Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-loop-unswitch.c @ 129:002ebcbc1eb4
remove test_env
| author | mir3636 |
|---|---|
| date | Tue, 15 May 2018 18:45:25 +0900 |
| parents | f6334be47118 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Loop unswitching. |
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2 Copyright (C) 2004, 2005, 2007, 2008, 2010 Free Software Foundation, Inc. |
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3 |
| 0 | 4 This file is part of GCC. |
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5 |
| 0 | 6 GCC is free software; you can redistribute it and/or modify it |
| 7 under the terms of the GNU General Public License as published by the | |
| 8 Free Software Foundation; either version 3, or (at your option) any | |
| 9 later version. | |
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10 |
| 0 | 11 GCC is distributed in the hope that it will be useful, but WITHOUT |
| 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
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15 |
| 0 | 16 You should have received a copy of the GNU General Public License |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 #include "config.h" | |
| 21 #include "system.h" | |
| 22 #include "coretypes.h" | |
| 23 #include "tm.h" | |
| 24 #include "tree.h" | |
| 25 #include "tm_p.h" | |
| 26 #include "basic-block.h" | |
| 27 #include "output.h" | |
| 28 #include "tree-flow.h" | |
| 29 #include "tree-dump.h" | |
| 30 #include "timevar.h" | |
| 31 #include "cfgloop.h" | |
| 32 #include "params.h" | |
| 33 #include "tree-pass.h" | |
| 34 #include "tree-inline.h" | |
| 35 | |
| 36 /* This file implements the loop unswitching, i.e. transformation of loops like | |
| 37 | |
| 38 while (A) | |
| 39 { | |
| 40 if (inv) | |
| 41 B; | |
| 42 | |
| 43 X; | |
| 44 | |
| 45 if (!inv) | |
| 46 C; | |
| 47 } | |
| 48 | |
| 49 where inv is the loop invariant, into | |
| 50 | |
| 51 if (inv) | |
| 52 { | |
| 53 while (A) | |
| 54 { | |
| 55 B; | |
| 56 X; | |
| 57 } | |
| 58 } | |
| 59 else | |
| 60 { | |
| 61 while (A) | |
| 62 { | |
| 63 X; | |
| 64 C; | |
| 65 } | |
| 66 } | |
| 67 | |
| 68 Inv is considered invariant iff the values it compares are both invariant; | |
| 69 tree-ssa-loop-im.c ensures that all the suitable conditions are in this | |
| 70 shape. */ | |
| 71 | |
| 72 static struct loop *tree_unswitch_loop (struct loop *, basic_block, tree); | |
| 73 static bool tree_unswitch_single_loop (struct loop *, int); | |
| 74 static tree tree_may_unswitch_on (basic_block, struct loop *); | |
| 75 | |
| 76 /* Main entry point. Perform loop unswitching on all suitable loops. */ | |
| 77 | |
| 78 unsigned int | |
| 79 tree_ssa_unswitch_loops (void) | |
| 80 { | |
| 81 loop_iterator li; | |
| 82 struct loop *loop; | |
| 83 bool changed = false; | |
| 84 | |
| 85 /* Go through inner loops (only original ones). */ | |
| 86 FOR_EACH_LOOP (li, loop, LI_ONLY_INNERMOST) | |
| 87 { | |
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88 if (dump_file && (dump_flags & TDF_DETAILS)) |
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89 fprintf (dump_file, ";; Considering loop %d\n", loop->num); |
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90 |
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91 /* Do not unswitch in cold regions. */ |
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92 if (optimize_loop_for_size_p (loop)) |
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93 { |
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94 if (dump_file && (dump_flags & TDF_DETAILS)) |
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95 fprintf (dump_file, ";; Not unswitching cold loops\n"); |
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96 continue; |
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97 } |
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98 |
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99 /* The loop should not be too large, to limit code growth. */ |
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100 if (tree_num_loop_insns (loop, &eni_size_weights) |
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101 > (unsigned) PARAM_VALUE (PARAM_MAX_UNSWITCH_INSNS)) |
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102 { |
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103 if (dump_file && (dump_flags & TDF_DETAILS)) |
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104 fprintf (dump_file, ";; Not unswitching, loop too big\n"); |
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105 continue; |
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106 } |
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107 |
| 0 | 108 changed |= tree_unswitch_single_loop (loop, 0); |
| 109 } | |
| 110 | |
| 111 if (changed) | |
| 112 return TODO_cleanup_cfg; | |
| 113 return 0; | |
| 114 } | |
| 115 | |
| 116 /* Checks whether we can unswitch LOOP on condition at end of BB -- one of its | |
| 117 basic blocks (for what it means see comments below). */ | |
| 118 | |
| 119 static tree | |
| 120 tree_may_unswitch_on (basic_block bb, struct loop *loop) | |
| 121 { | |
| 122 gimple stmt, def; | |
| 123 tree cond, use; | |
| 124 basic_block def_bb; | |
| 125 ssa_op_iter iter; | |
| 126 | |
| 127 /* BB must end in a simple conditional jump. */ | |
| 128 stmt = last_stmt (bb); | |
| 129 if (!stmt || gimple_code (stmt) != GIMPLE_COND) | |
| 130 return NULL_TREE; | |
| 131 | |
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132 /* To keep the things simple, we do not directly remove the conditions, |
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133 but just replace tests with 0 != 0 resp. 1 != 0. Prevent the infinite |
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134 loop where we would unswitch again on such a condition. */ |
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135 if (gimple_cond_true_p (stmt) || gimple_cond_false_p (stmt)) |
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136 return NULL_TREE; |
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137 |
| 0 | 138 /* Condition must be invariant. */ |
| 139 FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_USE) | |
| 140 { | |
| 141 def = SSA_NAME_DEF_STMT (use); | |
| 142 def_bb = gimple_bb (def); | |
| 143 if (def_bb | |
| 144 && flow_bb_inside_loop_p (loop, def_bb)) | |
| 145 return NULL_TREE; | |
| 146 } | |
| 147 | |
| 148 cond = build2 (gimple_cond_code (stmt), boolean_type_node, | |
| 149 gimple_cond_lhs (stmt), gimple_cond_rhs (stmt)); | |
| 150 | |
| 151 return cond; | |
| 152 } | |
| 153 | |
| 154 /* Simplifies COND using checks in front of the entry of the LOOP. Just very | |
| 155 simplish (sufficient to prevent us from duplicating loop in unswitching | |
| 156 unnecessarily). */ | |
| 157 | |
| 158 static tree | |
| 159 simplify_using_entry_checks (struct loop *loop, tree cond) | |
| 160 { | |
| 161 edge e = loop_preheader_edge (loop); | |
| 162 gimple stmt; | |
| 163 | |
| 164 while (1) | |
| 165 { | |
| 166 stmt = last_stmt (e->src); | |
| 167 if (stmt | |
| 168 && gimple_code (stmt) == GIMPLE_COND | |
| 169 && gimple_cond_code (stmt) == TREE_CODE (cond) | |
| 170 && operand_equal_p (gimple_cond_lhs (stmt), | |
| 171 TREE_OPERAND (cond, 0), 0) | |
| 172 && operand_equal_p (gimple_cond_rhs (stmt), | |
| 173 TREE_OPERAND (cond, 1), 0)) | |
| 174 return (e->flags & EDGE_TRUE_VALUE | |
| 175 ? boolean_true_node | |
| 176 : boolean_false_node); | |
| 177 | |
| 178 if (!single_pred_p (e->src)) | |
| 179 return cond; | |
| 180 | |
| 181 e = single_pred_edge (e->src); | |
| 182 if (e->src == ENTRY_BLOCK_PTR) | |
| 183 return cond; | |
| 184 } | |
| 185 } | |
| 186 | |
| 187 /* Unswitch single LOOP. NUM is number of unswitchings done; we do not allow | |
| 188 it to grow too much, it is too easy to create example on that the code would | |
| 189 grow exponentially. */ | |
| 190 | |
| 191 static bool | |
| 192 tree_unswitch_single_loop (struct loop *loop, int num) | |
| 193 { | |
| 194 basic_block *bbs; | |
| 195 struct loop *nloop; | |
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196 unsigned i, found; |
| 0 | 197 tree cond = NULL_TREE; |
| 198 gimple stmt; | |
| 199 bool changed = false; | |
| 200 | |
| 201 i = 0; | |
| 202 bbs = get_loop_body (loop); | |
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203 found = loop->num_nodes; |
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204 |
| 0 | 205 while (1) |
| 206 { | |
| 207 /* Find a bb to unswitch on. */ | |
| 208 for (; i < loop->num_nodes; i++) | |
| 209 if ((cond = tree_may_unswitch_on (bbs[i], loop))) | |
| 210 break; | |
| 211 | |
| 212 if (i == loop->num_nodes) | |
| 213 { | |
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214 if (dump_file |
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215 && num > PARAM_VALUE (PARAM_MAX_UNSWITCH_LEVEL) |
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216 && (dump_flags & TDF_DETAILS)) |
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217 fprintf (dump_file, ";; Not unswitching anymore, hit max level\n"); |
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218 |
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219 if (found == loop->num_nodes) |
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220 { |
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221 free (bbs); |
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222 return changed; |
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223 } |
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224 break; |
| 0 | 225 } |
| 226 | |
| 227 cond = simplify_using_entry_checks (loop, cond); | |
| 228 stmt = last_stmt (bbs[i]); | |
| 229 if (integer_nonzerop (cond)) | |
| 230 { | |
| 231 /* Remove false path. */ | |
| 232 gimple_cond_set_condition_from_tree (stmt, boolean_true_node); | |
| 233 changed = true; | |
| 234 } | |
| 235 else if (integer_zerop (cond)) | |
| 236 { | |
| 237 /* Remove true path. */ | |
| 238 gimple_cond_set_condition_from_tree (stmt, boolean_false_node); | |
| 239 changed = true; | |
| 240 } | |
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241 /* Do not unswitch too much. */ |
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242 else if (num > PARAM_VALUE (PARAM_MAX_UNSWITCH_LEVEL)) |
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243 { |
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244 i++; |
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245 continue; |
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246 } |
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247 /* In nested tree_unswitch_single_loop first optimize all conditions |
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248 using entry checks, then discover still reachable blocks in the |
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249 loop and find the condition only among those still reachable bbs. */ |
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250 else if (num != 0) |
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251 { |
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252 if (found == loop->num_nodes) |
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253 found = i; |
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254 i++; |
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255 continue; |
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256 } |
| 0 | 257 else |
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258 { |
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259 found = i; |
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260 break; |
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261 } |
| 0 | 262 |
| 263 update_stmt (stmt); | |
| 264 i++; | |
| 265 } | |
| 266 | |
|
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267 if (num != 0) |
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268 { |
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269 basic_block *tos, *worklist; |
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270 |
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271 /* When called recursively, first do a quick discovery |
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272 of reachable bbs after the above changes and only |
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273 consider conditions in still reachable bbs. */ |
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274 tos = worklist = XNEWVEC (basic_block, loop->num_nodes); |
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275 |
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276 for (i = 0; i < loop->num_nodes; i++) |
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277 bbs[i]->flags &= ~BB_REACHABLE; |
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278 |
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279 /* Start with marking header. */ |
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280 *tos++ = bbs[0]; |
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281 bbs[0]->flags |= BB_REACHABLE; |
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282 |
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283 /* Iterate: find everything reachable from what we've already seen |
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284 within the same innermost loop. Don't look through false edges |
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285 if condition is always true or true edges if condition is |
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286 always false. */ |
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287 while (tos != worklist) |
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288 { |
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289 basic_block b = *--tos; |
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290 edge e; |
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291 edge_iterator ei; |
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292 int flags = 0; |
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293 |
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294 if (EDGE_COUNT (b->succs) == 2) |
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295 { |
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296 gimple stmt = last_stmt (b); |
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297 if (stmt |
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298 && gimple_code (stmt) == GIMPLE_COND) |
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299 { |
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300 if (gimple_cond_true_p (stmt)) |
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301 flags = EDGE_FALSE_VALUE; |
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302 else if (gimple_cond_false_p (stmt)) |
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303 flags = EDGE_TRUE_VALUE; |
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304 } |
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305 } |
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306 |
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307 FOR_EACH_EDGE (e, ei, b->succs) |
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308 { |
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309 basic_block dest = e->dest; |
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310 |
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311 if (dest->loop_father == loop |
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312 && !(dest->flags & BB_REACHABLE) |
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313 && !(e->flags & flags)) |
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314 { |
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315 *tos++ = dest; |
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316 dest->flags |= BB_REACHABLE; |
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317 } |
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318 } |
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319 } |
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320 |
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321 free (worklist); |
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322 |
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323 /* Find a bb to unswitch on. */ |
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324 for (; found < loop->num_nodes; found++) |
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325 if ((bbs[found]->flags & BB_REACHABLE) |
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326 && (cond = tree_may_unswitch_on (bbs[found], loop))) |
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327 break; |
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328 |
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329 if (found == loop->num_nodes) |
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330 { |
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331 free (bbs); |
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332 return changed; |
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333 } |
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334 } |
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335 |
| 0 | 336 if (dump_file && (dump_flags & TDF_DETAILS)) |
| 337 fprintf (dump_file, ";; Unswitching loop\n"); | |
| 338 | |
| 339 initialize_original_copy_tables (); | |
| 340 /* Unswitch the loop on this condition. */ | |
|
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341 nloop = tree_unswitch_loop (loop, bbs[found], cond); |
| 0 | 342 if (!nloop) |
| 343 { | |
| 344 free_original_copy_tables (); | |
| 345 free (bbs); | |
| 346 return changed; | |
| 347 } | |
| 348 | |
| 349 /* Update the SSA form after unswitching. */ | |
| 350 update_ssa (TODO_update_ssa); | |
| 351 free_original_copy_tables (); | |
| 352 | |
| 353 /* Invoke itself on modified loops. */ | |
| 354 tree_unswitch_single_loop (nloop, num + 1); | |
| 355 tree_unswitch_single_loop (loop, num + 1); | |
| 356 free (bbs); | |
| 357 return true; | |
| 358 } | |
| 359 | |
| 360 /* Unswitch a LOOP w.r. to given basic block UNSWITCH_ON. We only support | |
| 361 unswitching of innermost loops. COND is the condition determining which | |
| 362 loop is entered -- the new loop is entered if COND is true. Returns NULL | |
| 363 if impossible, new loop otherwise. */ | |
| 364 | |
| 365 static struct loop * | |
| 366 tree_unswitch_loop (struct loop *loop, | |
| 367 basic_block unswitch_on, tree cond) | |
| 368 { | |
| 369 unsigned prob_true; | |
| 370 edge edge_true, edge_false; | |
| 371 | |
| 372 /* Some sanity checking. */ | |
| 373 gcc_assert (flow_bb_inside_loop_p (loop, unswitch_on)); | |
| 374 gcc_assert (EDGE_COUNT (unswitch_on->succs) == 2); | |
| 375 gcc_assert (loop->inner == NULL); | |
| 376 | |
| 377 extract_true_false_edges_from_block (unswitch_on, &edge_true, &edge_false); | |
| 378 prob_true = edge_true->probability; | |
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379 return loop_version (loop, unshare_expr (cond), |
| 0 | 380 NULL, prob_true, prob_true, |
| 381 REG_BR_PROB_BASE - prob_true, false); | |
| 382 } |