed; | |
| 918 } | |
| 919 | |
|
55
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|
920 /* Find first live post dominator of BB. */ |
|
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|
921 |
|
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|
922 static basic_block |
|
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|
923 get_live_post_dom (basic_block bb) |
|
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|
924 { |
|
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|
925 basic_block post_dom_bb; |
|
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|
926 |
|
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|
927 |
|
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|
928 /* The post dominance info has to be up-to-date. */ |
|
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|
929 gcc_assert (dom_info_state (CDI_POST_DOMINATORS) == DOM_OK); |
|
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|
930 |
|
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|
931 /* Get the immediate post dominator of bb. */ |
|
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|
932 post_dom_bb = get_immediate_dominator (CDI_POST_DOMINATORS, bb); |
|
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|
933 /* And look for first live one. */ |
|
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|
934 while (post_dom_bb != EXIT_BLOCK_PTR |
|
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|
935 && !TEST_BIT (bb_contains_live_stmts, post_dom_bb->index)) |
|
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|
936 post_dom_bb = get_immediate_dominator (CDI_POST_DOMINATORS, post_dom_bb); |
|
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|
937 |
|
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|
938 return post_dom_bb; |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
939 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
940 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
941 /* Forward edge E to respective POST_DOM_BB and update PHIs. */ |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
942 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
943 static edge |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
944 forward_edge_to_pdom (edge e, basic_block post_dom_bb) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
945 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
946 gimple_stmt_iterator gsi; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
947 edge e2 = NULL; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
948 edge_iterator ei; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
949 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
950 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
|
951 fprintf (dump_file, "Redirecting edge %i->%i to %i\n", e->src->index, |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
952 e->dest->index, post_dom_bb->index); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
953 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
954 e2 = redirect_edge_and_branch (e, post_dom_bb); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
955 cfg_altered = true; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
956 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
957 /* If edge was already around, no updating is neccesary. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
958 if (e2 != e) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
959 return e2; |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
960 |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
961 if (phi_nodes (post_dom_bb)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
962 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
963 /* We are sure that for every live PHI we are seeing control dependent BB. |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
964 This means that we can look up the end of control dependent path leading |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
965 to the PHI itself. */ |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
966 FOR_EACH_EDGE (e2, ei, post_dom_bb->preds) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
967 if (e2 != e && dominated_by_p (CDI_POST_DOMINATORS, e->src, e2->src)) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
968 break; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
969 for (gsi = gsi_start_phis (post_dom_bb); !gsi_end_p (gsi);) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
970 { |
|
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
971 gimple phi = gsi_stmt (gsi); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
972 tree op; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
973 source_location locus; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
974 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
975 /* Dead PHI do not imply control dependency. */ |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
976 if (!gimple_plf (phi, STMT_NECESSARY) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
977 && is_gimple_reg (gimple_phi_result (phi))) |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
978 { |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
979 gsi_next (&gsi); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
980 continue; |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
981 } |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
982 if (gimple_phi_arg_def (phi, e->dest_idx)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
983 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
984 gsi_next (&gsi); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
985 continue; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
986 } |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
987 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
988 /* We didn't find edge to update. This can happen for PHIs on virtuals |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
989 since there is no control dependency relation on them. We are lost |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
990 here and must force renaming of the symbol. */ |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
991 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
|
992 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
993 mark_virtual_phi_result_for_renaming (phi); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
994 remove_phi_node (&gsi, true); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
995 continue; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
996 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
997 if (!e2) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
998 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
999 op = gimple_phi_arg_def (phi, e->dest_idx == 0 ? 1 : 0); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1000 locus = gimple_phi_arg_location (phi, e->dest_idx == 0 ? 1 : 0); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1001 } |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
1002 else |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
1003 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1004 op = gimple_phi_arg_def (phi, e2->dest_idx); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1005 locus = gimple_phi_arg_location (phi, e2->dest_idx); |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
1006 } |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
1007 add_phi_arg (phi, op, e, locus); |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
1008 gcc_assert (e2 || degenerate_phi_p (phi)); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1009 gsi_next (&gsi); |
|
77e2b8dfacca
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parents:
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diff
changeset
|
1010 } |
|
77e2b8dfacca
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parents:
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diff
changeset
|
1011 } |
|
77e2b8dfacca
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parents:
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changeset
|
1012 return e; |
|
77e2b8dfacca
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parents:
0
diff
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|
1013 } |
| 0 | 1014 |
| 1015 /* Remove dead statement pointed to by iterator I. Receives the basic block BB | |
| 1016 containing I so that we don't have to look it up. */ | |
| 1017 | |
| 1018 static void | |
| 1019 remove_dead_stmt (gimple_stmt_iterator *i, basic_block bb) | |
| 1020 { | |
| 1021 gimple stmt = gsi_stmt (*i); | |
| 1022 | |
| 1023 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1024 { | |
| 1025 fprintf (dump_file, "Deleting : "); | |
| 1026 print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
| 1027 fprintf (dump_file, "\n"); | |
| 1028 } | |
| 1029 | |
| 1030 stats.removed++; | |
| 1031 | |
| 1032 /* If we have determined that a conditional branch statement contributes | |
| 1033 nothing to the program, then we not only remove it, but we also change | |
| 1034 the flow graph so that the current block will simply fall-thru to its | |
| 1035 immediate post-dominator. The blocks we are circumventing will be | |
| 1036 removed by cleanup_tree_cfg if this change in the flow graph makes them | |
| 1037 unreachable. */ | |
| 1038 if (is_ctrl_stmt (stmt)) | |
| 1039 { | |
| 1040 basic_block post_dom_bb; | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
1041 edge e, e2; |
|
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update it from 4.4.3 to 4.5.0
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parents:
0
diff
changeset
|
1042 edge_iterator ei; |
| 0 | 1043 |
|
55
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parents:
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|
1044 post_dom_bb = get_live_post_dom (bb); |
| 0 | 1045 |
|
55
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parents:
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changeset
|
1046 e = find_edge (bb, post_dom_bb); |
| 0 | 1047 |
|
55
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1048 /* If edge is already there, try to use it. This avoids need to update |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1049 PHI nodes. Also watch for cases where post dominator does not exists |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1050 or is exit block. These can happen for infinite loops as we create |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1051 fake edges in the dominator tree. */ |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
1052 if (e) |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
1053 ; |
|
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parents:
0
diff
changeset
|
1054 else if (! post_dom_bb || post_dom_bb == EXIT_BLOCK_PTR) |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1055 e = EDGE_SUCC (bb, 0); |
| 0 | 1056 else |
|
55
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1057 e = forward_edge_to_pdom (EDGE_SUCC (bb, 0), post_dom_bb); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1058 gcc_assert (e); |
|
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1059 e->probability = REG_BR_PROB_BASE; |
|
77e2b8dfacca
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parents:
0
diff
changeset
|
1060 e->count = bb->count; |
| 0 | 1061 |
| 1062 /* The edge is no longer associated with a conditional, so it does | |
| 1063 not have TRUE/FALSE flags. */ | |
|
55
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1064 e->flags &= ~(EDGE_TRUE_VALUE | EDGE_FALSE_VALUE); |
| 0 | 1065 |
| 1066 /* The lone outgoing edge from BB will be a fallthru edge. */ | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1067 e->flags |= EDGE_FALLTHRU; |
| 0 | 1068 |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
1069 /* Remove the remaining outgoing edges. */ |
|
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1070 for (ei = ei_start (bb->succs); (e2 = ei_safe_edge (ei)); ) |
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1071 if (e != e2) |
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1072 { |
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1073 cfg_altered = true; |
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1074 remove_edge (e2); |
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1075 } |
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1076 else |
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1077 ei_next (&ei); |
| 0 | 1078 } |
|
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1079 |
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1080 unlink_stmt_vdef (stmt); |
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1081 gsi_remove (i, true); |
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1082 release_defs (stmt); |
| 0 | 1083 } |
| 1084 | |
| 1085 /* Eliminate unnecessary statements. Any instruction not marked as necessary | |
| 1086 contributes nothing to the program, and can be deleted. */ | |
| 1087 | |
| 1088 static bool | |
| 1089 eliminate_unnecessary_stmts (void) | |
| 1090 { | |
| 1091 bool something_changed = false; | |
| 1092 basic_block bb; | |
|
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1093 gimple_stmt_iterator gsi, psi; |
| 0 | 1094 gimple stmt; |
| 1095 tree call; | |
|
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1096 VEC (basic_block, heap) *h; |
| 0 | 1097 |
| 1098 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1099 fprintf (dump_file, "\nEliminating unnecessary statements:\n"); | |
| 1100 | |
| 1101 clear_special_calls (); | |
|
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1102 |
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1103 /* Walking basic blocks and statements in reverse order avoids |
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1104 releasing SSA names before any other DEFs that refer to them are |
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1105 released. This helps avoid loss of debug information, as we get |
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1106 a chance to propagate all RHSs of removed SSAs into debug uses, |
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1107 rather than only the latest ones. E.g., consider: |
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1108 |
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1109 x_3 = y_1 + z_2; |
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1110 a_5 = x_3 - b_4; |
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1111 # DEBUG a => a_5 |
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1112 |
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1113 If we were to release x_3 before a_5, when we reached a_5 and |
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1114 tried to substitute it into the debug stmt, we'd see x_3 there, |
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1115 but x_3's DEF, type, etc would have already been disconnected. |
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1116 By going backwards, the debug stmt first changes to: |
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1117 |
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1118 # DEBUG a => x_3 - b_4 |
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1119 |
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1120 and then to: |
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1121 |
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1122 # DEBUG a => y_1 + z_2 - b_4 |
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1123 |
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1124 as desired. */ |
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1125 gcc_assert (dom_info_available_p (CDI_DOMINATORS)); |
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1126 h = get_all_dominated_blocks (CDI_DOMINATORS, single_succ (ENTRY_BLOCK_PTR)); |
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1127 |
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1128 while (VEC_length (basic_block, h)) |
| 0 | 1129 { |
|
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1130 bb = VEC_pop (basic_block, h); |
| 0 | 1131 |
| 1132 /* Remove dead statements. */ | |
|
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1133 for (gsi = gsi_last_bb (bb); !gsi_end_p (gsi); gsi = psi) |
| 0 | 1134 { |
| 1135 stmt = gsi_stmt (gsi); | |
| 1136 | |
|
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1137 psi = gsi; |
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1138 gsi_prev (&psi); |
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1139 |
| 0 | 1140 stats.total++; |
| 1141 | |
| 1142 /* If GSI is not necessary then remove it. */ | |
| 1143 if (!gimple_plf (stmt, STMT_NECESSARY)) | |
| 1144 { | |
|
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1145 if (!is_gimple_debug (stmt)) |
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1146 something_changed = true; |
| 0 | 1147 remove_dead_stmt (&gsi, bb); |
| 1148 } | |
| 1149 else if (is_gimple_call (stmt)) | |
| 1150 { | |
| 1151 call = gimple_call_fndecl (stmt); | |
| 1152 if (call) | |
| 1153 { | |
| 1154 tree name; | |
| 1155 | |
| 1156 /* When LHS of var = call (); is dead, simplify it into | |
| 1157 call (); saving one operand. */ | |
| 1158 name = gimple_call_lhs (stmt); | |
| 1159 if (name && TREE_CODE (name) == SSA_NAME | |
| 1160 && !TEST_BIT (processed, SSA_NAME_VERSION (name))) | |
| 1161 { | |
| 1162 something_changed = true; | |
| 1163 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1164 { | |
| 1165 fprintf (dump_file, "Deleting LHS of call: "); | |
| 1166 print_gimple_stmt (dump_file, stmt, 0, TDF_SLIM); | |
| 1167 fprintf (dump_file, "\n"); | |
| 1168 } | |
|
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1169 |
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1170 gimple_call_set_lhs (stmt, NULL_TREE); |
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1171 maybe_clean_or_replace_eh_stmt (stmt, stmt); |
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1172 update_stmt (stmt); |
| 0 | 1173 release_ssa_name (name); |
| 1174 } | |
| 1175 notice_special_calls (stmt); | |
| 1176 } | |
| 1177 } | |
| 1178 } | |
| 1179 } | |
| 1180 | |
|
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1181 VEC_free (basic_block, heap, h); |
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1182 |
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1183 /* Since we don't track liveness of virtual PHI nodes, it is possible that we |
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1184 rendered some PHI nodes unreachable while they are still in use. |
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1185 Mark them for renaming. */ |
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1186 if (cfg_altered) |
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1187 { |
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1188 basic_block prev_bb; |
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1189 |
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1190 find_unreachable_blocks (); |
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1191 |
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1192 /* Delete all unreachable basic blocks in reverse dominator order. */ |
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1193 for (bb = EXIT_BLOCK_PTR->prev_bb; bb != ENTRY_BLOCK_PTR; bb = prev_bb) |
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1194 { |
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1195 prev_bb = bb->prev_bb; |
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1196 |
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1197 if (!TEST_BIT (bb_contains_live_stmts, bb->index) |
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1198 || !(bb->flags & BB_REACHABLE)) |
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1199 { |
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1200 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
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1201 if (!is_gimple_reg (gimple_phi_result (gsi_stmt (gsi)))) |
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1202 { |
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1203 bool found = false; |
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1204 imm_use_iterator iter; |
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1205 |
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1206 FOR_EACH_IMM_USE_STMT (stmt, iter, gimple_phi_result (gsi_stmt (gsi))) |
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1207 { |
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1208 if (!(gimple_bb (stmt)->flags & BB_REACHABLE)) |
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1209 continue; |
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1210 if (gimple_code (stmt) == GIMPLE_PHI |
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1211 || gimple_plf (stmt, STMT_NECESSARY)) |
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1212 { |
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1213 found = true; |
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1214 BREAK_FROM_IMM_USE_STMT (iter); |
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1215 } |
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1216 } |
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1217 if (found) |
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1218 mark_virtual_phi_result_for_renaming (gsi_stmt (gsi)); |
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1219 } |
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1220 |
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1221 if (!(bb->flags & BB_REACHABLE)) |
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1222 { |
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1223 /* Speed up the removal of blocks that don't |
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1224 dominate others. Walking backwards, this should |
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1225 be the common case. ??? Do we need to recompute |
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1226 dominators because of cfg_altered? */ |
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1227 if (!MAY_HAVE_DEBUG_STMTS |
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1228 || !first_dom_son (CDI_DOMINATORS, bb)) |
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1229 delete_basic_block (bb); |
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1230 else |
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1231 { |
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1232 h = get_all_dominated_blocks (CDI_DOMINATORS, bb); |
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1233 |
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1234 while (VEC_length (basic_block, h)) |
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1235 { |
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1236 bb = VEC_pop (basic_block, h); |
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1237 prev_bb = bb->prev_bb; |
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1238 /* Rearrangements to the CFG may have failed |
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1239 to update the dominators tree, so that |
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1240 formerly-dominated blocks are now |
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1241 otherwise reachable. */ |
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1242 if (!!(bb->flags & BB_REACHABLE)) |
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1243 continue; |
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1244 delete_basic_block (bb); |
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1245 } |
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1246 |
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1247 VEC_free (basic_block, heap, h); |
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1248 } |
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1249 } |
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1250 } |
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1251 } |
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1252 } |
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1253 FOR_EACH_BB (bb) |
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1254 { |
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1255 /* Remove dead PHI nodes. */ |
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1256 something_changed |= remove_dead_phis (bb); |
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1257 } |
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1258 |
| 0 | 1259 return something_changed; |
| 1260 } | |
| 1261 | |
| 1262 | |
| 1263 /* Print out removed statement statistics. */ | |
| 1264 | |
| 1265 static void | |
| 1266 print_stats (void) | |
| 1267 { | |
| 1268 float percg; | |
| 1269 | |
| 1270 percg = ((float) stats.removed / (float) stats.total) * 100; | |
| 1271 fprintf (dump_file, "Removed %d of %d statements (%d%%)\n", | |
| 1272 stats.removed, stats.total, (int) percg); | |
| 1273 | |
| 1274 if (stats.total_phis == 0) | |
| 1275 percg = 0; | |
| 1276 else | |
| 1277 percg = ((float) stats.removed_phis / (float) stats.total_phis) * 100; | |
| 1278 | |
| 1279 fprintf (dump_file, "Removed %d of %d PHI nodes (%d%%)\n", | |
| 1280 stats.removed_phis, stats.total_phis, (int) percg); | |
| 1281 } | |
| 1282 | |
| 1283 /* Initialization for this pass. Set up the used data structures. */ | |
| 1284 | |
| 1285 static void | |
| 1286 tree_dce_init (bool aggressive) | |
| 1287 { | |
| 1288 memset ((void *) &stats, 0, sizeof (stats)); | |
| 1289 | |
| 1290 if (aggressive) | |
| 1291 { | |
| 1292 int i; | |
| 1293 | |
| 1294 control_dependence_map = XNEWVEC (bitmap, last_basic_block); | |
| 1295 for (i = 0; i < last_basic_block; ++i) | |
| 1296 control_dependence_map[i] = BITMAP_ALLOC (NULL); | |
| 1297 | |
| 1298 last_stmt_necessary = sbitmap_alloc (last_basic_block); | |
| 1299 sbitmap_zero (last_stmt_necessary); | |
|
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1300 bb_contains_live_stmts = sbitmap_alloc (last_basic_block); |
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1301 sbitmap_zero (bb_contains_live_stmts); |
| 0 | 1302 } |
| 1303 | |
| 1304 processed = sbitmap_alloc (num_ssa_names + 1); | |
| 1305 sbitmap_zero (processed); | |
| 1306 | |
| 1307 worklist = VEC_alloc (gimple, heap, 64); | |
| 1308 cfg_altered = false; | |
| 1309 } | |
| 1310 | |
| 1311 /* Cleanup after this pass. */ | |
| 1312 | |
| 1313 static void | |
| 1314 tree_dce_done (bool aggressive) | |
| 1315 { | |
| 1316 if (aggressive) | |
| 1317 { | |
| 1318 int i; | |
| 1319 | |
| 1320 for (i = 0; i < last_basic_block; ++i) | |
| 1321 BITMAP_FREE (control_dependence_map[i]); | |
| 1322 free (control_dependence_map); | |
| 1323 | |
| 1324 sbitmap_free (visited_control_parents); | |
| 1325 sbitmap_free (last_stmt_necessary); | |
|
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1326 sbitmap_free (bb_contains_live_stmts); |
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1327 bb_contains_live_stmts = NULL; |
| 0 | 1328 } |
| 1329 | |
| 1330 sbitmap_free (processed); | |
| 1331 | |
| 1332 VEC_free (gimple, heap, worklist); | |
| 1333 } | |
| 1334 | |
| 1335 /* Main routine to eliminate dead code. | |
| 1336 | |
| 1337 AGGRESSIVE controls the aggressiveness of the algorithm. | |
| 1338 In conservative mode, we ignore control dependence and simply declare | |
| 1339 all but the most trivially dead branches necessary. This mode is fast. | |
| 1340 In aggressive mode, control dependences are taken into account, which | |
| 1341 results in more dead code elimination, but at the cost of some time. | |
| 1342 | |
| 1343 FIXME: Aggressive mode before PRE doesn't work currently because | |
| 1344 the dominance info is not invalidated after DCE1. This is | |
| 1345 not an issue right now because we only run aggressive DCE | |
| 1346 as the last tree SSA pass, but keep this in mind when you | |
| 1347 start experimenting with pass ordering. */ | |
| 1348 | |
| 1349 static unsigned int | |
| 1350 perform_tree_ssa_dce (bool aggressive) | |
| 1351 { | |
| 1352 struct edge_list *el = NULL; | |
| 1353 bool something_changed = 0; | |
| 1354 | |
|
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1355 /* Preheaders are needed for SCEV to work. |
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1356 Simple lateches and recorded exits improve chances that loop will |
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1357 proved to be finite in testcases such as in loop-15.c and loop-24.c */ |
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1358 if (aggressive) |
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1359 loop_optimizer_init (LOOPS_NORMAL |
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1360 | LOOPS_HAVE_RECORDED_EXITS); |
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1361 |
| 0 | 1362 tree_dce_init (aggressive); |
| 1363 | |
| 1364 if (aggressive) | |
| 1365 { | |
| 1366 /* Compute control dependence. */ | |
| 1367 timevar_push (TV_CONTROL_DEPENDENCES); | |
| 1368 calculate_dominance_info (CDI_POST_DOMINATORS); | |
| 1369 el = create_edge_list (); | |
| 1370 find_all_control_dependences (el); | |
| 1371 timevar_pop (TV_CONTROL_DEPENDENCES); | |
| 1372 | |
| 1373 visited_control_parents = sbitmap_alloc (last_basic_block); | |
| 1374 sbitmap_zero (visited_control_parents); | |
| 1375 | |
| 1376 mark_dfs_back_edges (); | |
| 1377 } | |
| 1378 | |
| 1379 find_obviously_necessary_stmts (el); | |
| 1380 | |
|
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1381 if (aggressive) |
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1382 loop_optimizer_finalize (); |
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1383 |
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1384 longest_chain = 0; |
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1385 total_chain = 0; |
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1386 nr_walks = 0; |
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1387 chain_ovfl = false; |
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1388 visited = BITMAP_ALLOC (NULL); |
| 0 | 1389 propagate_necessity (el); |
|
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1390 BITMAP_FREE (visited); |
| 0 | 1391 |
| 1392 something_changed |= eliminate_unnecessary_stmts (); | |
| 1393 something_changed |= cfg_altered; | |
| 1394 | |
| 1395 /* We do not update postdominators, so free them unconditionally. */ | |
| 1396 free_dominance_info (CDI_POST_DOMINATORS); | |
| 1397 | |
| 1398 /* If we removed paths in the CFG, then we need to update | |
| 1399 dominators as well. I haven't investigated the possibility | |
| 1400 of incrementally updating dominators. */ | |
| 1401 if (cfg_altered) | |
| 1402 free_dominance_info (CDI_DOMINATORS); | |
| 1403 | |
| 1404 statistics_counter_event (cfun, "Statements deleted", stats.removed); | |
| 1405 statistics_counter_event (cfun, "PHI nodes deleted", stats.removed_phis); | |
| 1406 | |
| 1407 /* Debugging dumps. */ | |
| 1408 if (dump_file && (dump_flags & (TDF_STATS|TDF_DETAILS))) | |
| 1409 print_stats (); | |
| 1410 | |
| 1411 tree_dce_done (aggressive); | |
| 1412 | |
| 1413 free_edge_list (el); | |
| 1414 | |
| 1415 if (something_changed) | |
|
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1416 return (TODO_update_ssa | TODO_cleanup_cfg | TODO_ggc_collect |
| 0 | 1417 | TODO_remove_unused_locals); |
| 1418 else | |
| 1419 return 0; | |
| 1420 } | |
| 1421 | |
| 1422 /* Pass entry points. */ | |
| 1423 static unsigned int | |
| 1424 tree_ssa_dce (void) | |
| 1425 { | |
| 1426 return perform_tree_ssa_dce (/*aggressive=*/false); | |
| 1427 } | |
| 1428 | |
| 1429 static unsigned int | |
| 1430 tree_ssa_dce_loop (void) | |
| 1431 { | |
| 1432 unsigned int todo; | |
| 1433 todo = perform_tree_ssa_dce (/*aggressive=*/false); | |
| 1434 if (todo) | |
| 1435 { | |
| 1436 free_numbers_of_iterations_estimates (); | |
| 1437 scev_reset (); | |
| 1438 } | |
| 1439 return todo; | |
| 1440 } | |
| 1441 | |
| 1442 static unsigned int | |
| 1443 tree_ssa_cd_dce (void) | |
| 1444 { | |
| 1445 return perform_tree_ssa_dce (/*aggressive=*/optimize >= 2); | |
| 1446 } | |
| 1447 | |
| 1448 static bool | |
| 1449 gate_dce (void) | |
| 1450 { | |
| 1451 return flag_tree_dce != 0; | |
| 1452 } | |
| 1453 | |
| 1454 struct gimple_opt_pass pass_dce = | |
| 1455 { | |
| 1456 { | |
| 1457 GIMPLE_PASS, | |
| 1458 "dce", /* name */ | |
| 1459 gate_dce, /* gate */ | |
| 1460 tree_ssa_dce, /* execute */ | |
| 1461 NULL, /* sub */ | |
| 1462 NULL, /* next */ | |
| 1463 0, /* static_pass_number */ | |
| 1464 TV_TREE_DCE, /* tv_id */ | |
| 1465 PROP_cfg | PROP_ssa, /* properties_required */ | |
| 1466 0, /* properties_provided */ | |
| 1467 0, /* properties_destroyed */ | |
| 1468 0, /* todo_flags_start */ | |
| 1469 TODO_dump_func | TODO_verify_ssa /* todo_flags_finish */ | |
| 1470 } | |
| 1471 }; | |
| 1472 | |
| 1473 struct gimple_opt_pass pass_dce_loop = | |
| 1474 { | |
| 1475 { | |
| 1476 GIMPLE_PASS, | |
| 1477 "dceloop", /* name */ | |
| 1478 gate_dce, /* gate */ | |
| 1479 tree_ssa_dce_loop, /* execute */ | |
| 1480 NULL, /* sub */ | |
| 1481 NULL, /* next */ | |
| 1482 0, /* static_pass_number */ | |
| 1483 TV_TREE_DCE, /* tv_id */ | |
| 1484 PROP_cfg | PROP_ssa, /* properties_required */ | |
| 1485 0, /* properties_provided */ | |
| 1486 0, /* properties_destroyed */ | |
| 1487 0, /* todo_flags_start */ | |
| 1488 TODO_dump_func | TODO_verify_ssa /* todo_flags_finish */ | |
| 1489 } | |
| 1490 }; | |
| 1491 | |
| 1492 struct gimple_opt_pass pass_cd_dce = | |
| 1493 { | |
| 1494 { | |
| 1495 GIMPLE_PASS, | |
| 1496 "cddce", /* name */ | |
| 1497 gate_dce, /* gate */ | |
| 1498 tree_ssa_cd_dce, /* execute */ | |
| 1499 NULL, /* sub */ | |
| 1500 NULL, /* next */ | |
| 1501 0, /* static_pass_number */ | |
| 1502 TV_TREE_CD_DCE, /* tv_id */ | |
| 1503 PROP_cfg | PROP_ssa, /* properties_required */ | |
| 1504 0, /* properties_provided */ | |
| 1505 0, /* properties_destroyed */ | |
| 1506 0, /* todo_flags_start */ | |
| 1507 TODO_dump_func | TODO_verify_ssa | |
| 1508 | TODO_verify_flow /* todo_flags_finish */ | |
| 1509 } | |
| 1510 }; |