Line data Source code
1 : /* Define per-register tables for data flow info and register allocation.
2 : Copyright (C) 1987-2026 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_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
42 : magical way or the pass needs to have accurate values for these
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
46 : should be made to regstat_free_n_sets_and_refs.
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 : inline int
68 4602988 : REG_N_REFS (int regno)
69 : {
70 4602988 : 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 : inline int
79 886975772 : REG_N_SETS (int regno)
80 : {
81 886975772 : 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 :
88 : /* Given a REG, return TRUE if the reg is a PARM_DECL, FALSE otherwise. */
89 : extern bool reg_is_parm_p (rtx);
90 :
91 : /* Functions defined in regstat.cc. */
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);
99 : extern void dump_reg_info (FILE *);
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. */
131 : #define REG_FREQ_FROM_BB(bb) ((optimize_function_for_size_p (cfun) \
132 : || !cfun->cfg->count_max.initialized_p ()) \
133 : ? REG_FREQ_MAX \
134 : : ((bb)->count.to_frequency (cfun) \
135 : * REG_FREQ_MAX / BB_FREQ_MAX) \
136 : ? ((bb)->count.to_frequency (cfun) \
137 : * REG_FREQ_MAX / BB_FREQ_MAX) \
138 : : 1)
139 :
140 : /* Indexed by N, gives number of insns in which register N dies.
141 : Note that if register N is live around loops, it can die
142 : in transitions between basic blocks, and that is not counted here.
143 : So this is only a reliable indicator of how many regions of life there are
144 : for registers that are contained in one basic block. */
145 :
146 : #define REG_N_DEATHS(N) (reg_info_p[N].deaths)
147 :
148 : /* Get the number of consecutive words required to hold pseudo-reg N. */
149 :
150 : #define PSEUDO_REGNO_SIZE(N) \
151 : ((GET_MODE_SIZE (PSEUDO_REGNO_MODE (N)) + UNITS_PER_WORD - 1) \
152 : / UNITS_PER_WORD)
153 :
154 : /* Get the number of bytes required to hold pseudo-reg N. */
155 :
156 : #define PSEUDO_REGNO_BYTES(N) \
157 : GET_MODE_SIZE (PSEUDO_REGNO_MODE (N))
158 :
159 : /* Get the machine mode of pseudo-reg N. */
160 :
161 : #define PSEUDO_REGNO_MODE(N) GET_MODE (regno_reg_rtx[N])
162 :
163 : /* Indexed by N, gives number of CALL_INSNS across which (REG n) is live. */
164 :
165 : #define REG_N_CALLS_CROSSED(N) (reg_info_p[N].calls_crossed)
166 :
167 : /* Indexed by n, gives number of basic block that (REG n) is used in.
168 : If the value is REG_BLOCK_GLOBAL (-1),
169 : it means (REG n) is used in more than one basic block.
170 : REG_BLOCK_UNKNOWN (0) means it hasn't been seen yet so we don't know.
171 : This information remains valid for the rest of the compilation
172 : of the current function; it is used to control register allocation. */
173 :
174 : #define REG_BLOCK_UNKNOWN 0
175 : #define REG_BLOCK_GLOBAL -1
176 :
177 : #define REG_BASIC_BLOCK(N) (reg_info_p[N].basic_block)
178 :
179 : /* Vector of substitutions of register numbers,
180 : used to map pseudo regs into hardware regs.
181 :
182 : This can't be folded into reg_n_info without changing all of the
183 : machine dependent directories, since the reload functions
184 : in the machine dependent files access it. */
185 :
186 : extern short *reg_renumber;
187 :
188 : /* Flag set by local-alloc or global-alloc if they decide to allocate
189 : something in a call-clobbered register. */
190 :
191 : extern int caller_save_needed;
192 :
193 : /* Select a register mode required for caller save of hard regno REGNO. */
194 : #ifndef HARD_REGNO_CALLER_SAVE_MODE
195 : #define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \
196 : choose_hard_reg_mode (REGNO, NREGS, NULL)
197 : #endif
198 :
199 : /* Target-dependent globals. */
200 : struct target_regs {
201 : /* For each starting hard register, the number of consecutive hard
202 : registers that a given machine mode occupies. */
203 : unsigned char x_hard_regno_nregs[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE];
204 :
205 : /* The max value found in x_hard_regno_nregs. */
206 : unsigned char x_hard_regno_max_nregs;
207 :
208 : /* For each hard register, the widest mode object that it can contain.
209 : This will be a MODE_INT mode if the register can hold integers. Otherwise
210 : it will be a MODE_FLOAT or a MODE_CC mode, whichever is valid for the
211 : register. */
212 : machine_mode x_reg_raw_mode[FIRST_PSEUDO_REGISTER];
213 :
214 : /* Vector indexed by machine mode saying whether there are regs of
215 : that mode. */
216 : bool x_have_regs_of_mode[MAX_MACHINE_MODE];
217 :
218 : /* 1 if the corresponding class contains a register of the given mode. */
219 : char x_contains_reg_of_mode[N_REG_CLASSES][MAX_MACHINE_MODE];
220 :
221 : /* 1 if the corresponding class contains a register of the given mode
222 : which is not global and can therefore be allocated. */
223 : char x_contains_allocatable_reg_of_mode[N_REG_CLASSES][MAX_MACHINE_MODE];
224 :
225 : /* Record for each mode whether we can move a register directly to or
226 : from an object of that mode in memory. If we can't, we won't try
227 : to use that mode directly when accessing a field of that mode. */
228 : char x_direct_load[NUM_MACHINE_MODES];
229 : char x_direct_store[NUM_MACHINE_MODES];
230 :
231 : /* Record for each mode whether we can float-extend from memory. */
232 : bool x_float_extend_from_mem[NUM_MACHINE_MODES][NUM_MACHINE_MODES];
233 : };
234 :
235 : extern struct target_regs default_target_regs;
236 : #if SWITCHABLE_TARGET
237 : extern struct target_regs *this_target_regs;
238 : #else
239 : #define this_target_regs (&default_target_regs)
240 : #endif
241 : #define hard_regno_max_nregs \
242 : (this_target_regs->x_hard_regno_max_nregs)
243 : #define reg_raw_mode \
244 : (this_target_regs->x_reg_raw_mode)
245 : #define have_regs_of_mode \
246 : (this_target_regs->x_have_regs_of_mode)
247 : #define contains_reg_of_mode \
248 : (this_target_regs->x_contains_reg_of_mode)
249 : #define contains_allocatable_reg_of_mode \
250 : (this_target_regs->x_contains_allocatable_reg_of_mode)
251 : #define direct_load \
252 : (this_target_regs->x_direct_load)
253 : #define direct_store \
254 : (this_target_regs->x_direct_store)
255 : #define float_extend_from_mem \
256 : (this_target_regs->x_float_extend_from_mem)
257 :
258 : /* Return the number of hard registers in (reg:MODE REGNO). */
259 :
260 : ALWAYS_INLINE unsigned char
261 30203813411 : hard_regno_nregs (unsigned int regno, machine_mode mode)
262 : {
263 17939350827 : return this_target_regs->x_hard_regno_nregs[regno][mode];
264 : }
265 :
266 : /* Return an exclusive upper bound on the registers occupied by hard
267 : register (reg:MODE REGNO). */
268 :
269 : inline unsigned int
270 13100444413 : end_hard_regno (machine_mode mode, unsigned int regno)
271 : {
272 12619996786 : return regno + hard_regno_nregs (regno, mode);
273 : }
274 :
275 : /* Add to REGS all the registers required to store a value of mode MODE
276 : in register REGNO. */
277 :
278 : inline void
279 3068223098 : add_to_hard_reg_set (HARD_REG_SET *regs, machine_mode mode,
280 : unsigned int regno)
281 : {
282 3068223098 : unsigned int end_regno;
283 :
284 3068223098 : end_regno = end_hard_regno (mode, regno);
285 3585667475 : do
286 3585667475 : SET_HARD_REG_BIT (*regs, regno);
287 3585667475 : while (++regno < end_regno);
288 3068223098 : }
289 :
290 : /* Likewise, but remove the registers. */
291 :
292 : inline void
293 365393780 : remove_from_hard_reg_set (HARD_REG_SET *regs, machine_mode mode,
294 : unsigned int regno)
295 : {
296 365393780 : unsigned int end_regno;
297 :
298 365393780 : end_regno = end_hard_regno (mode, regno);
299 400916631 : do
300 400916631 : CLEAR_HARD_REG_BIT (*regs, regno);
301 400916631 : while (++regno < end_regno);
302 365393780 : }
303 :
304 : /* Return true if REGS contains the whole of (reg:MODE REGNO). */
305 :
306 : inline bool
307 8376909915 : in_hard_reg_set_p (const_hard_reg_set regs, machine_mode mode,
308 : unsigned int regno)
309 : {
310 8376909915 : unsigned int end_regno;
311 :
312 8376909915 : gcc_assert (HARD_REGISTER_NUM_P (regno));
313 :
314 8376909915 : if (!TEST_HARD_REG_BIT (regs, regno))
315 : return false;
316 :
317 7068659448 : end_regno = end_hard_regno (mode, regno);
318 :
319 7068659448 : if (!HARD_REGISTER_NUM_P (end_regno - 1))
320 : return false;
321 :
322 7584289050 : while (++regno < end_regno)
323 617106038 : if (!TEST_HARD_REG_BIT (regs, regno))
324 : return false;
325 :
326 : return true;
327 : }
328 :
329 : /* Return true if (reg:MODE REGNO) includes an element of REGS. */
330 :
331 : inline bool
332 4420487517 : overlaps_hard_reg_set_p (const_hard_reg_set regs, machine_mode mode,
333 : unsigned int regno)
334 : {
335 4420487517 : unsigned int end_regno;
336 :
337 4420487517 : if (TEST_HARD_REG_BIT (regs, regno))
338 : return true;
339 :
340 1167142679 : end_regno = end_hard_regno (mode, regno);
341 1265491183 : while (++regno < end_regno)
342 189614723 : if (TEST_HARD_REG_BIT (regs, regno))
343 : return true;
344 :
345 : return false;
346 : }
347 :
348 : /* Like add_to_hard_reg_set, but use a REGNO/NREGS range instead of
349 : REGNO and MODE. */
350 :
351 : inline void
352 41543 : add_range_to_hard_reg_set (HARD_REG_SET *regs, unsigned int regno,
353 : int nregs)
354 : {
355 83086 : while (nregs-- > 0)
356 41543 : SET_HARD_REG_BIT (*regs, regno + nregs);
357 41543 : }
358 :
359 : /* Likewise, but remove the registers. */
360 :
361 : inline void
362 3225528 : remove_range_from_hard_reg_set (HARD_REG_SET *regs, unsigned int regno,
363 : int nregs)
364 : {
365 6451056 : while (nregs-- > 0)
366 3225528 : CLEAR_HARD_REG_BIT (*regs, regno + nregs);
367 3225528 : }
368 :
369 : /* Like overlaps_hard_reg_set_p, but use a REGNO/NREGS range instead of
370 : REGNO and MODE. */
371 : inline bool
372 10301386 : range_overlaps_hard_reg_set_p (const_hard_reg_set set, unsigned regno,
373 : int nregs)
374 : {
375 11244122 : while (nregs-- > 0)
376 10301386 : if (TEST_HARD_REG_BIT (set, regno + nregs))
377 : return true;
378 : return false;
379 : }
380 :
381 : /* Like in_hard_reg_set_p, but use a REGNO/NREGS range instead of
382 : REGNO and MODE. */
383 : inline bool
384 3675769 : range_in_hard_reg_set_p (const_hard_reg_set set, unsigned regno, int nregs)
385 : {
386 6901297 : while (nregs-- > 0)
387 3675769 : if (!TEST_HARD_REG_BIT (set, regno + nregs))
388 : return false;
389 : return true;
390 : }
391 :
392 : #endif /* GCC_REGS_H */
|
