Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-loop-manip.c @ 128:fe568345ddd5
fix CbC-example
| author | mir3636 |
|---|---|
| date | Wed, 11 Apr 2018 19:32:28 +0900 |
| parents | 04ced10e8804 |
| children | 84e7813d76e9 |
| rev | line source |
|---|---|
| 0 | 1 /* High-level loop manipulation functions. |
| 111 | 2 Copyright (C) 2004-2017 Free Software Foundation, Inc. |
|
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3 |
| 0 | 4 This file is part of GCC. |
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5 |
| 0 | 6 GCC is free software; you can redistribute it and/or modify it |
| 7 under the terms of the GNU General Public License as published by the | |
| 8 Free Software Foundation; either version 3, or (at your option) any | |
| 9 later version. | |
|
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10 |
| 0 | 11 GCC is distributed in the hope that it will be useful, but WITHOUT |
| 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
|
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15 |
| 0 | 16 You should have received a copy of the GNU General Public License |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 #include "config.h" | |
| 21 #include "system.h" | |
| 22 #include "coretypes.h" | |
| 111 | 23 #include "backend.h" |
| 0 | 24 #include "tree.h" |
| 111 | 25 #include "gimple.h" |
| 26 #include "cfghooks.h" | |
| 27 #include "tree-pass.h" /* ??? for TODO_update_ssa but this isn't a pass. */ | |
| 28 #include "ssa.h" | |
| 29 #include "gimple-pretty-print.h" | |
| 30 #include "fold-const.h" | |
| 31 #include "cfganal.h" | |
| 32 #include "gimplify.h" | |
| 33 #include "gimple-iterator.h" | |
| 34 #include "gimplify-me.h" | |
| 35 #include "tree-cfg.h" | |
| 36 #include "tree-ssa-loop-ivopts.h" | |
| 37 #include "tree-ssa-loop-manip.h" | |
| 38 #include "tree-ssa-loop-niter.h" | |
| 39 #include "tree-ssa-loop.h" | |
| 40 #include "tree-into-ssa.h" | |
| 41 #include "tree-ssa.h" | |
| 0 | 42 #include "cfgloop.h" |
| 43 #include "tree-scalar-evolution.h" | |
| 44 #include "params.h" | |
| 45 #include "tree-inline.h" | |
| 111 | 46 |
| 47 /* All bitmaps for rewriting into loop-closed SSA go on this obstack, | |
| 48 so that we can free them all at once. */ | |
| 49 static bitmap_obstack loop_renamer_obstack; | |
| 0 | 50 |
| 51 /* Creates an induction variable with value BASE + STEP * iteration in LOOP. | |
| 52 It is expected that neither BASE nor STEP are shared with other expressions | |
| 53 (unless the sharing rules allow this). Use VAR as a base var_decl for it | |
| 54 (if NULL, a new temporary will be created). The increment will occur at | |
|
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55 INCR_POS (after it if AFTER is true, before it otherwise). INCR_POS and |
| 0 | 56 AFTER can be computed using standard_iv_increment_position. The ssa versions |
| 57 of the variable before and after increment will be stored in VAR_BEFORE and | |
| 58 VAR_AFTER (unless they are NULL). */ | |
| 59 | |
| 60 void | |
| 61 create_iv (tree base, tree step, tree var, struct loop *loop, | |
| 62 gimple_stmt_iterator *incr_pos, bool after, | |
| 63 tree *var_before, tree *var_after) | |
| 64 { | |
| 111 | 65 gassign *stmt; |
| 66 gphi *phi; | |
| 0 | 67 tree initial, step1; |
| 68 gimple_seq stmts; | |
| 69 tree vb, va; | |
| 70 enum tree_code incr_op = PLUS_EXPR; | |
| 71 edge pe = loop_preheader_edge (loop); | |
| 72 | |
| 111 | 73 if (var != NULL_TREE) |
| 0 | 74 { |
| 111 | 75 vb = make_ssa_name (var); |
| 76 va = make_ssa_name (var); | |
| 0 | 77 } |
| 111 | 78 else |
| 79 { | |
| 80 vb = make_temp_ssa_name (TREE_TYPE (base), NULL, "ivtmp"); | |
| 81 va = make_temp_ssa_name (TREE_TYPE (base), NULL, "ivtmp"); | |
| 82 } | |
| 0 | 83 if (var_before) |
| 84 *var_before = vb; | |
| 85 if (var_after) | |
| 86 *var_after = va; | |
| 87 | |
| 88 /* For easier readability of the created code, produce MINUS_EXPRs | |
| 89 when suitable. */ | |
| 90 if (TREE_CODE (step) == INTEGER_CST) | |
| 91 { | |
| 92 if (TYPE_UNSIGNED (TREE_TYPE (step))) | |
| 93 { | |
| 94 step1 = fold_build1 (NEGATE_EXPR, TREE_TYPE (step), step); | |
| 95 if (tree_int_cst_lt (step1, step)) | |
| 96 { | |
| 97 incr_op = MINUS_EXPR; | |
| 98 step = step1; | |
| 99 } | |
| 100 } | |
| 101 else | |
| 102 { | |
| 103 bool ovf; | |
| 104 | |
| 105 if (!tree_expr_nonnegative_warnv_p (step, &ovf) | |
| 106 && may_negate_without_overflow_p (step)) | |
| 107 { | |
| 108 incr_op = MINUS_EXPR; | |
| 109 step = fold_build1 (NEGATE_EXPR, TREE_TYPE (step), step); | |
| 110 } | |
| 111 } | |
| 112 } | |
| 113 if (POINTER_TYPE_P (TREE_TYPE (base))) | |
| 114 { | |
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115 if (TREE_CODE (base) == ADDR_EXPR) |
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116 mark_addressable (TREE_OPERAND (base, 0)); |
| 111 | 117 step = convert_to_ptrofftype (step); |
| 0 | 118 if (incr_op == MINUS_EXPR) |
| 111 | 119 step = fold_build1 (NEGATE_EXPR, TREE_TYPE (step), step); |
| 0 | 120 incr_op = POINTER_PLUS_EXPR; |
| 121 } | |
| 122 /* Gimplify the step if necessary. We put the computations in front of the | |
| 123 loop (i.e. the step should be loop invariant). */ | |
| 124 step = force_gimple_operand (step, &stmts, true, NULL_TREE); | |
| 125 if (stmts) | |
| 126 gsi_insert_seq_on_edge_immediate (pe, stmts); | |
| 127 | |
| 111 | 128 stmt = gimple_build_assign (va, incr_op, vb, step); |
| 0 | 129 if (after) |
| 130 gsi_insert_after (incr_pos, stmt, GSI_NEW_STMT); | |
| 131 else | |
| 132 gsi_insert_before (incr_pos, stmt, GSI_NEW_STMT); | |
| 133 | |
| 134 initial = force_gimple_operand (base, &stmts, true, var); | |
| 135 if (stmts) | |
| 136 gsi_insert_seq_on_edge_immediate (pe, stmts); | |
| 137 | |
| 111 | 138 phi = create_phi_node (vb, loop->header); |
| 139 add_phi_arg (phi, initial, loop_preheader_edge (loop), UNKNOWN_LOCATION); | |
| 140 add_phi_arg (phi, va, loop_latch_edge (loop), UNKNOWN_LOCATION); | |
| 141 } | |
| 142 | |
| 143 /* Return the innermost superloop LOOP of USE_LOOP that is a superloop of | |
| 144 both DEF_LOOP and USE_LOOP. */ | |
| 145 | |
| 146 static inline struct loop * | |
| 147 find_sibling_superloop (struct loop *use_loop, struct loop *def_loop) | |
| 148 { | |
| 149 unsigned ud = loop_depth (use_loop); | |
| 150 unsigned dd = loop_depth (def_loop); | |
| 151 gcc_assert (ud > 0 && dd > 0); | |
| 152 if (ud > dd) | |
| 153 use_loop = superloop_at_depth (use_loop, dd); | |
| 154 if (ud < dd) | |
| 155 def_loop = superloop_at_depth (def_loop, ud); | |
| 156 while (loop_outer (use_loop) != loop_outer (def_loop)) | |
| 157 { | |
| 158 use_loop = loop_outer (use_loop); | |
| 159 def_loop = loop_outer (def_loop); | |
| 160 gcc_assert (use_loop && def_loop); | |
| 161 } | |
| 162 return use_loop; | |
| 0 | 163 } |
| 164 | |
| 111 | 165 /* DEF_BB is a basic block containing a DEF that needs rewriting into |
| 166 loop-closed SSA form. USE_BLOCKS is the set of basic blocks containing | |
| 167 uses of DEF that "escape" from the loop containing DEF_BB (i.e. blocks in | |
| 168 USE_BLOCKS are dominated by DEF_BB but not in the loop father of DEF_B). | |
| 169 ALL_EXITS[I] is the set of all basic blocks that exit loop I. | |
| 170 | |
| 171 Compute the subset of LOOP_EXITS that exit the loop containing DEF_BB | |
| 172 or one of its loop fathers, in which DEF is live. This set is returned | |
| 173 in the bitmap LIVE_EXITS. | |
| 174 | |
| 175 Instead of computing the complete livein set of the def, we use the loop | |
| 176 nesting tree as a form of poor man's structure analysis. This greatly | |
| 177 speeds up the analysis, which is important because this function may be | |
| 178 called on all SSA names that need rewriting, one at a time. */ | |
| 0 | 179 |
| 180 static void | |
| 111 | 181 compute_live_loop_exits (bitmap live_exits, bitmap use_blocks, |
| 182 bitmap *loop_exits, basic_block def_bb) | |
| 0 | 183 { |
| 111 | 184 unsigned i; |
| 185 bitmap_iterator bi; | |
| 186 struct loop *def_loop = def_bb->loop_father; | |
| 187 unsigned def_loop_depth = loop_depth (def_loop); | |
| 188 bitmap def_loop_exits; | |
| 189 | |
| 190 /* Normally the work list size is bounded by the number of basic | |
| 191 blocks in the largest loop. We don't know this number, but we | |
| 192 can be fairly sure that it will be relatively small. */ | |
| 193 auto_vec<basic_block> worklist (MAX (8, n_basic_blocks_for_fn (cfun) / 128)); | |
| 194 | |
| 195 EXECUTE_IF_SET_IN_BITMAP (use_blocks, 0, i, bi) | |
| 196 { | |
| 197 basic_block use_bb = BASIC_BLOCK_FOR_FN (cfun, i); | |
| 198 struct loop *use_loop = use_bb->loop_father; | |
| 199 gcc_checking_assert (def_loop != use_loop | |
| 200 && ! flow_loop_nested_p (def_loop, use_loop)); | |
| 201 if (! flow_loop_nested_p (use_loop, def_loop)) | |
| 202 use_bb = find_sibling_superloop (use_loop, def_loop)->header; | |
| 203 if (bitmap_set_bit (live_exits, use_bb->index)) | |
| 204 worklist.safe_push (use_bb); | |
| 205 } | |
| 206 | |
| 207 /* Iterate until the worklist is empty. */ | |
| 208 while (! worklist.is_empty ()) | |
| 209 { | |
| 210 edge e; | |
| 211 edge_iterator ei; | |
| 212 | |
| 213 /* Pull a block off the worklist. */ | |
| 214 basic_block bb = worklist.pop (); | |
| 215 | |
| 216 /* Make sure we have at least enough room in the work list | |
| 217 for all predecessors of this block. */ | |
| 218 worklist.reserve (EDGE_COUNT (bb->preds)); | |
| 219 | |
| 220 /* For each predecessor block. */ | |
| 221 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 222 { | |
| 223 basic_block pred = e->src; | |
| 224 struct loop *pred_loop = pred->loop_father; | |
| 225 unsigned pred_loop_depth = loop_depth (pred_loop); | |
| 226 bool pred_visited; | |
| 227 | |
| 228 /* We should have met DEF_BB along the way. */ | |
| 229 gcc_assert (pred != ENTRY_BLOCK_PTR_FOR_FN (cfun)); | |
| 230 | |
| 231 if (pred_loop_depth >= def_loop_depth) | |
| 232 { | |
| 233 if (pred_loop_depth > def_loop_depth) | |
| 234 pred_loop = superloop_at_depth (pred_loop, def_loop_depth); | |
| 235 /* If we've reached DEF_LOOP, our train ends here. */ | |
| 236 if (pred_loop == def_loop) | |
| 237 continue; | |
| 238 } | |
| 239 else if (! flow_loop_nested_p (pred_loop, def_loop)) | |
| 240 pred = find_sibling_superloop (pred_loop, def_loop)->header; | |
| 241 | |
| 242 /* Add PRED to the LIVEIN set. PRED_VISITED is true if | |
| 243 we had already added PRED to LIVEIN before. */ | |
| 244 pred_visited = !bitmap_set_bit (live_exits, pred->index); | |
| 245 | |
| 246 /* If we have visited PRED before, don't add it to the worklist. | |
| 247 If BB dominates PRED, then we're probably looking at a loop. | |
| 248 We're only interested in looking up in the dominance tree | |
| 249 because DEF_BB dominates all the uses. */ | |
| 250 if (pred_visited || dominated_by_p (CDI_DOMINATORS, pred, bb)) | |
| 251 continue; | |
| 252 | |
| 253 worklist.quick_push (pred); | |
| 254 } | |
| 255 } | |
| 256 | |
| 257 def_loop_exits = BITMAP_ALLOC (&loop_renamer_obstack); | |
| 258 for (struct loop *loop = def_loop; | |
| 259 loop != current_loops->tree_root; | |
| 260 loop = loop_outer (loop)) | |
| 261 bitmap_ior_into (def_loop_exits, loop_exits[loop->num]); | |
| 262 bitmap_and_into (live_exits, def_loop_exits); | |
| 263 BITMAP_FREE (def_loop_exits); | |
| 264 } | |
| 265 | |
| 266 /* Add a loop-closing PHI for VAR in basic block EXIT. */ | |
| 267 | |
| 268 static void | |
| 269 add_exit_phi (basic_block exit, tree var) | |
| 270 { | |
| 271 gphi *phi; | |
| 0 | 272 edge e; |
| 273 edge_iterator ei; | |
| 274 | |
| 111 | 275 /* Check that at least one of the edges entering the EXIT block exits |
| 276 the loop, or a superloop of that loop, that VAR is defined in. */ | |
| 277 if (flag_checking) | |
| 0 | 278 { |
| 111 | 279 gimple *def_stmt = SSA_NAME_DEF_STMT (var); |
| 280 basic_block def_bb = gimple_bb (def_stmt); | |
| 281 FOR_EACH_EDGE (e, ei, exit->preds) | |
| 282 { | |
| 283 struct loop *aloop = find_common_loop (def_bb->loop_father, | |
| 284 e->src->loop_father); | |
| 285 if (!flow_bb_inside_loop_p (aloop, e->dest)) | |
| 286 break; | |
| 287 } | |
| 288 gcc_assert (e); | |
| 0 | 289 } |
| 290 | |
| 111 | 291 phi = create_phi_node (NULL_TREE, exit); |
| 292 create_new_def_for (var, phi, gimple_phi_result_ptr (phi)); | |
| 293 FOR_EACH_EDGE (e, ei, exit->preds) | |
| 294 add_phi_arg (phi, var, e, UNKNOWN_LOCATION); | |
| 0 | 295 |
| 111 | 296 if (dump_file && (dump_flags & TDF_DETAILS)) |
| 297 { | |
| 298 fprintf (dump_file, ";; Created LCSSA PHI: "); | |
| 299 print_gimple_stmt (dump_file, phi, 0, dump_flags); | |
| 300 } | |
| 0 | 301 } |
| 302 | |
| 303 /* Add exit phis for VAR that is used in LIVEIN. | |
| 111 | 304 Exits of the loops are stored in LOOP_EXITS. */ |
| 0 | 305 |
| 306 static void | |
| 111 | 307 add_exit_phis_var (tree var, bitmap use_blocks, bitmap *loop_exits) |
| 0 | 308 { |
| 309 unsigned index; | |
| 111 | 310 bitmap_iterator bi; |
| 0 | 311 basic_block def_bb = gimple_bb (SSA_NAME_DEF_STMT (var)); |
| 111 | 312 bitmap live_exits = BITMAP_ALLOC (&loop_renamer_obstack); |
| 313 | |
| 314 gcc_checking_assert (! bitmap_bit_p (use_blocks, def_bb->index)); | |
| 0 | 315 |
| 111 | 316 compute_live_loop_exits (live_exits, use_blocks, loop_exits, def_bb); |
| 0 | 317 |
| 111 | 318 EXECUTE_IF_SET_IN_BITMAP (live_exits, 0, index, bi) |
| 319 { | |
| 320 add_exit_phi (BASIC_BLOCK_FOR_FN (cfun, index), var); | |
| 321 } | |
| 0 | 322 |
| 111 | 323 BITMAP_FREE (live_exits); |
| 0 | 324 } |
| 325 | |
| 326 /* Add exit phis for the names marked in NAMES_TO_RENAME. | |
| 327 Exits of the loops are stored in EXITS. Sets of blocks where the ssa | |
| 328 names are used are stored in USE_BLOCKS. */ | |
| 329 | |
| 330 static void | |
| 111 | 331 add_exit_phis (bitmap names_to_rename, bitmap *use_blocks, bitmap *loop_exits) |
| 0 | 332 { |
| 333 unsigned i; | |
| 334 bitmap_iterator bi; | |
| 335 | |
| 336 EXECUTE_IF_SET_IN_BITMAP (names_to_rename, 0, i, bi) | |
| 337 { | |
| 338 add_exit_phis_var (ssa_name (i), use_blocks[i], loop_exits); | |
| 339 } | |
| 340 } | |
| 341 | |
| 111 | 342 /* Fill the array of bitmaps LOOP_EXITS with all loop exit edge targets. */ |
| 0 | 343 |
| 111 | 344 static void |
| 345 get_loops_exits (bitmap *loop_exits) | |
| 0 | 346 { |
| 111 | 347 struct loop *loop; |
| 348 unsigned j; | |
| 0 | 349 edge e; |
| 350 | |
| 111 | 351 FOR_EACH_LOOP (loop, 0) |
| 0 | 352 { |
| 111 | 353 vec<edge> exit_edges = get_loop_exit_edges (loop); |
| 354 loop_exits[loop->num] = BITMAP_ALLOC (&loop_renamer_obstack); | |
| 355 FOR_EACH_VEC_ELT (exit_edges, j, e) | |
| 356 bitmap_set_bit (loop_exits[loop->num], e->dest->index); | |
| 357 exit_edges.release (); | |
| 0 | 358 } |
| 359 } | |
| 360 | |
| 361 /* For USE in BB, if it is used outside of the loop it is defined in, | |
| 362 mark it for rewrite. Record basic block BB where it is used | |
| 111 | 363 to USE_BLOCKS. Record the ssa name index to NEED_PHIS bitmap. |
| 364 Note that for USEs in phis, BB should be the src of the edge corresponding to | |
| 365 the use, rather than the bb containing the phi. */ | |
| 0 | 366 |
| 367 static void | |
| 368 find_uses_to_rename_use (basic_block bb, tree use, bitmap *use_blocks, | |
| 369 bitmap need_phis) | |
| 370 { | |
| 371 unsigned ver; | |
| 372 basic_block def_bb; | |
| 373 struct loop *def_loop; | |
| 374 | |
| 375 if (TREE_CODE (use) != SSA_NAME) | |
| 376 return; | |
| 377 | |
| 378 ver = SSA_NAME_VERSION (use); | |
| 379 def_bb = gimple_bb (SSA_NAME_DEF_STMT (use)); | |
| 380 if (!def_bb) | |
| 381 return; | |
| 382 def_loop = def_bb->loop_father; | |
| 383 | |
| 384 /* If the definition is not inside a loop, it is not interesting. */ | |
| 385 if (!loop_outer (def_loop)) | |
| 386 return; | |
| 387 | |
| 388 /* If the use is not outside of the loop it is defined in, it is not | |
| 389 interesting. */ | |
| 390 if (flow_bb_inside_loop_p (def_loop, bb)) | |
| 391 return; | |
| 392 | |
| 111 | 393 /* If we're seeing VER for the first time, we still have to allocate |
| 394 a bitmap for its uses. */ | |
| 395 if (bitmap_set_bit (need_phis, ver)) | |
| 396 use_blocks[ver] = BITMAP_ALLOC (&loop_renamer_obstack); | |
| 0 | 397 bitmap_set_bit (use_blocks[ver], bb->index); |
| 398 } | |
| 399 | |
| 111 | 400 /* For uses matching USE_FLAGS in STMT, mark names that are used outside of the |
| 401 loop they are defined to rewrite. Record the set of blocks in which the ssa | |
| 402 names are used to USE_BLOCKS, and the ssa names themselves to NEED_PHIS. */ | |
| 0 | 403 |
| 404 static void | |
| 111 | 405 find_uses_to_rename_stmt (gimple *stmt, bitmap *use_blocks, bitmap need_phis, |
| 406 int use_flags) | |
| 0 | 407 { |
| 408 ssa_op_iter iter; | |
| 409 tree var; | |
| 410 basic_block bb = gimple_bb (stmt); | |
| 411 | |
|
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412 if (is_gimple_debug (stmt)) |
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413 return; |
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414 |
| 111 | 415 /* FOR_EACH_SSA_TREE_OPERAND iterator does not allows SSA_OP_VIRTUAL_USES |
| 416 only. */ | |
| 417 if (use_flags == SSA_OP_VIRTUAL_USES) | |
| 418 { | |
| 419 tree vuse = gimple_vuse (stmt); | |
| 420 if (vuse != NULL_TREE) | |
| 421 find_uses_to_rename_use (bb, gimple_vuse (stmt), use_blocks, need_phis); | |
| 422 } | |
| 423 else | |
| 424 FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, use_flags) | |
| 425 find_uses_to_rename_use (bb, var, use_blocks, need_phis); | |
| 0 | 426 } |
| 427 | |
| 111 | 428 /* Marks names matching USE_FLAGS that are used in BB and outside of the loop |
| 429 they are defined in for rewrite. Records the set of blocks in which the ssa | |
| 430 names are used to USE_BLOCKS. Record the SSA names that will | |
| 0 | 431 need exit PHIs in NEED_PHIS. */ |
| 432 | |
| 433 static void | |
| 111 | 434 find_uses_to_rename_bb (basic_block bb, bitmap *use_blocks, bitmap need_phis, |
| 435 int use_flags) | |
| 0 | 436 { |
| 437 edge e; | |
| 438 edge_iterator ei; | |
| 111 | 439 bool do_virtuals = (use_flags & SSA_OP_VIRTUAL_USES) != 0; |
| 440 bool do_nonvirtuals = (use_flags & SSA_OP_USE) != 0; | |
| 0 | 441 |
| 442 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 111 | 443 for (gphi_iterator bsi = gsi_start_phis (e->dest); !gsi_end_p (bsi); |
| 444 gsi_next (&bsi)) | |
| 445 { | |
| 446 gphi *phi = bsi.phi (); | |
| 447 bool virtual_p = virtual_operand_p (gimple_phi_result (phi)); | |
| 448 if ((virtual_p && do_virtuals) | |
| 449 || (!virtual_p && do_nonvirtuals)) | |
| 450 find_uses_to_rename_use (bb, PHI_ARG_DEF_FROM_EDGE (phi, e), | |
| 451 use_blocks, need_phis); | |
| 452 } | |
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453 |
| 111 | 454 for (gimple_stmt_iterator bsi = gsi_start_bb (bb); !gsi_end_p (bsi); |
| 455 gsi_next (&bsi)) | |
| 456 find_uses_to_rename_stmt (gsi_stmt (bsi), use_blocks, need_phis, | |
| 457 use_flags); | |
| 0 | 458 } |
|
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459 |
| 111 | 460 /* Marks names matching USE_FLAGS that are used outside of the loop they are |
| 461 defined in for rewrite. Records the set of blocks in which the ssa names are | |
| 462 used to USE_BLOCKS. Record the SSA names that will need exit PHIs in | |
| 463 NEED_PHIS. If CHANGED_BBS is not NULL, scan only blocks in this set. */ | |
| 0 | 464 |
| 465 static void | |
| 111 | 466 find_uses_to_rename (bitmap changed_bbs, bitmap *use_blocks, bitmap need_phis, |
| 467 int use_flags) | |
| 0 | 468 { |
| 469 basic_block bb; | |
| 470 unsigned index; | |
| 471 bitmap_iterator bi; | |
| 472 | |
| 111 | 473 if (changed_bbs) |
| 474 EXECUTE_IF_SET_IN_BITMAP (changed_bbs, 0, index, bi) | |
| 475 { | |
| 476 bb = BASIC_BLOCK_FOR_FN (cfun, index); | |
| 477 if (bb) | |
| 478 find_uses_to_rename_bb (bb, use_blocks, need_phis, use_flags); | |
| 479 } | |
| 480 else | |
| 481 FOR_EACH_BB_FN (bb, cfun) | |
| 482 find_uses_to_rename_bb (bb, use_blocks, need_phis, use_flags); | |
| 483 } | |
| 484 | |
| 485 /* Mark uses of DEF that are used outside of the loop they are defined in for | |
| 486 rewrite. Record the set of blocks in which the ssa names are used to | |
| 487 USE_BLOCKS. Record the SSA names that will need exit PHIs in NEED_PHIS. */ | |
| 488 | |
| 489 static void | |
| 490 find_uses_to_rename_def (tree def, bitmap *use_blocks, bitmap need_phis) | |
| 491 { | |
| 492 gimple *use_stmt; | |
| 493 imm_use_iterator imm_iter; | |
| 494 | |
| 495 FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, def) | |
| 0 | 496 { |
| 111 | 497 if (is_gimple_debug (use_stmt)) |
| 498 continue; | |
| 499 | |
| 500 basic_block use_bb = gimple_bb (use_stmt); | |
| 501 | |
| 502 use_operand_p use_p; | |
| 503 FOR_EACH_IMM_USE_ON_STMT (use_p, imm_iter) | |
| 0 | 504 { |
| 111 | 505 if (gimple_code (use_stmt) == GIMPLE_PHI) |
| 506 { | |
| 507 edge e = gimple_phi_arg_edge (as_a <gphi *> (use_stmt), | |
| 508 PHI_ARG_INDEX_FROM_USE (use_p)); | |
| 509 use_bb = e->src; | |
| 510 } | |
| 511 find_uses_to_rename_use (use_bb, USE_FROM_PTR (use_p), use_blocks, | |
| 512 need_phis); | |
| 0 | 513 } |
| 514 } | |
| 111 | 515 } |
| 516 | |
| 517 /* Marks names matching USE_FLAGS that are defined in LOOP and used outside of | |
| 518 it for rewrite. Records the set of blocks in which the ssa names are used to | |
| 519 USE_BLOCKS. Record the SSA names that will need exit PHIs in NEED_PHIS. */ | |
| 520 | |
| 521 static void | |
| 522 find_uses_to_rename_in_loop (struct loop *loop, bitmap *use_blocks, | |
| 523 bitmap need_phis, int use_flags) | |
| 524 { | |
| 525 bool do_virtuals = (use_flags & SSA_OP_VIRTUAL_USES) != 0; | |
| 526 bool do_nonvirtuals = (use_flags & SSA_OP_USE) != 0; | |
| 527 int def_flags = ((do_virtuals ? SSA_OP_VIRTUAL_DEFS : 0) | |
| 528 | (do_nonvirtuals ? SSA_OP_DEF : 0)); | |
| 529 | |
| 530 | |
| 531 basic_block *bbs = get_loop_body (loop); | |
| 532 | |
| 533 for (unsigned int i = 0; i < loop->num_nodes; i++) | |
| 0 | 534 { |
| 111 | 535 basic_block bb = bbs[i]; |
| 536 | |
| 537 for (gphi_iterator bsi = gsi_start_phis (bb); !gsi_end_p (bsi); | |
| 538 gsi_next (&bsi)) | |
| 539 { | |
| 540 gphi *phi = bsi.phi (); | |
| 541 tree res = gimple_phi_result (phi); | |
| 542 bool virtual_p = virtual_operand_p (res); | |
| 543 if ((virtual_p && do_virtuals) | |
| 544 || (!virtual_p && do_nonvirtuals)) | |
| 545 find_uses_to_rename_def (res, use_blocks, need_phis); | |
| 546 } | |
| 547 | |
| 548 for (gimple_stmt_iterator bsi = gsi_start_bb (bb); !gsi_end_p (bsi); | |
| 549 gsi_next (&bsi)) | |
| 0 | 550 { |
| 111 | 551 gimple *stmt = gsi_stmt (bsi); |
| 552 /* FOR_EACH_SSA_TREE_OPERAND iterator does not allows | |
| 553 SSA_OP_VIRTUAL_DEFS only. */ | |
| 554 if (def_flags == SSA_OP_VIRTUAL_DEFS) | |
| 555 { | |
| 556 tree vdef = gimple_vdef (stmt); | |
| 557 if (vdef != NULL) | |
| 558 find_uses_to_rename_def (vdef, use_blocks, need_phis); | |
| 559 } | |
| 560 else | |
| 561 { | |
| 562 tree var; | |
| 563 ssa_op_iter iter; | |
| 564 FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, def_flags) | |
| 565 find_uses_to_rename_def (var, use_blocks, need_phis); | |
| 566 } | |
| 0 | 567 } |
| 568 } | |
| 111 | 569 |
| 570 XDELETEVEC (bbs); | |
| 0 | 571 } |
| 572 | |
| 573 /* Rewrites the program into a loop closed ssa form -- i.e. inserts extra | |
| 574 phi nodes to ensure that no variable is used outside the loop it is | |
| 575 defined in. | |
| 576 | |
| 577 This strengthening of the basic ssa form has several advantages: | |
| 578 | |
| 579 1) Updating it during unrolling/peeling/versioning is trivial, since | |
| 580 we do not need to care about the uses outside of the loop. | |
| 111 | 581 The same applies to virtual operands which are also rewritten into |
| 582 loop closed SSA form. Note that virtual operands are always live | |
| 583 until function exit. | |
| 0 | 584 2) The behavior of all uses of an induction variable is the same. |
| 585 Without this, you need to distinguish the case when the variable | |
| 586 is used outside of the loop it is defined in, for example | |
| 587 | |
| 588 for (i = 0; i < 100; i++) | |
| 589 { | |
| 590 for (j = 0; j < 100; j++) | |
| 591 { | |
| 592 k = i + j; | |
| 593 use1 (k); | |
| 594 } | |
| 595 use2 (k); | |
| 596 } | |
| 597 | |
| 598 Looking from the outer loop with the normal SSA form, the first use of k | |
| 599 is not well-behaved, while the second one is an induction variable with | |
| 600 base 99 and step 1. | |
|
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601 |
| 111 | 602 If LOOP is non-null, only rewrite uses that have defs in LOOP. Otherwise, |
| 603 if CHANGED_BBS is not NULL, we look for uses outside loops only in the | |
| 604 basic blocks in this set. | |
| 605 | |
| 606 USE_FLAGS allows us to specify whether we want virtual, non-virtual or | |
| 607 both variables rewritten. | |
| 0 | 608 |
| 609 UPDATE_FLAG is used in the call to update_ssa. See | |
| 610 TODO_update_ssa* for documentation. */ | |
| 611 | |
| 612 void | |
| 111 | 613 rewrite_into_loop_closed_ssa_1 (bitmap changed_bbs, unsigned update_flag, |
| 614 int use_flags, struct loop *loop) | |
| 0 | 615 { |
| 616 bitmap *use_blocks; | |
| 617 bitmap names_to_rename; | |
| 618 | |
| 619 loops_state_set (LOOP_CLOSED_SSA); | |
| 111 | 620 if (number_of_loops (cfun) <= 1) |
| 0 | 621 return; |
| 622 | |
| 623 /* If the pass has caused the SSA form to be out-of-date, update it | |
| 624 now. */ | |
| 111 | 625 if (update_flag != 0) |
| 626 update_ssa (update_flag); | |
| 627 else if (flag_checking) | |
| 628 verify_ssa (true, true); | |
| 629 | |
| 630 bitmap_obstack_initialize (&loop_renamer_obstack); | |
| 0 | 631 |
| 111 | 632 names_to_rename = BITMAP_ALLOC (&loop_renamer_obstack); |
| 0 | 633 |
| 111 | 634 /* Uses of names to rename. We don't have to initialize this array, |
| 635 because we know that we will only have entries for the SSA names | |
| 636 in NAMES_TO_RENAME. */ | |
| 637 use_blocks = XNEWVEC (bitmap, num_ssa_names); | |
| 0 | 638 |
| 111 | 639 if (loop != NULL) |
| 640 { | |
| 641 gcc_assert (changed_bbs == NULL); | |
| 642 find_uses_to_rename_in_loop (loop, use_blocks, names_to_rename, | |
| 643 use_flags); | |
| 644 } | |
| 645 else | |
| 646 { | |
| 647 gcc_assert (loop == NULL); | |
| 648 find_uses_to_rename (changed_bbs, use_blocks, names_to_rename, use_flags); | |
| 649 } | |
| 0 | 650 |
| 111 | 651 if (!bitmap_empty_p (names_to_rename)) |
| 652 { | |
| 653 /* An array of bitmaps where LOOP_EXITS[I] is the set of basic blocks | |
| 654 that are the destination of an edge exiting loop number I. */ | |
| 655 bitmap *loop_exits = XNEWVEC (bitmap, number_of_loops (cfun)); | |
| 656 get_loops_exits (loop_exits); | |
| 657 | |
| 658 /* Add the PHI nodes on exits of the loops for the names we need to | |
| 659 rewrite. */ | |
| 660 add_exit_phis (names_to_rename, use_blocks, loop_exits); | |
| 661 | |
| 662 free (loop_exits); | |
| 663 | |
| 664 /* Fix up all the names found to be used outside their original | |
| 665 loops. */ | |
| 666 update_ssa (TODO_update_ssa); | |
| 667 } | |
| 668 | |
| 669 bitmap_obstack_release (&loop_renamer_obstack); | |
| 0 | 670 free (use_blocks); |
| 671 } | |
| 672 | |
| 111 | 673 /* Rewrites the non-virtual defs and uses into a loop closed ssa form. If |
| 674 CHANGED_BBS is not NULL, we look for uses outside loops only in the basic | |
| 675 blocks in this set. UPDATE_FLAG is used in the call to update_ssa. See | |
| 676 TODO_update_ssa* for documentation. */ | |
| 677 | |
| 678 void | |
| 679 rewrite_into_loop_closed_ssa (bitmap changed_bbs, unsigned update_flag) | |
| 680 { | |
| 681 rewrite_into_loop_closed_ssa_1 (changed_bbs, update_flag, SSA_OP_USE, NULL); | |
| 682 } | |
| 683 | |
| 684 /* Rewrites virtual defs and uses with def in LOOP into loop closed ssa | |
| 685 form. */ | |
| 686 | |
| 687 void | |
| 688 rewrite_virtuals_into_loop_closed_ssa (struct loop *loop) | |
| 689 { | |
| 690 rewrite_into_loop_closed_ssa_1 (NULL, 0, SSA_OP_VIRTUAL_USES, loop); | |
| 691 } | |
| 692 | |
| 693 /* Check invariants of the loop closed ssa form for the def in DEF_BB. */ | |
| 0 | 694 |
| 695 static void | |
| 111 | 696 check_loop_closed_ssa_def (basic_block def_bb, tree def) |
| 0 | 697 { |
| 111 | 698 use_operand_p use_p; |
| 699 imm_use_iterator iterator; | |
| 700 FOR_EACH_IMM_USE_FAST (use_p, iterator, def) | |
| 701 { | |
| 702 if (is_gimple_debug (USE_STMT (use_p))) | |
| 703 continue; | |
|
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704 |
| 111 | 705 basic_block use_bb = gimple_bb (USE_STMT (use_p)); |
| 706 if (is_a <gphi *> (USE_STMT (use_p))) | |
| 707 use_bb = EDGE_PRED (use_bb, PHI_ARG_INDEX_FROM_USE (use_p))->src; | |
| 0 | 708 |
| 111 | 709 gcc_assert (flow_bb_inside_loop_p (def_bb->loop_father, use_bb)); |
| 710 } | |
| 0 | 711 } |
| 712 | |
| 111 | 713 /* Checks invariants of loop closed ssa form in BB. */ |
| 0 | 714 |
| 715 static void | |
| 111 | 716 check_loop_closed_ssa_bb (basic_block bb) |
| 0 | 717 { |
| 111 | 718 for (gphi_iterator bsi = gsi_start_phis (bb); !gsi_end_p (bsi); |
| 719 gsi_next (&bsi)) | |
| 720 { | |
| 721 gphi *phi = bsi.phi (); | |
| 722 | |
| 723 if (!virtual_operand_p (PHI_RESULT (phi))) | |
| 724 check_loop_closed_ssa_def (bb, PHI_RESULT (phi)); | |
| 725 } | |
| 0 | 726 |
| 111 | 727 for (gimple_stmt_iterator bsi = gsi_start_nondebug_bb (bb); !gsi_end_p (bsi); |
| 728 gsi_next_nondebug (&bsi)) | |
| 729 { | |
| 730 ssa_op_iter iter; | |
| 731 tree var; | |
| 732 gimple *stmt = gsi_stmt (bsi); | |
|
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733 |
| 111 | 734 FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, SSA_OP_DEF) |
| 735 check_loop_closed_ssa_def (bb, var); | |
| 736 } | |
| 0 | 737 } |
| 738 | |
|
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739 /* Checks that invariants of the loop closed ssa form are preserved. |
| 111 | 740 Call verify_ssa when VERIFY_SSA_P is true. Note all loops are checked |
| 741 if LOOP is NULL, otherwise, only LOOP is checked. */ | |
| 0 | 742 |
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743 DEBUG_FUNCTION void |
| 111 | 744 verify_loop_closed_ssa (bool verify_ssa_p, struct loop *loop) |
| 0 | 745 { |
| 111 | 746 if (number_of_loops (cfun) <= 1) |
| 0 | 747 return; |
| 748 | |
|
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749 if (verify_ssa_p) |
| 111 | 750 verify_ssa (false, true); |
| 0 | 751 |
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752 timevar_push (TV_VERIFY_LOOP_CLOSED); |
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|
753 |
| 111 | 754 if (loop == NULL) |
| 0 | 755 { |
| 111 | 756 basic_block bb; |
| 0 | 757 |
| 111 | 758 FOR_EACH_BB_FN (bb, cfun) |
| 759 if (bb->loop_father && bb->loop_father->num > 0) | |
| 760 check_loop_closed_ssa_bb (bb); | |
| 761 } | |
| 762 else | |
| 763 { | |
| 764 basic_block *bbs = get_loop_body (loop); | |
| 765 | |
| 766 for (unsigned i = 0; i < loop->num_nodes; ++i) | |
| 767 check_loop_closed_ssa_bb (bbs[i]); | |
| 768 | |
| 769 free (bbs); | |
| 0 | 770 } |
|
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771 |
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|
772 timevar_pop (TV_VERIFY_LOOP_CLOSED); |
| 0 | 773 } |
| 774 | |
| 775 /* Split loop exit edge EXIT. The things are a bit complicated by a need to | |
| 776 preserve the loop closed ssa form. The newly created block is returned. */ | |
| 777 | |
| 778 basic_block | |
| 779 split_loop_exit_edge (edge exit) | |
| 780 { | |
| 781 basic_block dest = exit->dest; | |
| 782 basic_block bb = split_edge (exit); | |
| 111 | 783 gphi *phi, *new_phi; |
| 0 | 784 tree new_name, name; |
| 785 use_operand_p op_p; | |
| 111 | 786 gphi_iterator psi; |
|
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|
787 source_location locus; |
| 0 | 788 |
| 789 for (psi = gsi_start_phis (dest); !gsi_end_p (psi); gsi_next (&psi)) | |
| 790 { | |
| 111 | 791 phi = psi.phi (); |
| 0 | 792 op_p = PHI_ARG_DEF_PTR_FROM_EDGE (phi, single_succ_edge (bb)); |
|
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793 locus = gimple_phi_arg_location_from_edge (phi, single_succ_edge (bb)); |
| 0 | 794 |
| 795 name = USE_FROM_PTR (op_p); | |
| 796 | |
| 797 /* If the argument of the PHI node is a constant, we do not need | |
| 798 to keep it inside loop. */ | |
| 799 if (TREE_CODE (name) != SSA_NAME) | |
| 800 continue; | |
| 801 | |
| 802 /* Otherwise create an auxiliary phi node that will copy the value | |
| 803 of the SSA name out of the loop. */ | |
| 804 new_name = duplicate_ssa_name (name, NULL); | |
| 805 new_phi = create_phi_node (new_name, bb); | |
|
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806 add_phi_arg (new_phi, name, exit, locus); |
| 0 | 807 SET_USE (op_p, new_name); |
| 808 } | |
| 809 | |
| 810 return bb; | |
| 811 } | |
| 812 | |
| 813 /* Returns the basic block in that statements should be emitted for induction | |
| 814 variables incremented at the end of the LOOP. */ | |
| 815 | |
| 816 basic_block | |
| 817 ip_end_pos (struct loop *loop) | |
| 818 { | |
| 819 return loop->latch; | |
| 820 } | |
| 821 | |
| 822 /* Returns the basic block in that statements should be emitted for induction | |
| 823 variables incremented just before exit condition of a LOOP. */ | |
| 824 | |
| 825 basic_block | |
| 826 ip_normal_pos (struct loop *loop) | |
| 827 { | |
| 111 | 828 gimple *last; |
| 0 | 829 basic_block bb; |
| 830 edge exit; | |
| 831 | |
| 832 if (!single_pred_p (loop->latch)) | |
| 833 return NULL; | |
| 834 | |
| 835 bb = single_pred (loop->latch); | |
| 836 last = last_stmt (bb); | |
| 837 if (!last | |
| 838 || gimple_code (last) != GIMPLE_COND) | |
| 839 return NULL; | |
| 840 | |
| 841 exit = EDGE_SUCC (bb, 0); | |
| 842 if (exit->dest == loop->latch) | |
| 843 exit = EDGE_SUCC (bb, 1); | |
| 844 | |
| 845 if (flow_bb_inside_loop_p (loop, exit->dest)) | |
| 846 return NULL; | |
| 847 | |
| 848 return bb; | |
| 849 } | |
| 850 | |
| 851 /* Stores the standard position for induction variable increment in LOOP | |
| 852 (just before the exit condition if it is available and latch block is empty, | |
| 853 end of the latch block otherwise) to BSI. INSERT_AFTER is set to true if | |
| 854 the increment should be inserted after *BSI. */ | |
| 855 | |
| 856 void | |
| 857 standard_iv_increment_position (struct loop *loop, gimple_stmt_iterator *bsi, | |
| 858 bool *insert_after) | |
| 859 { | |
| 860 basic_block bb = ip_normal_pos (loop), latch = ip_end_pos (loop); | |
| 111 | 861 gimple *last = last_stmt (latch); |
| 0 | 862 |
| 863 if (!bb | |
| 864 || (last && gimple_code (last) != GIMPLE_LABEL)) | |
| 865 { | |
| 866 *bsi = gsi_last_bb (latch); | |
| 867 *insert_after = true; | |
| 868 } | |
| 869 else | |
| 870 { | |
| 871 *bsi = gsi_last_bb (bb); | |
| 872 *insert_after = false; | |
| 873 } | |
| 874 } | |
| 875 | |
| 876 /* Copies phi node arguments for duplicated blocks. The index of the first | |
| 877 duplicated block is FIRST_NEW_BLOCK. */ | |
| 878 | |
| 879 static void | |
| 880 copy_phi_node_args (unsigned first_new_block) | |
| 881 { | |
| 882 unsigned i; | |
| 883 | |
| 111 | 884 for (i = first_new_block; i < (unsigned) last_basic_block_for_fn (cfun); i++) |
| 885 BASIC_BLOCK_FOR_FN (cfun, i)->flags |= BB_DUPLICATED; | |
| 0 | 886 |
| 111 | 887 for (i = first_new_block; i < (unsigned) last_basic_block_for_fn (cfun); i++) |
| 888 add_phi_args_after_copy_bb (BASIC_BLOCK_FOR_FN (cfun, i)); | |
| 0 | 889 |
| 111 | 890 for (i = first_new_block; i < (unsigned) last_basic_block_for_fn (cfun); i++) |
| 891 BASIC_BLOCK_FOR_FN (cfun, i)->flags &= ~BB_DUPLICATED; | |
| 0 | 892 } |
| 893 | |
| 894 | |
| 895 /* The same as cfgloopmanip.c:duplicate_loop_to_header_edge, but also | |
| 896 updates the PHI nodes at start of the copied region. In order to | |
| 897 achieve this, only loops whose exits all lead to the same location | |
| 898 are handled. | |
| 899 | |
| 900 Notice that we do not completely update the SSA web after | |
| 901 duplication. The caller is responsible for calling update_ssa | |
| 902 after the loop has been duplicated. */ | |
| 903 | |
| 904 bool | |
| 905 gimple_duplicate_loop_to_header_edge (struct loop *loop, edge e, | |
| 906 unsigned int ndupl, sbitmap wont_exit, | |
| 111 | 907 edge orig, vec<edge> *to_remove, |
| 0 | 908 int flags) |
| 909 { | |
| 910 unsigned first_new_block; | |
| 911 | |
| 912 if (!loops_state_satisfies_p (LOOPS_HAVE_SIMPLE_LATCHES)) | |
| 913 return false; | |
| 914 if (!loops_state_satisfies_p (LOOPS_HAVE_PREHEADERS)) | |
| 915 return false; | |
| 916 | |
| 111 | 917 first_new_block = last_basic_block_for_fn (cfun); |
| 0 | 918 if (!duplicate_loop_to_header_edge (loop, e, ndupl, wont_exit, |
| 919 orig, to_remove, flags)) | |
| 920 return false; | |
| 921 | |
| 922 /* Readd the removed phi args for e. */ | |
| 923 flush_pending_stmts (e); | |
| 924 | |
| 925 /* Copy the phi node arguments. */ | |
| 926 copy_phi_node_args (first_new_block); | |
| 927 | |
| 928 scev_reset (); | |
| 929 | |
| 930 return true; | |
| 931 } | |
| 932 | |
| 933 /* Returns true if we can unroll LOOP FACTOR times. Number | |
| 934 of iterations of the loop is returned in NITER. */ | |
| 935 | |
| 936 bool | |
| 937 can_unroll_loop_p (struct loop *loop, unsigned factor, | |
| 938 struct tree_niter_desc *niter) | |
| 939 { | |
| 940 edge exit; | |
| 941 | |
| 942 /* Check whether unrolling is possible. We only want to unroll loops | |
| 943 for that we are able to determine number of iterations. We also | |
| 944 want to split the extra iterations of the loop from its end, | |
| 945 therefore we require that the loop has precisely one | |
| 946 exit. */ | |
| 947 | |
| 948 exit = single_dom_exit (loop); | |
| 949 if (!exit) | |
| 950 return false; | |
| 951 | |
| 952 if (!number_of_iterations_exit (loop, exit, niter, false) | |
| 953 || niter->cmp == ERROR_MARK | |
| 954 /* Scalar evolutions analysis might have copy propagated | |
| 955 the abnormal ssa names into these expressions, hence | |
| 956 emitting the computations based on them during loop | |
| 957 unrolling might create overlapping life ranges for | |
| 958 them, and failures in out-of-ssa. */ | |
| 959 || contains_abnormal_ssa_name_p (niter->may_be_zero) | |
| 960 || contains_abnormal_ssa_name_p (niter->control.base) | |
| 961 || contains_abnormal_ssa_name_p (niter->control.step) | |
| 962 || contains_abnormal_ssa_name_p (niter->bound)) | |
| 963 return false; | |
| 964 | |
| 965 /* And of course, we must be able to duplicate the loop. */ | |
| 966 if (!can_duplicate_loop_p (loop)) | |
| 967 return false; | |
| 968 | |
| 969 /* The final loop should be small enough. */ | |
| 970 if (tree_num_loop_insns (loop, &eni_size_weights) * factor | |
| 971 > (unsigned) PARAM_VALUE (PARAM_MAX_UNROLLED_INSNS)) | |
| 972 return false; | |
| 973 | |
| 974 return true; | |
| 975 } | |
| 976 | |
| 977 /* Determines the conditions that control execution of LOOP unrolled FACTOR | |
| 978 times. DESC is number of iterations of LOOP. ENTER_COND is set to | |
| 979 condition that must be true if the main loop can be entered. | |
| 980 EXIT_BASE, EXIT_STEP, EXIT_CMP and EXIT_BOUND are set to values describing | |
| 981 how the exit from the unrolled loop should be controlled. */ | |
| 982 | |
| 983 static void | |
| 984 determine_exit_conditions (struct loop *loop, struct tree_niter_desc *desc, | |
| 985 unsigned factor, tree *enter_cond, | |
| 986 tree *exit_base, tree *exit_step, | |
| 987 enum tree_code *exit_cmp, tree *exit_bound) | |
| 988 { | |
| 989 gimple_seq stmts; | |
| 990 tree base = desc->control.base; | |
| 991 tree step = desc->control.step; | |
| 992 tree bound = desc->bound; | |
| 993 tree type = TREE_TYPE (step); | |
| 994 tree bigstep, delta; | |
| 995 tree min = lower_bound_in_type (type, type); | |
| 996 tree max = upper_bound_in_type (type, type); | |
| 997 enum tree_code cmp = desc->cmp; | |
| 998 tree cond = boolean_true_node, assum; | |
| 999 | |
| 111 | 1000 /* For pointers, do the arithmetics in the type of step. */ |
| 0 | 1001 base = fold_convert (type, base); |
| 1002 bound = fold_convert (type, bound); | |
| 1003 | |
| 1004 *enter_cond = boolean_false_node; | |
| 1005 *exit_base = NULL_TREE; | |
| 1006 *exit_step = NULL_TREE; | |
| 1007 *exit_cmp = ERROR_MARK; | |
| 1008 *exit_bound = NULL_TREE; | |
| 1009 gcc_assert (cmp != ERROR_MARK); | |
| 1010 | |
| 1011 /* We only need to be correct when we answer question | |
| 1012 "Do at least FACTOR more iterations remain?" in the unrolled loop. | |
| 1013 Thus, transforming BASE + STEP * i <> BOUND to | |
| 1014 BASE + STEP * i < BOUND is ok. */ | |
| 1015 if (cmp == NE_EXPR) | |
| 1016 { | |
| 1017 if (tree_int_cst_sign_bit (step)) | |
| 1018 cmp = GT_EXPR; | |
| 1019 else | |
| 1020 cmp = LT_EXPR; | |
| 1021 } | |
| 1022 else if (cmp == LT_EXPR) | |
| 1023 { | |
| 1024 gcc_assert (!tree_int_cst_sign_bit (step)); | |
| 1025 } | |
| 1026 else if (cmp == GT_EXPR) | |
| 1027 { | |
| 1028 gcc_assert (tree_int_cst_sign_bit (step)); | |
| 1029 } | |
| 1030 else | |
| 1031 gcc_unreachable (); | |
| 1032 | |
| 1033 /* The main body of the loop may be entered iff: | |
| 1034 | |
| 1035 1) desc->may_be_zero is false. | |
| 1036 2) it is possible to check that there are at least FACTOR iterations | |
| 1037 of the loop, i.e., BOUND - step * FACTOR does not overflow. | |
| 1038 3) # of iterations is at least FACTOR */ | |
| 1039 | |
| 1040 if (!integer_zerop (desc->may_be_zero)) | |
| 1041 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, | |
| 1042 invert_truthvalue (desc->may_be_zero), | |
| 1043 cond); | |
| 1044 | |
| 1045 bigstep = fold_build2 (MULT_EXPR, type, step, | |
| 1046 build_int_cst_type (type, factor)); | |
| 1047 delta = fold_build2 (MINUS_EXPR, type, bigstep, step); | |
| 1048 if (cmp == LT_EXPR) | |
| 1049 assum = fold_build2 (GE_EXPR, boolean_type_node, | |
| 1050 bound, | |
| 1051 fold_build2 (PLUS_EXPR, type, min, delta)); | |
| 1052 else | |
| 1053 assum = fold_build2 (LE_EXPR, boolean_type_node, | |
| 1054 bound, | |
| 1055 fold_build2 (PLUS_EXPR, type, max, delta)); | |
| 1056 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, assum, cond); | |
| 1057 | |
| 1058 bound = fold_build2 (MINUS_EXPR, type, bound, delta); | |
| 1059 assum = fold_build2 (cmp, boolean_type_node, base, bound); | |
| 1060 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, assum, cond); | |
| 1061 | |
| 1062 cond = force_gimple_operand (unshare_expr (cond), &stmts, false, NULL_TREE); | |
| 1063 if (stmts) | |
| 1064 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
| 1065 /* cond now may be a gimple comparison, which would be OK, but also any | |
| 1066 other gimple rhs (say a && b). In this case we need to force it to | |
| 1067 operand. */ | |
| 1068 if (!is_gimple_condexpr (cond)) | |
| 1069 { | |
| 1070 cond = force_gimple_operand (cond, &stmts, true, NULL_TREE); | |
| 1071 if (stmts) | |
| 1072 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
| 1073 } | |
| 1074 *enter_cond = cond; | |
| 1075 | |
| 1076 base = force_gimple_operand (unshare_expr (base), &stmts, true, NULL_TREE); | |
| 1077 if (stmts) | |
| 1078 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
| 1079 bound = force_gimple_operand (unshare_expr (bound), &stmts, true, NULL_TREE); | |
| 1080 if (stmts) | |
| 1081 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
| 1082 | |
| 1083 *exit_base = base; | |
| 1084 *exit_step = bigstep; | |
| 1085 *exit_cmp = cmp; | |
| 1086 *exit_bound = bound; | |
| 1087 } | |
| 1088 | |
| 1089 /* Scales the frequencies of all basic blocks in LOOP that are strictly | |
| 1090 dominated by BB by NUM/DEN. */ | |
| 1091 | |
| 1092 static void | |
| 1093 scale_dominated_blocks_in_loop (struct loop *loop, basic_block bb, | |
| 1094 int num, int den) | |
| 1095 { | |
| 1096 basic_block son; | |
| 1097 | |
| 1098 if (den == 0) | |
| 1099 return; | |
| 1100 | |
| 1101 for (son = first_dom_son (CDI_DOMINATORS, bb); | |
| 1102 son; | |
| 1103 son = next_dom_son (CDI_DOMINATORS, son)) | |
| 1104 { | |
| 1105 if (!flow_bb_inside_loop_p (loop, son)) | |
| 1106 continue; | |
| 1107 scale_bbs_frequencies_int (&son, 1, num, den); | |
| 1108 scale_dominated_blocks_in_loop (loop, son, num, den); | |
| 1109 } | |
| 1110 } | |
| 1111 | |
| 111 | 1112 /* Return estimated niter for LOOP after unrolling by FACTOR times. */ |
| 1113 | |
| 1114 gcov_type | |
| 1115 niter_for_unrolled_loop (struct loop *loop, unsigned factor) | |
| 1116 { | |
| 1117 gcc_assert (factor != 0); | |
| 1118 bool profile_p = false; | |
| 1119 gcov_type est_niter = expected_loop_iterations_unbounded (loop, &profile_p); | |
| 1120 /* Note that this is really CEIL (est_niter + 1, factor) - 1, where the | |
| 1121 "+ 1" converts latch iterations to loop iterations and the "- 1" | |
| 1122 converts back. */ | |
| 1123 gcov_type new_est_niter = est_niter / factor; | |
| 1124 | |
| 1125 /* Without profile feedback, loops for which we do not know a better estimate | |
| 1126 are assumed to roll 10 times. When we unroll such loop, it appears to | |
| 1127 roll too little, and it may even seem to be cold. To avoid this, we | |
| 1128 ensure that the created loop appears to roll at least 5 times (but at | |
| 1129 most as many times as before unrolling). Don't do adjustment if profile | |
| 1130 feedback is present. */ | |
| 1131 if (new_est_niter < 5 && !profile_p) | |
| 1132 { | |
| 1133 if (est_niter < 5) | |
| 1134 new_est_niter = est_niter; | |
| 1135 else | |
| 1136 new_est_niter = 5; | |
| 1137 } | |
| 1138 | |
| 1139 if (loop->any_upper_bound) | |
| 1140 { | |
| 1141 /* As above, this is really CEIL (upper_bound + 1, factor) - 1. */ | |
| 1142 widest_int bound = wi::udiv_floor (loop->nb_iterations_upper_bound, | |
| 1143 factor); | |
| 1144 if (wi::ltu_p (bound, new_est_niter)) | |
| 1145 new_est_niter = bound.to_uhwi (); | |
| 1146 } | |
| 1147 | |
| 1148 return new_est_niter; | |
| 1149 } | |
| 1150 | |
| 0 | 1151 /* Unroll LOOP FACTOR times. DESC describes number of iterations of LOOP. |
| 1152 EXIT is the exit of the loop to that DESC corresponds. | |
| 1153 | |
| 1154 If N is number of iterations of the loop and MAY_BE_ZERO is the condition | |
| 1155 under that loop exits in the first iteration even if N != 0, | |
|
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1156 |
| 0 | 1157 while (1) |
| 1158 { | |
| 1159 x = phi (init, next); | |
| 1160 | |
| 1161 pre; | |
| 1162 if (st) | |
| 1163 break; | |
| 1164 post; | |
| 1165 } | |
| 1166 | |
| 1167 becomes (with possibly the exit conditions formulated a bit differently, | |
| 1168 avoiding the need to create a new iv): | |
|
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1169 |
| 0 | 1170 if (MAY_BE_ZERO || N < FACTOR) |
| 1171 goto rest; | |
| 1172 | |
| 1173 do | |
| 1174 { | |
| 1175 x = phi (init, next); | |
| 1176 | |
| 1177 pre; | |
| 1178 post; | |
| 1179 pre; | |
| 1180 post; | |
| 1181 ... | |
| 1182 pre; | |
| 1183 post; | |
| 1184 N -= FACTOR; | |
|
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1185 |
| 0 | 1186 } while (N >= FACTOR); |
| 1187 | |
| 1188 rest: | |
| 1189 init' = phi (init, x); | |
| 1190 | |
| 1191 while (1) | |
| 1192 { | |
| 1193 x = phi (init', next); | |
| 1194 | |
| 1195 pre; | |
| 1196 if (st) | |
| 1197 break; | |
| 1198 post; | |
| 1199 } | |
|
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1200 |
| 0 | 1201 Before the loop is unrolled, TRANSFORM is called for it (only for the |
| 1202 unrolled loop, but not for its versioned copy). DATA is passed to | |
| 1203 TRANSFORM. */ | |
| 1204 | |
| 1205 /* Probability in % that the unrolled loop is entered. Just a guess. */ | |
| 1206 #define PROB_UNROLLED_LOOP_ENTERED 90 | |
| 1207 | |
| 1208 void | |
| 1209 tree_transform_and_unroll_loop (struct loop *loop, unsigned factor, | |
| 1210 edge exit, struct tree_niter_desc *desc, | |
| 1211 transform_callback transform, | |
| 1212 void *data) | |
| 1213 { | |
| 111 | 1214 gcond *exit_if; |
| 0 | 1215 tree ctr_before, ctr_after; |
| 1216 tree enter_main_cond, exit_base, exit_step, exit_bound; | |
| 1217 enum tree_code exit_cmp; | |
| 111 | 1218 gphi *phi_old_loop, *phi_new_loop, *phi_rest; |
| 1219 gphi_iterator psi_old_loop, psi_new_loop; | |
| 1220 tree init, next, new_init; | |
| 0 | 1221 struct loop *new_loop; |
| 1222 basic_block rest, exit_bb; | |
| 1223 edge old_entry, new_entry, old_latch, precond_edge, new_exit; | |
| 1224 edge new_nonexit, e; | |
| 1225 gimple_stmt_iterator bsi; | |
| 1226 use_operand_p op; | |
| 1227 bool ok; | |
| 111 | 1228 unsigned i; |
| 1229 profile_probability prob, prob_entry, scale_unrolled; | |
| 1230 profile_count freq_e, freq_h; | |
| 1231 gcov_type new_est_niter = niter_for_unrolled_loop (loop, factor); | |
| 0 | 1232 unsigned irr = loop_preheader_edge (loop)->flags & EDGE_IRREDUCIBLE_LOOP; |
| 111 | 1233 auto_vec<edge> to_remove; |
| 0 | 1234 |
| 1235 determine_exit_conditions (loop, desc, factor, | |
| 1236 &enter_main_cond, &exit_base, &exit_step, | |
| 1237 &exit_cmp, &exit_bound); | |
| 1238 | |
| 1239 /* Let us assume that the unrolled loop is quite likely to be entered. */ | |
| 1240 if (integer_nonzerop (enter_main_cond)) | |
| 111 | 1241 prob_entry = profile_probability::always (); |
| 0 | 1242 else |
| 111 | 1243 prob_entry = profile_probability::guessed_always () |
| 1244 .apply_scale (PROB_UNROLLED_LOOP_ENTERED, 100); | |
| 0 | 1245 |
| 1246 /* The values for scales should keep profile consistent, and somewhat close | |
| 1247 to correct. | |
| 1248 | |
| 1249 TODO: The current value of SCALE_REST makes it appear that the loop that | |
| 1250 is created by splitting the remaining iterations of the unrolled loop is | |
| 1251 executed the same number of times as the original loop, and with the same | |
| 1252 frequencies, which is obviously wrong. This does not appear to cause | |
| 1253 problems, so we do not bother with fixing it for now. To make the profile | |
| 1254 correct, we would need to change the probability of the exit edge of the | |
| 1255 loop, and recompute the distribution of frequencies in its body because | |
| 1256 of this change (scale the frequencies of blocks before and after the exit | |
| 1257 by appropriate factors). */ | |
| 1258 scale_unrolled = prob_entry; | |
| 1259 | |
| 111 | 1260 new_loop = loop_version (loop, enter_main_cond, NULL, prob_entry, |
| 1261 prob_entry.invert (), scale_unrolled, | |
| 1262 profile_probability::guessed_always (), | |
| 1263 true); | |
| 0 | 1264 gcc_assert (new_loop != NULL); |
| 1265 update_ssa (TODO_update_ssa); | |
| 1266 | |
| 1267 /* Prepare the cfg and update the phi nodes. Move the loop exit to the | |
| 1268 loop latch (and make its condition dummy, for the moment). */ | |
| 1269 rest = loop_preheader_edge (new_loop)->src; | |
| 1270 precond_edge = single_pred_edge (rest); | |
| 1271 split_edge (loop_latch_edge (loop)); | |
| 1272 exit_bb = single_pred (loop->latch); | |
| 1273 | |
| 1274 /* Since the exit edge will be removed, the frequency of all the blocks | |
| 1275 in the loop that are dominated by it must be scaled by | |
| 1276 1 / (1 - exit->probability). */ | |
| 111 | 1277 if (exit->probability.initialized_p ()) |
| 1278 scale_dominated_blocks_in_loop (loop, exit->src, | |
| 1279 /* We are scaling up here so probability | |
| 1280 does not fit. */ | |
| 1281 REG_BR_PROB_BASE, | |
| 1282 REG_BR_PROB_BASE | |
| 1283 - exit->probability.to_reg_br_prob_base ()); | |
| 0 | 1284 |
| 1285 bsi = gsi_last_bb (exit_bb); | |
| 1286 exit_if = gimple_build_cond (EQ_EXPR, integer_zero_node, | |
| 1287 integer_zero_node, | |
| 1288 NULL_TREE, NULL_TREE); | |
| 1289 | |
| 1290 gsi_insert_after (&bsi, exit_if, GSI_NEW_STMT); | |
| 1291 new_exit = make_edge (exit_bb, rest, EDGE_FALSE_VALUE | irr); | |
| 1292 rescan_loop_exit (new_exit, true, false); | |
| 1293 | |
| 1294 /* Set the probability of new exit to the same of the old one. Fix | |
| 1295 the frequency of the latch block, by scaling it back by | |
| 1296 1 - exit->probability. */ | |
| 1297 new_exit->probability = exit->probability; | |
| 1298 new_nonexit = single_pred_edge (loop->latch); | |
| 111 | 1299 new_nonexit->probability = exit->probability.invert (); |
| 0 | 1300 new_nonexit->flags = EDGE_TRUE_VALUE; |
| 111 | 1301 if (new_nonexit->probability.initialized_p ()) |
| 1302 scale_bbs_frequencies (&loop->latch, 1, new_nonexit->probability); | |
| 0 | 1303 |
| 1304 old_entry = loop_preheader_edge (loop); | |
| 1305 new_entry = loop_preheader_edge (new_loop); | |
| 1306 old_latch = loop_latch_edge (loop); | |
| 1307 for (psi_old_loop = gsi_start_phis (loop->header), | |
| 1308 psi_new_loop = gsi_start_phis (new_loop->header); | |
| 1309 !gsi_end_p (psi_old_loop); | |
| 1310 gsi_next (&psi_old_loop), gsi_next (&psi_new_loop)) | |
| 1311 { | |
| 111 | 1312 phi_old_loop = psi_old_loop.phi (); |
| 1313 phi_new_loop = psi_new_loop.phi (); | |
| 0 | 1314 |
| 1315 init = PHI_ARG_DEF_FROM_EDGE (phi_old_loop, old_entry); | |
| 1316 op = PHI_ARG_DEF_PTR_FROM_EDGE (phi_new_loop, new_entry); | |
| 1317 gcc_assert (operand_equal_for_phi_arg_p (init, USE_FROM_PTR (op))); | |
| 1318 next = PHI_ARG_DEF_FROM_EDGE (phi_old_loop, old_latch); | |
| 1319 | |
| 1320 /* Prefer using original variable as a base for the new ssa name. | |
| 1321 This is necessary for virtual ops, and useful in order to avoid | |
| 1322 losing debug info for real ops. */ | |
|
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1323 if (TREE_CODE (next) == SSA_NAME |
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1324 && useless_type_conversion_p (TREE_TYPE (next), |
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1325 TREE_TYPE (init))) |
| 111 | 1326 new_init = copy_ssa_name (next); |
|
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1327 else if (TREE_CODE (init) == SSA_NAME |
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1328 && useless_type_conversion_p (TREE_TYPE (init), |
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1329 TREE_TYPE (next))) |
| 111 | 1330 new_init = copy_ssa_name (init); |
|
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1331 else if (useless_type_conversion_p (TREE_TYPE (next), TREE_TYPE (init))) |
| 111 | 1332 new_init = make_temp_ssa_name (TREE_TYPE (next), NULL, "unrinittmp"); |
| 0 | 1333 else |
| 111 | 1334 new_init = make_temp_ssa_name (TREE_TYPE (init), NULL, "unrinittmp"); |
| 0 | 1335 |
| 1336 phi_rest = create_phi_node (new_init, rest); | |
| 1337 | |
|
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1338 add_phi_arg (phi_rest, init, precond_edge, UNKNOWN_LOCATION); |
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1339 add_phi_arg (phi_rest, next, new_exit, UNKNOWN_LOCATION); |
| 0 | 1340 SET_USE (op, new_init); |
| 1341 } | |
| 1342 | |
| 1343 remove_path (exit); | |
| 1344 | |
| 1345 /* Transform the loop. */ | |
| 1346 if (transform) | |
| 1347 (*transform) (loop, data); | |
| 1348 | |
| 1349 /* Unroll the loop and remove the exits in all iterations except for the | |
| 1350 last one. */ | |
| 111 | 1351 auto_sbitmap wont_exit (factor); |
| 1352 bitmap_ones (wont_exit); | |
| 1353 bitmap_clear_bit (wont_exit, factor - 1); | |
| 0 | 1354 |
| 1355 ok = gimple_duplicate_loop_to_header_edge | |
| 1356 (loop, loop_latch_edge (loop), factor - 1, | |
| 1357 wont_exit, new_exit, &to_remove, DLTHE_FLAG_UPDATE_FREQ); | |
| 1358 gcc_assert (ok); | |
| 1359 | |
| 111 | 1360 FOR_EACH_VEC_ELT (to_remove, i, e) |
| 0 | 1361 { |
| 1362 ok = remove_path (e); | |
| 1363 gcc_assert (ok); | |
| 1364 } | |
| 1365 update_ssa (TODO_update_ssa); | |
| 1366 | |
| 1367 /* Ensure that the frequencies in the loop match the new estimated | |
| 1368 number of iterations, and change the probability of the new | |
| 1369 exit edge. */ | |
| 111 | 1370 |
| 1371 freq_h = loop->header->count; | |
| 1372 freq_e = (loop_preheader_edge (loop))->count (); | |
| 1373 /* Use frequency only if counts are zero. */ | |
| 1374 if (!(freq_h > 0) && !(freq_e > 0)) | |
| 1375 { | |
| 1376 freq_h = profile_count::from_gcov_type (loop->header->frequency); | |
| 1377 freq_e = profile_count::from_gcov_type | |
| 1378 (EDGE_FREQUENCY (loop_preheader_edge (loop))); | |
| 1379 } | |
| 1380 if (freq_h > 0) | |
| 1381 { | |
| 1382 /* Avoid dropping loop body profile counter to 0 because of zero count | |
| 1383 in loop's preheader. */ | |
| 1384 if (freq_e == profile_count::zero ()) | |
| 1385 freq_e = profile_count::from_gcov_type (1); | |
| 1386 scale_loop_frequencies (loop, freq_e.probability_in (freq_h)); | |
| 1387 } | |
| 0 | 1388 |
| 1389 exit_bb = single_pred (loop->latch); | |
| 1390 new_exit = find_edge (exit_bb, rest); | |
| 111 | 1391 new_exit->probability = profile_probability::always () |
| 1392 .apply_scale (1, new_est_niter + 1); | |
| 0 | 1393 |
| 111 | 1394 rest->count += new_exit->count (); |
| 0 | 1395 rest->frequency += EDGE_FREQUENCY (new_exit); |
| 1396 | |
| 1397 new_nonexit = single_pred_edge (loop->latch); | |
| 1398 prob = new_nonexit->probability; | |
| 111 | 1399 new_nonexit->probability = new_exit->probability.invert (); |
| 1400 prob = new_nonexit->probability / prob; | |
| 1401 if (prob.initialized_p ()) | |
| 1402 scale_bbs_frequencies (&loop->latch, 1, prob); | |
| 0 | 1403 |
| 1404 /* Finally create the new counter for number of iterations and add the new | |
| 1405 exit instruction. */ | |
|
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|
1406 bsi = gsi_last_nondebug_bb (exit_bb); |
| 111 | 1407 exit_if = as_a <gcond *> (gsi_stmt (bsi)); |
| 0 | 1408 create_iv (exit_base, exit_step, NULL_TREE, loop, |
| 1409 &bsi, false, &ctr_before, &ctr_after); | |
| 1410 gimple_cond_set_code (exit_if, exit_cmp); | |
| 1411 gimple_cond_set_lhs (exit_if, ctr_after); | |
| 1412 gimple_cond_set_rhs (exit_if, exit_bound); | |
| 1413 update_stmt (exit_if); | |
| 1414 | |
| 111 | 1415 checking_verify_flow_info (); |
| 1416 checking_verify_loop_structure (); | |
| 1417 checking_verify_loop_closed_ssa (true, loop); | |
| 1418 checking_verify_loop_closed_ssa (true, new_loop); | |
| 0 | 1419 } |
| 1420 | |
| 1421 /* Wrapper over tree_transform_and_unroll_loop for case we do not | |
| 1422 want to transform the loop before unrolling. The meaning | |
| 1423 of the arguments is the same as for tree_transform_and_unroll_loop. */ | |
| 1424 | |
| 1425 void | |
| 1426 tree_unroll_loop (struct loop *loop, unsigned factor, | |
| 1427 edge exit, struct tree_niter_desc *desc) | |
| 1428 { | |
| 1429 tree_transform_and_unroll_loop (loop, factor, exit, desc, | |
| 1430 NULL, NULL); | |
| 1431 } | |
|
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|
1432 |
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|
1433 /* Rewrite the phi node at position PSI in function of the main |
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|
1434 induction variable MAIN_IV and insert the generated code at GSI. */ |
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|
1435 |
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|
1436 static void |
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|
1437 rewrite_phi_with_iv (loop_p loop, |
| 111 | 1438 gphi_iterator *psi, |
|
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|
1439 gimple_stmt_iterator *gsi, |
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|
1440 tree main_iv) |
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|
1441 { |
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|
1442 affine_iv iv; |
| 111 | 1443 gassign *stmt; |
| 1444 gphi *phi = psi->phi (); | |
|
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|
1445 tree atype, mtype, val, res = PHI_RESULT (phi); |
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|
1446 |
| 111 | 1447 if (virtual_operand_p (res) || res == main_iv) |
|
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|
1448 { |
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|
1449 gsi_next (psi); |
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|
1450 return; |
|
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|
1451 } |
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|
1452 |
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|
1453 if (!simple_iv (loop, loop, res, &iv, true)) |
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|
1454 { |
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|
1455 gsi_next (psi); |
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|
1456 return; |
|
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|
1457 } |
|
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|
1458 |
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|
1459 remove_phi_node (psi, false); |
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|
1460 |
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|
1461 atype = TREE_TYPE (res); |
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|
1462 mtype = POINTER_TYPE_P (atype) ? sizetype : atype; |
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|
1463 val = fold_build2 (MULT_EXPR, mtype, unshare_expr (iv.step), |
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|
1464 fold_convert (mtype, main_iv)); |
|
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|
1465 val = fold_build2 (POINTER_TYPE_P (atype) |
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|
1466 ? POINTER_PLUS_EXPR : PLUS_EXPR, |
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|
1467 atype, unshare_expr (iv.base), val); |
|
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|
1468 val = force_gimple_operand_gsi (gsi, val, false, NULL_TREE, true, |
|
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|
1469 GSI_SAME_STMT); |
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|
1470 stmt = gimple_build_assign (res, val); |
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|
1471 gsi_insert_before (gsi, stmt, GSI_SAME_STMT); |
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|
1472 } |
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|
1473 |
|
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|
1474 /* Rewrite all the phi nodes of LOOP in function of the main induction |
|
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|
1475 variable MAIN_IV. */ |
|
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|
1476 |
|
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|
1477 static void |
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|
1478 rewrite_all_phi_nodes_with_iv (loop_p loop, tree main_iv) |
|
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|
1479 { |
|
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|
1480 unsigned i; |
|
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|
1481 basic_block *bbs = get_loop_body_in_dom_order (loop); |
| 111 | 1482 gphi_iterator psi; |
|
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|
1483 |
|
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|
1484 for (i = 0; i < loop->num_nodes; i++) |
|
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|
1485 { |
|
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|
1486 basic_block bb = bbs[i]; |
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|
1487 gimple_stmt_iterator gsi = gsi_after_labels (bb); |
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|
1488 |
|
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|
1489 if (bb->loop_father != loop) |
|
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|
1490 continue; |
|
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|
1491 |
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|
1492 for (psi = gsi_start_phis (bb); !gsi_end_p (psi); ) |
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|
1493 rewrite_phi_with_iv (loop, &psi, &gsi, main_iv); |
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|
1494 } |
|
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|
1495 |
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|
1496 free (bbs); |
|
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|
1497 } |
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|
1498 |
| 111 | 1499 /* Bases all the induction variables in LOOP on a single induction variable |
| 1500 (with base 0 and step 1), whose final value is compared with *NIT. When the | |
| 1501 IV type precision has to be larger than *NIT type precision, *NIT is | |
| 1502 converted to the larger type, the conversion code is inserted before the | |
| 1503 loop, and *NIT is updated to the new definition. When BUMP_IN_LATCH is true, | |
| 1504 the induction variable is incremented in the loop latch, otherwise it is | |
| 1505 incremented in the loop header. Return the induction variable that was | |
| 1506 created. */ | |
|
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|
1507 |
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|
1508 tree |
|
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|
1509 canonicalize_loop_ivs (struct loop *loop, tree *nit, bool bump_in_latch) |
|
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|
1510 { |
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|
1511 unsigned precision = TYPE_PRECISION (TREE_TYPE (*nit)); |
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|
1512 unsigned original_precision = precision; |
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|
1513 tree type, var_before; |
| 111 | 1514 gimple_stmt_iterator gsi; |
| 1515 gphi_iterator psi; | |
| 1516 gcond *stmt; | |
|
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|
1517 edge exit = single_dom_exit (loop); |
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|
1518 gimple_seq stmts; |
| 111 | 1519 bool unsigned_p = false; |
|
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|
1520 |
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|
1521 for (psi = gsi_start_phis (loop->header); |
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|
1522 !gsi_end_p (psi); gsi_next (&psi)) |
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|
1523 { |
| 111 | 1524 gphi *phi = psi.phi (); |
|
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|
1525 tree res = PHI_RESULT (phi); |
| 111 | 1526 bool uns; |
|
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|
1527 |
| 111 | 1528 type = TREE_TYPE (res); |
| 1529 if (virtual_operand_p (res) | |
| 1530 || (!INTEGRAL_TYPE_P (type) | |
| 1531 && !POINTER_TYPE_P (type)) | |
| 1532 || TYPE_PRECISION (type) < precision) | |
| 1533 continue; | |
| 1534 | |
| 1535 uns = POINTER_TYPE_P (type) | TYPE_UNSIGNED (type); | |
| 1536 | |
| 1537 if (TYPE_PRECISION (type) > precision) | |
| 1538 unsigned_p = uns; | |
| 1539 else | |
| 1540 unsigned_p |= uns; | |
| 1541 | |
| 1542 precision = TYPE_PRECISION (type); | |
|
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1543 } |
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1544 |
| 111 | 1545 scalar_int_mode mode = smallest_int_mode_for_size (precision); |
| 1546 precision = GET_MODE_PRECISION (mode); | |
| 1547 type = build_nonstandard_integer_type (precision, unsigned_p); | |
|
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1548 |
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1549 if (original_precision != precision) |
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1550 { |
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1551 *nit = fold_convert (type, *nit); |
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1552 *nit = force_gimple_operand (*nit, &stmts, true, NULL_TREE); |
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1553 if (stmts) |
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1554 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); |
|
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1555 } |
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1556 |
|
67
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|
1557 if (bump_in_latch) |
|
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|
1558 gsi = gsi_last_bb (loop->latch); |
|
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|
1559 else |
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|
1560 gsi = gsi_last_nondebug_bb (loop->header); |
|
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1561 create_iv (build_int_cst_type (type, 0), build_int_cst (type, 1), NULL_TREE, |
|
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|
1562 loop, &gsi, bump_in_latch, &var_before, NULL); |
|
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|
1563 |
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|
1564 rewrite_all_phi_nodes_with_iv (loop, var_before); |
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1565 |
| 111 | 1566 stmt = as_a <gcond *> (last_stmt (exit->src)); |
|
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1567 /* Make the loop exit if the control condition is not satisfied. */ |
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|
1568 if (exit->flags & EDGE_TRUE_VALUE) |
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1569 { |
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|
1570 edge te, fe; |
|
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|
1571 |
|
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|
1572 extract_true_false_edges_from_block (exit->src, &te, &fe); |
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1573 te->flags = EDGE_FALSE_VALUE; |
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1574 fe->flags = EDGE_TRUE_VALUE; |
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1575 } |
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|
1576 gimple_cond_set_code (stmt, LT_EXPR); |
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1577 gimple_cond_set_lhs (stmt, var_before); |
|
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|
1578 gimple_cond_set_rhs (stmt, *nit); |
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|
1579 update_stmt (stmt); |
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1580 |
|
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1581 return var_before; |
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1582 } |