1 /* Local Register Allocator (LRA) intercommunication header file.
2 Copyright (C) 2010-2015 Free Software Foundation, Inc.
3 Contributed by Vladimir Makarov <vmakarov@redhat.com>.
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 3, or (at your option) any later
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
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
27 #include "insn-attr.h"
28 #include "insn-codes.h"
29 #include "insn-config.h"
32 #define lra_assert(c) gcc_checking_assert (c)
34 /* The parameter used to prevent infinite reloading for an insn. Each
35 insn operands might require a reload and, if it is a memory, its
36 base and index registers might require a reload too. */
37 #define LRA_MAX_INSN_RELOADS (MAX_RECOG_OPERANDS * 3)
39 typedef struct lra_live_range
*lra_live_range_t
;
41 /* The structure describes program points where a given pseudo lives.
42 The live ranges can be used to find conflicts with other pseudos.
43 If the live ranges of two pseudos are intersected, the pseudos are
47 /* Pseudo regno whose live range is described by given
50 /* Program point range. */
52 /* Next structure describing program points where the pseudo
54 lra_live_range_t next
;
55 /* Pointer to structures with the same start. */
56 lra_live_range_t start_next
;
59 typedef struct lra_copy
*lra_copy_t
;
61 /* Copy between pseudos which affects assigning hard registers. */
64 /* True if regno1 is the destination of the copy. */
66 /* Execution frequency of the copy. */
68 /* Pseudos connected by the copy. REGNO1 < REGNO2. */
70 /* Next copy with correspondingly REGNO1 and REGNO2. */
71 lra_copy_t regno1_next
, regno2_next
;
74 /* Common info about a register (pseudo or hard register). */
77 /* Bitmap of UIDs of insns (including debug insns) referring the
79 bitmap_head insn_bitmap
;
80 /* The following fields are defined only for pseudos. */
81 /* Hard registers with which the pseudo conflicts. */
82 HARD_REG_SET conflict_hard_regs
;
83 /* Call used registers with which the pseudo conflicts, taking into account
84 the registers used by functions called from calls which cross the
86 HARD_REG_SET actual_call_used_reg_set
;
87 /* We assign hard registers to reload pseudos which can occur in few
88 places. So two hard register preferences are enough for them.
89 The following fields define the preferred hard registers. If
90 there are no such hard registers the first field value is
91 negative. If there is only one preferred hard register, the 2nd
93 int preferred_hard_regno1
, preferred_hard_regno2
;
94 /* Profits to use the corresponding preferred hard registers. If
95 the both hard registers defined, the first hard register has not
96 less profit than the second one. */
97 int preferred_hard_regno_profit1
, preferred_hard_regno_profit2
;
99 /* True if the pseudo should not be assigned to a stack register. */
102 #ifdef ENABLE_CHECKING
103 /* True if the pseudo crosses a call. It is setup in lra-lives.c
104 and used to check that the pseudo crossing a call did not get a
105 call used hard register. */
108 /* Number of references and execution frequencies of the register in
109 *non-debug* insns. */
112 /* Regno used to undo the inheritance. It can be non-zero only
113 between couple of inheritance and undo inheritance passes. */
115 /* Value holding by register. If the pseudos have the same value
116 they do not conflict. */
118 /* Offset from relative eliminate register to pesudo reg. */
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 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 const struct operand_alternative
*operand_alternative
;
211 /* LRA internal info about an insn (LRA internal insn
213 struct lra_insn_recog_data
217 /* The alternative should be used for the insn, -1 if invalid, or we
218 should try to use any alternative, or the insn is a debug
220 int used_insn_alternative
;
221 /* SP offset before the insn relative to one at the func start. */
222 HOST_WIDE_INT sp_offset
;
223 /* The insn itself. */
225 /* Common data for insns with the same ICODE. Asm insns (their
226 ICODE is negative) do not share such structures. */
227 struct lra_static_insn_data
*insn_static_data
;
228 /* Two arrays of size correspondingly equal to the operand and the
229 duplication numbers: */
230 rtx
**operand_loc
; /* The operand locations, NULL if no operands. */
231 rtx
**dup_loc
; /* The dup locations, NULL if no dups. */
232 /* Number of hard registers implicitly used in given call insn. The
233 value can be NULL or points to array of the hard register numbers
234 ending with a negative value. */
236 /* Cached value of get_preferred_alternatives. */
237 alternative_mask preferred_alternatives
;
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)
248 /* Cost factor for each additional reload and maximal cost reject for
249 insn reloads. One might ask about such strange numbers. Their
250 values occurred historically from former reload pass. */
251 #define LRA_LOSER_COST_FACTOR 6
252 #define LRA_MAX_REJECT 600
254 /* Maximum allowed number of assignment pass iterations after the
255 latest spill pass when any former reload pseudo was spilled. It is
256 for preventing LRA cycling in a bug case. */
257 #define LRA_MAX_ASSIGNMENT_ITERATION_NUMBER 30
259 /* The maximal number of inheritance/split passes in LRA. It should
260 be more 1 in order to perform caller saves transformations and much
261 less MAX_CONSTRAINT_ITERATION_NUMBER to prevent LRA to do as many
262 as permitted constraint passes in some complicated cases. The
263 first inheritance/split pass has a biggest impact on generated code
264 quality. Each subsequent affects generated code in less degree.
265 For example, the 3rd pass does not change generated SPEC2000 code
267 #define LRA_MAX_INHERITANCE_PASSES 2
269 #if LRA_MAX_INHERITANCE_PASSES <= 0 \
270 || LRA_MAX_INHERITANCE_PASSES >= LRA_MAX_ASSIGNMENT_ITERATION_NUMBER - 8
271 #error wrong LRA_MAX_INHERITANCE_PASSES value
274 /* Analogous macro to the above one but for rematerialization. */
275 #define LRA_MAX_REMATERIALIZATION_PASSES 2
277 #if LRA_MAX_REMATERIALIZATION_PASSES <= 0 \
278 || LRA_MAX_REMATERIALIZATION_PASSES >= LRA_MAX_ASSIGNMENT_ITERATION_NUMBER - 8
279 #error wrong LRA_MAX_REMATERIALIZATION_PASSES value
284 extern FILE *lra_dump_file
;
286 extern bool lra_reg_spill_p
;
288 extern HARD_REG_SET lra_no_alloc_regs
;
290 extern int lra_insn_recog_data_len
;
291 extern lra_insn_recog_data_t
*lra_insn_recog_data
;
293 extern int lra_curr_reload_num
;
295 extern void lra_dump_bitmap_with_title (const char *, bitmap
, int);
296 extern void lra_push_insn (rtx_insn
*);
297 extern void lra_push_insn_by_uid (unsigned int);
298 extern void lra_push_insn_and_update_insn_regno_info (rtx_insn
*);
299 extern rtx_insn
*lra_pop_insn (void);
300 extern unsigned int lra_insn_stack_length (void);
302 extern rtx
lra_create_new_reg_with_unique_value (machine_mode
, rtx
,
303 enum reg_class
, const char *);
304 extern void lra_set_regno_unique_value (int);
305 extern void lra_invalidate_insn_data (rtx_insn
*);
306 extern void lra_set_insn_deleted (rtx_insn
*);
307 extern void lra_delete_dead_insn (rtx_insn
*);
308 extern void lra_emit_add (rtx
, rtx
, rtx
);
309 extern void lra_emit_move (rtx
, rtx
);
310 extern void lra_update_dups (lra_insn_recog_data_t
, signed char *);
312 extern void lra_process_new_insns (rtx_insn
*, rtx_insn
*, rtx_insn
*,
315 extern bool lra_substitute_pseudo (rtx
*, int, rtx
);
316 extern bool lra_substitute_pseudo_within_insn (rtx_insn
*, int, rtx
);
318 extern lra_insn_recog_data_t
lra_set_insn_recog_data (rtx_insn
*);
319 extern lra_insn_recog_data_t
lra_update_insn_recog_data (rtx_insn
*);
320 extern void lra_set_used_insn_alternative (rtx_insn
*, int);
321 extern void lra_set_used_insn_alternative_by_uid (int, int);
323 extern void lra_invalidate_insn_regno_info (rtx_insn
*);
324 extern void lra_update_insn_regno_info (rtx_insn
*);
325 extern struct lra_insn_reg
*lra_get_insn_regs (int);
327 extern void lra_free_copies (void);
328 extern void lra_create_copy (int, int, int);
329 extern lra_copy_t
lra_get_copy (int);
330 extern bool lra_former_scratch_p (int);
331 extern bool lra_former_scratch_operand_p (rtx_insn
*, int);
332 extern void lra_register_new_scratch_op (rtx_insn
*, int);
334 extern int lra_new_regno_start
;
335 extern int lra_constraint_new_regno_start
;
336 extern bitmap_head lra_inheritance_pseudos
;
337 extern bitmap_head lra_split_regs
;
338 extern bitmap_head lra_subreg_reload_pseudos
;
339 extern bitmap_head lra_optional_reload_pseudos
;
341 /* lra-constraints.c: */
343 extern void lra_init_equiv (void);
344 extern int lra_constraint_offset (int, machine_mode
);
346 extern int lra_constraint_iter
;
347 extern bool lra_risky_transformations_p
;
348 extern int lra_inheritance_iter
;
349 extern int lra_undo_inheritance_iter
;
350 extern bool lra_constrain_insn (rtx_insn
*);
351 extern bool lra_constraints (bool);
352 extern void lra_constraints_init (void);
353 extern void lra_constraints_finish (void);
354 extern void lra_inheritance (void);
355 extern bool lra_undo_inheritance (void);
359 extern int lra_live_max_point
;
360 extern int *lra_point_freq
;
362 extern int lra_hard_reg_usage
[FIRST_PSEUDO_REGISTER
];
364 extern int lra_live_range_iter
;
365 extern void lra_create_live_ranges (bool, bool);
366 extern lra_live_range_t
lra_copy_live_range_list (lra_live_range_t
);
367 extern lra_live_range_t
lra_merge_live_ranges (lra_live_range_t
,
369 extern bool lra_intersected_live_ranges_p (lra_live_range_t
,
371 extern void lra_print_live_range_list (FILE *, lra_live_range_t
);
372 extern void debug (lra_live_range
&ref
);
373 extern void debug (lra_live_range
*ptr
);
374 extern void lra_debug_live_range_list (lra_live_range_t
);
375 extern void lra_debug_pseudo_live_ranges (int);
376 extern void lra_debug_live_ranges (void);
377 extern void lra_clear_live_ranges (void);
378 extern void lra_live_ranges_init (void);
379 extern void lra_live_ranges_finish (void);
380 extern void lra_setup_reload_pseudo_preferenced_hard_reg (int, int, int);
384 extern int lra_assignment_iter
;
385 extern int lra_assignment_iter_after_spill
;
386 extern void lra_setup_reg_renumber (int, int, bool);
387 extern bool lra_assign (void);
390 /* lra-coalesce.c: */
392 extern int lra_coalesce_iter
;
393 extern bool lra_coalesce (void);
397 extern bool lra_need_for_spills_p (void);
398 extern void lra_spill (void);
399 extern void lra_final_code_change (void);
403 extern int lra_rematerialization_iter
;
404 extern bool lra_remat (void);
406 /* lra-elimination.c: */
408 extern void lra_debug_elim_table (void);
409 extern int lra_get_elimination_hard_regno (int);
410 extern rtx
lra_eliminate_regs_1 (rtx_insn
*, rtx
, machine_mode
,
411 bool, bool, HOST_WIDE_INT
, bool);
412 extern void eliminate_regs_in_insn (rtx_insn
*insn
, bool, bool, HOST_WIDE_INT
);
413 extern void lra_eliminate (bool, bool);
415 extern void lra_eliminate_reg_if_possible (rtx
*);
419 /* Return the hard register which given pseudo REGNO assigned to.
420 Negative value means that the register got memory or we don't know
423 lra_get_regno_hard_regno (int regno
)
426 return reg_renumber
[regno
];
429 /* Change class of pseudo REGNO to NEW_CLASS. Print info about it
430 using TITLE. Output a new line if NL_P. */
432 lra_change_class (int regno
, enum reg_class new_class
,
433 const char *title
, bool nl_p
)
435 lra_assert (regno
>= FIRST_PSEUDO_REGISTER
);
436 if (lra_dump_file
!= NULL
)
437 fprintf (lra_dump_file
, "%s class %s for r%d",
438 title
, reg_class_names
[new_class
], regno
);
439 setup_reg_classes (regno
, new_class
, NO_REGS
, new_class
);
440 if (lra_dump_file
!= NULL
&& nl_p
)
441 fprintf (lra_dump_file
, "\n");
444 /* Update insn operands which are duplication of NOP operand. The
445 insn is represented by its LRA internal representation ID. */
447 lra_update_dup (lra_insn_recog_data_t id
, int nop
)
450 struct lra_static_insn_data
*static_id
= id
->insn_static_data
;
452 for (i
= 0; i
< static_id
->n_dups
; i
++)
453 if (static_id
->dup_num
[i
] == nop
)
454 *id
->dup_loc
[i
] = *id
->operand_loc
[nop
];
457 /* Process operator duplications in insn with ID. We do it after the
458 operands processing. Generally speaking, we could do this probably
459 simultaneously with operands processing because a common practice
460 is to enumerate the operators after their operands. */
462 lra_update_operator_dups (lra_insn_recog_data_t id
)
465 struct lra_static_insn_data
*static_id
= id
->insn_static_data
;
467 for (i
= 0; i
< static_id
->n_dups
; i
++)
469 int ndup
= static_id
->dup_num
[i
];
471 if (static_id
->operand
[ndup
].is_operator
)
472 *id
->dup_loc
[i
] = *id
->operand_loc
[ndup
];
476 /* Return info about INSN. Set up the info if it is not done yet. */
477 static inline lra_insn_recog_data_t
478 lra_get_insn_recog_data (rtx_insn
*insn
)
480 lra_insn_recog_data_t data
;
481 unsigned int uid
= INSN_UID (insn
);
483 if (lra_insn_recog_data_len
> (int) uid
484 && (data
= lra_insn_recog_data
[uid
]) != NULL
)
486 /* Check that we did not change insn without updating the insn
488 lra_assert (data
->insn
== insn
489 && (INSN_CODE (insn
) < 0
490 || data
->icode
== INSN_CODE (insn
)));
493 return lra_set_insn_recog_data (insn
);
496 /* Update offset from pseudos with VAL by INCR. */
498 lra_update_reg_val_offset (int val
, int incr
)
502 for (i
= FIRST_PSEUDO_REGISTER
; i
< max_reg_num (); i
++)
504 if (lra_reg_info
[i
].val
== val
)
505 lra_reg_info
[i
].offset
+= incr
;
509 /* Return true if register content is equal to VAL with OFFSET. */
511 lra_reg_val_equal_p (int regno
, int val
, int offset
)
513 if (lra_reg_info
[regno
].val
== val
514 && lra_reg_info
[regno
].offset
== offset
)
520 /* Assign value of register FROM to TO. */
522 lra_assign_reg_val (int from
, int to
)
524 lra_reg_info
[to
].val
= lra_reg_info
[from
].val
;
525 lra_reg_info
[to
].offset
= lra_reg_info
[from
].offset
;
528 #endif /* GCC_LRA_INT_H */