gcc/hard-reg-set.h

   1 /* Sets (bit vectors) of hard registers, and operations on them.
   2    Copyright (C) 1987, 1992, 1994, 2000, 2003, 2004, 2005, 2007, 2008, 2009,
   3    2010, 2012 Free Software Foundation, Inc.
   4
   5 This file is part of GCC
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_HARD_REG_SET_H
  22 #define GCC_HARD_REG_SET_H
  23
  24 /* Define the type of a set of hard registers.  */
  25
  26 /* HARD_REG_ELT_TYPE is a typedef of the unsigned integral type which
  27    will be used for hard reg sets, either alone or in an array.
  28
  29    If HARD_REG_SET is a macro, its definition is HARD_REG_ELT_TYPE,
  30    and it has enough bits to represent all the target machine's hard
  31    registers.  Otherwise, it is a typedef for a suitably sized array
  32    of HARD_REG_ELT_TYPEs.  HARD_REG_SET_LONGS is defined as how many.
  33
  34    Note that lots of code assumes that the first part of a regset is
  35    the same format as a HARD_REG_SET.  To help make sure this is true,
  36    we only try the widest fast integer mode (HOST_WIDEST_FAST_INT)
  37    instead of all the smaller types.  This approach loses only if
  38    there are very few registers and then only in the few cases where
  39    we have an array of HARD_REG_SETs, so it needn't be as complex as
  40    it used to be.  */
  41
  42 typedef unsigned HOST_WIDEST_FAST_INT HARD_REG_ELT_TYPE;
  43
  44 #if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_WIDEST_FAST_INT
  45
  46 #define HARD_REG_SET HARD_REG_ELT_TYPE
  47
  48 #else
  49
  50 #define HARD_REG_SET_LONGS \
  51  ((FIRST_PSEUDO_REGISTER + HOST_BITS_PER_WIDEST_FAST_INT - 1)   \
  52   / HOST_BITS_PER_WIDEST_FAST_INT)
  53 typedef HARD_REG_ELT_TYPE HARD_REG_SET[HARD_REG_SET_LONGS];
  54
  55 #endif
  56
  57 /* HARD_REG_SET wrapped into a structure, to make it possible to
  58    use HARD_REG_SET even in APIs that should not include
  59    hard-reg-set.h.  */
  60 struct hard_reg_set_container
  61 {
  62   HARD_REG_SET set;
  63 };
  64
  65 /* HARD_CONST is used to cast a constant to the appropriate type
  66    for use with a HARD_REG_SET.  */
  67
  68 #define HARD_CONST(X) ((HARD_REG_ELT_TYPE) (X))
  69
  70 /* Define macros SET_HARD_REG_BIT, CLEAR_HARD_REG_BIT and TEST_HARD_REG_BIT
  71    to set, clear or test one bit in a hard reg set of type HARD_REG_SET.
  72    All three take two arguments: the set and the register number.
  73
  74    In the case where sets are arrays of longs, the first argument
  75    is actually a pointer to a long.
  76
  77    Define two macros for initializing a set:
  78    CLEAR_HARD_REG_SET and SET_HARD_REG_SET.
  79    These take just one argument.
  80
  81    Also define macros for copying hard reg sets:
  82    COPY_HARD_REG_SET and COMPL_HARD_REG_SET.
  83    These take two arguments TO and FROM; they read from FROM
  84    and store into TO.  COMPL_HARD_REG_SET complements each bit.
  85
  86    Also define macros for combining hard reg sets:
  87    IOR_HARD_REG_SET and AND_HARD_REG_SET.
  88    These take two arguments TO and FROM; they read from FROM
  89    and combine bitwise into TO.  Define also two variants
  90    IOR_COMPL_HARD_REG_SET and AND_COMPL_HARD_REG_SET
  91    which use the complement of the set FROM.
  92
  93    Also define:
  94
  95    hard_reg_set_subset_p (X, Y), which returns true if X is a subset of Y.
  96    hard_reg_set_equal_p (X, Y), which returns true if X and Y are equal.
  97    hard_reg_set_intersect_p (X, Y), which returns true if X and Y intersect.
  98    hard_reg_set_empty_p (X), which returns true if X is empty.  */
  99
 100 #define UHOST_BITS_PER_WIDE_INT ((unsigned) HOST_BITS_PER_WIDEST_FAST_INT)
 101
 102 #ifdef HARD_REG_SET
 103
 104 #define SET_HARD_REG_BIT(SET, BIT)  \
 105  ((SET) |= HARD_CONST (1) << (BIT))
 106 #define CLEAR_HARD_REG_BIT(SET, BIT)  \
 107  ((SET) &= ~(HARD_CONST (1) << (BIT)))
 108 #define TEST_HARD_REG_BIT(SET, BIT)  \
 109  (!!((SET) & (HARD_CONST (1) << (BIT))))
 110
 111 #define CLEAR_HARD_REG_SET(TO) ((TO) = HARD_CONST (0))
 112 #define SET_HARD_REG_SET(TO) ((TO) = ~ HARD_CONST (0))
 113
 114 #define COPY_HARD_REG_SET(TO, FROM) ((TO) = (FROM))
 115 #define COMPL_HARD_REG_SET(TO, FROM) ((TO) = ~(FROM))
 116
 117 #define IOR_HARD_REG_SET(TO, FROM) ((TO) |= (FROM))
 118 #define IOR_COMPL_HARD_REG_SET(TO, FROM) ((TO) |= ~ (FROM))
 119 #define AND_HARD_REG_SET(TO, FROM) ((TO) &= (FROM))
 120 #define AND_COMPL_HARD_REG_SET(TO, FROM) ((TO) &= ~ (FROM))
 121
 122 static inline bool
 123 hard_reg_set_subset_p (const HARD_REG_SET x, const HARD_REG_SET y)
 124 {
 125   return (x & ~y) == HARD_CONST (0);
 126 }
 127
 128 static inline bool
 129 hard_reg_set_equal_p (const HARD_REG_SET x, const HARD_REG_SET y)
 130 {
 131   return x == y;
 132 }
 133
 134 static inline bool
 135 hard_reg_set_intersect_p (const HARD_REG_SET x, const HARD_REG_SET y)
 136 {
 137   return (x & y) != HARD_CONST (0);
 138 }
 139
 140 static inline bool
 141 hard_reg_set_empty_p (const HARD_REG_SET x)
 142 {
 143   return x == HARD_CONST (0);
 144 }
 145
 146 #else
 147
 148 #define SET_HARD_REG_BIT(SET, BIT)              \
 149   ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT]       \
 150    |= HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))
 151
 152 #define CLEAR_HARD_REG_BIT(SET, BIT)            \
 153   ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT]       \
 154    &= ~(HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT)))
 155
 156 #define TEST_HARD_REG_BIT(SET, BIT)             \
 157   (!!((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT]    \
 158       & (HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))))
 159
 160 #if FIRST_PSEUDO_REGISTER <= 2*HOST_BITS_PER_WIDEST_FAST_INT
 161 #define CLEAR_HARD_REG_SET(TO)  \
 162 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO);                        \
 163      scan_tp_[0] = 0;                                           \
 164      scan_tp_[1] = 0; } while (0)
 165
 166 #define SET_HARD_REG_SET(TO)  \
 167 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO);                        \
 168      scan_tp_[0] = -1;                                          \
 169      scan_tp_[1] = -1; } while (0)
 170
 171 #define COPY_HARD_REG_SET(TO, FROM)  \
 172 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 173      scan_tp_[0] = scan_fp_[0];                                 \
 174      scan_tp_[1] = scan_fp_[1]; } while (0)
 175
 176 #define COMPL_HARD_REG_SET(TO, FROM)  \
 177 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 178      scan_tp_[0] = ~ scan_fp_[0];                               \
 179      scan_tp_[1] = ~ scan_fp_[1]; } while (0)
 180
 181 #define AND_HARD_REG_SET(TO, FROM)  \
 182 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 183      scan_tp_[0] &= scan_fp_[0];                                \
 184      scan_tp_[1] &= scan_fp_[1]; } while (0)
 185
 186 #define AND_COMPL_HARD_REG_SET(TO, FROM)  \
 187 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 188      scan_tp_[0] &= ~ scan_fp_[0];                              \
 189      scan_tp_[1] &= ~ scan_fp_[1]; } while (0)
 190
 191 #define IOR_HARD_REG_SET(TO, FROM)  \
 192 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 193      scan_tp_[0] |= scan_fp_[0];                                \
 194      scan_tp_[1] |= scan_fp_[1]; } while (0)
 195
 196 #define IOR_COMPL_HARD_REG_SET(TO, FROM)  \
 197 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 198      scan_tp_[0] |= ~ scan_fp_[0];                              \
 199      scan_tp_[1] |= ~ scan_fp_[1]; } while (0)
 200
 201 static inline bool
 202 hard_reg_set_subset_p (const HARD_REG_SET x, const HARD_REG_SET y)
 203 {
 204   return (x[0] & ~y[0]) == 0 && (x[1] & ~y[1]) == 0;
 205 }
 206
 207 static inline bool
 208 hard_reg_set_equal_p (const HARD_REG_SET x, const HARD_REG_SET y)
 209 {
 210   return x[0] == y[0] && x[1] == y[1];
 211 }
 212
 213 static inline bool
 214 hard_reg_set_intersect_p (const HARD_REG_SET x, const HARD_REG_SET y)
 215 {
 216   return (x[0] & y[0]) != 0 || (x[1] & y[1]) != 0;
 217 }
 218
 219 static inline bool
 220 hard_reg_set_empty_p (const HARD_REG_SET x)
 221 {
 222   return x[0] == 0 && x[1] == 0;
 223 }
 224
 225 #else
 226 #if FIRST_PSEUDO_REGISTER <= 3*HOST_BITS_PER_WIDEST_FAST_INT
 227 #define CLEAR_HARD_REG_SET(TO)  \
 228 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO);                        \
 229      scan_tp_[0] = 0;                                           \
 230      scan_tp_[1] = 0;                                           \
 231      scan_tp_[2] = 0; } while (0)
 232
 233 #define SET_HARD_REG_SET(TO)  \
 234 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO);                        \
 235      scan_tp_[0] = -1;                                          \
 236      scan_tp_[1] = -1;                                          \
 237      scan_tp_[2] = -1; } while (0)
 238
 239 #define COPY_HARD_REG_SET(TO, FROM)  \
 240 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 241      scan_tp_[0] = scan_fp_[0];                                 \
 242      scan_tp_[1] = scan_fp_[1];                                 \
 243      scan_tp_[2] = scan_fp_[2]; } while (0)
 244
 245 #define COMPL_HARD_REG_SET(TO, FROM)  \
 246 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 247      scan_tp_[0] = ~ scan_fp_[0];                               \
 248      scan_tp_[1] = ~ scan_fp_[1];                               \
 249      scan_tp_[2] = ~ scan_fp_[2]; } while (0)
 250
 251 #define AND_HARD_REG_SET(TO, FROM)  \
 252 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 253      scan_tp_[0] &= scan_fp_[0];                                \
 254      scan_tp_[1] &= scan_fp_[1];                                \
 255      scan_tp_[2] &= scan_fp_[2]; } while (0)
 256
 257 #define AND_COMPL_HARD_REG_SET(TO, FROM)  \
 258 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 259      scan_tp_[0] &= ~ scan_fp_[0];                              \
 260      scan_tp_[1] &= ~ scan_fp_[1];                              \
 261      scan_tp_[2] &= ~ scan_fp_[2]; } while (0)
 262
 263 #define IOR_HARD_REG_SET(TO, FROM)  \
 264 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 265      scan_tp_[0] |= scan_fp_[0];                                \
 266      scan_tp_[1] |= scan_fp_[1];                                \
 267      scan_tp_[2] |= scan_fp_[2]; } while (0)
 268
 269 #define IOR_COMPL_HARD_REG_SET(TO, FROM)  \
 270 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 271      scan_tp_[0] |= ~ scan_fp_[0];                              \
 272      scan_tp_[1] |= ~ scan_fp_[1];                              \
 273      scan_tp_[2] |= ~ scan_fp_[2]; } while (0)
 274
 275 static inline bool
 276 hard_reg_set_subset_p (const HARD_REG_SET x, const HARD_REG_SET y)
 277 {
 278   return ((x[0] & ~y[0]) == 0
 279           && (x[1] & ~y[1]) == 0
 280           && (x[2] & ~y[2]) == 0);
 281 }
 282
 283 static inline bool
 284 hard_reg_set_equal_p (const HARD_REG_SET x, const HARD_REG_SET y)
 285 {
 286   return x[0] == y[0] && x[1] == y[1] && x[2] == y[2];
 287 }
 288
 289 static inline bool
 290 hard_reg_set_intersect_p (const HARD_REG_SET x, const HARD_REG_SET y)
 291 {
 292   return ((x[0] & y[0]) != 0
 293           || (x[1] & y[1]) != 0
 294           || (x[2] & y[2]) != 0);
 295 }
 296
 297 static inline bool
 298 hard_reg_set_empty_p (const HARD_REG_SET x)
 299 {
 300   return x[0] == 0 && x[1] == 0 && x[2] == 0;
 301 }
 302
 303 #else
 304 #if FIRST_PSEUDO_REGISTER <= 4*HOST_BITS_PER_WIDEST_FAST_INT
 305 #define CLEAR_HARD_REG_SET(TO)  \
 306 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO);                        \
 307      scan_tp_[0] = 0;                                           \
 308      scan_tp_[1] = 0;                                           \
 309      scan_tp_[2] = 0;                                           \
 310      scan_tp_[3] = 0; } while (0)
 311
 312 #define SET_HARD_REG_SET(TO)  \
 313 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO);                        \
 314      scan_tp_[0] = -1;                                          \
 315      scan_tp_[1] = -1;                                          \
 316      scan_tp_[2] = -1;                                          \
 317      scan_tp_[3] = -1; } while (0)
 318
 319 #define COPY_HARD_REG_SET(TO, FROM)  \
 320 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 321      scan_tp_[0] = scan_fp_[0];                                 \
 322      scan_tp_[1] = scan_fp_[1];                                 \
 323      scan_tp_[2] = scan_fp_[2];                                 \
 324      scan_tp_[3] = scan_fp_[3]; } while (0)
 325
 326 #define COMPL_HARD_REG_SET(TO, FROM)  \
 327 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 328      scan_tp_[0] = ~ scan_fp_[0];                               \
 329      scan_tp_[1] = ~ scan_fp_[1];                               \
 330      scan_tp_[2] = ~ scan_fp_[2];                               \
 331      scan_tp_[3] = ~ scan_fp_[3]; } while (0)
 332
 333 #define AND_HARD_REG_SET(TO, FROM)  \
 334 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 335      scan_tp_[0] &= scan_fp_[0];                                \
 336      scan_tp_[1] &= scan_fp_[1];                                \
 337      scan_tp_[2] &= scan_fp_[2];                                \
 338      scan_tp_[3] &= scan_fp_[3]; } while (0)
 339
 340 #define AND_COMPL_HARD_REG_SET(TO, FROM)  \
 341 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 342      scan_tp_[0] &= ~ scan_fp_[0];                              \
 343      scan_tp_[1] &= ~ scan_fp_[1];                              \
 344      scan_tp_[2] &= ~ scan_fp_[2];                              \
 345      scan_tp_[3] &= ~ scan_fp_[3]; } while (0)
 346
 347 #define IOR_HARD_REG_SET(TO, FROM)  \
 348 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 349      scan_tp_[0] |= scan_fp_[0];                                \
 350      scan_tp_[1] |= scan_fp_[1];                                \
 351      scan_tp_[2] |= scan_fp_[2];                                \
 352      scan_tp_[3] |= scan_fp_[3]; } while (0)
 353
 354 #define IOR_COMPL_HARD_REG_SET(TO, FROM)  \
 355 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 356      scan_tp_[0] |= ~ scan_fp_[0];                              \
 357      scan_tp_[1] |= ~ scan_fp_[1];                              \
 358      scan_tp_[2] |= ~ scan_fp_[2];                              \
 359      scan_tp_[3] |= ~ scan_fp_[3]; } while (0)
 360
 361 static inline bool
 362 hard_reg_set_subset_p (const HARD_REG_SET x, const HARD_REG_SET y)
 363 {
 364   return ((x[0] & ~y[0]) == 0
 365           && (x[1] & ~y[1]) == 0
 366           && (x[2] & ~y[2]) == 0
 367           && (x[3] & ~y[3]) == 0);
 368 }
 369
 370 static inline bool
 371 hard_reg_set_equal_p (const HARD_REG_SET x, const HARD_REG_SET y)
 372 {
 373   return x[0] == y[0] && x[1] == y[1] && x[2] == y[2] && x[3] == y[3];
 374 }
 375
 376 static inline bool
 377 hard_reg_set_intersect_p (const HARD_REG_SET x, const HARD_REG_SET y)
 378 {
 379   return ((x[0] & y[0]) != 0
 380           || (x[1] & y[1]) != 0
 381           || (x[2] & y[2]) != 0
 382           || (x[3] & y[3]) != 0);
 383 }
 384
 385 static inline bool
 386 hard_reg_set_empty_p (const HARD_REG_SET x)
 387 {
 388   return x[0] == 0 && x[1] == 0 && x[2] == 0 && x[3] == 0;
 389 }
 390
 391 #else /* FIRST_PSEUDO_REGISTER > 4*HOST_BITS_PER_WIDEST_FAST_INT */
 392
 393 #define CLEAR_HARD_REG_SET(TO)  \
 394 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO);                        \
 395      int i;                                                     \
 396      for (i = 0; i < HARD_REG_SET_LONGS; i++)                   \
 397        *scan_tp_++ = 0; } while (0)
 398
 399 #define SET_HARD_REG_SET(TO)  \
 400 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO);                        \
 401      int i;                                                     \
 402      for (i = 0; i < HARD_REG_SET_LONGS; i++)                   \
 403        *scan_tp_++ = -1; } while (0)
 404
 405 #define COPY_HARD_REG_SET(TO, FROM)  \
 406 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 407      int i;                                                     \
 408      for (i = 0; i < HARD_REG_SET_LONGS; i++)                   \
 409        *scan_tp_++ = *scan_fp_++; } while (0)
 410
 411 #define COMPL_HARD_REG_SET(TO, FROM)  \
 412 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 413      int i;                                                     \
 414      for (i = 0; i < HARD_REG_SET_LONGS; i++)                   \
 415        *scan_tp_++ = ~ *scan_fp_++; } while (0)
 416
 417 #define AND_HARD_REG_SET(TO, FROM)  \
 418 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 419      int i;                                                     \
 420      for (i = 0; i < HARD_REG_SET_LONGS; i++)                   \
 421        *scan_tp_++ &= *scan_fp_++; } while (0)
 422
 423 #define AND_COMPL_HARD_REG_SET(TO, FROM)  \
 424 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 425      int i;                                                     \
 426      for (i = 0; i < HARD_REG_SET_LONGS; i++)                   \
 427        *scan_tp_++ &= ~ *scan_fp_++; } while (0)
 428
 429 #define IOR_HARD_REG_SET(TO, FROM)  \
 430 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 431      int i;                                                     \
 432      for (i = 0; i < HARD_REG_SET_LONGS; i++)                   \
 433        *scan_tp_++ |= *scan_fp_++; } while (0)
 434
 435 #define IOR_COMPL_HARD_REG_SET(TO, FROM)  \
 436 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM);    \
 437      int i;                                                     \
 438      for (i = 0; i < HARD_REG_SET_LONGS; i++)                   \
 439        *scan_tp_++ |= ~ *scan_fp_++; } while (0)
 440
 441 static inline bool
 442 hard_reg_set_subset_p (const HARD_REG_SET x, const HARD_REG_SET y)
 443 {
 444   int i;
 445
 446   for (i = 0; i < HARD_REG_SET_LONGS; i++)
 447     if ((x[i] & ~y[i]) != 0)
 448       return false;
 449   return true;
 450 }
 451
 452 static inline bool
 453 hard_reg_set_equal_p (const HARD_REG_SET x, const HARD_REG_SET y)
 454 {
 455   int i;
 456
 457   for (i = 0; i < HARD_REG_SET_LONGS; i++)
 458     if (x[i] != y[i])
 459       return false;
 460   return true;
 461 }
 462
 463 static inline bool
 464 hard_reg_set_intersect_p (const HARD_REG_SET x, const HARD_REG_SET y)
 465 {
 466   int i;
 467
 468   for (i = 0; i < HARD_REG_SET_LONGS; i++)
 469     if ((x[i] & y[i]) != 0)
 470       return true;
 471   return false;
 472 }
 473
 474 static inline bool
 475 hard_reg_set_empty_p (const HARD_REG_SET x)
 476 {
 477   int i;
 478
 479   for (i = 0; i < HARD_REG_SET_LONGS; i++)
 480     if (x[i] != 0)
 481       return false;
 482   return true;
 483 }
 484
 485 #endif
 486 #endif
 487 #endif
 488 #endif
 489
 490 /* Iterator for hard register sets.  */
 491
 492 typedef struct
 493 {
 494   /* Pointer to the current element.  */
 495   HARD_REG_ELT_TYPE *pelt;
 496
 497   /* The length of the set.  */
 498   unsigned short length;
 499
 500   /* Word within the current element.  */
 501   unsigned short word_no;
 502
 503   /* Contents of the actually processed word.  When finding next bit
 504      it is shifted right, so that the actual bit is always the least
 505      significant bit of ACTUAL.  */
 506   HARD_REG_ELT_TYPE bits;
 507 } hard_reg_set_iterator;
 508
 509 #define HARD_REG_ELT_BITS UHOST_BITS_PER_WIDE_INT
 510
 511 /* The implementation of the iterator functions is fully analogous to
 512    the bitmap iterators.  */
 513 static inline void
 514 hard_reg_set_iter_init (hard_reg_set_iterator *iter, HARD_REG_SET set,
 515                         unsigned min, unsigned *regno)
 516 {
 517 #ifdef HARD_REG_SET_LONGS
 518   iter->pelt = set;
 519   iter->length = HARD_REG_SET_LONGS;
 520 #else
 521   iter->pelt = &set;
 522   iter->length = 1;
 523 #endif
 524   iter->word_no = min / HARD_REG_ELT_BITS;
 525   if (iter->word_no < iter->length)
 526     {
 527       iter->bits = iter->pelt[iter->word_no];
 528       iter->bits >>= min % HARD_REG_ELT_BITS;
 529
 530       /* This is required for correct search of the next bit.  */
 531       min += !iter->bits;
 532     }
 533   *regno = min;
 534 }
 535
 536 static inline bool
 537 hard_reg_set_iter_set (hard_reg_set_iterator *iter, unsigned *regno)
 538 {
 539   while (1)
 540     {
 541       /* Return false when we're advanced past the end of the set.  */
 542       if (iter->word_no >= iter->length)
 543         return false;
 544
 545       if (iter->bits)
 546         {
 547           /* Find the correct bit and return it.  */
 548           while (!(iter->bits & 1))
 549             {
 550               iter->bits >>= 1;
 551               *regno += 1;
 552             }
 553           return (*regno < FIRST_PSEUDO_REGISTER);
 554         }
 555
 556       /* Round to the beginning of the next word.  */
 557       *regno = (*regno + HARD_REG_ELT_BITS - 1);
 558       *regno -= *regno % HARD_REG_ELT_BITS;
 559
 560       /* Find the next non-zero word.  */
 561       while (++iter->word_no < iter->length)
 562         {
 563           iter->bits = iter->pelt[iter->word_no];
 564           if (iter->bits)
 565             break;
 566           *regno += HARD_REG_ELT_BITS;
 567         }
 568     }
 569 }
 570
 571 static inline void
 572 hard_reg_set_iter_next (hard_reg_set_iterator *iter, unsigned *regno)
 573 {
 574   iter->bits >>= 1;
 575   *regno += 1;
 576 }
 577
 578 #define EXECUTE_IF_SET_IN_HARD_REG_SET(SET, MIN, REGNUM, ITER)          \
 579   for (hard_reg_set_iter_init (&(ITER), (SET), (MIN), &(REGNUM));       \
 580        hard_reg_set_iter_set (&(ITER), &(REGNUM));                      \
 581        hard_reg_set_iter_next (&(ITER), &(REGNUM)))
 582
 583
 584 /* Define some standard sets of registers.  */
 585
 586 /* Indexed by hard register number, contains 1 for registers
 587    that are being used for global register decls.
 588    These must be exempt from ordinary flow analysis
 589    and are also considered fixed.  */
 590
 591 extern char global_regs[FIRST_PSEUDO_REGISTER];
 592
 593 struct target_hard_regs {
 594   /* The set of registers that actually exist on the current target.  */
 595   HARD_REG_SET x_accessible_reg_set;
 596
 597   /* The set of registers that should be considered to be register
 598      operands.  It is a subset of x_accessible_reg_set.  */
 599   HARD_REG_SET x_operand_reg_set;
 600
 601   /* Indexed by hard register number, contains 1 for registers
 602      that are fixed use (stack pointer, pc, frame pointer, etc.;.
 603      These are the registers that cannot be used to allocate
 604      a pseudo reg whose life does not cross calls.  */
 605   char x_fixed_regs[FIRST_PSEUDO_REGISTER];
 606
 607   /* The same info as a HARD_REG_SET.  */
 608   HARD_REG_SET x_fixed_reg_set;
 609
 610   /* Indexed by hard register number, contains 1 for registers
 611      that are fixed use or are clobbered by function calls.
 612      These are the registers that cannot be used to allocate
 613      a pseudo reg whose life crosses calls.  */
 614   char x_call_used_regs[FIRST_PSEUDO_REGISTER];
 615
 616   char x_call_really_used_regs[FIRST_PSEUDO_REGISTER];
 617
 618   /* The same info as a HARD_REG_SET.  */
 619   HARD_REG_SET x_call_used_reg_set;
 620
 621   /* Contains registers that are fixed use -- i.e. in fixed_reg_set -- or
 622      a function value return register or TARGET_STRUCT_VALUE_RTX or
 623      STATIC_CHAIN_REGNUM.  These are the registers that cannot hold quantities
 624      across calls even if we are willing to save and restore them.  */
 625   HARD_REG_SET x_call_fixed_reg_set;
 626
 627   /* Contains 1 for registers that are set or clobbered by calls.  */
 628   /* ??? Ideally, this would be just call_used_regs plus global_regs, but
 629      for someone's bright idea to have call_used_regs strictly include
 630      fixed_regs.  Which leaves us guessing as to the set of fixed_regs
 631      that are actually preserved.  We know for sure that those associated
 632      with the local stack frame are safe, but scant others.  */
 633   HARD_REG_SET x_regs_invalidated_by_call;
 634
 635   /* Call used hard registers which can not be saved because there is no
 636      insn for this.  */
 637   HARD_REG_SET x_no_caller_save_reg_set;
 638
 639   /* Table of register numbers in the order in which to try to use them.  */
 640   int x_reg_alloc_order[FIRST_PSEUDO_REGISTER];
 641
 642   /* The inverse of reg_alloc_order.  */
 643   int x_inv_reg_alloc_order[FIRST_PSEUDO_REGISTER];
 644
 645   /* For each reg class, a HARD_REG_SET saying which registers are in it.  */
 646   HARD_REG_SET x_reg_class_contents[N_REG_CLASSES];
 647
 648   /* For each reg class, a boolean saying whether the class contains only
 649      fixed registers.  */
 650   bool x_class_only_fixed_regs[N_REG_CLASSES];
 651
 652   /* For each reg class, number of regs it contains.  */
 653   unsigned int x_reg_class_size[N_REG_CLASSES];
 654
 655   /* For each reg class, table listing all the classes contained in it.  */
 656   enum reg_class x_reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES];
 657
 658   /* For each pair of reg classes,
 659      a largest reg class contained in their union.  */
 660   enum reg_class x_reg_class_subunion[N_REG_CLASSES][N_REG_CLASSES];
 661
 662   /* For each pair of reg classes,
 663      the smallest reg class that contains their union.  */
 664   enum reg_class x_reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES];
 665
 666   /* Vector indexed by hardware reg giving its name.  */
 667   const char *x_reg_names[FIRST_PSEUDO_REGISTER];
 668 };
 669
 670 extern struct target_hard_regs default_target_hard_regs;
 671 #if SWITCHABLE_TARGET
 672 extern struct target_hard_regs *this_target_hard_regs;
 673 #else
 674 #define this_target_hard_regs (&default_target_hard_regs)
 675 #endif
 676
 677 #define accessible_reg_set \
 678   (this_target_hard_regs->x_accessible_reg_set)
 679 #define operand_reg_set \
 680   (this_target_hard_regs->x_operand_reg_set)
 681 #define fixed_regs \
 682   (this_target_hard_regs->x_fixed_regs)
 683 #define fixed_reg_set \
 684   (this_target_hard_regs->x_fixed_reg_set)
 685 #define call_used_regs \
 686   (this_target_hard_regs->x_call_used_regs)
 687 #define call_really_used_regs \
 688   (this_target_hard_regs->x_call_really_used_regs)
 689 #define call_used_reg_set \
 690   (this_target_hard_regs->x_call_used_reg_set)
 691 #define call_fixed_reg_set \
 692   (this_target_hard_regs->x_call_fixed_reg_set)
 693 #define regs_invalidated_by_call \
 694   (this_target_hard_regs->x_regs_invalidated_by_call)
 695 #define no_caller_save_reg_set \
 696   (this_target_hard_regs->x_no_caller_save_reg_set)
 697 #define reg_alloc_order \
 698   (this_target_hard_regs->x_reg_alloc_order)
 699 #define inv_reg_alloc_order \
 700   (this_target_hard_regs->x_inv_reg_alloc_order)
 701 #define reg_class_contents \
 702   (this_target_hard_regs->x_reg_class_contents)
 703 #define class_only_fixed_regs \
 704   (this_target_hard_regs->x_class_only_fixed_regs)
 705 #define reg_class_size \
 706   (this_target_hard_regs->x_reg_class_size)
 707 #define reg_class_subclasses \
 708   (this_target_hard_regs->x_reg_class_subclasses)
 709 #define reg_class_subunion \
 710   (this_target_hard_regs->x_reg_class_subunion)
 711 #define reg_class_superunion \
 712   (this_target_hard_regs->x_reg_class_superunion)
 713 #define reg_names \
 714   (this_target_hard_regs->x_reg_names)
 715
 716 /* Vector indexed by reg class giving its name.  */
 717
 718 extern const char * reg_class_names[];
 719
 720 /* Given a hard REGN a FROM mode and a TO mode, return nonzero if
 721    REGN cannot change modes between the specified modes.  */
 722 #define REG_CANNOT_CHANGE_MODE_P(REGN, FROM, TO)                          \
 723          CANNOT_CHANGE_MODE_CLASS (FROM, TO, REGNO_REG_CLASS (REGN))
 724
 725 #endif /* ! GCC_HARD_REG_SET_H */