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[official-gcc.git] / gcc / hard-reg-set.h
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1 /* Sets (bit vectors) of hard registers, and operations on them.
2 Copyright (C) 1987, 1992, 1994, 2000, 2003, 2004, 2005
3 Free Software Foundation, Inc.
5 This file is part of GCC
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 2, or (at your option) any later
10 version.
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.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
20 02111-1307, USA. */
22 #ifndef GCC_HARD_REG_SET_H
23 #define GCC_HARD_REG_SET_H
25 /* Define the type of a set of hard registers. */
27 /* HARD_REG_ELT_TYPE is a typedef of the unsigned integral type which
28 will be used for hard reg sets, either alone or in an array.
30 If HARD_REG_SET is a macro, its definition is HARD_REG_ELT_TYPE,
31 and it has enough bits to represent all the target machine's hard
32 registers. Otherwise, it is a typedef for a suitably sized array
33 of HARD_REG_ELT_TYPEs. HARD_REG_SET_LONGS is defined as how many.
35 Note that lots of code assumes that the first part of a regset is
36 the same format as a HARD_REG_SET. To help make sure this is true,
37 we only try the widest fast integer mode (HOST_WIDEST_FAST_INT)
38 instead of all the smaller types. This approach loses only if
39 there are very few registers and then only in the few cases where
40 we have an array of HARD_REG_SETs, so it needn't be as complex as
41 it used to be. */
43 typedef unsigned HOST_WIDEST_FAST_INT HARD_REG_ELT_TYPE;
45 #if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_WIDEST_FAST_INT
47 #define HARD_REG_SET HARD_REG_ELT_TYPE
49 #else
51 #define HARD_REG_SET_LONGS \
52 ((FIRST_PSEUDO_REGISTER + HOST_BITS_PER_WIDEST_FAST_INT - 1) \
53 / HOST_BITS_PER_WIDEST_FAST_INT)
54 typedef HARD_REG_ELT_TYPE HARD_REG_SET[HARD_REG_SET_LONGS];
56 #endif
58 /* HARD_CONST is used to cast a constant to the appropriate type
59 for use with a HARD_REG_SET. */
61 #define HARD_CONST(X) ((HARD_REG_ELT_TYPE) (X))
63 /* Define macros SET_HARD_REG_BIT, CLEAR_HARD_REG_BIT and TEST_HARD_REG_BIT
64 to set, clear or test one bit in a hard reg set of type HARD_REG_SET.
65 All three take two arguments: the set and the register number.
67 In the case where sets are arrays of longs, the first argument
68 is actually a pointer to a long.
70 Define two macros for initializing a set:
71 CLEAR_HARD_REG_SET and SET_HARD_REG_SET.
72 These take just one argument.
74 Also define macros for copying hard reg sets:
75 COPY_HARD_REG_SET and COMPL_HARD_REG_SET.
76 These take two arguments TO and FROM; they read from FROM
77 and store into TO. COMPL_HARD_REG_SET complements each bit.
79 Also define macros for combining hard reg sets:
80 IOR_HARD_REG_SET and AND_HARD_REG_SET.
81 These take two arguments TO and FROM; they read from FROM
82 and combine bitwise into TO. Define also two variants
83 IOR_COMPL_HARD_REG_SET and AND_COMPL_HARD_REG_SET
84 which use the complement of the set FROM.
86 Also define GO_IF_HARD_REG_SUBSET (X, Y, TO):
87 if X is a subset of Y, go to TO.
90 #ifdef HARD_REG_SET
92 #define SET_HARD_REG_BIT(SET, BIT) \
93 ((SET) |= HARD_CONST (1) << (BIT))
94 #define CLEAR_HARD_REG_BIT(SET, BIT) \
95 ((SET) &= ~(HARD_CONST (1) << (BIT)))
96 #define TEST_HARD_REG_BIT(SET, BIT) \
97 (!!((SET) & (HARD_CONST (1) << (BIT))))
99 #define CLEAR_HARD_REG_SET(TO) ((TO) = HARD_CONST (0))
100 #define SET_HARD_REG_SET(TO) ((TO) = ~ HARD_CONST (0))
102 #define COPY_HARD_REG_SET(TO, FROM) ((TO) = (FROM))
103 #define COMPL_HARD_REG_SET(TO, FROM) ((TO) = ~(FROM))
105 #define IOR_HARD_REG_SET(TO, FROM) ((TO) |= (FROM))
106 #define IOR_COMPL_HARD_REG_SET(TO, FROM) ((TO) |= ~ (FROM))
107 #define AND_HARD_REG_SET(TO, FROM) ((TO) &= (FROM))
108 #define AND_COMPL_HARD_REG_SET(TO, FROM) ((TO) &= ~ (FROM))
110 #define GO_IF_HARD_REG_SUBSET(X,Y,TO) if (HARD_CONST (0) == ((X) & ~(Y))) goto TO
112 #define GO_IF_HARD_REG_EQUAL(X,Y,TO) if ((X) == (Y)) goto TO
114 #else
116 #define UHOST_BITS_PER_WIDE_INT ((unsigned) HOST_BITS_PER_WIDEST_FAST_INT)
118 #define SET_HARD_REG_BIT(SET, BIT) \
119 ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \
120 |= HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))
122 #define CLEAR_HARD_REG_BIT(SET, BIT) \
123 ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \
124 &= ~(HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT)))
126 #define TEST_HARD_REG_BIT(SET, BIT) \
127 (!!((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \
128 & (HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))))
130 #if FIRST_PSEUDO_REGISTER <= 2*HOST_BITS_PER_WIDEST_FAST_INT
131 #define CLEAR_HARD_REG_SET(TO) \
132 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
133 scan_tp_[0] = 0; \
134 scan_tp_[1] = 0; } while (0)
136 #define SET_HARD_REG_SET(TO) \
137 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
138 scan_tp_[0] = -1; \
139 scan_tp_[1] = -1; } while (0)
141 #define COPY_HARD_REG_SET(TO, FROM) \
142 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
143 scan_tp_[0] = scan_fp_[0]; \
144 scan_tp_[1] = scan_fp_[1]; } while (0)
146 #define COMPL_HARD_REG_SET(TO, FROM) \
147 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
148 scan_tp_[0] = ~ scan_fp_[0]; \
149 scan_tp_[1] = ~ scan_fp_[1]; } while (0)
151 #define AND_HARD_REG_SET(TO, FROM) \
152 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
153 scan_tp_[0] &= scan_fp_[0]; \
154 scan_tp_[1] &= scan_fp_[1]; } while (0)
156 #define AND_COMPL_HARD_REG_SET(TO, FROM) \
157 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
158 scan_tp_[0] &= ~ scan_fp_[0]; \
159 scan_tp_[1] &= ~ scan_fp_[1]; } while (0)
161 #define IOR_HARD_REG_SET(TO, FROM) \
162 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
163 scan_tp_[0] |= scan_fp_[0]; \
164 scan_tp_[1] |= scan_fp_[1]; } while (0)
166 #define IOR_COMPL_HARD_REG_SET(TO, FROM) \
167 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
168 scan_tp_[0] |= ~ scan_fp_[0]; \
169 scan_tp_[1] |= ~ scan_fp_[1]; } while (0)
171 #define GO_IF_HARD_REG_SUBSET(X,Y,TO) \
172 do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
173 if ((0 == (scan_xp_[0] & ~ scan_yp_[0])) \
174 && (0 == (scan_xp_[1] & ~ scan_yp_[1]))) \
175 goto TO; } while (0)
177 #define GO_IF_HARD_REG_EQUAL(X,Y,TO) \
178 do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
179 if ((scan_xp_[0] == scan_yp_[0]) \
180 && (scan_xp_[1] == scan_yp_[1])) \
181 goto TO; } while (0)
183 #else
184 #if FIRST_PSEUDO_REGISTER <= 3*HOST_BITS_PER_WIDEST_FAST_INT
185 #define CLEAR_HARD_REG_SET(TO) \
186 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
187 scan_tp_[0] = 0; \
188 scan_tp_[1] = 0; \
189 scan_tp_[2] = 0; } while (0)
191 #define SET_HARD_REG_SET(TO) \
192 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
193 scan_tp_[0] = -1; \
194 scan_tp_[1] = -1; \
195 scan_tp_[2] = -1; } while (0)
197 #define COPY_HARD_REG_SET(TO, FROM) \
198 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
199 scan_tp_[0] = scan_fp_[0]; \
200 scan_tp_[1] = scan_fp_[1]; \
201 scan_tp_[2] = scan_fp_[2]; } while (0)
203 #define COMPL_HARD_REG_SET(TO, FROM) \
204 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
205 scan_tp_[0] = ~ scan_fp_[0]; \
206 scan_tp_[1] = ~ scan_fp_[1]; \
207 scan_tp_[2] = ~ scan_fp_[2]; } while (0)
209 #define AND_HARD_REG_SET(TO, FROM) \
210 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
211 scan_tp_[0] &= scan_fp_[0]; \
212 scan_tp_[1] &= scan_fp_[1]; \
213 scan_tp_[2] &= scan_fp_[2]; } while (0)
215 #define AND_COMPL_HARD_REG_SET(TO, FROM) \
216 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
217 scan_tp_[0] &= ~ scan_fp_[0]; \
218 scan_tp_[1] &= ~ scan_fp_[1]; \
219 scan_tp_[2] &= ~ scan_fp_[2]; } while (0)
221 #define IOR_HARD_REG_SET(TO, FROM) \
222 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
223 scan_tp_[0] |= scan_fp_[0]; \
224 scan_tp_[1] |= scan_fp_[1]; \
225 scan_tp_[2] |= scan_fp_[2]; } while (0)
227 #define IOR_COMPL_HARD_REG_SET(TO, FROM) \
228 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
229 scan_tp_[0] |= ~ scan_fp_[0]; \
230 scan_tp_[1] |= ~ scan_fp_[1]; \
231 scan_tp_[2] |= ~ scan_fp_[2]; } while (0)
233 #define GO_IF_HARD_REG_SUBSET(X,Y,TO) \
234 do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
235 if ((0 == (scan_xp_[0] & ~ scan_yp_[0])) \
236 && (0 == (scan_xp_[1] & ~ scan_yp_[1])) \
237 && (0 == (scan_xp_[2] & ~ scan_yp_[2]))) \
238 goto TO; } while (0)
240 #define GO_IF_HARD_REG_EQUAL(X,Y,TO) \
241 do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
242 if ((scan_xp_[0] == scan_yp_[0]) \
243 && (scan_xp_[1] == scan_yp_[1]) \
244 && (scan_xp_[2] == scan_yp_[2])) \
245 goto TO; } while (0)
247 #else
248 #if FIRST_PSEUDO_REGISTER <= 4*HOST_BITS_PER_WIDEST_FAST_INT
249 #define CLEAR_HARD_REG_SET(TO) \
250 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
251 scan_tp_[0] = 0; \
252 scan_tp_[1] = 0; \
253 scan_tp_[2] = 0; \
254 scan_tp_[3] = 0; } while (0)
256 #define SET_HARD_REG_SET(TO) \
257 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
258 scan_tp_[0] = -1; \
259 scan_tp_[1] = -1; \
260 scan_tp_[2] = -1; \
261 scan_tp_[3] = -1; } while (0)
263 #define COPY_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]; \
268 scan_tp_[3] = scan_fp_[3]; } while (0)
270 #define COMPL_HARD_REG_SET(TO, FROM) \
271 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
272 scan_tp_[0] = ~ scan_fp_[0]; \
273 scan_tp_[1] = ~ scan_fp_[1]; \
274 scan_tp_[2] = ~ scan_fp_[2]; \
275 scan_tp_[3] = ~ scan_fp_[3]; } while (0)
277 #define AND_HARD_REG_SET(TO, FROM) \
278 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
279 scan_tp_[0] &= scan_fp_[0]; \
280 scan_tp_[1] &= scan_fp_[1]; \
281 scan_tp_[2] &= scan_fp_[2]; \
282 scan_tp_[3] &= scan_fp_[3]; } while (0)
284 #define AND_COMPL_HARD_REG_SET(TO, FROM) \
285 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
286 scan_tp_[0] &= ~ scan_fp_[0]; \
287 scan_tp_[1] &= ~ scan_fp_[1]; \
288 scan_tp_[2] &= ~ scan_fp_[2]; \
289 scan_tp_[3] &= ~ scan_fp_[3]; } while (0)
291 #define IOR_HARD_REG_SET(TO, FROM) \
292 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
293 scan_tp_[0] |= scan_fp_[0]; \
294 scan_tp_[1] |= scan_fp_[1]; \
295 scan_tp_[2] |= scan_fp_[2]; \
296 scan_tp_[3] |= scan_fp_[3]; } while (0)
298 #define IOR_COMPL_HARD_REG_SET(TO, FROM) \
299 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
300 scan_tp_[0] |= ~ scan_fp_[0]; \
301 scan_tp_[1] |= ~ scan_fp_[1]; \
302 scan_tp_[2] |= ~ scan_fp_[2]; \
303 scan_tp_[3] |= ~ scan_fp_[3]; } while (0)
305 #define GO_IF_HARD_REG_SUBSET(X,Y,TO) \
306 do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
307 if ((0 == (scan_xp_[0] & ~ scan_yp_[0])) \
308 && (0 == (scan_xp_[1] & ~ scan_yp_[1])) \
309 && (0 == (scan_xp_[2] & ~ scan_yp_[2])) \
310 && (0 == (scan_xp_[3] & ~ scan_yp_[3]))) \
311 goto TO; } while (0)
313 #define GO_IF_HARD_REG_EQUAL(X,Y,TO) \
314 do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
315 if ((scan_xp_[0] == scan_yp_[0]) \
316 && (scan_xp_[1] == scan_yp_[1]) \
317 && (scan_xp_[2] == scan_yp_[2]) \
318 && (scan_xp_[3] == scan_yp_[3])) \
319 goto TO; } while (0)
321 #else /* FIRST_PSEUDO_REGISTER > 3*HOST_BITS_PER_WIDEST_FAST_INT */
323 #define CLEAR_HARD_REG_SET(TO) \
324 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
325 int i; \
326 for (i = 0; i < HARD_REG_SET_LONGS; i++) \
327 *scan_tp_++ = 0; } while (0)
329 #define SET_HARD_REG_SET(TO) \
330 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO); \
331 int i; \
332 for (i = 0; i < HARD_REG_SET_LONGS; i++) \
333 *scan_tp_++ = -1; } while (0)
335 #define COPY_HARD_REG_SET(TO, FROM) \
336 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
337 int i; \
338 for (i = 0; i < HARD_REG_SET_LONGS; i++) \
339 *scan_tp_++ = *scan_fp_++; } while (0)
341 #define COMPL_HARD_REG_SET(TO, FROM) \
342 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
343 int i; \
344 for (i = 0; i < HARD_REG_SET_LONGS; i++) \
345 *scan_tp_++ = ~ *scan_fp_++; } while (0)
347 #define AND_HARD_REG_SET(TO, FROM) \
348 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
349 int i; \
350 for (i = 0; i < HARD_REG_SET_LONGS; i++) \
351 *scan_tp_++ &= *scan_fp_++; } while (0)
353 #define AND_COMPL_HARD_REG_SET(TO, FROM) \
354 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
355 int i; \
356 for (i = 0; i < HARD_REG_SET_LONGS; i++) \
357 *scan_tp_++ &= ~ *scan_fp_++; } while (0)
359 #define IOR_HARD_REG_SET(TO, FROM) \
360 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
361 int i; \
362 for (i = 0; i < HARD_REG_SET_LONGS; i++) \
363 *scan_tp_++ |= *scan_fp_++; } while (0)
365 #define IOR_COMPL_HARD_REG_SET(TO, FROM) \
366 do { HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \
367 int i; \
368 for (i = 0; i < HARD_REG_SET_LONGS; i++) \
369 *scan_tp_++ |= ~ *scan_fp_++; } while (0)
371 #define GO_IF_HARD_REG_SUBSET(X,Y,TO) \
372 do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
373 int i; \
374 for (i = 0; i < HARD_REG_SET_LONGS; i++) \
375 if (0 != (*scan_xp_++ & ~ *scan_yp_++)) break; \
376 if (i == HARD_REG_SET_LONGS) goto TO; } while (0)
378 #define GO_IF_HARD_REG_EQUAL(X,Y,TO) \
379 do { HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \
380 int i; \
381 for (i = 0; i < HARD_REG_SET_LONGS; i++) \
382 if (*scan_xp_++ != *scan_yp_++) break; \
383 if (i == HARD_REG_SET_LONGS) goto TO; } while (0)
385 #endif
386 #endif
387 #endif
388 #endif
390 /* Define some standard sets of registers. */
392 /* Indexed by hard register number, contains 1 for registers
393 that are fixed use (stack pointer, pc, frame pointer, etc.).
394 These are the registers that cannot be used to allocate
395 a pseudo reg whose life does not cross calls. */
397 extern char fixed_regs[FIRST_PSEUDO_REGISTER];
399 /* The same info as a HARD_REG_SET. */
401 extern HARD_REG_SET fixed_reg_set;
403 /* Indexed by hard register number, contains 1 for registers
404 that are fixed use or are clobbered by function calls.
405 These are the registers that cannot be used to allocate
406 a pseudo reg whose life crosses calls. */
408 extern char call_used_regs[FIRST_PSEUDO_REGISTER];
410 #ifdef CALL_REALLY_USED_REGISTERS
411 extern char call_really_used_regs[];
412 #endif
414 /* The same info as a HARD_REG_SET. */
416 extern HARD_REG_SET call_used_reg_set;
418 /* Registers that we don't want to caller save. */
419 extern HARD_REG_SET losing_caller_save_reg_set;
421 /* Indexed by hard register number, contains 1 for registers that are
422 fixed use -- i.e. in fixed_regs -- or a function value return register
423 or TARGET_STRUCT_VALUE_RTX or STATIC_CHAIN_REGNUM. These are the
424 registers that cannot hold quantities across calls even if we are
425 willing to save and restore them. */
427 extern char call_fixed_regs[FIRST_PSEUDO_REGISTER];
429 /* The same info as a HARD_REG_SET. */
431 extern HARD_REG_SET call_fixed_reg_set;
433 /* Indexed by hard register number, contains 1 for registers
434 that are being used for global register decls.
435 These must be exempt from ordinary flow analysis
436 and are also considered fixed. */
438 extern char global_regs[FIRST_PSEUDO_REGISTER];
440 /* Contains 1 for registers that are set or clobbered by calls. */
441 /* ??? Ideally, this would be just call_used_regs plus global_regs, but
442 for someone's bright idea to have call_used_regs strictly include
443 fixed_regs. Which leaves us guessing as to the set of fixed_regs
444 that are actually preserved. We know for sure that those associated
445 with the local stack frame are safe, but scant others. */
447 extern HARD_REG_SET regs_invalidated_by_call;
449 #ifdef REG_ALLOC_ORDER
450 /* Table of register numbers in the order in which to try to use them. */
452 extern int reg_alloc_order[FIRST_PSEUDO_REGISTER];
454 /* The inverse of reg_alloc_order. */
456 extern int inv_reg_alloc_order[FIRST_PSEUDO_REGISTER];
457 #endif
459 /* For each reg class, a HARD_REG_SET saying which registers are in it. */
461 extern HARD_REG_SET reg_class_contents[N_REG_CLASSES];
463 /* For each reg class, number of regs it contains. */
465 extern unsigned int reg_class_size[N_REG_CLASSES];
467 /* For each reg class, table listing all the containing classes. */
469 extern enum reg_class reg_class_superclasses[N_REG_CLASSES][N_REG_CLASSES];
471 /* For each reg class, table listing all the classes contained in it. */
473 extern enum reg_class reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES];
475 /* For each pair of reg classes,
476 a largest reg class contained in their union. */
478 extern enum reg_class reg_class_subunion[N_REG_CLASSES][N_REG_CLASSES];
480 /* For each pair of reg classes,
481 the smallest reg class that contains their union. */
483 extern enum reg_class reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES];
485 /* Number of non-fixed registers. */
487 extern int n_non_fixed_regs;
489 /* Vector indexed by hardware reg giving its name. */
491 extern const char * reg_names[FIRST_PSEUDO_REGISTER];
493 /* Vector indexed by reg class giving its name. */
495 extern const char * reg_class_names[];
497 /* Given a hard REGN a FROM mode and a TO mode, return nonzero if
498 REGN cannot change modes between the specified modes. */
499 #define REG_CANNOT_CHANGE_MODE_P(REGN, FROM, TO) \
500 CANNOT_CHANGE_MODE_CLASS (FROM, TO, REGNO_REG_CLASS (REGN))
502 #endif /* ! GCC_HARD_REG_SET_H */