Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-loop-manip.c @ 108:7ad14f446135
add CbC-example/rectypeTest/
| author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Thu, 14 Jun 2012 20:30:24 +0900 |
| parents | f6334be47118 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* High-level loop manipulation functions. |
|
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2 Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 |
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3 Free Software Foundation, Inc. |
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4 |
| 0 | 5 This file is part of GCC. |
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6 |
| 0 | 7 GCC is free software; you can redistribute it and/or modify it |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 3, or (at your option) any | |
| 10 later version. | |
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11 |
| 0 | 12 GCC is distributed in the hope that it will be useful, but WITHOUT |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
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16 |
| 0 | 17 You should have received a copy of the GNU General Public License |
| 18 along with GCC; see the file COPYING3. If not see | |
| 19 <http://www.gnu.org/licenses/>. */ | |
| 20 | |
| 21 #include "config.h" | |
| 22 #include "system.h" | |
| 23 #include "coretypes.h" | |
| 24 #include "tm.h" | |
| 25 #include "tree.h" | |
| 26 #include "tm_p.h" | |
| 27 #include "basic-block.h" | |
| 28 #include "output.h" | |
| 29 #include "tree-flow.h" | |
| 30 #include "tree-dump.h" | |
| 31 #include "timevar.h" | |
| 32 #include "cfgloop.h" | |
| 33 #include "tree-pass.h" | |
| 34 #include "cfglayout.h" | |
| 35 #include "tree-scalar-evolution.h" | |
| 36 #include "params.h" | |
| 37 #include "tree-inline.h" | |
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38 #include "langhooks.h" |
| 0 | 39 |
| 40 /* Creates an induction variable with value BASE + STEP * iteration in LOOP. | |
| 41 It is expected that neither BASE nor STEP are shared with other expressions | |
| 42 (unless the sharing rules allow this). Use VAR as a base var_decl for it | |
| 43 (if NULL, a new temporary will be created). The increment will occur at | |
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44 INCR_POS (after it if AFTER is true, before it otherwise). INCR_POS and |
| 0 | 45 AFTER can be computed using standard_iv_increment_position. The ssa versions |
| 46 of the variable before and after increment will be stored in VAR_BEFORE and | |
| 47 VAR_AFTER (unless they are NULL). */ | |
| 48 | |
| 49 void | |
| 50 create_iv (tree base, tree step, tree var, struct loop *loop, | |
| 51 gimple_stmt_iterator *incr_pos, bool after, | |
| 52 tree *var_before, tree *var_after) | |
| 53 { | |
| 54 gimple stmt; | |
| 55 tree initial, step1; | |
| 56 gimple_seq stmts; | |
| 57 tree vb, va; | |
| 58 enum tree_code incr_op = PLUS_EXPR; | |
| 59 edge pe = loop_preheader_edge (loop); | |
| 60 | |
| 61 if (!var) | |
| 62 { | |
| 63 var = create_tmp_var (TREE_TYPE (base), "ivtmp"); | |
| 64 add_referenced_var (var); | |
| 65 } | |
| 66 | |
| 67 vb = make_ssa_name (var, NULL); | |
| 68 if (var_before) | |
| 69 *var_before = vb; | |
| 70 va = make_ssa_name (var, NULL); | |
| 71 if (var_after) | |
| 72 *var_after = va; | |
| 73 | |
| 74 /* For easier readability of the created code, produce MINUS_EXPRs | |
| 75 when suitable. */ | |
| 76 if (TREE_CODE (step) == INTEGER_CST) | |
| 77 { | |
| 78 if (TYPE_UNSIGNED (TREE_TYPE (step))) | |
| 79 { | |
| 80 step1 = fold_build1 (NEGATE_EXPR, TREE_TYPE (step), step); | |
| 81 if (tree_int_cst_lt (step1, step)) | |
| 82 { | |
| 83 incr_op = MINUS_EXPR; | |
| 84 step = step1; | |
| 85 } | |
| 86 } | |
| 87 else | |
| 88 { | |
| 89 bool ovf; | |
| 90 | |
| 91 if (!tree_expr_nonnegative_warnv_p (step, &ovf) | |
| 92 && may_negate_without_overflow_p (step)) | |
| 93 { | |
| 94 incr_op = MINUS_EXPR; | |
| 95 step = fold_build1 (NEGATE_EXPR, TREE_TYPE (step), step); | |
| 96 } | |
| 97 } | |
| 98 } | |
| 99 if (POINTER_TYPE_P (TREE_TYPE (base))) | |
| 100 { | |
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101 if (TREE_CODE (base) == ADDR_EXPR) |
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102 mark_addressable (TREE_OPERAND (base, 0)); |
| 0 | 103 step = fold_convert (sizetype, step); |
| 104 if (incr_op == MINUS_EXPR) | |
| 105 step = fold_build1 (NEGATE_EXPR, sizetype, step); | |
| 106 incr_op = POINTER_PLUS_EXPR; | |
| 107 } | |
| 108 /* Gimplify the step if necessary. We put the computations in front of the | |
| 109 loop (i.e. the step should be loop invariant). */ | |
| 110 step = force_gimple_operand (step, &stmts, true, NULL_TREE); | |
| 111 if (stmts) | |
| 112 gsi_insert_seq_on_edge_immediate (pe, stmts); | |
| 113 | |
| 114 stmt = gimple_build_assign_with_ops (incr_op, va, vb, step); | |
| 115 if (after) | |
| 116 gsi_insert_after (incr_pos, stmt, GSI_NEW_STMT); | |
| 117 else | |
| 118 gsi_insert_before (incr_pos, stmt, GSI_NEW_STMT); | |
| 119 | |
| 120 initial = force_gimple_operand (base, &stmts, true, var); | |
| 121 if (stmts) | |
| 122 gsi_insert_seq_on_edge_immediate (pe, stmts); | |
| 123 | |
| 124 stmt = create_phi_node (vb, loop->header); | |
| 125 SSA_NAME_DEF_STMT (vb) = stmt; | |
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126 add_phi_arg (stmt, initial, loop_preheader_edge (loop), UNKNOWN_LOCATION); |
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127 add_phi_arg (stmt, va, loop_latch_edge (loop), UNKNOWN_LOCATION); |
| 0 | 128 } |
| 129 | |
| 130 /* Add exit phis for the USE on EXIT. */ | |
| 131 | |
| 132 static void | |
| 133 add_exit_phis_edge (basic_block exit, tree use) | |
| 134 { | |
| 135 gimple phi, def_stmt = SSA_NAME_DEF_STMT (use); | |
| 136 basic_block def_bb = gimple_bb (def_stmt); | |
| 137 struct loop *def_loop; | |
| 138 edge e; | |
| 139 edge_iterator ei; | |
| 140 | |
| 141 /* Check that some of the edges entering the EXIT block exits a loop in | |
| 142 that USE is defined. */ | |
| 143 FOR_EACH_EDGE (e, ei, exit->preds) | |
| 144 { | |
| 145 def_loop = find_common_loop (def_bb->loop_father, e->src->loop_father); | |
| 146 if (!flow_bb_inside_loop_p (def_loop, e->dest)) | |
| 147 break; | |
| 148 } | |
| 149 | |
| 150 if (!e) | |
| 151 return; | |
| 152 | |
| 153 phi = create_phi_node (use, exit); | |
| 154 create_new_def_for (gimple_phi_result (phi), phi, | |
| 155 gimple_phi_result_ptr (phi)); | |
| 156 FOR_EACH_EDGE (e, ei, exit->preds) | |
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157 add_phi_arg (phi, use, e, UNKNOWN_LOCATION); |
| 0 | 158 } |
| 159 | |
| 160 /* Add exit phis for VAR that is used in LIVEIN. | |
| 161 Exits of the loops are stored in EXITS. */ | |
| 162 | |
| 163 static void | |
| 164 add_exit_phis_var (tree var, bitmap livein, bitmap exits) | |
| 165 { | |
| 166 bitmap def; | |
| 167 unsigned index; | |
| 168 basic_block def_bb = gimple_bb (SSA_NAME_DEF_STMT (var)); | |
| 169 bitmap_iterator bi; | |
| 170 | |
| 171 if (is_gimple_reg (var)) | |
| 172 bitmap_clear_bit (livein, def_bb->index); | |
| 173 else | |
| 174 bitmap_set_bit (livein, def_bb->index); | |
| 175 | |
| 176 def = BITMAP_ALLOC (NULL); | |
| 177 bitmap_set_bit (def, def_bb->index); | |
| 178 compute_global_livein (livein, def); | |
| 179 BITMAP_FREE (def); | |
| 180 | |
| 181 EXECUTE_IF_AND_IN_BITMAP (exits, livein, 0, index, bi) | |
| 182 { | |
| 183 add_exit_phis_edge (BASIC_BLOCK (index), var); | |
| 184 } | |
| 185 } | |
| 186 | |
| 187 /* Add exit phis for the names marked in NAMES_TO_RENAME. | |
| 188 Exits of the loops are stored in EXITS. Sets of blocks where the ssa | |
| 189 names are used are stored in USE_BLOCKS. */ | |
| 190 | |
| 191 static void | |
| 192 add_exit_phis (bitmap names_to_rename, bitmap *use_blocks, bitmap loop_exits) | |
| 193 { | |
| 194 unsigned i; | |
| 195 bitmap_iterator bi; | |
| 196 | |
| 197 EXECUTE_IF_SET_IN_BITMAP (names_to_rename, 0, i, bi) | |
| 198 { | |
| 199 add_exit_phis_var (ssa_name (i), use_blocks[i], loop_exits); | |
| 200 } | |
| 201 } | |
| 202 | |
| 203 /* Returns a bitmap of all loop exit edge targets. */ | |
| 204 | |
| 205 static bitmap | |
| 206 get_loops_exits (void) | |
| 207 { | |
| 208 bitmap exits = BITMAP_ALLOC (NULL); | |
| 209 basic_block bb; | |
| 210 edge e; | |
| 211 edge_iterator ei; | |
| 212 | |
| 213 FOR_EACH_BB (bb) | |
| 214 { | |
| 215 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 216 if (e->src != ENTRY_BLOCK_PTR | |
| 217 && !flow_bb_inside_loop_p (e->src->loop_father, bb)) | |
| 218 { | |
| 219 bitmap_set_bit (exits, bb->index); | |
| 220 break; | |
| 221 } | |
| 222 } | |
| 223 | |
| 224 return exits; | |
| 225 } | |
| 226 | |
| 227 /* For USE in BB, if it is used outside of the loop it is defined in, | |
| 228 mark it for rewrite. Record basic block BB where it is used | |
| 229 to USE_BLOCKS. Record the ssa name index to NEED_PHIS bitmap. */ | |
| 230 | |
| 231 static void | |
| 232 find_uses_to_rename_use (basic_block bb, tree use, bitmap *use_blocks, | |
| 233 bitmap need_phis) | |
| 234 { | |
| 235 unsigned ver; | |
| 236 basic_block def_bb; | |
| 237 struct loop *def_loop; | |
| 238 | |
| 239 if (TREE_CODE (use) != SSA_NAME) | |
| 240 return; | |
| 241 | |
| 242 /* We don't need to keep virtual operands in loop-closed form. */ | |
| 243 if (!is_gimple_reg (use)) | |
| 244 return; | |
| 245 | |
| 246 ver = SSA_NAME_VERSION (use); | |
| 247 def_bb = gimple_bb (SSA_NAME_DEF_STMT (use)); | |
| 248 if (!def_bb) | |
| 249 return; | |
| 250 def_loop = def_bb->loop_father; | |
| 251 | |
| 252 /* If the definition is not inside a loop, it is not interesting. */ | |
| 253 if (!loop_outer (def_loop)) | |
| 254 return; | |
| 255 | |
| 256 /* If the use is not outside of the loop it is defined in, it is not | |
| 257 interesting. */ | |
| 258 if (flow_bb_inside_loop_p (def_loop, bb)) | |
| 259 return; | |
| 260 | |
| 261 if (!use_blocks[ver]) | |
| 262 use_blocks[ver] = BITMAP_ALLOC (NULL); | |
| 263 bitmap_set_bit (use_blocks[ver], bb->index); | |
| 264 | |
| 265 bitmap_set_bit (need_phis, ver); | |
| 266 } | |
| 267 | |
| 268 /* For uses in STMT, mark names that are used outside of the loop they are | |
| 269 defined to rewrite. Record the set of blocks in that the ssa | |
| 270 names are defined to USE_BLOCKS and the ssa names themselves to | |
| 271 NEED_PHIS. */ | |
| 272 | |
| 273 static void | |
| 274 find_uses_to_rename_stmt (gimple stmt, bitmap *use_blocks, bitmap need_phis) | |
| 275 { | |
| 276 ssa_op_iter iter; | |
| 277 tree var; | |
| 278 basic_block bb = gimple_bb (stmt); | |
| 279 | |
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280 if (is_gimple_debug (stmt)) |
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281 return; |
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282 |
| 0 | 283 FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, SSA_OP_ALL_USES) |
| 284 find_uses_to_rename_use (bb, var, use_blocks, need_phis); | |
| 285 } | |
| 286 | |
| 287 /* Marks names that are used in BB and outside of the loop they are | |
| 288 defined in for rewrite. Records the set of blocks in that the ssa | |
| 289 names are defined to USE_BLOCKS. Record the SSA names that will | |
| 290 need exit PHIs in NEED_PHIS. */ | |
| 291 | |
| 292 static void | |
| 293 find_uses_to_rename_bb (basic_block bb, bitmap *use_blocks, bitmap need_phis) | |
| 294 { | |
| 295 gimple_stmt_iterator bsi; | |
| 296 edge e; | |
| 297 edge_iterator ei; | |
| 298 | |
| 299 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 300 for (bsi = gsi_start_phis (e->dest); !gsi_end_p (bsi); gsi_next (&bsi)) | |
| 301 find_uses_to_rename_use (bb, PHI_ARG_DEF_FROM_EDGE (gsi_stmt (bsi), e), | |
| 302 use_blocks, need_phis); | |
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303 |
| 0 | 304 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) |
| 305 find_uses_to_rename_stmt (gsi_stmt (bsi), use_blocks, need_phis); | |
| 306 } | |
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307 |
| 0 | 308 /* Marks names that are used outside of the loop they are defined in |
| 309 for rewrite. Records the set of blocks in that the ssa | |
| 310 names are defined to USE_BLOCKS. If CHANGED_BBS is not NULL, | |
| 311 scan only blocks in this set. */ | |
| 312 | |
| 313 static void | |
| 314 find_uses_to_rename (bitmap changed_bbs, bitmap *use_blocks, bitmap need_phis) | |
| 315 { | |
| 316 basic_block bb; | |
| 317 unsigned index; | |
| 318 bitmap_iterator bi; | |
| 319 | |
| 320 if (changed_bbs && !bitmap_empty_p (changed_bbs)) | |
| 321 { | |
| 322 EXECUTE_IF_SET_IN_BITMAP (changed_bbs, 0, index, bi) | |
| 323 { | |
| 324 find_uses_to_rename_bb (BASIC_BLOCK (index), use_blocks, need_phis); | |
| 325 } | |
| 326 } | |
| 327 else | |
| 328 { | |
| 329 FOR_EACH_BB (bb) | |
| 330 { | |
| 331 find_uses_to_rename_bb (bb, use_blocks, need_phis); | |
| 332 } | |
| 333 } | |
| 334 } | |
| 335 | |
| 336 /* Rewrites the program into a loop closed ssa form -- i.e. inserts extra | |
| 337 phi nodes to ensure that no variable is used outside the loop it is | |
| 338 defined in. | |
| 339 | |
| 340 This strengthening of the basic ssa form has several advantages: | |
| 341 | |
| 342 1) Updating it during unrolling/peeling/versioning is trivial, since | |
| 343 we do not need to care about the uses outside of the loop. | |
| 344 2) The behavior of all uses of an induction variable is the same. | |
| 345 Without this, you need to distinguish the case when the variable | |
| 346 is used outside of the loop it is defined in, for example | |
| 347 | |
| 348 for (i = 0; i < 100; i++) | |
| 349 { | |
| 350 for (j = 0; j < 100; j++) | |
| 351 { | |
| 352 k = i + j; | |
| 353 use1 (k); | |
| 354 } | |
| 355 use2 (k); | |
| 356 } | |
| 357 | |
| 358 Looking from the outer loop with the normal SSA form, the first use of k | |
| 359 is not well-behaved, while the second one is an induction variable with | |
| 360 base 99 and step 1. | |
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361 |
| 0 | 362 If CHANGED_BBS is not NULL, we look for uses outside loops only in |
| 363 the basic blocks in this set. | |
| 364 | |
| 365 UPDATE_FLAG is used in the call to update_ssa. See | |
| 366 TODO_update_ssa* for documentation. */ | |
| 367 | |
| 368 void | |
| 369 rewrite_into_loop_closed_ssa (bitmap changed_bbs, unsigned update_flag) | |
| 370 { | |
| 371 bitmap loop_exits; | |
| 372 bitmap *use_blocks; | |
| 373 unsigned i, old_num_ssa_names; | |
| 374 bitmap names_to_rename; | |
| 375 | |
| 376 loops_state_set (LOOP_CLOSED_SSA); | |
| 377 if (number_of_loops () <= 1) | |
| 378 return; | |
| 379 | |
| 380 loop_exits = get_loops_exits (); | |
| 381 names_to_rename = BITMAP_ALLOC (NULL); | |
| 382 | |
| 383 /* If the pass has caused the SSA form to be out-of-date, update it | |
| 384 now. */ | |
| 385 update_ssa (update_flag); | |
| 386 | |
| 387 old_num_ssa_names = num_ssa_names; | |
| 388 use_blocks = XCNEWVEC (bitmap, old_num_ssa_names); | |
| 389 | |
| 390 /* Find the uses outside loops. */ | |
| 391 find_uses_to_rename (changed_bbs, use_blocks, names_to_rename); | |
| 392 | |
| 393 /* Add the PHI nodes on exits of the loops for the names we need to | |
| 394 rewrite. */ | |
| 395 add_exit_phis (names_to_rename, use_blocks, loop_exits); | |
| 396 | |
| 397 for (i = 0; i < old_num_ssa_names; i++) | |
| 398 BITMAP_FREE (use_blocks[i]); | |
| 399 free (use_blocks); | |
| 400 BITMAP_FREE (loop_exits); | |
| 401 BITMAP_FREE (names_to_rename); | |
| 402 | |
| 403 /* Fix up all the names found to be used outside their original | |
| 404 loops. */ | |
| 405 update_ssa (TODO_update_ssa); | |
| 406 } | |
| 407 | |
| 408 /* Check invariants of the loop closed ssa form for the USE in BB. */ | |
| 409 | |
| 410 static void | |
| 411 check_loop_closed_ssa_use (basic_block bb, tree use) | |
| 412 { | |
| 413 gimple def; | |
| 414 basic_block def_bb; | |
|
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415 |
| 0 | 416 if (TREE_CODE (use) != SSA_NAME || !is_gimple_reg (use)) |
| 417 return; | |
| 418 | |
| 419 def = SSA_NAME_DEF_STMT (use); | |
| 420 def_bb = gimple_bb (def); | |
| 421 gcc_assert (!def_bb | |
| 422 || flow_bb_inside_loop_p (def_bb->loop_father, bb)); | |
| 423 } | |
| 424 | |
| 425 /* Checks invariants of loop closed ssa form in statement STMT in BB. */ | |
| 426 | |
| 427 static void | |
| 428 check_loop_closed_ssa_stmt (basic_block bb, gimple stmt) | |
| 429 { | |
| 430 ssa_op_iter iter; | |
| 431 tree var; | |
| 432 | |
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433 if (is_gimple_debug (stmt)) |
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434 return; |
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435 |
| 0 | 436 FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, SSA_OP_ALL_USES) |
| 437 check_loop_closed_ssa_use (bb, var); | |
| 438 } | |
| 439 | |
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440 /* Checks that invariants of the loop closed ssa form are preserved. |
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441 Call verify_ssa when VERIFY_SSA_P is true. */ |
| 0 | 442 |
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443 DEBUG_FUNCTION void |
|
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444 verify_loop_closed_ssa (bool verify_ssa_p) |
| 0 | 445 { |
| 446 basic_block bb; | |
| 447 gimple_stmt_iterator bsi; | |
| 448 gimple phi; | |
| 449 edge e; | |
| 450 edge_iterator ei; | |
| 451 | |
| 452 if (number_of_loops () <= 1) | |
| 453 return; | |
| 454 | |
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455 if (verify_ssa_p) |
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456 verify_ssa (false); |
| 0 | 457 |
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458 timevar_push (TV_VERIFY_LOOP_CLOSED); |
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459 |
| 0 | 460 FOR_EACH_BB (bb) |
| 461 { | |
| 462 for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
| 463 { | |
| 464 phi = gsi_stmt (bsi); | |
| 465 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 466 check_loop_closed_ssa_use (e->src, | |
| 467 PHI_ARG_DEF_FROM_EDGE (phi, e)); | |
| 468 } | |
| 469 | |
| 470 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
| 471 check_loop_closed_ssa_stmt (bb, gsi_stmt (bsi)); | |
| 472 } | |
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473 |
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474 timevar_pop (TV_VERIFY_LOOP_CLOSED); |
| 0 | 475 } |
| 476 | |
| 477 /* Split loop exit edge EXIT. The things are a bit complicated by a need to | |
| 478 preserve the loop closed ssa form. The newly created block is returned. */ | |
| 479 | |
| 480 basic_block | |
| 481 split_loop_exit_edge (edge exit) | |
| 482 { | |
| 483 basic_block dest = exit->dest; | |
| 484 basic_block bb = split_edge (exit); | |
| 485 gimple phi, new_phi; | |
| 486 tree new_name, name; | |
| 487 use_operand_p op_p; | |
| 488 gimple_stmt_iterator psi; | |
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489 source_location locus; |
| 0 | 490 |
| 491 for (psi = gsi_start_phis (dest); !gsi_end_p (psi); gsi_next (&psi)) | |
| 492 { | |
| 493 phi = gsi_stmt (psi); | |
| 494 op_p = PHI_ARG_DEF_PTR_FROM_EDGE (phi, single_succ_edge (bb)); | |
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495 locus = gimple_phi_arg_location_from_edge (phi, single_succ_edge (bb)); |
| 0 | 496 |
| 497 name = USE_FROM_PTR (op_p); | |
| 498 | |
| 499 /* If the argument of the PHI node is a constant, we do not need | |
| 500 to keep it inside loop. */ | |
| 501 if (TREE_CODE (name) != SSA_NAME) | |
| 502 continue; | |
| 503 | |
| 504 /* Otherwise create an auxiliary phi node that will copy the value | |
| 505 of the SSA name out of the loop. */ | |
| 506 new_name = duplicate_ssa_name (name, NULL); | |
| 507 new_phi = create_phi_node (new_name, bb); | |
| 508 SSA_NAME_DEF_STMT (new_name) = new_phi; | |
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509 add_phi_arg (new_phi, name, exit, locus); |
| 0 | 510 SET_USE (op_p, new_name); |
| 511 } | |
| 512 | |
| 513 return bb; | |
| 514 } | |
| 515 | |
| 516 /* Returns the basic block in that statements should be emitted for induction | |
| 517 variables incremented at the end of the LOOP. */ | |
| 518 | |
| 519 basic_block | |
| 520 ip_end_pos (struct loop *loop) | |
| 521 { | |
| 522 return loop->latch; | |
| 523 } | |
| 524 | |
| 525 /* Returns the basic block in that statements should be emitted for induction | |
| 526 variables incremented just before exit condition of a LOOP. */ | |
| 527 | |
| 528 basic_block | |
| 529 ip_normal_pos (struct loop *loop) | |
| 530 { | |
| 531 gimple last; | |
| 532 basic_block bb; | |
| 533 edge exit; | |
| 534 | |
| 535 if (!single_pred_p (loop->latch)) | |
| 536 return NULL; | |
| 537 | |
| 538 bb = single_pred (loop->latch); | |
| 539 last = last_stmt (bb); | |
| 540 if (!last | |
| 541 || gimple_code (last) != GIMPLE_COND) | |
| 542 return NULL; | |
| 543 | |
| 544 exit = EDGE_SUCC (bb, 0); | |
| 545 if (exit->dest == loop->latch) | |
| 546 exit = EDGE_SUCC (bb, 1); | |
| 547 | |
| 548 if (flow_bb_inside_loop_p (loop, exit->dest)) | |
| 549 return NULL; | |
| 550 | |
| 551 return bb; | |
| 552 } | |
| 553 | |
| 554 /* Stores the standard position for induction variable increment in LOOP | |
| 555 (just before the exit condition if it is available and latch block is empty, | |
| 556 end of the latch block otherwise) to BSI. INSERT_AFTER is set to true if | |
| 557 the increment should be inserted after *BSI. */ | |
| 558 | |
| 559 void | |
| 560 standard_iv_increment_position (struct loop *loop, gimple_stmt_iterator *bsi, | |
| 561 bool *insert_after) | |
| 562 { | |
| 563 basic_block bb = ip_normal_pos (loop), latch = ip_end_pos (loop); | |
| 564 gimple last = last_stmt (latch); | |
| 565 | |
| 566 if (!bb | |
| 567 || (last && gimple_code (last) != GIMPLE_LABEL)) | |
| 568 { | |
| 569 *bsi = gsi_last_bb (latch); | |
| 570 *insert_after = true; | |
| 571 } | |
| 572 else | |
| 573 { | |
| 574 *bsi = gsi_last_bb (bb); | |
| 575 *insert_after = false; | |
| 576 } | |
| 577 } | |
| 578 | |
| 579 /* Copies phi node arguments for duplicated blocks. The index of the first | |
| 580 duplicated block is FIRST_NEW_BLOCK. */ | |
| 581 | |
| 582 static void | |
| 583 copy_phi_node_args (unsigned first_new_block) | |
| 584 { | |
| 585 unsigned i; | |
| 586 | |
| 587 for (i = first_new_block; i < (unsigned) last_basic_block; i++) | |
| 588 BASIC_BLOCK (i)->flags |= BB_DUPLICATED; | |
| 589 | |
| 590 for (i = first_new_block; i < (unsigned) last_basic_block; i++) | |
| 591 add_phi_args_after_copy_bb (BASIC_BLOCK (i)); | |
| 592 | |
| 593 for (i = first_new_block; i < (unsigned) last_basic_block; i++) | |
| 594 BASIC_BLOCK (i)->flags &= ~BB_DUPLICATED; | |
| 595 } | |
| 596 | |
| 597 | |
| 598 /* The same as cfgloopmanip.c:duplicate_loop_to_header_edge, but also | |
| 599 updates the PHI nodes at start of the copied region. In order to | |
| 600 achieve this, only loops whose exits all lead to the same location | |
| 601 are handled. | |
| 602 | |
| 603 Notice that we do not completely update the SSA web after | |
| 604 duplication. The caller is responsible for calling update_ssa | |
| 605 after the loop has been duplicated. */ | |
| 606 | |
| 607 bool | |
| 608 gimple_duplicate_loop_to_header_edge (struct loop *loop, edge e, | |
| 609 unsigned int ndupl, sbitmap wont_exit, | |
| 610 edge orig, VEC (edge, heap) **to_remove, | |
| 611 int flags) | |
| 612 { | |
| 613 unsigned first_new_block; | |
| 614 | |
| 615 if (!loops_state_satisfies_p (LOOPS_HAVE_SIMPLE_LATCHES)) | |
| 616 return false; | |
| 617 if (!loops_state_satisfies_p (LOOPS_HAVE_PREHEADERS)) | |
| 618 return false; | |
| 619 | |
| 620 #ifdef ENABLE_CHECKING | |
| 621 if (loops_state_satisfies_p (LOOP_CLOSED_SSA)) | |
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622 verify_loop_closed_ssa (true); |
| 0 | 623 #endif |
| 624 | |
| 625 first_new_block = last_basic_block; | |
| 626 if (!duplicate_loop_to_header_edge (loop, e, ndupl, wont_exit, | |
| 627 orig, to_remove, flags)) | |
| 628 return false; | |
| 629 | |
| 630 /* Readd the removed phi args for e. */ | |
| 631 flush_pending_stmts (e); | |
| 632 | |
| 633 /* Copy the phi node arguments. */ | |
| 634 copy_phi_node_args (first_new_block); | |
| 635 | |
| 636 scev_reset (); | |
| 637 | |
| 638 return true; | |
| 639 } | |
| 640 | |
| 641 /* Returns true if we can unroll LOOP FACTOR times. Number | |
| 642 of iterations of the loop is returned in NITER. */ | |
| 643 | |
| 644 bool | |
| 645 can_unroll_loop_p (struct loop *loop, unsigned factor, | |
| 646 struct tree_niter_desc *niter) | |
| 647 { | |
| 648 edge exit; | |
| 649 | |
| 650 /* Check whether unrolling is possible. We only want to unroll loops | |
| 651 for that we are able to determine number of iterations. We also | |
| 652 want to split the extra iterations of the loop from its end, | |
| 653 therefore we require that the loop has precisely one | |
| 654 exit. */ | |
| 655 | |
| 656 exit = single_dom_exit (loop); | |
| 657 if (!exit) | |
| 658 return false; | |
| 659 | |
| 660 if (!number_of_iterations_exit (loop, exit, niter, false) | |
| 661 || niter->cmp == ERROR_MARK | |
| 662 /* Scalar evolutions analysis might have copy propagated | |
| 663 the abnormal ssa names into these expressions, hence | |
| 664 emitting the computations based on them during loop | |
| 665 unrolling might create overlapping life ranges for | |
| 666 them, and failures in out-of-ssa. */ | |
| 667 || contains_abnormal_ssa_name_p (niter->may_be_zero) | |
| 668 || contains_abnormal_ssa_name_p (niter->control.base) | |
| 669 || contains_abnormal_ssa_name_p (niter->control.step) | |
| 670 || contains_abnormal_ssa_name_p (niter->bound)) | |
| 671 return false; | |
| 672 | |
| 673 /* And of course, we must be able to duplicate the loop. */ | |
| 674 if (!can_duplicate_loop_p (loop)) | |
| 675 return false; | |
| 676 | |
| 677 /* The final loop should be small enough. */ | |
| 678 if (tree_num_loop_insns (loop, &eni_size_weights) * factor | |
| 679 > (unsigned) PARAM_VALUE (PARAM_MAX_UNROLLED_INSNS)) | |
| 680 return false; | |
| 681 | |
| 682 return true; | |
| 683 } | |
| 684 | |
| 685 /* Determines the conditions that control execution of LOOP unrolled FACTOR | |
| 686 times. DESC is number of iterations of LOOP. ENTER_COND is set to | |
| 687 condition that must be true if the main loop can be entered. | |
| 688 EXIT_BASE, EXIT_STEP, EXIT_CMP and EXIT_BOUND are set to values describing | |
| 689 how the exit from the unrolled loop should be controlled. */ | |
| 690 | |
| 691 static void | |
| 692 determine_exit_conditions (struct loop *loop, struct tree_niter_desc *desc, | |
| 693 unsigned factor, tree *enter_cond, | |
| 694 tree *exit_base, tree *exit_step, | |
| 695 enum tree_code *exit_cmp, tree *exit_bound) | |
| 696 { | |
| 697 gimple_seq stmts; | |
| 698 tree base = desc->control.base; | |
| 699 tree step = desc->control.step; | |
| 700 tree bound = desc->bound; | |
| 701 tree type = TREE_TYPE (step); | |
| 702 tree bigstep, delta; | |
| 703 tree min = lower_bound_in_type (type, type); | |
| 704 tree max = upper_bound_in_type (type, type); | |
| 705 enum tree_code cmp = desc->cmp; | |
| 706 tree cond = boolean_true_node, assum; | |
| 707 | |
| 708 /* For pointers, do the arithmetics in the type of step (sizetype). */ | |
| 709 base = fold_convert (type, base); | |
| 710 bound = fold_convert (type, bound); | |
| 711 | |
| 712 *enter_cond = boolean_false_node; | |
| 713 *exit_base = NULL_TREE; | |
| 714 *exit_step = NULL_TREE; | |
| 715 *exit_cmp = ERROR_MARK; | |
| 716 *exit_bound = NULL_TREE; | |
| 717 gcc_assert (cmp != ERROR_MARK); | |
| 718 | |
| 719 /* We only need to be correct when we answer question | |
| 720 "Do at least FACTOR more iterations remain?" in the unrolled loop. | |
| 721 Thus, transforming BASE + STEP * i <> BOUND to | |
| 722 BASE + STEP * i < BOUND is ok. */ | |
| 723 if (cmp == NE_EXPR) | |
| 724 { | |
| 725 if (tree_int_cst_sign_bit (step)) | |
| 726 cmp = GT_EXPR; | |
| 727 else | |
| 728 cmp = LT_EXPR; | |
| 729 } | |
| 730 else if (cmp == LT_EXPR) | |
| 731 { | |
| 732 gcc_assert (!tree_int_cst_sign_bit (step)); | |
| 733 } | |
| 734 else if (cmp == GT_EXPR) | |
| 735 { | |
| 736 gcc_assert (tree_int_cst_sign_bit (step)); | |
| 737 } | |
| 738 else | |
| 739 gcc_unreachable (); | |
| 740 | |
| 741 /* The main body of the loop may be entered iff: | |
| 742 | |
| 743 1) desc->may_be_zero is false. | |
| 744 2) it is possible to check that there are at least FACTOR iterations | |
| 745 of the loop, i.e., BOUND - step * FACTOR does not overflow. | |
| 746 3) # of iterations is at least FACTOR */ | |
| 747 | |
| 748 if (!integer_zerop (desc->may_be_zero)) | |
| 749 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, | |
| 750 invert_truthvalue (desc->may_be_zero), | |
| 751 cond); | |
| 752 | |
| 753 bigstep = fold_build2 (MULT_EXPR, type, step, | |
| 754 build_int_cst_type (type, factor)); | |
| 755 delta = fold_build2 (MINUS_EXPR, type, bigstep, step); | |
| 756 if (cmp == LT_EXPR) | |
| 757 assum = fold_build2 (GE_EXPR, boolean_type_node, | |
| 758 bound, | |
| 759 fold_build2 (PLUS_EXPR, type, min, delta)); | |
| 760 else | |
| 761 assum = fold_build2 (LE_EXPR, boolean_type_node, | |
| 762 bound, | |
| 763 fold_build2 (PLUS_EXPR, type, max, delta)); | |
| 764 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, assum, cond); | |
| 765 | |
| 766 bound = fold_build2 (MINUS_EXPR, type, bound, delta); | |
| 767 assum = fold_build2 (cmp, boolean_type_node, base, bound); | |
| 768 cond = fold_build2 (TRUTH_AND_EXPR, boolean_type_node, assum, cond); | |
| 769 | |
| 770 cond = force_gimple_operand (unshare_expr (cond), &stmts, false, NULL_TREE); | |
| 771 if (stmts) | |
| 772 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
| 773 /* cond now may be a gimple comparison, which would be OK, but also any | |
| 774 other gimple rhs (say a && b). In this case we need to force it to | |
| 775 operand. */ | |
| 776 if (!is_gimple_condexpr (cond)) | |
| 777 { | |
| 778 cond = force_gimple_operand (cond, &stmts, true, NULL_TREE); | |
| 779 if (stmts) | |
| 780 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
| 781 } | |
| 782 *enter_cond = cond; | |
| 783 | |
| 784 base = force_gimple_operand (unshare_expr (base), &stmts, true, NULL_TREE); | |
| 785 if (stmts) | |
| 786 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
| 787 bound = force_gimple_operand (unshare_expr (bound), &stmts, true, NULL_TREE); | |
| 788 if (stmts) | |
| 789 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); | |
| 790 | |
| 791 *exit_base = base; | |
| 792 *exit_step = bigstep; | |
| 793 *exit_cmp = cmp; | |
| 794 *exit_bound = bound; | |
| 795 } | |
| 796 | |
| 797 /* Scales the frequencies of all basic blocks in LOOP that are strictly | |
| 798 dominated by BB by NUM/DEN. */ | |
| 799 | |
| 800 static void | |
| 801 scale_dominated_blocks_in_loop (struct loop *loop, basic_block bb, | |
| 802 int num, int den) | |
| 803 { | |
| 804 basic_block son; | |
| 805 | |
| 806 if (den == 0) | |
| 807 return; | |
| 808 | |
| 809 for (son = first_dom_son (CDI_DOMINATORS, bb); | |
| 810 son; | |
| 811 son = next_dom_son (CDI_DOMINATORS, son)) | |
| 812 { | |
| 813 if (!flow_bb_inside_loop_p (loop, son)) | |
| 814 continue; | |
| 815 scale_bbs_frequencies_int (&son, 1, num, den); | |
| 816 scale_dominated_blocks_in_loop (loop, son, num, den); | |
| 817 } | |
| 818 } | |
| 819 | |
| 820 /* Unroll LOOP FACTOR times. DESC describes number of iterations of LOOP. | |
| 821 EXIT is the exit of the loop to that DESC corresponds. | |
| 822 | |
| 823 If N is number of iterations of the loop and MAY_BE_ZERO is the condition | |
| 824 under that loop exits in the first iteration even if N != 0, | |
|
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825 |
| 0 | 826 while (1) |
| 827 { | |
| 828 x = phi (init, next); | |
| 829 | |
| 830 pre; | |
| 831 if (st) | |
| 832 break; | |
| 833 post; | |
| 834 } | |
| 835 | |
| 836 becomes (with possibly the exit conditions formulated a bit differently, | |
| 837 avoiding the need to create a new iv): | |
|
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838 |
| 0 | 839 if (MAY_BE_ZERO || N < FACTOR) |
| 840 goto rest; | |
| 841 | |
| 842 do | |
| 843 { | |
| 844 x = phi (init, next); | |
| 845 | |
| 846 pre; | |
| 847 post; | |
| 848 pre; | |
| 849 post; | |
| 850 ... | |
| 851 pre; | |
| 852 post; | |
| 853 N -= FACTOR; | |
|
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854 |
| 0 | 855 } while (N >= FACTOR); |
| 856 | |
| 857 rest: | |
| 858 init' = phi (init, x); | |
| 859 | |
| 860 while (1) | |
| 861 { | |
| 862 x = phi (init', next); | |
| 863 | |
| 864 pre; | |
| 865 if (st) | |
| 866 break; | |
| 867 post; | |
| 868 } | |
|
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869 |
| 0 | 870 Before the loop is unrolled, TRANSFORM is called for it (only for the |
| 871 unrolled loop, but not for its versioned copy). DATA is passed to | |
| 872 TRANSFORM. */ | |
| 873 | |
| 874 /* Probability in % that the unrolled loop is entered. Just a guess. */ | |
| 875 #define PROB_UNROLLED_LOOP_ENTERED 90 | |
| 876 | |
| 877 void | |
| 878 tree_transform_and_unroll_loop (struct loop *loop, unsigned factor, | |
| 879 edge exit, struct tree_niter_desc *desc, | |
| 880 transform_callback transform, | |
| 881 void *data) | |
| 882 { | |
| 883 gimple exit_if; | |
| 884 tree ctr_before, ctr_after; | |
| 885 tree enter_main_cond, exit_base, exit_step, exit_bound; | |
| 886 enum tree_code exit_cmp; | |
| 887 gimple phi_old_loop, phi_new_loop, phi_rest; | |
| 888 gimple_stmt_iterator psi_old_loop, psi_new_loop; | |
| 889 tree init, next, new_init, var; | |
| 890 struct loop *new_loop; | |
| 891 basic_block rest, exit_bb; | |
| 892 edge old_entry, new_entry, old_latch, precond_edge, new_exit; | |
| 893 edge new_nonexit, e; | |
| 894 gimple_stmt_iterator bsi; | |
| 895 use_operand_p op; | |
| 896 bool ok; | |
| 897 unsigned est_niter, prob_entry, scale_unrolled, scale_rest, freq_e, freq_h; | |
| 898 unsigned new_est_niter, i, prob; | |
| 899 unsigned irr = loop_preheader_edge (loop)->flags & EDGE_IRREDUCIBLE_LOOP; | |
| 900 sbitmap wont_exit; | |
| 901 VEC (edge, heap) *to_remove = NULL; | |
| 902 | |
| 903 est_niter = expected_loop_iterations (loop); | |
| 904 determine_exit_conditions (loop, desc, factor, | |
| 905 &enter_main_cond, &exit_base, &exit_step, | |
| 906 &exit_cmp, &exit_bound); | |
| 907 | |
| 908 /* Let us assume that the unrolled loop is quite likely to be entered. */ | |
| 909 if (integer_nonzerop (enter_main_cond)) | |
| 910 prob_entry = REG_BR_PROB_BASE; | |
| 911 else | |
| 912 prob_entry = PROB_UNROLLED_LOOP_ENTERED * REG_BR_PROB_BASE / 100; | |
| 913 | |
| 914 /* The values for scales should keep profile consistent, and somewhat close | |
| 915 to correct. | |
| 916 | |
| 917 TODO: The current value of SCALE_REST makes it appear that the loop that | |
| 918 is created by splitting the remaining iterations of the unrolled loop is | |
| 919 executed the same number of times as the original loop, and with the same | |
| 920 frequencies, which is obviously wrong. This does not appear to cause | |
| 921 problems, so we do not bother with fixing it for now. To make the profile | |
| 922 correct, we would need to change the probability of the exit edge of the | |
| 923 loop, and recompute the distribution of frequencies in its body because | |
| 924 of this change (scale the frequencies of blocks before and after the exit | |
| 925 by appropriate factors). */ | |
| 926 scale_unrolled = prob_entry; | |
| 927 scale_rest = REG_BR_PROB_BASE; | |
| 928 | |
| 929 new_loop = loop_version (loop, enter_main_cond, NULL, | |
| 930 prob_entry, scale_unrolled, scale_rest, true); | |
| 931 gcc_assert (new_loop != NULL); | |
| 932 update_ssa (TODO_update_ssa); | |
| 933 | |
| 934 /* Determine the probability of the exit edge of the unrolled loop. */ | |
| 935 new_est_niter = est_niter / factor; | |
| 936 | |
| 937 /* Without profile feedback, loops for that we do not know a better estimate | |
| 938 are assumed to roll 10 times. When we unroll such loop, it appears to | |
| 939 roll too little, and it may even seem to be cold. To avoid this, we | |
| 940 ensure that the created loop appears to roll at least 5 times (but at | |
| 941 most as many times as before unrolling). */ | |
| 942 if (new_est_niter < 5) | |
| 943 { | |
| 944 if (est_niter < 5) | |
| 945 new_est_niter = est_niter; | |
| 946 else | |
| 947 new_est_niter = 5; | |
| 948 } | |
| 949 | |
| 950 /* Prepare the cfg and update the phi nodes. Move the loop exit to the | |
| 951 loop latch (and make its condition dummy, for the moment). */ | |
| 952 rest = loop_preheader_edge (new_loop)->src; | |
| 953 precond_edge = single_pred_edge (rest); | |
| 954 split_edge (loop_latch_edge (loop)); | |
| 955 exit_bb = single_pred (loop->latch); | |
| 956 | |
| 957 /* Since the exit edge will be removed, the frequency of all the blocks | |
| 958 in the loop that are dominated by it must be scaled by | |
| 959 1 / (1 - exit->probability). */ | |
| 960 scale_dominated_blocks_in_loop (loop, exit->src, | |
| 961 REG_BR_PROB_BASE, | |
| 962 REG_BR_PROB_BASE - exit->probability); | |
| 963 | |
| 964 bsi = gsi_last_bb (exit_bb); | |
| 965 exit_if = gimple_build_cond (EQ_EXPR, integer_zero_node, | |
| 966 integer_zero_node, | |
| 967 NULL_TREE, NULL_TREE); | |
| 968 | |
| 969 gsi_insert_after (&bsi, exit_if, GSI_NEW_STMT); | |
| 970 new_exit = make_edge (exit_bb, rest, EDGE_FALSE_VALUE | irr); | |
| 971 rescan_loop_exit (new_exit, true, false); | |
| 972 | |
| 973 /* Set the probability of new exit to the same of the old one. Fix | |
| 974 the frequency of the latch block, by scaling it back by | |
| 975 1 - exit->probability. */ | |
| 976 new_exit->count = exit->count; | |
| 977 new_exit->probability = exit->probability; | |
| 978 new_nonexit = single_pred_edge (loop->latch); | |
| 979 new_nonexit->probability = REG_BR_PROB_BASE - exit->probability; | |
| 980 new_nonexit->flags = EDGE_TRUE_VALUE; | |
| 981 new_nonexit->count -= exit->count; | |
| 982 if (new_nonexit->count < 0) | |
| 983 new_nonexit->count = 0; | |
| 984 scale_bbs_frequencies_int (&loop->latch, 1, new_nonexit->probability, | |
| 985 REG_BR_PROB_BASE); | |
| 986 | |
| 987 old_entry = loop_preheader_edge (loop); | |
| 988 new_entry = loop_preheader_edge (new_loop); | |
| 989 old_latch = loop_latch_edge (loop); | |
| 990 for (psi_old_loop = gsi_start_phis (loop->header), | |
| 991 psi_new_loop = gsi_start_phis (new_loop->header); | |
| 992 !gsi_end_p (psi_old_loop); | |
| 993 gsi_next (&psi_old_loop), gsi_next (&psi_new_loop)) | |
| 994 { | |
| 995 phi_old_loop = gsi_stmt (psi_old_loop); | |
| 996 phi_new_loop = gsi_stmt (psi_new_loop); | |
| 997 | |
| 998 init = PHI_ARG_DEF_FROM_EDGE (phi_old_loop, old_entry); | |
| 999 op = PHI_ARG_DEF_PTR_FROM_EDGE (phi_new_loop, new_entry); | |
| 1000 gcc_assert (operand_equal_for_phi_arg_p (init, USE_FROM_PTR (op))); | |
| 1001 next = PHI_ARG_DEF_FROM_EDGE (phi_old_loop, old_latch); | |
| 1002 | |
| 1003 /* Prefer using original variable as a base for the new ssa name. | |
| 1004 This is necessary for virtual ops, and useful in order to avoid | |
| 1005 losing debug info for real ops. */ | |
|
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1006 if (TREE_CODE (next) == SSA_NAME |
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1007 && useless_type_conversion_p (TREE_TYPE (next), |
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1008 TREE_TYPE (init))) |
| 0 | 1009 var = SSA_NAME_VAR (next); |
|
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1010 else if (TREE_CODE (init) == SSA_NAME |
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1011 && useless_type_conversion_p (TREE_TYPE (init), |
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1012 TREE_TYPE (next))) |
| 0 | 1013 var = SSA_NAME_VAR (init); |
|
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1014 else if (useless_type_conversion_p (TREE_TYPE (next), TREE_TYPE (init))) |
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1015 { |
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1016 var = create_tmp_var (TREE_TYPE (next), "unrinittmp"); |
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1017 add_referenced_var (var); |
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1018 } |
| 0 | 1019 else |
| 1020 { | |
| 1021 var = create_tmp_var (TREE_TYPE (init), "unrinittmp"); | |
| 1022 add_referenced_var (var); | |
| 1023 } | |
| 1024 | |
| 1025 new_init = make_ssa_name (var, NULL); | |
| 1026 phi_rest = create_phi_node (new_init, rest); | |
| 1027 SSA_NAME_DEF_STMT (new_init) = phi_rest; | |
| 1028 | |
|
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1029 add_phi_arg (phi_rest, init, precond_edge, UNKNOWN_LOCATION); |
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1030 add_phi_arg (phi_rest, next, new_exit, UNKNOWN_LOCATION); |
| 0 | 1031 SET_USE (op, new_init); |
| 1032 } | |
| 1033 | |
| 1034 remove_path (exit); | |
| 1035 | |
| 1036 /* Transform the loop. */ | |
| 1037 if (transform) | |
| 1038 (*transform) (loop, data); | |
| 1039 | |
| 1040 /* Unroll the loop and remove the exits in all iterations except for the | |
| 1041 last one. */ | |
| 1042 wont_exit = sbitmap_alloc (factor); | |
| 1043 sbitmap_ones (wont_exit); | |
| 1044 RESET_BIT (wont_exit, factor - 1); | |
| 1045 | |
| 1046 ok = gimple_duplicate_loop_to_header_edge | |
| 1047 (loop, loop_latch_edge (loop), factor - 1, | |
| 1048 wont_exit, new_exit, &to_remove, DLTHE_FLAG_UPDATE_FREQ); | |
| 1049 free (wont_exit); | |
| 1050 gcc_assert (ok); | |
| 1051 | |
|
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1052 FOR_EACH_VEC_ELT (edge, to_remove, i, e) |
| 0 | 1053 { |
| 1054 ok = remove_path (e); | |
| 1055 gcc_assert (ok); | |
| 1056 } | |
| 1057 VEC_free (edge, heap, to_remove); | |
| 1058 update_ssa (TODO_update_ssa); | |
| 1059 | |
| 1060 /* Ensure that the frequencies in the loop match the new estimated | |
| 1061 number of iterations, and change the probability of the new | |
| 1062 exit edge. */ | |
| 1063 freq_h = loop->header->frequency; | |
| 1064 freq_e = EDGE_FREQUENCY (loop_preheader_edge (loop)); | |
| 1065 if (freq_h != 0) | |
| 1066 scale_loop_frequencies (loop, freq_e * (new_est_niter + 1), freq_h); | |
| 1067 | |
| 1068 exit_bb = single_pred (loop->latch); | |
| 1069 new_exit = find_edge (exit_bb, rest); | |
| 1070 new_exit->count = loop_preheader_edge (loop)->count; | |
| 1071 new_exit->probability = REG_BR_PROB_BASE / (new_est_niter + 1); | |
| 1072 | |
| 1073 rest->count += new_exit->count; | |
| 1074 rest->frequency += EDGE_FREQUENCY (new_exit); | |
| 1075 | |
| 1076 new_nonexit = single_pred_edge (loop->latch); | |
| 1077 prob = new_nonexit->probability; | |
| 1078 new_nonexit->probability = REG_BR_PROB_BASE - new_exit->probability; | |
| 1079 new_nonexit->count = exit_bb->count - new_exit->count; | |
| 1080 if (new_nonexit->count < 0) | |
| 1081 new_nonexit->count = 0; | |
| 1082 if (prob > 0) | |
| 1083 scale_bbs_frequencies_int (&loop->latch, 1, new_nonexit->probability, | |
| 1084 prob); | |
| 1085 | |
| 1086 /* Finally create the new counter for number of iterations and add the new | |
| 1087 exit instruction. */ | |
|
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1088 bsi = gsi_last_nondebug_bb (exit_bb); |
| 0 | 1089 exit_if = gsi_stmt (bsi); |
| 1090 create_iv (exit_base, exit_step, NULL_TREE, loop, | |
| 1091 &bsi, false, &ctr_before, &ctr_after); | |
| 1092 gimple_cond_set_code (exit_if, exit_cmp); | |
| 1093 gimple_cond_set_lhs (exit_if, ctr_after); | |
| 1094 gimple_cond_set_rhs (exit_if, exit_bound); | |
| 1095 update_stmt (exit_if); | |
| 1096 | |
| 1097 #ifdef ENABLE_CHECKING | |
| 1098 verify_flow_info (); | |
| 1099 verify_dominators (CDI_DOMINATORS); | |
| 1100 verify_loop_structure (); | |
|
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1101 verify_loop_closed_ssa (true); |
| 0 | 1102 #endif |
| 1103 } | |
| 1104 | |
| 1105 /* Wrapper over tree_transform_and_unroll_loop for case we do not | |
| 1106 want to transform the loop before unrolling. The meaning | |
| 1107 of the arguments is the same as for tree_transform_and_unroll_loop. */ | |
| 1108 | |
| 1109 void | |
| 1110 tree_unroll_loop (struct loop *loop, unsigned factor, | |
| 1111 edge exit, struct tree_niter_desc *desc) | |
| 1112 { | |
| 1113 tree_transform_and_unroll_loop (loop, factor, exit, desc, | |
| 1114 NULL, NULL); | |
| 1115 } | |
|
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1116 |
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1117 /* Rewrite the phi node at position PSI in function of the main |
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1118 induction variable MAIN_IV and insert the generated code at GSI. */ |
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1119 |
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1120 static void |
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1121 rewrite_phi_with_iv (loop_p loop, |
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1122 gimple_stmt_iterator *psi, |
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1123 gimple_stmt_iterator *gsi, |
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1124 tree main_iv) |
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1125 { |
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1126 affine_iv iv; |
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1127 gimple stmt, phi = gsi_stmt (*psi); |
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1128 tree atype, mtype, val, res = PHI_RESULT (phi); |
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1129 |
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1130 if (!is_gimple_reg (res) || res == main_iv) |
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1131 { |
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1132 gsi_next (psi); |
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1133 return; |
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1134 } |
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1135 |
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1136 if (!simple_iv (loop, loop, res, &iv, true)) |
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1137 { |
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1138 gsi_next (psi); |
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1139 return; |
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1140 } |
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1141 |
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1142 remove_phi_node (psi, false); |
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1143 |
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1144 atype = TREE_TYPE (res); |
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1145 mtype = POINTER_TYPE_P (atype) ? sizetype : atype; |
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1146 val = fold_build2 (MULT_EXPR, mtype, unshare_expr (iv.step), |
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1147 fold_convert (mtype, main_iv)); |
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1148 val = fold_build2 (POINTER_TYPE_P (atype) |
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1149 ? POINTER_PLUS_EXPR : PLUS_EXPR, |
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1150 atype, unshare_expr (iv.base), val); |
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1151 val = force_gimple_operand_gsi (gsi, val, false, NULL_TREE, true, |
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1152 GSI_SAME_STMT); |
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1153 stmt = gimple_build_assign (res, val); |
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1154 gsi_insert_before (gsi, stmt, GSI_SAME_STMT); |
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1155 SSA_NAME_DEF_STMT (res) = stmt; |
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1156 } |
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1157 |
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1158 /* Rewrite all the phi nodes of LOOP in function of the main induction |
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1159 variable MAIN_IV. */ |
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1160 |
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1161 static void |
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1162 rewrite_all_phi_nodes_with_iv (loop_p loop, tree main_iv) |
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1163 { |
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1164 unsigned i; |
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1165 basic_block *bbs = get_loop_body_in_dom_order (loop); |
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1166 gimple_stmt_iterator psi; |
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1167 |
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1168 for (i = 0; i < loop->num_nodes; i++) |
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1169 { |
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1170 basic_block bb = bbs[i]; |
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1171 gimple_stmt_iterator gsi = gsi_after_labels (bb); |
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1172 |
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1173 if (bb->loop_father != loop) |
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1174 continue; |
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1175 |
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1176 for (psi = gsi_start_phis (bb); !gsi_end_p (psi); ) |
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1177 rewrite_phi_with_iv (loop, &psi, &gsi, main_iv); |
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1178 } |
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1179 |
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1180 free (bbs); |
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1181 } |
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1182 |
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1183 /* Bases all the induction variables in LOOP on a single induction |
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1184 variable (unsigned with base 0 and step 1), whose final value is |
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1185 compared with *NIT. When the IV type precision has to be larger |
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1186 than *NIT type precision, *NIT is converted to the larger type, the |
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1187 conversion code is inserted before the loop, and *NIT is updated to |
|
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1188 the new definition. When BUMP_IN_LATCH is true, the induction |
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1189 variable is incremented in the loop latch, otherwise it is |
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1190 incremented in the loop header. Return the induction variable that |
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1191 was created. */ |
|
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1192 |
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1193 tree |
|
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1194 canonicalize_loop_ivs (struct loop *loop, tree *nit, bool bump_in_latch) |
|
55
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1195 { |
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1196 unsigned precision = TYPE_PRECISION (TREE_TYPE (*nit)); |
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1197 unsigned original_precision = precision; |
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1198 tree type, var_before; |
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1199 gimple_stmt_iterator gsi, psi; |
|
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1200 gimple stmt; |
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1201 edge exit = single_dom_exit (loop); |
|
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1202 gimple_seq stmts; |
|
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1203 |
|
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|
1204 for (psi = gsi_start_phis (loop->header); |
|
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1205 !gsi_end_p (psi); gsi_next (&psi)) |
|
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|
1206 { |
|
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|
1207 gimple phi = gsi_stmt (psi); |
|
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|
1208 tree res = PHI_RESULT (phi); |
|
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|
1209 |
|
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1210 if (is_gimple_reg (res) && TYPE_PRECISION (TREE_TYPE (res)) > precision) |
|
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|
1211 precision = TYPE_PRECISION (TREE_TYPE (res)); |
|
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1212 } |
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1213 |
|
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1214 type = lang_hooks.types.type_for_size (precision, 1); |
|
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|
1215 |
|
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|
1216 if (original_precision != precision) |
|
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1217 { |
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1218 *nit = fold_convert (type, *nit); |
|
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|
1219 *nit = force_gimple_operand (*nit, &stmts, true, NULL_TREE); |
|
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|
1220 if (stmts) |
|
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|
1221 gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts); |
|
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1222 } |
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|
1223 |
|
67
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|
1224 if (bump_in_latch) |
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1225 gsi = gsi_last_bb (loop->latch); |
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1226 else |
|
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1227 gsi = gsi_last_nondebug_bb (loop->header); |
|
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1228 create_iv (build_int_cst_type (type, 0), build_int_cst (type, 1), NULL_TREE, |
|
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1229 loop, &gsi, bump_in_latch, &var_before, NULL); |
|
55
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1230 |
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1231 rewrite_all_phi_nodes_with_iv (loop, var_before); |
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1232 |
|
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1233 stmt = last_stmt (exit->src); |
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1234 /* Make the loop exit if the control condition is not satisfied. */ |
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1235 if (exit->flags & EDGE_TRUE_VALUE) |
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1236 { |
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1237 edge te, fe; |
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1238 |
|
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1239 extract_true_false_edges_from_block (exit->src, &te, &fe); |
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1240 te->flags = EDGE_FALSE_VALUE; |
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1241 fe->flags = EDGE_TRUE_VALUE; |
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1242 } |
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1243 gimple_cond_set_code (stmt, LT_EXPR); |
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1244 gimple_cond_set_lhs (stmt, var_before); |
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1245 gimple_cond_set_rhs (stmt, *nit); |
|
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1246 update_stmt (stmt); |
|
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1247 |
|
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1248 return var_before; |
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1249 } |