Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-ter.c @ 75:3c5ea37d9068
update gcc to gcc-4.6
| author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 22 Aug 2011 04:01:01 +0900 |
| parents | f6334be47118 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Routines for performing Temporary Expression Replacement (TER) in SSA trees. |
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2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
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3 Free Software Foundation, Inc. |
| 0 | 4 Contributed by Andrew MacLeod <amacleod@redhat.com> |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify | |
| 9 it under the terms of the GNU General Public License as published by | |
| 10 the Free Software Foundation; either version 3, or (at your option) | |
| 11 any later version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, | |
| 14 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 GNU General Public License for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 | |
| 23 #include "config.h" | |
| 24 #include "system.h" | |
| 25 #include "coretypes.h" | |
| 26 #include "tm.h" | |
| 27 #include "tree.h" | |
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28 #include "tree-pretty-print.h" |
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29 #include "gimple-pretty-print.h" |
| 0 | 30 #include "bitmap.h" |
| 31 #include "tree-flow.h" | |
| 32 #include "tree-dump.h" | |
| 33 #include "tree-ssa-live.h" | |
| 34 #include "flags.h" | |
| 35 | |
| 36 | |
| 37 /* Temporary Expression Replacement (TER) | |
| 38 | |
| 39 Replace SSA version variables during out-of-ssa with their defining | |
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40 expression if there is only one use of the variable. |
| 0 | 41 |
| 42 This pass is required in order for the RTL expansion pass to see larger | |
| 43 chunks of code. This allows it to make better choices on RTL pattern | |
| 44 selection. When expand is rewritten and merged with out-of-ssa, and | |
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45 understands SSA, this should be eliminated. |
| 0 | 46 |
| 47 A pass is made through the function, one block at a time. No cross block | |
| 48 information is tracked. | |
| 49 | |
| 50 Variables which only have one use, and whose defining stmt is considered | |
| 51 a replaceable expression (see is_replaceable_p) are tracked to see whether | |
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52 they can be replaced at their use location. |
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53 |
| 0 | 54 n_12 = C * 10 |
| 55 a_2 = b_5 + 6 | |
| 56 v_9 = a_2 * n_12 | |
| 57 | |
| 58 if there are the only use of n_12 and a_2, TER will substitute in their | |
| 59 expressions in v_9, and end up with: | |
| 60 | |
| 61 v_9 = (b_5 + 6) * (C * 10) | |
| 62 | |
| 63 which will then have the ssa_name assigned to regular variables, and the | |
| 64 resulting code which will be passed to the expander looks something like: | |
| 65 | |
| 66 v = (b + 6) * (C * 10) | |
| 67 | |
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68 |
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69 This requires ensuring that none of the variables used by the expression |
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70 change between the def point and where it is used. Furthermore, if any |
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71 of the ssa_names used in this expression are themselves replaceable, we |
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72 have to ensure none of that expressions' arguments change either. |
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73 Although SSA_NAMES themselves don't change, this pass is performed after |
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74 coalescing has coalesced different SSA_NAMES together, so there could be a |
| 0 | 75 definition of an SSA_NAME which is coalesced with a use that causes a |
| 76 problem, i.e., | |
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77 |
| 0 | 78 PHI b_5 = <b_8(2), b_14(1)> |
| 79 <...> | |
| 80 a_2 = b_5 + 6 | |
| 81 b_8 = c_4 + 4 | |
| 82 v_9 = a_2 * n_12 | |
| 83 <...> | |
| 84 | |
| 85 If b_5, b_8 and b_14 are all coalesced together... | |
| 86 The expression b_5 + 6 CANNOT replace the use in the statement defining v_9 | |
| 87 because b_8 is in fact killing the value of b_5 since they share a partition | |
| 88 and will be assigned the same memory or register location. | |
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89 |
| 0 | 90 TER implements this but stepping through the instructions in a block and |
| 91 tracking potential expressions for replacement, and the partitions they are | |
| 92 dependent on. Expressions are represented by the SSA_NAME_VERSION of the | |
| 93 DEF on the LHS of a GIMPLE_ASSIGN and the expression is the RHS. | |
| 94 | |
| 95 When a stmt is determined to be a possible replacement expression, the | |
| 96 following steps are taken: | |
| 97 | |
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98 EXPR_DECL_UID bitmap is allocated and set to the base variable UID of the |
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99 def and any uses in the expression. non-NULL means the expression is being |
| 0 | 100 tracked. The UID's themselves are used to prevent TER substitution into |
| 101 accumulating sequences, i.e., | |
| 102 | |
| 103 x = x + y | |
| 104 x = x + z | |
| 105 x = x + w | |
| 106 etc. | |
| 107 this can result in very large expressions which don't accomplish anything | |
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108 see PR tree-optimization/17549. |
| 0 | 109 |
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110 PARTITION_DEPENDENCIES is another bitmap array, and it has a bit set for any |
| 0 | 111 partition which is used in the expression. This is primarily used to remove |
| 112 an expression from the partition kill lists when a decision is made whether | |
| 113 to replace it or not. This is indexed by ssa version number as well, and | |
| 114 indicates a partition number. virtual operands are not tracked individually, | |
| 115 but they are summarized by an artificial partition called VIRTUAL_PARTITION. | |
| 116 This means a MAY or MUST def will kill *ALL* expressions that are dependent | |
| 117 on a virtual operand. | |
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118 Note that the EXPR_DECL_UID and this bitmap represent very similar |
| 0 | 119 information, but the info in one is not easy to obtain from the other. |
| 120 | |
| 121 KILL_LIST is yet another bitmap array, this time it is indexed by partition | |
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122 number, and represents a list of active expressions which will will no |
| 0 | 123 longer be valid if a definition into this partition takes place. |
| 124 | |
| 125 PARTITION_IN_USE is simply a bitmap which is used to track which partitions | |
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126 currently have something in their kill list. This is used at the end of |
| 0 | 127 a block to clear out the KILL_LIST bitmaps at the end of each block. |
| 128 | |
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129 NEW_REPLACEABLE_DEPENDENCIES is used as a temporary place to store |
| 0 | 130 dependencies which will be reused by the current definition. All the uses |
| 131 on an expression are processed before anything else is done. If a use is | |
| 132 determined to be a replaceable expression AND the current stmt is also going | |
| 133 to be replaceable, all the dependencies of this replaceable use will be | |
| 134 picked up by the current stmt's expression. Rather than recreate them, they | |
| 135 are simply copied here and then copied into the new expression when it is | |
| 136 processed. | |
| 137 | |
| 138 a_2 = b_5 + 6 | |
| 139 v_8 = a_2 + c_4 | |
| 140 | |
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141 a_2's expression 'b_5 + 6' is determined to be replaceable at the use |
| 0 | 142 location. It is dependent on the partition 'b_5' is in. This is cached into |
| 143 the NEW_REPLACEABLE_DEPENDENCIES bitmap, and when v_8 is examined for | |
| 144 replaceability, it is a candidate, and it is dependent on the partition | |
| 145 b_5 is in *NOT* a_2, as well as c_4's partition. | |
| 146 | |
| 147 if v_8 is also replaceable: | |
| 148 | |
| 149 x_9 = v_8 * 5 | |
| 150 | |
| 151 x_9 is dependent on partitions b_5, and c_4 | |
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152 |
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153 if a statement is found which has either of those partitions written to |
| 0 | 154 before x_9 is used, then x_9 itself is NOT replaceable. */ |
| 155 | |
| 156 | |
| 157 /* Temporary Expression Replacement (TER) table information. */ | |
| 158 | |
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159 typedef struct temp_expr_table_d |
| 0 | 160 { |
| 161 var_map map; | |
| 162 bitmap *partition_dependencies; /* Partitions expr is dependent on. */ | |
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163 bitmap replaceable_expressions; /* Replacement expression table. */ |
| 0 | 164 bitmap *expr_decl_uids; /* Base uids of exprs. */ |
| 165 bitmap *kill_list; /* Expr's killed by a partition. */ | |
| 166 int virtual_partition; /* Pseudo partition for virtual ops. */ | |
| 167 bitmap partition_in_use; /* Partitions with kill entries. */ | |
| 168 bitmap new_replaceable_dependencies; /* Holding place for pending dep's. */ | |
| 169 int *num_in_part; /* # of ssa_names in a partition. */ | |
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170 int *call_cnt; /* Call count at definition. */ |
| 0 | 171 } *temp_expr_table_p; |
| 172 | |
| 173 /* Used to indicate a dependency on VDEFs. */ | |
| 174 #define VIRTUAL_PARTITION(table) (table->virtual_partition) | |
| 175 | |
| 176 #ifdef ENABLE_CHECKING | |
| 177 extern void debug_ter (FILE *, temp_expr_table_p); | |
| 178 #endif | |
| 179 | |
| 180 | |
| 181 /* Create a new TER table for MAP. */ | |
| 182 | |
| 183 static temp_expr_table_p | |
| 184 new_temp_expr_table (var_map map) | |
| 185 { | |
| 186 temp_expr_table_p t; | |
| 187 unsigned x; | |
| 188 | |
| 189 t = XNEW (struct temp_expr_table_d); | |
| 190 t->map = map; | |
| 191 | |
| 192 t->partition_dependencies = XCNEWVEC (bitmap, num_ssa_names + 1); | |
| 193 t->expr_decl_uids = XCNEWVEC (bitmap, num_ssa_names + 1); | |
| 194 t->kill_list = XCNEWVEC (bitmap, num_var_partitions (map) + 1); | |
| 195 | |
| 196 t->partition_in_use = BITMAP_ALLOC (NULL); | |
| 197 | |
| 198 t->virtual_partition = num_var_partitions (map); | |
| 199 t->new_replaceable_dependencies = BITMAP_ALLOC (NULL); | |
| 200 | |
| 201 t->replaceable_expressions = NULL; | |
| 202 t->num_in_part = XCNEWVEC (int, num_var_partitions (map)); | |
| 203 for (x = 1; x < num_ssa_names; x++) | |
| 204 { | |
| 205 int p; | |
| 206 tree name = ssa_name (x); | |
| 207 if (!name) | |
| 208 continue; | |
| 209 p = var_to_partition (map, name); | |
| 210 if (p != NO_PARTITION) | |
| 211 t->num_in_part[p]++; | |
| 212 } | |
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213 t->call_cnt = XCNEWVEC (int, num_ssa_names + 1); |
| 0 | 214 |
| 215 return t; | |
| 216 } | |
| 217 | |
| 218 | |
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219 /* Free TER table T. If there are valid replacements, return the expression |
| 0 | 220 vector. */ |
| 221 | |
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222 static bitmap |
| 0 | 223 free_temp_expr_table (temp_expr_table_p t) |
| 224 { | |
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225 bitmap ret = NULL; |
| 0 | 226 |
| 227 #ifdef ENABLE_CHECKING | |
| 228 unsigned x; | |
| 229 for (x = 0; x <= num_var_partitions (t->map); x++) | |
| 230 gcc_assert (!t->kill_list[x]); | |
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231 for (x = 0; x < num_ssa_names; x++) |
| 0 | 232 { |
| 233 gcc_assert (t->expr_decl_uids[x] == NULL); | |
| 234 gcc_assert (t->partition_dependencies[x] == NULL); | |
| 235 } | |
| 236 #endif | |
| 237 | |
| 238 BITMAP_FREE (t->partition_in_use); | |
| 239 BITMAP_FREE (t->new_replaceable_dependencies); | |
| 240 | |
| 241 free (t->expr_decl_uids); | |
| 242 free (t->kill_list); | |
| 243 free (t->partition_dependencies); | |
| 244 free (t->num_in_part); | |
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245 free (t->call_cnt); |
| 0 | 246 |
| 247 if (t->replaceable_expressions) | |
| 248 ret = t->replaceable_expressions; | |
| 249 | |
| 250 free (t); | |
| 251 return ret; | |
| 252 } | |
| 253 | |
| 254 | |
| 255 /* Return TRUE if VERSION is to be replaced by an expression in TAB. */ | |
| 256 | |
| 257 static inline bool | |
| 258 version_to_be_replaced_p (temp_expr_table_p tab, int version) | |
| 259 { | |
| 260 if (!tab->replaceable_expressions) | |
| 261 return false; | |
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262 return bitmap_bit_p (tab->replaceable_expressions, version); |
| 0 | 263 } |
| 264 | |
| 265 | |
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266 /* Add partition P to the list if partitions VERSION is dependent on. TAB is |
| 0 | 267 the expression table */ |
| 268 | |
| 269 static inline void | |
| 270 make_dependent_on_partition (temp_expr_table_p tab, int version, int p) | |
| 271 { | |
| 272 if (!tab->partition_dependencies[version]) | |
| 273 tab->partition_dependencies[version] = BITMAP_ALLOC (NULL); | |
| 274 | |
| 275 bitmap_set_bit (tab->partition_dependencies[version], p); | |
| 276 } | |
| 277 | |
| 278 | |
| 279 /* Add VER to the kill list for P. TAB is the expression table */ | |
| 280 | |
| 281 static inline void | |
| 282 add_to_partition_kill_list (temp_expr_table_p tab, int p, int ver) | |
| 283 { | |
| 284 if (!tab->kill_list[p]) | |
| 285 { | |
| 286 tab->kill_list[p] = BITMAP_ALLOC (NULL); | |
| 287 bitmap_set_bit (tab->partition_in_use, p); | |
| 288 } | |
| 289 bitmap_set_bit (tab->kill_list[p], ver); | |
| 290 } | |
| 291 | |
| 292 | |
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293 /* Remove VER from the partition kill list for P. TAB is the expression |
| 0 | 294 table. */ |
| 295 | |
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296 static inline void |
| 0 | 297 remove_from_partition_kill_list (temp_expr_table_p tab, int p, int version) |
| 298 { | |
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299 gcc_checking_assert (tab->kill_list[p]); |
| 0 | 300 bitmap_clear_bit (tab->kill_list[p], version); |
| 301 if (bitmap_empty_p (tab->kill_list[p])) | |
| 302 { | |
| 303 bitmap_clear_bit (tab->partition_in_use, p); | |
| 304 BITMAP_FREE (tab->kill_list[p]); | |
| 305 } | |
| 306 } | |
| 307 | |
| 308 | |
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309 /* Add a dependency between the def of ssa VERSION and VAR. If VAR is |
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310 replaceable by an expression, add a dependence each of the elements of the |
| 0 | 311 expression. These are contained in the new_replaceable list. TAB is the |
| 312 expression table. */ | |
| 313 | |
| 314 static void | |
| 315 add_dependence (temp_expr_table_p tab, int version, tree var) | |
| 316 { | |
| 317 int i; | |
| 318 bitmap_iterator bi; | |
| 319 unsigned x; | |
| 320 | |
| 321 i = SSA_NAME_VERSION (var); | |
| 322 if (version_to_be_replaced_p (tab, i)) | |
| 323 { | |
| 324 if (!bitmap_empty_p (tab->new_replaceable_dependencies)) | |
| 325 { | |
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326 /* Version will now be killed by a write to any partition the |
| 0 | 327 substituted expression would have been killed by. */ |
| 328 EXECUTE_IF_SET_IN_BITMAP (tab->new_replaceable_dependencies, 0, x, bi) | |
| 329 add_to_partition_kill_list (tab, x, version); | |
| 330 | |
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331 /* Rather than set partition_dependencies and in_use lists bit by |
| 0 | 332 bit, simply OR in the new_replaceable_dependencies bits. */ |
| 333 if (!tab->partition_dependencies[version]) | |
| 334 tab->partition_dependencies[version] = BITMAP_ALLOC (NULL); | |
|
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335 bitmap_ior_into (tab->partition_dependencies[version], |
| 0 | 336 tab->new_replaceable_dependencies); |
|
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337 bitmap_ior_into (tab->partition_in_use, |
| 0 | 338 tab->new_replaceable_dependencies); |
| 339 /* It is only necessary to add these once. */ | |
| 340 bitmap_clear (tab->new_replaceable_dependencies); | |
| 341 } | |
| 342 } | |
| 343 else | |
| 344 { | |
| 345 i = var_to_partition (tab->map, var); | |
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346 gcc_checking_assert (i != NO_PARTITION); |
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347 gcc_checking_assert (tab->num_in_part[i] != 0); |
| 0 | 348 /* Only dependencies on ssa_names which are coalesced with something need |
| 349 to be tracked. Partitions with containing only a single SSA_NAME | |
| 350 *cannot* have their value changed. */ | |
| 351 if (tab->num_in_part[i] > 1) | |
| 352 { | |
| 353 add_to_partition_kill_list (tab, i, version); | |
| 354 make_dependent_on_partition (tab, version, i); | |
| 355 } | |
| 356 } | |
| 357 } | |
| 358 | |
| 359 | |
|
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360 /* Return TRUE if expression STMT is suitable for replacement. |
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361 TER is true if is_replaceable_p is called from within TER, false |
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362 when used from within stmt_is_replaceable_p, i.e. EXPAND_INITIALIZER |
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363 expansion. The differences are that with !TER some tests are skipped |
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364 to make it more aggressive (doesn't require the same bb, or for -O0 |
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365 same locus and same BLOCK), on the other side never considers memory |
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366 loads as replaceable, because those don't ever lead into constant |
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367 expressions. */ |
| 0 | 368 |
| 369 static inline bool | |
|
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370 is_replaceable_p (gimple stmt, bool ter) |
| 0 | 371 { |
| 372 use_operand_p use_p; | |
| 373 tree def; | |
| 374 gimple use_stmt; | |
| 375 location_t locus1, locus2; | |
| 376 tree block1, block2; | |
| 377 | |
| 378 /* Only consider modify stmts. */ | |
| 379 if (!is_gimple_assign (stmt)) | |
| 380 return false; | |
| 381 | |
| 382 /* If the statement may throw an exception, it cannot be replaced. */ | |
| 383 if (stmt_could_throw_p (stmt)) | |
| 384 return false; | |
| 385 | |
| 386 /* Punt if there is more than 1 def. */ | |
| 387 def = SINGLE_SSA_TREE_OPERAND (stmt, SSA_OP_DEF); | |
| 388 if (!def) | |
| 389 return false; | |
| 390 | |
| 391 /* Only consider definitions which have a single use. */ | |
| 392 if (!single_imm_use (def, &use_p, &use_stmt)) | |
| 393 return false; | |
| 394 | |
| 395 /* If the use isn't in this block, it wont be replaced either. */ | |
|
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396 if (ter && gimple_bb (use_stmt) != gimple_bb (stmt)) |
| 0 | 397 return false; |
| 398 | |
| 399 locus1 = gimple_location (stmt); | |
| 400 block1 = gimple_block (stmt); | |
| 401 | |
| 402 if (gimple_code (use_stmt) == GIMPLE_PHI) | |
| 403 { | |
| 404 locus2 = 0; | |
| 405 block2 = NULL_TREE; | |
| 406 } | |
| 407 else | |
| 408 { | |
| 409 locus2 = gimple_location (use_stmt); | |
| 410 block2 = gimple_block (use_stmt); | |
| 411 } | |
| 412 | |
| 413 if (!optimize | |
|
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414 && ter |
| 0 | 415 && ((locus1 && locus1 != locus2) || (block1 && block1 != block2))) |
| 416 return false; | |
| 417 | |
| 418 /* Used in this block, but at the TOP of the block, not the end. */ | |
| 419 if (gimple_code (use_stmt) == GIMPLE_PHI) | |
| 420 return false; | |
| 421 | |
| 422 /* There must be no VDEFs. */ | |
|
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423 if (gimple_vdef (stmt)) |
| 0 | 424 return false; |
| 425 | |
| 426 /* Without alias info we can't move around loads. */ | |
|
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427 if ((!optimize || !ter) |
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428 && gimple_assign_single_p (stmt) |
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429 && !is_gimple_val (gimple_assign_rhs1 (stmt))) |
| 0 | 430 return false; |
| 431 | |
| 432 /* Float expressions must go through memory if float-store is on. */ | |
|
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433 if (flag_float_store |
| 0 | 434 && FLOAT_TYPE_P (gimple_expr_type (stmt))) |
| 435 return false; | |
| 436 | |
| 437 /* An assignment with a register variable on the RHS is not | |
| 438 replaceable. */ | |
| 439 if (gimple_assign_rhs_code (stmt) == VAR_DECL | |
| 440 && DECL_HARD_REGISTER (gimple_assign_rhs1 (stmt))) | |
| 441 return false; | |
| 442 | |
| 443 /* No function calls can be replaced. */ | |
| 444 if (is_gimple_call (stmt)) | |
| 445 return false; | |
| 446 | |
| 447 /* Leave any stmt with volatile operands alone as well. */ | |
| 448 if (gimple_has_volatile_ops (stmt)) | |
| 449 return false; | |
| 450 | |
| 451 return true; | |
| 452 } | |
| 453 | |
| 454 | |
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455 /* Variant of is_replaceable_p test for use in EXPAND_INITIALIZER |
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456 expansion. */ |
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457 |
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458 bool |
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459 stmt_is_replaceable_p (gimple stmt) |
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460 { |
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461 return is_replaceable_p (stmt, false); |
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462 } |
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463 |
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464 |
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465 /* This function will remove the expression for VERSION from replacement |
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466 consideration in table TAB. If FREE_EXPR is true, then remove the |
| 0 | 467 expression from consideration as well by freeing the decl uid bitmap. */ |
| 468 | |
| 469 static void | |
| 470 finished_with_expr (temp_expr_table_p tab, int version, bool free_expr) | |
| 471 { | |
| 472 unsigned i; | |
| 473 bitmap_iterator bi; | |
| 474 | |
| 475 /* Remove this expression from its dependent lists. The partition dependence | |
| 476 list is retained and transfered later to whomever uses this version. */ | |
| 477 if (tab->partition_dependencies[version]) | |
| 478 { | |
| 479 EXECUTE_IF_SET_IN_BITMAP (tab->partition_dependencies[version], 0, i, bi) | |
| 480 remove_from_partition_kill_list (tab, i, version); | |
| 481 BITMAP_FREE (tab->partition_dependencies[version]); | |
| 482 } | |
| 483 if (free_expr) | |
| 484 BITMAP_FREE (tab->expr_decl_uids[version]); | |
| 485 } | |
| 486 | |
| 487 | |
| 488 /* Create an expression entry for a replaceable expression. */ | |
| 489 | |
|
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490 static void |
|
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491 process_replaceable (temp_expr_table_p tab, gimple stmt, int call_cnt) |
| 0 | 492 { |
| 493 tree var, def, basevar; | |
| 494 int version; | |
| 495 ssa_op_iter iter; | |
| 496 bitmap def_vars, use_vars; | |
| 497 | |
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498 gcc_checking_assert (is_replaceable_p (stmt, true)); |
| 0 | 499 |
| 500 def = SINGLE_SSA_TREE_OPERAND (stmt, SSA_OP_DEF); | |
| 501 version = SSA_NAME_VERSION (def); | |
| 502 basevar = SSA_NAME_VAR (def); | |
| 503 def_vars = BITMAP_ALLOC (NULL); | |
| 504 | |
| 505 bitmap_set_bit (def_vars, DECL_UID (basevar)); | |
| 506 | |
| 507 /* Add this expression to the dependency list for each use partition. */ | |
| 508 FOR_EACH_SSA_TREE_OPERAND (var, stmt, iter, SSA_OP_USE) | |
| 509 { | |
| 510 int var_version = SSA_NAME_VERSION (var); | |
| 511 | |
| 512 use_vars = tab->expr_decl_uids[var_version]; | |
| 513 add_dependence (tab, version, var); | |
| 514 if (use_vars) | |
| 515 { | |
| 516 bitmap_ior_into (def_vars, use_vars); | |
| 517 BITMAP_FREE (tab->expr_decl_uids[var_version]); | |
| 518 } | |
| 519 else | |
| 520 bitmap_set_bit (def_vars, DECL_UID (SSA_NAME_VAR (var))); | |
| 521 } | |
| 522 tab->expr_decl_uids[version] = def_vars; | |
| 523 | |
| 524 /* If there are VUSES, add a dependence on virtual defs. */ | |
|
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525 if (gimple_vuse (stmt)) |
| 0 | 526 { |
| 527 make_dependent_on_partition (tab, version, VIRTUAL_PARTITION (tab)); | |
| 528 add_to_partition_kill_list (tab, VIRTUAL_PARTITION (tab), version); | |
| 529 } | |
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530 |
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531 tab->call_cnt[version] = call_cnt; |
| 0 | 532 } |
| 533 | |
| 534 | |
| 535 /* This function removes any expression in TAB which is dependent on PARTITION | |
| 536 from consideration, making it not replaceable. */ | |
| 537 | |
| 538 static inline void | |
| 539 kill_expr (temp_expr_table_p tab, int partition) | |
| 540 { | |
| 541 unsigned version; | |
| 542 | |
|
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543 /* Mark every active expr dependent on this var as not replaceable. |
| 0 | 544 finished_with_expr can modify the bitmap, so we can't execute over it. */ |
| 545 while (tab->kill_list[partition]) | |
| 546 { | |
| 547 version = bitmap_first_set_bit (tab->kill_list[partition]); | |
| 548 finished_with_expr (tab, version, true); | |
| 549 } | |
| 550 | |
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551 gcc_checking_assert (!tab->kill_list[partition]); |
| 0 | 552 } |
| 553 | |
| 554 | |
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555 /* This function kills all expressions in TAB which are dependent on virtual |
| 0 | 556 partitions. */ |
| 557 | |
| 558 static inline void | |
| 559 kill_virtual_exprs (temp_expr_table_p tab) | |
| 560 { | |
| 561 kill_expr (tab, VIRTUAL_PARTITION (tab)); | |
| 562 } | |
| 563 | |
| 564 | |
| 565 /* Mark the expression associated with VAR as replaceable, and enter | |
| 566 the defining stmt into the partition_dependencies table TAB. If | |
| 567 MORE_REPLACING is true, accumulate the pending partition dependencies. */ | |
| 568 | |
| 569 static void | |
| 570 mark_replaceable (temp_expr_table_p tab, tree var, bool more_replacing) | |
| 571 { | |
| 572 int version = SSA_NAME_VERSION (var); | |
| 573 | |
| 574 /* Move the dependence list to the pending listpending. */ | |
| 575 if (more_replacing && tab->partition_dependencies[version]) | |
|
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576 bitmap_ior_into (tab->new_replaceable_dependencies, |
| 0 | 577 tab->partition_dependencies[version]); |
| 578 | |
| 579 finished_with_expr (tab, version, !more_replacing); | |
| 580 | |
| 581 /* Set the replaceable expression. */ | |
| 582 if (!tab->replaceable_expressions) | |
|
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583 tab->replaceable_expressions = BITMAP_ALLOC (NULL); |
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584 bitmap_set_bit (tab->replaceable_expressions, version); |
| 0 | 585 } |
| 586 | |
| 587 | |
| 588 /* This function processes basic block BB, and looks for variables which can | |
| 589 be replaced by their expressions. Results are stored in the table TAB. */ | |
| 590 | |
| 591 static void | |
| 592 find_replaceable_in_bb (temp_expr_table_p tab, basic_block bb) | |
| 593 { | |
| 594 gimple_stmt_iterator bsi; | |
| 595 gimple stmt; | |
|
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596 tree def, use, fndecl; |
| 0 | 597 int partition; |
| 598 var_map map = tab->map; | |
| 599 ssa_op_iter iter; | |
| 600 bool stmt_replaceable; | |
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601 int cur_call_cnt = 0; |
| 0 | 602 |
| 603 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi)) | |
| 604 { | |
| 605 stmt = gsi_stmt (bsi); | |
| 606 | |
|
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607 if (is_gimple_debug (stmt)) |
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608 continue; |
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609 |
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610 stmt_replaceable = is_replaceable_p (stmt, true); |
| 0 | 611 |
| 612 /* Determine if this stmt finishes an existing expression. */ | |
| 613 FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_USE) | |
| 614 { | |
| 615 unsigned ver = SSA_NAME_VERSION (use); | |
| 616 | |
| 617 /* If this use is a potential replacement variable, process it. */ | |
| 618 if (tab->expr_decl_uids[ver]) | |
| 619 { | |
| 620 bool same_root_var = false; | |
| 621 ssa_op_iter iter2; | |
| 622 bitmap vars = tab->expr_decl_uids[ver]; | |
| 623 | |
| 624 /* See if the root variables are the same. If they are, we | |
| 625 do not want to do the replacement to avoid problems with | |
| 626 code size, see PR tree-optimization/17549. */ | |
| 627 if (!bitmap_empty_p (vars)) | |
| 628 FOR_EACH_SSA_TREE_OPERAND (def, stmt, iter2, SSA_OP_DEF) | |
| 629 { | |
| 630 if (bitmap_bit_p (vars, DECL_UID (SSA_NAME_VAR (def)))) | |
| 631 { | |
| 632 same_root_var = true; | |
| 633 break; | |
| 634 } | |
| 635 } | |
| 636 | |
|
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637 /* If the stmt does a memory store and the replacement |
|
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638 is a load aliasing it avoid creating overlapping |
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639 assignments which we cannot expand correctly. */ |
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640 if (gimple_vdef (stmt) |
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641 && gimple_assign_single_p (stmt)) |
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642 { |
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643 gimple def_stmt = SSA_NAME_DEF_STMT (use); |
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644 while (is_gimple_assign (def_stmt) |
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645 && gimple_assign_rhs_code (def_stmt) == SSA_NAME) |
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646 def_stmt |
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647 = SSA_NAME_DEF_STMT (gimple_assign_rhs1 (def_stmt)); |
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648 if (gimple_vuse (def_stmt) |
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649 && gimple_assign_single_p (def_stmt) |
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650 && refs_may_alias_p (gimple_assign_lhs (stmt), |
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651 gimple_assign_rhs1 (def_stmt))) |
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652 same_root_var = true; |
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653 } |
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654 |
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655 /* Mark expression as replaceable unless stmt is volatile, or the |
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656 def variable has the same root variable as something in the |
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657 substitution list, or the def and use span a call such that |
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658 we'll expand lifetimes across a call. */ |
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659 if (gimple_has_volatile_ops (stmt) || same_root_var |
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660 || (tab->call_cnt[ver] != cur_call_cnt |
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661 && SINGLE_SSA_USE_OPERAND (SSA_NAME_DEF_STMT (use), SSA_OP_USE) |
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662 == NULL_USE_OPERAND_P)) |
| 0 | 663 finished_with_expr (tab, ver, true); |
| 664 else | |
| 665 mark_replaceable (tab, use, stmt_replaceable); | |
| 666 } | |
| 667 } | |
|
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668 |
| 0 | 669 /* Next, see if this stmt kills off an active expression. */ |
| 670 FOR_EACH_SSA_TREE_OPERAND (def, stmt, iter, SSA_OP_DEF) | |
| 671 { | |
| 672 partition = var_to_partition (map, def); | |
| 673 if (partition != NO_PARTITION && tab->kill_list[partition]) | |
| 674 kill_expr (tab, partition); | |
| 675 } | |
| 676 | |
|
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677 /* Increment counter if this is a non BUILT_IN call. We allow |
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678 replacement over BUILT_IN calls since many will expand to inline |
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679 insns instead of a true call. */ |
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680 if (is_gimple_call (stmt) |
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681 && !((fndecl = gimple_call_fndecl (stmt)) |
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682 && DECL_BUILT_IN (fndecl))) |
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683 cur_call_cnt++; |
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684 |
| 0 | 685 /* Now see if we are creating a new expression or not. */ |
| 686 if (stmt_replaceable) | |
|
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687 process_replaceable (tab, stmt, cur_call_cnt); |
| 0 | 688 |
| 689 /* Free any unused dependency lists. */ | |
| 690 bitmap_clear (tab->new_replaceable_dependencies); | |
| 691 | |
| 692 /* A V_{MAY,MUST}_DEF kills any expression using a virtual operand, | |
| 693 including the current stmt. */ | |
|
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694 if (gimple_vdef (stmt)) |
| 0 | 695 kill_virtual_exprs (tab); |
| 696 } | |
| 697 } | |
| 698 | |
| 699 | |
| 700 /* This function is the driver routine for replacement of temporary expressions | |
|
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701 in the SSA->normal phase, operating on MAP. If there are replaceable |
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702 expressions, a table is returned which maps SSA versions to the |
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703 expressions they should be replaced with. A NULL_TREE indicates no |
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704 replacement should take place. If there are no replacements at all, |
| 0 | 705 NULL is returned by the function, otherwise an expression vector indexed |
| 706 by SSA_NAME version numbers. */ | |
| 707 | |
|
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708 extern bitmap |
| 0 | 709 find_replaceable_exprs (var_map map) |
| 710 { | |
| 711 basic_block bb; | |
| 712 temp_expr_table_p table; | |
|
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713 bitmap ret; |
| 0 | 714 |
| 715 table = new_temp_expr_table (map); | |
| 716 FOR_EACH_BB (bb) | |
| 717 { | |
| 718 find_replaceable_in_bb (table, bb); | |
|
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719 gcc_checking_assert (bitmap_empty_p (table->partition_in_use)); |
| 0 | 720 } |
| 721 | |
| 722 ret = free_temp_expr_table (table); | |
| 723 return ret; | |
|
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724 } |
| 0 | 725 |
| 726 /* Dump TER expression table EXPR to file F. */ | |
| 727 | |
| 728 void | |
|
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729 dump_replaceable_exprs (FILE *f, bitmap expr) |
| 0 | 730 { |
| 731 tree var; | |
| 732 unsigned x; | |
| 733 | |
| 734 fprintf (f, "\nReplacing Expressions\n"); | |
| 735 for (x = 0; x < num_ssa_names; x++) | |
|
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736 if (bitmap_bit_p (expr, x)) |
| 0 | 737 { |
| 738 var = ssa_name (x); | |
| 739 print_generic_expr (f, var, TDF_SLIM); | |
| 740 fprintf (f, " replace with --> "); | |
|
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741 print_gimple_stmt (f, SSA_NAME_DEF_STMT (var), 0, TDF_SLIM); |
| 0 | 742 fprintf (f, "\n"); |
| 743 } | |
| 744 fprintf (f, "\n"); | |
| 745 } | |
| 746 | |
| 747 | |
| 748 #ifdef ENABLE_CHECKING | |
| 749 /* Dump the status of the various tables in the expression table. This is used | |
| 750 exclusively to debug TER. F is the place to send debug info and T is the | |
| 751 table being debugged. */ | |
| 752 | |
|
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753 DEBUG_FUNCTION void |
| 0 | 754 debug_ter (FILE *f, temp_expr_table_p t) |
| 755 { | |
| 756 unsigned x, y; | |
| 757 bitmap_iterator bi; | |
| 758 | |
|
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759 fprintf (f, "\nDumping current state of TER\n virtual partition = %d\n", |
| 0 | 760 VIRTUAL_PARTITION (t)); |
| 761 if (t->replaceable_expressions) | |
| 762 dump_replaceable_exprs (f, t->replaceable_expressions); | |
| 763 fprintf (f, "Currently tracking the following expressions:\n"); | |
| 764 | |
| 765 for (x = 1; x < num_ssa_names; x++) | |
| 766 if (t->expr_decl_uids[x]) | |
| 767 { | |
|
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768 print_generic_expr (f, ssa_name (x), TDF_SLIM); |
| 0 | 769 fprintf (f, " dep-parts : "); |
|
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770 if (t->partition_dependencies[x] |
| 0 | 771 && !bitmap_empty_p (t->partition_dependencies[x])) |
| 772 { | |
| 773 EXECUTE_IF_SET_IN_BITMAP (t->partition_dependencies[x], 0, y, bi) | |
| 774 fprintf (f, "P%d ",y); | |
| 775 } | |
|
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776 fprintf (f, " basedecls: "); |
| 0 | 777 EXECUTE_IF_SET_IN_BITMAP (t->expr_decl_uids[x], 0, y, bi) |
| 778 fprintf (f, "%d ",y); | |
|
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779 fprintf (f, " call_cnt : %d",t->call_cnt[x]); |
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780 fprintf (f, "\n"); |
| 0 | 781 } |
| 782 | |
|
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783 bitmap_print (f, t->partition_in_use, "Partitions in use ", |
| 0 | 784 "\npartition KILL lists:\n"); |
| 785 | |
| 786 for (x = 0; x <= num_var_partitions (t->map); x++) | |
| 787 if (t->kill_list[x]) | |
| 788 { | |
| 789 fprintf (f, "Partition %d : ", x); | |
| 790 EXECUTE_IF_SET_IN_BITMAP (t->kill_list[x], 0, y, bi) | |
| 791 fprintf (f, "_%d ",y); | |
| 792 } | |
| 793 | |
| 794 fprintf (f, "\n----------\n"); | |
| 795 } | |
| 796 #endif |