Mercurial > hg > CbC > CbC_gcc
annotate gcc/dce.c @ 131:84e7813d76e9
gcc-8.2
| author | mir3636 |
|---|---|
| date | Thu, 25 Oct 2018 07:37:49 +0900 |
| parents | 04ced10e8804 |
| children | 1830386684a0 |
| rev | line source |
|---|---|
| 0 | 1 /* RTL dead code elimination. |
| 131 | 2 Copyright (C) 2005-2018 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify it under | |
| 7 the terms of the GNU General Public License as published by the Free | |
| 8 Software Foundation; either version 3, or (at your option) any later | |
| 9 version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 12 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. | |
| 15 | |
| 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" | |
| 111 | 23 #include "backend.h" |
| 0 | 24 #include "rtl.h" |
| 25 #include "tree.h" | |
| 111 | 26 #include "predict.h" |
| 0 | 27 #include "df.h" |
| 111 | 28 #include "memmodel.h" |
| 29 #include "tm_p.h" | |
| 30 #include "emit-rtl.h" /* FIXME: Can go away once crtl is moved to rtl.h. */ | |
| 31 #include "cfgrtl.h" | |
| 32 #include "cfgbuild.h" | |
| 33 #include "cfgcleanup.h" | |
| 0 | 34 #include "dce.h" |
| 111 | 35 #include "valtrack.h" |
| 0 | 36 #include "tree-pass.h" |
| 37 #include "dbgcnt.h" | |
| 38 | |
| 39 | |
| 40 /* ------------------------------------------------------------------------- | |
| 41 Core mark/delete routines | |
| 42 ------------------------------------------------------------------------- */ | |
| 43 | |
| 44 /* True if we are invoked while the df engine is running; in this case, | |
| 45 we don't want to reenter it. */ | |
| 46 static bool df_in_progress = false; | |
| 47 | |
| 111 | 48 /* True if we are allowed to alter the CFG in this pass. */ |
| 49 static bool can_alter_cfg = false; | |
| 50 | |
| 0 | 51 /* Instructions that have been marked but whose dependencies have not |
| 52 yet been processed. */ | |
| 111 | 53 static vec<rtx_insn *> worklist; |
| 0 | 54 |
| 55 /* Bitmap of instructions marked as needed indexed by INSN_UID. */ | |
| 56 static sbitmap marked; | |
| 57 | |
| 58 /* Bitmap obstacks used for block processing by the fast algorithm. */ | |
| 59 static bitmap_obstack dce_blocks_bitmap_obstack; | |
| 60 static bitmap_obstack dce_tmp_bitmap_obstack; | |
| 61 | |
| 111 | 62 static bool find_call_stack_args (rtx_call_insn *, bool, bool, bitmap); |
| 0 | 63 |
| 64 /* A subroutine for which BODY is part of the instruction being tested; | |
| 65 either the top-level pattern, or an element of a PARALLEL. The | |
| 66 instruction is known not to be a bare USE or CLOBBER. */ | |
| 67 | |
| 68 static bool | |
| 69 deletable_insn_p_1 (rtx body) | |
| 70 { | |
| 71 switch (GET_CODE (body)) | |
| 72 { | |
| 73 case PREFETCH: | |
| 74 case TRAP_IF: | |
| 75 /* The UNSPEC case was added here because the ia-64 claims that | |
| 76 USEs do not work after reload and generates UNSPECS rather | |
| 77 than USEs. Since dce is run after reload we need to avoid | |
| 78 deleting these even if they are dead. If it turns out that | |
| 79 USEs really do work after reload, the ia-64 should be | |
| 80 changed, and the UNSPEC case can be removed. */ | |
| 81 case UNSPEC: | |
| 82 return false; | |
| 83 | |
| 84 default: | |
|
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85 return !volatile_refs_p (body); |
| 0 | 86 } |
| 87 } | |
| 88 | |
| 89 | |
| 90 /* Return true if INSN is a normal instruction that can be deleted by | |
| 91 the DCE pass. */ | |
| 92 | |
| 93 static bool | |
| 111 | 94 deletable_insn_p (rtx_insn *insn, bool fast, bitmap arg_stores) |
| 0 | 95 { |
| 96 rtx body, x; | |
| 97 int i; | |
| 111 | 98 df_ref def; |
| 0 | 99 |
| 100 if (CALL_P (insn) | |
| 101 /* We cannot delete calls inside of the recursive dce because | |
| 102 this may cause basic blocks to be deleted and this messes up | |
| 103 the rest of the stack of optimization passes. */ | |
| 104 && (!df_in_progress) | |
| 105 /* We cannot delete pure or const sibling calls because it is | |
| 106 hard to see the result. */ | |
| 107 && (!SIBLING_CALL_P (insn)) | |
| 108 /* We can delete dead const or pure calls as long as they do not | |
| 109 infinite loop. */ | |
| 110 && (RTL_CONST_OR_PURE_CALL_P (insn) | |
| 111 && !RTL_LOOPING_CONST_OR_PURE_CALL_P (insn))) | |
| 111 | 112 return find_call_stack_args (as_a <rtx_call_insn *> (insn), false, |
| 113 fast, arg_stores); | |
| 0 | 114 |
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115 /* Don't delete jumps, notes and the like. */ |
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116 if (!NONJUMP_INSN_P (insn)) |
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117 return false; |
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118 |
| 111 | 119 /* Don't delete insns that may throw if we cannot do so. */ |
| 120 if (!(cfun->can_delete_dead_exceptions && can_alter_cfg) | |
| 121 && !insn_nothrow_p (insn)) | |
|
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122 return false; |
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123 |
| 111 | 124 /* If INSN sets a global_reg, leave it untouched. */ |
| 125 FOR_EACH_INSN_DEF (def, insn) | |
| 126 if (HARD_REGISTER_NUM_P (DF_REF_REGNO (def)) | |
| 127 && global_regs[DF_REF_REGNO (def)]) | |
| 128 return false; | |
| 129 /* Initialization of pseudo PIC register should never be removed. */ | |
| 130 else if (DF_REF_REG (def) == pic_offset_table_rtx | |
| 131 && REGNO (pic_offset_table_rtx) >= FIRST_PSEUDO_REGISTER) | |
| 132 return false; | |
| 133 | |
| 131 | 134 /* Callee-save restores are needed. */ |
| 135 if (RTX_FRAME_RELATED_P (insn) | |
| 136 && crtl->shrink_wrapped_separate | |
| 137 && find_reg_note (insn, REG_CFA_RESTORE, NULL)) | |
| 138 return false; | |
| 139 | |
| 0 | 140 body = PATTERN (insn); |
| 141 switch (GET_CODE (body)) | |
| 142 { | |
| 143 case USE: | |
|
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144 case VAR_LOCATION: |
| 0 | 145 return false; |
| 146 | |
| 147 case CLOBBER: | |
| 131 | 148 case CLOBBER_HIGH: |
| 0 | 149 if (fast) |
| 150 { | |
| 151 /* A CLOBBER of a dead pseudo register serves no purpose. | |
| 152 That is not necessarily true for hard registers until | |
| 153 after reload. */ | |
| 154 x = XEXP (body, 0); | |
| 155 return REG_P (x) && (!HARD_REGISTER_P (x) || reload_completed); | |
| 156 } | |
| 157 else | |
| 158 /* Because of the way that use-def chains are built, it is not | |
| 159 possible to tell if the clobber is dead because it can | |
| 160 never be the target of a use-def chain. */ | |
| 161 return false; | |
| 162 | |
| 163 case PARALLEL: | |
| 164 for (i = XVECLEN (body, 0) - 1; i >= 0; i--) | |
| 165 if (!deletable_insn_p_1 (XVECEXP (body, 0, i))) | |
| 166 return false; | |
| 167 return true; | |
| 168 | |
| 169 default: | |
| 170 return deletable_insn_p_1 (body); | |
| 171 } | |
| 172 } | |
| 173 | |
| 174 | |
| 175 /* Return true if INSN has been marked as needed. */ | |
| 176 | |
| 177 static inline int | |
| 111 | 178 marked_insn_p (rtx_insn *insn) |
| 0 | 179 { |
| 180 /* Artificial defs are always needed and they do not have an insn. | |
| 181 We should never see them here. */ | |
| 182 gcc_assert (insn); | |
| 111 | 183 return bitmap_bit_p (marked, INSN_UID (insn)); |
| 0 | 184 } |
| 185 | |
| 186 | |
| 187 /* If INSN has not yet been marked as needed, mark it now, and add it to | |
| 188 the worklist. */ | |
| 189 | |
| 190 static void | |
| 111 | 191 mark_insn (rtx_insn *insn, bool fast) |
| 0 | 192 { |
| 193 if (!marked_insn_p (insn)) | |
| 194 { | |
| 195 if (!fast) | |
| 111 | 196 worklist.safe_push (insn); |
| 197 bitmap_set_bit (marked, INSN_UID (insn)); | |
| 0 | 198 if (dump_file) |
| 199 fprintf (dump_file, " Adding insn %d to worklist\n", INSN_UID (insn)); | |
| 200 if (CALL_P (insn) | |
| 201 && !df_in_progress | |
| 202 && !SIBLING_CALL_P (insn) | |
| 203 && (RTL_CONST_OR_PURE_CALL_P (insn) | |
| 204 && !RTL_LOOPING_CONST_OR_PURE_CALL_P (insn))) | |
| 111 | 205 find_call_stack_args (as_a <rtx_call_insn *> (insn), true, fast, NULL); |
| 0 | 206 } |
| 207 } | |
| 208 | |
| 209 | |
| 210 /* A note_stores callback used by mark_nonreg_stores. DATA is the | |
| 211 instruction containing DEST. */ | |
| 212 | |
| 213 static void | |
| 214 mark_nonreg_stores_1 (rtx dest, const_rtx pattern, void *data) | |
| 215 { | |
| 216 if (GET_CODE (pattern) != CLOBBER && !REG_P (dest)) | |
| 131 | 217 { |
| 218 gcc_checking_assert (GET_CODE (pattern) != CLOBBER_HIGH); | |
| 219 mark_insn ((rtx_insn *) data, true); | |
| 220 } | |
| 0 | 221 } |
| 222 | |
| 223 | |
| 224 /* A note_stores callback used by mark_nonreg_stores. DATA is the | |
| 225 instruction containing DEST. */ | |
| 226 | |
| 227 static void | |
| 228 mark_nonreg_stores_2 (rtx dest, const_rtx pattern, void *data) | |
| 229 { | |
| 230 if (GET_CODE (pattern) != CLOBBER && !REG_P (dest)) | |
| 131 | 231 { |
| 232 gcc_checking_assert (GET_CODE (pattern) != CLOBBER_HIGH); | |
| 233 mark_insn ((rtx_insn *) data, false); | |
| 234 } | |
| 0 | 235 } |
| 236 | |
| 237 | |
| 238 /* Mark INSN if BODY stores to a non-register destination. */ | |
| 239 | |
| 240 static void | |
| 111 | 241 mark_nonreg_stores (rtx body, rtx_insn *insn, bool fast) |
| 0 | 242 { |
| 243 if (fast) | |
| 244 note_stores (body, mark_nonreg_stores_1, insn); | |
| 245 else | |
| 246 note_stores (body, mark_nonreg_stores_2, insn); | |
| 247 } | |
| 248 | |
| 249 | |
| 111 | 250 /* Return true if a store to SIZE bytes, starting OFF bytes from stack pointer, |
|
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251 is a call argument store, and clear corresponding bits from SP_BYTES |
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252 bitmap if it is. */ |
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253 |
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254 static bool |
| 111 | 255 check_argument_store (HOST_WIDE_INT size, HOST_WIDE_INT off, |
| 256 HOST_WIDE_INT min_sp_off, HOST_WIDE_INT max_sp_off, | |
| 257 bitmap sp_bytes) | |
|
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258 { |
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259 HOST_WIDE_INT byte; |
| 111 | 260 for (byte = off; byte < off + size; byte++) |
|
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261 { |
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262 if (byte < min_sp_off |
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263 || byte >= max_sp_off |
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264 || !bitmap_clear_bit (sp_bytes, byte - min_sp_off)) |
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265 return false; |
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266 } |
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267 return true; |
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268 } |
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269 |
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270 |
| 0 | 271 /* Try to find all stack stores of CALL_INSN arguments if |
| 272 ACCUMULATE_OUTGOING_ARGS. If all stack stores have been found | |
| 273 and it is therefore safe to eliminate the call, return true, | |
| 274 otherwise return false. This function should be first called | |
| 275 with DO_MARK false, and only when the CALL_INSN is actually | |
| 276 going to be marked called again with DO_MARK true. */ | |
| 277 | |
| 278 static bool | |
| 111 | 279 find_call_stack_args (rtx_call_insn *call_insn, bool do_mark, bool fast, |
| 0 | 280 bitmap arg_stores) |
| 281 { | |
| 111 | 282 rtx p; |
| 283 rtx_insn *insn, *prev_insn; | |
| 0 | 284 bool ret; |
| 285 HOST_WIDE_INT min_sp_off, max_sp_off; | |
| 286 bitmap sp_bytes; | |
| 287 | |
| 288 gcc_assert (CALL_P (call_insn)); | |
| 289 if (!ACCUMULATE_OUTGOING_ARGS) | |
| 290 return true; | |
| 291 | |
| 292 if (!do_mark) | |
| 293 { | |
| 294 gcc_assert (arg_stores); | |
| 295 bitmap_clear (arg_stores); | |
| 296 } | |
| 297 | |
| 298 min_sp_off = INTTYPE_MAXIMUM (HOST_WIDE_INT); | |
| 299 max_sp_off = 0; | |
| 300 | |
| 301 /* First determine the minimum and maximum offset from sp for | |
| 302 stored arguments. */ | |
| 303 for (p = CALL_INSN_FUNCTION_USAGE (call_insn); p; p = XEXP (p, 1)) | |
| 304 if (GET_CODE (XEXP (p, 0)) == USE | |
| 305 && MEM_P (XEXP (XEXP (p, 0), 0))) | |
| 306 { | |
| 111 | 307 rtx mem = XEXP (XEXP (p, 0), 0), addr; |
| 308 HOST_WIDE_INT off = 0, size; | |
| 131 | 309 if (!MEM_SIZE_KNOWN_P (mem) || !MEM_SIZE (mem).is_constant (&size)) |
| 111 | 310 return false; |
| 0 | 311 addr = XEXP (mem, 0); |
| 312 if (GET_CODE (addr) == PLUS | |
| 313 && REG_P (XEXP (addr, 0)) | |
| 314 && CONST_INT_P (XEXP (addr, 1))) | |
| 315 { | |
| 316 off = INTVAL (XEXP (addr, 1)); | |
| 317 addr = XEXP (addr, 0); | |
| 318 } | |
| 319 if (addr != stack_pointer_rtx) | |
| 320 { | |
| 321 if (!REG_P (addr)) | |
| 322 return false; | |
| 323 /* If not fast, use chains to see if addr wasn't set to | |
| 324 sp + offset. */ | |
| 325 if (!fast) | |
| 326 { | |
| 111 | 327 df_ref use; |
| 0 | 328 struct df_link *defs; |
| 329 rtx set; | |
| 330 | |
| 111 | 331 FOR_EACH_INSN_USE (use, call_insn) |
| 332 if (rtx_equal_p (addr, DF_REF_REG (use))) | |
| 0 | 333 break; |
| 334 | |
| 111 | 335 if (use == NULL) |
| 0 | 336 return false; |
| 337 | |
| 111 | 338 for (defs = DF_REF_CHAIN (use); defs; defs = defs->next) |
| 0 | 339 if (! DF_REF_IS_ARTIFICIAL (defs->ref)) |
| 340 break; | |
| 341 | |
| 342 if (defs == NULL) | |
| 343 return false; | |
| 344 | |
| 345 set = single_set (DF_REF_INSN (defs->ref)); | |
| 346 if (!set) | |
| 347 return false; | |
| 348 | |
| 349 if (GET_CODE (SET_SRC (set)) != PLUS | |
| 350 || XEXP (SET_SRC (set), 0) != stack_pointer_rtx | |
| 351 || !CONST_INT_P (XEXP (SET_SRC (set), 1))) | |
| 352 return false; | |
| 353 | |
| 354 off += INTVAL (XEXP (SET_SRC (set), 1)); | |
| 355 } | |
| 356 else | |
| 357 return false; | |
| 358 } | |
| 359 min_sp_off = MIN (min_sp_off, off); | |
| 111 | 360 max_sp_off = MAX (max_sp_off, off + size); |
| 0 | 361 } |
| 362 | |
| 363 if (min_sp_off >= max_sp_off) | |
| 364 return true; | |
| 365 sp_bytes = BITMAP_ALLOC (NULL); | |
| 366 | |
| 367 /* Set bits in SP_BYTES bitmap for bytes relative to sp + min_sp_off | |
| 368 which contain arguments. Checking has been done in the previous | |
| 369 loop. */ | |
| 370 for (p = CALL_INSN_FUNCTION_USAGE (call_insn); p; p = XEXP (p, 1)) | |
| 371 if (GET_CODE (XEXP (p, 0)) == USE | |
| 372 && MEM_P (XEXP (XEXP (p, 0), 0))) | |
| 373 { | |
| 374 rtx mem = XEXP (XEXP (p, 0), 0), addr; | |
| 131 | 375 HOST_WIDE_INT off = 0, byte, size; |
| 376 /* Checked in the previous iteration. */ | |
| 377 size = MEM_SIZE (mem).to_constant (); | |
| 0 | 378 addr = XEXP (mem, 0); |
| 379 if (GET_CODE (addr) == PLUS | |
| 380 && REG_P (XEXP (addr, 0)) | |
| 381 && CONST_INT_P (XEXP (addr, 1))) | |
| 382 { | |
| 383 off = INTVAL (XEXP (addr, 1)); | |
| 384 addr = XEXP (addr, 0); | |
| 385 } | |
| 386 if (addr != stack_pointer_rtx) | |
| 387 { | |
| 111 | 388 df_ref use; |
| 0 | 389 struct df_link *defs; |
| 390 rtx set; | |
| 391 | |
| 111 | 392 FOR_EACH_INSN_USE (use, call_insn) |
| 393 if (rtx_equal_p (addr, DF_REF_REG (use))) | |
| 0 | 394 break; |
| 395 | |
| 111 | 396 for (defs = DF_REF_CHAIN (use); defs; defs = defs->next) |
| 0 | 397 if (! DF_REF_IS_ARTIFICIAL (defs->ref)) |
| 398 break; | |
| 399 | |
| 400 set = single_set (DF_REF_INSN (defs->ref)); | |
| 401 off += INTVAL (XEXP (SET_SRC (set), 1)); | |
| 402 } | |
| 131 | 403 for (byte = off; byte < off + size; byte++) |
| 0 | 404 { |
|
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405 if (!bitmap_set_bit (sp_bytes, byte - min_sp_off)) |
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406 gcc_unreachable (); |
| 0 | 407 } |
| 408 } | |
| 409 | |
| 410 /* Walk backwards, looking for argument stores. The search stops | |
| 411 when seeing another call, sp adjustment or memory store other than | |
| 412 argument store. */ | |
| 413 ret = false; | |
| 414 for (insn = PREV_INSN (call_insn); insn; insn = prev_insn) | |
| 415 { | |
| 416 rtx set, mem, addr; | |
|
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|
417 HOST_WIDE_INT off; |
| 0 | 418 |
| 419 if (insn == BB_HEAD (BLOCK_FOR_INSN (call_insn))) | |
| 111 | 420 prev_insn = NULL; |
| 0 | 421 else |
| 422 prev_insn = PREV_INSN (insn); | |
| 423 | |
| 424 if (CALL_P (insn)) | |
| 425 break; | |
| 426 | |
|
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427 if (!NONDEBUG_INSN_P (insn)) |
| 0 | 428 continue; |
| 429 | |
| 430 set = single_set (insn); | |
| 431 if (!set || SET_DEST (set) == stack_pointer_rtx) | |
| 432 break; | |
| 433 | |
| 434 if (!MEM_P (SET_DEST (set))) | |
| 435 continue; | |
| 436 | |
| 437 mem = SET_DEST (set); | |
| 438 addr = XEXP (mem, 0); | |
| 439 off = 0; | |
| 440 if (GET_CODE (addr) == PLUS | |
| 441 && REG_P (XEXP (addr, 0)) | |
| 442 && CONST_INT_P (XEXP (addr, 1))) | |
| 443 { | |
| 444 off = INTVAL (XEXP (addr, 1)); | |
| 445 addr = XEXP (addr, 0); | |
| 446 } | |
| 447 if (addr != stack_pointer_rtx) | |
| 448 { | |
| 449 if (!REG_P (addr)) | |
| 450 break; | |
| 451 if (!fast) | |
| 452 { | |
| 111 | 453 df_ref use; |
| 0 | 454 struct df_link *defs; |
| 455 rtx set; | |
| 456 | |
| 111 | 457 FOR_EACH_INSN_USE (use, insn) |
| 458 if (rtx_equal_p (addr, DF_REF_REG (use))) | |
| 0 | 459 break; |
| 460 | |
| 111 | 461 if (use == NULL) |
| 0 | 462 break; |
| 463 | |
| 111 | 464 for (defs = DF_REF_CHAIN (use); defs; defs = defs->next) |
| 0 | 465 if (! DF_REF_IS_ARTIFICIAL (defs->ref)) |
| 466 break; | |
| 467 | |
| 468 if (defs == NULL) | |
| 469 break; | |
| 470 | |
| 471 set = single_set (DF_REF_INSN (defs->ref)); | |
| 472 if (!set) | |
| 473 break; | |
| 474 | |
| 475 if (GET_CODE (SET_SRC (set)) != PLUS | |
| 476 || XEXP (SET_SRC (set), 0) != stack_pointer_rtx | |
| 477 || !CONST_INT_P (XEXP (SET_SRC (set), 1))) | |
| 478 break; | |
| 479 | |
| 480 off += INTVAL (XEXP (SET_SRC (set), 1)); | |
| 481 } | |
| 482 else | |
| 483 break; | |
| 484 } | |
| 485 | |
| 131 | 486 HOST_WIDE_INT size; |
| 111 | 487 if (!MEM_SIZE_KNOWN_P (mem) |
| 131 | 488 || !MEM_SIZE (mem).is_constant (&size) |
| 489 || !check_argument_store (size, off, min_sp_off, | |
|
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490 max_sp_off, sp_bytes)) |
| 0 | 491 break; |
| 492 | |
| 493 if (!deletable_insn_p (insn, fast, NULL)) | |
| 494 break; | |
| 495 | |
| 496 if (do_mark) | |
| 497 mark_insn (insn, fast); | |
| 498 else | |
| 499 bitmap_set_bit (arg_stores, INSN_UID (insn)); | |
| 500 | |
| 501 if (bitmap_empty_p (sp_bytes)) | |
| 502 { | |
| 503 ret = true; | |
| 504 break; | |
| 505 } | |
| 506 } | |
| 507 | |
| 508 BITMAP_FREE (sp_bytes); | |
| 509 if (!ret && arg_stores) | |
| 510 bitmap_clear (arg_stores); | |
| 511 | |
| 512 return ret; | |
| 513 } | |
| 514 | |
| 515 | |
|
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516 /* Remove all REG_EQUAL and REG_EQUIV notes referring to the registers INSN |
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517 writes to. */ |
| 0 | 518 |
| 519 static void | |
| 111 | 520 remove_reg_equal_equiv_notes_for_defs (rtx_insn *insn) |
| 0 | 521 { |
| 111 | 522 df_ref def; |
|
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523 |
| 111 | 524 FOR_EACH_INSN_DEF (def, insn) |
| 525 remove_reg_equal_equiv_notes_for_regno (DF_REF_REGNO (def)); | |
| 0 | 526 } |
| 527 | |
| 111 | 528 /* Scan all BBs for debug insns and reset those that reference values |
| 529 defined in unmarked insns. */ | |
| 530 | |
| 531 static void | |
| 532 reset_unmarked_insns_debug_uses (void) | |
| 533 { | |
| 534 basic_block bb; | |
| 535 rtx_insn *insn, *next; | |
| 536 | |
| 537 FOR_EACH_BB_REVERSE_FN (bb, cfun) | |
| 538 FOR_BB_INSNS_REVERSE_SAFE (bb, insn, next) | |
| 539 if (DEBUG_INSN_P (insn)) | |
| 540 { | |
| 541 df_ref use; | |
| 542 | |
| 543 FOR_EACH_INSN_USE (use, insn) | |
| 544 { | |
| 545 struct df_link *defs; | |
| 546 for (defs = DF_REF_CHAIN (use); defs; defs = defs->next) | |
| 547 { | |
| 548 rtx_insn *ref_insn; | |
| 549 if (DF_REF_IS_ARTIFICIAL (defs->ref)) | |
| 550 continue; | |
| 551 ref_insn = DF_REF_INSN (defs->ref); | |
| 552 if (!marked_insn_p (ref_insn)) | |
| 553 break; | |
| 554 } | |
| 555 if (!defs) | |
| 556 continue; | |
| 557 /* ??? FIXME could we propagate the values assigned to | |
| 558 each of the DEFs? */ | |
| 559 INSN_VAR_LOCATION_LOC (insn) = gen_rtx_UNKNOWN_VAR_LOC (); | |
| 560 df_insn_rescan_debug_internal (insn); | |
| 561 break; | |
| 562 } | |
| 563 } | |
| 564 } | |
| 0 | 565 |
| 566 /* Delete every instruction that hasn't been marked. */ | |
| 567 | |
| 568 static void | |
| 569 delete_unmarked_insns (void) | |
| 570 { | |
| 571 basic_block bb; | |
| 111 | 572 rtx_insn *insn, *next; |
| 0 | 573 bool must_clean = false; |
| 574 | |
| 111 | 575 FOR_EACH_BB_REVERSE_FN (bb, cfun) |
| 0 | 576 FOR_BB_INSNS_REVERSE_SAFE (bb, insn, next) |
| 111 | 577 if (NONDEBUG_INSN_P (insn)) |
| 0 | 578 { |
| 131 | 579 rtx turn_into_use = NULL_RTX; |
| 580 | |
| 0 | 581 /* Always delete no-op moves. */ |
| 582 if (noop_move_p (insn)) | |
| 131 | 583 { |
| 584 if (RTX_FRAME_RELATED_P (insn)) | |
| 585 turn_into_use | |
| 586 = find_reg_note (insn, REG_CFA_RESTORE, NULL); | |
| 587 if (turn_into_use && REG_P (XEXP (turn_into_use, 0))) | |
| 588 turn_into_use = XEXP (turn_into_use, 0); | |
| 589 else | |
| 590 turn_into_use = NULL_RTX; | |
| 591 } | |
| 0 | 592 |
| 593 /* Otherwise rely only on the DCE algorithm. */ | |
| 594 else if (marked_insn_p (insn)) | |
| 595 continue; | |
| 596 | |
| 597 /* Beware that reaching a dbg counter limit here can result | |
| 598 in miscompiled file. This occurs when a group of insns | |
| 599 must be deleted together, typically because the kept insn | |
| 600 depends on the output from the deleted insn. Deleting | |
| 601 this insns in reverse order (both at the bb level and | |
| 602 when looking at the blocks) minimizes this, but does not | |
| 603 eliminate it, since it is possible for the using insn to | |
| 604 be top of a block and the producer to be at the bottom of | |
| 605 the block. However, in most cases this will only result | |
| 606 in an uninitialized use of an insn that is dead anyway. | |
| 607 | |
| 608 However, there is one rare case that will cause a | |
| 609 miscompile: deletion of non-looping pure and constant | |
| 610 calls on a machine where ACCUMULATE_OUTGOING_ARGS is true. | |
| 611 In this case it is possible to remove the call, but leave | |
| 612 the argument pushes to the stack. Because of the changes | |
| 613 to the stack pointer, this will almost always lead to a | |
| 614 miscompile. */ | |
| 615 if (!dbg_cnt (dce)) | |
| 616 continue; | |
| 617 | |
| 618 if (dump_file) | |
| 619 fprintf (dump_file, "DCE: Deleting insn %d\n", INSN_UID (insn)); | |
| 620 | |
|
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621 /* Before we delete the insn we have to remove the REG_EQUAL notes |
| 0 | 622 for the destination regs in order to avoid dangling notes. */ |
|
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623 remove_reg_equal_equiv_notes_for_defs (insn); |
| 0 | 624 |
| 625 /* If a pure or const call is deleted, this may make the cfg | |
| 626 have unreachable blocks. We rememeber this and call | |
| 627 delete_unreachable_blocks at the end. */ | |
| 628 if (CALL_P (insn)) | |
| 629 must_clean = true; | |
| 630 | |
| 131 | 631 if (turn_into_use) |
| 632 { | |
| 633 /* Don't remove frame related noop moves if they cary | |
| 634 REG_CFA_RESTORE note, while we don't need to emit any code, | |
| 635 we need it to emit the CFI restore note. */ | |
| 636 PATTERN (insn) | |
| 637 = gen_rtx_USE (GET_MODE (turn_into_use), turn_into_use); | |
| 638 INSN_CODE (insn) = -1; | |
| 639 df_insn_rescan (insn); | |
| 640 } | |
| 641 else | |
| 642 /* Now delete the insn. */ | |
| 643 delete_insn_and_edges (insn); | |
| 0 | 644 } |
| 645 | |
| 646 /* Deleted a pure or const call. */ | |
| 647 if (must_clean) | |
| 648 delete_unreachable_blocks (); | |
| 649 } | |
| 650 | |
| 651 | |
| 652 /* Go through the instructions and mark those whose necessity is not | |
| 653 dependent on inter-instruction information. Make sure all other | |
| 654 instructions are not marked. */ | |
| 655 | |
| 656 static void | |
| 657 prescan_insns_for_dce (bool fast) | |
| 658 { | |
| 659 basic_block bb; | |
| 111 | 660 rtx_insn *insn, *prev; |
| 0 | 661 bitmap arg_stores = NULL; |
| 662 | |
| 663 if (dump_file) | |
| 664 fprintf (dump_file, "Finding needed instructions:\n"); | |
| 665 | |
| 666 if (!df_in_progress && ACCUMULATE_OUTGOING_ARGS) | |
| 667 arg_stores = BITMAP_ALLOC (NULL); | |
| 668 | |
| 111 | 669 FOR_EACH_BB_FN (bb, cfun) |
| 0 | 670 { |
| 671 FOR_BB_INSNS_REVERSE_SAFE (bb, insn, prev) | |
| 111 | 672 if (NONDEBUG_INSN_P (insn)) |
| 0 | 673 { |
| 674 /* Don't mark argument stores now. They will be marked | |
| 675 if needed when the associated CALL is marked. */ | |
| 676 if (arg_stores && bitmap_bit_p (arg_stores, INSN_UID (insn))) | |
| 677 continue; | |
| 678 if (deletable_insn_p (insn, fast, arg_stores)) | |
| 679 mark_nonreg_stores (PATTERN (insn), insn, fast); | |
| 680 else | |
| 681 mark_insn (insn, fast); | |
| 682 } | |
| 683 /* find_call_stack_args only looks at argument stores in the | |
| 684 same bb. */ | |
| 685 if (arg_stores) | |
| 686 bitmap_clear (arg_stores); | |
| 687 } | |
| 688 | |
| 689 if (arg_stores) | |
| 690 BITMAP_FREE (arg_stores); | |
| 691 | |
| 692 if (dump_file) | |
| 693 fprintf (dump_file, "Finished finding needed instructions:\n"); | |
| 694 } | |
| 695 | |
| 696 | |
| 697 /* UD-based DSE routines. */ | |
| 698 | |
| 699 /* Mark instructions that define artificially-used registers, such as | |
| 700 the frame pointer and the stack pointer. */ | |
| 701 | |
| 702 static void | |
| 703 mark_artificial_uses (void) | |
| 704 { | |
| 705 basic_block bb; | |
| 706 struct df_link *defs; | |
| 111 | 707 df_ref use; |
| 0 | 708 |
| 111 | 709 FOR_ALL_BB_FN (bb, cfun) |
| 710 FOR_EACH_ARTIFICIAL_USE (use, bb->index) | |
| 711 for (defs = DF_REF_CHAIN (use); defs; defs = defs->next) | |
| 712 if (!DF_REF_IS_ARTIFICIAL (defs->ref)) | |
| 713 mark_insn (DF_REF_INSN (defs->ref), false); | |
| 0 | 714 } |
| 715 | |
| 716 | |
| 717 /* Mark every instruction that defines a register value that INSN uses. */ | |
| 718 | |
| 719 static void | |
| 111 | 720 mark_reg_dependencies (rtx_insn *insn) |
| 0 | 721 { |
| 722 struct df_link *defs; | |
| 111 | 723 df_ref use; |
| 0 | 724 |
|
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725 if (DEBUG_INSN_P (insn)) |
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726 return; |
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727 |
| 111 | 728 FOR_EACH_INSN_USE (use, insn) |
| 0 | 729 { |
| 730 if (dump_file) | |
| 731 { | |
| 732 fprintf (dump_file, "Processing use of "); | |
| 733 print_simple_rtl (dump_file, DF_REF_REG (use)); | |
| 734 fprintf (dump_file, " in insn %d:\n", INSN_UID (insn)); | |
| 735 } | |
| 736 for (defs = DF_REF_CHAIN (use); defs; defs = defs->next) | |
| 737 if (! DF_REF_IS_ARTIFICIAL (defs->ref)) | |
| 738 mark_insn (DF_REF_INSN (defs->ref), false); | |
| 739 } | |
| 740 } | |
| 741 | |
| 742 | |
| 743 /* Initialize global variables for a new DCE pass. */ | |
| 744 | |
| 745 static void | |
| 746 init_dce (bool fast) | |
| 747 { | |
| 748 if (!df_in_progress) | |
| 749 { | |
| 750 if (!fast) | |
| 111 | 751 { |
| 752 df_set_flags (DF_RD_PRUNE_DEAD_DEFS); | |
| 753 df_chain_add_problem (DF_UD_CHAIN); | |
| 754 } | |
| 0 | 755 df_analyze (); |
| 756 } | |
| 757 | |
| 758 if (dump_file) | |
| 759 df_dump (dump_file); | |
| 760 | |
| 761 if (fast) | |
| 762 { | |
| 763 bitmap_obstack_initialize (&dce_blocks_bitmap_obstack); | |
| 764 bitmap_obstack_initialize (&dce_tmp_bitmap_obstack); | |
| 111 | 765 can_alter_cfg = false; |
| 0 | 766 } |
| 111 | 767 else |
| 768 can_alter_cfg = true; | |
| 0 | 769 |
| 770 marked = sbitmap_alloc (get_max_uid () + 1); | |
| 111 | 771 bitmap_clear (marked); |
| 0 | 772 } |
| 773 | |
| 774 | |
| 775 /* Free the data allocated by init_dce. */ | |
| 776 | |
| 777 static void | |
| 778 fini_dce (bool fast) | |
| 779 { | |
| 780 sbitmap_free (marked); | |
| 781 | |
| 782 if (fast) | |
| 783 { | |
| 784 bitmap_obstack_release (&dce_blocks_bitmap_obstack); | |
| 785 bitmap_obstack_release (&dce_tmp_bitmap_obstack); | |
| 786 } | |
| 787 } | |
| 788 | |
| 789 | |
| 790 /* UD-chain based DCE. */ | |
| 791 | |
| 792 static unsigned int | |
| 793 rest_of_handle_ud_dce (void) | |
| 794 { | |
| 111 | 795 rtx_insn *insn; |
| 0 | 796 |
| 797 init_dce (false); | |
| 798 | |
| 799 prescan_insns_for_dce (false); | |
| 800 mark_artificial_uses (); | |
| 111 | 801 while (worklist.length () > 0) |
| 0 | 802 { |
| 111 | 803 insn = worklist.pop (); |
| 0 | 804 mark_reg_dependencies (insn); |
| 805 } | |
| 111 | 806 worklist.release (); |
| 807 | |
| 131 | 808 if (MAY_HAVE_DEBUG_BIND_INSNS) |
| 111 | 809 reset_unmarked_insns_debug_uses (); |
| 0 | 810 |
| 811 /* Before any insns are deleted, we must remove the chains since | |
| 812 they are not bidirectional. */ | |
| 813 df_remove_problem (df_chain); | |
| 814 delete_unmarked_insns (); | |
| 815 | |
| 816 fini_dce (false); | |
| 817 return 0; | |
| 818 } | |
| 819 | |
| 820 | |
| 111 | 821 namespace { |
| 822 | |
| 823 const pass_data pass_data_ud_rtl_dce = | |
| 0 | 824 { |
| 111 | 825 RTL_PASS, /* type */ |
| 826 "ud_dce", /* name */ | |
| 827 OPTGROUP_NONE, /* optinfo_flags */ | |
| 828 TV_DCE, /* tv_id */ | |
| 829 0, /* properties_required */ | |
| 830 0, /* properties_provided */ | |
| 831 0, /* properties_destroyed */ | |
| 832 0, /* todo_flags_start */ | |
| 833 TODO_df_finish, /* todo_flags_finish */ | |
| 834 }; | |
| 0 | 835 |
| 111 | 836 class pass_ud_rtl_dce : public rtl_opt_pass |
| 0 | 837 { |
| 111 | 838 public: |
| 839 pass_ud_rtl_dce (gcc::context *ctxt) | |
| 840 : rtl_opt_pass (pass_data_ud_rtl_dce, ctxt) | |
| 841 {} | |
| 842 | |
| 843 /* opt_pass methods: */ | |
| 844 virtual bool gate (function *) | |
| 845 { | |
| 846 return optimize > 1 && flag_dce && dbg_cnt (dce_ud); | |
| 847 } | |
| 848 | |
| 849 virtual unsigned int execute (function *) | |
| 850 { | |
| 851 return rest_of_handle_ud_dce (); | |
| 852 } | |
| 853 | |
| 854 }; // class pass_ud_rtl_dce | |
| 855 | |
| 856 } // anon namespace | |
| 857 | |
| 858 rtl_opt_pass * | |
| 859 make_pass_ud_rtl_dce (gcc::context *ctxt) | |
| 860 { | |
| 861 return new pass_ud_rtl_dce (ctxt); | |
| 862 } | |
| 0 | 863 |
| 864 | |
| 865 /* ------------------------------------------------------------------------- | |
| 866 Fast DCE functions | |
| 867 ------------------------------------------------------------------------- */ | |
| 868 | |
| 869 /* Process basic block BB. Return true if the live_in set has | |
| 870 changed. REDO_OUT is true if the info at the bottom of the block | |
| 871 needs to be recalculated before starting. AU is the proper set of | |
| 111 | 872 artificial uses. Track global substitution of uses of dead pseudos |
| 873 in debug insns using GLOBAL_DEBUG. */ | |
| 0 | 874 |
| 875 static bool | |
| 111 | 876 word_dce_process_block (basic_block bb, bool redo_out, |
| 877 struct dead_debug_global *global_debug) | |
| 0 | 878 { |
| 879 bitmap local_live = BITMAP_ALLOC (&dce_tmp_bitmap_obstack); | |
| 111 | 880 rtx_insn *insn; |
| 0 | 881 bool block_changed; |
| 111 | 882 struct dead_debug_local debug; |
| 0 | 883 |
| 884 if (redo_out) | |
| 885 { | |
| 886 /* Need to redo the live_out set of this block if when one of | |
| 887 the succs of this block has had a change in it live in | |
| 888 set. */ | |
| 889 edge e; | |
| 890 edge_iterator ei; | |
|
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|
891 df_confluence_function_n con_fun_n = df_word_lr->problem->con_fun_n; |
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892 bitmap_clear (DF_WORD_LR_OUT (bb)); |
| 0 | 893 FOR_EACH_EDGE (e, ei, bb->succs) |
| 894 (*con_fun_n) (e); | |
| 895 } | |
| 896 | |
| 897 if (dump_file) | |
| 898 { | |
| 899 fprintf (dump_file, "processing block %d live out = ", bb->index); | |
|
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900 df_print_word_regset (dump_file, DF_WORD_LR_OUT (bb)); |
| 0 | 901 } |
| 902 | |
|
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|
903 bitmap_copy (local_live, DF_WORD_LR_OUT (bb)); |
| 111 | 904 dead_debug_local_init (&debug, NULL, global_debug); |
| 0 | 905 |
| 906 FOR_BB_INSNS_REVERSE (bb, insn) | |
| 111 | 907 if (DEBUG_INSN_P (insn)) |
| 908 { | |
| 909 df_ref use; | |
| 910 FOR_EACH_INSN_USE (use, insn) | |
| 911 if (DF_REF_REGNO (use) >= FIRST_PSEUDO_REGISTER | |
| 131 | 912 && known_eq (GET_MODE_SIZE (GET_MODE (DF_REF_REAL_REG (use))), |
| 913 2 * UNITS_PER_WORD) | |
| 111 | 914 && !bitmap_bit_p (local_live, 2 * DF_REF_REGNO (use)) |
| 915 && !bitmap_bit_p (local_live, 2 * DF_REF_REGNO (use) + 1)) | |
| 916 dead_debug_add (&debug, use, DF_REF_REGNO (use)); | |
| 917 } | |
| 918 else if (INSN_P (insn)) | |
| 0 | 919 { |
|
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920 bool any_changed; |
| 111 | 921 |
| 0 | 922 /* No matter if the instruction is needed or not, we remove |
| 923 any regno in the defs from the live set. */ | |
|
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924 any_changed = df_word_lr_simulate_defs (insn, local_live); |
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925 if (any_changed) |
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926 mark_insn (insn, true); |
| 0 | 927 |
| 928 /* On the other hand, we do not allow the dead uses to set | |
| 929 anything in local_live. */ | |
| 930 if (marked_insn_p (insn)) | |
|
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931 df_word_lr_simulate_uses (insn, local_live); |
| 0 | 932 |
| 111 | 933 /* Insert debug temps for dead REGs used in subsequent debug |
| 934 insns. We may have to emit a debug temp even if the insn | |
| 935 was marked, in case the debug use was after the point of | |
| 936 death. */ | |
| 937 if (debug.used && !bitmap_empty_p (debug.used)) | |
| 938 { | |
| 939 df_ref def; | |
| 940 | |
| 941 FOR_EACH_INSN_DEF (def, insn) | |
| 942 dead_debug_insert_temp (&debug, DF_REF_REGNO (def), insn, | |
| 943 marked_insn_p (insn) | |
| 944 && !control_flow_insn_p (insn) | |
| 945 ? DEBUG_TEMP_AFTER_WITH_REG_FORCE | |
| 946 : DEBUG_TEMP_BEFORE_WITH_VALUE); | |
| 947 } | |
| 948 | |
| 0 | 949 if (dump_file) |
| 950 { | |
|
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951 fprintf (dump_file, "finished processing insn %d live out = ", |
| 0 | 952 INSN_UID (insn)); |
|
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953 df_print_word_regset (dump_file, local_live); |
| 0 | 954 } |
| 955 } | |
|
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956 |
|
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957 block_changed = !bitmap_equal_p (local_live, DF_WORD_LR_IN (bb)); |
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958 if (block_changed) |
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959 bitmap_copy (DF_WORD_LR_IN (bb), local_live); |
| 0 | 960 |
| 111 | 961 dead_debug_local_finish (&debug, NULL); |
| 0 | 962 BITMAP_FREE (local_live); |
| 963 return block_changed; | |
| 964 } | |
| 965 | |
| 966 | |
| 967 /* Process basic block BB. Return true if the live_in set has | |
| 968 changed. REDO_OUT is true if the info at the bottom of the block | |
| 969 needs to be recalculated before starting. AU is the proper set of | |
| 111 | 970 artificial uses. Track global substitution of uses of dead pseudos |
| 971 in debug insns using GLOBAL_DEBUG. */ | |
| 0 | 972 |
| 973 static bool | |
| 111 | 974 dce_process_block (basic_block bb, bool redo_out, bitmap au, |
| 975 struct dead_debug_global *global_debug) | |
| 0 | 976 { |
| 977 bitmap local_live = BITMAP_ALLOC (&dce_tmp_bitmap_obstack); | |
| 111 | 978 rtx_insn *insn; |
| 0 | 979 bool block_changed; |
| 111 | 980 df_ref def; |
| 981 struct dead_debug_local debug; | |
| 0 | 982 |
| 983 if (redo_out) | |
| 984 { | |
| 985 /* Need to redo the live_out set of this block if when one of | |
| 986 the succs of this block has had a change in it live in | |
| 987 set. */ | |
| 988 edge e; | |
| 989 edge_iterator ei; | |
| 990 df_confluence_function_n con_fun_n = df_lr->problem->con_fun_n; | |
| 991 bitmap_clear (DF_LR_OUT (bb)); | |
| 992 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 993 (*con_fun_n) (e); | |
| 994 } | |
| 995 | |
| 996 if (dump_file) | |
| 997 { | |
| 998 fprintf (dump_file, "processing block %d lr out = ", bb->index); | |
| 999 df_print_regset (dump_file, DF_LR_OUT (bb)); | |
| 1000 } | |
| 1001 | |
| 1002 bitmap_copy (local_live, DF_LR_OUT (bb)); | |
| 1003 | |
| 1004 df_simulate_initialize_backwards (bb, local_live); | |
| 111 | 1005 dead_debug_local_init (&debug, NULL, global_debug); |
| 0 | 1006 |
| 1007 FOR_BB_INSNS_REVERSE (bb, insn) | |
| 111 | 1008 if (DEBUG_INSN_P (insn)) |
| 1009 { | |
| 1010 df_ref use; | |
| 1011 FOR_EACH_INSN_USE (use, insn) | |
| 1012 if (!bitmap_bit_p (local_live, DF_REF_REGNO (use)) | |
| 1013 && !bitmap_bit_p (au, DF_REF_REGNO (use))) | |
| 1014 dead_debug_add (&debug, use, DF_REF_REGNO (use)); | |
| 1015 } | |
| 1016 else if (INSN_P (insn)) | |
| 0 | 1017 { |
|
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1018 bool needed = marked_insn_p (insn); |
| 0 | 1019 |
| 1020 /* The insn is needed if there is someone who uses the output. */ | |
|
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1021 if (!needed) |
| 111 | 1022 FOR_EACH_INSN_DEF (def, insn) |
| 1023 if (bitmap_bit_p (local_live, DF_REF_REGNO (def)) | |
| 1024 || bitmap_bit_p (au, DF_REF_REGNO (def))) | |
|
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1025 { |
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1026 needed = true; |
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1027 mark_insn (insn, true); |
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1028 break; |
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1029 } |
|
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1030 |
| 0 | 1031 /* No matter if the instruction is needed or not, we remove |
| 1032 any regno in the defs from the live set. */ | |
| 1033 df_simulate_defs (insn, local_live); | |
| 1034 | |
| 1035 /* On the other hand, we do not allow the dead uses to set | |
| 1036 anything in local_live. */ | |
|
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1037 if (needed) |
| 0 | 1038 df_simulate_uses (insn, local_live); |
| 111 | 1039 |
| 1040 /* Insert debug temps for dead REGs used in subsequent debug | |
| 1041 insns. We may have to emit a debug temp even if the insn | |
| 1042 was marked, in case the debug use was after the point of | |
| 1043 death. */ | |
| 1044 if (debug.used && !bitmap_empty_p (debug.used)) | |
| 1045 FOR_EACH_INSN_DEF (def, insn) | |
| 1046 dead_debug_insert_temp (&debug, DF_REF_REGNO (def), insn, | |
| 1047 needed && !control_flow_insn_p (insn) | |
| 1048 ? DEBUG_TEMP_AFTER_WITH_REG_FORCE | |
| 1049 : DEBUG_TEMP_BEFORE_WITH_VALUE); | |
| 0 | 1050 } |
|
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1051 |
| 111 | 1052 dead_debug_local_finish (&debug, NULL); |
| 0 | 1053 df_simulate_finalize_backwards (bb, local_live); |
| 1054 | |
| 1055 block_changed = !bitmap_equal_p (local_live, DF_LR_IN (bb)); | |
| 1056 if (block_changed) | |
| 1057 bitmap_copy (DF_LR_IN (bb), local_live); | |
| 1058 | |
| 1059 BITMAP_FREE (local_live); | |
| 1060 return block_changed; | |
| 1061 } | |
| 1062 | |
| 1063 | |
|
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1064 /* Perform fast DCE once initialization is done. If WORD_LEVEL is |
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1065 true, use the word level dce, otherwise do it at the pseudo |
| 0 | 1066 level. */ |
| 1067 | |
| 1068 static void | |
|
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1069 fast_dce (bool word_level) |
| 0 | 1070 { |
| 1071 int *postorder = df_get_postorder (DF_BACKWARD); | |
| 1072 int n_blocks = df_get_n_blocks (DF_BACKWARD); | |
| 1073 /* The set of blocks that have been seen on this iteration. */ | |
| 1074 bitmap processed = BITMAP_ALLOC (&dce_blocks_bitmap_obstack); | |
| 1075 /* The set of blocks that need to have the out vectors reset because | |
| 1076 the in of one of their successors has changed. */ | |
| 1077 bitmap redo_out = BITMAP_ALLOC (&dce_blocks_bitmap_obstack); | |
| 1078 bitmap all_blocks = BITMAP_ALLOC (&dce_blocks_bitmap_obstack); | |
| 1079 bool global_changed = true; | |
| 1080 | |
| 1081 /* These regs are considered always live so if they end up dying | |
| 1082 because of some def, we need to bring the back again. Calling | |
| 1083 df_simulate_fixup_sets has the disadvantage of calling | |
| 1084 bb_has_eh_pred once per insn, so we cache the information | |
| 1085 here. */ | |
|
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1086 bitmap au = &df->regular_block_artificial_uses; |
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1087 bitmap au_eh = &df->eh_block_artificial_uses; |
| 0 | 1088 int i; |
| 111 | 1089 struct dead_debug_global global_debug; |
| 0 | 1090 |
| 1091 prescan_insns_for_dce (true); | |
| 1092 | |
| 1093 for (i = 0; i < n_blocks; i++) | |
| 1094 bitmap_set_bit (all_blocks, postorder[i]); | |
| 1095 | |
| 111 | 1096 dead_debug_global_init (&global_debug, NULL); |
| 1097 | |
| 0 | 1098 while (global_changed) |
| 1099 { | |
| 1100 global_changed = false; | |
| 1101 | |
| 1102 for (i = 0; i < n_blocks; i++) | |
| 1103 { | |
| 1104 int index = postorder[i]; | |
| 111 | 1105 basic_block bb = BASIC_BLOCK_FOR_FN (cfun, index); |
| 0 | 1106 bool local_changed; |
| 1107 | |
| 1108 if (index < NUM_FIXED_BLOCKS) | |
| 1109 { | |
| 1110 bitmap_set_bit (processed, index); | |
| 1111 continue; | |
| 1112 } | |
| 1113 | |
|
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1114 if (word_level) |
|
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1115 local_changed |
| 111 | 1116 = word_dce_process_block (bb, bitmap_bit_p (redo_out, index), |
| 1117 &global_debug); | |
| 0 | 1118 else |
|
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1119 local_changed |
| 0 | 1120 = dce_process_block (bb, bitmap_bit_p (redo_out, index), |
| 111 | 1121 bb_has_eh_pred (bb) ? au_eh : au, |
| 1122 &global_debug); | |
| 0 | 1123 bitmap_set_bit (processed, index); |
|
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1124 |
| 0 | 1125 if (local_changed) |
| 1126 { | |
| 1127 edge e; | |
| 1128 edge_iterator ei; | |
| 1129 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 1130 if (bitmap_bit_p (processed, e->src->index)) | |
| 1131 /* Be tricky about when we need to iterate the | |
| 1132 analysis. We only have redo the analysis if the | |
| 1133 bitmaps change at the top of a block that is the | |
| 1134 entry to a loop. */ | |
| 1135 global_changed = true; | |
| 1136 else | |
| 1137 bitmap_set_bit (redo_out, e->src->index); | |
| 1138 } | |
| 1139 } | |
|
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1140 |
| 0 | 1141 if (global_changed) |
| 1142 { | |
| 1143 /* Turn off the RUN_DCE flag to prevent recursive calls to | |
| 1144 dce. */ | |
| 1145 int old_flag = df_clear_flags (DF_LR_RUN_DCE); | |
| 1146 | |
| 1147 /* So something was deleted that requires a redo. Do it on | |
| 1148 the cheap. */ | |
| 1149 delete_unmarked_insns (); | |
| 111 | 1150 bitmap_clear (marked); |
| 0 | 1151 bitmap_clear (processed); |
| 1152 bitmap_clear (redo_out); | |
|
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1153 |
| 0 | 1154 /* We do not need to rescan any instructions. We only need |
| 1155 to redo the dataflow equations for the blocks that had a | |
| 1156 change at the top of the block. Then we need to redo the | |
|
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1157 iteration. */ |
|
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1158 if (word_level) |
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1159 df_analyze_problem (df_word_lr, all_blocks, postorder, n_blocks); |
| 0 | 1160 else |
| 1161 df_analyze_problem (df_lr, all_blocks, postorder, n_blocks); | |
| 1162 | |
| 1163 if (old_flag & DF_LR_RUN_DCE) | |
| 1164 df_set_flags (DF_LR_RUN_DCE); | |
| 1165 | |
| 1166 prescan_insns_for_dce (true); | |
| 1167 } | |
| 1168 } | |
| 1169 | |
| 111 | 1170 dead_debug_global_finish (&global_debug, NULL); |
| 1171 | |
| 0 | 1172 delete_unmarked_insns (); |
| 1173 | |
| 1174 BITMAP_FREE (processed); | |
| 1175 BITMAP_FREE (redo_out); | |
| 1176 BITMAP_FREE (all_blocks); | |
| 1177 } | |
| 1178 | |
| 1179 | |
| 1180 /* Fast register level DCE. */ | |
| 1181 | |
| 1182 static unsigned int | |
| 1183 rest_of_handle_fast_dce (void) | |
| 1184 { | |
| 1185 init_dce (true); | |
| 1186 fast_dce (false); | |
| 1187 fini_dce (true); | |
| 1188 return 0; | |
| 1189 } | |
| 1190 | |
| 1191 | |
| 1192 /* Fast byte level DCE. */ | |
| 1193 | |
|
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1194 void |
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1195 run_word_dce (void) |
| 0 | 1196 { |
|
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1197 int old_flags; |
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1198 |
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1199 if (!flag_dce) |
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1200 return; |
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1201 |
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1202 timevar_push (TV_DCE); |
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1203 old_flags = df_clear_flags (DF_DEFER_INSN_RESCAN + DF_NO_INSN_RESCAN); |
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1204 df_word_lr_add_problem (); |
| 0 | 1205 init_dce (true); |
| 1206 fast_dce (true); | |
| 1207 fini_dce (true); | |
|
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1208 df_set_flags (old_flags); |
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1209 timevar_pop (TV_DCE); |
| 0 | 1210 } |
| 1211 | |
| 1212 | |
| 1213 /* This is an internal call that is used by the df live register | |
| 1214 problem to run fast dce as a side effect of creating the live | |
| 1215 information. The stack is organized so that the lr problem is run, | |
| 1216 this pass is run, which updates the live info and the df scanning | |
| 1217 info, and then returns to allow the rest of the problems to be run. | |
| 1218 | |
| 1219 This can be called by elsewhere but it will not update the bit | |
| 1220 vectors for any other problems than LR. */ | |
| 1221 | |
| 1222 void | |
| 1223 run_fast_df_dce (void) | |
| 1224 { | |
| 1225 if (flag_dce) | |
| 1226 { | |
| 1227 /* If dce is able to delete something, it has to happen | |
| 1228 immediately. Otherwise there will be problems handling the | |
| 1229 eq_notes. */ | |
|
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1230 int old_flags = |
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1231 df_clear_flags (DF_DEFER_INSN_RESCAN + DF_NO_INSN_RESCAN); |
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changeset
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1232 |
| 0 | 1233 df_in_progress = true; |
| 1234 rest_of_handle_fast_dce (); | |
| 1235 df_in_progress = false; | |
| 1236 | |
| 1237 df_set_flags (old_flags); | |
| 1238 } | |
| 1239 } | |
| 1240 | |
| 1241 | |
| 1242 /* Run a fast DCE pass. */ | |
| 1243 | |
| 1244 void | |
| 1245 run_fast_dce (void) | |
| 1246 { | |
| 1247 if (flag_dce) | |
| 1248 rest_of_handle_fast_dce (); | |
| 1249 } | |
| 1250 | |
| 1251 | |
| 111 | 1252 namespace { |
| 1253 | |
| 1254 const pass_data pass_data_fast_rtl_dce = | |
| 0 | 1255 { |
| 111 | 1256 RTL_PASS, /* type */ |
| 1257 "rtl_dce", /* name */ | |
| 1258 OPTGROUP_NONE, /* optinfo_flags */ | |
| 1259 TV_DCE, /* tv_id */ | |
| 1260 0, /* properties_required */ | |
| 1261 0, /* properties_provided */ | |
| 1262 0, /* properties_destroyed */ | |
| 1263 0, /* todo_flags_start */ | |
| 1264 TODO_df_finish, /* todo_flags_finish */ | |
| 1265 }; | |
| 0 | 1266 |
| 111 | 1267 class pass_fast_rtl_dce : public rtl_opt_pass |
| 0 | 1268 { |
| 111 | 1269 public: |
| 1270 pass_fast_rtl_dce (gcc::context *ctxt) | |
| 1271 : rtl_opt_pass (pass_data_fast_rtl_dce, ctxt) | |
| 1272 {} | |
| 1273 | |
| 1274 /* opt_pass methods: */ | |
| 1275 virtual bool gate (function *) | |
| 1276 { | |
| 1277 return optimize > 0 && flag_dce && dbg_cnt (dce_fast); | |
| 1278 } | |
| 1279 | |
| 1280 virtual unsigned int execute (function *) | |
| 1281 { | |
| 1282 return rest_of_handle_fast_dce (); | |
| 1283 } | |
| 1284 | |
| 1285 }; // class pass_fast_rtl_dce | |
| 1286 | |
| 1287 } // anon namespace | |
| 1288 | |
| 1289 rtl_opt_pass * | |
| 1290 make_pass_fast_rtl_dce (gcc::context *ctxt) | |
| 1291 { | |
| 1292 return new pass_fast_rtl_dce (ctxt); | |
| 1293 } |