]>
Commit | Line | Data |
---|---|---|
3245eea0 | 1 | /* Sets (bit vectors) of hard registers, and operations on them. |
89638955 | 2 | Copyright (C) 1987, 1992, 1994 Free Software Foundation, Inc. |
3245eea0 CH |
3 | |
4 | This file is part of GNU CC | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
a35311b0 RK |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
3245eea0 CH |
20 | |
21 | ||
22 | /* Define the type of a set of hard registers. */ | |
23 | ||
328d0797 RS |
24 | /* HARD_REG_ELT_TYPE is a typedef of the unsigned integral type which |
25 | will be used for hard reg sets, either alone or in an array. | |
26 | ||
27 | If HARD_REG_SET is a macro, its definition is HARD_REG_ELT_TYPE, | |
28 | and it has enough bits to represent all the target machine's hard | |
29 | registers. Otherwise, it is a typedef for a suitably sized array | |
30 | of HARD_REG_ELT_TYPEs. HARD_REG_SET_LONGS is defined as how many. | |
3245eea0 CH |
31 | |
32 | Note that lots of code assumes that the first part of a regset is | |
33 | the same format as a HARD_REG_SET. To help make sure this is true, | |
34 | we only try the widest integer mode (HOST_WIDE_INT) instead of all the | |
328d0797 RS |
35 | smaller types. This approach loses only if there are a very few |
36 | registers and then only in the few cases where we have an array of | |
37 | HARD_REG_SETs, so it needn't be as complex as it used to be. */ | |
38 | ||
39 | typedef unsigned HOST_WIDE_INT HARD_REG_ELT_TYPE; | |
3245eea0 CH |
40 | |
41 | #if FIRST_PSEUDO_REGISTER <= HOST_BITS_PER_WIDE_INT | |
328d0797 RS |
42 | |
43 | #define HARD_REG_SET HARD_REG_ELT_TYPE | |
3245eea0 CH |
44 | |
45 | #else | |
46 | ||
47 | #define HARD_REG_SET_LONGS \ | |
48 | ((FIRST_PSEUDO_REGISTER + HOST_BITS_PER_WIDE_INT - 1) \ | |
49 | / HOST_BITS_PER_WIDE_INT) | |
328d0797 | 50 | typedef HARD_REG_ELT_TYPE HARD_REG_SET[HARD_REG_SET_LONGS]; |
3245eea0 CH |
51 | |
52 | #endif | |
53 | ||
328d0797 RS |
54 | /* HARD_CONST is used to cast a constant to the appropriate type |
55 | for use with a HARD_REG_SET. */ | |
3245eea0 | 56 | |
328d0797 | 57 | #define HARD_CONST(X) ((HARD_REG_ELT_TYPE) (X)) |
3245eea0 CH |
58 | |
59 | /* Define macros SET_HARD_REG_BIT, CLEAR_HARD_REG_BIT and TEST_HARD_REG_BIT | |
60 | to set, clear or test one bit in a hard reg set of type HARD_REG_SET. | |
61 | All three take two arguments: the set and the register number. | |
62 | ||
63 | In the case where sets are arrays of longs, the first argument | |
64 | is actually a pointer to a long. | |
65 | ||
66 | Define two macros for initializing a set: | |
67 | CLEAR_HARD_REG_SET and SET_HARD_REG_SET. | |
68 | These take just one argument. | |
69 | ||
70 | Also define macros for copying hard reg sets: | |
71 | COPY_HARD_REG_SET and COMPL_HARD_REG_SET. | |
72 | These take two arguments TO and FROM; they read from FROM | |
73 | and store into TO. COMPL_HARD_REG_SET complements each bit. | |
74 | ||
75 | Also define macros for combining hard reg sets: | |
76 | IOR_HARD_REG_SET and AND_HARD_REG_SET. | |
77 | These take two arguments TO and FROM; they read from FROM | |
78 | and combine bitwise into TO. Define also two variants | |
79 | IOR_COMPL_HARD_REG_SET and AND_COMPL_HARD_REG_SET | |
80 | which use the complement of the set FROM. | |
81 | ||
82 | Also define GO_IF_HARD_REG_SUBSET (X, Y, TO): | |
83 | if X is a subset of Y, go to TO. | |
84 | */ | |
85 | ||
86 | #ifdef HARD_REG_SET | |
87 | ||
88 | #define SET_HARD_REG_BIT(SET, BIT) \ | |
89 | ((SET) |= HARD_CONST (1) << (BIT)) | |
90 | #define CLEAR_HARD_REG_BIT(SET, BIT) \ | |
91 | ((SET) &= ~(HARD_CONST (1) << (BIT))) | |
92 | #define TEST_HARD_REG_BIT(SET, BIT) \ | |
93 | ((SET) & (HARD_CONST (1) << (BIT))) | |
94 | ||
95 | #define CLEAR_HARD_REG_SET(TO) ((TO) = HARD_CONST (0)) | |
328d0797 | 96 | #define SET_HARD_REG_SET(TO) ((TO) = ~ HARD_CONST (0)) |
3245eea0 CH |
97 | |
98 | #define COPY_HARD_REG_SET(TO, FROM) ((TO) = (FROM)) | |
99 | #define COMPL_HARD_REG_SET(TO, FROM) ((TO) = ~(FROM)) | |
100 | ||
101 | #define IOR_HARD_REG_SET(TO, FROM) ((TO) |= (FROM)) | |
102 | #define IOR_COMPL_HARD_REG_SET(TO, FROM) ((TO) |= ~ (FROM)) | |
103 | #define AND_HARD_REG_SET(TO, FROM) ((TO) &= (FROM)) | |
104 | #define AND_COMPL_HARD_REG_SET(TO, FROM) ((TO) &= ~ (FROM)) | |
105 | ||
106 | #define GO_IF_HARD_REG_SUBSET(X,Y,TO) if (HARD_CONST (0) == ((X) & ~(Y))) goto TO | |
107 | ||
108 | #define GO_IF_HARD_REG_EQUAL(X,Y,TO) if ((X) == (Y)) goto TO | |
328d0797 | 109 | |
3245eea0 CH |
110 | #else |
111 | ||
112 | #define UHOST_BITS_PER_WIDE_INT ((unsigned) HOST_BITS_PER_WIDE_INT) | |
113 | ||
114 | #define SET_HARD_REG_BIT(SET, BIT) \ | |
115 | ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ | |
328d0797 | 116 | |= HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT)) |
3245eea0 CH |
117 | |
118 | #define CLEAR_HARD_REG_BIT(SET, BIT) \ | |
119 | ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ | |
328d0797 | 120 | &= ~(HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))) |
3245eea0 CH |
121 | |
122 | #define TEST_HARD_REG_BIT(SET, BIT) \ | |
123 | ((SET)[(BIT) / UHOST_BITS_PER_WIDE_INT] \ | |
328d0797 | 124 | & (HARD_CONST (1) << ((BIT) % UHOST_BITS_PER_WIDE_INT))) |
3245eea0 CH |
125 | |
126 | #define CLEAR_HARD_REG_SET(TO) \ | |
328d0797 | 127 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ |
3245eea0 CH |
128 | register int i; \ |
129 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ | |
130 | *scan_tp_++ = 0; } while (0) | |
131 | ||
132 | #define SET_HARD_REG_SET(TO) \ | |
328d0797 | 133 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO); \ |
3245eea0 CH |
134 | register int i; \ |
135 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ | |
136 | *scan_tp_++ = -1; } while (0) | |
137 | ||
138 | #define COPY_HARD_REG_SET(TO, FROM) \ | |
328d0797 | 139 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
3245eea0 CH |
140 | register int i; \ |
141 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ | |
142 | *scan_tp_++ = *scan_fp_++; } while (0) | |
143 | ||
144 | #define COMPL_HARD_REG_SET(TO, FROM) \ | |
328d0797 | 145 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
3245eea0 CH |
146 | register int i; \ |
147 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ | |
148 | *scan_tp_++ = ~ *scan_fp_++; } while (0) | |
149 | ||
150 | #define AND_HARD_REG_SET(TO, FROM) \ | |
328d0797 | 151 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
3245eea0 CH |
152 | register int i; \ |
153 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ | |
154 | *scan_tp_++ &= *scan_fp_++; } while (0) | |
155 | ||
156 | #define AND_COMPL_HARD_REG_SET(TO, FROM) \ | |
328d0797 | 157 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
3245eea0 CH |
158 | register int i; \ |
159 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ | |
160 | *scan_tp_++ &= ~ *scan_fp_++; } while (0) | |
161 | ||
162 | #define IOR_HARD_REG_SET(TO, FROM) \ | |
328d0797 | 163 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
3245eea0 CH |
164 | register int i; \ |
165 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ | |
166 | *scan_tp_++ |= *scan_fp_++; } while (0) | |
167 | ||
168 | #define IOR_COMPL_HARD_REG_SET(TO, FROM) \ | |
328d0797 | 169 | do { register HARD_REG_ELT_TYPE *scan_tp_ = (TO), *scan_fp_ = (FROM); \ |
3245eea0 CH |
170 | register int i; \ |
171 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ | |
172 | *scan_tp_++ |= ~ *scan_fp_++; } while (0) | |
173 | ||
174 | #define GO_IF_HARD_REG_SUBSET(X,Y,TO) \ | |
328d0797 | 175 | do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \ |
3245eea0 CH |
176 | register int i; \ |
177 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ | |
328d0797 | 178 | if (0 != (*scan_xp_++ & ~ *scan_yp_++)) break; \ |
3245eea0 CH |
179 | if (i == HARD_REG_SET_LONGS) goto TO; } while (0) |
180 | ||
181 | #define GO_IF_HARD_REG_EQUAL(X,Y,TO) \ | |
328d0797 | 182 | do { register HARD_REG_ELT_TYPE *scan_xp_ = (X), *scan_yp_ = (Y); \ |
3245eea0 CH |
183 | register int i; \ |
184 | for (i = 0; i < HARD_REG_SET_LONGS; i++) \ | |
5384893b | 185 | if (*scan_xp_++ != *scan_yp_++) break; \ |
3245eea0 CH |
186 | if (i == HARD_REG_SET_LONGS) goto TO; } while (0) |
187 | ||
188 | #endif | |
189 | ||
190 | /* Define some standard sets of registers. */ | |
191 | ||
192 | /* Indexed by hard register number, contains 1 for registers | |
193 | that are fixed use (stack pointer, pc, frame pointer, etc.). | |
194 | These are the registers that cannot be used to allocate | |
195 | a pseudo reg whose life does not cross calls. */ | |
196 | ||
197 | extern char fixed_regs[FIRST_PSEUDO_REGISTER]; | |
198 | ||
199 | /* The same info as a HARD_REG_SET. */ | |
200 | ||
201 | extern HARD_REG_SET fixed_reg_set; | |
202 | ||
203 | /* Indexed by hard register number, contains 1 for registers | |
204 | that are fixed use or are clobbered by function calls. | |
205 | These are the registers that cannot be used to allocate | |
206 | a pseudo reg whose life crosses calls. */ | |
207 | ||
208 | extern char call_used_regs[FIRST_PSEUDO_REGISTER]; | |
209 | ||
210 | /* The same info as a HARD_REG_SET. */ | |
211 | ||
212 | extern HARD_REG_SET call_used_reg_set; | |
213 | ||
6cad67d2 JL |
214 | /* Registers that we don't want to caller save. */ |
215 | extern HARD_REG_SET losing_caller_save_reg_set; | |
216 | ||
3245eea0 CH |
217 | /* Indexed by hard register number, contains 1 for registers that are |
218 | fixed use -- i.e. in fixed_regs -- or a function value return register | |
219 | or STRUCT_VALUE_REGNUM or STATIC_CHAIN_REGNUM. These are the | |
220 | registers that cannot hold quantities across calls even if we are | |
221 | willing to save and restore them. */ | |
222 | ||
223 | extern char call_fixed_regs[FIRST_PSEUDO_REGISTER]; | |
224 | ||
225 | /* The same info as a HARD_REG_SET. */ | |
226 | ||
227 | extern HARD_REG_SET call_fixed_reg_set; | |
228 | ||
229 | /* Indexed by hard register number, contains 1 for registers | |
230 | that are being used for global register decls. | |
231 | These must be exempt from ordinary flow analysis | |
232 | and are also considered fixed. */ | |
233 | ||
234 | extern char global_regs[FIRST_PSEUDO_REGISTER]; | |
235 | ||
236 | /* Table of register numbers in the order in which to try to use them. */ | |
237 | ||
238 | #ifdef REG_ALLOC_ORDER /* Avoid undef symbol in certain broken linkers. */ | |
239 | extern int reg_alloc_order[FIRST_PSEUDO_REGISTER]; | |
240 | #endif | |
241 | ||
242 | /* For each reg class, a HARD_REG_SET saying which registers are in it. */ | |
243 | ||
244 | extern HARD_REG_SET reg_class_contents[]; | |
245 | ||
246 | /* For each reg class, number of regs it contains. */ | |
247 | ||
248 | extern int reg_class_size[N_REG_CLASSES]; | |
249 | ||
250 | /* For each reg class, table listing all the containing classes. */ | |
251 | ||
252 | extern enum reg_class reg_class_superclasses[N_REG_CLASSES][N_REG_CLASSES]; | |
253 | ||
254 | /* For each reg class, table listing all the classes contained in it. */ | |
255 | ||
256 | extern enum reg_class reg_class_subclasses[N_REG_CLASSES][N_REG_CLASSES]; | |
257 | ||
258 | /* For each pair of reg classes, | |
259 | a largest reg class contained in their union. */ | |
260 | ||
261 | extern enum reg_class reg_class_subunion[N_REG_CLASSES][N_REG_CLASSES]; | |
262 | ||
263 | /* For each pair of reg classes, | |
264 | the smallest reg class that contains their union. */ | |
265 | ||
266 | extern enum reg_class reg_class_superunion[N_REG_CLASSES][N_REG_CLASSES]; | |
267 | ||
268 | /* Number of non-fixed registers. */ | |
269 | ||
270 | extern int n_non_fixed_regs; | |
271 | ||
272 | /* Vector indexed by hardware reg giving its name. */ | |
273 | ||
274 | extern char *reg_names[FIRST_PSEUDO_REGISTER]; |