1 /* Local Register Allocator (LRA) intercommunication header file.
2 Copyright (C) 2010, 2011, 2012
3 Free Software Foundation, Inc.
4 Contributed by Vladimir Makarov <vmakarov@redhat.com>.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 #include "insn-attr.h"
26 #include "insn-codes.h"
28 #define lra_assert(c) gcc_checking_assert (c)
30 /* The parameter used to prevent infinite reloading for an insn. Each
31 insn operands might require a reload and, if it is a memory, its
32 base and index registers might require a reload too. */
33 #define LRA_MAX_INSN_RELOADS (MAX_RECOG_OPERANDS * 3)
35 /* Return the hard register which given pseudo REGNO assigned to.
36 Negative value means that the register got memory or we don't know
39 lra_get_regno_hard_regno (int regno
)
42 return reg_renumber
[regno
];
45 typedef struct lra_live_range
*lra_live_range_t
;
47 /* The structure describes program points where a given pseudo lives.
48 The live ranges can be used to find conflicts with other pseudos.
49 If the live ranges of two pseudos are intersected, the pseudos are
53 /* Pseudo regno whose live range is described by given
56 /* Program point range. */
58 /* Next structure describing program points where the pseudo
60 lra_live_range_t next
;
61 /* Pointer to structures with the same start. */
62 lra_live_range_t start_next
;
65 typedef struct lra_copy
*lra_copy_t
;
67 /* Copy between pseudos which affects assigning hard registers. */
70 /* True if regno1 is the destination of the copy. */
72 /* Execution frequency of the copy. */
74 /* Pseudos connected by the copy. REGNO1 < REGNO2. */
76 /* Next copy with correspondingly REGNO1 and REGNO2. */
77 lra_copy_t regno1_next
, regno2_next
;
80 /* Common info about a register (pseudo or hard register). */
83 /* Bitmap of UIDs of insns (including debug insns) referring the
85 bitmap_head insn_bitmap
;
86 /* The following fields are defined only for pseudos. */
87 /* Hard registers with which the pseudo conflicts. */
88 HARD_REG_SET conflict_hard_regs
;
89 /* We assign hard registers to reload pseudos which can occur in few
90 places. So two hard register preferences are enough for them.
91 The following fields define the preferred hard registers. If
92 there are no such hard registers the first field value is
93 negative. If there is only one preferred hard register, the 2nd
95 int preferred_hard_regno1
, preferred_hard_regno2
;
96 /* Profits to use the corresponding preferred hard registers. If
97 the both hard registers defined, the first hard register has not
98 less profit than the second one. */
99 int preferred_hard_regno_profit1
, preferred_hard_regno_profit2
;
101 /* True if the pseudo should not be assigned to a stack register. */
104 #ifdef ENABLE_CHECKING
105 /* True if the pseudo crosses a call. It is setup in lra-lives.c
106 and used to check that the pseudo crossing a call did not get a
107 call used hard register. */
110 /* Number of references and execution frequencies of the register in
111 *non-debug* insns. */
114 /* Regno used to undo the inheritance. It can be non-zero only
115 between couple of inheritance and undo inheritance passes. */
117 /* Value holding by register. If the pseudos have the same value
118 they do not conflict. */
120 /* These members are set up in lra-lives.c and updated in
122 /* The biggest size mode in which each pseudo reg is referred in
123 whole function (possibly via subreg). */
124 enum machine_mode biggest_mode
;
125 /* Live ranges of the pseudo. */
126 lra_live_range_t live_ranges
;
127 /* This member is set up in lra-lives.c for subsequent
132 /* References to the common info about each register. */
133 extern struct lra_reg
*lra_reg_info
;
135 /* Static info about each insn operand (common for all insns with the
136 same ICODE). Warning: if the structure definition is changed, the
137 initializer for debug_operand_data in lra.c should be changed
139 struct lra_operand_data
141 /* The machine description constraint string of the operand. */
142 const char *constraint
;
143 /* It is taken only from machine description (which is different
144 from recog_data.operand_mode) and can be of VOIDmode. */
145 ENUM_BITFIELD(machine_mode
) mode
: 16;
146 /* The type of the operand (in/out/inout). */
147 ENUM_BITFIELD (op_type
) type
: 8;
148 /* Through if accessed through STRICT_LOW. */
149 unsigned int strict_low
: 1;
150 /* True if the operand is an operator. */
151 unsigned int is_operator
: 1;
152 /* True if there is an early clobber alternative for this operand.
153 This field is set up every time when corresponding
154 operand_alternative in lra_static_insn_data is set up. */
155 unsigned int early_clobber
: 1;
156 /* True if the operand is an address. */
157 unsigned int is_address
: 1;
160 /* Info about register occurrence in an insn. */
163 /* The biggest mode through which the insn refers to the register
164 occurrence (remember the register can be accessed through a
165 subreg in the insn). */
166 ENUM_BITFIELD(machine_mode
) biggest_mode
: 16;
167 /* The type of the corresponding operand which is the register. */
168 ENUM_BITFIELD (op_type
) type
: 8;
169 /* True if the reg is accessed through a subreg and the subreg is
170 just a part of the register. */
171 unsigned int subreg_p
: 1;
172 /* True if there is an early clobber alternative for this
174 unsigned int early_clobber
: 1;
175 /* The corresponding regno of the register. */
177 /* Next reg info of the same insn. */
178 struct lra_insn_reg
*next
;
181 /* Static part (common info for insns with the same ICODE) of LRA
182 internal insn info. It exists in at most one exemplar for each
183 non-negative ICODE. There is only one exception. Each asm insn has
184 own structure. Warning: if the structure definition is changed,
185 the initializer for debug_insn_static_data in lra.c should be
187 struct lra_static_insn_data
189 /* Static info about each insn operand. */
190 struct lra_operand_data
*operand
;
191 /* Each duplication refers to the number of the corresponding
192 operand which is duplicated. */
194 /* The number of an operand marked as commutative, -1 otherwise. */
196 /* Number of operands, duplications, and alternatives of the
201 /* Insns in machine description (or clobbers in asm) may contain
202 explicit hard regs which are not operands. The following list
203 describes such hard registers. */
204 struct lra_insn_reg
*hard_regs
;
205 /* Array [n_alternatives][n_operand] of static constraint info for
206 given operand in given alternative. This info can be changed if
207 the target reg info is changed. */
208 struct operand_alternative
*operand_alternative
;
211 /* LRA internal info about an insn (LRA internal insn
213 struct lra_insn_recog_data
217 /* The insn itself. */
219 /* Common data for insns with the same ICODE. Asm insns (their
220 ICODE is negative) do not share such structures. */
221 struct lra_static_insn_data
*insn_static_data
;
222 /* Two arrays of size correspondingly equal to the operand and the
223 duplication numbers: */
224 rtx
**operand_loc
; /* The operand locations, NULL if no operands. */
225 rtx
**dup_loc
; /* The dup locations, NULL if no dups. */
226 /* Number of hard registers implicitly used in given call insn. The
227 value can be NULL or points to array of the hard register numbers
228 ending with a negative value. */
230 #ifdef HAVE_ATTR_enabled
231 /* Alternative enabled for the insn. NULL for debug insns. */
232 bool *alternative_enabled_p
;
234 /* The alternative should be used for the insn, -1 if invalid, or we
235 should try to use any alternative, or the insn is a debug
237 int used_insn_alternative
;
238 /* The following member value is always NULL for a debug insn. */
239 struct lra_insn_reg
*regs
;
242 typedef struct lra_insn_recog_data
*lra_insn_recog_data_t
;
244 /* Whether the clobber is used temporary in LRA. */
245 #define LRA_TEMP_CLOBBER_P(x) \
246 (RTL_FLAG_CHECK1 ("TEMP_CLOBBER_P", (x), CLOBBER)->unchanging)
250 extern FILE *lra_dump_file
;
252 extern bool lra_reg_spill_p
;
254 extern HARD_REG_SET lra_no_alloc_regs
;
256 extern int lra_insn_recog_data_len
;
257 extern lra_insn_recog_data_t
*lra_insn_recog_data
;
259 extern int lra_curr_reload_num
;
261 extern void lra_push_insn (rtx
);
262 extern void lra_push_insn_by_uid (unsigned int);
263 extern void lra_push_insn_and_update_insn_regno_info (rtx
);
264 extern rtx
lra_pop_insn (void);
265 extern unsigned int lra_insn_stack_length (void);
267 extern rtx
lra_create_new_reg_with_unique_value (enum machine_mode
, rtx
,
268 enum reg_class
, const char *);
269 extern void lra_set_regno_unique_value (int);
270 extern void lra_invalidate_insn_data (rtx
);
271 extern void lra_set_insn_deleted (rtx
);
272 extern void lra_delete_dead_insn (rtx
);
273 extern void lra_emit_add (rtx
, rtx
, rtx
);
274 extern void lra_emit_move (rtx
, rtx
);
275 extern void lra_update_dups (lra_insn_recog_data_t
, signed char *);
277 extern void lra_process_new_insns (rtx
, rtx
, rtx
, const char *);
279 extern lra_insn_recog_data_t
lra_set_insn_recog_data (rtx
);
280 extern lra_insn_recog_data_t
lra_update_insn_recog_data (rtx
);
281 extern void lra_set_used_insn_alternative (rtx
, int);
282 extern void lra_set_used_insn_alternative_by_uid (int, int);
284 extern void lra_invalidate_insn_regno_info (rtx
);
285 extern void lra_update_insn_regno_info (rtx
);
286 extern struct lra_insn_reg
*lra_get_insn_regs (int);
288 extern void lra_free_copies (void);
289 extern void lra_create_copy (int, int, int);
290 extern lra_copy_t
lra_get_copy (int);
291 extern bool lra_former_scratch_p (int);
292 extern bool lra_former_scratch_operand_p (rtx
, int);
294 extern int lra_constraint_new_regno_start
;
295 extern bitmap_head lra_inheritance_pseudos
;
296 extern bitmap_head lra_split_regs
;
297 extern bitmap_head lra_optional_reload_pseudos
;
298 extern int lra_constraint_new_insn_uid_start
;
300 /* lra-constraints.c: */
302 extern int lra_constraint_offset (int, enum machine_mode
);
304 extern int lra_constraint_iter
;
305 extern int lra_constraint_iter_after_spill
;
306 extern bool lra_risky_transformations_p
;
307 extern int lra_inheritance_iter
;
308 extern int lra_undo_inheritance_iter
;
309 extern bool lra_constraints (bool);
310 extern void lra_constraints_init (void);
311 extern void lra_constraints_finish (void);
312 extern void lra_inheritance (void);
313 extern bool lra_undo_inheritance (void);
317 extern int lra_live_max_point
;
318 extern int *lra_point_freq
;
320 extern int lra_hard_reg_usage
[FIRST_PSEUDO_REGISTER
];
322 extern int lra_live_range_iter
;
323 extern void lra_create_live_ranges (bool);
324 extern lra_live_range_t
lra_copy_live_range_list (lra_live_range_t
);
325 extern lra_live_range_t
lra_merge_live_ranges (lra_live_range_t
,
327 extern bool lra_intersected_live_ranges_p (lra_live_range_t
,
329 extern void lra_print_live_range_list (FILE *, lra_live_range_t
);
330 extern void lra_debug_live_range_list (lra_live_range_t
);
331 extern void lra_debug_pseudo_live_ranges (int);
332 extern void lra_debug_live_ranges (void);
333 extern void lra_clear_live_ranges (void);
334 extern void lra_live_ranges_init (void);
335 extern void lra_live_ranges_finish (void);
336 extern void lra_setup_reload_pseudo_preferenced_hard_reg (int, int, int);
340 extern void lra_setup_reg_renumber (int, int, bool);
341 extern bool lra_assign (void);
344 /* lra-coalesce.c: */
346 extern int lra_coalesce_iter
;
347 extern bool lra_coalesce (void);
351 extern bool lra_need_for_spills_p (void);
352 extern void lra_spill (void);
353 extern void lra_final_code_change (void);
356 /* lra-elimination.c: */
358 extern void lra_debug_elim_table (void);
359 extern int lra_get_elimination_hard_regno (int);
360 extern rtx
lra_eliminate_regs_1 (rtx
, enum machine_mode
, bool, bool, bool);
361 extern void lra_eliminate (bool);
363 extern void lra_eliminate_reg_if_possible (rtx
*);
367 /* Update insn operands which are duplication of NOP operand. The
368 insn is represented by its LRA internal representation ID. */
370 lra_update_dup (lra_insn_recog_data_t id
, int nop
)
373 struct lra_static_insn_data
*static_id
= id
->insn_static_data
;
375 for (i
= 0; i
< static_id
->n_dups
; i
++)
376 if (static_id
->dup_num
[i
] == nop
)
377 *id
->dup_loc
[i
] = *id
->operand_loc
[nop
];
380 /* Process operator duplications in insn with ID. We do it after the
381 operands processing. Generally speaking, we could do this probably
382 simultaneously with operands processing because a common practice
383 is to enumerate the operators after their operands. */
385 lra_update_operator_dups (lra_insn_recog_data_t id
)
388 struct lra_static_insn_data
*static_id
= id
->insn_static_data
;
390 for (i
= 0; i
< static_id
->n_dups
; i
++)
392 int ndup
= static_id
->dup_num
[i
];
394 if (static_id
->operand
[ndup
].is_operator
)
395 *id
->dup_loc
[i
] = *id
->operand_loc
[ndup
];
399 /* Return info about INSN. Set up the info if it is not done yet. */
400 static inline lra_insn_recog_data_t
401 lra_get_insn_recog_data (rtx insn
)
403 lra_insn_recog_data_t data
;
404 unsigned int uid
= INSN_UID (insn
);
406 if (lra_insn_recog_data_len
> (int) uid
407 && (data
= lra_insn_recog_data
[uid
]) != NULL
)
409 /* Check that we did not change insn without updating the insn
411 lra_assert (data
->insn
== insn
412 && (INSN_CODE (insn
) < 0
413 || data
->icode
== INSN_CODE (insn
)));
416 return lra_set_insn_recog_data (insn
);
421 struct target_lra_int
423 /* Map INSN_UID -> the operand alternative data (NULL if unknown).
424 We assume that this data is valid until register info is changed
425 because classes in the data can be changed. */
426 struct operand_alternative
*x_op_alt_data
[LAST_INSN_CODE
];
429 extern struct target_lra_int default_target_lra_int
;
430 #if SWITCHABLE_TARGET
431 extern struct target_lra_int
*this_target_lra_int
;
433 #define this_target_lra_int (&default_target_lra_int)
436 #define op_alt_data (this_target_lra_int->x_op_alt_data)