Mercurial > hg > CbC > CbC_gcc
annotate gcc/ira-conflicts.c @ 63:b7f97abdc517 gcc-4.6-20100522
update gcc from gcc-4.5.0 to gcc-4.6
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 24 May 2010 12:47:05 +0900 |
| parents | 77e2b8dfacca |
| children | f6334be47118 |
| rev | line source |
|---|---|
| 0 | 1 /* IRA conflict builder. |
|
63
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|
2 Copyright (C) 2006, 2007, 2008, 2009, 2010 |
| 0 | 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 "hard-reg-set.h" | |
| 32 #include "basic-block.h" | |
| 33 #include "insn-config.h" | |
| 34 #include "recog.h" | |
| 35 #include "toplev.h" | |
| 36 #include "params.h" | |
| 37 #include "df.h" | |
| 38 #include "sparseset.h" | |
| 39 #include "ira-int.h" | |
| 40 #include "addresses.h" | |
| 41 | |
| 42 /* This file contains code responsible for allocno conflict creation, | |
| 43 allocno copy creation and allocno info accumulation on upper level | |
| 44 regions. */ | |
| 45 | |
| 46 /* ira_allocnos_num array of arrays of bits, recording whether two | |
| 47 allocno's conflict (can't go in the same hardware register). | |
| 48 | |
| 49 Some arrays will be used as conflict bit vector of the | |
| 50 corresponding allocnos see function build_allocno_conflicts. */ | |
| 51 static IRA_INT_TYPE **conflicts; | |
| 52 | |
| 53 /* Macro to test a conflict of A1 and A2 in `conflicts'. */ | |
| 54 #define CONFLICT_ALLOCNO_P(A1, A2) \ | |
| 55 (ALLOCNO_MIN (A1) <= ALLOCNO_CONFLICT_ID (A2) \ | |
| 56 && ALLOCNO_CONFLICT_ID (A2) <= ALLOCNO_MAX (A1) \ | |
| 57 && TEST_ALLOCNO_SET_BIT (conflicts[ALLOCNO_NUM (A1)], \ | |
| 58 ALLOCNO_CONFLICT_ID (A2), \ | |
| 59 ALLOCNO_MIN (A1), \ | |
| 60 ALLOCNO_MAX (A1))) | |
| 61 | |
| 62 | |
| 63 | |
| 64 /* Build allocno conflict table by processing allocno live ranges. | |
| 65 Return true if the table was built. The table is not built if it | |
| 66 is too big. */ | |
| 67 static bool | |
| 68 build_conflict_bit_table (void) | |
| 69 { | |
| 70 int i, num, id, allocated_words_num, conflict_bit_vec_words_num; | |
| 71 unsigned int j; | |
| 72 enum reg_class cover_class; | |
| 73 ira_allocno_t allocno, live_a; | |
| 74 allocno_live_range_t r; | |
| 75 ira_allocno_iterator ai; | |
| 76 sparseset allocnos_live; | |
| 77 int allocno_set_words; | |
| 78 | |
| 79 allocno_set_words = (ira_allocnos_num + IRA_INT_BITS - 1) / IRA_INT_BITS; | |
| 80 allocated_words_num = 0; | |
| 81 FOR_EACH_ALLOCNO (allocno, ai) | |
| 82 { | |
| 83 if (ALLOCNO_MAX (allocno) < ALLOCNO_MIN (allocno)) | |
| 84 continue; | |
| 85 conflict_bit_vec_words_num | |
| 86 = ((ALLOCNO_MAX (allocno) - ALLOCNO_MIN (allocno) + IRA_INT_BITS) | |
| 87 / IRA_INT_BITS); | |
| 88 allocated_words_num += conflict_bit_vec_words_num; | |
| 89 if ((unsigned long long) allocated_words_num * sizeof (IRA_INT_TYPE) | |
| 90 > (unsigned long long) IRA_MAX_CONFLICT_TABLE_SIZE * 1024 * 1024) | |
| 91 { | |
| 92 if (internal_flag_ira_verbose > 0 && ira_dump_file != NULL) | |
| 93 fprintf | |
| 94 (ira_dump_file, | |
| 95 "+++Conflict table will be too big(>%dMB) -- don't use it\n", | |
| 96 IRA_MAX_CONFLICT_TABLE_SIZE); | |
| 97 return false; | |
| 98 } | |
| 99 } | |
| 100 allocnos_live = sparseset_alloc (ira_allocnos_num); | |
| 101 conflicts = (IRA_INT_TYPE **) ira_allocate (sizeof (IRA_INT_TYPE *) | |
| 102 * ira_allocnos_num); | |
| 103 allocated_words_num = 0; | |
| 104 FOR_EACH_ALLOCNO (allocno, ai) | |
| 105 { | |
| 106 num = ALLOCNO_NUM (allocno); | |
| 107 if (ALLOCNO_MAX (allocno) < ALLOCNO_MIN (allocno)) | |
| 108 { | |
| 109 conflicts[num] = NULL; | |
| 110 continue; | |
| 111 } | |
| 112 conflict_bit_vec_words_num | |
| 113 = ((ALLOCNO_MAX (allocno) - ALLOCNO_MIN (allocno) + IRA_INT_BITS) | |
| 114 / IRA_INT_BITS); | |
| 115 allocated_words_num += conflict_bit_vec_words_num; | |
| 116 conflicts[num] | |
| 117 = (IRA_INT_TYPE *) ira_allocate (sizeof (IRA_INT_TYPE) | |
| 118 * conflict_bit_vec_words_num); | |
| 119 memset (conflicts[num], 0, | |
| 120 sizeof (IRA_INT_TYPE) * conflict_bit_vec_words_num); | |
| 121 } | |
| 122 if (internal_flag_ira_verbose > 0 && ira_dump_file != NULL) | |
| 123 fprintf | |
| 124 (ira_dump_file, | |
| 125 "+++Allocating %ld bytes for conflict table (uncompressed size %ld)\n", | |
| 126 (long) allocated_words_num * sizeof (IRA_INT_TYPE), | |
| 127 (long) allocno_set_words * ira_allocnos_num * sizeof (IRA_INT_TYPE)); | |
| 128 for (i = 0; i < ira_max_point; i++) | |
| 129 { | |
| 130 for (r = ira_start_point_ranges[i]; r != NULL; r = r->start_next) | |
| 131 { | |
| 132 allocno = r->allocno; | |
| 133 num = ALLOCNO_NUM (allocno); | |
| 134 id = ALLOCNO_CONFLICT_ID (allocno); | |
| 135 cover_class = ALLOCNO_COVER_CLASS (allocno); | |
| 136 sparseset_set_bit (allocnos_live, num); | |
| 137 EXECUTE_IF_SET_IN_SPARSESET (allocnos_live, j) | |
| 138 { | |
| 139 live_a = ira_allocnos[j]; | |
| 140 if (ira_reg_classes_intersect_p | |
| 141 [cover_class][ALLOCNO_COVER_CLASS (live_a)] | |
| 142 /* Don't set up conflict for the allocno with itself. */ | |
| 143 && num != (int) j) | |
| 144 { | |
| 145 SET_ALLOCNO_SET_BIT (conflicts[num], | |
| 146 ALLOCNO_CONFLICT_ID (live_a), | |
| 147 ALLOCNO_MIN (allocno), | |
| 148 ALLOCNO_MAX (allocno)); | |
| 149 SET_ALLOCNO_SET_BIT (conflicts[j], id, | |
| 150 ALLOCNO_MIN (live_a), | |
| 151 ALLOCNO_MAX (live_a)); | |
| 152 } | |
| 153 } | |
| 154 } | |
|
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155 |
| 0 | 156 for (r = ira_finish_point_ranges[i]; r != NULL; r = r->finish_next) |
| 157 sparseset_clear_bit (allocnos_live, ALLOCNO_NUM (r->allocno)); | |
| 158 } | |
| 159 sparseset_free (allocnos_live); | |
| 160 return true; | |
| 161 } | |
| 162 | |
| 163 | |
| 164 | |
| 165 /* Return TRUE if the operand constraint STR is commutative. */ | |
| 166 static bool | |
| 167 commutative_constraint_p (const char *str) | |
| 168 { | |
| 169 bool ignore_p; | |
| 170 int c; | |
| 171 | |
| 172 for (ignore_p = false;;) | |
| 173 { | |
| 174 c = *str; | |
| 175 if (c == '\0') | |
| 176 break; | |
| 177 str += CONSTRAINT_LEN (c, str); | |
| 178 if (c == '#') | |
| 179 ignore_p = true; | |
| 180 else if (c == ',') | |
| 181 ignore_p = false; | |
| 182 else if (! ignore_p) | |
| 183 { | |
| 184 /* Usually `%' is the first constraint character but the | |
| 185 documentation does not require this. */ | |
| 186 if (c == '%') | |
| 187 return true; | |
| 188 } | |
| 189 } | |
| 190 return false; | |
| 191 } | |
| 192 | |
| 193 /* Return the number of the operand which should be the same in any | |
| 194 case as operand with number OP_NUM (or negative value if there is | |
| 195 no such operand). If USE_COMMUT_OP_P is TRUE, the function makes | |
| 196 temporarily commutative operand exchange before this. The function | |
| 197 takes only really possible alternatives into consideration. */ | |
| 198 static int | |
| 199 get_dup_num (int op_num, bool use_commut_op_p) | |
| 200 { | |
| 201 int curr_alt, c, original, dup; | |
| 202 bool ignore_p, commut_op_used_p; | |
| 203 const char *str; | |
| 204 rtx op; | |
| 205 | |
| 206 if (op_num < 0 || recog_data.n_alternatives == 0) | |
| 207 return -1; | |
| 208 op = recog_data.operand[op_num]; | |
| 209 commut_op_used_p = true; | |
| 210 if (use_commut_op_p) | |
| 211 { | |
| 212 if (commutative_constraint_p (recog_data.constraints[op_num])) | |
| 213 op_num++; | |
| 214 else if (op_num > 0 && commutative_constraint_p (recog_data.constraints | |
| 215 [op_num - 1])) | |
| 216 op_num--; | |
| 217 else | |
| 218 commut_op_used_p = false; | |
| 219 } | |
| 220 str = recog_data.constraints[op_num]; | |
| 221 for (ignore_p = false, original = -1, curr_alt = 0;;) | |
| 222 { | |
| 223 c = *str; | |
| 224 if (c == '\0') | |
| 225 break; | |
| 226 if (c == '#') | |
| 227 ignore_p = true; | |
| 228 else if (c == ',') | |
| 229 { | |
| 230 curr_alt++; | |
| 231 ignore_p = false; | |
| 232 } | |
| 233 else if (! ignore_p) | |
| 234 switch (c) | |
| 235 { | |
| 236 case 'X': | |
| 237 return -1; | |
|
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238 |
| 0 | 239 case 'm': |
| 240 case 'o': | |
| 241 /* Accept a register which might be placed in memory. */ | |
| 242 return -1; | |
| 243 break; | |
| 244 | |
| 245 case 'V': | |
| 246 case '<': | |
| 247 case '>': | |
| 248 break; | |
| 249 | |
| 250 case 'p': | |
|
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251 if (address_operand (op, VOIDmode)) |
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252 return -1; |
| 0 | 253 break; |
|
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254 |
| 0 | 255 case 'g': |
| 256 return -1; | |
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257 |
| 0 | 258 case 'r': |
| 259 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': | |
| 260 case 'h': case 'j': case 'k': case 'l': | |
| 261 case 'q': case 't': case 'u': | |
| 262 case 'v': case 'w': case 'x': case 'y': case 'z': | |
| 263 case 'A': case 'B': case 'C': case 'D': | |
| 264 case 'Q': case 'R': case 'S': case 'T': case 'U': | |
| 265 case 'W': case 'Y': case 'Z': | |
| 266 { | |
| 267 enum reg_class cl; | |
| 268 | |
| 269 cl = (c == 'r' | |
| 270 ? GENERAL_REGS : REG_CLASS_FROM_CONSTRAINT (c, str)); | |
| 271 if (cl != NO_REGS) | |
| 272 return -1; | |
| 273 #ifdef EXTRA_CONSTRAINT_STR | |
| 274 else if (EXTRA_CONSTRAINT_STR (op, c, str)) | |
| 275 return -1; | |
| 276 #endif | |
| 277 break; | |
| 278 } | |
|
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279 |
| 0 | 280 case '0': case '1': case '2': case '3': case '4': |
| 281 case '5': case '6': case '7': case '8': case '9': | |
| 282 if (original != -1 && original != c) | |
| 283 return -1; | |
| 284 original = c; | |
| 285 break; | |
| 286 } | |
| 287 str += CONSTRAINT_LEN (c, str); | |
| 288 } | |
| 289 if (original == -1) | |
| 290 return -1; | |
| 291 dup = original - '0'; | |
| 292 if (use_commut_op_p) | |
| 293 { | |
| 294 if (commutative_constraint_p (recog_data.constraints[dup])) | |
| 295 dup++; | |
| 296 else if (dup > 0 | |
| 297 && commutative_constraint_p (recog_data.constraints[dup -1])) | |
| 298 dup--; | |
| 299 else if (! commut_op_used_p) | |
| 300 return -1; | |
| 301 } | |
| 302 return dup; | |
| 303 } | |
| 304 | |
| 305 /* Check that X is REG or SUBREG of REG. */ | |
| 306 #define REG_SUBREG_P(x) \ | |
| 307 (REG_P (x) || (GET_CODE (x) == SUBREG && REG_P (SUBREG_REG (x)))) | |
| 308 | |
| 309 /* Return X if X is a REG, otherwise it should be SUBREG of REG and | |
| 310 the function returns the reg in this case. *OFFSET will be set to | |
| 311 0 in the first case or the regno offset in the first case. */ | |
| 312 static rtx | |
| 313 go_through_subreg (rtx x, int *offset) | |
| 314 { | |
| 315 rtx reg; | |
| 316 | |
| 317 *offset = 0; | |
| 318 if (REG_P (x)) | |
| 319 return x; | |
| 320 ira_assert (GET_CODE (x) == SUBREG); | |
| 321 reg = SUBREG_REG (x); | |
| 322 ira_assert (REG_P (reg)); | |
| 323 if (REGNO (reg) < FIRST_PSEUDO_REGISTER) | |
| 324 *offset = subreg_regno_offset (REGNO (reg), GET_MODE (reg), | |
| 325 SUBREG_BYTE (x), GET_MODE (x)); | |
| 326 else | |
| 327 *offset = (SUBREG_BYTE (x) / REGMODE_NATURAL_SIZE (GET_MODE (x))); | |
| 328 return reg; | |
| 329 } | |
| 330 | |
| 331 /* Process registers REG1 and REG2 in move INSN with execution | |
| 332 frequency FREQ. The function also processes the registers in a | |
| 333 potential move insn (INSN == NULL in this case) with frequency | |
| 334 FREQ. The function can modify hard register costs of the | |
| 335 corresponding allocnos or create a copy involving the corresponding | |
| 336 allocnos. The function does nothing if the both registers are hard | |
| 337 registers. When nothing is changed, the function returns | |
| 338 FALSE. */ | |
| 339 static bool | |
| 340 process_regs_for_copy (rtx reg1, rtx reg2, bool constraint_p, | |
| 341 rtx insn, int freq) | |
| 342 { | |
| 343 int allocno_preferenced_hard_regno, cost, index, offset1, offset2; | |
| 344 bool only_regs_p; | |
| 345 ira_allocno_t a; | |
| 346 enum reg_class rclass, cover_class; | |
| 347 enum machine_mode mode; | |
| 348 ira_copy_t cp; | |
| 349 ira_loop_tree_node_t parent; | |
| 350 | |
| 351 gcc_assert (REG_SUBREG_P (reg1) && REG_SUBREG_P (reg2)); | |
| 352 only_regs_p = REG_P (reg1) && REG_P (reg2); | |
| 353 reg1 = go_through_subreg (reg1, &offset1); | |
| 354 reg2 = go_through_subreg (reg2, &offset2); | |
| 355 /* Set up hard regno preferenced by allocno. If allocno gets the | |
| 356 hard regno the copy (or potential move) insn will be removed. */ | |
| 357 if (HARD_REGISTER_P (reg1)) | |
| 358 { | |
| 359 if (HARD_REGISTER_P (reg2)) | |
| 360 return false; | |
| 361 allocno_preferenced_hard_regno = REGNO (reg1) + offset1 - offset2; | |
| 362 a = ira_curr_regno_allocno_map[REGNO (reg2)]; | |
| 363 } | |
| 364 else if (HARD_REGISTER_P (reg2)) | |
| 365 { | |
| 366 allocno_preferenced_hard_regno = REGNO (reg2) + offset2 - offset1; | |
| 367 a = ira_curr_regno_allocno_map[REGNO (reg1)]; | |
| 368 } | |
| 369 else if (!CONFLICT_ALLOCNO_P (ira_curr_regno_allocno_map[REGNO (reg1)], | |
| 370 ira_curr_regno_allocno_map[REGNO (reg2)]) | |
| 371 && offset1 == offset2) | |
| 372 { | |
| 373 cp = ira_add_allocno_copy (ira_curr_regno_allocno_map[REGNO (reg1)], | |
| 374 ira_curr_regno_allocno_map[REGNO (reg2)], | |
| 375 freq, constraint_p, insn, | |
| 376 ira_curr_loop_tree_node); | |
|
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377 bitmap_set_bit (ira_curr_loop_tree_node->local_copies, cp->num); |
| 0 | 378 return true; |
| 379 } | |
| 380 else | |
| 381 return false; | |
| 382 if (! IN_RANGE (allocno_preferenced_hard_regno, 0, FIRST_PSEUDO_REGISTER - 1)) | |
| 383 /* Can not be tied. */ | |
| 384 return false; | |
| 385 rclass = REGNO_REG_CLASS (allocno_preferenced_hard_regno); | |
| 386 mode = ALLOCNO_MODE (a); | |
| 387 cover_class = ALLOCNO_COVER_CLASS (a); | |
| 388 if (only_regs_p && insn != NULL_RTX | |
| 389 && reg_class_size[rclass] <= (unsigned) CLASS_MAX_NREGS (rclass, mode)) | |
| 390 /* It is already taken into account in ira-costs.c. */ | |
| 391 return false; | |
| 392 index = ira_class_hard_reg_index[cover_class][allocno_preferenced_hard_regno]; | |
| 393 if (index < 0) | |
| 394 /* Can not be tied. It is not in the cover class. */ | |
| 395 return false; | |
| 396 if (HARD_REGISTER_P (reg1)) | |
|
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397 cost = ira_get_register_move_cost (mode, cover_class, rclass) * freq; |
| 0 | 398 else |
|
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399 cost = ira_get_register_move_cost (mode, rclass, cover_class) * freq; |
| 0 | 400 for (;;) |
| 401 { | |
| 402 ira_allocate_and_set_costs | |
| 403 (&ALLOCNO_HARD_REG_COSTS (a), cover_class, | |
| 404 ALLOCNO_COVER_CLASS_COST (a)); | |
| 405 ira_allocate_and_set_costs | |
| 406 (&ALLOCNO_CONFLICT_HARD_REG_COSTS (a), cover_class, 0); | |
| 407 ALLOCNO_HARD_REG_COSTS (a)[index] -= cost; | |
| 408 ALLOCNO_CONFLICT_HARD_REG_COSTS (a)[index] -= cost; | |
| 409 if (ALLOCNO_HARD_REG_COSTS (a)[index] < ALLOCNO_COVER_CLASS_COST (a)) | |
| 410 ALLOCNO_COVER_CLASS_COST (a) = ALLOCNO_HARD_REG_COSTS (a)[index]; | |
| 411 if (ALLOCNO_CAP (a) != NULL) | |
| 412 a = ALLOCNO_CAP (a); | |
| 413 else if ((parent = ALLOCNO_LOOP_TREE_NODE (a)->parent) == NULL | |
| 414 || (a = parent->regno_allocno_map[ALLOCNO_REGNO (a)]) == NULL) | |
| 415 break; | |
| 416 } | |
| 417 return true; | |
| 418 } | |
| 419 | |
|
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420 /* Process all of the output registers of the current insn which are |
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421 not bound (BOUND_P) and the input register REG (its operand number |
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422 OP_NUM) which dies in the insn as if there were a move insn between |
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423 them with frequency FREQ. */ |
| 0 | 424 static void |
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425 process_reg_shuffles (rtx reg, int op_num, int freq, bool *bound_p) |
| 0 | 426 { |
| 427 int i; | |
| 428 rtx another_reg; | |
| 429 | |
| 430 gcc_assert (REG_SUBREG_P (reg)); | |
| 431 for (i = 0; i < recog_data.n_operands; i++) | |
| 432 { | |
| 433 another_reg = recog_data.operand[i]; | |
|
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434 |
| 0 | 435 if (!REG_SUBREG_P (another_reg) || op_num == i |
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436 || recog_data.operand_type[i] != OP_OUT |
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437 || bound_p[i]) |
| 0 | 438 continue; |
|
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439 |
| 0 | 440 process_regs_for_copy (reg, another_reg, false, NULL_RTX, freq); |
| 441 } | |
| 442 } | |
| 443 | |
| 444 /* Process INSN and create allocno copies if necessary. For example, | |
| 445 it might be because INSN is a pseudo-register move or INSN is two | |
| 446 operand insn. */ | |
| 447 static void | |
| 448 add_insn_allocno_copies (rtx insn) | |
| 449 { | |
| 450 rtx set, operand, dup; | |
| 451 const char *str; | |
|
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452 bool commut_p, bound_p[MAX_RECOG_OPERANDS]; |
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453 int i, j, n, freq; |
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454 |
| 0 | 455 freq = REG_FREQ_FROM_BB (BLOCK_FOR_INSN (insn)); |
| 456 if (freq == 0) | |
| 457 freq = 1; | |
| 458 if ((set = single_set (insn)) != NULL_RTX | |
| 459 && REG_SUBREG_P (SET_DEST (set)) && REG_SUBREG_P (SET_SRC (set)) | |
| 460 && ! side_effects_p (set) | |
| 461 && find_reg_note (insn, REG_DEAD, | |
| 462 REG_P (SET_SRC (set)) | |
| 463 ? SET_SRC (set) | |
| 464 : SUBREG_REG (SET_SRC (set))) != NULL_RTX) | |
|
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465 { |
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466 process_regs_for_copy (SET_DEST (set), SET_SRC (set), false, insn, freq); |
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467 return; |
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468 } |
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469 /* Fast check of possibility of constraint or shuffle copies. If |
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470 there are no dead registers, there will be no such copies. */ |
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471 if (! find_reg_note (insn, REG_DEAD, NULL_RTX)) |
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472 return; |
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473 extract_insn (insn); |
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474 for (i = 0; i < recog_data.n_operands; i++) |
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475 bound_p[i] = false; |
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476 for (i = 0; i < recog_data.n_operands; i++) |
| 0 | 477 { |
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478 operand = recog_data.operand[i]; |
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479 if (! REG_SUBREG_P (operand)) |
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480 continue; |
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481 str = recog_data.constraints[i]; |
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482 while (*str == ' ' || *str == '\t') |
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483 str++; |
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484 for (j = 0, commut_p = false; j < 2; j++, commut_p = true) |
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485 if ((n = get_dup_num (i, commut_p)) >= 0) |
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486 { |
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487 bound_p[n] = true; |
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488 dup = recog_data.operand[n]; |
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489 if (REG_SUBREG_P (dup) |
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490 && find_reg_note (insn, REG_DEAD, |
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491 REG_P (operand) |
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492 ? operand |
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493 : SUBREG_REG (operand)) != NULL_RTX) |
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494 process_regs_for_copy (operand, dup, true, NULL_RTX, freq); |
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495 } |
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496 } |
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497 for (i = 0; i < recog_data.n_operands; i++) |
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498 { |
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499 operand = recog_data.operand[i]; |
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500 if (REG_SUBREG_P (operand) |
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501 && find_reg_note (insn, REG_DEAD, |
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502 REG_P (operand) |
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503 ? operand : SUBREG_REG (operand)) != NULL_RTX) |
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504 /* If an operand dies, prefer its hard register for the output |
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505 operands by decreasing the hard register cost or creating |
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506 the corresponding allocno copies. The cost will not |
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507 correspond to a real move insn cost, so make the frequency |
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508 smaller. */ |
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509 process_reg_shuffles (operand, i, freq < 8 ? 1 : freq / 8, bound_p); |
| 0 | 510 } |
| 511 } | |
| 512 | |
| 513 /* Add copies originated from BB given by LOOP_TREE_NODE. */ | |
| 514 static void | |
| 515 add_copies (ira_loop_tree_node_t loop_tree_node) | |
| 516 { | |
| 517 basic_block bb; | |
| 518 rtx insn; | |
| 519 | |
| 520 bb = loop_tree_node->bb; | |
| 521 if (bb == NULL) | |
| 522 return; | |
| 523 FOR_BB_INSNS (bb, insn) | |
|
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524 if (NONDEBUG_INSN_P (insn)) |
| 0 | 525 add_insn_allocno_copies (insn); |
| 526 } | |
| 527 | |
| 528 /* Propagate copies the corresponding allocnos on upper loop tree | |
| 529 level. */ | |
| 530 static void | |
| 531 propagate_copies (void) | |
| 532 { | |
| 533 ira_copy_t cp; | |
| 534 ira_copy_iterator ci; | |
| 535 ira_allocno_t a1, a2, parent_a1, parent_a2; | |
| 536 ira_loop_tree_node_t parent; | |
| 537 | |
| 538 FOR_EACH_COPY (cp, ci) | |
| 539 { | |
| 540 a1 = cp->first; | |
| 541 a2 = cp->second; | |
| 542 if (ALLOCNO_LOOP_TREE_NODE (a1) == ira_loop_tree_root) | |
| 543 continue; | |
| 544 ira_assert ((ALLOCNO_LOOP_TREE_NODE (a2) != ira_loop_tree_root)); | |
| 545 parent = ALLOCNO_LOOP_TREE_NODE (a1)->parent; | |
| 546 if ((parent_a1 = ALLOCNO_CAP (a1)) == NULL) | |
| 547 parent_a1 = parent->regno_allocno_map[ALLOCNO_REGNO (a1)]; | |
| 548 if ((parent_a2 = ALLOCNO_CAP (a2)) == NULL) | |
| 549 parent_a2 = parent->regno_allocno_map[ALLOCNO_REGNO (a2)]; | |
| 550 ira_assert (parent_a1 != NULL && parent_a2 != NULL); | |
| 551 if (! CONFLICT_ALLOCNO_P (parent_a1, parent_a2)) | |
| 552 ira_add_allocno_copy (parent_a1, parent_a2, cp->freq, | |
| 553 cp->constraint_p, cp->insn, cp->loop_tree_node); | |
| 554 } | |
| 555 } | |
| 556 | |
| 557 /* Array used to collect all conflict allocnos for given allocno. */ | |
| 558 static ira_allocno_t *collected_conflict_allocnos; | |
| 559 | |
| 560 /* Build conflict vectors or bit conflict vectors (whatever is more | |
| 561 profitable) for allocno A from the conflict table and propagate the | |
| 562 conflicts to upper level allocno. */ | |
| 563 static void | |
| 564 build_allocno_conflicts (ira_allocno_t a) | |
| 565 { | |
| 566 int i, px, parent_num; | |
| 567 int conflict_bit_vec_words_num; | |
| 568 ira_loop_tree_node_t parent; | |
| 569 ira_allocno_t parent_a, another_a, another_parent_a; | |
| 570 ira_allocno_t *vec; | |
| 571 IRA_INT_TYPE *allocno_conflicts; | |
| 572 ira_allocno_set_iterator asi; | |
| 573 | |
| 574 allocno_conflicts = conflicts[ALLOCNO_NUM (a)]; | |
| 575 px = 0; | |
| 576 FOR_EACH_ALLOCNO_IN_SET (allocno_conflicts, | |
| 577 ALLOCNO_MIN (a), ALLOCNO_MAX (a), i, asi) | |
| 578 { | |
| 579 another_a = ira_conflict_id_allocno_map[i]; | |
| 580 ira_assert (ira_reg_classes_intersect_p | |
| 581 [ALLOCNO_COVER_CLASS (a)][ALLOCNO_COVER_CLASS (another_a)]); | |
| 582 collected_conflict_allocnos[px++] = another_a; | |
| 583 } | |
| 584 if (ira_conflict_vector_profitable_p (a, px)) | |
| 585 { | |
| 586 ira_allocate_allocno_conflict_vec (a, px); | |
| 587 vec = (ira_allocno_t*) ALLOCNO_CONFLICT_ALLOCNO_ARRAY (a); | |
| 588 memcpy (vec, collected_conflict_allocnos, sizeof (ira_allocno_t) * px); | |
| 589 vec[px] = NULL; | |
| 590 ALLOCNO_CONFLICT_ALLOCNOS_NUM (a) = px; | |
| 591 } | |
| 592 else | |
| 593 { | |
| 594 ALLOCNO_CONFLICT_ALLOCNO_ARRAY (a) = conflicts[ALLOCNO_NUM (a)]; | |
| 595 if (ALLOCNO_MAX (a) < ALLOCNO_MIN (a)) | |
| 596 conflict_bit_vec_words_num = 0; | |
| 597 else | |
| 598 conflict_bit_vec_words_num | |
| 599 = ((ALLOCNO_MAX (a) - ALLOCNO_MIN (a) + IRA_INT_BITS) | |
| 600 / IRA_INT_BITS); | |
| 601 ALLOCNO_CONFLICT_ALLOCNO_ARRAY_SIZE (a) | |
| 602 = conflict_bit_vec_words_num * sizeof (IRA_INT_TYPE); | |
| 603 } | |
| 604 parent = ALLOCNO_LOOP_TREE_NODE (a)->parent; | |
| 605 if ((parent_a = ALLOCNO_CAP (a)) == NULL | |
| 606 && (parent == NULL | |
| 607 || (parent_a = parent->regno_allocno_map[ALLOCNO_REGNO (a)]) | |
| 608 == NULL)) | |
| 609 return; | |
| 610 ira_assert (parent != NULL); | |
| 611 ira_assert (ALLOCNO_COVER_CLASS (a) == ALLOCNO_COVER_CLASS (parent_a)); | |
| 612 parent_num = ALLOCNO_NUM (parent_a); | |
| 613 FOR_EACH_ALLOCNO_IN_SET (allocno_conflicts, | |
| 614 ALLOCNO_MIN (a), ALLOCNO_MAX (a), i, asi) | |
| 615 { | |
| 616 another_a = ira_conflict_id_allocno_map[i]; | |
| 617 ira_assert (ira_reg_classes_intersect_p | |
| 618 [ALLOCNO_COVER_CLASS (a)][ALLOCNO_COVER_CLASS (another_a)]); | |
| 619 if ((another_parent_a = ALLOCNO_CAP (another_a)) == NULL | |
| 620 && (another_parent_a = (parent->regno_allocno_map | |
| 621 [ALLOCNO_REGNO (another_a)])) == NULL) | |
| 622 continue; | |
| 623 ira_assert (ALLOCNO_NUM (another_parent_a) >= 0); | |
| 624 ira_assert (ALLOCNO_COVER_CLASS (another_a) | |
| 625 == ALLOCNO_COVER_CLASS (another_parent_a)); | |
| 626 SET_ALLOCNO_SET_BIT (conflicts[parent_num], | |
| 627 ALLOCNO_CONFLICT_ID (another_parent_a), | |
| 628 ALLOCNO_MIN (parent_a), | |
| 629 ALLOCNO_MAX (parent_a)); | |
| 630 } | |
| 631 } | |
| 632 | |
| 633 /* Build conflict vectors or bit conflict vectors (whatever is more | |
| 634 profitable) of all allocnos from the conflict table. */ | |
| 635 static void | |
| 636 build_conflicts (void) | |
| 637 { | |
| 638 int i; | |
| 639 ira_allocno_t a, cap; | |
| 640 | |
| 641 collected_conflict_allocnos | |
| 642 = (ira_allocno_t *) ira_allocate (sizeof (ira_allocno_t) | |
| 643 * ira_allocnos_num); | |
| 644 for (i = max_reg_num () - 1; i >= FIRST_PSEUDO_REGISTER; i--) | |
| 645 for (a = ira_regno_allocno_map[i]; | |
| 646 a != NULL; | |
| 647 a = ALLOCNO_NEXT_REGNO_ALLOCNO (a)) | |
| 648 { | |
| 649 build_allocno_conflicts (a); | |
| 650 for (cap = ALLOCNO_CAP (a); cap != NULL; cap = ALLOCNO_CAP (cap)) | |
| 651 build_allocno_conflicts (cap); | |
| 652 } | |
| 653 ira_free (collected_conflict_allocnos); | |
| 654 } | |
| 655 | |
| 656 | |
| 657 | |
| 658 /* Print hard reg set SET with TITLE to FILE. */ | |
| 659 static void | |
| 660 print_hard_reg_set (FILE *file, const char *title, HARD_REG_SET set) | |
| 661 { | |
| 662 int i, start; | |
| 663 | |
|
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664 fputs (title, file); |
| 0 | 665 for (start = -1, i = 0; i < FIRST_PSEUDO_REGISTER; i++) |
| 666 { | |
| 667 if (TEST_HARD_REG_BIT (set, i)) | |
| 668 { | |
| 669 if (i == 0 || ! TEST_HARD_REG_BIT (set, i - 1)) | |
| 670 start = i; | |
| 671 } | |
| 672 if (start >= 0 | |
| 673 && (i == FIRST_PSEUDO_REGISTER - 1 || ! TEST_HARD_REG_BIT (set, i))) | |
| 674 { | |
| 675 if (start == i - 1) | |
| 676 fprintf (file, " %d", start); | |
| 677 else if (start == i - 2) | |
| 678 fprintf (file, " %d %d", start, start + 1); | |
| 679 else | |
| 680 fprintf (file, " %d-%d", start, i - 1); | |
| 681 start = -1; | |
| 682 } | |
| 683 } | |
|
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684 putc ('\n', file); |
| 0 | 685 } |
| 686 | |
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687 static void |
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688 print_allocno_conflicts (FILE * file, bool reg_p, ira_allocno_t a) |
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689 { |
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690 HARD_REG_SET conflicting_hard_regs; |
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691 ira_allocno_t conflict_a; |
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692 ira_allocno_conflict_iterator aci; |
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693 basic_block bb; |
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694 |
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695 if (reg_p) |
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696 fprintf (file, ";; r%d", ALLOCNO_REGNO (a)); |
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697 else |
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698 { |
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699 fprintf (file, ";; a%d(r%d,", ALLOCNO_NUM (a), ALLOCNO_REGNO (a)); |
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700 if ((bb = ALLOCNO_LOOP_TREE_NODE (a)->bb) != NULL) |
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701 fprintf (file, "b%d", bb->index); |
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702 else |
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703 fprintf (file, "l%d", ALLOCNO_LOOP_TREE_NODE (a)->loop->num); |
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704 putc (')', file); |
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705 } |
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706 fputs (" conflicts:", file); |
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707 if (ALLOCNO_CONFLICT_ALLOCNO_ARRAY (a) != NULL) |
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708 FOR_EACH_ALLOCNO_CONFLICT (a, conflict_a, aci) |
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709 { |
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710 if (reg_p) |
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711 fprintf (file, " r%d,", ALLOCNO_REGNO (conflict_a)); |
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712 else |
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713 { |
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714 fprintf (file, " a%d(r%d,", ALLOCNO_NUM (conflict_a), |
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715 ALLOCNO_REGNO (conflict_a)); |
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716 if ((bb = ALLOCNO_LOOP_TREE_NODE (conflict_a)->bb) != NULL) |
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717 fprintf (file, "b%d)", bb->index); |
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718 else |
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719 fprintf (file, "l%d)", |
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720 ALLOCNO_LOOP_TREE_NODE (conflict_a)->loop->num); |
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721 } |
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722 } |
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723 COPY_HARD_REG_SET (conflicting_hard_regs, |
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724 ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a)); |
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725 AND_COMPL_HARD_REG_SET (conflicting_hard_regs, ira_no_alloc_regs); |
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726 AND_HARD_REG_SET (conflicting_hard_regs, |
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727 reg_class_contents[ALLOCNO_COVER_CLASS (a)]); |
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728 print_hard_reg_set (file, "\n;; total conflict hard regs:", |
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729 conflicting_hard_regs); |
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730 COPY_HARD_REG_SET (conflicting_hard_regs, |
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731 ALLOCNO_CONFLICT_HARD_REGS (a)); |
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732 AND_COMPL_HARD_REG_SET (conflicting_hard_regs, ira_no_alloc_regs); |
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733 AND_HARD_REG_SET (conflicting_hard_regs, |
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734 reg_class_contents[ALLOCNO_COVER_CLASS (a)]); |
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735 print_hard_reg_set (file, ";; conflict hard regs:", |
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736 conflicting_hard_regs); |
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737 putc ('\n', file); |
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738 } |
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739 |
| 0 | 740 /* Print information about allocno or only regno (if REG_P) conflicts |
| 741 to FILE. */ | |
| 742 static void | |
| 743 print_conflicts (FILE *file, bool reg_p) | |
| 744 { | |
| 745 ira_allocno_t a; | |
| 746 ira_allocno_iterator ai; | |
| 747 | |
| 748 FOR_EACH_ALLOCNO (a, ai) | |
|
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749 print_allocno_conflicts (file, reg_p, a); |
| 0 | 750 } |
| 751 | |
| 752 /* Print information about allocno or only regno (if REG_P) conflicts | |
| 753 to stderr. */ | |
| 754 void | |
| 755 ira_debug_conflicts (bool reg_p) | |
| 756 { | |
| 757 print_conflicts (stderr, reg_p); | |
| 758 } | |
| 759 | |
| 760 | |
| 761 | |
| 762 /* Entry function which builds allocno conflicts and allocno copies | |
| 763 and accumulate some allocno info on upper level regions. */ | |
| 764 void | |
| 765 ira_build_conflicts (void) | |
| 766 { | |
| 767 ira_allocno_t a; | |
| 768 ira_allocno_iterator ai; | |
| 769 HARD_REG_SET temp_hard_reg_set; | |
| 770 | |
| 771 if (ira_conflicts_p) | |
| 772 { | |
| 773 ira_conflicts_p = build_conflict_bit_table (); | |
| 774 if (ira_conflicts_p) | |
| 775 { | |
| 776 build_conflicts (); | |
| 777 ira_traverse_loop_tree (true, ira_loop_tree_root, NULL, add_copies); | |
| 778 /* We need finished conflict table for the subsequent call. */ | |
| 779 if (flag_ira_region == IRA_REGION_ALL | |
| 780 || flag_ira_region == IRA_REGION_MIXED) | |
| 781 propagate_copies (); | |
| 782 /* Now we can free memory for the conflict table (see function | |
| 783 build_allocno_conflicts for details). */ | |
| 784 FOR_EACH_ALLOCNO (a, ai) | |
| 785 { | |
| 786 if (ALLOCNO_CONFLICT_ALLOCNO_ARRAY (a) | |
| 787 != conflicts[ALLOCNO_NUM (a)]) | |
| 788 ira_free (conflicts[ALLOCNO_NUM (a)]); | |
| 789 } | |
| 790 ira_free (conflicts); | |
| 791 } | |
| 792 } | |
| 793 if (! CLASS_LIKELY_SPILLED_P (base_reg_class (VOIDmode, ADDRESS, SCRATCH))) | |
| 794 CLEAR_HARD_REG_SET (temp_hard_reg_set); | |
| 795 else | |
| 796 { | |
| 797 COPY_HARD_REG_SET (temp_hard_reg_set, | |
| 798 reg_class_contents[base_reg_class (VOIDmode, ADDRESS, SCRATCH)]); | |
| 799 AND_COMPL_HARD_REG_SET (temp_hard_reg_set, ira_no_alloc_regs); | |
| 800 AND_HARD_REG_SET (temp_hard_reg_set, call_used_reg_set); | |
| 801 } | |
| 802 FOR_EACH_ALLOCNO (a, ai) | |
| 803 { | |
| 804 reg_attrs *attrs; | |
| 805 tree decl; | |
| 806 | |
| 807 if ((! flag_caller_saves && ALLOCNO_CALLS_CROSSED_NUM (a) != 0) | |
| 808 /* For debugging purposes don't put user defined variables in | |
| 809 callee-clobbered registers. */ | |
|
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810 || (optimize == 0 |
| 0 | 811 && (attrs = REG_ATTRS (regno_reg_rtx [ALLOCNO_REGNO (a)])) != NULL |
| 812 && (decl = attrs->decl) != NULL | |
| 813 && VAR_OR_FUNCTION_DECL_P (decl) | |
| 814 && ! DECL_ARTIFICIAL (decl))) | |
| 815 { | |
| 816 IOR_HARD_REG_SET (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a), | |
| 817 call_used_reg_set); | |
| 818 IOR_HARD_REG_SET (ALLOCNO_CONFLICT_HARD_REGS (a), | |
| 819 call_used_reg_set); | |
| 820 } | |
| 821 else if (ALLOCNO_CALLS_CROSSED_NUM (a) != 0) | |
| 822 { | |
| 823 IOR_HARD_REG_SET (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a), | |
| 824 no_caller_save_reg_set); | |
| 825 IOR_HARD_REG_SET (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a), | |
| 826 temp_hard_reg_set); | |
| 827 IOR_HARD_REG_SET (ALLOCNO_CONFLICT_HARD_REGS (a), | |
| 828 no_caller_save_reg_set); | |
| 829 IOR_HARD_REG_SET (ALLOCNO_CONFLICT_HARD_REGS (a), | |
| 830 temp_hard_reg_set); | |
| 831 } | |
| 832 } | |
| 833 if (optimize && ira_conflicts_p | |
| 834 && internal_flag_ira_verbose > 2 && ira_dump_file != NULL) | |
| 835 print_conflicts (ira_dump_file, false); | |
| 836 } |