Mercurial > hg > CbC > CbC_gcc
annotate gcc/regs.h @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | f6334be47118 |
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0 | 1 /* Define per-register tables for data flow info and register allocation. |
111 | 2 Copyright (C) 1987-2017 Free Software Foundation, Inc. |
0 | 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_REGS_H | |
21 #define GCC_REGS_H | |
22 | |
23 #define REG_BYTES(R) mode_size[(int) GET_MODE (R)] | |
24 | |
25 /* When you only have the mode of a pseudo register before it has a hard | |
26 register chosen for it, this reports the size of each hard register | |
27 a pseudo in such a mode would get allocated to. A target may | |
28 override this. */ | |
29 | |
30 #ifndef REGMODE_NATURAL_SIZE | |
31 #define REGMODE_NATURAL_SIZE(MODE) UNITS_PER_WORD | |
32 #endif | |
33 | |
34 /* Maximum register number used in this function, plus one. */ | |
35 | |
36 extern int max_regno; | |
37 | |
38 /* REG_N_REFS and REG_N_SETS are initialized by a call to | |
39 regstat_init_n_sets_and_refs from the current values of | |
40 DF_REG_DEF_COUNT and DF_REG_USE_COUNT. REG_N_REFS and REG_N_SETS | |
41 should only be used if a pass need to change these values in some | |
111 | 42 magical way or the pass needs to have accurate values for these |
0 | 43 and is not using incremental df scanning. |
44 | |
45 At the end of a pass that uses REG_N_REFS and REG_N_SETS, a call | |
55
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46 should be made to regstat_free_n_sets_and_refs. |
0 | 47 |
48 Local alloc seems to play pretty loose with these values. | |
49 REG_N_REFS is set to 0 if the register is used in an asm. | |
50 Furthermore, local_alloc calls regclass to hack both REG_N_REFS and | |
51 REG_N_SETS for three address insns. Other passes seem to have | |
52 other special values. */ | |
53 | |
54 | |
55 | |
56 /* Structure to hold values for REG_N_SETS (i) and REG_N_REFS (i). */ | |
57 | |
58 struct regstat_n_sets_and_refs_t | |
59 { | |
60 int sets; /* # of times (REG n) is set */ | |
61 int refs; /* # of times (REG n) is used or set */ | |
62 }; | |
63 | |
64 extern struct regstat_n_sets_and_refs_t *regstat_n_sets_and_refs; | |
65 | |
66 /* Indexed by n, gives number of times (REG n) is used or set. */ | |
67 static inline int | |
111 | 68 REG_N_REFS (int regno) |
0 | 69 { |
70 return regstat_n_sets_and_refs[regno].refs; | |
71 } | |
72 | |
73 /* Indexed by n, gives number of times (REG n) is used or set. */ | |
74 #define SET_REG_N_REFS(N,V) (regstat_n_sets_and_refs[N].refs = V) | |
75 #define INC_REG_N_REFS(N,V) (regstat_n_sets_and_refs[N].refs += V) | |
76 | |
77 /* Indexed by n, gives number of times (REG n) is set. */ | |
78 static inline int | |
79 REG_N_SETS (int regno) | |
80 { | |
81 return regstat_n_sets_and_refs[regno].sets; | |
82 } | |
83 | |
84 /* Indexed by n, gives number of times (REG n) is set. */ | |
85 #define SET_REG_N_SETS(N,V) (regstat_n_sets_and_refs[N].sets = V) | |
86 #define INC_REG_N_SETS(N,V) (regstat_n_sets_and_refs[N].sets += V) | |
87 | |
111 | 88 /* Given a REG, return TRUE if the reg is a PARM_DECL, FALSE otherwise. */ |
89 extern bool reg_is_parm_p (rtx); | |
0 | 90 |
111 | 91 /* Functions defined in regstat.c. */ |
0 | 92 extern void regstat_init_n_sets_and_refs (void); |
93 extern void regstat_free_n_sets_and_refs (void); | |
94 extern void regstat_compute_ri (void); | |
95 extern void regstat_free_ri (void); | |
96 extern bitmap regstat_get_setjmp_crosses (void); | |
97 extern void regstat_compute_calls_crossed (void); | |
98 extern void regstat_free_calls_crossed (void); | |
111 | 99 extern void dump_reg_info (FILE *); |
0 | 100 |
101 /* Register information indexed by register number. This structure is | |
102 initialized by calling regstat_compute_ri and is destroyed by | |
103 calling regstat_free_ri. */ | |
104 struct reg_info_t | |
105 { | |
106 int freq; /* # estimated frequency (REG n) is used or set */ | |
107 int deaths; /* # of times (REG n) dies */ | |
108 int calls_crossed; /* # of calls (REG n) is live across */ | |
109 int basic_block; /* # of basic blocks (REG n) is used in */ | |
110 }; | |
111 | |
112 extern struct reg_info_t *reg_info_p; | |
113 | |
114 /* The number allocated elements of reg_info_p. */ | |
115 extern size_t reg_info_p_size; | |
116 | |
117 /* Estimate frequency of references to register N. */ | |
118 | |
119 #define REG_FREQ(N) (reg_info_p[N].freq) | |
120 | |
121 /* The weights for each insn varies from 0 to REG_FREQ_BASE. | |
122 This constant does not need to be high, as in infrequently executed | |
123 regions we want to count instructions equivalently to optimize for | |
124 size instead of speed. */ | |
125 #define REG_FREQ_MAX 1000 | |
126 | |
127 /* Compute register frequency from the BB frequency. When optimizing for size, | |
128 or profile driven feedback is available and the function is never executed, | |
129 frequency is always equivalent. Otherwise rescale the basic block | |
130 frequency. */ | |
111 | 131 #define REG_FREQ_FROM_BB(bb) (optimize_function_for_size_p (cfun) \ |
0 | 132 ? REG_FREQ_MAX \ |
133 : ((bb)->frequency * REG_FREQ_MAX / BB_FREQ_MAX)\ | |
134 ? ((bb)->frequency * REG_FREQ_MAX / BB_FREQ_MAX)\ | |
135 : 1) | |
136 | |
137 /* Indexed by N, gives number of insns in which register N dies. | |
138 Note that if register N is live around loops, it can die | |
139 in transitions between basic blocks, and that is not counted here. | |
140 So this is only a reliable indicator of how many regions of life there are | |
141 for registers that are contained in one basic block. */ | |
142 | |
143 #define REG_N_DEATHS(N) (reg_info_p[N].deaths) | |
144 | |
145 /* Get the number of consecutive words required to hold pseudo-reg N. */ | |
146 | |
147 #define PSEUDO_REGNO_SIZE(N) \ | |
148 ((GET_MODE_SIZE (PSEUDO_REGNO_MODE (N)) + UNITS_PER_WORD - 1) \ | |
149 / UNITS_PER_WORD) | |
150 | |
151 /* Get the number of bytes required to hold pseudo-reg N. */ | |
152 | |
153 #define PSEUDO_REGNO_BYTES(N) \ | |
154 GET_MODE_SIZE (PSEUDO_REGNO_MODE (N)) | |
155 | |
156 /* Get the machine mode of pseudo-reg N. */ | |
157 | |
158 #define PSEUDO_REGNO_MODE(N) GET_MODE (regno_reg_rtx[N]) | |
159 | |
160 /* Indexed by N, gives number of CALL_INSNS across which (REG n) is live. */ | |
161 | |
162 #define REG_N_CALLS_CROSSED(N) (reg_info_p[N].calls_crossed) | |
163 | |
164 /* Indexed by n, gives number of basic block that (REG n) is used in. | |
165 If the value is REG_BLOCK_GLOBAL (-1), | |
166 it means (REG n) is used in more than one basic block. | |
167 REG_BLOCK_UNKNOWN (0) means it hasn't been seen yet so we don't know. | |
168 This information remains valid for the rest of the compilation | |
169 of the current function; it is used to control register allocation. */ | |
170 | |
171 #define REG_BLOCK_UNKNOWN 0 | |
172 #define REG_BLOCK_GLOBAL -1 | |
173 | |
174 #define REG_BASIC_BLOCK(N) (reg_info_p[N].basic_block) | |
175 | |
176 /* Vector of substitutions of register numbers, | |
177 used to map pseudo regs into hardware regs. | |
178 | |
179 This can't be folded into reg_n_info without changing all of the | |
180 machine dependent directories, since the reload functions | |
181 in the machine dependent files access it. */ | |
182 | |
183 extern short *reg_renumber; | |
184 | |
185 /* Flag set by local-alloc or global-alloc if they decide to allocate | |
186 something in a call-clobbered register. */ | |
187 | |
188 extern int caller_save_needed; | |
189 | |
190 /* Select a register mode required for caller save of hard regno REGNO. */ | |
191 #ifndef HARD_REGNO_CALLER_SAVE_MODE | |
192 #define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \ | |
193 choose_hard_reg_mode (REGNO, NREGS, false) | |
194 #endif | |
195 | |
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196 /* Target-dependent globals. */ |
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197 struct target_regs { |
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198 /* For each starting hard register, the number of consecutive hard |
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199 registers that a given machine mode occupies. */ |
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200 unsigned char x_hard_regno_nregs[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE]; |
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201 |
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202 /* For each hard register, the widest mode object that it can contain. |
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203 This will be a MODE_INT mode if the register can hold integers. Otherwise |
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204 it will be a MODE_FLOAT or a MODE_CC mode, whichever is valid for the |
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205 register. */ |
111 | 206 machine_mode x_reg_raw_mode[FIRST_PSEUDO_REGISTER]; |
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207 |
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208 /* Vector indexed by machine mode saying whether there are regs of |
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209 that mode. */ |
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210 bool x_have_regs_of_mode[MAX_MACHINE_MODE]; |
0 | 211 |
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212 /* 1 if the corresponding class contains a register of the given mode. */ |
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213 char x_contains_reg_of_mode[N_REG_CLASSES][MAX_MACHINE_MODE]; |
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214 |
111 | 215 /* 1 if the corresponding class contains a register of the given mode |
216 which is not global and can therefore be allocated. */ | |
217 char x_contains_allocatable_reg_of_mode[N_REG_CLASSES][MAX_MACHINE_MODE]; | |
0 | 218 |
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219 /* Record for each mode whether we can move a register directly to or |
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220 from an object of that mode in memory. If we can't, we won't try |
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221 to use that mode directly when accessing a field of that mode. */ |
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222 char x_direct_load[NUM_MACHINE_MODES]; |
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223 char x_direct_store[NUM_MACHINE_MODES]; |
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224 |
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225 /* Record for each mode whether we can float-extend from memory. */ |
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226 bool x_float_extend_from_mem[NUM_MACHINE_MODES][NUM_MACHINE_MODES]; |
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227 }; |
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228 |
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229 extern struct target_regs default_target_regs; |
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230 #if SWITCHABLE_TARGET |
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231 extern struct target_regs *this_target_regs; |
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232 #else |
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233 #define this_target_regs (&default_target_regs) |
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234 #endif |
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235 #define reg_raw_mode \ |
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236 (this_target_regs->x_reg_raw_mode) |
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237 #define have_regs_of_mode \ |
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238 (this_target_regs->x_have_regs_of_mode) |
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239 #define contains_reg_of_mode \ |
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240 (this_target_regs->x_contains_reg_of_mode) |
111 | 241 #define contains_allocatable_reg_of_mode \ |
242 (this_target_regs->x_contains_allocatable_reg_of_mode) | |
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243 #define direct_load \ |
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244 (this_target_regs->x_direct_load) |
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245 #define direct_store \ |
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246 (this_target_regs->x_direct_store) |
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247 #define float_extend_from_mem \ |
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248 (this_target_regs->x_float_extend_from_mem) |
0 | 249 |
111 | 250 /* Return the number of hard registers in (reg:MODE REGNO). */ |
251 | |
252 ALWAYS_INLINE unsigned char | |
253 hard_regno_nregs (unsigned int regno, machine_mode mode) | |
254 { | |
255 return this_target_regs->x_hard_regno_nregs[regno][mode]; | |
256 } | |
257 | |
0 | 258 /* Return an exclusive upper bound on the registers occupied by hard |
259 register (reg:MODE REGNO). */ | |
260 | |
261 static inline unsigned int | |
111 | 262 end_hard_regno (machine_mode mode, unsigned int regno) |
0 | 263 { |
111 | 264 return regno + hard_regno_nregs (regno, mode); |
0 | 265 } |
266 | |
267 /* Add to REGS all the registers required to store a value of mode MODE | |
268 in register REGNO. */ | |
269 | |
270 static inline void | |
111 | 271 add_to_hard_reg_set (HARD_REG_SET *regs, machine_mode mode, |
0 | 272 unsigned int regno) |
273 { | |
274 unsigned int end_regno; | |
275 | |
276 end_regno = end_hard_regno (mode, regno); | |
277 do | |
278 SET_HARD_REG_BIT (*regs, regno); | |
279 while (++regno < end_regno); | |
280 } | |
281 | |
282 /* Likewise, but remove the registers. */ | |
283 | |
284 static inline void | |
111 | 285 remove_from_hard_reg_set (HARD_REG_SET *regs, machine_mode mode, |
0 | 286 unsigned int regno) |
287 { | |
288 unsigned int end_regno; | |
289 | |
290 end_regno = end_hard_regno (mode, regno); | |
291 do | |
292 CLEAR_HARD_REG_BIT (*regs, regno); | |
293 while (++regno < end_regno); | |
294 } | |
295 | |
296 /* Return true if REGS contains the whole of (reg:MODE REGNO). */ | |
297 | |
298 static inline bool | |
111 | 299 in_hard_reg_set_p (const HARD_REG_SET regs, machine_mode mode, |
0 | 300 unsigned int regno) |
301 { | |
302 unsigned int end_regno; | |
303 | |
111 | 304 gcc_assert (HARD_REGISTER_NUM_P (regno)); |
305 | |
0 | 306 if (!TEST_HARD_REG_BIT (regs, regno)) |
307 return false; | |
308 | |
309 end_regno = end_hard_regno (mode, regno); | |
111 | 310 |
311 if (!HARD_REGISTER_NUM_P (end_regno - 1)) | |
312 return false; | |
313 | |
0 | 314 while (++regno < end_regno) |
315 if (!TEST_HARD_REG_BIT (regs, regno)) | |
316 return false; | |
317 | |
318 return true; | |
319 } | |
320 | |
321 /* Return true if (reg:MODE REGNO) includes an element of REGS. */ | |
322 | |
323 static inline bool | |
111 | 324 overlaps_hard_reg_set_p (const HARD_REG_SET regs, machine_mode mode, |
0 | 325 unsigned int regno) |
326 { | |
327 unsigned int end_regno; | |
328 | |
329 if (TEST_HARD_REG_BIT (regs, regno)) | |
330 return true; | |
331 | |
332 end_regno = end_hard_regno (mode, regno); | |
333 while (++regno < end_regno) | |
334 if (TEST_HARD_REG_BIT (regs, regno)) | |
335 return true; | |
336 | |
337 return false; | |
338 } | |
339 | |
111 | 340 /* Like add_to_hard_reg_set, but use a REGNO/NREGS range instead of |
341 REGNO and MODE. */ | |
342 | |
343 static inline void | |
344 add_range_to_hard_reg_set (HARD_REG_SET *regs, unsigned int regno, | |
345 int nregs) | |
346 { | |
347 while (nregs-- > 0) | |
348 SET_HARD_REG_BIT (*regs, regno + nregs); | |
349 } | |
350 | |
351 /* Likewise, but remove the registers. */ | |
352 | |
353 static inline void | |
354 remove_range_from_hard_reg_set (HARD_REG_SET *regs, unsigned int regno, | |
355 int nregs) | |
356 { | |
357 while (nregs-- > 0) | |
358 CLEAR_HARD_REG_BIT (*regs, regno + nregs); | |
359 } | |
360 | |
361 /* Like overlaps_hard_reg_set_p, but use a REGNO/NREGS range instead of | |
362 REGNO and MODE. */ | |
363 static inline bool | |
364 range_overlaps_hard_reg_set_p (const HARD_REG_SET set, unsigned regno, | |
365 int nregs) | |
366 { | |
367 while (nregs-- > 0) | |
368 if (TEST_HARD_REG_BIT (set, regno + nregs)) | |
369 return true; | |
370 return false; | |
371 } | |
372 | |
373 /* Like in_hard_reg_set_p, but use a REGNO/NREGS range instead of | |
374 REGNO and MODE. */ | |
375 static inline bool | |
376 range_in_hard_reg_set_p (const HARD_REG_SET set, unsigned regno, int nregs) | |
377 { | |
378 while (nregs-- > 0) | |
379 if (!TEST_HARD_REG_BIT (set, regno + nregs)) | |
380 return false; | |
381 return true; | |
382 } | |
383 | |
384 /* Get registers used by given function call instruction. */ | |
385 extern bool get_call_reg_set_usage (rtx_insn *insn, HARD_REG_SET *reg_set, | |
386 HARD_REG_SET default_set); | |
387 | |
0 | 388 #endif /* GCC_REGS_H */ |