Mercurial > hg > CbC > CbC_gcc
annotate gcc/ira-lives.c @ 36:855418dad1a3
gcc-4.4-20091020
| author | e075725 |
|---|---|
| date | Tue, 22 Dec 2009 21:19:31 +0900 |
| parents | 58ad6c70ea60 |
| children | 77e2b8dfacca |
| rev | line source |
|---|---|
| 0 | 1 /* IRA processing allocno lives to build allocno live ranges. |
| 2 Copyright (C) 2006, 2007, 2008, 2009 | |
| 3 Free Software Foundation, Inc. | |
| 4 Contributed by Vladimir Makarov <vmakarov@redhat.com>. | |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify it under | |
| 9 the terms of the GNU General Public License as published by the Free | |
| 10 Software Foundation; either version 3, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 #include "config.h" | |
| 23 #include "system.h" | |
| 24 #include "coretypes.h" | |
| 25 #include "tm.h" | |
| 26 #include "regs.h" | |
| 27 #include "rtl.h" | |
| 28 #include "tm_p.h" | |
| 29 #include "target.h" | |
| 30 #include "flags.h" | |
| 31 #include "except.h" | |
| 32 #include "hard-reg-set.h" | |
| 33 #include "basic-block.h" | |
| 34 #include "insn-config.h" | |
| 35 #include "recog.h" | |
| 36 #include "toplev.h" | |
| 37 #include "params.h" | |
| 38 #include "df.h" | |
| 39 #include "sparseset.h" | |
| 40 #include "ira-int.h" | |
| 41 | |
| 42 /* The code in this file is similar to one in global but the code | |
| 43 works on the allocno basis and creates live ranges instead of | |
| 44 pseudo-register conflicts. */ | |
| 45 | |
| 46 /* Program points are enumerated by numbers from range | |
| 47 0..IRA_MAX_POINT-1. There are approximately two times more program | |
| 48 points than insns. Program points are places in the program where | |
| 49 liveness info can be changed. In most general case (there are more | |
| 50 complicated cases too) some program points correspond to places | |
| 51 where input operand dies and other ones correspond to places where | |
| 52 output operands are born. */ | |
| 53 int ira_max_point; | |
| 54 | |
| 55 /* Arrays of size IRA_MAX_POINT mapping a program point to the allocno | |
| 56 live ranges with given start/finish point. */ | |
| 57 allocno_live_range_t *ira_start_point_ranges, *ira_finish_point_ranges; | |
| 58 | |
| 59 /* Number of the current program point. */ | |
| 60 static int curr_point; | |
| 61 | |
| 62 /* Point where register pressure excess started or -1 if there is no | |
| 63 register pressure excess. Excess pressure for a register class at | |
| 64 some point means that there are more allocnos of given register | |
| 65 class living at the point than number of hard-registers of the | |
| 66 class available for the allocation. It is defined only for cover | |
| 67 classes. */ | |
| 68 static int high_pressure_start_point[N_REG_CLASSES]; | |
| 69 | |
| 70 /* Allocnos live at current point in the scan. */ | |
| 71 static sparseset allocnos_live; | |
| 72 | |
| 73 /* Set of hard regs (except eliminable ones) currently live. */ | |
| 74 static HARD_REG_SET hard_regs_live; | |
| 75 | |
| 76 /* The loop tree node corresponding to the current basic block. */ | |
| 77 static ira_loop_tree_node_t curr_bb_node; | |
| 78 | |
| 79 /* The number of the last processed call. */ | |
| 80 static int last_call_num; | |
| 81 /* The number of last call at which given allocno was saved. */ | |
| 82 static int *allocno_saved_at_call; | |
| 83 | |
| 84 /* The function processing birth of register REGNO. It updates living | |
| 85 hard regs and conflict hard regs for living allocnos or starts a | |
| 86 new live range for the allocno corresponding to REGNO if it is | |
| 87 necessary. */ | |
| 88 static void | |
| 89 make_regno_born (int regno) | |
| 90 { | |
| 91 unsigned int i; | |
| 92 ira_allocno_t a; | |
| 93 allocno_live_range_t p; | |
| 94 | |
| 95 if (regno < FIRST_PSEUDO_REGISTER) | |
| 96 { | |
| 97 SET_HARD_REG_BIT (hard_regs_live, regno); | |
| 98 EXECUTE_IF_SET_IN_SPARSESET (allocnos_live, i) | |
| 99 { | |
| 100 SET_HARD_REG_BIT (ALLOCNO_CONFLICT_HARD_REGS (ira_allocnos[i]), | |
| 101 regno); | |
| 102 SET_HARD_REG_BIT (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (ira_allocnos[i]), | |
| 103 regno); | |
| 104 } | |
| 105 return; | |
| 106 } | |
| 107 a = ira_curr_regno_allocno_map[regno]; | |
| 108 if (a == NULL) | |
| 109 return; | |
| 110 if ((p = ALLOCNO_LIVE_RANGES (a)) == NULL | |
| 111 || (p->finish != curr_point && p->finish + 1 != curr_point)) | |
| 112 ALLOCNO_LIVE_RANGES (a) | |
| 113 = ira_create_allocno_live_range (a, curr_point, -1, | |
| 114 ALLOCNO_LIVE_RANGES (a)); | |
| 115 } | |
| 116 | |
| 117 /* Update ALLOCNO_EXCESS_PRESSURE_POINTS_NUM for allocno A. */ | |
| 118 static void | |
| 119 update_allocno_pressure_excess_length (ira_allocno_t a) | |
| 120 { | |
| 121 int start, i; | |
| 122 enum reg_class cover_class, cl; | |
| 123 allocno_live_range_t p; | |
| 124 | |
| 125 cover_class = ALLOCNO_COVER_CLASS (a); | |
| 126 for (i = 0; | |
| 127 (cl = ira_reg_class_super_classes[cover_class][i]) != LIM_REG_CLASSES; | |
| 128 i++) | |
| 129 { | |
| 130 if (high_pressure_start_point[cl] < 0) | |
| 131 continue; | |
| 132 p = ALLOCNO_LIVE_RANGES (a); | |
| 133 ira_assert (p != NULL); | |
| 134 start = (high_pressure_start_point[cl] > p->start | |
| 135 ? high_pressure_start_point[cl] : p->start); | |
| 136 ALLOCNO_EXCESS_PRESSURE_POINTS_NUM (a) += curr_point - start + 1; | |
| 137 } | |
| 138 } | |
| 139 | |
| 140 /* Process the death of register REGNO. This updates hard_regs_live | |
| 141 or finishes the current live range for the allocno corresponding to | |
| 142 REGNO. */ | |
| 143 static void | |
| 144 make_regno_dead (int regno) | |
| 145 { | |
| 146 ira_allocno_t a; | |
| 147 allocno_live_range_t p; | |
| 148 | |
| 149 if (regno < FIRST_PSEUDO_REGISTER) | |
| 150 { | |
| 151 CLEAR_HARD_REG_BIT (hard_regs_live, regno); | |
| 152 return; | |
| 153 } | |
| 154 a = ira_curr_regno_allocno_map[regno]; | |
| 155 if (a == NULL) | |
| 156 return; | |
| 157 p = ALLOCNO_LIVE_RANGES (a); | |
| 158 ira_assert (p != NULL); | |
| 159 p->finish = curr_point; | |
| 160 update_allocno_pressure_excess_length (a); | |
| 161 } | |
| 162 | |
| 163 /* The current register pressures for each cover class for the current | |
| 164 basic block. */ | |
| 165 static int curr_reg_pressure[N_REG_CLASSES]; | |
| 166 | |
| 167 /* Mark allocno A as currently living and update current register | |
| 168 pressure, maximal register pressure for the current BB, start point | |
| 169 of the register pressure excess, and conflicting hard registers of | |
| 170 A. */ | |
| 171 static void | |
| 172 set_allocno_live (ira_allocno_t a) | |
| 173 { | |
| 174 int i; | |
| 175 enum reg_class cover_class, cl; | |
| 176 | |
| 177 /* Invalidate because it is referenced. */ | |
| 178 allocno_saved_at_call[ALLOCNO_NUM (a)] = 0; | |
| 179 if (sparseset_bit_p (allocnos_live, ALLOCNO_NUM (a))) | |
| 180 return; | |
| 181 sparseset_set_bit (allocnos_live, ALLOCNO_NUM (a)); | |
| 182 IOR_HARD_REG_SET (ALLOCNO_CONFLICT_HARD_REGS (a), hard_regs_live); | |
| 183 IOR_HARD_REG_SET (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a), hard_regs_live); | |
| 184 cover_class = ALLOCNO_COVER_CLASS (a); | |
| 185 for (i = 0; | |
| 186 (cl = ira_reg_class_super_classes[cover_class][i]) != LIM_REG_CLASSES; | |
| 187 i++) | |
| 188 { | |
| 189 curr_reg_pressure[cl] += ira_reg_class_nregs[cl][ALLOCNO_MODE (a)]; | |
| 190 if (high_pressure_start_point[cl] < 0 | |
| 191 && (curr_reg_pressure[cl] > ira_available_class_regs[cl])) | |
| 192 high_pressure_start_point[cl] = curr_point; | |
| 193 if (curr_bb_node->reg_pressure[cl] < curr_reg_pressure[cl]) | |
| 194 curr_bb_node->reg_pressure[cl] = curr_reg_pressure[cl]; | |
| 195 } | |
| 196 } | |
| 197 | |
| 198 /* Mark allocno A as currently not living and update current register | |
| 199 pressure, start point of the register pressure excess, and register | |
| 200 pressure excess length for living allocnos. */ | |
| 201 static void | |
| 202 clear_allocno_live (ira_allocno_t a) | |
| 203 { | |
| 204 int i; | |
| 205 unsigned int j; | |
| 206 enum reg_class cover_class, cl; | |
| 207 bool set_p; | |
| 208 | |
| 209 /* Invalidate because it is referenced. */ | |
| 210 allocno_saved_at_call[ALLOCNO_NUM (a)] = 0; | |
| 211 if (sparseset_bit_p (allocnos_live, ALLOCNO_NUM (a))) | |
| 212 { | |
| 213 cover_class = ALLOCNO_COVER_CLASS (a); | |
| 214 set_p = false; | |
| 215 for (i = 0; | |
| 216 (cl = ira_reg_class_super_classes[cover_class][i]) | |
| 217 != LIM_REG_CLASSES; | |
| 218 i++) | |
| 219 { | |
| 220 curr_reg_pressure[cl] -= ira_reg_class_nregs[cl][ALLOCNO_MODE (a)]; | |
| 221 ira_assert (curr_reg_pressure[cl] >= 0); | |
| 222 if (high_pressure_start_point[cl] >= 0 | |
| 223 && curr_reg_pressure[cl] <= ira_available_class_regs[cl]) | |
| 224 set_p = true; | |
| 225 } | |
| 226 if (set_p) | |
| 227 { | |
| 228 EXECUTE_IF_SET_IN_SPARSESET (allocnos_live, j) | |
| 229 update_allocno_pressure_excess_length (ira_allocnos[j]); | |
| 230 for (i = 0; | |
| 231 (cl = ira_reg_class_super_classes[cover_class][i]) | |
| 232 != LIM_REG_CLASSES; | |
| 233 i++) | |
| 234 if (high_pressure_start_point[cl] >= 0 | |
| 235 && curr_reg_pressure[cl] <= ira_available_class_regs[cl]) | |
| 236 high_pressure_start_point[cl] = -1; | |
| 237 | |
| 238 } | |
| 239 } | |
| 240 sparseset_clear_bit (allocnos_live, ALLOCNO_NUM (a)); | |
| 241 } | |
| 242 | |
| 243 /* Mark the register REG as live. Store a 1 in hard_regs_live or | |
| 244 allocnos_live for this register or the corresponding allocno, | |
| 245 record how many consecutive hardware registers it actually | |
| 246 needs. */ | |
| 247 static void | |
| 248 mark_reg_live (rtx reg) | |
| 249 { | |
| 250 int i, regno; | |
| 251 | |
| 252 gcc_assert (REG_P (reg)); | |
| 253 regno = REGNO (reg); | |
| 254 | |
| 255 if (regno >= FIRST_PSEUDO_REGISTER) | |
| 256 { | |
| 257 ira_allocno_t a = ira_curr_regno_allocno_map[regno]; | |
| 258 | |
| 259 if (a != NULL) | |
| 260 { | |
| 261 if (sparseset_bit_p (allocnos_live, ALLOCNO_NUM (a))) | |
| 262 { | |
| 263 /* Invalidate because it is referenced. */ | |
| 264 allocno_saved_at_call[ALLOCNO_NUM (a)] = 0; | |
| 265 return; | |
| 266 } | |
| 267 set_allocno_live (a); | |
| 268 } | |
| 269 make_regno_born (regno); | |
| 270 } | |
| 271 else if (! TEST_HARD_REG_BIT (ira_no_alloc_regs, regno)) | |
| 272 { | |
| 273 int last = regno + hard_regno_nregs[regno][GET_MODE (reg)]; | |
| 274 enum reg_class cover_class, cl; | |
| 275 | |
| 276 while (regno < last) | |
| 277 { | |
| 278 if (! TEST_HARD_REG_BIT (hard_regs_live, regno) | |
| 279 && ! TEST_HARD_REG_BIT (eliminable_regset, regno)) | |
| 280 { | |
| 281 cover_class = ira_hard_regno_cover_class[regno]; | |
| 282 for (i = 0; | |
| 283 (cl = ira_reg_class_super_classes[cover_class][i]) | |
| 284 != LIM_REG_CLASSES; | |
| 285 i++) | |
| 286 { | |
| 287 curr_reg_pressure[cl]++; | |
| 288 if (high_pressure_start_point[cl] < 0 | |
| 289 && (curr_reg_pressure[cl] | |
| 290 > ira_available_class_regs[cl])) | |
| 291 high_pressure_start_point[cl] = curr_point; | |
| 292 } | |
| 293 make_regno_born (regno); | |
| 294 for (i = 0; | |
| 295 (cl = ira_reg_class_super_classes[cover_class][i]) | |
| 296 != LIM_REG_CLASSES; | |
| 297 i++) | |
| 298 { | |
| 299 if (curr_bb_node->reg_pressure[cl] < curr_reg_pressure[cl]) | |
| 300 curr_bb_node->reg_pressure[cl] = curr_reg_pressure[cl]; | |
| 301 } | |
| 302 } | |
| 303 regno++; | |
| 304 } | |
| 305 } | |
| 306 } | |
| 307 | |
| 308 /* Mark the register referenced by use or def REF as live. */ | |
| 309 static void | |
| 310 mark_ref_live (df_ref ref) | |
| 311 { | |
| 312 rtx reg; | |
| 313 | |
| 314 reg = DF_REF_REG (ref); | |
| 315 if (GET_CODE (reg) == SUBREG) | |
| 316 reg = SUBREG_REG (reg); | |
| 317 mark_reg_live (reg); | |
| 318 } | |
| 319 | |
| 320 /* Mark the register REG as dead. Store a 0 in hard_regs_live or | |
| 321 allocnos_live for the register. */ | |
| 322 static void | |
| 323 mark_reg_dead (rtx reg) | |
| 324 { | |
| 325 int regno; | |
| 326 | |
| 327 gcc_assert (REG_P (reg)); | |
| 328 regno = REGNO (reg); | |
| 329 | |
| 330 if (regno >= FIRST_PSEUDO_REGISTER) | |
| 331 { | |
| 332 ira_allocno_t a = ira_curr_regno_allocno_map[regno]; | |
| 333 | |
| 334 if (a != NULL) | |
| 335 { | |
| 336 if (! sparseset_bit_p (allocnos_live, ALLOCNO_NUM (a))) | |
| 337 { | |
| 338 /* Invalidate because it is referenced. */ | |
| 339 allocno_saved_at_call[ALLOCNO_NUM (a)] = 0; | |
| 340 return; | |
| 341 } | |
| 342 clear_allocno_live (a); | |
| 343 } | |
| 344 make_regno_dead (regno); | |
| 345 } | |
| 346 else if (! TEST_HARD_REG_BIT (ira_no_alloc_regs, regno)) | |
| 347 { | |
| 348 int i; | |
| 349 unsigned int j; | |
| 350 int last = regno + hard_regno_nregs[regno][GET_MODE (reg)]; | |
| 351 enum reg_class cover_class, cl; | |
| 352 bool set_p; | |
| 353 | |
| 354 while (regno < last) | |
| 355 { | |
| 356 if (TEST_HARD_REG_BIT (hard_regs_live, regno)) | |
| 357 { | |
| 358 set_p = false; | |
| 359 cover_class = ira_hard_regno_cover_class[regno]; | |
| 360 for (i = 0; | |
| 361 (cl = ira_reg_class_super_classes[cover_class][i]) | |
| 362 != LIM_REG_CLASSES; | |
| 363 i++) | |
| 364 { | |
| 365 curr_reg_pressure[cl]--; | |
| 366 if (high_pressure_start_point[cl] >= 0 | |
| 367 && curr_reg_pressure[cl] <= ira_available_class_regs[cl]) | |
| 368 set_p = true; | |
| 369 ira_assert (curr_reg_pressure[cl] >= 0); | |
| 370 } | |
| 371 if (set_p) | |
| 372 { | |
| 373 EXECUTE_IF_SET_IN_SPARSESET (allocnos_live, j) | |
| 374 update_allocno_pressure_excess_length (ira_allocnos[j]); | |
| 375 for (i = 0; | |
| 376 (cl = ira_reg_class_super_classes[cover_class][i]) | |
| 377 != LIM_REG_CLASSES; | |
| 378 i++) | |
| 379 if (high_pressure_start_point[cl] >= 0 | |
| 380 && (curr_reg_pressure[cl] | |
| 381 <= ira_available_class_regs[cl])) | |
| 382 high_pressure_start_point[cl] = -1; | |
| 383 } | |
| 384 make_regno_dead (regno); | |
| 385 } | |
| 386 regno++; | |
| 387 } | |
| 388 } | |
| 389 } | |
| 390 | |
| 391 /* Mark the register referenced by definition DEF as dead, if the | |
| 392 definition is a total one. */ | |
| 393 static void | |
| 394 mark_ref_dead (df_ref def) | |
| 395 { | |
| 396 rtx reg; | |
| 397 | |
| 398 if (DF_REF_FLAGS_IS_SET (def, DF_REF_PARTIAL) | |
| 399 || DF_REF_FLAGS_IS_SET (def, DF_REF_CONDITIONAL)) | |
| 400 return; | |
| 401 | |
| 402 reg = DF_REF_REG (def); | |
| 403 if (GET_CODE (reg) == SUBREG) | |
| 404 reg = SUBREG_REG (reg); | |
| 405 mark_reg_dead (reg); | |
| 406 } | |
| 407 | |
| 408 /* Make pseudo REG conflicting with pseudo DREG, if the 1st pseudo | |
| 409 class is intersected with class CL. Advance the current program | |
| 410 point before making the conflict if ADVANCE_P. Return TRUE if we | |
| 411 will need to advance the current program point. */ | |
| 412 static bool | |
| 413 make_pseudo_conflict (rtx reg, enum reg_class cl, rtx dreg, bool advance_p) | |
| 414 { | |
| 415 ira_allocno_t a; | |
| 416 | |
| 417 if (GET_CODE (reg) == SUBREG) | |
| 418 reg = SUBREG_REG (reg); | |
| 419 | |
| 420 if (! REG_P (reg) || REGNO (reg) < FIRST_PSEUDO_REGISTER) | |
| 421 return advance_p; | |
| 422 | |
| 423 a = ira_curr_regno_allocno_map[REGNO (reg)]; | |
| 424 if (! reg_classes_intersect_p (cl, ALLOCNO_COVER_CLASS (a))) | |
| 425 return advance_p; | |
| 426 | |
| 427 if (advance_p) | |
| 428 curr_point++; | |
| 429 | |
| 430 mark_reg_live (reg); | |
| 431 mark_reg_live (dreg); | |
| 432 mark_reg_dead (reg); | |
| 433 mark_reg_dead (dreg); | |
| 434 | |
| 435 return false; | |
| 436 } | |
| 437 | |
| 438 /* Check and make if necessary conflicts for pseudo DREG of class | |
| 439 DEF_CL of the current insn with input operand USE of class USE_CL. | |
| 440 Advance the current program point before making the conflict if | |
| 441 ADVANCE_P. Return TRUE if we will need to advance the current | |
| 442 program point. */ | |
| 443 static bool | |
| 444 check_and_make_def_use_conflict (rtx dreg, enum reg_class def_cl, | |
| 445 int use, enum reg_class use_cl, | |
| 446 bool advance_p) | |
| 447 { | |
| 448 if (! reg_classes_intersect_p (def_cl, use_cl)) | |
| 449 return advance_p; | |
| 450 | |
| 451 advance_p = make_pseudo_conflict (recog_data.operand[use], | |
| 452 use_cl, dreg, advance_p); | |
| 453 /* Reload may end up swapping commutative operands, so you | |
| 454 have to take both orderings into account. The | |
| 455 constraints for the two operands can be completely | |
| 456 different. (Indeed, if the constraints for the two | |
| 457 operands are the same for all alternatives, there's no | |
| 458 point marking them as commutative.) */ | |
| 459 if (use < recog_data.n_operands + 1 | |
| 460 && recog_data.constraints[use][0] == '%') | |
| 461 advance_p | |
| 462 = make_pseudo_conflict (recog_data.operand[use + 1], | |
| 463 use_cl, dreg, advance_p); | |
| 464 if (use >= 1 | |
| 465 && recog_data.constraints[use - 1][0] == '%') | |
| 466 advance_p | |
| 467 = make_pseudo_conflict (recog_data.operand[use - 1], | |
| 468 use_cl, dreg, advance_p); | |
| 469 return advance_p; | |
| 470 } | |
| 471 | |
| 472 /* Check and make if necessary conflicts for definition DEF of class | |
| 473 DEF_CL of the current insn with input operands. Process only | |
| 474 constraints of alternative ALT. */ | |
| 475 static void | |
| 476 check_and_make_def_conflict (int alt, int def, enum reg_class def_cl) | |
| 477 { | |
| 478 int use, use_match; | |
| 479 ira_allocno_t a; | |
| 480 enum reg_class use_cl, acl; | |
| 481 bool advance_p; | |
| 482 rtx dreg = recog_data.operand[def]; | |
| 483 | |
| 484 if (def_cl == NO_REGS) | |
| 485 return; | |
| 486 | |
| 487 if (GET_CODE (dreg) == SUBREG) | |
| 488 dreg = SUBREG_REG (dreg); | |
| 489 | |
| 490 if (! REG_P (dreg) || REGNO (dreg) < FIRST_PSEUDO_REGISTER) | |
| 491 return; | |
| 492 | |
| 493 a = ira_curr_regno_allocno_map[REGNO (dreg)]; | |
| 494 acl = ALLOCNO_COVER_CLASS (a); | |
| 495 if (! reg_classes_intersect_p (acl, def_cl)) | |
| 496 return; | |
| 497 | |
| 498 advance_p = true; | |
| 499 | |
| 500 for (use = 0; use < recog_data.n_operands; use++) | |
| 501 { | |
| 502 if (use == def || recog_data.operand_type[use] == OP_OUT) | |
| 36 | 503 continue; |
| 0 | 504 |
| 505 if (recog_op_alt[use][alt].anything_ok) | |
| 506 use_cl = ALL_REGS; | |
| 507 else | |
| 508 use_cl = recog_op_alt[use][alt].cl; | |
| 509 | |
| 510 advance_p = check_and_make_def_use_conflict (dreg, def_cl, use, | |
| 511 use_cl, advance_p); | |
| 512 | |
| 513 if ((use_match = recog_op_alt[use][alt].matches) >= 0) | |
| 514 { | |
| 515 if (use_match == def) | |
| 36 | 516 continue; |
| 0 | 517 |
| 518 if (recog_op_alt[use_match][alt].anything_ok) | |
| 519 use_cl = ALL_REGS; | |
| 520 else | |
| 521 use_cl = recog_op_alt[use_match][alt].cl; | |
| 522 advance_p = check_and_make_def_use_conflict (dreg, def_cl, use, | |
| 523 use_cl, advance_p); | |
| 524 } | |
| 525 } | |
| 526 } | |
| 527 | |
| 528 /* Make conflicts of early clobber pseudo registers of the current | |
| 529 insn with its inputs. Avoid introducing unnecessary conflicts by | |
| 530 checking classes of the constraints and pseudos because otherwise | |
| 531 significant code degradation is possible for some targets. */ | |
| 532 static void | |
| 533 make_early_clobber_and_input_conflicts (void) | |
| 534 { | |
| 535 int alt; | |
| 536 int def, def_match; | |
| 537 enum reg_class def_cl; | |
| 538 | |
| 539 for (alt = 0; alt < recog_data.n_alternatives; alt++) | |
| 540 for (def = 0; def < recog_data.n_operands; def++) | |
| 541 { | |
| 542 def_cl = NO_REGS; | |
| 543 if (recog_op_alt[def][alt].earlyclobber) | |
| 544 { | |
| 545 if (recog_op_alt[def][alt].anything_ok) | |
| 546 def_cl = ALL_REGS; | |
| 547 else | |
| 548 def_cl = recog_op_alt[def][alt].cl; | |
| 549 check_and_make_def_conflict (alt, def, def_cl); | |
| 550 } | |
| 551 if ((def_match = recog_op_alt[def][alt].matches) >= 0 | |
| 552 && (recog_op_alt[def_match][alt].earlyclobber | |
| 553 || recog_op_alt[def][alt].earlyclobber)) | |
| 554 { | |
| 555 if (recog_op_alt[def_match][alt].anything_ok) | |
| 556 def_cl = ALL_REGS; | |
| 557 else | |
| 558 def_cl = recog_op_alt[def_match][alt].cl; | |
| 559 check_and_make_def_conflict (alt, def, def_cl); | |
| 560 } | |
| 561 } | |
| 562 } | |
| 563 | |
| 564 /* Mark early clobber hard registers of the current INSN as live (if | |
| 565 LIVE_P) or dead. Return true if there are such registers. */ | |
| 566 static bool | |
| 567 mark_hard_reg_early_clobbers (rtx insn, bool live_p) | |
| 568 { | |
| 569 df_ref *def_rec; | |
| 570 bool set_p = false; | |
| 571 | |
| 572 for (def_rec = DF_INSN_DEFS (insn); *def_rec; def_rec++) | |
| 573 if (DF_REF_FLAGS_IS_SET (*def_rec, DF_REF_MUST_CLOBBER)) | |
| 574 { | |
| 575 rtx dreg = DF_REF_REG (*def_rec); | |
| 576 | |
| 577 if (GET_CODE (dreg) == SUBREG) | |
| 578 dreg = SUBREG_REG (dreg); | |
| 579 if (! REG_P (dreg) || REGNO (dreg) >= FIRST_PSEUDO_REGISTER) | |
| 580 continue; | |
| 581 | |
| 582 /* Hard register clobbers are believed to be early clobber | |
| 583 because there is no way to say that non-operand hard | |
| 584 register clobbers are not early ones. */ | |
| 585 if (live_p) | |
| 586 mark_ref_live (*def_rec); | |
| 587 else | |
| 588 mark_ref_dead (*def_rec); | |
| 589 set_p = true; | |
| 590 } | |
| 591 | |
| 592 return set_p; | |
| 593 } | |
| 594 | |
| 595 /* Checks that CONSTRAINTS permits to use only one hard register. If | |
| 596 it is so, the function returns the class of the hard register. | |
| 597 Otherwise it returns NO_REGS. */ | |
| 598 static enum reg_class | |
| 599 single_reg_class (const char *constraints, rtx op, rtx equiv_const) | |
| 600 { | |
| 601 int ignore_p; | |
| 602 enum reg_class cl, next_cl; | |
| 603 int c; | |
| 604 | |
| 605 cl = NO_REGS; | |
| 606 for (ignore_p = false; | |
| 607 (c = *constraints); | |
| 608 constraints += CONSTRAINT_LEN (c, constraints)) | |
| 609 if (c == '#') | |
| 610 ignore_p = true; | |
| 611 else if (c == ',') | |
| 612 ignore_p = false; | |
| 613 else if (! ignore_p) | |
| 614 switch (c) | |
| 615 { | |
| 616 case ' ': | |
| 617 case '\t': | |
| 618 case '=': | |
| 619 case '+': | |
| 620 case '*': | |
| 621 case '&': | |
| 622 case '%': | |
| 623 case '!': | |
| 624 case '?': | |
| 625 break; | |
| 626 case 'i': | |
| 627 if (CONSTANT_P (op) | |
| 628 || (equiv_const != NULL_RTX && CONSTANT_P (equiv_const))) | |
| 629 return NO_REGS; | |
| 630 break; | |
| 631 | |
| 632 case 'n': | |
| 633 if (GET_CODE (op) == CONST_INT | |
| 634 || (GET_CODE (op) == CONST_DOUBLE && GET_MODE (op) == VOIDmode) | |
| 635 || (equiv_const != NULL_RTX | |
| 636 && (GET_CODE (equiv_const) == CONST_INT | |
| 637 || (GET_CODE (equiv_const) == CONST_DOUBLE | |
| 638 && GET_MODE (equiv_const) == VOIDmode)))) | |
| 639 return NO_REGS; | |
| 640 break; | |
| 641 | |
| 642 case 's': | |
| 643 if ((CONSTANT_P (op) && GET_CODE (op) != CONST_INT | |
| 644 && (GET_CODE (op) != CONST_DOUBLE || GET_MODE (op) != VOIDmode)) | |
| 645 || (equiv_const != NULL_RTX | |
| 646 && CONSTANT_P (equiv_const) | |
| 647 && GET_CODE (equiv_const) != CONST_INT | |
| 648 && (GET_CODE (equiv_const) != CONST_DOUBLE | |
| 649 || GET_MODE (equiv_const) != VOIDmode))) | |
| 650 return NO_REGS; | |
| 651 break; | |
| 652 | |
| 653 case 'I': | |
| 654 case 'J': | |
| 655 case 'K': | |
| 656 case 'L': | |
| 657 case 'M': | |
| 658 case 'N': | |
| 659 case 'O': | |
| 660 case 'P': | |
| 661 if ((GET_CODE (op) == CONST_INT | |
| 662 && CONST_OK_FOR_CONSTRAINT_P (INTVAL (op), c, constraints)) | |
| 663 || (equiv_const != NULL_RTX | |
| 664 && GET_CODE (equiv_const) == CONST_INT | |
| 665 && CONST_OK_FOR_CONSTRAINT_P (INTVAL (equiv_const), | |
| 666 c, constraints))) | |
| 667 return NO_REGS; | |
| 668 break; | |
| 669 | |
| 670 case 'E': | |
| 671 case 'F': | |
| 672 if (GET_CODE (op) == CONST_DOUBLE | |
| 673 || (GET_CODE (op) == CONST_VECTOR | |
| 674 && GET_MODE_CLASS (GET_MODE (op)) == MODE_VECTOR_FLOAT) | |
| 675 || (equiv_const != NULL_RTX | |
| 676 && (GET_CODE (equiv_const) == CONST_DOUBLE | |
| 677 || (GET_CODE (equiv_const) == CONST_VECTOR | |
| 678 && (GET_MODE_CLASS (GET_MODE (equiv_const)) | |
| 679 == MODE_VECTOR_FLOAT))))) | |
| 680 return NO_REGS; | |
| 681 break; | |
| 682 | |
| 683 case 'G': | |
| 684 case 'H': | |
| 685 if ((GET_CODE (op) == CONST_DOUBLE | |
| 686 && CONST_DOUBLE_OK_FOR_CONSTRAINT_P (op, c, constraints)) | |
| 687 || (equiv_const != NULL_RTX | |
| 688 && GET_CODE (equiv_const) == CONST_DOUBLE | |
| 689 && CONST_DOUBLE_OK_FOR_CONSTRAINT_P (equiv_const, | |
| 690 c, constraints))) | |
| 691 return NO_REGS; | |
| 692 /* ??? what about memory */ | |
| 693 case 'r': | |
| 694 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': | |
| 695 case 'h': case 'j': case 'k': case 'l': | |
| 696 case 'q': case 't': case 'u': | |
| 697 case 'v': case 'w': case 'x': case 'y': case 'z': | |
| 698 case 'A': case 'B': case 'C': case 'D': | |
| 699 case 'Q': case 'R': case 'S': case 'T': case 'U': | |
| 700 case 'W': case 'Y': case 'Z': | |
| 701 next_cl = (c == 'r' | |
| 702 ? GENERAL_REGS | |
| 703 : REG_CLASS_FROM_CONSTRAINT (c, constraints)); | |
| 704 if ((cl != NO_REGS && next_cl != cl) | |
| 705 || ira_available_class_regs[next_cl] > 1) | |
| 706 return NO_REGS; | |
| 707 cl = next_cl; | |
| 708 break; | |
| 709 | |
| 710 case '0': case '1': case '2': case '3': case '4': | |
| 711 case '5': case '6': case '7': case '8': case '9': | |
| 712 next_cl | |
| 713 = single_reg_class (recog_data.constraints[c - '0'], | |
| 714 recog_data.operand[c - '0'], NULL_RTX); | |
| 715 if ((cl != NO_REGS && next_cl != cl) || next_cl == NO_REGS | |
| 716 || ira_available_class_regs[next_cl] > 1) | |
| 717 return NO_REGS; | |
| 718 cl = next_cl; | |
| 719 break; | |
| 720 | |
| 721 default: | |
| 722 return NO_REGS; | |
| 723 } | |
| 724 return cl; | |
| 725 } | |
| 726 | |
| 727 /* The function checks that operand OP_NUM of the current insn can use | |
| 728 only one hard register. If it is so, the function returns the | |
| 729 class of the hard register. Otherwise it returns NO_REGS. */ | |
| 730 static enum reg_class | |
| 731 single_reg_operand_class (int op_num) | |
| 732 { | |
| 733 if (op_num < 0 || recog_data.n_alternatives == 0) | |
| 734 return NO_REGS; | |
| 735 return single_reg_class (recog_data.constraints[op_num], | |
| 736 recog_data.operand[op_num], NULL_RTX); | |
| 737 } | |
| 738 | |
| 739 /* Processes input operands, if IN_P, or output operands otherwise of | |
| 740 the current insn with FREQ to find allocno which can use only one | |
| 741 hard register and makes other currently living allocnos conflicting | |
| 742 with the hard register. */ | |
| 743 static void | |
| 744 process_single_reg_class_operands (bool in_p, int freq) | |
| 745 { | |
| 746 int i, regno, cost; | |
| 747 unsigned int px; | |
| 748 enum reg_class cl, cover_class; | |
| 749 rtx operand; | |
| 750 ira_allocno_t operand_a, a; | |
| 751 | |
| 752 for (i = 0; i < recog_data.n_operands; i++) | |
| 753 { | |
| 754 operand = recog_data.operand[i]; | |
| 755 if (in_p && recog_data.operand_type[i] != OP_IN | |
| 756 && recog_data.operand_type[i] != OP_INOUT) | |
| 757 continue; | |
| 758 if (! in_p && recog_data.operand_type[i] != OP_OUT | |
| 759 && recog_data.operand_type[i] != OP_INOUT) | |
| 760 continue; | |
| 761 cl = single_reg_operand_class (i); | |
| 762 if (cl == NO_REGS) | |
| 763 continue; | |
| 764 | |
| 765 operand_a = NULL; | |
| 766 | |
| 767 if (GET_CODE (operand) == SUBREG) | |
| 768 operand = SUBREG_REG (operand); | |
| 769 | |
| 770 if (REG_P (operand) | |
| 771 && (regno = REGNO (operand)) >= FIRST_PSEUDO_REGISTER) | |
| 772 { | |
| 773 enum machine_mode mode; | |
| 774 enum reg_class cover_class; | |
| 775 | |
| 776 operand_a = ira_curr_regno_allocno_map[regno]; | |
| 777 mode = ALLOCNO_MODE (operand_a); | |
| 778 cover_class = ALLOCNO_COVER_CLASS (operand_a); | |
| 779 if (ira_class_subset_p[cl][cover_class] | |
| 780 && ira_class_hard_regs_num[cl] != 0 | |
| 781 && (ira_class_hard_reg_index[cover_class] | |
| 782 [ira_class_hard_regs[cl][0]]) >= 0 | |
| 783 && reg_class_size[cl] <= (unsigned) CLASS_MAX_NREGS (cl, mode)) | |
| 784 { | |
|
19
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
785 cost |
|
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
786 = (freq |
|
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
787 * (in_p |
|
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
788 ? ira_get_register_move_cost (mode, cover_class, cl) |
|
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
789 : ira_get_register_move_cost (mode, cl, cover_class))); |
| 0 | 790 ira_allocate_and_set_costs |
| 791 (&ALLOCNO_CONFLICT_HARD_REG_COSTS (operand_a), cover_class, 0); | |
| 792 ALLOCNO_CONFLICT_HARD_REG_COSTS (operand_a) | |
| 793 [ira_class_hard_reg_index | |
| 794 [cover_class][ira_class_hard_regs[cl][0]]] | |
| 795 -= cost; | |
| 796 } | |
| 797 } | |
| 798 | |
| 799 EXECUTE_IF_SET_IN_SPARSESET (allocnos_live, px) | |
| 800 { | |
| 801 a = ira_allocnos[px]; | |
| 802 cover_class = ALLOCNO_COVER_CLASS (a); | |
| 803 if (a != operand_a) | |
| 804 { | |
| 805 /* We could increase costs of A instead of making it | |
| 806 conflicting with the hard register. But it works worse | |
| 807 because it will be spilled in reload in anyway. */ | |
| 808 IOR_HARD_REG_SET (ALLOCNO_CONFLICT_HARD_REGS (a), | |
| 809 reg_class_contents[cl]); | |
| 810 IOR_HARD_REG_SET (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a), | |
| 811 reg_class_contents[cl]); | |
| 812 } | |
| 813 } | |
| 814 } | |
| 815 } | |
| 816 | |
| 817 /* Process insns of the basic block given by its LOOP_TREE_NODE to | |
| 818 update allocno live ranges, allocno hard register conflicts, | |
| 819 intersected calls, and register pressure info for allocnos for the | |
| 820 basic block for and regions containing the basic block. */ | |
| 821 static void | |
| 822 process_bb_node_lives (ira_loop_tree_node_t loop_tree_node) | |
| 823 { | |
| 824 int i, freq; | |
| 825 unsigned int j; | |
| 826 basic_block bb; | |
| 827 rtx insn; | |
| 828 bitmap_iterator bi; | |
| 829 bitmap reg_live_out; | |
| 830 unsigned int px; | |
| 831 bool set_p; | |
| 832 | |
| 833 bb = loop_tree_node->bb; | |
| 834 if (bb != NULL) | |
| 835 { | |
| 836 for (i = 0; i < ira_reg_class_cover_size; i++) | |
| 837 { | |
| 838 curr_reg_pressure[ira_reg_class_cover[i]] = 0; | |
| 839 high_pressure_start_point[ira_reg_class_cover[i]] = -1; | |
| 840 } | |
| 841 curr_bb_node = loop_tree_node; | |
| 842 reg_live_out = DF_LR_OUT (bb); | |
| 843 sparseset_clear (allocnos_live); | |
| 844 REG_SET_TO_HARD_REG_SET (hard_regs_live, reg_live_out); | |
| 845 AND_COMPL_HARD_REG_SET (hard_regs_live, eliminable_regset); | |
| 846 AND_COMPL_HARD_REG_SET (hard_regs_live, ira_no_alloc_regs); | |
| 847 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) | |
| 848 if (TEST_HARD_REG_BIT (hard_regs_live, i)) | |
| 849 { | |
| 850 enum reg_class cover_class, cl; | |
| 851 | |
| 852 cover_class = ira_class_translate[REGNO_REG_CLASS (i)]; | |
| 853 for (j = 0; | |
| 854 (cl = ira_reg_class_super_classes[cover_class][j]) | |
| 855 != LIM_REG_CLASSES; | |
| 856 j++) | |
| 857 { | |
| 858 curr_reg_pressure[cl]++; | |
| 859 if (curr_bb_node->reg_pressure[cl] < curr_reg_pressure[cl]) | |
| 860 curr_bb_node->reg_pressure[cl] = curr_reg_pressure[cl]; | |
| 861 ira_assert (curr_reg_pressure[cl] | |
| 862 <= ira_available_class_regs[cl]); | |
| 863 } | |
| 864 } | |
| 865 EXECUTE_IF_SET_IN_BITMAP (reg_live_out, FIRST_PSEUDO_REGISTER, j, bi) | |
| 866 { | |
| 867 ira_allocno_t a = ira_curr_regno_allocno_map[j]; | |
| 868 | |
| 869 if (a == NULL) | |
| 870 continue; | |
| 871 ira_assert (! sparseset_bit_p (allocnos_live, ALLOCNO_NUM (a))); | |
| 872 set_allocno_live (a); | |
| 873 make_regno_born (j); | |
| 874 } | |
| 875 | |
| 876 freq = REG_FREQ_FROM_BB (bb); | |
| 877 if (freq == 0) | |
| 878 freq = 1; | |
| 879 | |
| 880 /* Invalidate all allocno_saved_at_call entries. */ | |
| 881 last_call_num++; | |
| 882 | |
| 883 /* Scan the code of this basic block, noting which allocnos and | |
| 884 hard regs are born or die. | |
| 885 | |
| 886 Note that this loop treats uninitialized values as live until | |
| 887 the beginning of the block. For example, if an instruction | |
| 888 uses (reg:DI foo), and only (subreg:SI (reg:DI foo) 0) is ever | |
| 889 set, FOO will remain live until the beginning of the block. | |
| 890 Likewise if FOO is not set at all. This is unnecessarily | |
| 891 pessimistic, but it probably doesn't matter much in practice. */ | |
| 892 FOR_BB_INSNS_REVERSE (bb, insn) | |
| 893 { | |
| 894 df_ref *def_rec, *use_rec; | |
| 895 bool call_p; | |
| 896 | |
| 897 if (! INSN_P (insn)) | |
| 898 continue; | |
| 899 | |
| 900 if (internal_flag_ira_verbose > 2 && ira_dump_file != NULL) | |
| 901 fprintf (ira_dump_file, " Insn %u(l%d): point = %d\n", | |
| 902 INSN_UID (insn), loop_tree_node->parent->loop->num, | |
| 903 curr_point); | |
| 904 | |
| 905 /* Mark each defined value as live. We need to do this for | |
| 906 unused values because they still conflict with quantities | |
| 907 that are live at the time of the definition. | |
| 908 | |
| 909 Ignore DF_REF_MAY_CLOBBERs on a call instruction. Such | |
| 910 references represent the effect of the called function | |
| 911 on a call-clobbered register. Marking the register as | |
| 912 live would stop us from allocating it to a call-crossing | |
| 913 allocno. */ | |
| 914 call_p = CALL_P (insn); | |
| 915 for (def_rec = DF_INSN_DEFS (insn); *def_rec; def_rec++) | |
| 916 if (!call_p || !DF_REF_FLAGS_IS_SET (*def_rec, DF_REF_MAY_CLOBBER)) | |
| 917 mark_ref_live (*def_rec); | |
| 918 | |
| 919 /* If INSN has multiple outputs, then any value used in one | |
| 920 of the outputs conflicts with the other outputs. Model this | |
| 921 by making the used value live during the output phase. | |
| 922 | |
| 923 It is unsafe to use !single_set here since it will ignore | |
| 924 an unused output. Just because an output is unused does | |
| 925 not mean the compiler can assume the side effect will not | |
| 926 occur. Consider if ALLOCNO appears in the address of an | |
| 927 output and we reload the output. If we allocate ALLOCNO | |
| 928 to the same hard register as an unused output we could | |
| 929 set the hard register before the output reload insn. */ | |
| 930 if (GET_CODE (PATTERN (insn)) == PARALLEL && multiple_sets (insn)) | |
| 931 for (use_rec = DF_INSN_USES (insn); *use_rec; use_rec++) | |
| 932 { | |
| 933 int i; | |
| 934 rtx reg; | |
| 935 | |
| 936 reg = DF_REF_REG (*use_rec); | |
| 937 for (i = XVECLEN (PATTERN (insn), 0) - 1; i >= 0; i--) | |
| 938 { | |
| 939 rtx set; | |
| 940 | |
| 941 set = XVECEXP (PATTERN (insn), 0, i); | |
| 942 if (GET_CODE (set) == SET | |
| 943 && reg_overlap_mentioned_p (reg, SET_DEST (set))) | |
| 944 { | |
| 945 /* After the previous loop, this is a no-op if | |
| 946 REG is contained within SET_DEST (SET). */ | |
| 947 mark_ref_live (*use_rec); | |
| 948 break; | |
| 949 } | |
| 950 } | |
| 951 } | |
| 952 | |
| 953 extract_insn (insn); | |
| 954 preprocess_constraints (); | |
| 955 process_single_reg_class_operands (false, freq); | |
| 956 | |
| 957 /* See which defined values die here. */ | |
| 958 for (def_rec = DF_INSN_DEFS (insn); *def_rec; def_rec++) | |
| 959 if (!call_p || !DF_REF_FLAGS_IS_SET (*def_rec, DF_REF_MAY_CLOBBER)) | |
| 960 mark_ref_dead (*def_rec); | |
| 961 | |
| 962 if (call_p) | |
| 963 { | |
| 964 last_call_num++; | |
| 965 /* The current set of live allocnos are live across the call. */ | |
| 966 EXECUTE_IF_SET_IN_SPARSESET (allocnos_live, i) | |
| 967 { | |
| 968 ira_allocno_t a = ira_allocnos[i]; | |
| 969 | |
| 970 if (allocno_saved_at_call[i] != last_call_num) | |
| 971 /* Here we are mimicking caller-save.c behaviour | |
| 972 which does not save hard register at a call if | |
| 973 it was saved on previous call in the same basic | |
| 974 block and the hard register was not mentioned | |
| 975 between the two calls. */ | |
| 976 ALLOCNO_CALL_FREQ (a) += freq; | |
| 977 /* Mark it as saved at the next call. */ | |
| 978 allocno_saved_at_call[i] = last_call_num + 1; | |
| 979 ALLOCNO_CALLS_CROSSED_NUM (a)++; | |
| 980 /* Don't allocate allocnos that cross setjmps or any | |
| 981 call, if this function receives a nonlocal | |
| 982 goto. */ | |
| 983 if (cfun->has_nonlocal_label | |
| 984 || find_reg_note (insn, REG_SETJMP, | |
| 985 NULL_RTX) != NULL_RTX) | |
| 986 { | |
| 987 SET_HARD_REG_SET (ALLOCNO_CONFLICT_HARD_REGS (a)); | |
| 988 SET_HARD_REG_SET (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a)); | |
| 989 } | |
| 990 if (can_throw_internal (insn)) | |
| 991 { | |
| 992 IOR_HARD_REG_SET (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a), | |
| 993 call_used_reg_set); | |
| 994 IOR_HARD_REG_SET (ALLOCNO_CONFLICT_HARD_REGS (a), | |
| 995 call_used_reg_set); | |
| 996 } | |
| 997 } | |
| 998 } | |
| 999 | |
| 1000 make_early_clobber_and_input_conflicts (); | |
| 1001 | |
| 1002 curr_point++; | |
| 1003 | |
| 1004 /* Mark each used value as live. */ | |
| 1005 for (use_rec = DF_INSN_USES (insn); *use_rec; use_rec++) | |
| 1006 mark_ref_live (*use_rec); | |
| 1007 | |
| 1008 process_single_reg_class_operands (true, freq); | |
| 1009 | |
| 1010 set_p = mark_hard_reg_early_clobbers (insn, true); | |
| 1011 | |
| 1012 if (set_p) | |
| 1013 { | |
| 1014 mark_hard_reg_early_clobbers (insn, false); | |
| 1015 | |
| 1016 /* Mark each hard reg as live again. For example, a | |
| 1017 hard register can be in clobber and in an insn | |
| 1018 input. */ | |
| 1019 for (use_rec = DF_INSN_USES (insn); *use_rec; use_rec++) | |
| 1020 { | |
| 1021 rtx ureg = DF_REF_REG (*use_rec); | |
| 1022 | |
| 1023 if (GET_CODE (ureg) == SUBREG) | |
| 1024 ureg = SUBREG_REG (ureg); | |
| 1025 if (! REG_P (ureg) || REGNO (ureg) >= FIRST_PSEUDO_REGISTER) | |
| 1026 continue; | |
| 1027 | |
| 1028 mark_ref_live (*use_rec); | |
| 1029 } | |
| 1030 } | |
| 1031 | |
| 1032 curr_point++; | |
| 1033 } | |
| 1034 | |
| 1035 #ifdef EH_RETURN_DATA_REGNO | |
| 1036 if (bb_has_eh_pred (bb)) | |
| 1037 for (j = 0; ; ++j) | |
| 1038 { | |
| 1039 unsigned int regno = EH_RETURN_DATA_REGNO (j); | |
| 1040 if (regno == INVALID_REGNUM) | |
| 1041 break; | |
| 1042 make_regno_born (regno); | |
| 1043 } | |
| 1044 #endif | |
| 1045 | |
| 1046 /* Allocnos can't go in stack regs at the start of a basic block | |
| 1047 that is reached by an abnormal edge. Likewise for call | |
| 1048 clobbered regs, because caller-save, fixup_abnormal_edges and | |
| 1049 possibly the table driven EH machinery are not quite ready to | |
| 1050 handle such allocnos live across such edges. */ | |
| 1051 if (bb_has_abnormal_pred (bb)) | |
| 1052 { | |
| 1053 #ifdef STACK_REGS | |
| 1054 EXECUTE_IF_SET_IN_SPARSESET (allocnos_live, px) | |
| 1055 { | |
| 1056 ALLOCNO_NO_STACK_REG_P (ira_allocnos[px]) = true; | |
| 1057 ALLOCNO_TOTAL_NO_STACK_REG_P (ira_allocnos[px]) = true; | |
| 1058 } | |
| 1059 for (px = FIRST_STACK_REG; px <= LAST_STACK_REG; px++) | |
| 1060 make_regno_born (px); | |
| 1061 #endif | |
| 1062 /* No need to record conflicts for call clobbered regs if we | |
| 1063 have nonlocal labels around, as we don't ever try to | |
| 1064 allocate such regs in this case. */ | |
| 1065 if (!cfun->has_nonlocal_label) | |
| 1066 for (px = 0; px < FIRST_PSEUDO_REGISTER; px++) | |
| 1067 if (call_used_regs[px]) | |
| 1068 make_regno_born (px); | |
| 1069 } | |
| 1070 | |
| 1071 EXECUTE_IF_SET_IN_SPARSESET (allocnos_live, i) | |
| 1072 { | |
| 1073 make_regno_dead (ALLOCNO_REGNO (ira_allocnos[i])); | |
| 1074 } | |
| 1075 | |
| 1076 curr_point++; | |
| 1077 | |
| 1078 } | |
| 1079 /* Propagate register pressure to upper loop tree nodes: */ | |
| 1080 if (loop_tree_node != ira_loop_tree_root) | |
| 1081 for (i = 0; i < ira_reg_class_cover_size; i++) | |
| 1082 { | |
| 1083 enum reg_class cover_class; | |
| 1084 | |
| 1085 cover_class = ira_reg_class_cover[i]; | |
| 1086 if (loop_tree_node->reg_pressure[cover_class] | |
| 1087 > loop_tree_node->parent->reg_pressure[cover_class]) | |
| 1088 loop_tree_node->parent->reg_pressure[cover_class] | |
| 1089 = loop_tree_node->reg_pressure[cover_class]; | |
| 1090 } | |
| 1091 } | |
| 1092 | |
| 1093 /* Create and set up IRA_START_POINT_RANGES and | |
| 1094 IRA_FINISH_POINT_RANGES. */ | |
| 1095 static void | |
| 1096 create_start_finish_chains (void) | |
| 1097 { | |
| 1098 ira_allocno_t a; | |
| 1099 ira_allocno_iterator ai; | |
| 1100 allocno_live_range_t r; | |
| 1101 | |
| 1102 ira_start_point_ranges | |
| 1103 = (allocno_live_range_t *) ira_allocate (ira_max_point | |
| 1104 * sizeof (allocno_live_range_t)); | |
| 1105 memset (ira_start_point_ranges, 0, | |
| 1106 ira_max_point * sizeof (allocno_live_range_t)); | |
| 1107 ira_finish_point_ranges | |
| 1108 = (allocno_live_range_t *) ira_allocate (ira_max_point | |
| 1109 * sizeof (allocno_live_range_t)); | |
| 1110 memset (ira_finish_point_ranges, 0, | |
| 1111 ira_max_point * sizeof (allocno_live_range_t)); | |
| 1112 FOR_EACH_ALLOCNO (a, ai) | |
| 1113 { | |
| 1114 for (r = ALLOCNO_LIVE_RANGES (a); r != NULL; r = r->next) | |
| 1115 { | |
| 1116 r->start_next = ira_start_point_ranges[r->start]; | |
| 1117 ira_start_point_ranges[r->start] = r; | |
| 1118 r->finish_next = ira_finish_point_ranges[r->finish]; | |
| 1119 ira_finish_point_ranges[r->finish] = r; | |
| 1120 } | |
| 1121 } | |
| 1122 } | |
| 1123 | |
| 1124 /* Rebuild IRA_START_POINT_RANGES and IRA_FINISH_POINT_RANGES after | |
| 1125 new live ranges and program points were added as a result if new | |
| 1126 insn generation. */ | |
| 1127 void | |
| 1128 ira_rebuild_start_finish_chains (void) | |
| 1129 { | |
| 1130 ira_free (ira_finish_point_ranges); | |
| 1131 ira_free (ira_start_point_ranges); | |
| 1132 create_start_finish_chains (); | |
| 1133 } | |
| 1134 | |
| 1135 /* Compress allocno live ranges by removing program points where | |
| 1136 nothing happens. */ | |
| 1137 static void | |
| 1138 remove_some_program_points_and_update_live_ranges (void) | |
| 1139 { | |
| 1140 unsigned i; | |
| 1141 int n; | |
| 1142 int *map; | |
| 1143 ira_allocno_t a; | |
| 1144 ira_allocno_iterator ai; | |
| 1145 allocno_live_range_t r; | |
| 1146 bitmap born_or_died; | |
| 1147 bitmap_iterator bi; | |
| 1148 | |
| 1149 born_or_died = ira_allocate_bitmap (); | |
| 1150 FOR_EACH_ALLOCNO (a, ai) | |
| 1151 { | |
| 1152 for (r = ALLOCNO_LIVE_RANGES (a); r != NULL; r = r->next) | |
| 1153 { | |
| 1154 ira_assert (r->start <= r->finish); | |
| 1155 bitmap_set_bit (born_or_died, r->start); | |
| 1156 bitmap_set_bit (born_or_died, r->finish); | |
| 1157 } | |
| 1158 } | |
| 1159 map = (int *) ira_allocate (sizeof (int) * ira_max_point); | |
| 1160 n = 0; | |
| 1161 EXECUTE_IF_SET_IN_BITMAP(born_or_died, 0, i, bi) | |
| 1162 { | |
| 1163 map[i] = n++; | |
| 1164 } | |
| 1165 ira_free_bitmap (born_or_died); | |
| 1166 if (internal_flag_ira_verbose > 1 && ira_dump_file != NULL) | |
| 1167 fprintf (ira_dump_file, "Compressing live ranges: from %d to %d - %d%%\n", | |
| 1168 ira_max_point, n, 100 * n / ira_max_point); | |
| 1169 ira_max_point = n; | |
| 1170 FOR_EACH_ALLOCNO (a, ai) | |
| 1171 { | |
| 1172 for (r = ALLOCNO_LIVE_RANGES (a); r != NULL; r = r->next) | |
| 1173 { | |
| 1174 r->start = map[r->start]; | |
| 1175 r->finish = map[r->finish]; | |
| 1176 } | |
| 1177 } | |
| 1178 ira_free (map); | |
| 1179 } | |
| 1180 | |
| 1181 /* Print live ranges R to file F. */ | |
| 1182 void | |
| 1183 ira_print_live_range_list (FILE *f, allocno_live_range_t r) | |
| 1184 { | |
| 1185 for (; r != NULL; r = r->next) | |
| 1186 fprintf (f, " [%d..%d]", r->start, r->finish); | |
| 1187 fprintf (f, "\n"); | |
| 1188 } | |
| 1189 | |
| 1190 /* Print live ranges R to stderr. */ | |
| 1191 void | |
| 1192 ira_debug_live_range_list (allocno_live_range_t r) | |
| 1193 { | |
| 1194 ira_print_live_range_list (stderr, r); | |
| 1195 } | |
| 1196 | |
| 1197 /* Print live ranges of allocno A to file F. */ | |
| 1198 static void | |
| 1199 print_allocno_live_ranges (FILE *f, ira_allocno_t a) | |
| 1200 { | |
| 1201 fprintf (f, " a%d(r%d):", ALLOCNO_NUM (a), ALLOCNO_REGNO (a)); | |
| 1202 ira_print_live_range_list (f, ALLOCNO_LIVE_RANGES (a)); | |
| 1203 } | |
| 1204 | |
| 1205 /* Print live ranges of allocno A to stderr. */ | |
| 1206 void | |
| 1207 ira_debug_allocno_live_ranges (ira_allocno_t a) | |
| 1208 { | |
| 1209 print_allocno_live_ranges (stderr, a); | |
| 1210 } | |
| 1211 | |
| 1212 /* Print live ranges of all allocnos to file F. */ | |
| 1213 static void | |
| 1214 print_live_ranges (FILE *f) | |
| 1215 { | |
| 1216 ira_allocno_t a; | |
| 1217 ira_allocno_iterator ai; | |
| 1218 | |
| 1219 FOR_EACH_ALLOCNO (a, ai) | |
| 1220 print_allocno_live_ranges (f, a); | |
| 1221 } | |
| 1222 | |
| 1223 /* Print live ranges of all allocnos to stderr. */ | |
| 1224 void | |
| 1225 ira_debug_live_ranges (void) | |
| 1226 { | |
| 1227 print_live_ranges (stderr); | |
| 1228 } | |
| 1229 | |
| 1230 /* The main entry function creates live ranges, set up | |
| 1231 CONFLICT_HARD_REGS and TOTAL_CONFLICT_HARD_REGS for allocnos, and | |
| 1232 calculate register pressure info. */ | |
| 1233 void | |
| 1234 ira_create_allocno_live_ranges (void) | |
| 1235 { | |
| 1236 allocnos_live = sparseset_alloc (ira_allocnos_num); | |
| 1237 curr_point = 0; | |
| 1238 last_call_num = 0; | |
| 1239 allocno_saved_at_call | |
| 1240 = (int *) ira_allocate (ira_allocnos_num * sizeof (int)); | |
| 1241 memset (allocno_saved_at_call, 0, ira_allocnos_num * sizeof (int)); | |
| 1242 ira_traverse_loop_tree (true, ira_loop_tree_root, NULL, | |
| 1243 process_bb_node_lives); | |
| 1244 ira_max_point = curr_point; | |
| 1245 create_start_finish_chains (); | |
| 1246 if (internal_flag_ira_verbose > 2 && ira_dump_file != NULL) | |
| 1247 print_live_ranges (ira_dump_file); | |
| 1248 /* Clean up. */ | |
| 1249 ira_free (allocno_saved_at_call); | |
| 1250 sparseset_free (allocnos_live); | |
| 1251 } | |
| 1252 | |
| 1253 /* Compress allocno live ranges. */ | |
| 1254 void | |
| 1255 ira_compress_allocno_live_ranges (void) | |
| 1256 { | |
| 1257 remove_some_program_points_and_update_live_ranges (); | |
| 1258 ira_rebuild_start_finish_chains (); | |
| 1259 if (internal_flag_ira_verbose > 2 && ira_dump_file != NULL) | |
| 1260 { | |
| 1261 fprintf (ira_dump_file, "Ranges after the compression:\n"); | |
| 1262 print_live_ranges (ira_dump_file); | |
| 1263 } | |
| 1264 } | |
| 1265 | |
| 1266 /* Free arrays IRA_START_POINT_RANGES and IRA_FINISH_POINT_RANGES. */ | |
| 1267 void | |
| 1268 ira_finish_allocno_live_ranges (void) | |
| 1269 { | |
| 1270 ira_free (ira_finish_point_ranges); | |
| 1271 ira_free (ira_start_point_ranges); | |
| 1272 } |