Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-forwprop.c @ 86:12b3180c7d07
modify calls.c.
| author | Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Thu, 15 Dec 2011 02:37:13 +0900 |
| parents | f6334be47118 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Forward propagation of expressions for single use variables. |
|
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2 Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010, 2011 |
|
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3 Free Software Foundation, Inc. |
| 0 | 4 |
| 5 This file is part of GCC. | |
| 6 | |
| 7 GCC is free software; you can redistribute it and/or modify | |
| 8 it under the terms of the GNU General Public License as published by | |
| 9 the Free Software Foundation; either version 3, or (at your option) | |
| 10 any later version. | |
| 11 | |
| 12 GCC is distributed in the hope that it will be useful, | |
| 13 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 GNU General Public License for more details. | |
| 16 | |
| 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 "timevar.h" | |
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29 #include "tree-pretty-print.h" |
| 0 | 30 #include "tree-flow.h" |
| 31 #include "tree-pass.h" | |
| 32 #include "tree-dump.h" | |
| 33 #include "langhooks.h" | |
| 34 #include "flags.h" | |
| 35 #include "gimple.h" | |
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36 #include "expr.h" |
| 0 | 37 |
| 38 /* This pass propagates the RHS of assignment statements into use | |
| 39 sites of the LHS of the assignment. It's basically a specialized | |
| 40 form of tree combination. It is hoped all of this can disappear | |
| 41 when we have a generalized tree combiner. | |
| 42 | |
| 43 One class of common cases we handle is forward propagating a single use | |
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44 variable into a COND_EXPR. |
| 0 | 45 |
| 46 bb0: | |
| 47 x = a COND b; | |
| 48 if (x) goto ... else goto ... | |
| 49 | |
| 50 Will be transformed into: | |
| 51 | |
| 52 bb0: | |
| 53 if (a COND b) goto ... else goto ... | |
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54 |
| 0 | 55 Similarly for the tests (x == 0), (x != 0), (x == 1) and (x != 1). |
| 56 | |
| 57 Or (assuming c1 and c2 are constants): | |
| 58 | |
| 59 bb0: | |
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60 x = a + c1; |
| 0 | 61 if (x EQ/NEQ c2) goto ... else goto ... |
| 62 | |
| 63 Will be transformed into: | |
| 64 | |
| 65 bb0: | |
| 66 if (a EQ/NEQ (c2 - c1)) goto ... else goto ... | |
| 67 | |
| 68 Similarly for x = a - c1. | |
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69 |
| 0 | 70 Or |
| 71 | |
| 72 bb0: | |
| 73 x = !a | |
| 74 if (x) goto ... else goto ... | |
| 75 | |
| 76 Will be transformed into: | |
| 77 | |
| 78 bb0: | |
| 79 if (a == 0) goto ... else goto ... | |
| 80 | |
| 81 Similarly for the tests (x == 0), (x != 0), (x == 1) and (x != 1). | |
| 82 For these cases, we propagate A into all, possibly more than one, | |
| 83 COND_EXPRs that use X. | |
| 84 | |
| 85 Or | |
| 86 | |
| 87 bb0: | |
| 88 x = (typecast) a | |
| 89 if (x) goto ... else goto ... | |
| 90 | |
| 91 Will be transformed into: | |
| 92 | |
| 93 bb0: | |
| 94 if (a != 0) goto ... else goto ... | |
| 95 | |
| 96 (Assuming a is an integral type and x is a boolean or x is an | |
| 97 integral and a is a boolean.) | |
| 98 | |
| 99 Similarly for the tests (x == 0), (x != 0), (x == 1) and (x != 1). | |
| 100 For these cases, we propagate A into all, possibly more than one, | |
| 101 COND_EXPRs that use X. | |
| 102 | |
| 103 In addition to eliminating the variable and the statement which assigns | |
| 104 a value to the variable, we may be able to later thread the jump without | |
| 105 adding insane complexity in the dominator optimizer. | |
| 106 | |
| 107 Also note these transformations can cascade. We handle this by having | |
| 108 a worklist of COND_EXPR statements to examine. As we make a change to | |
| 109 a statement, we put it back on the worklist to examine on the next | |
| 110 iteration of the main loop. | |
| 111 | |
| 112 A second class of propagation opportunities arises for ADDR_EXPR | |
| 113 nodes. | |
| 114 | |
| 115 ptr = &x->y->z; | |
| 116 res = *ptr; | |
| 117 | |
| 118 Will get turned into | |
| 119 | |
| 120 res = x->y->z; | |
| 121 | |
| 122 Or | |
| 123 ptr = (type1*)&type2var; | |
| 124 res = *ptr | |
| 125 | |
| 126 Will get turned into (if type1 and type2 are the same size | |
| 127 and neither have volatile on them): | |
| 128 res = VIEW_CONVERT_EXPR<type1>(type2var) | |
| 129 | |
| 130 Or | |
| 131 | |
| 132 ptr = &x[0]; | |
| 133 ptr2 = ptr + <constant>; | |
| 134 | |
| 135 Will get turned into | |
| 136 | |
| 137 ptr2 = &x[constant/elementsize]; | |
| 138 | |
| 139 Or | |
| 140 | |
| 141 ptr = &x[0]; | |
| 142 offset = index * element_size; | |
| 143 offset_p = (pointer) offset; | |
| 144 ptr2 = ptr + offset_p | |
| 145 | |
| 146 Will get turned into: | |
| 147 | |
| 148 ptr2 = &x[index]; | |
| 149 | |
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150 Or |
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151 ssa = (int) decl |
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152 res = ssa & 1 |
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153 |
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154 Provided that decl has known alignment >= 2, will get turned into |
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155 |
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156 res = 0 |
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157 |
| 0 | 158 We also propagate casts into SWITCH_EXPR and COND_EXPR conditions to |
| 159 allow us to remove the cast and {NOT_EXPR,NEG_EXPR} into a subsequent | |
| 160 {NOT_EXPR,NEG_EXPR}. | |
| 161 | |
| 162 This will (of course) be extended as other needs arise. */ | |
| 163 | |
| 164 static bool forward_propagate_addr_expr (tree name, tree rhs); | |
| 165 | |
| 166 /* Set to true if we delete EH edges during the optimization. */ | |
| 167 static bool cfg_changed; | |
| 168 | |
| 169 static tree rhs_to_tree (tree type, gimple stmt); | |
| 170 | |
| 171 /* Get the next statement we can propagate NAME's value into skipping | |
| 172 trivial copies. Returns the statement that is suitable as a | |
| 173 propagation destination or NULL_TREE if there is no such one. | |
| 174 This only returns destinations in a single-use chain. FINAL_NAME_P | |
| 175 if non-NULL is written to the ssa name that represents the use. */ | |
| 176 | |
| 177 static gimple | |
| 178 get_prop_dest_stmt (tree name, tree *final_name_p) | |
| 179 { | |
| 180 use_operand_p use; | |
| 181 gimple use_stmt; | |
| 182 | |
| 183 do { | |
| 184 /* If name has multiple uses, bail out. */ | |
| 185 if (!single_imm_use (name, &use, &use_stmt)) | |
| 186 return NULL; | |
| 187 | |
| 188 /* If this is not a trivial copy, we found it. */ | |
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189 if (!gimple_assign_ssa_name_copy_p (use_stmt) |
| 0 | 190 || gimple_assign_rhs1 (use_stmt) != name) |
| 191 break; | |
| 192 | |
| 193 /* Continue searching uses of the copy destination. */ | |
| 194 name = gimple_assign_lhs (use_stmt); | |
| 195 } while (1); | |
| 196 | |
| 197 if (final_name_p) | |
| 198 *final_name_p = name; | |
| 199 | |
| 200 return use_stmt; | |
| 201 } | |
| 202 | |
| 203 /* Get the statement we can propagate from into NAME skipping | |
| 204 trivial copies. Returns the statement which defines the | |
| 205 propagation source or NULL_TREE if there is no such one. | |
| 206 If SINGLE_USE_ONLY is set considers only sources which have | |
| 207 a single use chain up to NAME. If SINGLE_USE_P is non-null, | |
| 208 it is set to whether the chain to NAME is a single use chain | |
| 209 or not. SINGLE_USE_P is not written to if SINGLE_USE_ONLY is set. */ | |
| 210 | |
| 211 static gimple | |
| 212 get_prop_source_stmt (tree name, bool single_use_only, bool *single_use_p) | |
| 213 { | |
| 214 bool single_use = true; | |
| 215 | |
| 216 do { | |
| 217 gimple def_stmt = SSA_NAME_DEF_STMT (name); | |
| 218 | |
| 219 if (!has_single_use (name)) | |
| 220 { | |
| 221 single_use = false; | |
| 222 if (single_use_only) | |
| 223 return NULL; | |
| 224 } | |
| 225 | |
| 226 /* If name is defined by a PHI node or is the default def, bail out. */ | |
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227 if (!is_gimple_assign (def_stmt)) |
| 0 | 228 return NULL; |
| 229 | |
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230 /* If def_stmt is not a simple copy, we possibly found it. */ |
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231 if (!gimple_assign_ssa_name_copy_p (def_stmt)) |
| 0 | 232 { |
| 233 tree rhs; | |
| 234 | |
| 235 if (!single_use_only && single_use_p) | |
| 236 *single_use_p = single_use; | |
| 237 | |
| 238 /* We can look through pointer conversions in the search | |
| 239 for a useful stmt for the comparison folding. */ | |
| 240 rhs = gimple_assign_rhs1 (def_stmt); | |
| 241 if (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (def_stmt)) | |
| 242 && TREE_CODE (rhs) == SSA_NAME | |
| 243 && POINTER_TYPE_P (TREE_TYPE (gimple_assign_lhs (def_stmt))) | |
| 244 && POINTER_TYPE_P (TREE_TYPE (rhs))) | |
| 245 name = rhs; | |
| 246 else | |
| 247 return def_stmt; | |
| 248 } | |
| 249 else | |
| 250 { | |
| 251 /* Continue searching the def of the copy source name. */ | |
| 252 name = gimple_assign_rhs1 (def_stmt); | |
| 253 } | |
| 254 } while (1); | |
| 255 } | |
| 256 | |
| 257 /* Checks if the destination ssa name in DEF_STMT can be used as | |
| 258 propagation source. Returns true if so, otherwise false. */ | |
| 259 | |
| 260 static bool | |
| 261 can_propagate_from (gimple def_stmt) | |
| 262 { | |
| 263 use_operand_p use_p; | |
| 264 ssa_op_iter iter; | |
| 265 | |
| 266 gcc_assert (is_gimple_assign (def_stmt)); | |
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267 |
| 0 | 268 /* If the rhs has side-effects we cannot propagate from it. */ |
| 269 if (gimple_has_volatile_ops (def_stmt)) | |
| 270 return false; | |
| 271 | |
| 272 /* If the rhs is a load we cannot propagate from it. */ | |
| 273 if (TREE_CODE_CLASS (gimple_assign_rhs_code (def_stmt)) == tcc_reference | |
| 274 || TREE_CODE_CLASS (gimple_assign_rhs_code (def_stmt)) == tcc_declaration) | |
| 275 return false; | |
| 276 | |
| 277 /* Constants can be always propagated. */ | |
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278 if (gimple_assign_single_p (def_stmt) |
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279 && is_gimple_min_invariant (gimple_assign_rhs1 (def_stmt))) |
| 0 | 280 return true; |
| 281 | |
| 282 /* We cannot propagate ssa names that occur in abnormal phi nodes. */ | |
| 283 FOR_EACH_SSA_USE_OPERAND (use_p, def_stmt, iter, SSA_OP_USE) | |
| 284 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (USE_FROM_PTR (use_p))) | |
| 285 return false; | |
| 286 | |
| 287 /* If the definition is a conversion of a pointer to a function type, | |
| 288 then we can not apply optimizations as some targets require | |
| 289 function pointers to be canonicalized and in this case this | |
| 290 optimization could eliminate a necessary canonicalization. */ | |
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291 if (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (def_stmt))) |
| 0 | 292 { |
| 293 tree rhs = gimple_assign_rhs1 (def_stmt); | |
| 294 if (POINTER_TYPE_P (TREE_TYPE (rhs)) | |
| 295 && TREE_CODE (TREE_TYPE (TREE_TYPE (rhs))) == FUNCTION_TYPE) | |
| 296 return false; | |
| 297 } | |
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298 |
| 0 | 299 return true; |
| 300 } | |
| 301 | |
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302 /* Remove a copy chain ending in NAME along the defs. |
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303 If NAME was replaced in its only use then this function can be used |
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304 to clean up dead stmts. Returns true if cleanup-cfg has to run. */ |
| 0 | 305 |
| 306 static bool | |
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307 remove_prop_source_from_use (tree name) |
| 0 | 308 { |
| 309 gimple_stmt_iterator gsi; | |
| 310 gimple stmt; | |
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311 bool cfg_changed = false; |
| 0 | 312 |
| 313 do { | |
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314 basic_block bb; |
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315 |
| 0 | 316 if (!has_zero_uses (name)) |
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317 return cfg_changed; |
| 0 | 318 |
| 319 stmt = SSA_NAME_DEF_STMT (name); | |
| 320 gsi = gsi_for_stmt (stmt); | |
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321 bb = gimple_bb (stmt); |
| 0 | 322 release_defs (stmt); |
| 323 gsi_remove (&gsi, true); | |
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324 cfg_changed |= gimple_purge_dead_eh_edges (bb); |
| 0 | 325 |
| 326 name = (gimple_assign_copy_p (stmt)) ? gimple_assign_rhs1 (stmt) : NULL; | |
| 327 } while (name && TREE_CODE (name) == SSA_NAME); | |
| 328 | |
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329 return cfg_changed; |
| 0 | 330 } |
| 331 | |
| 332 /* Return the rhs of a gimple_assign STMT in a form of a single tree, | |
| 333 converted to type TYPE. | |
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334 |
| 0 | 335 This should disappear, but is needed so we can combine expressions and use |
| 336 the fold() interfaces. Long term, we need to develop folding and combine | |
| 337 routines that deal with gimple exclusively . */ | |
| 338 | |
| 339 static tree | |
| 340 rhs_to_tree (tree type, gimple stmt) | |
| 341 { | |
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342 location_t loc = gimple_location (stmt); |
| 0 | 343 enum tree_code code = gimple_assign_rhs_code (stmt); |
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344 if (get_gimple_rhs_class (code) == GIMPLE_TERNARY_RHS) |
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345 return fold_build3_loc (loc, code, type, gimple_assign_rhs1 (stmt), |
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346 gimple_assign_rhs2 (stmt), |
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347 gimple_assign_rhs3 (stmt)); |
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348 else if (get_gimple_rhs_class (code) == GIMPLE_BINARY_RHS) |
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349 return fold_build2_loc (loc, code, type, gimple_assign_rhs1 (stmt), |
| 0 | 350 gimple_assign_rhs2 (stmt)); |
| 351 else if (get_gimple_rhs_class (code) == GIMPLE_UNARY_RHS) | |
| 352 return build1 (code, type, gimple_assign_rhs1 (stmt)); | |
| 353 else if (get_gimple_rhs_class (code) == GIMPLE_SINGLE_RHS) | |
| 354 return gimple_assign_rhs1 (stmt); | |
| 355 else | |
| 356 gcc_unreachable (); | |
| 357 } | |
| 358 | |
| 359 /* Combine OP0 CODE OP1 in the context of a COND_EXPR. Returns | |
| 360 the folded result in a form suitable for COND_EXPR_COND or | |
| 361 NULL_TREE, if there is no suitable simplified form. If | |
| 362 INVARIANT_ONLY is true only gimple_min_invariant results are | |
| 363 considered simplified. */ | |
| 364 | |
| 365 static tree | |
|
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366 combine_cond_expr_cond (location_t loc, enum tree_code code, tree type, |
| 0 | 367 tree op0, tree op1, bool invariant_only) |
| 368 { | |
| 369 tree t; | |
| 370 | |
| 371 gcc_assert (TREE_CODE_CLASS (code) == tcc_comparison); | |
| 372 | |
|
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373 t = fold_binary_loc (loc, code, type, op0, op1); |
| 0 | 374 if (!t) |
| 375 return NULL_TREE; | |
| 376 | |
| 377 /* Require that we got a boolean type out if we put one in. */ | |
| 378 gcc_assert (TREE_CODE (TREE_TYPE (t)) == TREE_CODE (type)); | |
| 379 | |
| 380 /* Canonicalize the combined condition for use in a COND_EXPR. */ | |
| 381 t = canonicalize_cond_expr_cond (t); | |
| 382 | |
| 383 /* Bail out if we required an invariant but didn't get one. */ | |
| 384 if (!t || (invariant_only && !is_gimple_min_invariant (t))) | |
| 385 return NULL_TREE; | |
| 386 | |
| 387 return t; | |
| 388 } | |
| 389 | |
| 390 /* Propagate from the ssa name definition statements of COND_EXPR | |
| 391 in GIMPLE_COND statement STMT into the conditional if that simplifies it. | |
| 392 Returns zero if no statement was changed, one if there were | |
| 393 changes and two if cfg_cleanup needs to run. | |
|
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394 |
| 0 | 395 This must be kept in sync with forward_propagate_into_cond. */ |
| 396 | |
| 397 static int | |
| 398 forward_propagate_into_gimple_cond (gimple stmt) | |
| 399 { | |
|
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400 int did_something = 0; |
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401 location_t loc = gimple_location (stmt); |
| 0 | 402 |
| 403 do { | |
| 404 tree tmp = NULL_TREE; | |
|
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405 tree name = NULL_TREE, rhs0 = NULL_TREE, rhs1 = NULL_TREE; |
| 0 | 406 gimple def_stmt; |
| 407 bool single_use0_p = false, single_use1_p = false; | |
| 408 enum tree_code code = gimple_cond_code (stmt); | |
| 409 | |
| 410 /* We can do tree combining on SSA_NAME and comparison expressions. */ | |
|
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411 if (TREE_CODE_CLASS (gimple_cond_code (stmt)) == tcc_comparison) |
| 0 | 412 { |
| 413 /* For comparisons use the first operand, that is likely to | |
| 414 simplify comparisons against constants. */ | |
|
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415 if (TREE_CODE (gimple_cond_lhs (stmt)) == SSA_NAME) |
| 0 | 416 { |
|
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417 name = gimple_cond_lhs (stmt); |
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418 def_stmt = get_prop_source_stmt (name, false, &single_use0_p); |
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419 if (def_stmt && can_propagate_from (def_stmt)) |
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420 { |
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421 tree op1 = gimple_cond_rhs (stmt); |
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422 rhs0 = rhs_to_tree (TREE_TYPE (op1), def_stmt); |
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423 tmp = combine_cond_expr_cond (loc, code, boolean_type_node, |
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424 rhs0, op1, !single_use0_p); |
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425 } |
| 0 | 426 } |
| 427 /* If that wasn't successful, try the second operand. */ | |
| 428 if (tmp == NULL_TREE | |
| 429 && TREE_CODE (gimple_cond_rhs (stmt)) == SSA_NAME) | |
| 430 { | |
| 431 tree op0 = gimple_cond_lhs (stmt); | |
| 432 name = gimple_cond_rhs (stmt); | |
| 433 def_stmt = get_prop_source_stmt (name, false, &single_use1_p); | |
| 434 if (!def_stmt || !can_propagate_from (def_stmt)) | |
| 435 return did_something; | |
| 436 | |
| 437 rhs1 = rhs_to_tree (TREE_TYPE (op0), def_stmt); | |
|
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438 tmp = combine_cond_expr_cond (loc, code, boolean_type_node, op0, |
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439 rhs1, !single_use1_p); |
| 0 | 440 } |
| 441 /* If that wasn't successful either, try both operands. */ | |
| 442 if (tmp == NULL_TREE | |
| 443 && rhs0 != NULL_TREE | |
| 444 && rhs1 != NULL_TREE) | |
|
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445 tmp = combine_cond_expr_cond (loc, code, boolean_type_node, rhs0, |
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446 fold_convert_loc (loc, |
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447 TREE_TYPE (rhs0), |
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448 rhs1), |
| 0 | 449 !(single_use0_p && single_use1_p)); |
| 450 } | |
| 451 | |
| 452 if (tmp) | |
| 453 { | |
| 454 if (dump_file && tmp) | |
| 455 { | |
| 456 tree cond = build2 (gimple_cond_code (stmt), | |
| 457 boolean_type_node, | |
| 458 gimple_cond_lhs (stmt), | |
| 459 gimple_cond_rhs (stmt)); | |
| 460 fprintf (dump_file, " Replaced '"); | |
| 461 print_generic_expr (dump_file, cond, 0); | |
| 462 fprintf (dump_file, "' with '"); | |
| 463 print_generic_expr (dump_file, tmp, 0); | |
| 464 fprintf (dump_file, "'\n"); | |
| 465 } | |
| 466 | |
| 467 gimple_cond_set_condition_from_tree (stmt, unshare_expr (tmp)); | |
| 468 update_stmt (stmt); | |
| 469 | |
| 470 /* Remove defining statements. */ | |
|
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471 if (remove_prop_source_from_use (name) |
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472 || is_gimple_min_invariant (tmp)) |
| 0 | 473 did_something = 2; |
| 474 else if (did_something == 0) | |
| 475 did_something = 1; | |
| 476 | |
| 477 /* Continue combining. */ | |
| 478 continue; | |
| 479 } | |
| 480 | |
| 481 break; | |
| 482 } while (1); | |
| 483 | |
| 484 return did_something; | |
| 485 } | |
| 486 | |
| 487 | |
| 488 /* Propagate from the ssa name definition statements of COND_EXPR | |
| 489 in the rhs of statement STMT into the conditional if that simplifies it. | |
| 490 Returns zero if no statement was changed, one if there were | |
| 491 changes and two if cfg_cleanup needs to run. | |
| 492 | |
| 493 This must be kept in sync with forward_propagate_into_gimple_cond. */ | |
| 494 | |
| 495 static int | |
| 496 forward_propagate_into_cond (gimple_stmt_iterator *gsi_p) | |
| 497 { | |
| 498 gimple stmt = gsi_stmt (*gsi_p); | |
|
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499 location_t loc = gimple_location (stmt); |
| 0 | 500 int did_something = 0; |
| 501 | |
| 502 do { | |
| 503 tree tmp = NULL_TREE; | |
| 504 tree cond = gimple_assign_rhs1 (stmt); | |
| 505 tree name, rhs0 = NULL_TREE, rhs1 = NULL_TREE; | |
| 506 gimple def_stmt; | |
| 507 bool single_use0_p = false, single_use1_p = false; | |
| 508 | |
| 509 /* We can do tree combining on SSA_NAME and comparison expressions. */ | |
| 510 if (COMPARISON_CLASS_P (cond) | |
| 511 && TREE_CODE (TREE_OPERAND (cond, 0)) == SSA_NAME) | |
| 512 { | |
| 513 /* For comparisons use the first operand, that is likely to | |
| 514 simplify comparisons against constants. */ | |
| 515 name = TREE_OPERAND (cond, 0); | |
| 516 def_stmt = get_prop_source_stmt (name, false, &single_use0_p); | |
| 517 if (def_stmt && can_propagate_from (def_stmt)) | |
| 518 { | |
| 519 tree op1 = TREE_OPERAND (cond, 1); | |
| 520 rhs0 = rhs_to_tree (TREE_TYPE (op1), def_stmt); | |
|
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521 tmp = combine_cond_expr_cond (loc, TREE_CODE (cond), |
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522 boolean_type_node, |
| 0 | 523 rhs0, op1, !single_use0_p); |
| 524 } | |
| 525 /* If that wasn't successful, try the second operand. */ | |
| 526 if (tmp == NULL_TREE | |
| 527 && TREE_CODE (TREE_OPERAND (cond, 1)) == SSA_NAME) | |
| 528 { | |
| 529 tree op0 = TREE_OPERAND (cond, 0); | |
| 530 name = TREE_OPERAND (cond, 1); | |
| 531 def_stmt = get_prop_source_stmt (name, false, &single_use1_p); | |
| 532 if (!def_stmt || !can_propagate_from (def_stmt)) | |
| 533 return did_something; | |
| 534 | |
| 535 rhs1 = rhs_to_tree (TREE_TYPE (op0), def_stmt); | |
|
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536 tmp = combine_cond_expr_cond (loc, TREE_CODE (cond), |
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537 boolean_type_node, |
| 0 | 538 op0, rhs1, !single_use1_p); |
| 539 } | |
| 540 /* If that wasn't successful either, try both operands. */ | |
| 541 if (tmp == NULL_TREE | |
| 542 && rhs0 != NULL_TREE | |
| 543 && rhs1 != NULL_TREE) | |
|
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544 tmp = combine_cond_expr_cond (loc, TREE_CODE (cond), |
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545 boolean_type_node, |
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546 rhs0, |
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547 fold_convert_loc (loc, |
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548 TREE_TYPE (rhs0), |
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549 rhs1), |
| 0 | 550 !(single_use0_p && single_use1_p)); |
| 551 } | |
| 552 else if (TREE_CODE (cond) == SSA_NAME) | |
| 553 { | |
| 554 name = cond; | |
| 555 def_stmt = get_prop_source_stmt (name, true, NULL); | |
| 556 if (def_stmt || !can_propagate_from (def_stmt)) | |
| 557 return did_something; | |
| 558 | |
| 559 rhs0 = gimple_assign_rhs1 (def_stmt); | |
|
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560 tmp = combine_cond_expr_cond (loc, NE_EXPR, boolean_type_node, rhs0, |
| 0 | 561 build_int_cst (TREE_TYPE (rhs0), 0), |
| 562 false); | |
| 563 } | |
| 564 | |
| 565 if (tmp) | |
| 566 { | |
| 567 if (dump_file && tmp) | |
| 568 { | |
| 569 fprintf (dump_file, " Replaced '"); | |
| 570 print_generic_expr (dump_file, cond, 0); | |
| 571 fprintf (dump_file, "' with '"); | |
| 572 print_generic_expr (dump_file, tmp, 0); | |
| 573 fprintf (dump_file, "'\n"); | |
| 574 } | |
| 575 | |
| 576 gimple_assign_set_rhs_from_tree (gsi_p, unshare_expr (tmp)); | |
| 577 stmt = gsi_stmt (*gsi_p); | |
| 578 update_stmt (stmt); | |
| 579 | |
| 580 /* Remove defining statements. */ | |
|
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581 if (remove_prop_source_from_use (name) |
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582 || is_gimple_min_invariant (tmp)) |
| 0 | 583 did_something = 2; |
| 584 else if (did_something == 0) | |
| 585 did_something = 1; | |
| 586 | |
| 587 /* Continue combining. */ | |
| 588 continue; | |
| 589 } | |
| 590 | |
| 591 break; | |
| 592 } while (1); | |
| 593 | |
| 594 return did_something; | |
| 595 } | |
| 596 | |
|
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597 /* We've just substituted an ADDR_EXPR into stmt. Update all the |
| 0 | 598 relevant data structures to match. */ |
| 599 | |
| 600 static void | |
| 601 tidy_after_forward_propagate_addr (gimple stmt) | |
| 602 { | |
| 603 /* We may have turned a trapping insn into a non-trapping insn. */ | |
| 604 if (maybe_clean_or_replace_eh_stmt (stmt, stmt) | |
| 605 && gimple_purge_dead_eh_edges (gimple_bb (stmt))) | |
| 606 cfg_changed = true; | |
| 607 | |
| 608 if (TREE_CODE (gimple_assign_rhs1 (stmt)) == ADDR_EXPR) | |
| 609 recompute_tree_invariant_for_addr_expr (gimple_assign_rhs1 (stmt)); | |
| 610 } | |
| 611 | |
| 612 /* DEF_RHS contains the address of the 0th element in an array. | |
| 613 USE_STMT uses type of DEF_RHS to compute the address of an | |
| 614 arbitrary element within the array. The (variable) byte offset | |
| 615 of the element is contained in OFFSET. | |
| 616 | |
| 617 We walk back through the use-def chains of OFFSET to verify that | |
| 618 it is indeed computing the offset of an element within the array | |
| 619 and extract the index corresponding to the given byte offset. | |
| 620 | |
| 621 We then try to fold the entire address expression into a form | |
| 622 &array[index]. | |
| 623 | |
| 624 If we are successful, we replace the right hand side of USE_STMT | |
| 625 with the new address computation. */ | |
| 626 | |
| 627 static bool | |
| 628 forward_propagate_addr_into_variable_array_index (tree offset, | |
| 629 tree def_rhs, | |
| 630 gimple_stmt_iterator *use_stmt_gsi) | |
| 631 { | |
|
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632 tree index, tunit; |
| 0 | 633 gimple offset_def, use_stmt = gsi_stmt (*use_stmt_gsi); |
|
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634 tree new_rhs, tmp; |
|
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635 |
|
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636 if (TREE_CODE (TREE_OPERAND (def_rhs, 0)) == ARRAY_REF) |
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637 tunit = TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (def_rhs))); |
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638 else if (TREE_CODE (TREE_TYPE (TREE_OPERAND (def_rhs, 0))) == ARRAY_TYPE) |
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639 tunit = TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (TREE_TYPE (def_rhs)))); |
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640 else |
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641 return false; |
|
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642 if (!host_integerp (tunit, 1)) |
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643 return false; |
| 0 | 644 |
| 645 /* Get the offset's defining statement. */ | |
| 646 offset_def = SSA_NAME_DEF_STMT (offset); | |
| 647 | |
| 648 /* Try to find an expression for a proper index. This is either a | |
| 649 multiplication expression by the element size or just the ssa name we came | |
| 650 along in case the element size is one. In that case, however, we do not | |
| 651 allow multiplications because they can be computing index to a higher | |
| 652 level dimension (PR 37861). */ | |
|
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653 if (integer_onep (tunit)) |
| 0 | 654 { |
| 655 if (is_gimple_assign (offset_def) | |
| 656 && gimple_assign_rhs_code (offset_def) == MULT_EXPR) | |
| 657 return false; | |
| 658 | |
| 659 index = offset; | |
| 660 } | |
| 661 else | |
| 662 { | |
| 663 /* The statement which defines OFFSET before type conversion | |
| 664 must be a simple GIMPLE_ASSIGN. */ | |
| 665 if (!is_gimple_assign (offset_def)) | |
| 666 return false; | |
| 667 | |
| 668 /* The RHS of the statement which defines OFFSET must be a | |
|
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669 multiplication of an object by the size of the array elements. |
| 0 | 670 This implicitly verifies that the size of the array elements |
| 671 is constant. */ | |
|
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672 if (gimple_assign_rhs_code (offset_def) == MULT_EXPR |
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673 && TREE_CODE (gimple_assign_rhs2 (offset_def)) == INTEGER_CST |
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674 && tree_int_cst_equal (gimple_assign_rhs2 (offset_def), tunit)) |
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675 { |
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676 /* The first operand to the MULT_EXPR is the desired index. */ |
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677 index = gimple_assign_rhs1 (offset_def); |
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678 } |
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679 /* If we have idx * tunit + CST * tunit re-associate that. */ |
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680 else if ((gimple_assign_rhs_code (offset_def) == PLUS_EXPR |
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681 || gimple_assign_rhs_code (offset_def) == MINUS_EXPR) |
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682 && TREE_CODE (gimple_assign_rhs1 (offset_def)) == SSA_NAME |
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683 && TREE_CODE (gimple_assign_rhs2 (offset_def)) == INTEGER_CST |
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684 && (tmp = div_if_zero_remainder (EXACT_DIV_EXPR, |
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685 gimple_assign_rhs2 (offset_def), |
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686 tunit)) != NULL_TREE) |
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687 { |
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688 gimple offset_def2 = SSA_NAME_DEF_STMT (gimple_assign_rhs1 (offset_def)); |
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689 if (is_gimple_assign (offset_def2) |
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690 && gimple_assign_rhs_code (offset_def2) == MULT_EXPR |
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691 && TREE_CODE (gimple_assign_rhs2 (offset_def2)) == INTEGER_CST |
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692 && tree_int_cst_equal (gimple_assign_rhs2 (offset_def2), tunit)) |
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693 { |
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694 index = fold_build2 (gimple_assign_rhs_code (offset_def), |
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695 TREE_TYPE (offset), |
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696 gimple_assign_rhs1 (offset_def2), tmp); |
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697 } |
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698 else |
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699 return false; |
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700 } |
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701 else |
| 0 | 702 return false; |
| 703 } | |
| 704 | |
| 705 /* Replace the pointer addition with array indexing. */ | |
|
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706 index = force_gimple_operand_gsi (use_stmt_gsi, index, true, NULL_TREE, |
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707 true, GSI_SAME_STMT); |
|
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708 if (TREE_CODE (TREE_OPERAND (def_rhs, 0)) == ARRAY_REF) |
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709 { |
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710 new_rhs = unshare_expr (def_rhs); |
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711 TREE_OPERAND (TREE_OPERAND (new_rhs, 0), 1) = index; |
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712 } |
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713 else |
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714 { |
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715 new_rhs = build4 (ARRAY_REF, TREE_TYPE (TREE_TYPE (TREE_TYPE (def_rhs))), |
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716 unshare_expr (TREE_OPERAND (def_rhs, 0)), |
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717 index, integer_zero_node, NULL_TREE); |
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718 new_rhs = build_fold_addr_expr (new_rhs); |
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719 if (!useless_type_conversion_p (TREE_TYPE (gimple_assign_lhs (use_stmt)), |
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720 TREE_TYPE (new_rhs))) |
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721 { |
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722 new_rhs = force_gimple_operand_gsi (use_stmt_gsi, new_rhs, true, |
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723 NULL_TREE, true, GSI_SAME_STMT); |
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724 new_rhs = fold_convert (TREE_TYPE (gimple_assign_lhs (use_stmt)), |
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725 new_rhs); |
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726 } |
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727 } |
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728 gimple_assign_set_rhs_from_tree (use_stmt_gsi, new_rhs); |
| 0 | 729 use_stmt = gsi_stmt (*use_stmt_gsi); |
| 730 | |
| 731 /* That should have created gimple, so there is no need to | |
| 732 record information to undo the propagation. */ | |
| 733 fold_stmt_inplace (use_stmt); | |
| 734 tidy_after_forward_propagate_addr (use_stmt); | |
| 735 return true; | |
| 736 } | |
| 737 | |
| 738 /* NAME is a SSA_NAME representing DEF_RHS which is of the form | |
| 739 ADDR_EXPR <whatever>. | |
| 740 | |
| 741 Try to forward propagate the ADDR_EXPR into the use USE_STMT. | |
| 742 Often this will allow for removal of an ADDR_EXPR and INDIRECT_REF | |
| 743 node or for recovery of array indexing from pointer arithmetic. | |
| 744 | |
| 745 Return true if the propagation was successful (the propagation can | |
| 746 be not totally successful, yet things may have been changed). */ | |
| 747 | |
| 748 static bool | |
| 749 forward_propagate_addr_expr_1 (tree name, tree def_rhs, | |
| 750 gimple_stmt_iterator *use_stmt_gsi, | |
| 751 bool single_use_p) | |
| 752 { | |
| 753 tree lhs, rhs, rhs2, array_ref; | |
| 754 gimple use_stmt = gsi_stmt (*use_stmt_gsi); | |
| 755 enum tree_code rhs_code; | |
|
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756 bool res = true; |
| 0 | 757 |
| 758 gcc_assert (TREE_CODE (def_rhs) == ADDR_EXPR); | |
| 759 | |
| 760 lhs = gimple_assign_lhs (use_stmt); | |
| 761 rhs_code = gimple_assign_rhs_code (use_stmt); | |
| 762 rhs = gimple_assign_rhs1 (use_stmt); | |
| 763 | |
| 764 /* Trivial cases. The use statement could be a trivial copy or a | |
| 765 useless conversion. Recurse to the uses of the lhs as copyprop does | |
| 766 not copy through different variant pointers and FRE does not catch | |
| 767 all useless conversions. Treat the case of a single-use name and | |
| 768 a conversion to def_rhs type separate, though. */ | |
| 769 if (TREE_CODE (lhs) == SSA_NAME | |
| 770 && ((rhs_code == SSA_NAME && rhs == name) | |
| 771 || CONVERT_EXPR_CODE_P (rhs_code))) | |
| 772 { | |
| 773 /* Only recurse if we don't deal with a single use or we cannot | |
| 774 do the propagation to the current statement. In particular | |
| 775 we can end up with a conversion needed for a non-invariant | |
| 776 address which we cannot do in a single statement. */ | |
| 777 if (!single_use_p | |
| 778 || (!useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (def_rhs)) | |
|
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779 && (!is_gimple_min_invariant (def_rhs) |
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780 || (INTEGRAL_TYPE_P (TREE_TYPE (lhs)) |
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781 && POINTER_TYPE_P (TREE_TYPE (def_rhs)) |
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782 && (TYPE_PRECISION (TREE_TYPE (lhs)) |
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783 > TYPE_PRECISION (TREE_TYPE (def_rhs))))))) |
| 0 | 784 return forward_propagate_addr_expr (lhs, def_rhs); |
| 785 | |
| 786 gimple_assign_set_rhs1 (use_stmt, unshare_expr (def_rhs)); | |
| 787 if (useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (def_rhs))) | |
| 788 gimple_assign_set_rhs_code (use_stmt, TREE_CODE (def_rhs)); | |
| 789 else | |
| 790 gimple_assign_set_rhs_code (use_stmt, NOP_EXPR); | |
| 791 return true; | |
| 792 } | |
| 793 | |
|
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794 /* Propagate through constant pointer adjustments. */ |
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795 if (TREE_CODE (lhs) == SSA_NAME |
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796 && rhs_code == POINTER_PLUS_EXPR |
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797 && rhs == name |
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798 && TREE_CODE (gimple_assign_rhs2 (use_stmt)) == INTEGER_CST) |
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799 { |
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800 tree new_def_rhs; |
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801 /* As we come here with non-invariant addresses in def_rhs we need |
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802 to make sure we can build a valid constant offsetted address |
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803 for further propagation. Simply rely on fold building that |
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804 and check after the fact. */ |
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805 new_def_rhs = fold_build2 (MEM_REF, TREE_TYPE (TREE_TYPE (rhs)), |
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806 def_rhs, |
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807 fold_convert (ptr_type_node, |
|
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808 gimple_assign_rhs2 (use_stmt))); |
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809 if (TREE_CODE (new_def_rhs) == MEM_REF |
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810 && !is_gimple_mem_ref_addr (TREE_OPERAND (new_def_rhs, 0))) |
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811 return false; |
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812 new_def_rhs = build_fold_addr_expr_with_type (new_def_rhs, |
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813 TREE_TYPE (rhs)); |
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814 |
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815 /* Recurse. If we could propagate into all uses of lhs do not |
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816 bother to replace into the current use but just pretend we did. */ |
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817 if (TREE_CODE (new_def_rhs) == ADDR_EXPR |
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818 && forward_propagate_addr_expr (lhs, new_def_rhs)) |
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819 return true; |
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820 |
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821 if (useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (new_def_rhs))) |
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822 gimple_assign_set_rhs_with_ops (use_stmt_gsi, TREE_CODE (new_def_rhs), |
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823 new_def_rhs, NULL_TREE); |
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824 else if (is_gimple_min_invariant (new_def_rhs)) |
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825 gimple_assign_set_rhs_with_ops (use_stmt_gsi, NOP_EXPR, |
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826 new_def_rhs, NULL_TREE); |
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827 else |
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828 return false; |
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829 gcc_assert (gsi_stmt (*use_stmt_gsi) == use_stmt); |
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830 update_stmt (use_stmt); |
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831 return true; |
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832 } |
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833 |
|
55
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834 /* Now strip away any outer COMPONENT_REF/ARRAY_REF nodes from the LHS. |
| 0 | 835 ADDR_EXPR will not appear on the LHS. */ |
|
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836 lhs = gimple_assign_lhs (use_stmt); |
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837 while (handled_component_p (lhs)) |
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838 lhs = TREE_OPERAND (lhs, 0); |
| 0 | 839 |
|
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840 /* Now see if the LHS node is a MEM_REF using NAME. If so, |
| 0 | 841 propagate the ADDR_EXPR into the use of NAME and fold the result. */ |
|
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842 if (TREE_CODE (lhs) == MEM_REF |
|
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843 && TREE_OPERAND (lhs, 0) == name) |
| 0 | 844 { |
|
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845 tree def_rhs_base; |
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846 HOST_WIDE_INT def_rhs_offset; |
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847 /* If the address is invariant we can always fold it. */ |
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848 if ((def_rhs_base = get_addr_base_and_unit_offset (TREE_OPERAND (def_rhs, 0), |
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849 &def_rhs_offset))) |
|
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850 { |
|
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851 double_int off = mem_ref_offset (lhs); |
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852 tree new_ptr; |
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853 off = double_int_add (off, |
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854 shwi_to_double_int (def_rhs_offset)); |
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855 if (TREE_CODE (def_rhs_base) == MEM_REF) |
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856 { |
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857 off = double_int_add (off, mem_ref_offset (def_rhs_base)); |
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858 new_ptr = TREE_OPERAND (def_rhs_base, 0); |
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859 } |
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860 else |
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861 new_ptr = build_fold_addr_expr (def_rhs_base); |
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862 TREE_OPERAND (lhs, 0) = new_ptr; |
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863 TREE_OPERAND (lhs, 1) |
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864 = double_int_to_tree (TREE_TYPE (TREE_OPERAND (lhs, 1)), off); |
|
19
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865 tidy_after_forward_propagate_addr (use_stmt); |
|
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866 /* Continue propagating into the RHS if this was not the only use. */ |
|
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867 if (single_use_p) |
|
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|
868 return true; |
|
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869 } |
|
67
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870 /* If the LHS is a plain dereference and the value type is the same as |
|
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871 that of the pointed-to type of the address we can put the |
|
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872 dereferenced address on the LHS preserving the original alias-type. */ |
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873 else if (gimple_assign_lhs (use_stmt) == lhs |
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874 && useless_type_conversion_p |
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875 (TREE_TYPE (TREE_OPERAND (def_rhs, 0)), |
|
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876 TREE_TYPE (gimple_assign_rhs1 (use_stmt)))) |
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877 { |
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878 tree *def_rhs_basep = &TREE_OPERAND (def_rhs, 0); |
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879 tree new_offset, new_base, saved; |
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880 while (handled_component_p (*def_rhs_basep)) |
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881 def_rhs_basep = &TREE_OPERAND (*def_rhs_basep, 0); |
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882 saved = *def_rhs_basep; |
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883 if (TREE_CODE (*def_rhs_basep) == MEM_REF) |
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884 { |
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885 new_base = TREE_OPERAND (*def_rhs_basep, 0); |
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886 new_offset |
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887 = int_const_binop (PLUS_EXPR, TREE_OPERAND (lhs, 1), |
|
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888 TREE_OPERAND (*def_rhs_basep, 1), 0); |
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889 } |
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890 else |
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891 { |
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892 new_base = build_fold_addr_expr (*def_rhs_basep); |
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893 new_offset = TREE_OPERAND (lhs, 1); |
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894 } |
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895 *def_rhs_basep = build2 (MEM_REF, TREE_TYPE (*def_rhs_basep), |
|
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896 new_base, new_offset); |
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897 gimple_assign_set_lhs (use_stmt, |
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898 unshare_expr (TREE_OPERAND (def_rhs, 0))); |
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899 *def_rhs_basep = saved; |
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900 tidy_after_forward_propagate_addr (use_stmt); |
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901 /* Continue propagating into the RHS if this was not the |
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902 only use. */ |
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903 if (single_use_p) |
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904 return true; |
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|
905 } |
|
19
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diff
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|
906 else |
|
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diff
changeset
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907 /* We can have a struct assignment dereferencing our name twice. |
|
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diff
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|
908 Note that we didn't propagate into the lhs to not falsely |
|
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diff
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|
909 claim we did when propagating into the rhs. */ |
|
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|
910 res = false; |
| 0 | 911 } |
| 912 | |
| 913 /* Strip away any outer COMPONENT_REF, ARRAY_REF or ADDR_EXPR | |
| 914 nodes from the RHS. */ | |
|
67
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915 rhs = gimple_assign_rhs1 (use_stmt); |
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916 if (TREE_CODE (rhs) == ADDR_EXPR) |
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917 rhs = TREE_OPERAND (rhs, 0); |
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918 while (handled_component_p (rhs)) |
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919 rhs = TREE_OPERAND (rhs, 0); |
| 0 | 920 |
|
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921 /* Now see if the RHS node is a MEM_REF using NAME. If so, |
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|
922 propagate the ADDR_EXPR into the use of NAME and fold the result. */ |
|
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923 if (TREE_CODE (rhs) == MEM_REF |
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924 && TREE_OPERAND (rhs, 0) == name) |
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925 { |
|
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|
926 tree def_rhs_base; |
|
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|
927 HOST_WIDE_INT def_rhs_offset; |
|
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|
928 if ((def_rhs_base = get_addr_base_and_unit_offset (TREE_OPERAND (def_rhs, 0), |
|
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|
929 &def_rhs_offset))) |
|
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|
930 { |
|
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|
931 double_int off = mem_ref_offset (rhs); |
|
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|
932 tree new_ptr; |
|
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|
933 off = double_int_add (off, |
|
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|
934 shwi_to_double_int (def_rhs_offset)); |
|
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|
935 if (TREE_CODE (def_rhs_base) == MEM_REF) |
|
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|
936 { |
|
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|
937 off = double_int_add (off, mem_ref_offset (def_rhs_base)); |
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938 new_ptr = TREE_OPERAND (def_rhs_base, 0); |
|
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|
939 } |
|
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|
940 else |
|
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|
941 new_ptr = build_fold_addr_expr (def_rhs_base); |
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942 TREE_OPERAND (rhs, 0) = new_ptr; |
|
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|
943 TREE_OPERAND (rhs, 1) |
|
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944 = double_int_to_tree (TREE_TYPE (TREE_OPERAND (rhs, 1)), off); |
|
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|
945 fold_stmt_inplace (use_stmt); |
|
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|
946 tidy_after_forward_propagate_addr (use_stmt); |
|
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|
947 return res; |
|
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|
948 } |
|
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|
949 /* If the LHS is a plain dereference and the value type is the same as |
|
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|
950 that of the pointed-to type of the address we can put the |
|
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|
951 dereferenced address on the LHS preserving the original alias-type. */ |
|
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|
952 else if (gimple_assign_rhs1 (use_stmt) == rhs |
|
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|
953 && useless_type_conversion_p |
|
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|
954 (TREE_TYPE (gimple_assign_lhs (use_stmt)), |
|
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|
955 TREE_TYPE (TREE_OPERAND (def_rhs, 0)))) |
|
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|
956 { |
|
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|
957 tree *def_rhs_basep = &TREE_OPERAND (def_rhs, 0); |
|
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|
958 tree new_offset, new_base, saved; |
|
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959 while (handled_component_p (*def_rhs_basep)) |
|
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|
960 def_rhs_basep = &TREE_OPERAND (*def_rhs_basep, 0); |
|
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|
961 saved = *def_rhs_basep; |
|
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|
962 if (TREE_CODE (*def_rhs_basep) == MEM_REF) |
|
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|
963 { |
|
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|
964 new_base = TREE_OPERAND (*def_rhs_basep, 0); |
|
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|
965 new_offset |
|
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|
966 = int_const_binop (PLUS_EXPR, TREE_OPERAND (rhs, 1), |
|
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967 TREE_OPERAND (*def_rhs_basep, 1), 0); |
|
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|
968 } |
|
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|
969 else |
|
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|
970 { |
|
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|
971 new_base = build_fold_addr_expr (*def_rhs_basep); |
|
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|
972 new_offset = TREE_OPERAND (rhs, 1); |
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|
973 } |
|
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|
974 *def_rhs_basep = build2 (MEM_REF, TREE_TYPE (*def_rhs_basep), |
|
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|
975 new_base, new_offset); |
|
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|
976 gimple_assign_set_rhs1 (use_stmt, |
|
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|
977 unshare_expr (TREE_OPERAND (def_rhs, 0))); |
|
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|
978 *def_rhs_basep = saved; |
|
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|
979 fold_stmt_inplace (use_stmt); |
|
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|
980 tidy_after_forward_propagate_addr (use_stmt); |
|
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|
981 return res; |
|
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|
982 } |
|
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|
983 } |
| 0 | 984 |
| 985 /* If the use of the ADDR_EXPR is not a POINTER_PLUS_EXPR, there | |
| 986 is nothing to do. */ | |
| 987 if (gimple_assign_rhs_code (use_stmt) != POINTER_PLUS_EXPR | |
| 988 || gimple_assign_rhs1 (use_stmt) != name) | |
| 989 return false; | |
| 990 | |
| 991 /* The remaining cases are all for turning pointer arithmetic into | |
| 992 array indexing. They only apply when we have the address of | |
| 993 element zero in an array. If that is not the case then there | |
| 994 is nothing to do. */ | |
| 995 array_ref = TREE_OPERAND (def_rhs, 0); | |
|
67
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|
996 if ((TREE_CODE (array_ref) != ARRAY_REF |
|
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|
997 || TREE_CODE (TREE_TYPE (TREE_OPERAND (array_ref, 0))) != ARRAY_TYPE |
|
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|
998 || TREE_CODE (TREE_OPERAND (array_ref, 1)) != INTEGER_CST) |
|
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999 && TREE_CODE (TREE_TYPE (array_ref)) != ARRAY_TYPE) |
| 0 | 1000 return false; |
| 1001 | |
| 1002 rhs2 = gimple_assign_rhs2 (use_stmt); | |
|
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1003 /* Try to optimize &x[C1] p+ C2 where C2 is a multiple of the size |
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1004 of the elements in X into &x[C1 + C2/element size]. */ |
| 0 | 1005 if (TREE_CODE (rhs2) == INTEGER_CST) |
| 1006 { | |
|
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1007 tree new_rhs = maybe_fold_stmt_addition (gimple_location (use_stmt), |
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1008 TREE_TYPE (def_rhs), |
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1009 def_rhs, rhs2); |
| 0 | 1010 if (new_rhs) |
| 1011 { | |
|
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1012 tree type = TREE_TYPE (gimple_assign_lhs (use_stmt)); |
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1013 new_rhs = unshare_expr (new_rhs); |
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1014 if (!useless_type_conversion_p (type, TREE_TYPE (new_rhs))) |
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1015 { |
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1016 if (!is_gimple_min_invariant (new_rhs)) |
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1017 new_rhs = force_gimple_operand_gsi (use_stmt_gsi, new_rhs, |
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1018 true, NULL_TREE, |
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1019 true, GSI_SAME_STMT); |
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1020 new_rhs = fold_convert (type, new_rhs); |
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1021 } |
| 0 | 1022 gimple_assign_set_rhs_from_tree (use_stmt_gsi, new_rhs); |
| 1023 use_stmt = gsi_stmt (*use_stmt_gsi); | |
| 1024 update_stmt (use_stmt); | |
| 1025 tidy_after_forward_propagate_addr (use_stmt); | |
| 1026 return true; | |
| 1027 } | |
| 1028 } | |
| 1029 | |
| 1030 /* Try to optimize &x[0] p+ OFFSET where OFFSET is defined by | |
| 1031 converting a multiplication of an index by the size of the | |
| 1032 array elements, then the result is converted into the proper | |
| 1033 type for the arithmetic. */ | |
| 1034 if (TREE_CODE (rhs2) == SSA_NAME | |
|
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1035 && (TREE_CODE (array_ref) != ARRAY_REF |
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1036 || integer_zerop (TREE_OPERAND (array_ref, 1))) |
| 0 | 1037 && useless_type_conversion_p (TREE_TYPE (name), TREE_TYPE (def_rhs)) |
| 1038 /* Avoid problems with IVopts creating PLUS_EXPRs with a | |
| 1039 different type than their operands. */ | |
| 1040 && useless_type_conversion_p (TREE_TYPE (lhs), TREE_TYPE (def_rhs))) | |
| 1041 return forward_propagate_addr_into_variable_array_index (rhs2, def_rhs, | |
| 1042 use_stmt_gsi); | |
| 1043 return false; | |
| 1044 } | |
| 1045 | |
| 1046 /* STMT is a statement of the form SSA_NAME = ADDR_EXPR <whatever>. | |
| 1047 | |
| 1048 Try to forward propagate the ADDR_EXPR into all uses of the SSA_NAME. | |
| 1049 Often this will allow for removal of an ADDR_EXPR and INDIRECT_REF | |
| 1050 node or for recovery of array indexing from pointer arithmetic. | |
| 1051 Returns true, if all uses have been propagated into. */ | |
| 1052 | |
| 1053 static bool | |
| 1054 forward_propagate_addr_expr (tree name, tree rhs) | |
| 1055 { | |
| 1056 int stmt_loop_depth = gimple_bb (SSA_NAME_DEF_STMT (name))->loop_depth; | |
| 1057 imm_use_iterator iter; | |
| 1058 gimple use_stmt; | |
| 1059 bool all = true; | |
| 1060 bool single_use_p = has_single_use (name); | |
| 1061 | |
| 1062 FOR_EACH_IMM_USE_STMT (use_stmt, iter, name) | |
| 1063 { | |
| 1064 bool result; | |
| 1065 tree use_rhs; | |
| 1066 | |
| 1067 /* If the use is not in a simple assignment statement, then | |
| 1068 there is nothing we can do. */ | |
| 1069 if (gimple_code (use_stmt) != GIMPLE_ASSIGN) | |
| 1070 { | |
|
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1071 if (!is_gimple_debug (use_stmt)) |
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1072 all = false; |
| 0 | 1073 continue; |
| 1074 } | |
| 1075 | |
| 1076 /* If the use is in a deeper loop nest, then we do not want | |
|
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1077 to propagate non-invariant ADDR_EXPRs into the loop as that |
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1078 is likely adding expression evaluations into the loop. */ |
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1079 if (gimple_bb (use_stmt)->loop_depth > stmt_loop_depth |
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1080 && !is_gimple_min_invariant (rhs)) |
| 0 | 1081 { |
| 1082 all = false; | |
| 1083 continue; | |
| 1084 } | |
| 1085 | |
| 1086 { | |
| 1087 gimple_stmt_iterator gsi = gsi_for_stmt (use_stmt); | |
| 1088 result = forward_propagate_addr_expr_1 (name, rhs, &gsi, | |
| 1089 single_use_p); | |
|
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1090 /* If the use has moved to a different statement adjust |
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1091 the update machinery for the old statement too. */ |
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1092 if (use_stmt != gsi_stmt (gsi)) |
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1093 { |
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1094 update_stmt (use_stmt); |
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1095 use_stmt = gsi_stmt (gsi); |
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1096 } |
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1097 |
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1098 update_stmt (use_stmt); |
| 0 | 1099 } |
| 1100 all &= result; | |
| 1101 | |
| 1102 /* Remove intermediate now unused copy and conversion chains. */ | |
| 1103 use_rhs = gimple_assign_rhs1 (use_stmt); | |
| 1104 if (result | |
| 1105 && TREE_CODE (gimple_assign_lhs (use_stmt)) == SSA_NAME | |
|
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1106 && TREE_CODE (use_rhs) == SSA_NAME |
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1107 && has_zero_uses (gimple_assign_lhs (use_stmt))) |
| 0 | 1108 { |
| 1109 gimple_stmt_iterator gsi = gsi_for_stmt (use_stmt); | |
| 1110 release_defs (use_stmt); | |
| 1111 gsi_remove (&gsi, true); | |
| 1112 } | |
| 1113 } | |
| 1114 | |
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1115 return all && has_zero_uses (name); |
| 0 | 1116 } |
| 1117 | |
| 1118 /* Forward propagate the comparison defined in STMT like | |
| 1119 cond_1 = x CMP y to uses of the form | |
| 1120 a_1 = (T')cond_1 | |
| 1121 a_1 = !cond_1 | |
| 1122 a_1 = cond_1 != 0 | |
| 1123 Returns true if stmt is now unused. */ | |
| 1124 | |
| 1125 static bool | |
| 1126 forward_propagate_comparison (gimple stmt) | |
| 1127 { | |
| 1128 tree name = gimple_assign_lhs (stmt); | |
| 1129 gimple use_stmt; | |
| 1130 tree tmp = NULL_TREE; | |
| 1131 | |
| 1132 /* Don't propagate ssa names that occur in abnormal phis. */ | |
| 1133 if ((TREE_CODE (gimple_assign_rhs1 (stmt)) == SSA_NAME | |
| 1134 && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_assign_rhs1 (stmt))) | |
| 1135 || (TREE_CODE (gimple_assign_rhs2 (stmt)) == SSA_NAME | |
| 1136 && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_assign_rhs2 (stmt)))) | |
| 1137 return false; | |
| 1138 | |
| 1139 /* Do not un-cse comparisons. But propagate through copies. */ | |
| 1140 use_stmt = get_prop_dest_stmt (name, &name); | |
| 1141 if (!use_stmt) | |
| 1142 return false; | |
| 1143 | |
| 1144 /* Conversion of the condition result to another integral type. */ | |
| 1145 if (is_gimple_assign (use_stmt) | |
| 1146 && (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (use_stmt)) | |
| 1147 || TREE_CODE_CLASS (gimple_assign_rhs_code (use_stmt)) | |
| 1148 == tcc_comparison | |
| 1149 || gimple_assign_rhs_code (use_stmt) == TRUTH_NOT_EXPR) | |
| 1150 && INTEGRAL_TYPE_P (TREE_TYPE (gimple_assign_lhs (use_stmt)))) | |
| 1151 { | |
| 1152 tree lhs = gimple_assign_lhs (use_stmt); | |
| 1153 | |
| 1154 /* We can propagate the condition into a conversion. */ | |
| 1155 if (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (use_stmt))) | |
| 1156 { | |
| 1157 /* Avoid using fold here as that may create a COND_EXPR with | |
| 1158 non-boolean condition as canonical form. */ | |
| 1159 tmp = build2 (gimple_assign_rhs_code (stmt), TREE_TYPE (lhs), | |
| 1160 gimple_assign_rhs1 (stmt), gimple_assign_rhs2 (stmt)); | |
| 1161 } | |
| 1162 /* We can propagate the condition into X op CST where op | |
| 1163 is EQ_EXPR or NE_EXPR and CST is either one or zero. */ | |
| 1164 else if (TREE_CODE_CLASS (gimple_assign_rhs_code (use_stmt)) | |
| 1165 == tcc_comparison | |
| 1166 && TREE_CODE (gimple_assign_rhs1 (use_stmt)) == SSA_NAME | |
| 1167 && TREE_CODE (gimple_assign_rhs2 (use_stmt)) == INTEGER_CST) | |
| 1168 { | |
| 1169 enum tree_code code = gimple_assign_rhs_code (use_stmt); | |
| 1170 tree cst = gimple_assign_rhs2 (use_stmt); | |
| 1171 tree cond; | |
| 1172 | |
| 1173 cond = build2 (gimple_assign_rhs_code (stmt), | |
| 1174 TREE_TYPE (cst), | |
| 1175 gimple_assign_rhs1 (stmt), | |
| 1176 gimple_assign_rhs2 (stmt)); | |
| 1177 | |
|
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1178 tmp = combine_cond_expr_cond (gimple_location (use_stmt), |
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1179 code, TREE_TYPE (lhs), |
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1180 cond, cst, false); |
| 0 | 1181 if (tmp == NULL_TREE) |
| 1182 return false; | |
| 1183 } | |
| 1184 /* We can propagate the condition into a statement that | |
| 1185 computes the logical negation of the comparison result. */ | |
| 1186 else if (gimple_assign_rhs_code (use_stmt) == TRUTH_NOT_EXPR) | |
| 1187 { | |
| 1188 tree type = TREE_TYPE (gimple_assign_rhs1 (stmt)); | |
| 1189 bool nans = HONOR_NANS (TYPE_MODE (type)); | |
| 1190 enum tree_code code; | |
| 1191 code = invert_tree_comparison (gimple_assign_rhs_code (stmt), nans); | |
| 1192 if (code == ERROR_MARK) | |
| 1193 return false; | |
| 1194 | |
| 1195 tmp = build2 (code, TREE_TYPE (lhs), gimple_assign_rhs1 (stmt), | |
| 1196 gimple_assign_rhs2 (stmt)); | |
| 1197 } | |
| 1198 else | |
| 1199 return false; | |
| 1200 | |
| 1201 { | |
| 1202 gimple_stmt_iterator gsi = gsi_for_stmt (use_stmt); | |
| 1203 gimple_assign_set_rhs_from_tree (&gsi, unshare_expr (tmp)); | |
| 1204 use_stmt = gsi_stmt (gsi); | |
| 1205 update_stmt (use_stmt); | |
| 1206 } | |
| 1207 | |
| 1208 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 1209 { | |
| 1210 tree old_rhs = rhs_to_tree (TREE_TYPE (gimple_assign_lhs (stmt)), | |
| 1211 stmt); | |
| 1212 fprintf (dump_file, " Replaced '"); | |
| 1213 print_generic_expr (dump_file, old_rhs, dump_flags); | |
| 1214 fprintf (dump_file, "' with '"); | |
| 1215 print_generic_expr (dump_file, tmp, dump_flags); | |
| 1216 fprintf (dump_file, "'\n"); | |
| 1217 } | |
| 1218 | |
|
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1219 /* Remove defining statements. */ |
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1220 return remove_prop_source_from_use (name); |
| 0 | 1221 } |
| 1222 | |
| 1223 return false; | |
| 1224 } | |
| 1225 | |
| 1226 /* If we have lhs = ~x (STMT), look and see if earlier we had x = ~y. | |
| 1227 If so, we can change STMT into lhs = y which can later be copy | |
|
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1228 propagated. Similarly for negation. |
| 0 | 1229 |
|
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1230 This could trivially be formulated as a forward propagation |
| 0 | 1231 to immediate uses. However, we already had an implementation |
| 1232 from DOM which used backward propagation via the use-def links. | |
| 1233 | |
| 1234 It turns out that backward propagation is actually faster as | |
| 1235 there's less work to do for each NOT/NEG expression we find. | |
| 1236 Backwards propagation needs to look at the statement in a single | |
| 1237 backlink. Forward propagation needs to look at potentially more | |
| 1238 than one forward link. */ | |
| 1239 | |
| 1240 static void | |
| 1241 simplify_not_neg_expr (gimple_stmt_iterator *gsi_p) | |
| 1242 { | |
| 1243 gimple stmt = gsi_stmt (*gsi_p); | |
| 1244 tree rhs = gimple_assign_rhs1 (stmt); | |
| 1245 gimple rhs_def_stmt = SSA_NAME_DEF_STMT (rhs); | |
| 1246 | |
| 1247 /* See if the RHS_DEF_STMT has the same form as our statement. */ | |
| 1248 if (is_gimple_assign (rhs_def_stmt) | |
| 1249 && gimple_assign_rhs_code (rhs_def_stmt) == gimple_assign_rhs_code (stmt)) | |
| 1250 { | |
| 1251 tree rhs_def_operand = gimple_assign_rhs1 (rhs_def_stmt); | |
| 1252 | |
| 1253 /* Verify that RHS_DEF_OPERAND is a suitable SSA_NAME. */ | |
| 1254 if (TREE_CODE (rhs_def_operand) == SSA_NAME | |
| 1255 && ! SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rhs_def_operand)) | |
| 1256 { | |
| 1257 gimple_assign_set_rhs_from_tree (gsi_p, rhs_def_operand); | |
| 1258 stmt = gsi_stmt (*gsi_p); | |
| 1259 update_stmt (stmt); | |
| 1260 } | |
| 1261 } | |
| 1262 } | |
| 1263 | |
| 1264 /* STMT is a SWITCH_EXPR for which we attempt to find equivalent forms of | |
| 1265 the condition which we may be able to optimize better. */ | |
| 1266 | |
| 1267 static void | |
| 1268 simplify_gimple_switch (gimple stmt) | |
| 1269 { | |
| 1270 tree cond = gimple_switch_index (stmt); | |
| 1271 tree def, to, ti; | |
| 1272 gimple def_stmt; | |
| 1273 | |
| 1274 /* The optimization that we really care about is removing unnecessary | |
| 1275 casts. That will let us do much better in propagating the inferred | |
| 1276 constant at the switch target. */ | |
| 1277 if (TREE_CODE (cond) == SSA_NAME) | |
| 1278 { | |
| 1279 def_stmt = SSA_NAME_DEF_STMT (cond); | |
| 1280 if (is_gimple_assign (def_stmt)) | |
| 1281 { | |
| 1282 if (gimple_assign_rhs_code (def_stmt) == NOP_EXPR) | |
| 1283 { | |
| 1284 int need_precision; | |
| 1285 bool fail; | |
| 1286 | |
| 1287 def = gimple_assign_rhs1 (def_stmt); | |
| 1288 | |
| 1289 /* ??? Why was Jeff testing this? We are gimple... */ | |
|
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1290 gcc_checking_assert (is_gimple_val (def)); |
| 0 | 1291 |
| 1292 to = TREE_TYPE (cond); | |
| 1293 ti = TREE_TYPE (def); | |
| 1294 | |
| 1295 /* If we have an extension that preserves value, then we | |
| 1296 can copy the source value into the switch. */ | |
| 1297 | |
| 1298 need_precision = TYPE_PRECISION (ti); | |
| 1299 fail = false; | |
| 1300 if (! INTEGRAL_TYPE_P (ti)) | |
| 1301 fail = true; | |
| 1302 else if (TYPE_UNSIGNED (to) && !TYPE_UNSIGNED (ti)) | |
| 1303 fail = true; | |
| 1304 else if (!TYPE_UNSIGNED (to) && TYPE_UNSIGNED (ti)) | |
| 1305 need_precision += 1; | |
| 1306 if (TYPE_PRECISION (to) < need_precision) | |
| 1307 fail = true; | |
| 1308 | |
| 1309 if (!fail) | |
| 1310 { | |
| 1311 gimple_switch_set_index (stmt, def); | |
| 1312 update_stmt (stmt); | |
| 1313 } | |
| 1314 } | |
| 1315 } | |
| 1316 } | |
| 1317 } | |
| 1318 | |
|
67
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1319 /* For pointers p2 and p1 return p2 - p1 if the |
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1320 difference is known and constant, otherwise return NULL. */ |
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1321 |
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1322 static tree |
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1323 constant_pointer_difference (tree p1, tree p2) |
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1324 { |
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1325 int i, j; |
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1326 #define CPD_ITERATIONS 5 |
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1327 tree exps[2][CPD_ITERATIONS]; |
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1328 tree offs[2][CPD_ITERATIONS]; |
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1329 int cnt[2]; |
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1330 |
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1331 for (i = 0; i < 2; i++) |
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1332 { |
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1333 tree p = i ? p1 : p2; |
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1334 tree off = size_zero_node; |
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1335 gimple stmt; |
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1336 enum tree_code code; |
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1337 |
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1338 /* For each of p1 and p2 we need to iterate at least |
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1339 twice, to handle ADDR_EXPR directly in p1/p2, |
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1340 SSA_NAME with ADDR_EXPR or POINTER_PLUS_EXPR etc. |
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1341 on definition's stmt RHS. Iterate a few extra times. */ |
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1342 j = 0; |
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1343 do |
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1344 { |
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1345 if (!POINTER_TYPE_P (TREE_TYPE (p))) |
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1346 break; |
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1347 if (TREE_CODE (p) == ADDR_EXPR) |
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1348 { |
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1349 tree q = TREE_OPERAND (p, 0); |
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1350 HOST_WIDE_INT offset; |
|
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1351 tree base = get_addr_base_and_unit_offset (q, &offset); |
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1352 if (base) |
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1353 { |
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1354 q = base; |
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1355 if (offset) |
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1356 off = size_binop (PLUS_EXPR, off, size_int (offset)); |
|
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1357 } |
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1358 if (TREE_CODE (q) == MEM_REF |
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1359 && TREE_CODE (TREE_OPERAND (q, 0)) == SSA_NAME) |
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1360 { |
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1361 p = TREE_OPERAND (q, 0); |
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1362 off = size_binop (PLUS_EXPR, off, |
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1363 double_int_to_tree (sizetype, |
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1364 mem_ref_offset (q))); |
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1365 } |
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1366 else |
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1367 { |
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1368 exps[i][j] = q; |
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1369 offs[i][j++] = off; |
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1370 break; |
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1371 } |
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1372 } |
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1373 if (TREE_CODE (p) != SSA_NAME) |
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1374 break; |
|
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1375 exps[i][j] = p; |
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1376 offs[i][j++] = off; |
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1377 if (j == CPD_ITERATIONS) |
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1378 break; |
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1379 stmt = SSA_NAME_DEF_STMT (p); |
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1380 if (!is_gimple_assign (stmt) || gimple_assign_lhs (stmt) != p) |
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1381 break; |
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1382 code = gimple_assign_rhs_code (stmt); |
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1383 if (code == POINTER_PLUS_EXPR) |
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1384 { |
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1385 if (TREE_CODE (gimple_assign_rhs2 (stmt)) != INTEGER_CST) |
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1386 break; |
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1387 off = size_binop (PLUS_EXPR, off, gimple_assign_rhs2 (stmt)); |
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1388 p = gimple_assign_rhs1 (stmt); |
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1389 } |
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1390 else if (code == ADDR_EXPR || code == NOP_EXPR) |
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1391 p = gimple_assign_rhs1 (stmt); |
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1392 else |
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1393 break; |
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1394 } |
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1395 while (1); |
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1396 cnt[i] = j; |
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1397 } |
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1398 |
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1399 for (i = 0; i < cnt[0]; i++) |
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1400 for (j = 0; j < cnt[1]; j++) |
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1401 if (exps[0][i] == exps[1][j]) |
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1402 return size_binop (MINUS_EXPR, offs[0][i], offs[1][j]); |
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1403 |
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1404 return NULL_TREE; |
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1405 } |
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1406 |
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1407 /* *GSI_P is a GIMPLE_CALL to a builtin function. |
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1408 Optimize |
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1409 memcpy (p, "abcd", 4); |
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1410 memset (p + 4, ' ', 3); |
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1411 into |
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1412 memcpy (p, "abcd ", 7); |
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1413 call if the latter can be stored by pieces during expansion. */ |
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1414 |
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1415 static bool |
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1416 simplify_builtin_call (gimple_stmt_iterator *gsi_p, tree callee2) |
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1417 { |
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1418 gimple stmt1, stmt2 = gsi_stmt (*gsi_p); |
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1419 tree vuse = gimple_vuse (stmt2); |
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1420 if (vuse == NULL) |
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1421 return false; |
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1422 stmt1 = SSA_NAME_DEF_STMT (vuse); |
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1423 |
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1424 switch (DECL_FUNCTION_CODE (callee2)) |
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1425 { |
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1426 case BUILT_IN_MEMSET: |
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1427 if (gimple_call_num_args (stmt2) != 3 |
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1428 || gimple_call_lhs (stmt2) |
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1429 || CHAR_BIT != 8 |
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1430 || BITS_PER_UNIT != 8) |
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1431 break; |
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1432 else |
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1433 { |
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1434 tree callee1; |
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1435 tree ptr1, src1, str1, off1, len1, lhs1; |
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1436 tree ptr2 = gimple_call_arg (stmt2, 0); |
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1437 tree val2 = gimple_call_arg (stmt2, 1); |
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1438 tree len2 = gimple_call_arg (stmt2, 2); |
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1439 tree diff, vdef, new_str_cst; |
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1440 gimple use_stmt; |
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1441 unsigned int ptr1_align; |
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1442 unsigned HOST_WIDE_INT src_len; |
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1443 char *src_buf; |
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1444 use_operand_p use_p; |
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1445 |
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1446 if (!host_integerp (val2, 0) |
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1447 || !host_integerp (len2, 1)) |
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|
1448 break; |
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1449 if (is_gimple_call (stmt1)) |
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1450 { |
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1451 /* If first stmt is a call, it needs to be memcpy |
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1452 or mempcpy, with string literal as second argument and |
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1453 constant length. */ |
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1454 callee1 = gimple_call_fndecl (stmt1); |
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1455 if (callee1 == NULL_TREE |
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1456 || DECL_BUILT_IN_CLASS (callee1) != BUILT_IN_NORMAL |
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1457 || gimple_call_num_args (stmt1) != 3) |
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|
1458 break; |
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1459 if (DECL_FUNCTION_CODE (callee1) != BUILT_IN_MEMCPY |
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1460 && DECL_FUNCTION_CODE (callee1) != BUILT_IN_MEMPCPY) |
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|
1461 break; |
|
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1462 ptr1 = gimple_call_arg (stmt1, 0); |
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1463 src1 = gimple_call_arg (stmt1, 1); |
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1464 len1 = gimple_call_arg (stmt1, 2); |
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1465 lhs1 = gimple_call_lhs (stmt1); |
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1466 if (!host_integerp (len1, 1)) |
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|
1467 break; |
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1468 str1 = string_constant (src1, &off1); |
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1469 if (str1 == NULL_TREE) |
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1470 break; |
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1471 if (!host_integerp (off1, 1) |
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1472 || compare_tree_int (off1, TREE_STRING_LENGTH (str1) - 1) > 0 |
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1473 || compare_tree_int (len1, TREE_STRING_LENGTH (str1) |
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1474 - tree_low_cst (off1, 1)) > 0 |
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1475 || TREE_CODE (TREE_TYPE (str1)) != ARRAY_TYPE |
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1476 || TYPE_MODE (TREE_TYPE (TREE_TYPE (str1))) |
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1477 != TYPE_MODE (char_type_node)) |
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|
1478 break; |
|
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|
1479 } |
|
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1480 else if (gimple_assign_single_p (stmt1)) |
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1481 { |
|
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1482 /* Otherwise look for length 1 memcpy optimized into |
|
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1483 assignment. */ |
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1484 ptr1 = gimple_assign_lhs (stmt1); |
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1485 src1 = gimple_assign_rhs1 (stmt1); |
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1486 if (TREE_CODE (ptr1) != MEM_REF |
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1487 || TYPE_MODE (TREE_TYPE (ptr1)) != TYPE_MODE (char_type_node) |
|
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1488 || !host_integerp (src1, 0)) |
|
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|
1489 break; |
|
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1490 ptr1 = build_fold_addr_expr (ptr1); |
|
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1491 callee1 = NULL_TREE; |
|
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1492 len1 = size_one_node; |
|
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|
1493 lhs1 = NULL_TREE; |
|
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1494 off1 = size_zero_node; |
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1495 str1 = NULL_TREE; |
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1496 } |
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1497 else |
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1498 break; |
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1499 |
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1500 diff = constant_pointer_difference (ptr1, ptr2); |
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1501 if (diff == NULL && lhs1 != NULL) |
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1502 { |
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1503 diff = constant_pointer_difference (lhs1, ptr2); |
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1504 if (DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY |
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1505 && diff != NULL) |
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1506 diff = size_binop (PLUS_EXPR, diff, |
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1507 fold_convert (sizetype, len1)); |
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1508 } |
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1509 /* If the difference between the second and first destination pointer |
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1510 is not constant, or is bigger than memcpy length, bail out. */ |
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1511 if (diff == NULL |
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1512 || !host_integerp (diff, 1) |
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1513 || tree_int_cst_lt (len1, diff)) |
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1514 break; |
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1515 |
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1516 /* Use maximum of difference plus memset length and memcpy length |
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1517 as the new memcpy length, if it is too big, bail out. */ |
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1518 src_len = tree_low_cst (diff, 1); |
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1519 src_len += tree_low_cst (len2, 1); |
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1520 if (src_len < (unsigned HOST_WIDE_INT) tree_low_cst (len1, 1)) |
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1521 src_len = tree_low_cst (len1, 1); |
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1522 if (src_len > 1024) |
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1523 break; |
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1524 |
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1525 /* If mempcpy value is used elsewhere, bail out, as mempcpy |
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1526 with bigger length will return different result. */ |
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1527 if (lhs1 != NULL_TREE |
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1528 && DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY |
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1529 && (TREE_CODE (lhs1) != SSA_NAME |
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1530 || !single_imm_use (lhs1, &use_p, &use_stmt) |
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1531 || use_stmt != stmt2)) |
|
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1532 break; |
|
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1533 |
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1534 /* If anything reads memory in between memcpy and memset |
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1535 call, the modified memcpy call might change it. */ |
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1536 vdef = gimple_vdef (stmt1); |
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1537 if (vdef != NULL |
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1538 && (!single_imm_use (vdef, &use_p, &use_stmt) |
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1539 || use_stmt != stmt2)) |
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1540 break; |
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1541 |
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1542 ptr1_align = get_pointer_alignment (ptr1, BIGGEST_ALIGNMENT); |
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1543 /* Construct the new source string literal. */ |
|
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1544 src_buf = XALLOCAVEC (char, src_len + 1); |
|
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|
1545 if (callee1) |
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|
1546 memcpy (src_buf, |
|
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|
1547 TREE_STRING_POINTER (str1) + tree_low_cst (off1, 1), |
|
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|
1548 tree_low_cst (len1, 1)); |
|
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|
1549 else |
|
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|
1550 src_buf[0] = tree_low_cst (src1, 0); |
|
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|
1551 memset (src_buf + tree_low_cst (diff, 1), |
|
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|
1552 tree_low_cst (val2, 1), tree_low_cst (len2, 1)); |
|
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|
1553 src_buf[src_len] = '\0'; |
|
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1554 /* Neither builtin_strncpy_read_str nor builtin_memcpy_read_str |
|
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|
1555 handle embedded '\0's. */ |
|
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|
1556 if (strlen (src_buf) != src_len) |
|
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|
1557 break; |
|
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|
1558 rtl_profile_for_bb (gimple_bb (stmt2)); |
|
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|
1559 /* If the new memcpy wouldn't be emitted by storing the literal |
|
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1560 by pieces, this optimization might enlarge .rodata too much, |
|
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|
1561 as commonly used string literals couldn't be shared any |
|
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|
1562 longer. */ |
|
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1563 if (!can_store_by_pieces (src_len, |
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|
1564 builtin_strncpy_read_str, |
|
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|
1565 src_buf, ptr1_align, false)) |
|
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|
1566 break; |
|
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1567 |
|
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1568 new_str_cst = build_string_literal (src_len, src_buf); |
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|
1569 if (callee1) |
|
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|
1570 { |
|
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1571 /* If STMT1 is a mem{,p}cpy call, adjust it and remove |
|
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|
1572 memset call. */ |
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1573 if (lhs1 && DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY) |
|
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|
1574 gimple_call_set_lhs (stmt1, NULL_TREE); |
|
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1575 gimple_call_set_arg (stmt1, 1, new_str_cst); |
|
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1576 gimple_call_set_arg (stmt1, 2, |
|
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1577 build_int_cst (TREE_TYPE (len1), src_len)); |
|
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1578 update_stmt (stmt1); |
|
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1579 unlink_stmt_vdef (stmt2); |
|
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1580 gsi_remove (gsi_p, true); |
|
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|
1581 release_defs (stmt2); |
|
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|
1582 if (lhs1 && DECL_FUNCTION_CODE (callee1) == BUILT_IN_MEMPCPY) |
|
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|
1583 release_ssa_name (lhs1); |
|
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diff
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|
1584 return true; |
|
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|
1585 } |
|
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diff
changeset
|
1586 else |
|
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diff
changeset
|
1587 { |
|
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63
diff
changeset
|
1588 /* Otherwise, if STMT1 is length 1 memcpy optimized into |
|
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63
diff
changeset
|
1589 assignment, remove STMT1 and change memset call into |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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63
diff
changeset
|
1590 memcpy call. */ |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
1591 gimple_stmt_iterator gsi = gsi_for_stmt (stmt1); |
|
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diff
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|
1592 |
|
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diff
changeset
|
1593 if (!is_gimple_val (ptr1)) |
|
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diff
changeset
|
1594 ptr1 = force_gimple_operand_gsi (gsi_p, ptr1, true, NULL_TREE, |
|
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diff
changeset
|
1595 true, GSI_SAME_STMT); |
|
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diff
changeset
|
1596 gimple_call_set_fndecl (stmt2, built_in_decls [BUILT_IN_MEMCPY]); |
|
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diff
changeset
|
1597 gimple_call_set_arg (stmt2, 0, ptr1); |
|
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diff
changeset
|
1598 gimple_call_set_arg (stmt2, 1, new_str_cst); |
|
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diff
changeset
|
1599 gimple_call_set_arg (stmt2, 2, |
|
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diff
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|
1600 build_int_cst (TREE_TYPE (len2), src_len)); |
|
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changeset
|
1601 unlink_stmt_vdef (stmt1); |
|
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|
1602 gsi_remove (&gsi, true); |
|
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|
1603 release_defs (stmt1); |
|
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changeset
|
1604 update_stmt (stmt2); |
|
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|
1605 return false; |
|
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|
1606 } |
|
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|
1607 } |
|
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|
1608 break; |
|
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changeset
|
1609 default: |
|
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|
1610 break; |
|
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|
1611 } |
|
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changeset
|
1612 return false; |
|
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|
1613 } |
|
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diff
changeset
|
1614 |
|
55
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19
diff
changeset
|
1615 /* Run bitwise and assignments throug the folder. If the first argument is an |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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19
diff
changeset
|
1616 ssa name that is itself a result of a typecast of an ADDR_EXPR to an |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
19
diff
changeset
|
1617 integer, feed the ADDR_EXPR to the folder rather than the ssa name. |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
19
diff
changeset
|
1618 */ |
|
77e2b8dfacca
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parents:
19
diff
changeset
|
1619 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
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diff
changeset
|
1620 static void |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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19
diff
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|
1621 simplify_bitwise_and (gimple_stmt_iterator *gsi, gimple stmt) |
|
77e2b8dfacca
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diff
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|
1622 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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diff
changeset
|
1623 tree res; |
|
77e2b8dfacca
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19
diff
changeset
|
1624 tree arg1 = gimple_assign_rhs1 (stmt); |
|
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19
diff
changeset
|
1625 tree arg2 = gimple_assign_rhs2 (stmt); |
|
77e2b8dfacca
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parents:
19
diff
changeset
|
1626 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
19
diff
changeset
|
1627 if (TREE_CODE (arg2) != INTEGER_CST) |
|
77e2b8dfacca
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parents:
19
diff
changeset
|
1628 return; |
|
77e2b8dfacca
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19
diff
changeset
|
1629 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
19
diff
changeset
|
1630 if (TREE_CODE (arg1) == SSA_NAME && !SSA_NAME_IS_DEFAULT_DEF (arg1)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1631 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1632 gimple def = SSA_NAME_DEF_STMT (arg1); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
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parents:
19
diff
changeset
|
1633 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1634 if (gimple_assign_cast_p (def) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1635 && INTEGRAL_TYPE_P (gimple_expr_type (def))) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1636 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1637 tree op = gimple_assign_rhs1 (def); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1638 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1639 if (TREE_CODE (op) == ADDR_EXPR) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1640 arg1 = op; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1641 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1642 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1643 |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1644 res = fold_binary_loc (gimple_location (stmt), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1645 BIT_AND_EXPR, TREE_TYPE (gimple_assign_lhs (stmt)), |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1646 arg1, arg2); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1647 if (res && is_gimple_min_invariant (res)) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1648 { |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1649 gimple_assign_set_rhs_from_tree (gsi, res); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1650 update_stmt (stmt); |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1651 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1652 return; |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1653 } |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1654 |
|
67
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diff
changeset
|
1655 |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
1656 /* Perform re-associations of the plus or minus statement STMT that are |
|
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diff
changeset
|
1657 always permitted. Returns true if the CFG was changed. */ |
|
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diff
changeset
|
1658 |
|
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diff
changeset
|
1659 static bool |
|
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diff
changeset
|
1660 associate_plusminus (gimple stmt) |
|
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diff
changeset
|
1661 { |
|
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diff
changeset
|
1662 tree rhs1 = gimple_assign_rhs1 (stmt); |
|
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changeset
|
1663 tree rhs2 = gimple_assign_rhs2 (stmt); |
|
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diff
changeset
|
1664 enum tree_code code = gimple_assign_rhs_code (stmt); |
|
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changeset
|
1665 gimple_stmt_iterator gsi; |
|
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diff
changeset
|
1666 bool changed; |
|
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changeset
|
1667 |
|
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changeset
|
1668 /* We can't reassociate at all for saturating types. */ |
|
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diff
changeset
|
1669 if (TYPE_SATURATING (TREE_TYPE (rhs1))) |
|
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changeset
|
1670 return false; |
|
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diff
changeset
|
1671 |
|
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diff
changeset
|
1672 /* First contract negates. */ |
|
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diff
changeset
|
1673 do |
|
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diff
changeset
|
1674 { |
|
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diff
changeset
|
1675 changed = false; |
|
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63
diff
changeset
|
1676 |
|
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63
diff
changeset
|
1677 /* A +- (-B) -> A -+ B. */ |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
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|
1678 if (TREE_CODE (rhs2) == SSA_NAME) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
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|
1679 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
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|
1680 gimple def_stmt = SSA_NAME_DEF_STMT (rhs2); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1681 if (is_gimple_assign (def_stmt) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
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|
1682 && gimple_assign_rhs_code (def_stmt) == NEGATE_EXPR) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1683 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
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|
1684 code = (code == MINUS_EXPR) ? PLUS_EXPR : MINUS_EXPR; |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1685 gimple_assign_set_rhs_code (stmt, code); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
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|
1686 rhs2 = gimple_assign_rhs1 (def_stmt); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1687 gimple_assign_set_rhs2 (stmt, rhs2); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1688 gimple_set_modified (stmt, true); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1689 changed = true; |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1690 } |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
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|
1691 } |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
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|
1692 |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1693 /* (-A) + B -> B - A. */ |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
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|
1694 if (TREE_CODE (rhs1) == SSA_NAME |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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|
1695 && code == PLUS_EXPR) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1696 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
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|
1697 gimple def_stmt = SSA_NAME_DEF_STMT (rhs1); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1698 if (is_gimple_assign (def_stmt) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
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|
1699 && gimple_assign_rhs_code (def_stmt) == NEGATE_EXPR) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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|
1700 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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|
1701 code = MINUS_EXPR; |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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|
1702 gimple_assign_set_rhs_code (stmt, code); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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|
1703 rhs1 = rhs2; |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
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|
1704 gimple_assign_set_rhs1 (stmt, rhs1); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
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|
1705 rhs2 = gimple_assign_rhs1 (def_stmt); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1706 gimple_assign_set_rhs2 (stmt, rhs2); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
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|
1707 gimple_set_modified (stmt, true); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1708 changed = true; |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
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changeset
|
1709 } |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
1710 } |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
1711 } |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1712 while (changed); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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|
1713 |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
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|
1714 /* We can't reassociate floating-point or fixed-point plus or minus |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1715 because of saturation to +-Inf. */ |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1716 if (FLOAT_TYPE_P (TREE_TYPE (rhs1)) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
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|
1717 || FIXED_POINT_TYPE_P (TREE_TYPE (rhs1))) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1718 goto out; |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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|
1719 |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1720 /* Second match patterns that allow contracting a plus-minus pair |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
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|
1721 irrespective of overflow issues. |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1722 |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1723 (A +- B) - A -> +- B |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
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|
1724 (A +- B) -+ B -> A |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
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|
1725 (CST +- A) +- CST -> CST +- A |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1726 (A + CST) +- CST -> A + CST |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1727 ~A + A -> -1 |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1728 ~A + 1 -> -A |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1729 A - (A +- B) -> -+ B |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1730 A +- (B +- A) -> +- B |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1731 CST +- (CST +- A) -> CST +- A |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
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|
1732 CST +- (A +- CST) -> CST +- A |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1733 A + ~A -> -1 |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1734 |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1735 via commutating the addition and contracting operations to zero |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1736 by reassociation. */ |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1737 |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1738 gsi = gsi_for_stmt (stmt); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1739 if (TREE_CODE (rhs1) == SSA_NAME) |
|
f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1740 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1741 gimple def_stmt = SSA_NAME_DEF_STMT (rhs1); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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63
diff
changeset
|
1742 if (is_gimple_assign (def_stmt)) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
1743 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1744 enum tree_code def_code = gimple_assign_rhs_code (def_stmt); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1745 if (def_code == PLUS_EXPR |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
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|
1746 || def_code == MINUS_EXPR) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1747 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1748 tree def_rhs1 = gimple_assign_rhs1 (def_stmt); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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changeset
|
1749 tree def_rhs2 = gimple_assign_rhs2 (def_stmt); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1750 if (operand_equal_p (def_rhs1, rhs2, 0) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
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|
1751 && code == MINUS_EXPR) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
|
1752 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1753 /* (A +- B) - A -> +- B. */ |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
1754 code = ((def_code == PLUS_EXPR) |
|
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|
1755 ? TREE_CODE (def_rhs2) : NEGATE_EXPR); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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changeset
|
1756 rhs1 = def_rhs2; |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
1757 rhs2 = NULL_TREE; |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
1758 gimple_assign_set_rhs_with_ops (&gsi, code, rhs1, NULL_TREE); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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diff
changeset
|
1759 gcc_assert (gsi_stmt (gsi) == stmt); |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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changeset
|
1760 gimple_set_modified (stmt, true); |
|
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changeset
|
1761 } |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1762 else if (operand_equal_p (def_rhs2, rhs2, 0) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
1763 && code != def_code) |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
1764 { |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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changeset
|
1765 /* (A +- B) -+ B -> A. */ |
|
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1766 code = TREE_CODE (def_rhs1); |
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1767 rhs1 = def_rhs1; |
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1768 rhs2 = NULL_TREE; |
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1769 gimple_assign_set_rhs_with_ops (&gsi, code, rhs1, NULL_TREE); |
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1770 gcc_assert (gsi_stmt (gsi) == stmt); |
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1771 gimple_set_modified (stmt, true); |
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1772 } |
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1773 else if (TREE_CODE (rhs2) == INTEGER_CST |
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1774 && TREE_CODE (def_rhs1) == INTEGER_CST) |
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1775 { |
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1776 /* (CST +- A) +- CST -> CST +- A. */ |
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1777 tree cst = fold_binary (code, TREE_TYPE (rhs1), |
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1778 def_rhs1, rhs2); |
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1779 if (cst && !TREE_OVERFLOW (cst)) |
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1780 { |
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1781 code = def_code; |
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1782 gimple_assign_set_rhs_code (stmt, code); |
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1783 rhs1 = cst; |
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1784 gimple_assign_set_rhs1 (stmt, rhs1); |
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1785 rhs2 = def_rhs2; |
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1786 gimple_assign_set_rhs2 (stmt, rhs2); |
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1787 gimple_set_modified (stmt, true); |
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1788 } |
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1789 } |
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1790 else if (TREE_CODE (rhs2) == INTEGER_CST |
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1791 && TREE_CODE (def_rhs2) == INTEGER_CST |
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1792 && def_code == PLUS_EXPR) |
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1793 { |
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1794 /* (A + CST) +- CST -> A + CST. */ |
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1795 tree cst = fold_binary (code, TREE_TYPE (rhs1), |
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1796 def_rhs2, rhs2); |
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1797 if (cst && !TREE_OVERFLOW (cst)) |
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1798 { |
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1799 code = PLUS_EXPR; |
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1800 gimple_assign_set_rhs_code (stmt, code); |
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1801 rhs1 = def_rhs1; |
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1802 gimple_assign_set_rhs1 (stmt, rhs1); |
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1803 rhs2 = cst; |
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1804 gimple_assign_set_rhs2 (stmt, rhs2); |
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1805 gimple_set_modified (stmt, true); |
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1806 } |
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1807 } |
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1808 } |
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1809 else if (def_code == BIT_NOT_EXPR |
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1810 && INTEGRAL_TYPE_P (TREE_TYPE (rhs1))) |
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1811 { |
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1812 tree def_rhs1 = gimple_assign_rhs1 (def_stmt); |
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1813 if (code == PLUS_EXPR |
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1814 && operand_equal_p (def_rhs1, rhs2, 0)) |
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1815 { |
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1816 /* ~A + A -> -1. */ |
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1817 code = INTEGER_CST; |
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1818 rhs1 = build_int_cst (TREE_TYPE (rhs2), -1); |
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1819 rhs2 = NULL_TREE; |
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1820 gimple_assign_set_rhs_with_ops (&gsi, code, rhs1, NULL_TREE); |
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1821 gcc_assert (gsi_stmt (gsi) == stmt); |
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1822 gimple_set_modified (stmt, true); |
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1823 } |
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1824 else if (code == PLUS_EXPR |
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1825 && integer_onep (rhs1)) |
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1826 { |
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1827 /* ~A + 1 -> -A. */ |
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1828 code = NEGATE_EXPR; |
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1829 rhs1 = def_rhs1; |
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1830 rhs2 = NULL_TREE; |
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1831 gimple_assign_set_rhs_with_ops (&gsi, code, rhs1, NULL_TREE); |
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1832 gcc_assert (gsi_stmt (gsi) == stmt); |
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1833 gimple_set_modified (stmt, true); |
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1834 } |
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1835 } |
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1836 } |
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1837 } |
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1838 |
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1839 if (rhs2 && TREE_CODE (rhs2) == SSA_NAME) |
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1840 { |
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1841 gimple def_stmt = SSA_NAME_DEF_STMT (rhs2); |
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1842 if (is_gimple_assign (def_stmt)) |
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1843 { |
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1844 enum tree_code def_code = gimple_assign_rhs_code (def_stmt); |
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1845 if (def_code == PLUS_EXPR |
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1846 || def_code == MINUS_EXPR) |
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1847 { |
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1848 tree def_rhs1 = gimple_assign_rhs1 (def_stmt); |
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1849 tree def_rhs2 = gimple_assign_rhs2 (def_stmt); |
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1850 if (operand_equal_p (def_rhs1, rhs1, 0) |
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1851 && code == MINUS_EXPR) |
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1852 { |
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1853 /* A - (A +- B) -> -+ B. */ |
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1854 code = ((def_code == PLUS_EXPR) |
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1855 ? NEGATE_EXPR : TREE_CODE (def_rhs2)); |
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1856 rhs1 = def_rhs2; |
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1857 rhs2 = NULL_TREE; |
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1858 gimple_assign_set_rhs_with_ops (&gsi, code, rhs1, NULL_TREE); |
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1859 gcc_assert (gsi_stmt (gsi) == stmt); |
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1860 gimple_set_modified (stmt, true); |
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1861 } |
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1862 else if (operand_equal_p (def_rhs2, rhs1, 0) |
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1863 && code != def_code) |
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1864 { |
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1865 /* A +- (B +- A) -> +- B. */ |
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1866 code = ((code == PLUS_EXPR) |
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1867 ? TREE_CODE (def_rhs1) : NEGATE_EXPR); |
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1868 rhs1 = def_rhs1; |
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1869 rhs2 = NULL_TREE; |
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1870 gimple_assign_set_rhs_with_ops (&gsi, code, rhs1, NULL_TREE); |
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1871 gcc_assert (gsi_stmt (gsi) == stmt); |
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1872 gimple_set_modified (stmt, true); |
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1873 } |
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1874 else if (TREE_CODE (rhs1) == INTEGER_CST |
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1875 && TREE_CODE (def_rhs1) == INTEGER_CST) |
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1876 { |
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1877 /* CST +- (CST +- A) -> CST +- A. */ |
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1878 tree cst = fold_binary (code, TREE_TYPE (rhs2), |
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1879 rhs1, def_rhs1); |
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1880 if (cst && !TREE_OVERFLOW (cst)) |
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1881 { |
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1882 code = (code == def_code ? PLUS_EXPR : MINUS_EXPR); |
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1883 gimple_assign_set_rhs_code (stmt, code); |
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1884 rhs1 = cst; |
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1885 gimple_assign_set_rhs1 (stmt, rhs1); |
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1886 rhs2 = def_rhs2; |
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1887 gimple_assign_set_rhs2 (stmt, rhs2); |
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1888 gimple_set_modified (stmt, true); |
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1889 } |
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1890 } |
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1891 else if (TREE_CODE (rhs1) == INTEGER_CST |
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1892 && TREE_CODE (def_rhs2) == INTEGER_CST) |
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1893 { |
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1894 /* CST +- (A +- CST) -> CST +- A. */ |
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1895 tree cst = fold_binary (def_code == code |
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1896 ? PLUS_EXPR : MINUS_EXPR, |
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1897 TREE_TYPE (rhs2), |
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1898 rhs1, def_rhs2); |
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1899 if (cst && !TREE_OVERFLOW (cst)) |
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1900 { |
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1901 rhs1 = cst; |
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1902 gimple_assign_set_rhs1 (stmt, rhs1); |
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1903 rhs2 = def_rhs1; |
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1904 gimple_assign_set_rhs2 (stmt, rhs2); |
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1905 gimple_set_modified (stmt, true); |
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1906 } |
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1907 } |
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1908 } |
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1909 else if (def_code == BIT_NOT_EXPR |
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1910 && INTEGRAL_TYPE_P (TREE_TYPE (rhs2))) |
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1911 { |
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1912 tree def_rhs1 = gimple_assign_rhs1 (def_stmt); |
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1913 if (code == PLUS_EXPR |
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1914 && operand_equal_p (def_rhs1, rhs1, 0)) |
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1915 { |
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1916 /* A + ~A -> -1. */ |
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1917 code = INTEGER_CST; |
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1918 rhs1 = build_int_cst (TREE_TYPE (rhs1), -1); |
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1919 rhs2 = NULL_TREE; |
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1920 gimple_assign_set_rhs_with_ops (&gsi, code, rhs1, NULL_TREE); |
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1921 gcc_assert (gsi_stmt (gsi) == stmt); |
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1922 gimple_set_modified (stmt, true); |
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1923 } |
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1924 } |
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1925 } |
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1926 } |
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1927 |
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1928 out: |
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1929 if (gimple_modified_p (stmt)) |
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1930 { |
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1931 fold_stmt_inplace (stmt); |
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1932 update_stmt (stmt); |
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1933 if (maybe_clean_or_replace_eh_stmt (stmt, stmt) |
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1934 && gimple_purge_dead_eh_edges (gimple_bb (stmt))) |
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1935 return true; |
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1936 } |
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1937 |
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1938 return false; |
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1939 } |
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1940 |
| 0 | 1941 /* Main entry point for the forward propagation optimizer. */ |
| 1942 | |
| 1943 static unsigned int | |
| 1944 tree_ssa_forward_propagate_single_use_vars (void) | |
| 1945 { | |
| 1946 basic_block bb; | |
| 1947 unsigned int todoflags = 0; | |
| 1948 | |
| 1949 cfg_changed = false; | |
| 1950 | |
| 1951 FOR_EACH_BB (bb) | |
| 1952 { | |
| 1953 gimple_stmt_iterator gsi; | |
| 1954 | |
| 1955 /* Note we update GSI within the loop as necessary. */ | |
| 1956 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); ) | |
| 1957 { | |
| 1958 gimple stmt = gsi_stmt (gsi); | |
| 1959 | |
| 1960 /* If this statement sets an SSA_NAME to an address, | |
| 1961 try to propagate the address into the uses of the SSA_NAME. */ | |
| 1962 if (is_gimple_assign (stmt)) | |
| 1963 { | |
| 1964 tree lhs = gimple_assign_lhs (stmt); | |
| 1965 tree rhs = gimple_assign_rhs1 (stmt); | |
| 1966 | |
| 1967 if (TREE_CODE (lhs) != SSA_NAME) | |
| 1968 { | |
| 1969 gsi_next (&gsi); | |
| 1970 continue; | |
| 1971 } | |
| 1972 | |
| 1973 if (gimple_assign_rhs_code (stmt) == ADDR_EXPR | |
| 1974 /* Handle pointer conversions on invariant addresses | |
| 1975 as well, as this is valid gimple. */ | |
| 1976 || (CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (stmt)) | |
| 1977 && TREE_CODE (rhs) == ADDR_EXPR | |
| 1978 && POINTER_TYPE_P (TREE_TYPE (lhs)))) | |
| 1979 { | |
|
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1980 tree base = get_base_address (TREE_OPERAND (rhs, 0)); |
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1981 if ((!base |
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1982 || !DECL_P (base) |
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1983 || decl_address_invariant_p (base)) |
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1984 && !stmt_references_abnormal_ssa_name (stmt) |
| 0 | 1985 && forward_propagate_addr_expr (lhs, rhs)) |
| 1986 { | |
| 1987 release_defs (stmt); | |
| 1988 todoflags |= TODO_remove_unused_locals; | |
| 1989 gsi_remove (&gsi, true); | |
| 1990 } | |
| 1991 else | |
| 1992 gsi_next (&gsi); | |
| 1993 } | |
|
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1994 else if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR |
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1995 && can_propagate_from (stmt)) |
|
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1996 { |
|
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1997 if (TREE_CODE (gimple_assign_rhs2 (stmt)) == INTEGER_CST |
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1998 /* ??? Better adjust the interface to that function |
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1999 instead of building new trees here. */ |
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2000 && forward_propagate_addr_expr |
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2001 (lhs, |
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2002 build1 (ADDR_EXPR, |
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2003 TREE_TYPE (rhs), |
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2004 fold_build2 (MEM_REF, |
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2005 TREE_TYPE (TREE_TYPE (rhs)), |
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2006 rhs, |
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2007 fold_convert |
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2008 (ptr_type_node, |
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2009 gimple_assign_rhs2 (stmt)))))) |
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2010 { |
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2011 release_defs (stmt); |
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2012 todoflags |= TODO_remove_unused_locals; |
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2013 gsi_remove (&gsi, true); |
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2014 } |
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2015 else if (is_gimple_min_invariant (rhs)) |
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2016 { |
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2017 /* Make sure to fold &a[0] + off_1 here. */ |
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2018 fold_stmt_inplace (stmt); |
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2019 update_stmt (stmt); |
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2020 if (gimple_assign_rhs_code (stmt) == POINTER_PLUS_EXPR) |
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2021 gsi_next (&gsi); |
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2022 } |
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2023 else |
|
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2024 gsi_next (&gsi); |
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2025 } |
| 0 | 2026 else if ((gimple_assign_rhs_code (stmt) == BIT_NOT_EXPR |
| 2027 || gimple_assign_rhs_code (stmt) == NEGATE_EXPR) | |
| 2028 && TREE_CODE (rhs) == SSA_NAME) | |
| 2029 { | |
| 2030 simplify_not_neg_expr (&gsi); | |
| 2031 gsi_next (&gsi); | |
| 2032 } | |
| 2033 else if (gimple_assign_rhs_code (stmt) == COND_EXPR) | |
| 2034 { | |
| 2035 /* In this case the entire COND_EXPR is in rhs1. */ | |
| 2036 int did_something; | |
| 2037 fold_defer_overflow_warnings (); | |
| 2038 did_something = forward_propagate_into_cond (&gsi); | |
| 2039 stmt = gsi_stmt (gsi); | |
| 2040 if (did_something == 2) | |
| 2041 cfg_changed = true; | |
| 2042 fold_undefer_overflow_warnings (!TREE_NO_WARNING (rhs) | |
| 2043 && did_something, stmt, WARN_STRICT_OVERFLOW_CONDITIONAL); | |
| 2044 gsi_next (&gsi); | |
| 2045 } | |
| 2046 else if (TREE_CODE_CLASS (gimple_assign_rhs_code (stmt)) | |
| 2047 == tcc_comparison) | |
| 2048 { | |
| 2049 if (forward_propagate_comparison (stmt)) | |
|
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2050 cfg_changed = true; |
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2051 gsi_next (&gsi); |
| 0 | 2052 } |
|
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2053 else if (gimple_assign_rhs_code (stmt) == BIT_AND_EXPR) |
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2054 { |
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2055 simplify_bitwise_and (&gsi, stmt); |
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2056 gsi_next (&gsi); |
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2057 } |
|
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2058 else if (gimple_assign_rhs_code (stmt) == PLUS_EXPR |
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2059 || gimple_assign_rhs_code (stmt) == MINUS_EXPR) |
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2060 { |
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2061 cfg_changed |= associate_plusminus (stmt); |
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2062 gsi_next (&gsi); |
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2063 } |
| 0 | 2064 else |
| 2065 gsi_next (&gsi); | |
| 2066 } | |
| 2067 else if (gimple_code (stmt) == GIMPLE_SWITCH) | |
| 2068 { | |
| 2069 simplify_gimple_switch (stmt); | |
| 2070 gsi_next (&gsi); | |
| 2071 } | |
| 2072 else if (gimple_code (stmt) == GIMPLE_COND) | |
| 2073 { | |
| 2074 int did_something; | |
| 2075 fold_defer_overflow_warnings (); | |
| 2076 did_something = forward_propagate_into_gimple_cond (stmt); | |
| 2077 if (did_something == 2) | |
| 2078 cfg_changed = true; | |
| 2079 fold_undefer_overflow_warnings (did_something, stmt, | |
| 2080 WARN_STRICT_OVERFLOW_CONDITIONAL); | |
| 2081 gsi_next (&gsi); | |
| 2082 } | |
|
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2083 else if (is_gimple_call (stmt)) |
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2084 { |
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2085 tree callee = gimple_call_fndecl (stmt); |
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2086 if (callee == NULL_TREE |
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2087 || DECL_BUILT_IN_CLASS (callee) != BUILT_IN_NORMAL |
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2088 || !simplify_builtin_call (&gsi, callee)) |
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2089 gsi_next (&gsi); |
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2090 } |
| 0 | 2091 else |
| 2092 gsi_next (&gsi); | |
| 2093 } | |
| 2094 } | |
| 2095 | |
| 2096 if (cfg_changed) | |
| 2097 todoflags |= TODO_cleanup_cfg; | |
| 2098 return todoflags; | |
| 2099 } | |
| 2100 | |
| 2101 | |
| 2102 static bool | |
| 2103 gate_forwprop (void) | |
| 2104 { | |
|
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2105 return flag_tree_forwprop; |
| 0 | 2106 } |
| 2107 | |
|
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2108 struct gimple_opt_pass pass_forwprop = |
| 0 | 2109 { |
| 2110 { | |
| 2111 GIMPLE_PASS, | |
| 2112 "forwprop", /* name */ | |
| 2113 gate_forwprop, /* gate */ | |
| 2114 tree_ssa_forward_propagate_single_use_vars, /* execute */ | |
| 2115 NULL, /* sub */ | |
| 2116 NULL, /* next */ | |
| 2117 0, /* static_pass_number */ | |
| 2118 TV_TREE_FORWPROP, /* tv_id */ | |
| 2119 PROP_cfg | PROP_ssa, /* properties_required */ | |
| 2120 0, /* properties_provided */ | |
| 2121 0, /* properties_destroyed */ | |
| 2122 0, /* todo_flags_start */ | |
| 2123 TODO_dump_func | |
| 2124 | TODO_ggc_collect | |
| 2125 | TODO_update_ssa | |
| 2126 | TODO_verify_ssa /* todo_flags_finish */ | |
| 2127 } | |
| 2128 }; | |
| 2129 |