Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-phiprop.c @ 60:bd49c42ec43e
remove unnecessary files
| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 15 Feb 2010 17:39:45 +0900 |
| parents | 77e2b8dfacca |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* Backward propagation of indirect loads through PHIs. |
| 2 Copyright (C) 2007, 2008 Free Software Foundation, Inc. | |
| 3 Contributed by Richard Guenther <rguenther@suse.de> | |
| 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 "ggc.h" | |
| 26 #include "tree.h" | |
| 27 #include "rtl.h" | |
| 28 #include "tm_p.h" | |
| 29 #include "basic-block.h" | |
| 30 #include "timevar.h" | |
| 31 #include "diagnostic.h" | |
| 32 #include "tree-flow.h" | |
| 33 #include "tree-pass.h" | |
| 34 #include "tree-dump.h" | |
| 35 #include "langhooks.h" | |
| 36 #include "flags.h" | |
| 37 | |
| 38 /* This pass propagates indirect loads through the PHI node for its | |
| 39 address to make the load source possibly non-addressable and to | |
| 40 allow for PHI optimization to trigger. | |
| 41 | |
| 42 For example the pass changes | |
| 43 | |
| 44 # addr_1 = PHI <&a, &b> | |
| 45 tmp_1 = *addr_1; | |
| 46 | |
| 47 to | |
| 48 | |
| 49 # tmp_1 = PHI <a, b> | |
| 50 | |
| 51 but also handles more complex scenarios like | |
| 52 | |
| 53 D.2077_2 = &this_1(D)->a1; | |
| 54 ... | |
| 55 | |
| 56 # b_12 = PHI <&c(2), D.2077_2(3)> | |
| 57 D.2114_13 = *b_12; | |
| 58 ... | |
| 59 | |
| 60 # b_15 = PHI <b_12(4), &b(5)> | |
| 61 D.2080_5 = &this_1(D)->a0; | |
| 62 ... | |
| 63 | |
| 64 # b_18 = PHI <D.2080_5(6), &c(7)> | |
| 65 ... | |
| 66 | |
| 67 # b_21 = PHI <b_15(8), b_18(9)> | |
| 68 D.2076_8 = *b_21; | |
| 69 | |
| 70 where the addresses loaded are defined by PHIs itself. | |
| 71 The above happens for | |
| 72 | |
| 73 std::max(std::min(a0, c), std::min(std::max(a1, c), b)) | |
| 74 | |
| 75 where this pass transforms it to a form later PHI optimization | |
| 76 recognizes and transforms it to the simple | |
| 77 | |
| 78 D.2109_10 = this_1(D)->a1; | |
| 79 D.2110_11 = c; | |
| 80 D.2114_31 = MAX_EXPR <D.2109_10, D.2110_11>; | |
| 81 D.2115_14 = b; | |
| 82 D.2125_17 = MIN_EXPR <D.2115_14, D.2114_31>; | |
| 83 D.2119_16 = this_1(D)->a0; | |
| 84 D.2124_32 = MIN_EXPR <D.2110_11, D.2119_16>; | |
| 85 D.2076_33 = MAX_EXPR <D.2125_17, D.2124_32>; | |
| 86 | |
| 87 The pass does a dominator walk processing loads using a basic-block | |
| 88 local analysis and stores the result for use by transformations on | |
| 89 dominated basic-blocks. */ | |
| 90 | |
| 91 | |
| 92 /* Structure to keep track of the value of a dereferenced PHI result | |
|
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93 and the virtual operand used for that dereference. */ |
| 0 | 94 |
| 95 struct phiprop_d | |
| 96 { | |
| 97 tree value; | |
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98 tree vuse; |
| 0 | 99 }; |
| 100 | |
| 101 /* Verify if the value recorded for NAME in PHIVN is still valid at | |
| 102 the start of basic block BB. */ | |
| 103 | |
| 104 static bool | |
| 105 phivn_valid_p (struct phiprop_d *phivn, tree name, basic_block bb) | |
| 106 { | |
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107 tree vuse = phivn[SSA_NAME_VERSION (name)].vuse; |
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108 gimple use_stmt; |
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109 imm_use_iterator ui2; |
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110 bool ok = true; |
| 0 | 111 |
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112 /* The def stmts of the virtual uses need to be dominated by bb. */ |
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113 gcc_assert (vuse != NULL_TREE); |
| 0 | 114 |
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115 FOR_EACH_IMM_USE_STMT (use_stmt, ui2, vuse) |
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116 { |
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117 /* If BB does not dominate a VDEF, the value is invalid. */ |
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118 if ((gimple_vdef (use_stmt) != NULL_TREE |
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119 || gimple_code (use_stmt) == GIMPLE_PHI) |
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120 && !dominated_by_p (CDI_DOMINATORS, gimple_bb (use_stmt), bb)) |
| 0 | 121 { |
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122 ok = false; |
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123 BREAK_FROM_IMM_USE_STMT (ui2); |
| 0 | 124 } |
| 125 } | |
| 126 | |
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127 return ok; |
| 0 | 128 } |
| 129 | |
| 130 /* Insert a new phi node for the dereference of PHI at basic_block | |
| 131 BB with the virtual operands from USE_STMT. */ | |
| 132 | |
| 133 static tree | |
| 134 phiprop_insert_phi (basic_block bb, gimple phi, gimple use_stmt, | |
| 135 struct phiprop_d *phivn, size_t n) | |
| 136 { | |
| 137 tree res; | |
| 138 gimple new_phi; | |
| 139 edge_iterator ei; | |
| 140 edge e; | |
| 141 | |
| 142 gcc_assert (is_gimple_assign (use_stmt) | |
| 143 && gimple_assign_rhs_code (use_stmt) == INDIRECT_REF); | |
| 144 | |
| 145 /* Build a new PHI node to replace the definition of | |
| 146 the indirect reference lhs. */ | |
| 147 res = gimple_assign_lhs (use_stmt); | |
| 148 SSA_NAME_DEF_STMT (res) = new_phi = create_phi_node (res, bb); | |
| 149 | |
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150 if (dump_file && (dump_flags & TDF_DETAILS)) |
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151 { |
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152 fprintf (dump_file, "Inserting PHI for result of load "); |
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153 print_gimple_stmt (dump_file, use_stmt, 0, 0); |
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154 } |
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155 |
| 0 | 156 /* Add PHI arguments for each edge inserting loads of the |
| 157 addressable operands. */ | |
| 158 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 159 { | |
| 160 tree old_arg, new_var; | |
| 161 gimple tmp; | |
|
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162 source_location locus; |
| 0 | 163 |
| 164 old_arg = PHI_ARG_DEF_FROM_EDGE (phi, e); | |
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165 locus = gimple_phi_arg_location_from_edge (phi, e); |
| 0 | 166 while (TREE_CODE (old_arg) == SSA_NAME |
| 167 && (SSA_NAME_VERSION (old_arg) >= n | |
| 168 || phivn[SSA_NAME_VERSION (old_arg)].value == NULL_TREE)) | |
| 169 { | |
| 170 gimple def_stmt = SSA_NAME_DEF_STMT (old_arg); | |
| 171 old_arg = gimple_assign_rhs1 (def_stmt); | |
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172 locus = gimple_location (def_stmt); |
| 0 | 173 } |
| 174 | |
| 175 if (TREE_CODE (old_arg) == SSA_NAME) | |
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176 { |
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177 if (dump_file && (dump_flags & TDF_DETAILS)) |
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178 { |
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179 fprintf (dump_file, " for edge defining "); |
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180 print_generic_expr (dump_file, PHI_ARG_DEF_FROM_EDGE (phi, e), 0); |
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181 fprintf (dump_file, " reusing PHI result "); |
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182 print_generic_expr (dump_file, |
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183 phivn[SSA_NAME_VERSION (old_arg)].value, 0); |
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184 fprintf (dump_file, "\n"); |
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185 } |
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186 /* Reuse a formerly created dereference. */ |
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187 new_var = phivn[SSA_NAME_VERSION (old_arg)].value; |
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188 } |
| 0 | 189 else |
| 190 { | |
| 191 gcc_assert (TREE_CODE (old_arg) == ADDR_EXPR); | |
| 192 old_arg = TREE_OPERAND (old_arg, 0); | |
| 193 new_var = create_tmp_var (TREE_TYPE (old_arg), NULL); | |
| 194 tmp = gimple_build_assign (new_var, unshare_expr (old_arg)); | |
| 195 if (TREE_CODE (TREE_TYPE (old_arg)) == COMPLEX_TYPE | |
| 196 || TREE_CODE (TREE_TYPE (old_arg)) == VECTOR_TYPE) | |
| 197 DECL_GIMPLE_REG_P (new_var) = 1; | |
| 198 gcc_assert (is_gimple_reg (new_var)); | |
| 199 add_referenced_var (new_var); | |
| 200 new_var = make_ssa_name (new_var, tmp); | |
| 201 gimple_assign_set_lhs (tmp, new_var); | |
|
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202 gimple_set_location (tmp, locus); |
| 0 | 203 |
| 204 gsi_insert_on_edge (e, tmp); | |
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205 update_stmt (tmp); |
| 0 | 206 |
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207 if (dump_file && (dump_flags & TDF_DETAILS)) |
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208 { |
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209 fprintf (dump_file, " for edge defining "); |
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210 print_generic_expr (dump_file, PHI_ARG_DEF_FROM_EDGE (phi, e), 0); |
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211 fprintf (dump_file, " inserting load "); |
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212 print_gimple_stmt (dump_file, tmp, 0, 0); |
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213 } |
| 0 | 214 } |
| 215 | |
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216 add_phi_arg (new_phi, new_var, e, locus); |
| 0 | 217 } |
| 218 | |
| 219 update_stmt (new_phi); | |
| 220 | |
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221 if (dump_file && (dump_flags & TDF_DETAILS)) |
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222 print_gimple_stmt (dump_file, new_phi, 0, 0); |
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223 |
| 0 | 224 return res; |
| 225 } | |
| 226 | |
| 227 /* Propagate between the phi node arguments of PHI in BB and phi result | |
| 228 users. For now this matches | |
| 229 # p_2 = PHI <&x, &y> | |
| 230 <Lx>:; | |
| 231 p_3 = p_2; | |
| 232 z_2 = *p_3; | |
| 233 and converts it to | |
| 234 # z_2 = PHI <x, y> | |
| 235 <Lx>:; | |
| 236 Returns true if a transformation was done and edge insertions | |
| 237 need to be committed. Global data PHIVN and N is used to track | |
| 238 past transformation results. We need to be especially careful here | |
| 239 with aliasing issues as we are moving memory reads. */ | |
| 240 | |
| 241 static bool | |
| 242 propagate_with_phi (basic_block bb, gimple phi, struct phiprop_d *phivn, | |
| 243 size_t n) | |
| 244 { | |
| 245 tree ptr = PHI_RESULT (phi); | |
| 246 gimple use_stmt; | |
| 247 tree res = NULL_TREE; | |
| 248 gimple_stmt_iterator gsi; | |
| 249 imm_use_iterator ui; | |
| 250 use_operand_p arg_p, use; | |
| 251 ssa_op_iter i; | |
| 252 bool phi_inserted; | |
| 253 | |
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254 if (!POINTER_TYPE_P (TREE_TYPE (ptr)) |
| 0 | 255 || !is_gimple_reg_type (TREE_TYPE (TREE_TYPE (ptr)))) |
| 256 return false; | |
| 257 | |
| 258 /* Check if we can "cheaply" dereference all phi arguments. */ | |
| 259 FOR_EACH_PHI_ARG (arg_p, phi, i, SSA_OP_USE) | |
| 260 { | |
| 261 tree arg = USE_FROM_PTR (arg_p); | |
| 262 /* Walk the ssa chain until we reach a ssa name we already | |
| 263 created a value for or we reach a definition of the form | |
| 264 ssa_name_n = &var; */ | |
| 265 while (TREE_CODE (arg) == SSA_NAME | |
| 266 && !SSA_NAME_IS_DEFAULT_DEF (arg) | |
| 267 && (SSA_NAME_VERSION (arg) >= n | |
| 268 || phivn[SSA_NAME_VERSION (arg)].value == NULL_TREE)) | |
| 269 { | |
| 270 gimple def_stmt = SSA_NAME_DEF_STMT (arg); | |
| 271 if (!gimple_assign_single_p (def_stmt)) | |
| 272 return false; | |
| 273 arg = gimple_assign_rhs1 (def_stmt); | |
| 274 } | |
| 275 if ((TREE_CODE (arg) != ADDR_EXPR | |
| 276 /* Avoid to have to decay *&a to a[0] later. */ | |
| 277 || !is_gimple_reg_type (TREE_TYPE (TREE_OPERAND (arg, 0)))) | |
| 278 && !(TREE_CODE (arg) == SSA_NAME | |
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279 && SSA_NAME_VERSION (arg) < n |
| 0 | 280 && phivn[SSA_NAME_VERSION (arg)].value != NULL_TREE |
| 281 && phivn_valid_p (phivn, arg, bb))) | |
| 282 return false; | |
| 283 } | |
| 284 | |
| 285 /* Find a dereferencing use. First follow (single use) ssa | |
| 286 copy chains for ptr. */ | |
| 287 while (single_imm_use (ptr, &use, &use_stmt) | |
| 288 && gimple_assign_ssa_name_copy_p (use_stmt)) | |
| 289 ptr = gimple_assign_lhs (use_stmt); | |
| 290 | |
| 291 /* Replace the first dereference of *ptr if there is one and if we | |
| 292 can move the loads to the place of the ptr phi node. */ | |
| 293 phi_inserted = false; | |
| 294 FOR_EACH_IMM_USE_STMT (use_stmt, ui, ptr) | |
| 295 { | |
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296 gimple def_stmt; |
| 0 | 297 tree vuse; |
| 298 | |
| 299 /* Check whether this is a load of *ptr. */ | |
| 300 if (!(is_gimple_assign (use_stmt) | |
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301 && TREE_CODE (gimple_assign_lhs (use_stmt)) == SSA_NAME |
| 0 | 302 && gimple_assign_rhs_code (use_stmt) == INDIRECT_REF |
| 303 && TREE_OPERAND (gimple_assign_rhs1 (use_stmt), 0) == ptr | |
| 304 /* We cannot replace a load that may throw or is volatile. */ | |
| 305 && !stmt_can_throw_internal (use_stmt))) | |
| 306 continue; | |
| 307 | |
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308 /* Check if we can move the loads. The def stmt of the virtual use |
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309 needs to be in a different basic block dominating bb. */ |
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310 vuse = gimple_vuse (use_stmt); |
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311 def_stmt = SSA_NAME_DEF_STMT (vuse); |
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312 if (!SSA_NAME_IS_DEFAULT_DEF (vuse) |
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313 && (gimple_bb (def_stmt) == bb |
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314 || !dominated_by_p (CDI_DOMINATORS, |
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315 bb, gimple_bb (def_stmt)))) |
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316 goto next; |
| 0 | 317 |
| 318 /* Found a proper dereference. Insert a phi node if this | |
| 319 is the first load transformation. */ | |
| 320 if (!phi_inserted) | |
| 321 { | |
| 322 res = phiprop_insert_phi (bb, phi, use_stmt, phivn, n); | |
| 323 | |
| 324 /* Remember the value we created for *ptr. */ | |
| 325 phivn[SSA_NAME_VERSION (ptr)].value = res; | |
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326 phivn[SSA_NAME_VERSION (ptr)].vuse = vuse; |
| 0 | 327 |
| 328 /* Remove old stmt. The phi is taken care of by DCE, if we | |
| 329 want to delete it here we also have to delete all intermediate | |
| 330 copies. */ | |
| 331 gsi = gsi_for_stmt (use_stmt); | |
| 332 gsi_remove (&gsi, false); | |
| 333 | |
| 334 phi_inserted = true; | |
| 335 } | |
| 336 else | |
| 337 { | |
| 338 /* Further replacements are easy, just make a copy out of the | |
| 339 load. */ | |
| 340 gimple_assign_set_rhs1 (use_stmt, res); | |
| 341 update_stmt (use_stmt); | |
| 342 } | |
| 343 | |
| 344 next:; | |
| 345 /* Continue searching for a proper dereference. */ | |
| 346 } | |
| 347 | |
| 348 return phi_inserted; | |
| 349 } | |
| 350 | |
| 351 /* Main entry for phiprop pass. */ | |
| 352 | |
| 353 static unsigned int | |
| 354 tree_ssa_phiprop (void) | |
| 355 { | |
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356 VEC(basic_block, heap) *bbs; |
| 0 | 357 struct phiprop_d *phivn; |
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358 bool did_something = false; |
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359 basic_block bb; |
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360 gimple_stmt_iterator gsi; |
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361 unsigned i; |
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362 size_t n; |
| 0 | 363 |
| 364 calculate_dominance_info (CDI_DOMINATORS); | |
| 365 | |
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366 n = num_ssa_names; |
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367 phivn = XCNEWVEC (struct phiprop_d, n); |
| 0 | 368 |
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369 /* Walk the dominator tree in preorder. */ |
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370 bbs = get_all_dominated_blocks (CDI_DOMINATORS, |
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371 single_succ (ENTRY_BLOCK_PTR)); |
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372 for (i = 0; VEC_iterate (basic_block, bbs, i, bb); ++i) |
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373 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
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374 did_something |= propagate_with_phi (bb, gsi_stmt (gsi), phivn, n); |
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375 |
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376 if (did_something) |
| 0 | 377 gsi_commit_edge_inserts (); |
| 378 | |
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379 VEC_free (basic_block, heap, bbs); |
| 0 | 380 free (phivn); |
| 381 | |
| 382 return 0; | |
| 383 } | |
| 384 | |
| 385 static bool | |
| 386 gate_phiprop (void) | |
| 387 { | |
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388 return flag_tree_phiprop; |
| 0 | 389 } |
| 390 | |
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391 struct gimple_opt_pass pass_phiprop = |
| 0 | 392 { |
| 393 { | |
| 394 GIMPLE_PASS, | |
| 395 "phiprop", /* name */ | |
| 396 gate_phiprop, /* gate */ | |
| 397 tree_ssa_phiprop, /* execute */ | |
| 398 NULL, /* sub */ | |
| 399 NULL, /* next */ | |
| 400 0, /* static_pass_number */ | |
| 401 TV_TREE_PHIPROP, /* tv_id */ | |
| 402 PROP_cfg | PROP_ssa, /* properties_required */ | |
| 403 0, /* properties_provided */ | |
| 404 0, /* properties_destroyed */ | |
| 405 0, /* todo_flags_start */ | |
| 406 TODO_dump_func | |
| 407 | TODO_ggc_collect | |
| 408 | TODO_update_ssa | |
| 409 | TODO_verify_ssa /* todo_flags_finish */ | |
| 410 } | |
| 411 }; |