Mercurial > hg > CbC > CbC_gcc
annotate gcc/resource.c @ 120:f93fa5091070
fix conv1.c
| author | mir3636 |
|---|---|
| date | Thu, 08 Mar 2018 14:53:42 +0900 |
| parents | 04ced10e8804 |
| children | 84e7813d76e9 |
| rev | line source |
|---|---|
| 0 | 1 /* Definitions for computing resource usage of specific insns. |
| 111 | 2 Copyright (C) 1999-2017 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" |
| 111 | 25 #include "df.h" |
| 26 #include "memmodel.h" | |
| 0 | 27 #include "tm_p.h" |
| 28 #include "regs.h" | |
| 111 | 29 #include "emit-rtl.h" |
| 0 | 30 #include "resource.h" |
| 31 #include "insn-attr.h" | |
| 32 #include "params.h" | |
| 33 | |
| 34 /* This structure is used to record liveness information at the targets or | |
| 35 fallthrough insns of branches. We will most likely need the information | |
| 36 at targets again, so save them in a hash table rather than recomputing them | |
| 37 each time. */ | |
| 38 | |
| 39 struct target_info | |
| 40 { | |
| 41 int uid; /* INSN_UID of target. */ | |
| 42 struct target_info *next; /* Next info for same hash bucket. */ | |
| 43 HARD_REG_SET live_regs; /* Registers live at target. */ | |
| 44 int block; /* Basic block number containing target. */ | |
| 45 int bb_tick; /* Generation count of basic block info. */ | |
| 46 }; | |
| 47 | |
| 48 #define TARGET_HASH_PRIME 257 | |
| 49 | |
| 50 /* Indicates what resources are required at the beginning of the epilogue. */ | |
| 51 static struct resources start_of_epilogue_needs; | |
| 52 | |
| 53 /* Indicates what resources are required at function end. */ | |
| 54 static struct resources end_of_function_needs; | |
| 55 | |
| 56 /* Define the hash table itself. */ | |
| 57 static struct target_info **target_hash_table = NULL; | |
| 58 | |
| 59 /* For each basic block, we maintain a generation number of its basic | |
| 60 block info, which is updated each time we move an insn from the | |
| 61 target of a jump. This is the generation number indexed by block | |
| 62 number. */ | |
| 63 | |
| 64 static int *bb_ticks; | |
| 65 | |
| 66 /* Marks registers possibly live at the current place being scanned by | |
| 67 mark_target_live_regs. Also used by update_live_status. */ | |
| 68 | |
| 69 static HARD_REG_SET current_live_regs; | |
| 70 | |
| 71 /* Marks registers for which we have seen a REG_DEAD note but no assignment. | |
| 72 Also only used by the next two functions. */ | |
| 73 | |
| 74 static HARD_REG_SET pending_dead_regs; | |
| 75 | |
| 76 static void update_live_status (rtx, const_rtx, void *); | |
| 111 | 77 static int find_basic_block (rtx_insn *, int); |
| 78 static rtx_insn *next_insn_no_annul (rtx_insn *); | |
| 79 static rtx_insn *find_dead_or_set_registers (rtx_insn *, struct resources*, | |
| 80 rtx *, int, struct resources, | |
| 81 struct resources); | |
| 0 | 82 |
| 83 /* Utility function called from mark_target_live_regs via note_stores. | |
| 84 It deadens any CLOBBERed registers and livens any SET registers. */ | |
| 85 | |
| 86 static void | |
| 87 update_live_status (rtx dest, const_rtx x, void *data ATTRIBUTE_UNUSED) | |
| 88 { | |
| 89 int first_regno, last_regno; | |
| 90 int i; | |
| 91 | |
| 92 if (!REG_P (dest) | |
| 93 && (GET_CODE (dest) != SUBREG || !REG_P (SUBREG_REG (dest)))) | |
| 94 return; | |
| 95 | |
| 96 if (GET_CODE (dest) == SUBREG) | |
| 97 { | |
| 98 first_regno = subreg_regno (dest); | |
| 99 last_regno = first_regno + subreg_nregs (dest); | |
| 100 | |
| 101 } | |
| 102 else | |
| 103 { | |
| 104 first_regno = REGNO (dest); | |
| 111 | 105 last_regno = END_REGNO (dest); |
| 0 | 106 } |
| 107 | |
| 108 if (GET_CODE (x) == CLOBBER) | |
| 109 for (i = first_regno; i < last_regno; i++) | |
| 110 CLEAR_HARD_REG_BIT (current_live_regs, i); | |
| 111 else | |
| 112 for (i = first_regno; i < last_regno; i++) | |
| 113 { | |
| 114 SET_HARD_REG_BIT (current_live_regs, i); | |
| 115 CLEAR_HARD_REG_BIT (pending_dead_regs, i); | |
| 116 } | |
| 117 } | |
| 118 | |
| 119 /* Find the number of the basic block with correct live register | |
| 120 information that starts closest to INSN. Return -1 if we couldn't | |
| 121 find such a basic block or the beginning is more than | |
| 122 SEARCH_LIMIT instructions before INSN. Use SEARCH_LIMIT = -1 for | |
| 123 an unlimited search. | |
| 124 | |
| 125 The delay slot filling code destroys the control-flow graph so, | |
| 126 instead of finding the basic block containing INSN, we search | |
| 127 backwards toward a BARRIER where the live register information is | |
| 128 correct. */ | |
| 129 | |
| 130 static int | |
| 111 | 131 find_basic_block (rtx_insn *insn, int search_limit) |
| 0 | 132 { |
| 133 /* Scan backwards to the previous BARRIER. Then see if we can find a | |
| 134 label that starts a basic block. Return the basic block number. */ | |
| 135 for (insn = prev_nonnote_insn (insn); | |
| 136 insn && !BARRIER_P (insn) && search_limit != 0; | |
| 137 insn = prev_nonnote_insn (insn), --search_limit) | |
| 138 ; | |
| 139 | |
| 140 /* The closest BARRIER is too far away. */ | |
| 141 if (search_limit == 0) | |
| 142 return -1; | |
| 143 | |
| 144 /* The start of the function. */ | |
| 145 else if (insn == 0) | |
| 111 | 146 return ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb->index; |
| 0 | 147 |
| 148 /* See if any of the upcoming CODE_LABELs start a basic block. If we reach | |
| 149 anything other than a CODE_LABEL or note, we can't find this code. */ | |
| 150 for (insn = next_nonnote_insn (insn); | |
| 151 insn && LABEL_P (insn); | |
| 152 insn = next_nonnote_insn (insn)) | |
|
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153 if (BLOCK_FOR_INSN (insn)) |
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154 return BLOCK_FOR_INSN (insn)->index; |
| 0 | 155 |
| 156 return -1; | |
| 157 } | |
| 158 | |
| 159 /* Similar to next_insn, but ignores insns in the delay slots of | |
| 160 an annulled branch. */ | |
| 161 | |
| 111 | 162 static rtx_insn * |
| 163 next_insn_no_annul (rtx_insn *insn) | |
| 0 | 164 { |
| 165 if (insn) | |
| 166 { | |
| 167 /* If INSN is an annulled branch, skip any insns from the target | |
| 168 of the branch. */ | |
| 111 | 169 if (JUMP_P (insn) |
| 0 | 170 && INSN_ANNULLED_BRANCH_P (insn) |
| 171 && NEXT_INSN (PREV_INSN (insn)) != insn) | |
| 172 { | |
| 111 | 173 rtx_insn *next = NEXT_INSN (insn); |
| 0 | 174 |
| 111 | 175 while ((NONJUMP_INSN_P (next) || JUMP_P (next) || CALL_P (next)) |
| 0 | 176 && INSN_FROM_TARGET_P (next)) |
| 177 { | |
| 178 insn = next; | |
| 179 next = NEXT_INSN (insn); | |
| 180 } | |
| 181 } | |
| 182 | |
| 183 insn = NEXT_INSN (insn); | |
| 184 if (insn && NONJUMP_INSN_P (insn) | |
| 185 && GET_CODE (PATTERN (insn)) == SEQUENCE) | |
| 111 | 186 insn = as_a <rtx_sequence *> (PATTERN (insn))->insn (0); |
| 0 | 187 } |
| 188 | |
| 189 return insn; | |
| 190 } | |
| 191 | |
| 192 /* Given X, some rtl, and RES, a pointer to a `struct resource', mark | |
| 193 which resources are referenced by the insn. If INCLUDE_DELAYED_EFFECTS | |
| 194 is TRUE, resources used by the called routine will be included for | |
| 195 CALL_INSNs. */ | |
| 196 | |
| 197 void | |
| 198 mark_referenced_resources (rtx x, struct resources *res, | |
|
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199 bool include_delayed_effects) |
| 0 | 200 { |
| 201 enum rtx_code code = GET_CODE (x); | |
| 202 int i, j; | |
| 203 unsigned int r; | |
| 204 const char *format_ptr; | |
| 205 | |
| 206 /* Handle leaf items for which we set resource flags. Also, special-case | |
| 207 CALL, SET and CLOBBER operators. */ | |
| 208 switch (code) | |
| 209 { | |
| 210 case CONST: | |
| 111 | 211 CASE_CONST_ANY: |
| 0 | 212 case PC: |
| 213 case SYMBOL_REF: | |
| 214 case LABEL_REF: | |
| 215 return; | |
| 216 | |
| 217 case SUBREG: | |
| 218 if (!REG_P (SUBREG_REG (x))) | |
|
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219 mark_referenced_resources (SUBREG_REG (x), res, false); |
| 0 | 220 else |
| 221 { | |
| 222 unsigned int regno = subreg_regno (x); | |
| 223 unsigned int last_regno = regno + subreg_nregs (x); | |
| 224 | |
| 225 gcc_assert (last_regno <= FIRST_PSEUDO_REGISTER); | |
| 226 for (r = regno; r < last_regno; r++) | |
| 227 SET_HARD_REG_BIT (res->regs, r); | |
| 228 } | |
| 229 return; | |
| 230 | |
| 231 case REG: | |
| 232 gcc_assert (HARD_REGISTER_P (x)); | |
| 233 add_to_hard_reg_set (&res->regs, GET_MODE (x), REGNO (x)); | |
| 234 return; | |
| 235 | |
| 236 case MEM: | |
| 237 /* If this memory shouldn't change, it really isn't referencing | |
| 238 memory. */ | |
| 111 | 239 if (! MEM_READONLY_P (x)) |
| 0 | 240 res->memory = 1; |
| 241 res->volatil |= MEM_VOLATILE_P (x); | |
| 242 | |
| 243 /* Mark registers used to access memory. */ | |
|
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244 mark_referenced_resources (XEXP (x, 0), res, false); |
| 0 | 245 return; |
| 246 | |
| 247 case CC0: | |
| 248 res->cc = 1; | |
| 249 return; | |
| 250 | |
| 251 case UNSPEC_VOLATILE: | |
| 252 case TRAP_IF: | |
| 253 case ASM_INPUT: | |
| 254 /* Traditional asm's are always volatile. */ | |
| 255 res->volatil = 1; | |
| 256 break; | |
| 257 | |
| 258 case ASM_OPERANDS: | |
| 259 res->volatil |= MEM_VOLATILE_P (x); | |
| 260 | |
| 261 /* For all ASM_OPERANDS, we must traverse the vector of input operands. | |
| 262 We can not just fall through here since then we would be confused | |
| 263 by the ASM_INPUT rtx inside ASM_OPERANDS, which do not indicate | |
| 264 traditional asms unlike their normal usage. */ | |
| 265 | |
| 266 for (i = 0; i < ASM_OPERANDS_INPUT_LENGTH (x); i++) | |
|
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267 mark_referenced_resources (ASM_OPERANDS_INPUT (x, i), res, false); |
| 0 | 268 return; |
| 269 | |
| 270 case CALL: | |
| 271 /* The first operand will be a (MEM (xxx)) but doesn't really reference | |
| 272 memory. The second operand may be referenced, though. */ | |
|
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273 mark_referenced_resources (XEXP (XEXP (x, 0), 0), res, false); |
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274 mark_referenced_resources (XEXP (x, 1), res, false); |
| 0 | 275 return; |
| 276 | |
| 277 case SET: | |
| 278 /* Usually, the first operand of SET is set, not referenced. But | |
| 279 registers used to access memory are referenced. SET_DEST is | |
| 280 also referenced if it is a ZERO_EXTRACT. */ | |
| 281 | |
|
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282 mark_referenced_resources (SET_SRC (x), res, false); |
| 0 | 283 |
| 284 x = SET_DEST (x); | |
| 285 if (GET_CODE (x) == ZERO_EXTRACT | |
| 286 || GET_CODE (x) == STRICT_LOW_PART) | |
|
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287 mark_referenced_resources (x, res, false); |
| 0 | 288 else if (GET_CODE (x) == SUBREG) |
| 289 x = SUBREG_REG (x); | |
| 290 if (MEM_P (x)) | |
|
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291 mark_referenced_resources (XEXP (x, 0), res, false); |
| 0 | 292 return; |
| 293 | |
| 294 case CLOBBER: | |
| 295 return; | |
| 296 | |
| 297 case CALL_INSN: | |
| 298 if (include_delayed_effects) | |
| 299 { | |
| 300 /* A CALL references memory, the frame pointer if it exists, the | |
| 301 stack pointer, any global registers and any registers given in | |
| 302 USE insns immediately in front of the CALL. | |
| 303 | |
| 304 However, we may have moved some of the parameter loading insns | |
| 305 into the delay slot of this CALL. If so, the USE's for them | |
| 306 don't count and should be skipped. */ | |
| 111 | 307 rtx_insn *insn = PREV_INSN (as_a <rtx_insn *> (x)); |
| 308 rtx_sequence *sequence = 0; | |
| 0 | 309 int seq_size = 0; |
| 310 int i; | |
| 311 | |
| 312 /* If we are part of a delay slot sequence, point at the SEQUENCE. */ | |
| 313 if (NEXT_INSN (insn) != x) | |
| 314 { | |
| 111 | 315 sequence = as_a <rtx_sequence *> (PATTERN (NEXT_INSN (insn))); |
| 316 seq_size = sequence->len (); | |
| 0 | 317 gcc_assert (GET_CODE (sequence) == SEQUENCE); |
| 318 } | |
| 319 | |
| 320 res->memory = 1; | |
| 321 SET_HARD_REG_BIT (res->regs, STACK_POINTER_REGNUM); | |
| 322 if (frame_pointer_needed) | |
| 323 { | |
| 324 SET_HARD_REG_BIT (res->regs, FRAME_POINTER_REGNUM); | |
| 111 | 325 if (!HARD_FRAME_POINTER_IS_FRAME_POINTER) |
| 326 SET_HARD_REG_BIT (res->regs, HARD_FRAME_POINTER_REGNUM); | |
| 0 | 327 } |
| 328 | |
| 329 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
| 330 if (global_regs[i]) | |
| 331 SET_HARD_REG_BIT (res->regs, i); | |
| 332 | |
| 333 /* Check for a REG_SETJMP. If it exists, then we must | |
| 334 assume that this call can need any register. | |
| 335 | |
| 336 This is done to be more conservative about how we handle setjmp. | |
| 337 We assume that they both use and set all registers. Using all | |
| 338 registers ensures that a register will not be considered dead | |
| 339 just because it crosses a setjmp call. A register should be | |
| 340 considered dead only if the setjmp call returns nonzero. */ | |
| 341 if (find_reg_note (x, REG_SETJMP, NULL)) | |
| 342 SET_HARD_REG_SET (res->regs); | |
| 343 | |
| 344 { | |
| 345 rtx link; | |
| 346 | |
| 347 for (link = CALL_INSN_FUNCTION_USAGE (x); | |
| 348 link; | |
| 349 link = XEXP (link, 1)) | |
| 350 if (GET_CODE (XEXP (link, 0)) == USE) | |
| 351 { | |
| 352 for (i = 1; i < seq_size; i++) | |
| 353 { | |
| 111 | 354 rtx slot_pat = PATTERN (sequence->element (i)); |
| 0 | 355 if (GET_CODE (slot_pat) == SET |
| 356 && rtx_equal_p (SET_DEST (slot_pat), | |
| 357 XEXP (XEXP (link, 0), 0))) | |
| 358 break; | |
| 359 } | |
| 360 if (i >= seq_size) | |
| 361 mark_referenced_resources (XEXP (XEXP (link, 0), 0), | |
|
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362 res, false); |
| 0 | 363 } |
| 364 } | |
| 365 } | |
| 366 | |
| 367 /* ... fall through to other INSN processing ... */ | |
| 111 | 368 gcc_fallthrough (); |
| 0 | 369 |
| 370 case INSN: | |
| 371 case JUMP_INSN: | |
| 372 | |
| 111 | 373 if (GET_CODE (PATTERN (x)) == COND_EXEC) |
| 374 /* In addition to the usual references, also consider all outputs | |
| 375 as referenced, to compensate for mark_set_resources treating | |
| 376 them as killed. This is similar to ZERO_EXTRACT / STRICT_LOW_PART | |
| 377 handling, execpt that we got a partial incidence instead of a partial | |
| 378 width. */ | |
| 379 mark_set_resources (x, res, 0, | |
| 380 include_delayed_effects | |
| 381 ? MARK_SRC_DEST_CALL : MARK_SRC_DEST); | |
| 382 | |
| 0 | 383 if (! include_delayed_effects |
| 111 | 384 && INSN_REFERENCES_ARE_DELAYED (as_a <rtx_insn *> (x))) |
| 0 | 385 return; |
| 386 | |
| 387 /* No special processing, just speed up. */ | |
| 388 mark_referenced_resources (PATTERN (x), res, include_delayed_effects); | |
| 389 return; | |
| 390 | |
| 391 default: | |
| 392 break; | |
| 393 } | |
| 394 | |
| 395 /* Process each sub-expression and flag what it needs. */ | |
| 396 format_ptr = GET_RTX_FORMAT (code); | |
| 397 for (i = 0; i < GET_RTX_LENGTH (code); i++) | |
| 398 switch (*format_ptr++) | |
| 399 { | |
| 400 case 'e': | |
| 401 mark_referenced_resources (XEXP (x, i), res, include_delayed_effects); | |
| 402 break; | |
| 403 | |
| 404 case 'E': | |
| 405 for (j = 0; j < XVECLEN (x, i); j++) | |
| 406 mark_referenced_resources (XVECEXP (x, i, j), res, | |
| 407 include_delayed_effects); | |
| 408 break; | |
| 409 } | |
| 410 } | |
| 411 | |
| 412 /* A subroutine of mark_target_live_regs. Search forward from TARGET | |
| 413 looking for registers that are set before they are used. These are dead. | |
| 414 Stop after passing a few conditional jumps, and/or a small | |
| 415 number of unconditional branches. */ | |
| 416 | |
| 111 | 417 static rtx_insn * |
| 418 find_dead_or_set_registers (rtx_insn *target, struct resources *res, | |
| 0 | 419 rtx *jump_target, int jump_count, |
| 420 struct resources set, struct resources needed) | |
| 421 { | |
| 422 HARD_REG_SET scratch; | |
| 111 | 423 rtx_insn *insn; |
| 424 rtx_insn *next_insn; | |
| 425 rtx_insn *jump_insn = 0; | |
| 0 | 426 int i; |
| 427 | |
| 111 | 428 for (insn = target; insn; insn = next_insn) |
| 0 | 429 { |
| 111 | 430 rtx_insn *this_insn = insn; |
| 0 | 431 |
| 111 | 432 next_insn = NEXT_INSN (insn); |
| 0 | 433 |
| 434 /* If this instruction can throw an exception, then we don't | |
| 435 know where we might end up next. That means that we have to | |
| 436 assume that whatever we have already marked as live really is | |
| 437 live. */ | |
| 438 if (can_throw_internal (insn)) | |
| 439 break; | |
| 440 | |
| 441 switch (GET_CODE (insn)) | |
| 442 { | |
| 443 case CODE_LABEL: | |
| 444 /* After a label, any pending dead registers that weren't yet | |
| 445 used can be made dead. */ | |
| 446 AND_COMPL_HARD_REG_SET (pending_dead_regs, needed.regs); | |
| 447 AND_COMPL_HARD_REG_SET (res->regs, pending_dead_regs); | |
| 448 CLEAR_HARD_REG_SET (pending_dead_regs); | |
| 449 | |
| 450 continue; | |
| 451 | |
| 452 case BARRIER: | |
| 453 case NOTE: | |
| 454 continue; | |
| 455 | |
| 456 case INSN: | |
| 457 if (GET_CODE (PATTERN (insn)) == USE) | |
| 458 { | |
| 459 /* If INSN is a USE made by update_block, we care about the | |
| 460 underlying insn. Any registers set by the underlying insn | |
| 461 are live since the insn is being done somewhere else. */ | |
| 462 if (INSN_P (XEXP (PATTERN (insn), 0))) | |
| 463 mark_set_resources (XEXP (PATTERN (insn), 0), res, 0, | |
| 464 MARK_SRC_DEST_CALL); | |
| 465 | |
| 466 /* All other USE insns are to be ignored. */ | |
| 467 continue; | |
| 468 } | |
| 469 else if (GET_CODE (PATTERN (insn)) == CLOBBER) | |
| 470 continue; | |
| 111 | 471 else if (rtx_sequence *seq = |
| 472 dyn_cast <rtx_sequence *> (PATTERN (insn))) | |
| 0 | 473 { |
| 474 /* An unconditional jump can be used to fill the delay slot | |
| 475 of a call, so search for a JUMP_INSN in any position. */ | |
| 111 | 476 for (i = 0; i < seq->len (); i++) |
| 0 | 477 { |
| 111 | 478 this_insn = seq->insn (i); |
| 479 if (JUMP_P (this_insn)) | |
| 0 | 480 break; |
| 481 } | |
| 482 } | |
| 483 | |
| 484 default: | |
| 485 break; | |
| 486 } | |
| 487 | |
| 111 | 488 if (rtx_jump_insn *this_jump_insn = |
| 489 dyn_cast <rtx_jump_insn *> (this_insn)) | |
| 0 | 490 { |
| 491 if (jump_count++ < 10) | |
| 492 { | |
| 493 if (any_uncondjump_p (this_jump_insn) | |
| 111 | 494 || ANY_RETURN_P (PATTERN (this_jump_insn))) |
| 0 | 495 { |
| 111 | 496 rtx lab_or_return = this_jump_insn->jump_label (); |
| 497 if (ANY_RETURN_P (lab_or_return)) | |
| 498 next_insn = NULL; | |
| 499 else | |
| 500 next_insn = as_a <rtx_insn *> (lab_or_return); | |
| 0 | 501 if (jump_insn == 0) |
| 502 { | |
| 503 jump_insn = insn; | |
| 504 if (jump_target) | |
| 505 *jump_target = JUMP_LABEL (this_jump_insn); | |
| 506 } | |
| 507 } | |
| 508 else if (any_condjump_p (this_jump_insn)) | |
| 509 { | |
| 510 struct resources target_set, target_res; | |
| 511 struct resources fallthrough_res; | |
| 512 | |
| 513 /* We can handle conditional branches here by following | |
| 514 both paths, and then IOR the results of the two paths | |
| 515 together, which will give us registers that are dead | |
| 516 on both paths. Since this is expensive, we give it | |
| 517 a much higher cost than unconditional branches. The | |
| 518 cost was chosen so that we will follow at most 1 | |
| 519 conditional branch. */ | |
| 520 | |
| 521 jump_count += 4; | |
| 522 if (jump_count >= 10) | |
| 523 break; | |
| 524 | |
|
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525 mark_referenced_resources (insn, &needed, true); |
| 0 | 526 |
| 527 /* For an annulled branch, mark_set_resources ignores slots | |
| 528 filled by instructions from the target. This is correct | |
| 529 if the branch is not taken. Since we are following both | |
| 530 paths from the branch, we must also compute correct info | |
| 531 if the branch is taken. We do this by inverting all of | |
| 532 the INSN_FROM_TARGET_P bits, calling mark_set_resources, | |
| 533 and then inverting the INSN_FROM_TARGET_P bits again. */ | |
| 534 | |
| 535 if (GET_CODE (PATTERN (insn)) == SEQUENCE | |
| 536 && INSN_ANNULLED_BRANCH_P (this_jump_insn)) | |
| 537 { | |
| 111 | 538 rtx_sequence *seq = as_a <rtx_sequence *> (PATTERN (insn)); |
| 539 for (i = 1; i < seq->len (); i++) | |
| 540 INSN_FROM_TARGET_P (seq->element (i)) | |
| 541 = ! INSN_FROM_TARGET_P (seq->element (i)); | |
| 0 | 542 |
| 543 target_set = set; | |
| 544 mark_set_resources (insn, &target_set, 0, | |
| 545 MARK_SRC_DEST_CALL); | |
| 546 | |
| 111 | 547 for (i = 1; i < seq->len (); i++) |
| 548 INSN_FROM_TARGET_P (seq->element (i)) | |
| 549 = ! INSN_FROM_TARGET_P (seq->element (i)); | |
| 0 | 550 |
| 551 mark_set_resources (insn, &set, 0, MARK_SRC_DEST_CALL); | |
| 552 } | |
| 553 else | |
| 554 { | |
| 555 mark_set_resources (insn, &set, 0, MARK_SRC_DEST_CALL); | |
| 556 target_set = set; | |
| 557 } | |
| 558 | |
| 559 target_res = *res; | |
| 560 COPY_HARD_REG_SET (scratch, target_set.regs); | |
| 561 AND_COMPL_HARD_REG_SET (scratch, needed.regs); | |
| 562 AND_COMPL_HARD_REG_SET (target_res.regs, scratch); | |
| 563 | |
| 564 fallthrough_res = *res; | |
| 565 COPY_HARD_REG_SET (scratch, set.regs); | |
| 566 AND_COMPL_HARD_REG_SET (scratch, needed.regs); | |
| 567 AND_COMPL_HARD_REG_SET (fallthrough_res.regs, scratch); | |
| 568 | |
| 111 | 569 if (!ANY_RETURN_P (this_jump_insn->jump_label ())) |
| 570 find_dead_or_set_registers | |
| 571 (this_jump_insn->jump_target (), | |
| 572 &target_res, 0, jump_count, target_set, needed); | |
| 573 find_dead_or_set_registers (next_insn, | |
| 0 | 574 &fallthrough_res, 0, jump_count, |
| 575 set, needed); | |
| 576 IOR_HARD_REG_SET (fallthrough_res.regs, target_res.regs); | |
| 577 AND_HARD_REG_SET (res->regs, fallthrough_res.regs); | |
| 578 break; | |
| 579 } | |
| 580 else | |
| 581 break; | |
| 582 } | |
| 583 else | |
| 584 { | |
| 585 /* Don't try this optimization if we expired our jump count | |
| 586 above, since that would mean there may be an infinite loop | |
| 587 in the function being compiled. */ | |
| 588 jump_insn = 0; | |
| 589 break; | |
| 590 } | |
| 591 } | |
| 592 | |
|
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593 mark_referenced_resources (insn, &needed, true); |
| 0 | 594 mark_set_resources (insn, &set, 0, MARK_SRC_DEST_CALL); |
| 595 | |
| 596 COPY_HARD_REG_SET (scratch, set.regs); | |
| 597 AND_COMPL_HARD_REG_SET (scratch, needed.regs); | |
| 598 AND_COMPL_HARD_REG_SET (res->regs, scratch); | |
| 599 } | |
| 600 | |
| 601 return jump_insn; | |
| 602 } | |
| 603 | |
| 604 /* Given X, a part of an insn, and a pointer to a `struct resource', | |
| 605 RES, indicate which resources are modified by the insn. If | |
| 606 MARK_TYPE is MARK_SRC_DEST_CALL, also mark resources potentially | |
| 607 set by the called routine. | |
| 608 | |
| 609 If IN_DEST is nonzero, it means we are inside a SET. Otherwise, | |
| 610 objects are being referenced instead of set. | |
| 611 | |
| 612 We never mark the insn as modifying the condition code unless it explicitly | |
| 613 SETs CC0 even though this is not totally correct. The reason for this is | |
| 614 that we require a SET of CC0 to immediately precede the reference to CC0. | |
| 615 So if some other insn sets CC0 as a side-effect, we know it cannot affect | |
| 616 our computation and thus may be placed in a delay slot. */ | |
| 617 | |
| 618 void | |
| 619 mark_set_resources (rtx x, struct resources *res, int in_dest, | |
| 620 enum mark_resource_type mark_type) | |
| 621 { | |
| 622 enum rtx_code code; | |
| 623 int i, j; | |
| 624 unsigned int r; | |
| 625 const char *format_ptr; | |
| 626 | |
| 627 restart: | |
| 628 | |
| 629 code = GET_CODE (x); | |
| 630 | |
| 631 switch (code) | |
| 632 { | |
| 633 case NOTE: | |
| 634 case BARRIER: | |
| 635 case CODE_LABEL: | |
| 636 case USE: | |
| 111 | 637 CASE_CONST_ANY: |
| 0 | 638 case LABEL_REF: |
| 639 case SYMBOL_REF: | |
| 640 case CONST: | |
| 641 case PC: | |
| 642 /* These don't set any resources. */ | |
| 643 return; | |
| 644 | |
| 645 case CC0: | |
| 646 if (in_dest) | |
| 647 res->cc = 1; | |
| 648 return; | |
| 649 | |
| 650 case CALL_INSN: | |
| 651 /* Called routine modifies the condition code, memory, any registers | |
| 652 that aren't saved across calls, global registers and anything | |
| 653 explicitly CLOBBERed immediately after the CALL_INSN. */ | |
| 654 | |
| 655 if (mark_type == MARK_SRC_DEST_CALL) | |
| 656 { | |
| 111 | 657 rtx_call_insn *call_insn = as_a <rtx_call_insn *> (x); |
| 0 | 658 rtx link; |
| 111 | 659 HARD_REG_SET regs; |
| 0 | 660 |
| 661 res->cc = res->memory = 1; | |
| 662 | |
| 111 | 663 get_call_reg_set_usage (call_insn, ®s, regs_invalidated_by_call); |
| 664 IOR_HARD_REG_SET (res->regs, regs); | |
| 0 | 665 |
| 111 | 666 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); |
| 0 | 667 link; link = XEXP (link, 1)) |
| 668 if (GET_CODE (XEXP (link, 0)) == CLOBBER) | |
| 669 mark_set_resources (SET_DEST (XEXP (link, 0)), res, 1, | |
| 670 MARK_SRC_DEST); | |
| 671 | |
| 672 /* Check for a REG_SETJMP. If it exists, then we must | |
| 673 assume that this call can clobber any register. */ | |
| 111 | 674 if (find_reg_note (call_insn, REG_SETJMP, NULL)) |
| 0 | 675 SET_HARD_REG_SET (res->regs); |
| 676 } | |
| 677 | |
| 678 /* ... and also what its RTL says it modifies, if anything. */ | |
| 111 | 679 gcc_fallthrough (); |
| 0 | 680 |
| 681 case JUMP_INSN: | |
| 682 case INSN: | |
| 683 | |
| 684 /* An insn consisting of just a CLOBBER (or USE) is just for flow | |
| 685 and doesn't actually do anything, so we ignore it. */ | |
| 686 | |
| 687 if (mark_type != MARK_SRC_DEST_CALL | |
| 111 | 688 && INSN_SETS_ARE_DELAYED (as_a <rtx_insn *> (x))) |
| 0 | 689 return; |
| 690 | |
| 691 x = PATTERN (x); | |
| 692 if (GET_CODE (x) != USE && GET_CODE (x) != CLOBBER) | |
| 693 goto restart; | |
| 694 return; | |
| 695 | |
| 696 case SET: | |
| 697 /* If the source of a SET is a CALL, this is actually done by | |
| 698 the called routine. So only include it if we are to include the | |
| 699 effects of the calling routine. */ | |
| 700 | |
| 701 mark_set_resources (SET_DEST (x), res, | |
| 702 (mark_type == MARK_SRC_DEST_CALL | |
| 703 || GET_CODE (SET_SRC (x)) != CALL), | |
| 704 mark_type); | |
| 705 | |
| 706 mark_set_resources (SET_SRC (x), res, 0, MARK_SRC_DEST); | |
| 707 return; | |
| 708 | |
| 709 case CLOBBER: | |
| 710 mark_set_resources (XEXP (x, 0), res, 1, MARK_SRC_DEST); | |
| 711 return; | |
| 712 | |
| 713 case SEQUENCE: | |
| 111 | 714 { |
| 715 rtx_sequence *seq = as_a <rtx_sequence *> (x); | |
| 716 rtx control = seq->element (0); | |
| 717 bool annul_p = JUMP_P (control) && INSN_ANNULLED_BRANCH_P (control); | |
| 718 | |
| 719 mark_set_resources (control, res, 0, mark_type); | |
| 720 for (i = seq->len () - 1; i >= 0; --i) | |
| 721 { | |
| 722 rtx elt = seq->element (i); | |
| 723 if (!annul_p && INSN_FROM_TARGET_P (elt)) | |
| 724 mark_set_resources (elt, res, 0, mark_type); | |
| 725 } | |
| 726 } | |
| 0 | 727 return; |
| 728 | |
| 729 case POST_INC: | |
| 730 case PRE_INC: | |
| 731 case POST_DEC: | |
| 732 case PRE_DEC: | |
| 733 mark_set_resources (XEXP (x, 0), res, 1, MARK_SRC_DEST); | |
| 734 return; | |
| 735 | |
| 736 case PRE_MODIFY: | |
| 737 case POST_MODIFY: | |
| 738 mark_set_resources (XEXP (x, 0), res, 1, MARK_SRC_DEST); | |
| 739 mark_set_resources (XEXP (XEXP (x, 1), 0), res, 0, MARK_SRC_DEST); | |
| 740 mark_set_resources (XEXP (XEXP (x, 1), 1), res, 0, MARK_SRC_DEST); | |
| 741 return; | |
| 742 | |
| 743 case SIGN_EXTRACT: | |
| 744 case ZERO_EXTRACT: | |
| 745 mark_set_resources (XEXP (x, 0), res, in_dest, MARK_SRC_DEST); | |
| 746 mark_set_resources (XEXP (x, 1), res, 0, MARK_SRC_DEST); | |
| 747 mark_set_resources (XEXP (x, 2), res, 0, MARK_SRC_DEST); | |
| 748 return; | |
| 749 | |
| 750 case MEM: | |
| 751 if (in_dest) | |
| 752 { | |
| 753 res->memory = 1; | |
| 754 res->volatil |= MEM_VOLATILE_P (x); | |
| 755 } | |
| 756 | |
| 757 mark_set_resources (XEXP (x, 0), res, 0, MARK_SRC_DEST); | |
| 758 return; | |
| 759 | |
| 760 case SUBREG: | |
| 761 if (in_dest) | |
| 762 { | |
| 763 if (!REG_P (SUBREG_REG (x))) | |
| 764 mark_set_resources (SUBREG_REG (x), res, in_dest, mark_type); | |
| 765 else | |
| 766 { | |
| 767 unsigned int regno = subreg_regno (x); | |
| 768 unsigned int last_regno = regno + subreg_nregs (x); | |
| 769 | |
| 770 gcc_assert (last_regno <= FIRST_PSEUDO_REGISTER); | |
| 771 for (r = regno; r < last_regno; r++) | |
| 772 SET_HARD_REG_BIT (res->regs, r); | |
| 773 } | |
| 774 } | |
| 775 return; | |
| 776 | |
| 777 case REG: | |
| 778 if (in_dest) | |
| 779 { | |
| 780 gcc_assert (HARD_REGISTER_P (x)); | |
| 781 add_to_hard_reg_set (&res->regs, GET_MODE (x), REGNO (x)); | |
| 782 } | |
| 783 return; | |
| 784 | |
| 785 case UNSPEC_VOLATILE: | |
| 786 case ASM_INPUT: | |
| 787 /* Traditional asm's are always volatile. */ | |
| 788 res->volatil = 1; | |
| 789 return; | |
| 790 | |
| 791 case TRAP_IF: | |
| 792 res->volatil = 1; | |
| 793 break; | |
| 794 | |
| 795 case ASM_OPERANDS: | |
| 796 res->volatil |= MEM_VOLATILE_P (x); | |
| 797 | |
| 798 /* For all ASM_OPERANDS, we must traverse the vector of input operands. | |
| 799 We can not just fall through here since then we would be confused | |
| 800 by the ASM_INPUT rtx inside ASM_OPERANDS, which do not indicate | |
| 801 traditional asms unlike their normal usage. */ | |
| 802 | |
| 803 for (i = 0; i < ASM_OPERANDS_INPUT_LENGTH (x); i++) | |
| 804 mark_set_resources (ASM_OPERANDS_INPUT (x, i), res, in_dest, | |
| 805 MARK_SRC_DEST); | |
| 806 return; | |
| 807 | |
| 808 default: | |
| 809 break; | |
| 810 } | |
| 811 | |
| 812 /* Process each sub-expression and flag what it needs. */ | |
| 813 format_ptr = GET_RTX_FORMAT (code); | |
| 814 for (i = 0; i < GET_RTX_LENGTH (code); i++) | |
| 815 switch (*format_ptr++) | |
| 816 { | |
| 817 case 'e': | |
| 818 mark_set_resources (XEXP (x, i), res, in_dest, mark_type); | |
| 819 break; | |
| 820 | |
| 821 case 'E': | |
| 822 for (j = 0; j < XVECLEN (x, i); j++) | |
| 823 mark_set_resources (XVECEXP (x, i, j), res, in_dest, mark_type); | |
| 824 break; | |
| 825 } | |
| 826 } | |
| 827 | |
| 828 /* Return TRUE if INSN is a return, possibly with a filled delay slot. */ | |
| 829 | |
| 830 static bool | |
| 831 return_insn_p (const_rtx insn) | |
| 832 { | |
| 111 | 833 if (JUMP_P (insn) && ANY_RETURN_P (PATTERN (insn))) |
| 0 | 834 return true; |
| 835 | |
| 836 if (NONJUMP_INSN_P (insn) && GET_CODE (PATTERN (insn)) == SEQUENCE) | |
| 837 return return_insn_p (XVECEXP (PATTERN (insn), 0, 0)); | |
| 838 | |
| 839 return false; | |
| 840 } | |
| 841 | |
| 842 /* Set the resources that are live at TARGET. | |
| 843 | |
| 844 If TARGET is zero, we refer to the end of the current function and can | |
| 845 return our precomputed value. | |
| 846 | |
| 847 Otherwise, we try to find out what is live by consulting the basic block | |
| 848 information. This is tricky, because we must consider the actions of | |
| 849 reload and jump optimization, which occur after the basic block information | |
| 850 has been computed. | |
| 851 | |
| 852 Accordingly, we proceed as follows:: | |
| 853 | |
| 854 We find the previous BARRIER and look at all immediately following labels | |
| 855 (with no intervening active insns) to see if any of them start a basic | |
| 856 block. If we hit the start of the function first, we use block 0. | |
| 857 | |
|
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858 Once we have found a basic block and a corresponding first insn, we can |
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859 accurately compute the live status (by starting at a label following a |
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860 BARRIER, we are immune to actions taken by reload and jump.) Then we |
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861 scan all insns between that point and our target. For each CLOBBER (or |
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862 for call-clobbered regs when we pass a CALL_INSN), mark the appropriate |
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863 registers are dead. For a SET, mark them as live. |
| 0 | 864 |
| 865 We have to be careful when using REG_DEAD notes because they are not | |
| 866 updated by such things as find_equiv_reg. So keep track of registers | |
| 867 marked as dead that haven't been assigned to, and mark them dead at the | |
| 868 next CODE_LABEL since reload and jump won't propagate values across labels. | |
| 869 | |
| 870 If we cannot find the start of a basic block (should be a very rare | |
| 871 case, if it can happen at all), mark everything as potentially live. | |
| 872 | |
| 873 Next, scan forward from TARGET looking for things set or clobbered | |
| 874 before they are used. These are not live. | |
| 875 | |
| 876 Because we can be called many times on the same target, save our results | |
| 877 in a hash table indexed by INSN_UID. This is only done if the function | |
| 878 init_resource_info () was invoked before we are called. */ | |
| 879 | |
| 880 void | |
| 111 | 881 mark_target_live_regs (rtx_insn *insns, rtx target_maybe_return, struct resources *res) |
| 0 | 882 { |
| 883 int b = -1; | |
| 884 unsigned int i; | |
| 885 struct target_info *tinfo = NULL; | |
| 111 | 886 rtx_insn *insn; |
| 0 | 887 rtx jump_target; |
| 888 HARD_REG_SET scratch; | |
| 889 struct resources set, needed; | |
| 890 | |
| 891 /* Handle end of function. */ | |
| 111 | 892 if (target_maybe_return == 0 || ANY_RETURN_P (target_maybe_return)) |
| 0 | 893 { |
| 894 *res = end_of_function_needs; | |
| 895 return; | |
| 896 } | |
| 897 | |
| 111 | 898 /* We've handled the case of RETURN/SIMPLE_RETURN; we should now have an |
| 899 instruction. */ | |
| 900 rtx_insn *target = as_a <rtx_insn *> (target_maybe_return); | |
| 901 | |
| 0 | 902 /* Handle return insn. */ |
| 111 | 903 if (return_insn_p (target)) |
| 0 | 904 { |
| 905 *res = end_of_function_needs; | |
|
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906 mark_referenced_resources (target, res, false); |
| 0 | 907 return; |
| 908 } | |
| 909 | |
| 910 /* We have to assume memory is needed, but the CC isn't. */ | |
| 911 res->memory = 1; | |
| 111 | 912 res->volatil = 0; |
| 0 | 913 res->cc = 0; |
| 914 | |
| 915 /* See if we have computed this value already. */ | |
| 916 if (target_hash_table != NULL) | |
| 917 { | |
| 918 for (tinfo = target_hash_table[INSN_UID (target) % TARGET_HASH_PRIME]; | |
| 919 tinfo; tinfo = tinfo->next) | |
| 920 if (tinfo->uid == INSN_UID (target)) | |
| 921 break; | |
| 922 | |
| 923 /* Start by getting the basic block number. If we have saved | |
| 924 information, we can get it from there unless the insn at the | |
| 925 start of the basic block has been deleted. */ | |
| 926 if (tinfo && tinfo->block != -1 | |
| 111 | 927 && ! BB_HEAD (BASIC_BLOCK_FOR_FN (cfun, tinfo->block))->deleted ()) |
| 0 | 928 b = tinfo->block; |
| 929 } | |
| 930 | |
| 931 if (b == -1) | |
| 932 b = find_basic_block (target, MAX_DELAY_SLOT_LIVE_SEARCH); | |
| 933 | |
| 934 if (target_hash_table != NULL) | |
| 935 { | |
| 936 if (tinfo) | |
| 937 { | |
| 938 /* If the information is up-to-date, use it. Otherwise, we will | |
| 939 update it below. */ | |
| 940 if (b == tinfo->block && b != -1 && tinfo->bb_tick == bb_ticks[b]) | |
| 941 { | |
| 942 COPY_HARD_REG_SET (res->regs, tinfo->live_regs); | |
| 943 return; | |
| 944 } | |
| 945 } | |
| 946 else | |
| 947 { | |
| 948 /* Allocate a place to put our results and chain it into the | |
| 949 hash table. */ | |
| 950 tinfo = XNEW (struct target_info); | |
| 951 tinfo->uid = INSN_UID (target); | |
| 952 tinfo->block = b; | |
| 953 tinfo->next | |
| 954 = target_hash_table[INSN_UID (target) % TARGET_HASH_PRIME]; | |
| 955 target_hash_table[INSN_UID (target) % TARGET_HASH_PRIME] = tinfo; | |
| 956 } | |
| 957 } | |
| 958 | |
| 959 CLEAR_HARD_REG_SET (pending_dead_regs); | |
| 960 | |
| 961 /* If we found a basic block, get the live registers from it and update | |
| 962 them with anything set or killed between its start and the insn before | |
| 36 | 963 TARGET; this custom life analysis is really about registers so we need |
| 964 to use the LR problem. Otherwise, we must assume everything is live. */ | |
| 0 | 965 if (b != -1) |
| 966 { | |
| 111 | 967 regset regs_live = DF_LR_IN (BASIC_BLOCK_FOR_FN (cfun, b)); |
| 968 rtx_insn *start_insn, *stop_insn; | |
| 0 | 969 |
|
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|
970 /* Compute hard regs live at start of block. */ |
| 0 | 971 REG_SET_TO_HARD_REG_SET (current_live_regs, regs_live); |
| 972 | |
| 973 /* Get starting and ending insn, handling the case where each might | |
| 974 be a SEQUENCE. */ | |
| 111 | 975 start_insn = (b == ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb->index ? |
| 976 insns : BB_HEAD (BASIC_BLOCK_FOR_FN (cfun, b))); | |
| 0 | 977 stop_insn = target; |
| 978 | |
| 979 if (NONJUMP_INSN_P (start_insn) | |
| 980 && GET_CODE (PATTERN (start_insn)) == SEQUENCE) | |
| 111 | 981 start_insn = as_a <rtx_sequence *> (PATTERN (start_insn))->insn (0); |
| 0 | 982 |
| 983 if (NONJUMP_INSN_P (stop_insn) | |
| 984 && GET_CODE (PATTERN (stop_insn)) == SEQUENCE) | |
| 985 stop_insn = next_insn (PREV_INSN (stop_insn)); | |
| 986 | |
| 987 for (insn = start_insn; insn != stop_insn; | |
| 988 insn = next_insn_no_annul (insn)) | |
| 989 { | |
| 990 rtx link; | |
| 111 | 991 rtx_insn *real_insn = insn; |
| 0 | 992 enum rtx_code code = GET_CODE (insn); |
| 993 | |
|
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994 if (DEBUG_INSN_P (insn)) |
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995 continue; |
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996 |
| 0 | 997 /* If this insn is from the target of a branch, it isn't going to |
| 998 be used in the sequel. If it is used in both cases, this | |
| 999 test will not be true. */ | |
| 1000 if ((code == INSN || code == JUMP_INSN || code == CALL_INSN) | |
| 1001 && INSN_FROM_TARGET_P (insn)) | |
| 1002 continue; | |
| 1003 | |
| 1004 /* If this insn is a USE made by update_block, we care about the | |
| 1005 underlying insn. */ | |
| 111 | 1006 if (code == INSN |
| 1007 && GET_CODE (PATTERN (insn)) == USE | |
| 0 | 1008 && INSN_P (XEXP (PATTERN (insn), 0))) |
| 111 | 1009 real_insn = as_a <rtx_insn *> (XEXP (PATTERN (insn), 0)); |
| 0 | 1010 |
| 1011 if (CALL_P (real_insn)) | |
| 1012 { | |
| 111 | 1013 /* Values in call-clobbered registers survive a COND_EXEC CALL |
| 1014 if that is not executed; this matters for resoure use because | |
| 1015 they may be used by a complementarily (or more strictly) | |
| 1016 predicated instruction, or if the CALL is NORETURN. */ | |
| 1017 if (GET_CODE (PATTERN (real_insn)) != COND_EXEC) | |
| 1018 { | |
| 1019 HARD_REG_SET regs_invalidated_by_this_call; | |
| 1020 get_call_reg_set_usage (real_insn, | |
| 1021 ®s_invalidated_by_this_call, | |
| 1022 regs_invalidated_by_call); | |
| 1023 /* CALL clobbers all call-used regs that aren't fixed except | |
| 1024 sp, ap, and fp. Do this before setting the result of the | |
| 1025 call live. */ | |
| 1026 AND_COMPL_HARD_REG_SET (current_live_regs, | |
| 1027 regs_invalidated_by_this_call); | |
| 1028 } | |
| 0 | 1029 |
| 1030 /* A CALL_INSN sets any global register live, since it may | |
| 1031 have been modified by the call. */ | |
| 1032 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
| 1033 if (global_regs[i]) | |
| 1034 SET_HARD_REG_BIT (current_live_regs, i); | |
| 1035 } | |
| 1036 | |
| 1037 /* Mark anything killed in an insn to be deadened at the next | |
| 1038 label. Ignore USE insns; the only REG_DEAD notes will be for | |
| 1039 parameters. But they might be early. A CALL_INSN will usually | |
| 1040 clobber registers used for parameters. It isn't worth bothering | |
| 1041 with the unlikely case when it won't. */ | |
| 1042 if ((NONJUMP_INSN_P (real_insn) | |
| 1043 && GET_CODE (PATTERN (real_insn)) != USE | |
| 1044 && GET_CODE (PATTERN (real_insn)) != CLOBBER) | |
| 1045 || JUMP_P (real_insn) | |
| 1046 || CALL_P (real_insn)) | |
| 1047 { | |
| 1048 for (link = REG_NOTES (real_insn); link; link = XEXP (link, 1)) | |
| 1049 if (REG_NOTE_KIND (link) == REG_DEAD | |
| 1050 && REG_P (XEXP (link, 0)) | |
| 1051 && REGNO (XEXP (link, 0)) < FIRST_PSEUDO_REGISTER) | |
| 1052 add_to_hard_reg_set (&pending_dead_regs, | |
| 1053 GET_MODE (XEXP (link, 0)), | |
| 1054 REGNO (XEXP (link, 0))); | |
| 1055 | |
| 1056 note_stores (PATTERN (real_insn), update_live_status, NULL); | |
| 1057 | |
| 1058 /* If any registers were unused after this insn, kill them. | |
| 1059 These notes will always be accurate. */ | |
| 1060 for (link = REG_NOTES (real_insn); link; link = XEXP (link, 1)) | |
| 1061 if (REG_NOTE_KIND (link) == REG_UNUSED | |
| 1062 && REG_P (XEXP (link, 0)) | |
| 1063 && REGNO (XEXP (link, 0)) < FIRST_PSEUDO_REGISTER) | |
| 1064 remove_from_hard_reg_set (¤t_live_regs, | |
| 1065 GET_MODE (XEXP (link, 0)), | |
| 1066 REGNO (XEXP (link, 0))); | |
| 1067 } | |
| 1068 | |
| 1069 else if (LABEL_P (real_insn)) | |
| 1070 { | |
|
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1071 basic_block bb; |
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1072 |
| 0 | 1073 /* A label clobbers the pending dead registers since neither |
| 1074 reload nor jump will propagate a value across a label. */ | |
| 1075 AND_COMPL_HARD_REG_SET (current_live_regs, pending_dead_regs); | |
| 1076 CLEAR_HARD_REG_SET (pending_dead_regs); | |
|
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1077 |
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1078 /* We must conservatively assume that all registers that used |
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1079 to be live here still are. The fallthrough edge may have |
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1080 left a live register uninitialized. */ |
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1081 bb = BLOCK_FOR_INSN (real_insn); |
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1082 if (bb) |
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1083 { |
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1084 HARD_REG_SET extra_live; |
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1085 |
| 36 | 1086 REG_SET_TO_HARD_REG_SET (extra_live, DF_LR_IN (bb)); |
|
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1087 IOR_HARD_REG_SET (current_live_regs, extra_live); |
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1088 } |
| 0 | 1089 } |
| 1090 | |
| 1091 /* The beginning of the epilogue corresponds to the end of the | |
| 1092 RTL chain when there are no epilogue insns. Certain resources | |
| 1093 are implicitly required at that point. */ | |
| 1094 else if (NOTE_P (real_insn) | |
| 1095 && NOTE_KIND (real_insn) == NOTE_INSN_EPILOGUE_BEG) | |
| 1096 IOR_HARD_REG_SET (current_live_regs, start_of_epilogue_needs.regs); | |
| 1097 } | |
| 1098 | |
| 1099 COPY_HARD_REG_SET (res->regs, current_live_regs); | |
| 1100 if (tinfo != NULL) | |
| 1101 { | |
| 1102 tinfo->block = b; | |
| 1103 tinfo->bb_tick = bb_ticks[b]; | |
| 1104 } | |
| 1105 } | |
| 1106 else | |
| 1107 /* We didn't find the start of a basic block. Assume everything | |
| 1108 in use. This should happen only extremely rarely. */ | |
| 1109 SET_HARD_REG_SET (res->regs); | |
| 1110 | |
| 1111 CLEAR_RESOURCE (&set); | |
| 1112 CLEAR_RESOURCE (&needed); | |
| 1113 | |
| 111 | 1114 rtx_insn *jump_insn = find_dead_or_set_registers (target, res, &jump_target, |
| 1115 0, set, needed); | |
| 0 | 1116 |
| 1117 /* If we hit an unconditional branch, we have another way of finding out | |
| 1118 what is live: we can see what is live at the branch target and include | |
| 1119 anything used but not set before the branch. We add the live | |
| 1120 resources found using the test below to those found until now. */ | |
| 1121 | |
| 1122 if (jump_insn) | |
| 1123 { | |
| 1124 struct resources new_resources; | |
| 111 | 1125 rtx_insn *stop_insn = next_active_insn (jump_insn); |
| 0 | 1126 |
| 111 | 1127 if (!ANY_RETURN_P (jump_target)) |
| 1128 jump_target = next_active_insn (as_a<rtx_insn *> (jump_target)); | |
| 1129 mark_target_live_regs (insns, jump_target, &new_resources); | |
| 0 | 1130 CLEAR_RESOURCE (&set); |
| 1131 CLEAR_RESOURCE (&needed); | |
| 1132 | |
| 1133 /* Include JUMP_INSN in the needed registers. */ | |
| 1134 for (insn = target; insn != stop_insn; insn = next_active_insn (insn)) | |
| 1135 { | |
|
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1136 mark_referenced_resources (insn, &needed, true); |
| 0 | 1137 |
| 1138 COPY_HARD_REG_SET (scratch, needed.regs); | |
| 1139 AND_COMPL_HARD_REG_SET (scratch, set.regs); | |
| 1140 IOR_HARD_REG_SET (new_resources.regs, scratch); | |
| 1141 | |
| 1142 mark_set_resources (insn, &set, 0, MARK_SRC_DEST_CALL); | |
| 1143 } | |
| 1144 | |
| 1145 IOR_HARD_REG_SET (res->regs, new_resources.regs); | |
| 1146 } | |
| 1147 | |
| 1148 if (tinfo != NULL) | |
| 1149 { | |
| 1150 COPY_HARD_REG_SET (tinfo->live_regs, res->regs); | |
| 1151 } | |
| 1152 } | |
| 1153 | |
| 1154 /* Initialize the resources required by mark_target_live_regs (). | |
| 1155 This should be invoked before the first call to mark_target_live_regs. */ | |
| 1156 | |
| 1157 void | |
| 111 | 1158 init_resource_info (rtx_insn *epilogue_insn) |
| 0 | 1159 { |
| 1160 int i; | |
|
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1161 basic_block bb; |
| 0 | 1162 |
| 1163 /* Indicate what resources are required to be valid at the end of the current | |
| 111 | 1164 function. The condition code never is and memory always is. |
| 1165 The stack pointer is needed unless EXIT_IGNORE_STACK is true | |
| 1166 and there is an epilogue that restores the original stack pointer | |
| 1167 from the frame pointer. Registers used to return the function value | |
| 1168 are needed. Registers holding global variables are needed. */ | |
| 0 | 1169 |
| 1170 end_of_function_needs.cc = 0; | |
| 1171 end_of_function_needs.memory = 1; | |
| 1172 CLEAR_HARD_REG_SET (end_of_function_needs.regs); | |
| 1173 | |
| 1174 if (frame_pointer_needed) | |
| 1175 { | |
| 1176 SET_HARD_REG_BIT (end_of_function_needs.regs, FRAME_POINTER_REGNUM); | |
| 111 | 1177 if (!HARD_FRAME_POINTER_IS_FRAME_POINTER) |
| 1178 SET_HARD_REG_BIT (end_of_function_needs.regs, | |
| 1179 HARD_FRAME_POINTER_REGNUM); | |
| 0 | 1180 } |
| 111 | 1181 if (!(frame_pointer_needed |
| 1182 && EXIT_IGNORE_STACK | |
| 1183 && epilogue_insn | |
| 1184 && !crtl->sp_is_unchanging)) | |
| 0 | 1185 SET_HARD_REG_BIT (end_of_function_needs.regs, STACK_POINTER_REGNUM); |
| 1186 | |
| 1187 if (crtl->return_rtx != 0) | |
| 1188 mark_referenced_resources (crtl->return_rtx, | |
|
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1189 &end_of_function_needs, true); |
| 0 | 1190 |
| 1191 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
| 111 | 1192 if (global_regs[i] || EPILOGUE_USES (i)) |
| 0 | 1193 SET_HARD_REG_BIT (end_of_function_needs.regs, i); |
| 1194 | |
| 1195 /* The registers required to be live at the end of the function are | |
| 1196 represented in the flow information as being dead just prior to | |
| 1197 reaching the end of the function. For example, the return of a value | |
| 1198 might be represented by a USE of the return register immediately | |
| 1199 followed by an unconditional jump to the return label where the | |
| 1200 return label is the end of the RTL chain. The end of the RTL chain | |
| 1201 is then taken to mean that the return register is live. | |
| 1202 | |
| 1203 This sequence is no longer maintained when epilogue instructions are | |
| 1204 added to the RTL chain. To reconstruct the original meaning, the | |
| 1205 start of the epilogue (NOTE_INSN_EPILOGUE_BEG) is regarded as the | |
| 1206 point where these registers become live (start_of_epilogue_needs). | |
| 1207 If epilogue instructions are present, the registers set by those | |
| 1208 instructions won't have been processed by flow. Thus, those | |
| 1209 registers are additionally required at the end of the RTL chain | |
| 1210 (end_of_function_needs). */ | |
| 1211 | |
| 1212 start_of_epilogue_needs = end_of_function_needs; | |
| 1213 | |
| 1214 while ((epilogue_insn = next_nonnote_insn (epilogue_insn))) | |
| 1215 { | |
| 1216 mark_set_resources (epilogue_insn, &end_of_function_needs, 0, | |
| 1217 MARK_SRC_DEST_CALL); | |
| 1218 if (return_insn_p (epilogue_insn)) | |
| 1219 break; | |
| 1220 } | |
| 1221 | |
| 1222 /* Allocate and initialize the tables used by mark_target_live_regs. */ | |
| 1223 target_hash_table = XCNEWVEC (struct target_info *, TARGET_HASH_PRIME); | |
| 111 | 1224 bb_ticks = XCNEWVEC (int, last_basic_block_for_fn (cfun)); |
|
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1225 |
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1226 /* Set the BLOCK_FOR_INSN of each label that starts a basic block. */ |
| 111 | 1227 FOR_EACH_BB_FN (bb, cfun) |
|
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1228 if (LABEL_P (BB_HEAD (bb))) |
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1229 BLOCK_FOR_INSN (BB_HEAD (bb)) = bb; |
| 0 | 1230 } |
| 1231 | |
| 1232 /* Free up the resources allocated to mark_target_live_regs (). This | |
| 1233 should be invoked after the last call to mark_target_live_regs (). */ | |
| 1234 | |
| 1235 void | |
| 1236 free_resource_info (void) | |
| 1237 { | |
|
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1238 basic_block bb; |
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1239 |
| 0 | 1240 if (target_hash_table != NULL) |
| 1241 { | |
| 1242 int i; | |
| 1243 | |
| 1244 for (i = 0; i < TARGET_HASH_PRIME; ++i) | |
| 1245 { | |
| 1246 struct target_info *ti = target_hash_table[i]; | |
| 1247 | |
| 1248 while (ti) | |
| 1249 { | |
| 1250 struct target_info *next = ti->next; | |
| 1251 free (ti); | |
| 1252 ti = next; | |
| 1253 } | |
| 1254 } | |
| 1255 | |
| 1256 free (target_hash_table); | |
| 1257 target_hash_table = NULL; | |
| 1258 } | |
| 1259 | |
| 1260 if (bb_ticks != NULL) | |
| 1261 { | |
| 1262 free (bb_ticks); | |
| 1263 bb_ticks = NULL; | |
| 1264 } | |
|
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1265 |
| 111 | 1266 FOR_EACH_BB_FN (bb, cfun) |
|
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1267 if (LABEL_P (BB_HEAD (bb))) |
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1268 BLOCK_FOR_INSN (BB_HEAD (bb)) = NULL; |
| 0 | 1269 } |
| 1270 | |
| 1271 /* Clear any hashed information that we have stored for INSN. */ | |
| 1272 | |
| 1273 void | |
| 111 | 1274 clear_hashed_info_for_insn (rtx_insn *insn) |
| 0 | 1275 { |
| 1276 struct target_info *tinfo; | |
| 1277 | |
| 1278 if (target_hash_table != NULL) | |
| 1279 { | |
| 1280 for (tinfo = target_hash_table[INSN_UID (insn) % TARGET_HASH_PRIME]; | |
| 1281 tinfo; tinfo = tinfo->next) | |
| 1282 if (tinfo->uid == INSN_UID (insn)) | |
| 1283 break; | |
| 1284 | |
| 1285 if (tinfo) | |
| 1286 tinfo->block = -1; | |
| 1287 } | |
| 1288 } | |
| 1289 | |
| 1290 /* Increment the tick count for the basic block that contains INSN. */ | |
| 1291 | |
| 1292 void | |
| 111 | 1293 incr_ticks_for_insn (rtx_insn *insn) |
| 0 | 1294 { |
| 1295 int b = find_basic_block (insn, MAX_DELAY_SLOT_LIVE_SEARCH); | |
| 1296 | |
| 1297 if (b != -1) | |
| 1298 bb_ticks[b]++; | |
| 1299 } | |
| 1300 | |
| 1301 /* Add TRIAL to the set of resources used at the end of the current | |
| 1302 function. */ | |
| 1303 void | |
|
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1304 mark_end_of_function_resources (rtx trial, bool include_delayed_effects) |
| 0 | 1305 { |
| 1306 mark_referenced_resources (trial, &end_of_function_needs, | |
| 1307 include_delayed_effects); | |
| 1308 } |