1 /* Sets (bit vectors) of hard registers, and operations on them. 2 Copyright (C) 1987-2013 Free Software Foundation, Inc. 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 #ifndef GCC_HARD_REG_SET_H 21 #define GCC_HARD_REG_SET_H 22 23 /* Define the type of a set of hard registers. */ 24 25 /* HARD_REG_ELT_TYPE is a typedef of the unsigned integral type which 26 will be used for hard reg sets, either alone or in an array. 27 28 If HARD_REG_SET is a macro, its definition is HARD_REG_ELT_TYPE, 29 and it has enough bits to represent all the target machine's hard 30 registers. Otherwise, it is a typedef for a suitably sized array 31 of HARD_REG_ELT_TYPEs. HARD_REG_SET_LONGS is defined as how many. 32 33 Note that lots of code assumes that the first part of a regset is 34 the same format as a HARD_REG_SET. To help make sure this is true, 35 we only try the widest fast integer mode (HOST_WIDEST_FAST_INT) 36 instead of all the smaller types. This approach loses only if 37 there are very few registers and then only in the few cases where 38 we have an array of HARD_REG_SETs, so it needn't be as complex as 39 it used to be. */ 40 41 typedef unsigned HOST_WIDEST_FAST_INT HARD_REG_ELT_TYPE; 42 43 #if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_WIDEST_FAST_INT 44 45 #define HARD_REG_SET HARD_REG_ELT_TYPE 46 47 #else 48 49 #define HARD_REG_SET_LONGS \ 50 ((FIRST_PSEUDO_REGISTER + HOST_BITS_PER_WIDEST_FAST_INT - 1) \ 51 / HOST_BITS_PER_WIDEST_FAST_INT) 52 typedef HARD_REG_ELT_TYPE HARD_REG_SET[HARD_REG_SET_LONGS]; 53 54 #endif 55 56 /* HARD_REG_SET wrapped into a structure, to make it possible to 57 use HARD_REG_SET even in APIs that should not include 58 hard-reg-set.h. */ 59 struct hard_reg_set_container 60 { 61 HARD_REG_SET set; 62 }; 63 64 /* HARD_CONST is used to cast a constant to the appropriate type 65 for use with a HARD_REG_SET. */ 66 67 #define HARD_CONST(X) ((HARD_REG_ELT_TYPE) (X)) 68 69 /* Define macros SET_HARD_REG_BIT, CLEAR_HARD_REG_BIT and TEST_HARD_REG_BIT 70 to set, clear or test one bit in a hard reg set of type HARD_REG_SET. 71 All three take two arguments: the set and the register number. 72 73 In the case where sets are arrays of longs, the first argument 74 is actually a pointer to a long. 75 76 Define two macros for initializing a set: 77 CLEAR_HARD_REG_SET and SET_HARD_REG_SET. 78 These take just one argument. 79 80 Also define macros for copying hard reg sets: 81 COPY_HARD_REG_SET and COMPL_HARD_REG_SET. 82 These take two arguments TO and FROM; they read from FROM 83 and store into TO. COMPL_HARD_REG_SET complements each bit. 84 85 Also define macros for combining hard reg sets: 86 IOR_HARD_REG_SET and AND_HARD_REG_SET. 87 These take two arguments TO and FROM; they read from FROM 88 and combine bitwise into TO. Define also two variants 89 IOR_COMPL_HARD_REG_SET and AND_COMPL_HARD_REG_SET 90 which use the complement of the set FROM. 91 92 Also define: 93 94 hard_reg_set_subset_p (X, Y), which returns true if X is a subset of Y. 95 hard_reg_set_equal_p (X, Y), which returns true if X and Y are equal. 96 hard_reg_set_intersect_p (X, Y), which returns true if X and Y intersect. 97 hard_reg_set_empty_p (X), which returns true if X is empty. */ 98 99 #define UHOST_BITS_PER_WIDE_INT ((unsigned) HOST_BITS_PER_WIDEST_FAST_INT) 100 101 #ifdef HARD_REG_SET 102 103 #define SET_HARD_REG_BIT(SET, BIT) \ 104 ((SET) |= HARD_CONST (1) << (BIT)) 105 #define CLEAR_HARD_REG_BIT(SET, BIT) \ 106 ((SET) &= ~(HARD_CONST (1) << (BIT))) 107 #define TEST_HARD_REG_BIT(SET, BIT) \ 108 (!!((SET) & (HARD_CONST (1) << (BIT)))) 109 110 #define CLEAR_HARD_REG_SET(TO) ((TO) = HARD_CONST (0)) 111 #define SET_HARD_REG_SET(TO) ((TO) = ~ HARD_CONST (0)) 112 113 #define COPY_HARD_REG_SET(TO, FROM) ((TO) = (FROM)) 114 #define COMPL_HARD_REG_SET(TO, FROM) ((TO) = ~(FROM)) 115 116 #define IOR_HARD_REG_SET(TO, FROM) ((TO) |= (FROM)) 117 #define IOR_COMPL_HARD_REG_SET(TO, FROM) ((TO) |= ~ (FROM)) 118 #define AND_HARD_REG_SET(TO, FROM) ((TO) &= (FROM)) 119 #define AND_COMPL_HARD_REG_SET(TO, FROM) ((TO) &= ~ (FROM)) 120 121 static inline bool 122 hard_reg_set_subset_p (const HARD_REG_SET x, const HARD_REG_SET y) 123 { 124 return (x & ~y) == HARD_CONST (0); 125 } 126 127 static inline bool 128 hard_reg_set_equal_p (const HARD_REG_SET x, const HARD_REG_SET y) 129 { 130 return x == y; 131 } 132 133 static inline bool 134 hard_reg_set_intersect_p (const HARD_REG_SET x, const HARD_REG_SET y) 135 { 136 return (x & y) != HARD_CONST (0); 137 } 138 139 static inline bool 140 hard_reg_set_empty_p (const HARD_REG_SET x) 141 { 142 return x == HARD_CONST (0); 143 } 144 145 #else 146 147 #define SET_HARD_REG_BIT(SET, BIT) \ 148 ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ 149 |= HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT)) 150 151 #define CLEAR_HARD_REG_BIT(SET, BIT) \ 152 ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ 153 &= ~(HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))) 154 155 #define TEST_HARD_REG_BIT(SET, BIT) \ 156 (!!((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ 157 & (HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT)))) 158 159 #if FIRST_PSEUDO_REGISTER <= 2*HOST_BITS_PER_WIDEST_FAST_INT 160 #define CLEAR_HARD_REG_SET(TO) \ 161 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ 162 scan_tp_[0] = 0; \ 163 scan_tp_[1] = 0; } while (0) 164 165 #define SET_HARD_REG_SET(TO) \ 166 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ 167 scan_tp_[0] = -1; \ 168 scan_tp_[1] = -1; } while (0) 169 170 #define COPY_HARD_REG_SET(TO, FROM) \ 171 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 172 scan_tp_[0] = scan_fp_[0]; \ 173 scan_tp_[1] = scan_fp_[1]; } while (0) 174 175 #define COMPL_HARD_REG_SET(TO, FROM) \ 176 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 177 scan_tp_[0] = ~ scan_fp_[0]; \ 178 scan_tp_[1] = ~ scan_fp_[1]; } while (0) 179 180 #define AND_HARD_REG_SET(TO, FROM) \ 181 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 182 scan_tp_[0] &= scan_fp_[0]; \ 183 scan_tp_[1] &= scan_fp_[1]; } while (0) 184 185 #define AND_COMPL_HARD_REG_SET(TO, FROM) \ 186 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 187 scan_tp_[0] &= ~ scan_fp_[0]; \ 188 scan_tp_[1] &= ~ scan_fp_[1]; } while (0) 189 190 #define IOR_HARD_REG_SET(TO, FROM) \ 191 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 192 scan_tp_[0] |= scan_fp_[0]; \ 193 scan_tp_[1] |= scan_fp_[1]; } while (0) 194 195 #define IOR_COMPL_HARD_REG_SET(TO, FROM) \ 196 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 197 scan_tp_[0] |= ~ scan_fp_[0]; \ 198 scan_tp_[1] |= ~ scan_fp_[1]; } while (0) 199 200 static inline bool 201 hard_reg_set_subset_p (const HARD_REG_SET x, const HARD_REG_SET y) 202 { 203 return (x[0] & ~y[0]) == 0 && (x[1] & ~y[1]) == 0; 204 } 205 206 static inline bool 207 hard_reg_set_equal_p (const HARD_REG_SET x, const HARD_REG_SET y) 208 { 209 return x[0] == y[0] && x[1] == y[1]; 210 } 211 212 static inline bool 213 hard_reg_set_intersect_p (const HARD_REG_SET x, const HARD_REG_SET y) 214 { 215 return (x[0] & y[0]) != 0 || (x[1] & y[1]) != 0; 216 } 217 218 static inline bool 219 hard_reg_set_empty_p (const HARD_REG_SET x) 220 { 221 return x[0] == 0 && x[1] == 0; 222 } 223 224 #else 225 #if FIRST_PSEUDO_REGISTER <= 3*HOST_BITS_PER_WIDEST_FAST_INT 226 #define CLEAR_HARD_REG_SET(TO) \ 227 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ 228 scan_tp_[0] = 0; \ 229 scan_tp_[1] = 0; \ 230 scan_tp_[2] = 0; } while (0) 231 232 #define SET_HARD_REG_SET(TO) \ 233 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ 234 scan_tp_[0] = -1; \ 235 scan_tp_[1] = -1; \ 236 scan_tp_[2] = -1; } while (0) 237 238 #define COPY_HARD_REG_SET(TO, FROM) \ 239 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 240 scan_tp_[0] = scan_fp_[0]; \ 241 scan_tp_[1] = scan_fp_[1]; \ 242 scan_tp_[2] = scan_fp_[2]; } while (0) 243 244 #define COMPL_HARD_REG_SET(TO, FROM) \ 245 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 246 scan_tp_[0] = ~ scan_fp_[0]; \ 247 scan_tp_[1] = ~ scan_fp_[1]; \ 248 scan_tp_[2] = ~ scan_fp_[2]; } while (0) 249 250 #define AND_HARD_REG_SET(TO, FROM) \ 251 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 252 scan_tp_[0] &= scan_fp_[0]; \ 253 scan_tp_[1] &= scan_fp_[1]; \ 254 scan_tp_[2] &= scan_fp_[2]; } while (0) 255 256 #define AND_COMPL_HARD_REG_SET(TO, FROM) \ 257 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 258 scan_tp_[0] &= ~ scan_fp_[0]; \ 259 scan_tp_[1] &= ~ scan_fp_[1]; \ 260 scan_tp_[2] &= ~ scan_fp_[2]; } while (0) 261 262 #define IOR_HARD_REG_SET(TO, FROM) \ 263 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 264 scan_tp_[0] |= scan_fp_[0]; \ 265 scan_tp_[1] |= scan_fp_[1]; \ 266 scan_tp_[2] |= scan_fp_[2]; } while (0) 267 268 #define IOR_COMPL_HARD_REG_SET(TO, FROM) \ 269 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 270 scan_tp_[0] |= ~ scan_fp_[0]; \ 271 scan_tp_[1] |= ~ scan_fp_[1]; \ 272 scan_tp_[2] |= ~ scan_fp_[2]; } while (0) 273 274 static inline bool 275 hard_reg_set_subset_p (const HARD_REG_SET x, const HARD_REG_SET y) 276 { 277 return ((x[0] & ~y[0]) == 0 278 && (x[1] & ~y[1]) == 0 279 && (x[2] & ~y[2]) == 0); 280 } 281 282 static inline bool 283 hard_reg_set_equal_p (const HARD_REG_SET x, const HARD_REG_SET y) 284 { 285 return x[0] == y[0] && x[1] == y[1] && x[2] == y[2]; 286 } 287 288 static inline bool 289 hard_reg_set_intersect_p (const HARD_REG_SET x, const HARD_REG_SET y) 290 { 291 return ((x[0] & y[0]) != 0 292 || (x[1] & y[1]) != 0 293 || (x[2] & y[2]) != 0); 294 } 295 296 static inline bool 297 hard_reg_set_empty_p (const HARD_REG_SET x) 298 { 299 return x[0] == 0 && x[1] == 0 && x[2] == 0; 300 } 301 302 #else 303 #if FIRST_PSEUDO_REGISTER <= 4*HOST_BITS_PER_WIDEST_FAST_INT 304 #define CLEAR_HARD_REG_SET(TO) \ 305 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ 306 scan_tp_[0] = 0; \ 307 scan_tp_[1] = 0; \ 308 scan_tp_[2] = 0; \ 309 scan_tp_[3] = 0; } while (0) 310 311 #define SET_HARD_REG_SET(TO) \ 312 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ 313 scan_tp_[0] = -1; \ 314 scan_tp_[1] = -1; \ 315 scan_tp_[2] = -1; \ 316 scan_tp_[3] = -1; } while (0) 317 318 #define COPY_HARD_REG_SET(TO, FROM) \ 319 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 320 scan_tp_[0] = scan_fp_[0]; \ 321 scan_tp_[1] = scan_fp_[1]; \ 322 scan_tp_[2] = scan_fp_[2]; \ 323 scan_tp_[3] = scan_fp_[3]; } while (0) 324 325 #define COMPL_HARD_REG_SET(TO, FROM) \ 326 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 327 scan_tp_[0] = ~ scan_fp_[0]; \ 328 scan_tp_[1] = ~ scan_fp_[1]; \ 329 scan_tp_[2] = ~ scan_fp_[2]; \ 330 scan_tp_[3] = ~ scan_fp_[3]; } while (0) 331 332 #define AND_HARD_REG_SET(TO, FROM) \ 333 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 334 scan_tp_[0] &= scan_fp_[0]; \ 335 scan_tp_[1] &= scan_fp_[1]; \ 336 scan_tp_[2] &= scan_fp_[2]; \ 337 scan_tp_[3] &= scan_fp_[3]; } while (0) 338 339 #define AND_COMPL_HARD_REG_SET(TO, FROM) \ 340 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 341 scan_tp_[0] &= ~ scan_fp_[0]; \ 342 scan_tp_[1] &= ~ scan_fp_[1]; \ 343 scan_tp_[2] &= ~ scan_fp_[2]; \ 344 scan_tp_[3] &= ~ scan_fp_[3]; } while (0) 345 346 #define IOR_HARD_REG_SET(TO, FROM) \ 347 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 348 scan_tp_[0] |= scan_fp_[0]; \ 349 scan_tp_[1] |= scan_fp_[1]; \ 350 scan_tp_[2] |= scan_fp_[2]; \ 351 scan_tp_[3] |= scan_fp_[3]; } while (0) 352 353 #define IOR_COMPL_HARD_REG_SET(TO, FROM) \ 354 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 355 scan_tp_[0] |= ~ scan_fp_[0]; \ 356 scan_tp_[1] |= ~ scan_fp_[1]; \ 357 scan_tp_[2] |= ~ scan_fp_[2]; \ 358 scan_tp_[3] |= ~ scan_fp_[3]; } while (0) 359 360 static inline bool 361 hard_reg_set_subset_p (const HARD_REG_SET x, const HARD_REG_SET y) 362 { 363 return ((x[0] & ~y[0]) == 0 364 && (x[1] & ~y[1]) == 0 365 && (x[2] & ~y[2]) == 0 366 && (x[3] & ~y[3]) == 0); 367 } 368 369 static inline bool 370 hard_reg_set_equal_p (const HARD_REG_SET x, const HARD_REG_SET y) 371 { 372 return x[0] == y[0] && x[1] == y[1] && x[2] == y[2] && x[3] == y[3]; 373 } 374 375 static inline bool 376 hard_reg_set_intersect_p (const HARD_REG_SET x, const HARD_REG_SET y) 377 { 378 return ((x[0] & y[0]) != 0 379 || (x[1] & y[1]) != 0 380 || (x[2] & y[2]) != 0 381 || (x[3] & y[3]) != 0); 382 } 383 384 static inline bool 385 hard_reg_set_empty_p (const HARD_REG_SET x) 386 { 387 return x[0] == 0 && x[1] == 0 && x[2] == 0 && x[3] == 0; 388 } 389 390 #else /* FIRST_PSEUDO_REGISTER > 4*HOST_BITS_PER_WIDEST_FAST_INT */ 391 392 #define CLEAR_HARD_REG_SET(TO) \ 393 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ 394 int i; \ 395 for (i = 0; i < HARD_REG_SET_LONGS; i++) \ 396 *scan_tp_++ = 0; } while (0) 397 398 #define SET_HARD_REG_SET(TO) \ 399 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ 400 int i; \ 401 for (i = 0; i < HARD_REG_SET_LONGS; i++) \ 402 *scan_tp_++ = -1; } while (0) 403 404 #define COPY_HARD_REG_SET(TO, FROM) \ 405 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 406 int i; \ 407 for (i = 0; i < HARD_REG_SET_LONGS; i++) \ 408 *scan_tp_++ = *scan_fp_++; } while (0) 409 410 #define COMPL_HARD_REG_SET(TO, FROM) \ 411 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 412 int i; \ 413 for (i = 0; i < HARD_REG_SET_LONGS; i++) \ 414 *scan_tp_++ = ~ *scan_fp_++; } while (0) 415 416 #define AND_HARD_REG_SET(TO, FROM) \ 417 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 418 int i; \ 419 for (i = 0; i < HARD_REG_SET_LONGS; i++) \ 420 *scan_tp_++ &= *scan_fp_++; } while (0) 421 422 #define AND_COMPL_HARD_REG_SET(TO, FROM) \ 423 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 424 int i; \ 425 for (i = 0; i < HARD_REG_SET_LONGS; i++) \ 426 *scan_tp_++ &= ~ *scan_fp_++; } while (0) 427 428 #define IOR_HARD_REG_SET(TO, FROM) \ 429 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 430 int i; \ 431 for (i = 0; i < HARD_REG_SET_LONGS; i++) \ 432 *scan_tp_++ |= *scan_fp_++; } while (0) 433 434 #define IOR_COMPL_HARD_REG_SET(TO, FROM) \ 435 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ 436 int i; \ 437 for (i = 0; i < HARD_REG_SET_LONGS; i++) \ 438 *scan_tp_++ |= ~ *scan_fp_++; } while (0) 439 440 static inline bool 441 hard_reg_set_subset_p (const HARD_REG_SET x, const HARD_REG_SET y) 442 { 443 int i; 444 445 for (i = 0; i < HARD_REG_SET_LONGS; i++) 446 if ((x[i] & ~y[i]) != 0) 447 return false; 448 return true; 449 } 450 451 static inline bool 452 hard_reg_set_equal_p (const HARD_REG_SET x, const HARD_REG_SET y) 453 { 454 int i; 455 456 for (i = 0; i < HARD_REG_SET_LONGS; i++) 457 if (x[i] != y[i]) 458 return false; 459 return true; 460 } 461 462 static inline bool 463 hard_reg_set_intersect_p (const HARD_REG_SET x, const HARD_REG_SET y) 464 { 465 int i; 466 467 for (i = 0; i < HARD_REG_SET_LONGS; i++) 468 if ((x[i] & y[i]) != 0) 469 return true; 470 return false; 471 } 472 473 static inline bool 474 hard_reg_set_empty_p (const HARD_REG_SET x) 475 { 476 int i; 477 478 for (i = 0; i < HARD_REG_SET_LONGS; i++) 479 if (x[i] != 0) 480 return false; 481 return true; 482 } 483 484 #endif 485 #endif 486 #endif 487 #endif 488 489 /* Iterator for hard register sets. */ 490 491 typedef struct 492 { 493 /* Pointer to the current element. */ 494 HARD_REG_ELT_TYPE *pelt; 495 496 /* The length of the set. */ 497 unsigned short length; 498 499 /* Word within the current element. */ 500 unsigned short word_no; 501 502 /* Contents of the actually processed word. When finding next bit 503 it is shifted right, so that the actual bit is always the least 504 significant bit of ACTUAL. */ 505 HARD_REG_ELT_TYPE bits; 506 } hard_reg_set_iterator; 507 508 #define HARD_REG_ELT_BITS UHOST_BITS_PER_WIDE_INT 509 510 /* The implementation of the iterator functions is fully analogous to 511 the bitmap iterators. */ 512 static inline void 513 hard_reg_set_iter_init (hard_reg_set_iterator *iter, HARD_REG_SET set, 514 unsigned min, unsigned *regno) 515 { 516 #ifdef HARD_REG_SET_LONGS 517 iter->pelt = set; 518 iter->length = HARD_REG_SET_LONGS; 519 #else 520 iter->pelt = &set; 521 iter->length = 1; 522 #endif 523 iter->word_no = min / HARD_REG_ELT_BITS; 524 if (iter->word_no < iter->length) 525 { 526 iter->bits = iter->pelt[iter->word_no]; 527 iter->bits >>= min % HARD_REG_ELT_BITS; 528 529 /* This is required for correct search of the next bit. */ 530 min += !iter->bits; 531 } 532 *regno = min; 533 } 534 535 static inline bool 536 hard_reg_set_iter_set (hard_reg_set_iterator *iter, unsigned *regno) 537 { 538 while (1) 539 { 540 /* Return false when we're advanced past the end of the set. */ 541 if (iter->word_no >= iter->length) 542 return false; 543 544 if (iter->bits) 545 { 546 /* Find the correct bit and return it. */ 547 while (!(iter->bits & 1)) 548 { 549 iter->bits >>= 1; 550 *regno += 1; 551 } 552 return (*regno < FIRST_PSEUDO_REGISTER); 553 } 554 555 /* Round to the beginning of the next word. */ 556 *regno = (*regno + HARD_REG_ELT_BITS - 1); 557 *regno -= *regno % HARD_REG_ELT_BITS; 558 559 /* Find the next non-zero word. */ 560 while (++iter->word_no < iter->length) 561 { 562 iter->bits = iter->pelt[iter->word_no]; 563 if (iter->bits) 564 break; 565 *regno += HARD_REG_ELT_BITS; 566 } 567 } 568 } 569 570 static inline void 571 hard_reg_set_iter_next (hard_reg_set_iterator *iter, unsigned *regno) 572 { 573 iter->bits >>= 1; 574 *regno += 1; 575 } 576 577 #define EXECUTE_IF_SET_IN_HARD_REG_SET(SET, MIN, REGNUM, ITER) \ 578 for (hard_reg_set_iter_init (&(ITER), (SET), (MIN), &(REGNUM)); \ 579 hard_reg_set_iter_set (&(ITER), &(REGNUM)); \ 580 hard_reg_set_iter_next (&(ITER), &(REGNUM))) 581 582 583 /* Define some standard sets of registers. */ 584 585 /* Indexed by hard register number, contains 1 for registers 586 that are being used for global register decls. 587 These must be exempt from ordinary flow analysis 588 and are also considered fixed. */ 589 590 extern char global_regs[FIRST_PSEUDO_REGISTER]; 591 592 struct target_hard_regs { 593 /* The set of registers that actually exist on the current target. */ 594 HARD_REG_SET x_accessible_reg_set; 595 596 /* The set of registers that should be considered to be register 597 operands. It is a subset of x_accessible_reg_set. */ 598 HARD_REG_SET x_operand_reg_set; 599 600 /* Indexed by hard register number, contains 1 for registers 601 that are fixed use (stack pointer, pc, frame pointer, etc.;. 602 These are the registers that cannot be used to allocate 603 a pseudo reg whose life does not cross calls. */ 604 char x_fixed_regs[FIRST_PSEUDO_REGISTER]; 605 606 /* The same info as a HARD_REG_SET. */ 607 HARD_REG_SET x_fixed_reg_set; 608 609 /* Indexed by hard register number, contains 1 for registers 610 that are fixed use or are clobbered by function calls. 611 These are the registers that cannot be used to allocate 612 a pseudo reg whose life crosses calls. */ 613 char x_call_used_regs[FIRST_PSEUDO_REGISTER]; 614 615 char x_call_really_used_regs[FIRST_PSEUDO_REGISTER]; 616 617 /* The same info as a HARD_REG_SET. */ 618 HARD_REG_SET x_call_used_reg_set; 619 620 /* Contains registers that are fixed use -- i.e. in fixed_reg_set -- or 621 a function value return register or TARGET_STRUCT_VALUE_RTX or 622 STATIC_CHAIN_REGNUM. These are the registers that cannot hold quantities 623 across calls even if we are willing to save and restore them. */ 624 HARD_REG_SET x_call_fixed_reg_set; 625 626 /* Contains 1 for registers that are set or clobbered by calls. */ 627 /* ??? Ideally, this would be just call_used_regs plus global_regs, but 628 for someone's bright idea to have call_used_regs strictly include 629 fixed_regs. Which leaves us guessing as to the set of fixed_regs 630 that are actually preserved. We know for sure that those associated 631 with the local stack frame are safe, but scant others. */ 632 HARD_REG_SET x_regs_invalidated_by_call; 633 634 /* Call used hard registers which can not be saved because there is no 635 insn for this. */ 636 HARD_REG_SET x_no_caller_save_reg_set; 637 638 /* Table of register numbers in the order in which to try to use them. */ 639 int x_reg_alloc_order[FIRST_PSEUDO_REGISTER]; 640 641 /* The inverse of reg_alloc_order. */ 642 int x_inv_reg_alloc_order[FIRST_PSEUDO_REGISTER]; 643 644 /* For each reg class, a HARD_REG_SET saying which registers are in it. */ 645 HARD_REG_SET x_reg_class_contents[N_REG_CLASSES]; 646 647 /* For each reg class, a boolean saying whether the class contains only 648 fixed registers. */ 649 bool x_class_only_fixed_regs[N_REG_CLASSES]; 650 651 /* For each reg class, number of regs it contains. */ 652 unsigned int x_reg_class_size[N_REG_CLASSES]; 653 654 /* For each reg class, table listing all the classes contained in it. */ 655 enum reg_class x_reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES]; 656 657 /* For each pair of reg classes, 658 a largest reg class contained in their union. */ 659 enum reg_class x_reg_class_subunion[N_REG_CLASSES][N_REG_CLASSES]; 660 661 /* For each pair of reg classes, 662 the smallest reg class that contains their union. */ 663 enum reg_class x_reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES]; 664 665 /* Vector indexed by hardware reg giving its name. */ 666 const char *x_reg_names[FIRST_PSEUDO_REGISTER]; 667 }; 668 669 extern struct target_hard_regs default_target_hard_regs; 670 #if SWITCHABLE_TARGET 671 extern struct target_hard_regs *this_target_hard_regs; 672 #else 673 #define this_target_hard_regs (&default_target_hard_regs) 674 #endif 675 676 #define accessible_reg_set \ 677 (this_target_hard_regs->x_accessible_reg_set) 678 #define operand_reg_set \ 679 (this_target_hard_regs->x_operand_reg_set) 680 #define fixed_regs \ 681 (this_target_hard_regs->x_fixed_regs) 682 #define fixed_reg_set \ 683 (this_target_hard_regs->x_fixed_reg_set) 684 #define call_used_regs \ 685 (this_target_hard_regs->x_call_used_regs) 686 #define call_really_used_regs \ 687 (this_target_hard_regs->x_call_really_used_regs) 688 #define call_used_reg_set \ 689 (this_target_hard_regs->x_call_used_reg_set) 690 #define call_fixed_reg_set \ 691 (this_target_hard_regs->x_call_fixed_reg_set) 692 #define regs_invalidated_by_call \ 693 (this_target_hard_regs->x_regs_invalidated_by_call) 694 #define no_caller_save_reg_set \ 695 (this_target_hard_regs->x_no_caller_save_reg_set) 696 #define reg_alloc_order \ 697 (this_target_hard_regs->x_reg_alloc_order) 698 #define inv_reg_alloc_order \ 699 (this_target_hard_regs->x_inv_reg_alloc_order) 700 #define reg_class_contents \ 701 (this_target_hard_regs->x_reg_class_contents) 702 #define class_only_fixed_regs \ 703 (this_target_hard_regs->x_class_only_fixed_regs) 704 #define reg_class_size \ 705 (this_target_hard_regs->x_reg_class_size) 706 #define reg_class_subclasses \ 707 (this_target_hard_regs->x_reg_class_subclasses) 708 #define reg_class_subunion \ 709 (this_target_hard_regs->x_reg_class_subunion) 710 #define reg_class_superunion \ 711 (this_target_hard_regs->x_reg_class_superunion) 712 #define reg_names \ 713 (this_target_hard_regs->x_reg_names) 714 715 /* Vector indexed by reg class giving its name. */ 716 717 extern const char * reg_class_names[]; 718 719 /* Given a hard REGN a FROM mode and a TO mode, return nonzero if 720 REGN cannot change modes between the specified modes. */ 721 #define REG_CANNOT_CHANGE_MODE_P(REGN, FROM, TO) \ 722 CANNOT_CHANGE_MODE_CLASS (FROM, TO, REGNO_REG_CLASS (REGN)) 723 724 #endif /* ! GCC_HARD_REG_SET_H */ 725
