Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-phiprop.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Backward propagation of indirect loads through PHIs. |
|
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2 Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
| 0 | 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 "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" |
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30 #include "gimple-pretty-print.h" |
| 0 | 31 #include "tree-flow.h" |
| 32 #include "tree-pass.h" | |
| 33 #include "tree-dump.h" | |
| 34 #include "langhooks.h" | |
| 35 #include "flags.h" | |
| 36 | |
| 37 /* This pass propagates indirect loads through the PHI node for its | |
| 38 address to make the load source possibly non-addressable and to | |
| 39 allow for PHI optimization to trigger. | |
| 40 | |
| 41 For example the pass changes | |
| 42 | |
| 43 # addr_1 = PHI <&a, &b> | |
| 44 tmp_1 = *addr_1; | |
| 45 | |
| 46 to | |
| 47 | |
| 48 # tmp_1 = PHI <a, b> | |
| 49 | |
| 50 but also handles more complex scenarios like | |
| 51 | |
| 52 D.2077_2 = &this_1(D)->a1; | |
| 53 ... | |
| 54 | |
| 55 # b_12 = PHI <&c(2), D.2077_2(3)> | |
| 56 D.2114_13 = *b_12; | |
| 57 ... | |
| 58 | |
| 59 # b_15 = PHI <b_12(4), &b(5)> | |
| 60 D.2080_5 = &this_1(D)->a0; | |
| 61 ... | |
| 62 | |
| 63 # b_18 = PHI <D.2080_5(6), &c(7)> | |
| 64 ... | |
| 65 | |
| 66 # b_21 = PHI <b_15(8), b_18(9)> | |
| 67 D.2076_8 = *b_21; | |
| 68 | |
| 69 where the addresses loaded are defined by PHIs itself. | |
| 70 The above happens for | |
| 71 | |
| 72 std::max(std::min(a0, c), std::min(std::max(a1, c), b)) | |
| 73 | |
| 74 where this pass transforms it to a form later PHI optimization | |
| 75 recognizes and transforms it to the simple | |
| 76 | |
| 77 D.2109_10 = this_1(D)->a1; | |
| 78 D.2110_11 = c; | |
| 79 D.2114_31 = MAX_EXPR <D.2109_10, D.2110_11>; | |
| 80 D.2115_14 = b; | |
| 81 D.2125_17 = MIN_EXPR <D.2115_14, D.2114_31>; | |
| 82 D.2119_16 = this_1(D)->a0; | |
| 83 D.2124_32 = MIN_EXPR <D.2110_11, D.2119_16>; | |
| 84 D.2076_33 = MAX_EXPR <D.2125_17, D.2124_32>; | |
| 85 | |
| 86 The pass does a dominator walk processing loads using a basic-block | |
| 87 local analysis and stores the result for use by transformations on | |
| 88 dominated basic-blocks. */ | |
| 89 | |
| 90 | |
| 91 /* Structure to keep track of the value of a dereferenced PHI result | |
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92 and the virtual operand used for that dereference. */ |
| 0 | 93 |
| 94 struct phiprop_d | |
| 95 { | |
| 96 tree value; | |
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97 tree vuse; |
| 0 | 98 }; |
| 99 | |
| 100 /* Verify if the value recorded for NAME in PHIVN is still valid at | |
| 101 the start of basic block BB. */ | |
| 102 | |
| 103 static bool | |
| 104 phivn_valid_p (struct phiprop_d *phivn, tree name, basic_block bb) | |
| 105 { | |
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106 tree vuse = phivn[SSA_NAME_VERSION (name)].vuse; |
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107 gimple use_stmt; |
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108 imm_use_iterator ui2; |
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109 bool ok = true; |
| 0 | 110 |
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111 /* The def stmts of the virtual uses need to be dominated by bb. */ |
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112 gcc_assert (vuse != NULL_TREE); |
| 0 | 113 |
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114 FOR_EACH_IMM_USE_STMT (use_stmt, ui2, vuse) |
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115 { |
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116 /* If BB does not dominate a VDEF, the value is invalid. */ |
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117 if ((gimple_vdef (use_stmt) != NULL_TREE |
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118 || gimple_code (use_stmt) == GIMPLE_PHI) |
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119 && !dominated_by_p (CDI_DOMINATORS, gimple_bb (use_stmt), bb)) |
| 0 | 120 { |
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121 ok = false; |
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122 BREAK_FROM_IMM_USE_STMT (ui2); |
| 0 | 123 } |
| 124 } | |
| 125 | |
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126 return ok; |
| 0 | 127 } |
| 128 | |
| 129 /* Insert a new phi node for the dereference of PHI at basic_block | |
| 130 BB with the virtual operands from USE_STMT. */ | |
| 131 | |
| 132 static tree | |
| 133 phiprop_insert_phi (basic_block bb, gimple phi, gimple use_stmt, | |
| 134 struct phiprop_d *phivn, size_t n) | |
| 135 { | |
| 136 tree res; | |
| 137 gimple new_phi; | |
| 138 edge_iterator ei; | |
| 139 edge e; | |
| 140 | |
| 141 gcc_assert (is_gimple_assign (use_stmt) | |
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142 && gimple_assign_rhs_code (use_stmt) == MEM_REF); |
| 0 | 143 |
| 144 /* Build a new PHI node to replace the definition of | |
| 145 the indirect reference lhs. */ | |
| 146 res = gimple_assign_lhs (use_stmt); | |
| 147 SSA_NAME_DEF_STMT (res) = new_phi = create_phi_node (res, bb); | |
| 148 | |
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149 if (dump_file && (dump_flags & TDF_DETAILS)) |
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150 { |
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151 fprintf (dump_file, "Inserting PHI for result of load "); |
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152 print_gimple_stmt (dump_file, use_stmt, 0, 0); |
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153 } |
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154 |
| 0 | 155 /* Add PHI arguments for each edge inserting loads of the |
| 156 addressable operands. */ | |
| 157 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 158 { | |
| 159 tree old_arg, new_var; | |
| 160 gimple tmp; | |
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161 source_location locus; |
| 0 | 162 |
| 163 old_arg = PHI_ARG_DEF_FROM_EDGE (phi, e); | |
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164 locus = gimple_phi_arg_location_from_edge (phi, e); |
| 0 | 165 while (TREE_CODE (old_arg) == SSA_NAME |
| 166 && (SSA_NAME_VERSION (old_arg) >= n | |
| 167 || phivn[SSA_NAME_VERSION (old_arg)].value == NULL_TREE)) | |
| 168 { | |
| 169 gimple def_stmt = SSA_NAME_DEF_STMT (old_arg); | |
| 170 old_arg = gimple_assign_rhs1 (def_stmt); | |
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171 locus = gimple_location (def_stmt); |
| 0 | 172 } |
| 173 | |
| 174 if (TREE_CODE (old_arg) == SSA_NAME) | |
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175 { |
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176 if (dump_file && (dump_flags & TDF_DETAILS)) |
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177 { |
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178 fprintf (dump_file, " for edge defining "); |
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179 print_generic_expr (dump_file, PHI_ARG_DEF_FROM_EDGE (phi, e), 0); |
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180 fprintf (dump_file, " reusing PHI result "); |
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181 print_generic_expr (dump_file, |
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182 phivn[SSA_NAME_VERSION (old_arg)].value, 0); |
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183 fprintf (dump_file, "\n"); |
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184 } |
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185 /* Reuse a formerly created dereference. */ |
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186 new_var = phivn[SSA_NAME_VERSION (old_arg)].value; |
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187 } |
| 0 | 188 else |
| 189 { | |
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190 tree rhs = gimple_assign_rhs1 (use_stmt); |
| 0 | 191 gcc_assert (TREE_CODE (old_arg) == ADDR_EXPR); |
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192 new_var = create_tmp_reg (TREE_TYPE (rhs), NULL); |
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193 if (!is_gimple_min_invariant (old_arg)) |
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194 old_arg = PHI_ARG_DEF_FROM_EDGE (phi, e); |
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195 else |
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196 old_arg = unshare_expr (old_arg); |
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197 tmp = gimple_build_assign (new_var, |
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198 fold_build2 (MEM_REF, TREE_TYPE (rhs), |
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199 old_arg, |
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200 TREE_OPERAND (rhs, 1))); |
| 0 | 201 gcc_assert (is_gimple_reg (new_var)); |
| 202 add_referenced_var (new_var); | |
| 203 new_var = make_ssa_name (new_var, tmp); | |
| 204 gimple_assign_set_lhs (tmp, new_var); | |
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205 gimple_set_location (tmp, locus); |
| 0 | 206 |
| 207 gsi_insert_on_edge (e, tmp); | |
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208 update_stmt (tmp); |
| 0 | 209 |
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210 if (dump_file && (dump_flags & TDF_DETAILS)) |
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211 { |
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212 fprintf (dump_file, " for edge defining "); |
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213 print_generic_expr (dump_file, PHI_ARG_DEF_FROM_EDGE (phi, e), 0); |
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214 fprintf (dump_file, " inserting load "); |
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215 print_gimple_stmt (dump_file, tmp, 0, 0); |
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216 } |
| 0 | 217 } |
| 218 | |
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219 add_phi_arg (new_phi, new_var, e, locus); |
| 0 | 220 } |
| 221 | |
| 222 update_stmt (new_phi); | |
| 223 | |
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224 if (dump_file && (dump_flags & TDF_DETAILS)) |
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225 print_gimple_stmt (dump_file, new_phi, 0, 0); |
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226 |
| 0 | 227 return res; |
| 228 } | |
| 229 | |
| 230 /* Propagate between the phi node arguments of PHI in BB and phi result | |
| 231 users. For now this matches | |
| 232 # p_2 = PHI <&x, &y> | |
| 233 <Lx>:; | |
| 234 p_3 = p_2; | |
| 235 z_2 = *p_3; | |
| 236 and converts it to | |
| 237 # z_2 = PHI <x, y> | |
| 238 <Lx>:; | |
| 239 Returns true if a transformation was done and edge insertions | |
| 240 need to be committed. Global data PHIVN and N is used to track | |
| 241 past transformation results. We need to be especially careful here | |
| 242 with aliasing issues as we are moving memory reads. */ | |
| 243 | |
| 244 static bool | |
| 245 propagate_with_phi (basic_block bb, gimple phi, struct phiprop_d *phivn, | |
| 246 size_t n) | |
| 247 { | |
| 248 tree ptr = PHI_RESULT (phi); | |
| 249 gimple use_stmt; | |
| 250 tree res = NULL_TREE; | |
| 251 gimple_stmt_iterator gsi; | |
| 252 imm_use_iterator ui; | |
| 253 use_operand_p arg_p, use; | |
| 254 ssa_op_iter i; | |
| 255 bool phi_inserted; | |
|
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256 tree type = NULL_TREE; |
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257 bool one_invariant = false; |
| 0 | 258 |
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259 if (!POINTER_TYPE_P (TREE_TYPE (ptr)) |
| 0 | 260 || !is_gimple_reg_type (TREE_TYPE (TREE_TYPE (ptr)))) |
| 261 return false; | |
| 262 | |
| 263 /* Check if we can "cheaply" dereference all phi arguments. */ | |
| 264 FOR_EACH_PHI_ARG (arg_p, phi, i, SSA_OP_USE) | |
| 265 { | |
| 266 tree arg = USE_FROM_PTR (arg_p); | |
| 267 /* Walk the ssa chain until we reach a ssa name we already | |
| 268 created a value for or we reach a definition of the form | |
| 269 ssa_name_n = &var; */ | |
| 270 while (TREE_CODE (arg) == SSA_NAME | |
| 271 && !SSA_NAME_IS_DEFAULT_DEF (arg) | |
| 272 && (SSA_NAME_VERSION (arg) >= n | |
| 273 || phivn[SSA_NAME_VERSION (arg)].value == NULL_TREE)) | |
| 274 { | |
| 275 gimple def_stmt = SSA_NAME_DEF_STMT (arg); | |
| 276 if (!gimple_assign_single_p (def_stmt)) | |
| 277 return false; | |
| 278 arg = gimple_assign_rhs1 (def_stmt); | |
| 279 } | |
|
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280 if (TREE_CODE (arg) != ADDR_EXPR |
| 0 | 281 && !(TREE_CODE (arg) == SSA_NAME |
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282 && SSA_NAME_VERSION (arg) < n |
| 0 | 283 && phivn[SSA_NAME_VERSION (arg)].value != NULL_TREE |
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284 && (!type |
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285 || types_compatible_p |
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286 (type, TREE_TYPE (phivn[SSA_NAME_VERSION (arg)].value))) |
| 0 | 287 && phivn_valid_p (phivn, arg, bb))) |
| 288 return false; | |
|
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289 if (!type |
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290 && TREE_CODE (arg) == SSA_NAME) |
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291 type = TREE_TYPE (phivn[SSA_NAME_VERSION (arg)].value); |
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292 if (TREE_CODE (arg) == ADDR_EXPR |
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293 && is_gimple_min_invariant (arg)) |
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294 one_invariant = true; |
| 0 | 295 } |
| 296 | |
|
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297 /* If we neither have an address of a decl nor can reuse a previously |
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298 inserted load, do not hoist anything. */ |
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299 if (!one_invariant |
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300 && !type) |
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301 return false; |
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302 |
| 0 | 303 /* Find a dereferencing use. First follow (single use) ssa |
| 304 copy chains for ptr. */ | |
| 305 while (single_imm_use (ptr, &use, &use_stmt) | |
| 306 && gimple_assign_ssa_name_copy_p (use_stmt)) | |
| 307 ptr = gimple_assign_lhs (use_stmt); | |
| 308 | |
| 309 /* Replace the first dereference of *ptr if there is one and if we | |
| 310 can move the loads to the place of the ptr phi node. */ | |
| 311 phi_inserted = false; | |
| 312 FOR_EACH_IMM_USE_STMT (use_stmt, ui, ptr) | |
| 313 { | |
|
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314 gimple def_stmt; |
| 0 | 315 tree vuse; |
| 316 | |
| 317 /* Check whether this is a load of *ptr. */ | |
| 318 if (!(is_gimple_assign (use_stmt) | |
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319 && TREE_CODE (gimple_assign_lhs (use_stmt)) == SSA_NAME |
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320 && gimple_assign_rhs_code (use_stmt) == MEM_REF |
| 0 | 321 && TREE_OPERAND (gimple_assign_rhs1 (use_stmt), 0) == ptr |
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322 && integer_zerop (TREE_OPERAND (gimple_assign_rhs1 (use_stmt), 1)) |
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323 && (!type |
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324 || types_compatible_p |
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325 (TREE_TYPE (gimple_assign_lhs (use_stmt)), type)) |
| 0 | 326 /* We cannot replace a load that may throw or is volatile. */ |
| 327 && !stmt_can_throw_internal (use_stmt))) | |
| 328 continue; | |
| 329 | |
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330 /* Check if we can move the loads. The def stmt of the virtual use |
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331 needs to be in a different basic block dominating bb. */ |
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332 vuse = gimple_vuse (use_stmt); |
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333 def_stmt = SSA_NAME_DEF_STMT (vuse); |
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334 if (!SSA_NAME_IS_DEFAULT_DEF (vuse) |
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335 && (gimple_bb (def_stmt) == bb |
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336 || !dominated_by_p (CDI_DOMINATORS, |
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337 bb, gimple_bb (def_stmt)))) |
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338 goto next; |
| 0 | 339 |
| 340 /* Found a proper dereference. Insert a phi node if this | |
| 341 is the first load transformation. */ | |
| 342 if (!phi_inserted) | |
| 343 { | |
| 344 res = phiprop_insert_phi (bb, phi, use_stmt, phivn, n); | |
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345 type = TREE_TYPE (res); |
| 0 | 346 |
| 347 /* Remember the value we created for *ptr. */ | |
| 348 phivn[SSA_NAME_VERSION (ptr)].value = res; | |
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349 phivn[SSA_NAME_VERSION (ptr)].vuse = vuse; |
| 0 | 350 |
| 351 /* Remove old stmt. The phi is taken care of by DCE, if we | |
| 352 want to delete it here we also have to delete all intermediate | |
| 353 copies. */ | |
| 354 gsi = gsi_for_stmt (use_stmt); | |
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355 gsi_remove (&gsi, true); |
| 0 | 356 |
| 357 phi_inserted = true; | |
| 358 } | |
| 359 else | |
| 360 { | |
| 361 /* Further replacements are easy, just make a copy out of the | |
| 362 load. */ | |
| 363 gimple_assign_set_rhs1 (use_stmt, res); | |
| 364 update_stmt (use_stmt); | |
| 365 } | |
| 366 | |
| 367 next:; | |
| 368 /* Continue searching for a proper dereference. */ | |
| 369 } | |
| 370 | |
| 371 return phi_inserted; | |
| 372 } | |
| 373 | |
| 374 /* Main entry for phiprop pass. */ | |
| 375 | |
| 376 static unsigned int | |
| 377 tree_ssa_phiprop (void) | |
| 378 { | |
|
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379 VEC(basic_block, heap) *bbs; |
| 0 | 380 struct phiprop_d *phivn; |
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381 bool did_something = false; |
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382 basic_block bb; |
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383 gimple_stmt_iterator gsi; |
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384 unsigned i; |
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385 size_t n; |
| 0 | 386 |
| 387 calculate_dominance_info (CDI_DOMINATORS); | |
| 388 | |
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389 n = num_ssa_names; |
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390 phivn = XCNEWVEC (struct phiprop_d, n); |
| 0 | 391 |
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392 /* Walk the dominator tree in preorder. */ |
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393 bbs = get_all_dominated_blocks (CDI_DOMINATORS, |
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394 single_succ (ENTRY_BLOCK_PTR)); |
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395 FOR_EACH_VEC_ELT (basic_block, bbs, i, bb) |
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396 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
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397 did_something |= propagate_with_phi (bb, gsi_stmt (gsi), phivn, n); |
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398 |
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399 if (did_something) |
| 0 | 400 gsi_commit_edge_inserts (); |
| 401 | |
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402 VEC_free (basic_block, heap, bbs); |
| 0 | 403 free (phivn); |
| 404 | |
| 405 return 0; | |
| 406 } | |
| 407 | |
| 408 static bool | |
| 409 gate_phiprop (void) | |
| 410 { | |
|
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411 return flag_tree_phiprop; |
| 0 | 412 } |
| 413 | |
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414 struct gimple_opt_pass pass_phiprop = |
| 0 | 415 { |
| 416 { | |
| 417 GIMPLE_PASS, | |
| 418 "phiprop", /* name */ | |
| 419 gate_phiprop, /* gate */ | |
| 420 tree_ssa_phiprop, /* execute */ | |
| 421 NULL, /* sub */ | |
| 422 NULL, /* next */ | |
| 423 0, /* static_pass_number */ | |
| 424 TV_TREE_PHIPROP, /* tv_id */ | |
| 425 PROP_cfg | PROP_ssa, /* properties_required */ | |
| 426 0, /* properties_provided */ | |
| 427 0, /* properties_destroyed */ | |
| 428 0, /* todo_flags_start */ | |
| 429 TODO_dump_func | |
| 430 | TODO_ggc_collect | |
| 431 | TODO_update_ssa | |
| 432 | TODO_verify_ssa /* todo_flags_finish */ | |
| 433 } | |
| 434 }; |