1 /* Search an insn for pseudo regs that must be in hard regs and are not.
2 Copyright (C) 1987, 88, 89, 92-97, 1998 Free Software Foundation, Inc.
4 This file is part of GNU CC.
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)
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.
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
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* This file contains subroutines used only from the file reload1.c.
23 It knows how to scan one insn for operands and values
24 that need to be copied into registers to make valid code.
25 It also finds other operands and values which are valid
26 but for which equivalent values in registers exist and
27 ought to be used instead.
29 Before processing the first insn of the function, call `init_reload'.
31 To scan an insn, call `find_reloads'. This does two things:
32 1. sets up tables describing which values must be reloaded
33 for this insn, and what kind of hard regs they must be reloaded into;
34 2. optionally record the locations where those values appear in
35 the data, so they can be replaced properly later.
36 This is done only if the second arg to `find_reloads' is nonzero.
38 The third arg to `find_reloads' specifies the number of levels
39 of indirect addressing supported by the machine. If it is zero,
40 indirect addressing is not valid. If it is one, (MEM (REG n))
41 is valid even if (REG n) did not get a hard register; if it is two,
42 (MEM (MEM (REG n))) is also valid even if (REG n) did not get a
43 hard register, and similarly for higher values.
45 Then you must choose the hard regs to reload those pseudo regs into,
46 and generate appropriate load insns before this insn and perhaps
47 also store insns after this insn. Set up the array `reload_reg_rtx'
48 to contain the REG rtx's for the registers you used. In some
49 cases `find_reloads' will return a nonzero value in `reload_reg_rtx'
50 for certain reloads. Then that tells you which register to use,
51 so you do not need to allocate one. But you still do need to add extra
52 instructions to copy the value into and out of that register.
54 Finally you must call `subst_reloads' to substitute the reload reg rtx's
55 into the locations already recorded.
59 find_reloads can alter the operands of the instruction it is called on.
61 1. Two operands of any sort may be interchanged, if they are in a
62 commutative instruction.
63 This happens only if find_reloads thinks the instruction will compile
66 2. Pseudo-registers that are equivalent to constants are replaced
67 with those constants if they are not in hard registers.
69 1 happens every time find_reloads is called.
70 2 happens only when REPLACE is 1, which is only when
71 actually doing the reloads, not when just counting them.
74 Using a reload register for several reloads in one insn:
76 When an insn has reloads, it is considered as having three parts:
77 the input reloads, the insn itself after reloading, and the output reloads.
78 Reloads of values used in memory addresses are often needed for only one part.
80 When this is so, reload_when_needed records which part needs the reload.
81 Two reloads for different parts of the insn can share the same reload
84 When a reload is used for addresses in multiple parts, or when it is
85 an ordinary operand, it is classified as RELOAD_OTHER, and cannot share
86 a register with any other reload. */
93 #include "insn-config.h"
94 #include "insn-codes.h"
98 #include "hard-reg-set.h"
105 #ifndef REGISTER_MOVE_COST
106 #define REGISTER_MOVE_COST(x, y) 2
109 #ifndef REGNO_MODE_OK_FOR_BASE_P
110 #define REGNO_MODE_OK_FOR_BASE_P(REGNO, MODE) REGNO_OK_FOR_BASE_P (REGNO)
113 #ifndef REG_MODE_OK_FOR_BASE_P
114 #define REG_MODE_OK_FOR_BASE_P(REGNO, MODE) REG_OK_FOR_BASE_P (REGNO)
117 /* The variables set up by `find_reloads' are:
119 n_reloads number of distinct reloads needed; max reload # + 1
120 tables indexed by reload number
121 reload_in rtx for value to reload from
122 reload_out rtx for where to store reload-reg afterward if nec
123 (often the same as reload_in)
124 reload_reg_class enum reg_class, saying what regs to reload into
125 reload_inmode enum machine_mode; mode this operand should have
126 when reloaded, on input.
127 reload_outmode enum machine_mode; mode this operand should have
128 when reloaded, on output.
129 reload_optional char, nonzero for an optional reload.
130 Optional reloads are ignored unless the
131 value is already sitting in a register.
132 reload_nongroup char, nonzero when a reload must use a register
133 not already allocated to a group.
134 reload_inc int, positive amount to increment or decrement by if
135 reload_in is a PRE_DEC, PRE_INC, POST_DEC, POST_INC.
136 Ignored otherwise (don't assume it is zero).
137 reload_in_reg rtx. A reg for which reload_in is the equivalent.
138 If reload_in is a symbol_ref which came from
139 reg_equiv_constant, then this is the pseudo
140 which has that symbol_ref as equivalent.
141 reload_reg_rtx rtx. This is the register to reload into.
142 If it is zero when `find_reloads' returns,
143 you must find a suitable register in the class
144 specified by reload_reg_class, and store here
145 an rtx for that register with mode from
146 reload_inmode or reload_outmode.
147 reload_nocombine char, nonzero if this reload shouldn't be
148 combined with another reload.
149 reload_opnum int, operand number being reloaded. This is
150 used to group related reloads and need not always
151 be equal to the actual operand number in the insn,
152 though it current will be; for in-out operands, it
153 is one of the two operand numbers.
154 reload_when_needed enum, classifies reload as needed either for
155 addressing an input reload, addressing an output,
156 for addressing a non-reloaded mem ref,
157 or for unspecified purposes (i.e., more than one
159 reload_secondary_p int, 1 if this is a secondary register for one
161 reload_secondary_in_reload
162 reload_secondary_out_reload
163 int, gives the reload number of a secondary
164 reload, when needed; otherwise -1
165 reload_secondary_in_icode
166 reload_secondary_out_icode
167 enum insn_code, if a secondary reload is required,
168 gives the INSN_CODE that uses the secondary
169 reload as a scratch register, or CODE_FOR_nothing
170 if the secondary reload register is to be an
171 intermediate register. */
174 rtx reload_in[MAX_RELOADS];
175 rtx reload_out[MAX_RELOADS];
176 enum reg_class reload_reg_class[MAX_RELOADS];
177 enum machine_mode reload_inmode[MAX_RELOADS];
178 enum machine_mode reload_outmode[MAX_RELOADS];
179 rtx reload_reg_rtx[MAX_RELOADS];
180 char reload_optional[MAX_RELOADS];
181 char reload_nongroup[MAX_RELOADS];
182 int reload_inc[MAX_RELOADS];
183 rtx reload_in_reg[MAX_RELOADS];
184 char reload_nocombine[MAX_RELOADS];
185 int reload_opnum[MAX_RELOADS];
186 enum reload_type reload_when_needed[MAX_RELOADS];
187 int reload_secondary_p[MAX_RELOADS];
188 int reload_secondary_in_reload[MAX_RELOADS];
189 int reload_secondary_out_reload[MAX_RELOADS];
190 enum insn_code reload_secondary_in_icode[MAX_RELOADS];
191 enum insn_code reload_secondary_out_icode[MAX_RELOADS];
193 /* All the "earlyclobber" operands of the current insn
194 are recorded here. */
196 rtx reload_earlyclobbers[MAX_RECOG_OPERANDS];
198 int reload_n_operands;
200 /* Replacing reloads.
202 If `replace_reloads' is nonzero, then as each reload is recorded
203 an entry is made for it in the table `replacements'.
204 Then later `subst_reloads' can look through that table and
205 perform all the replacements needed. */
207 /* Nonzero means record the places to replace. */
208 static int replace_reloads;
210 /* Each replacement is recorded with a structure like this. */
213 rtx *where; /* Location to store in */
214 rtx *subreg_loc; /* Location of SUBREG if WHERE is inside
215 a SUBREG; 0 otherwise. */
216 int what; /* which reload this is for */
217 enum machine_mode mode; /* mode it must have */
220 static struct replacement replacements[MAX_RECOG_OPERANDS * ((MAX_REGS_PER_ADDRESS * 2) + 1)];
222 /* Number of replacements currently recorded. */
223 static int n_replacements;
225 /* Used to track what is modified by an operand. */
228 int reg_flag; /* Nonzero if referencing a register. */
229 int safe; /* Nonzero if this can't conflict with anything. */
230 rtx base; /* Base address for MEM. */
231 HOST_WIDE_INT start; /* Starting offset or register number. */
232 HOST_WIDE_INT end; /* Ending offset or register number. */
235 /* MEM-rtx's created for pseudo-regs in stack slots not directly addressable;
236 (see reg_equiv_address). */
237 static rtx memlocs[MAX_RECOG_OPERANDS * ((MAX_REGS_PER_ADDRESS * 2) + 1)];
238 static int n_memlocs;
240 #ifdef SECONDARY_MEMORY_NEEDED
242 /* Save MEMs needed to copy from one class of registers to another. One MEM
243 is used per mode, but normally only one or two modes are ever used.
245 We keep two versions, before and after register elimination. The one
246 after register elimination is record separately for each operand. This
247 is done in case the address is not valid to be sure that we separately
250 static rtx secondary_memlocs[NUM_MACHINE_MODES];
251 static rtx secondary_memlocs_elim[NUM_MACHINE_MODES][MAX_RECOG_OPERANDS];
254 /* The instruction we are doing reloads for;
255 so we can test whether a register dies in it. */
256 static rtx this_insn;
258 /* Nonzero if this instruction is a user-specified asm with operands. */
259 static int this_insn_is_asm;
261 /* If hard_regs_live_known is nonzero,
262 we can tell which hard regs are currently live,
263 at least enough to succeed in choosing dummy reloads. */
264 static int hard_regs_live_known;
266 /* Indexed by hard reg number,
267 element is nonnegative if hard reg has been spilled.
268 This vector is passed to `find_reloads' as an argument
269 and is not changed here. */
270 static short *static_reload_reg_p;
272 /* Set to 1 in subst_reg_equivs if it changes anything. */
273 static int subst_reg_equivs_changed;
275 /* On return from push_reload, holds the reload-number for the OUT
276 operand, which can be different for that from the input operand. */
277 static int output_reloadnum;
279 /* Compare two RTX's. */
280 #define MATCHES(x, y) \
281 (x == y || (x != 0 && (GET_CODE (x) == REG \
282 ? GET_CODE (y) == REG && REGNO (x) == REGNO (y) \
283 : rtx_equal_p (x, y) && ! side_effects_p (x))))
285 /* Indicates if two reloads purposes are for similar enough things that we
286 can merge their reloads. */
287 #define MERGABLE_RELOADS(when1, when2, op1, op2) \
288 ((when1) == RELOAD_OTHER || (when2) == RELOAD_OTHER \
289 || ((when1) == (when2) && (op1) == (op2)) \
290 || ((when1) == RELOAD_FOR_INPUT && (when2) == RELOAD_FOR_INPUT) \
291 || ((when1) == RELOAD_FOR_OPERAND_ADDRESS \
292 && (when2) == RELOAD_FOR_OPERAND_ADDRESS) \
293 || ((when1) == RELOAD_FOR_OTHER_ADDRESS \
294 && (when2) == RELOAD_FOR_OTHER_ADDRESS))
296 /* Nonzero if these two reload purposes produce RELOAD_OTHER when merged. */
297 #define MERGE_TO_OTHER(when1, when2, op1, op2) \
298 ((when1) != (when2) \
299 || ! ((op1) == (op2) \
300 || (when1) == RELOAD_FOR_INPUT \
301 || (when1) == RELOAD_FOR_OPERAND_ADDRESS \
302 || (when1) == RELOAD_FOR_OTHER_ADDRESS))
304 /* If we are going to reload an address, compute the reload type to
306 #define ADDR_TYPE(type) \
307 ((type) == RELOAD_FOR_INPUT_ADDRESS \
308 ? RELOAD_FOR_INPADDR_ADDRESS \
309 : ((type) == RELOAD_FOR_OUTPUT_ADDRESS \
310 ? RELOAD_FOR_OUTADDR_ADDRESS \
313 #ifdef HAVE_SECONDARY_RELOADS
314 static int push_secondary_reload PROTO((int, rtx, int, int, enum reg_class,
315 enum machine_mode, enum reload_type,
318 static enum reg_class find_valid_class PROTO((enum machine_mode, int));
319 static int push_reload PROTO((rtx, rtx, rtx *, rtx *, enum reg_class,
320 enum machine_mode, enum machine_mode,
321 int, int, int, enum reload_type));
322 static void push_replacement PROTO((rtx *, int, enum machine_mode));
323 static void combine_reloads PROTO((void));
324 static rtx find_dummy_reload PROTO((rtx, rtx, rtx *, rtx *,
325 enum machine_mode, enum machine_mode,
326 enum reg_class, int, int));
327 static int earlyclobber_operand_p PROTO((rtx));
328 static int hard_reg_set_here_p PROTO((int, int, rtx));
329 static struct decomposition decompose PROTO((rtx));
330 static int immune_p PROTO((rtx, rtx, struct decomposition));
331 static int alternative_allows_memconst PROTO((char *, int));
332 static rtx find_reloads_toplev PROTO((rtx, int, enum reload_type, int, int));
333 static rtx make_memloc PROTO((rtx, int));
334 static int find_reloads_address PROTO((enum machine_mode, rtx *, rtx, rtx *,
335 int, enum reload_type, int, rtx));
336 static rtx subst_reg_equivs PROTO((rtx));
337 static rtx subst_indexed_address PROTO((rtx));
338 static int find_reloads_address_1 PROTO((enum machine_mode, rtx, int, rtx *,
339 int, enum reload_type,int, rtx));
340 static void find_reloads_address_part PROTO((rtx, rtx *, enum reg_class,
341 enum machine_mode, int,
342 enum reload_type, int));
343 static int find_inc_amount PROTO((rtx, rtx));
345 #ifdef HAVE_SECONDARY_RELOADS
347 /* Determine if any secondary reloads are needed for loading (if IN_P is
348 non-zero) or storing (if IN_P is zero) X to or from a reload register of
349 register class RELOAD_CLASS in mode RELOAD_MODE. If secondary reloads
350 are needed, push them.
352 Return the reload number of the secondary reload we made, or -1 if
353 we didn't need one. *PICODE is set to the insn_code to use if we do
354 need a secondary reload. */
357 push_secondary_reload (in_p, x, opnum, optional, reload_class, reload_mode,
363 enum reg_class reload_class;
364 enum machine_mode reload_mode;
365 enum reload_type type;
366 enum insn_code *picode;
368 enum reg_class class = NO_REGS;
369 enum machine_mode mode = reload_mode;
370 enum insn_code icode = CODE_FOR_nothing;
371 enum reg_class t_class = NO_REGS;
372 enum machine_mode t_mode = VOIDmode;
373 enum insn_code t_icode = CODE_FOR_nothing;
374 enum reload_type secondary_type;
375 int s_reload, t_reload = -1;
377 if (type == RELOAD_FOR_INPUT_ADDRESS
378 || type == RELOAD_FOR_OUTPUT_ADDRESS
379 || type == RELOAD_FOR_INPADDR_ADDRESS
380 || type == RELOAD_FOR_OUTADDR_ADDRESS)
381 secondary_type = type;
383 secondary_type = in_p ? RELOAD_FOR_INPUT_ADDRESS : RELOAD_FOR_OUTPUT_ADDRESS;
385 *picode = CODE_FOR_nothing;
387 /* If X is a paradoxical SUBREG, use the inner value to determine both the
388 mode and object being reloaded. */
389 if (GET_CODE (x) == SUBREG
390 && (GET_MODE_SIZE (GET_MODE (x))
391 > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))))
394 reload_mode = GET_MODE (x);
397 /* If X is a pseudo-register that has an equivalent MEM (actually, if it
398 is still a pseudo-register by now, it *must* have an equivalent MEM
399 but we don't want to assume that), use that equivalent when seeing if
400 a secondary reload is needed since whether or not a reload is needed
401 might be sensitive to the form of the MEM. */
403 if (GET_CODE (x) == REG && REGNO (x) >= FIRST_PSEUDO_REGISTER
404 && reg_equiv_mem[REGNO (x)] != 0)
405 x = reg_equiv_mem[REGNO (x)];
407 #ifdef SECONDARY_INPUT_RELOAD_CLASS
409 class = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x);
412 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
414 class = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x);
417 /* If we don't need any secondary registers, done. */
418 if (class == NO_REGS)
421 /* Get a possible insn to use. If the predicate doesn't accept X, don't
424 icode = (in_p ? reload_in_optab[(int) reload_mode]
425 : reload_out_optab[(int) reload_mode]);
427 if (icode != CODE_FOR_nothing
428 && insn_operand_predicate[(int) icode][in_p]
429 && (! (insn_operand_predicate[(int) icode][in_p]) (x, reload_mode)))
430 icode = CODE_FOR_nothing;
432 /* If we will be using an insn, see if it can directly handle the reload
433 register we will be using. If it can, the secondary reload is for a
434 scratch register. If it can't, we will use the secondary reload for
435 an intermediate register and require a tertiary reload for the scratch
438 if (icode != CODE_FOR_nothing)
440 /* If IN_P is non-zero, the reload register will be the output in
441 operand 0. If IN_P is zero, the reload register will be the input
442 in operand 1. Outputs should have an initial "=", which we must
445 char insn_letter = insn_operand_constraint[(int) icode][!in_p][in_p];
446 enum reg_class insn_class
447 = (insn_letter == 'r' ? GENERAL_REGS
448 : REG_CLASS_FROM_LETTER (insn_letter));
450 if (insn_class == NO_REGS
451 || (in_p && insn_operand_constraint[(int) icode][!in_p][0] != '=')
452 /* The scratch register's constraint must start with "=&". */
453 || insn_operand_constraint[(int) icode][2][0] != '='
454 || insn_operand_constraint[(int) icode][2][1] != '&')
457 if (reg_class_subset_p (reload_class, insn_class))
458 mode = insn_operand_mode[(int) icode][2];
461 char t_letter = insn_operand_constraint[(int) icode][2][2];
463 t_mode = insn_operand_mode[(int) icode][2];
464 t_class = (t_letter == 'r' ? GENERAL_REGS
465 : REG_CLASS_FROM_LETTER (t_letter));
467 icode = CODE_FOR_nothing;
471 /* This case isn't valid, so fail. Reload is allowed to use the same
472 register for RELOAD_FOR_INPUT_ADDRESS and RELOAD_FOR_INPUT reloads, but
473 in the case of a secondary register, we actually need two different
474 registers for correct code. We fail here to prevent the possibility of
475 silently generating incorrect code later.
477 The convention is that secondary input reloads are valid only if the
478 secondary_class is different from class. If you have such a case, you
479 can not use secondary reloads, you must work around the problem some
482 Allow this when MODE is not reload_mode and assume that the generated
483 code handles this case (it does on the Alpha, which is the only place
484 this currently happens). */
486 if (in_p && class == reload_class && mode == reload_mode)
489 /* If we need a tertiary reload, see if we have one we can reuse or else
492 if (t_class != NO_REGS)
494 for (t_reload = 0; t_reload < n_reloads; t_reload++)
495 if (reload_secondary_p[t_reload]
496 && (reg_class_subset_p (t_class, reload_reg_class[t_reload])
497 || reg_class_subset_p (reload_reg_class[t_reload], t_class))
498 && ((in_p && reload_inmode[t_reload] == t_mode)
499 || (! in_p && reload_outmode[t_reload] == t_mode))
500 && ((in_p && (reload_secondary_in_icode[t_reload]
501 == CODE_FOR_nothing))
502 || (! in_p &&(reload_secondary_out_icode[t_reload]
503 == CODE_FOR_nothing)))
504 && (reg_class_size[(int) t_class] == 1 || SMALL_REGISTER_CLASSES)
505 && MERGABLE_RELOADS (secondary_type,
506 reload_when_needed[t_reload],
507 opnum, reload_opnum[t_reload]))
510 reload_inmode[t_reload] = t_mode;
512 reload_outmode[t_reload] = t_mode;
514 if (reg_class_subset_p (t_class, reload_reg_class[t_reload]))
515 reload_reg_class[t_reload] = t_class;
517 reload_opnum[t_reload] = MIN (reload_opnum[t_reload], opnum);
518 reload_optional[t_reload] &= optional;
519 reload_secondary_p[t_reload] = 1;
520 if (MERGE_TO_OTHER (secondary_type, reload_when_needed[t_reload],
521 opnum, reload_opnum[t_reload]))
522 reload_when_needed[t_reload] = RELOAD_OTHER;
525 if (t_reload == n_reloads)
527 /* We need to make a new tertiary reload for this register class. */
528 reload_in[t_reload] = reload_out[t_reload] = 0;
529 reload_reg_class[t_reload] = t_class;
530 reload_inmode[t_reload] = in_p ? t_mode : VOIDmode;
531 reload_outmode[t_reload] = ! in_p ? t_mode : VOIDmode;
532 reload_reg_rtx[t_reload] = 0;
533 reload_optional[t_reload] = optional;
534 reload_nongroup[t_reload] = 0;
535 reload_inc[t_reload] = 0;
536 /* Maybe we could combine these, but it seems too tricky. */
537 reload_nocombine[t_reload] = 1;
538 reload_in_reg[t_reload] = 0;
539 reload_opnum[t_reload] = opnum;
540 reload_when_needed[t_reload] = secondary_type;
541 reload_secondary_in_reload[t_reload] = -1;
542 reload_secondary_out_reload[t_reload] = -1;
543 reload_secondary_in_icode[t_reload] = CODE_FOR_nothing;
544 reload_secondary_out_icode[t_reload] = CODE_FOR_nothing;
545 reload_secondary_p[t_reload] = 1;
551 /* See if we can reuse an existing secondary reload. */
552 for (s_reload = 0; s_reload < n_reloads; s_reload++)
553 if (reload_secondary_p[s_reload]
554 && (reg_class_subset_p (class, reload_reg_class[s_reload])
555 || reg_class_subset_p (reload_reg_class[s_reload], class))
556 && ((in_p && reload_inmode[s_reload] == mode)
557 || (! in_p && reload_outmode[s_reload] == mode))
558 && ((in_p && reload_secondary_in_reload[s_reload] == t_reload)
559 || (! in_p && reload_secondary_out_reload[s_reload] == t_reload))
560 && ((in_p && reload_secondary_in_icode[s_reload] == t_icode)
561 || (! in_p && reload_secondary_out_icode[s_reload] == t_icode))
562 && (reg_class_size[(int) class] == 1 || SMALL_REGISTER_CLASSES)
563 && MERGABLE_RELOADS (secondary_type, reload_when_needed[s_reload],
564 opnum, reload_opnum[s_reload]))
567 reload_inmode[s_reload] = mode;
569 reload_outmode[s_reload] = mode;
571 if (reg_class_subset_p (class, reload_reg_class[s_reload]))
572 reload_reg_class[s_reload] = class;
574 reload_opnum[s_reload] = MIN (reload_opnum[s_reload], opnum);
575 reload_optional[s_reload] &= optional;
576 reload_secondary_p[s_reload] = 1;
577 if (MERGE_TO_OTHER (secondary_type, reload_when_needed[s_reload],
578 opnum, reload_opnum[s_reload]))
579 reload_when_needed[s_reload] = RELOAD_OTHER;
582 if (s_reload == n_reloads)
584 #ifdef SECONDARY_MEMORY_NEEDED
585 /* If we need a memory location to copy between the two reload regs,
586 set it up now. Note that we do the input case before making
587 the reload and the output case after. This is due to the
588 way reloads are output. */
590 if (in_p && icode == CODE_FOR_nothing
591 && SECONDARY_MEMORY_NEEDED (class, reload_class, mode))
592 get_secondary_mem (x, reload_mode, opnum, type);
595 /* We need to make a new secondary reload for this register class. */
596 reload_in[s_reload] = reload_out[s_reload] = 0;
597 reload_reg_class[s_reload] = class;
599 reload_inmode[s_reload] = in_p ? mode : VOIDmode;
600 reload_outmode[s_reload] = ! in_p ? mode : VOIDmode;
601 reload_reg_rtx[s_reload] = 0;
602 reload_optional[s_reload] = optional;
603 reload_nongroup[s_reload] = 0;
604 reload_inc[s_reload] = 0;
605 /* Maybe we could combine these, but it seems too tricky. */
606 reload_nocombine[s_reload] = 1;
607 reload_in_reg[s_reload] = 0;
608 reload_opnum[s_reload] = opnum;
609 reload_when_needed[s_reload] = secondary_type;
610 reload_secondary_in_reload[s_reload] = in_p ? t_reload : -1;
611 reload_secondary_out_reload[s_reload] = ! in_p ? t_reload : -1;
612 reload_secondary_in_icode[s_reload] = in_p ? t_icode : CODE_FOR_nothing;
613 reload_secondary_out_icode[s_reload]
614 = ! in_p ? t_icode : CODE_FOR_nothing;
615 reload_secondary_p[s_reload] = 1;
619 #ifdef SECONDARY_MEMORY_NEEDED
620 if (! in_p && icode == CODE_FOR_nothing
621 && SECONDARY_MEMORY_NEEDED (reload_class, class, mode))
622 get_secondary_mem (x, mode, opnum, type);
629 #endif /* HAVE_SECONDARY_RELOADS */
631 #ifdef SECONDARY_MEMORY_NEEDED
633 /* Return a memory location that will be used to copy X in mode MODE.
634 If we haven't already made a location for this mode in this insn,
635 call find_reloads_address on the location being returned. */
638 get_secondary_mem (x, mode, opnum, type)
640 enum machine_mode mode;
642 enum reload_type type;
647 /* By default, if MODE is narrower than a word, widen it to a word.
648 This is required because most machines that require these memory
649 locations do not support short load and stores from all registers
650 (e.g., FP registers). */
652 #ifdef SECONDARY_MEMORY_NEEDED_MODE
653 mode = SECONDARY_MEMORY_NEEDED_MODE (mode);
655 if (GET_MODE_BITSIZE (mode) < BITS_PER_WORD)
656 mode = mode_for_size (BITS_PER_WORD, GET_MODE_CLASS (mode), 0);
659 /* If we already have made a MEM for this operand in MODE, return it. */
660 if (secondary_memlocs_elim[(int) mode][opnum] != 0)
661 return secondary_memlocs_elim[(int) mode][opnum];
663 /* If this is the first time we've tried to get a MEM for this mode,
664 allocate a new one. `something_changed' in reload will get set
665 by noticing that the frame size has changed. */
667 if (secondary_memlocs[(int) mode] == 0)
669 #ifdef SECONDARY_MEMORY_NEEDED_RTX
670 secondary_memlocs[(int) mode] = SECONDARY_MEMORY_NEEDED_RTX (mode);
672 secondary_memlocs[(int) mode]
673 = assign_stack_local (mode, GET_MODE_SIZE (mode), 0);
677 /* Get a version of the address doing any eliminations needed. If that
678 didn't give us a new MEM, make a new one if it isn't valid. */
680 loc = eliminate_regs (secondary_memlocs[(int) mode], VOIDmode, NULL_RTX);
681 mem_valid = strict_memory_address_p (mode, XEXP (loc, 0));
683 if (! mem_valid && loc == secondary_memlocs[(int) mode])
684 loc = copy_rtx (loc);
686 /* The only time the call below will do anything is if the stack
687 offset is too large. In that case IND_LEVELS doesn't matter, so we
688 can just pass a zero. Adjust the type to be the address of the
689 corresponding object. If the address was valid, save the eliminated
690 address. If it wasn't valid, we need to make a reload each time, so
695 type = (type == RELOAD_FOR_INPUT ? RELOAD_FOR_INPUT_ADDRESS
696 : type == RELOAD_FOR_OUTPUT ? RELOAD_FOR_OUTPUT_ADDRESS
699 find_reloads_address (mode, NULL_PTR, XEXP (loc, 0), &XEXP (loc, 0),
703 secondary_memlocs_elim[(int) mode][opnum] = loc;
707 /* Clear any secondary memory locations we've made. */
710 clear_secondary_mem ()
712 bzero ((char *) secondary_memlocs, sizeof secondary_memlocs);
714 #endif /* SECONDARY_MEMORY_NEEDED */
716 /* Find the largest class for which every register number plus N is valid in
717 M1 (if in range). Abort if no such class exists. */
719 static enum reg_class
720 find_valid_class (m1, n)
721 enum machine_mode m1;
726 enum reg_class best_class;
729 for (class = 1; class < N_REG_CLASSES; class++)
732 for (regno = 0; regno < FIRST_PSEUDO_REGISTER && ! bad; regno++)
733 if (TEST_HARD_REG_BIT (reg_class_contents[class], regno)
734 && TEST_HARD_REG_BIT (reg_class_contents[class], regno + n)
735 && ! HARD_REGNO_MODE_OK (regno + n, m1))
738 if (! bad && reg_class_size[class] > best_size)
739 best_class = class, best_size = reg_class_size[class];
748 /* Record one reload that needs to be performed.
749 IN is an rtx saying where the data are to be found before this instruction.
750 OUT says where they must be stored after the instruction.
751 (IN is zero for data not read, and OUT is zero for data not written.)
752 INLOC and OUTLOC point to the places in the instructions where
753 IN and OUT were found.
754 If IN and OUT are both non-zero, it means the same register must be used
755 to reload both IN and OUT.
757 CLASS is a register class required for the reloaded data.
758 INMODE is the machine mode that the instruction requires
759 for the reg that replaces IN and OUTMODE is likewise for OUT.
761 If IN is zero, then OUT's location and mode should be passed as
764 STRICT_LOW is the 1 if there is a containing STRICT_LOW_PART rtx.
766 OPTIONAL nonzero means this reload does not need to be performed:
767 it can be discarded if that is more convenient.
769 OPNUM and TYPE say what the purpose of this reload is.
771 The return value is the reload-number for this reload.
773 If both IN and OUT are nonzero, in some rare cases we might
774 want to make two separate reloads. (Actually we never do this now.)
775 Therefore, the reload-number for OUT is stored in
776 output_reloadnum when we return; the return value applies to IN.
777 Usually (presently always), when IN and OUT are nonzero,
778 the two reload-numbers are equal, but the caller should be careful to
782 push_reload (in, out, inloc, outloc, class,
783 inmode, outmode, strict_low, optional, opnum, type)
784 register rtx in, out;
786 enum reg_class class;
787 enum machine_mode inmode, outmode;
791 enum reload_type type;
795 int dont_remove_subreg = 0;
796 rtx *in_subreg_loc = 0, *out_subreg_loc = 0;
797 int secondary_in_reload = -1, secondary_out_reload = -1;
798 enum insn_code secondary_in_icode = CODE_FOR_nothing;
799 enum insn_code secondary_out_icode = CODE_FOR_nothing;
801 /* INMODE and/or OUTMODE could be VOIDmode if no mode
802 has been specified for the operand. In that case,
803 use the operand's mode as the mode to reload. */
804 if (inmode == VOIDmode && in != 0)
805 inmode = GET_MODE (in);
806 if (outmode == VOIDmode && out != 0)
807 outmode = GET_MODE (out);
809 /* If IN is a pseudo register everywhere-equivalent to a constant, and
810 it is not in a hard register, reload straight from the constant,
811 since we want to get rid of such pseudo registers.
812 Often this is done earlier, but not always in find_reloads_address. */
813 if (in != 0 && GET_CODE (in) == REG)
815 register int regno = REGNO (in);
817 if (regno >= FIRST_PSEUDO_REGISTER && reg_renumber[regno] < 0
818 && reg_equiv_constant[regno] != 0)
819 in = reg_equiv_constant[regno];
822 /* Likewise for OUT. Of course, OUT will never be equivalent to
823 an actual constant, but it might be equivalent to a memory location
824 (in the case of a parameter). */
825 if (out != 0 && GET_CODE (out) == REG)
827 register int regno = REGNO (out);
829 if (regno >= FIRST_PSEUDO_REGISTER && reg_renumber[regno] < 0
830 && reg_equiv_constant[regno] != 0)
831 out = reg_equiv_constant[regno];
834 /* If we have a read-write operand with an address side-effect,
835 change either IN or OUT so the side-effect happens only once. */
836 if (in != 0 && out != 0 && GET_CODE (in) == MEM && rtx_equal_p (in, out))
838 if (GET_CODE (XEXP (in, 0)) == POST_INC
839 || GET_CODE (XEXP (in, 0)) == POST_DEC)
840 in = gen_rtx_MEM (GET_MODE (in), XEXP (XEXP (in, 0), 0));
841 if (GET_CODE (XEXP (in, 0)) == PRE_INC
842 || GET_CODE (XEXP (in, 0)) == PRE_DEC)
843 out = gen_rtx_MEM (GET_MODE (out), XEXP (XEXP (out, 0), 0));
846 /* If we are reloading a (SUBREG constant ...), really reload just the
847 inside expression in its own mode. Similarly for (SUBREG (PLUS ...)).
848 If we have (SUBREG:M1 (MEM:M2 ...) ...) (or an inner REG that is still
849 a pseudo and hence will become a MEM) with M1 wider than M2 and the
850 register is a pseudo, also reload the inside expression.
851 For machines that extend byte loads, do this for any SUBREG of a pseudo
852 where both M1 and M2 are a word or smaller, M1 is wider than M2, and
853 M2 is an integral mode that gets extended when loaded.
854 Similar issue for (SUBREG:M1 (REG:M2 ...) ...) for a hard register R where
855 either M1 is not valid for R or M2 is wider than a word but we only
856 need one word to store an M2-sized quantity in R.
857 (However, if OUT is nonzero, we need to reload the reg *and*
858 the subreg, so do nothing here, and let following statement handle it.)
860 Note that the case of (SUBREG (CONST_INT...)...) is handled elsewhere;
861 we can't handle it here because CONST_INT does not indicate a mode.
863 Similarly, we must reload the inside expression if we have a
864 STRICT_LOW_PART (presumably, in == out in the cas).
866 Also reload the inner expression if it does not require a secondary
867 reload but the SUBREG does.
869 Finally, reload the inner expression if it is a register that is in
870 the class whose registers cannot be referenced in a different size
871 and M1 is not the same size as M2. If SUBREG_WORD is nonzero, we
872 cannot reload just the inside since we might end up with the wrong
875 if (in != 0 && GET_CODE (in) == SUBREG && SUBREG_WORD (in) == 0
876 #ifdef CLASS_CANNOT_CHANGE_SIZE
877 && class != CLASS_CANNOT_CHANGE_SIZE
879 && (CONSTANT_P (SUBREG_REG (in))
880 || GET_CODE (SUBREG_REG (in)) == PLUS
882 || (((GET_CODE (SUBREG_REG (in)) == REG
883 && REGNO (SUBREG_REG (in)) >= FIRST_PSEUDO_REGISTER)
884 || GET_CODE (SUBREG_REG (in)) == MEM)
885 && ((GET_MODE_SIZE (inmode)
886 > GET_MODE_SIZE (GET_MODE (SUBREG_REG (in))))
887 #ifdef LOAD_EXTEND_OP
888 || (GET_MODE_SIZE (inmode) <= UNITS_PER_WORD
889 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
891 && (GET_MODE_SIZE (inmode)
892 > GET_MODE_SIZE (GET_MODE (SUBREG_REG (in))))
893 && INTEGRAL_MODE_P (GET_MODE (SUBREG_REG (in)))
894 && LOAD_EXTEND_OP (GET_MODE (SUBREG_REG (in))) != NIL)
896 #ifdef WORD_REGISTER_OPERATIONS
897 || ((GET_MODE_SIZE (inmode)
898 < GET_MODE_SIZE (GET_MODE (SUBREG_REG (in))))
899 && ((GET_MODE_SIZE (inmode) - 1) / UNITS_PER_WORD ==
900 ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (in))) - 1)
904 || (GET_CODE (SUBREG_REG (in)) == REG
905 && REGNO (SUBREG_REG (in)) < FIRST_PSEUDO_REGISTER
906 /* The case where out is nonzero
907 is handled differently in the following statement. */
908 && (out == 0 || SUBREG_WORD (in) == 0)
909 && ((GET_MODE_SIZE (inmode) <= UNITS_PER_WORD
910 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
912 && ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
914 != HARD_REGNO_NREGS (REGNO (SUBREG_REG (in)),
915 GET_MODE (SUBREG_REG (in)))))
916 || ! HARD_REGNO_MODE_OK ((REGNO (SUBREG_REG (in))
919 #ifdef SECONDARY_INPUT_RELOAD_CLASS
920 || (SECONDARY_INPUT_RELOAD_CLASS (class, inmode, in) != NO_REGS
921 && (SECONDARY_INPUT_RELOAD_CLASS (class,
922 GET_MODE (SUBREG_REG (in)),
926 #ifdef CLASS_CANNOT_CHANGE_SIZE
927 || (GET_CODE (SUBREG_REG (in)) == REG
928 && REGNO (SUBREG_REG (in)) < FIRST_PSEUDO_REGISTER
929 && (TEST_HARD_REG_BIT
930 (reg_class_contents[(int) CLASS_CANNOT_CHANGE_SIZE],
931 REGNO (SUBREG_REG (in))))
932 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
933 != GET_MODE_SIZE (inmode)))
937 in_subreg_loc = inloc;
938 inloc = &SUBREG_REG (in);
940 #if ! defined (LOAD_EXTEND_OP) && ! defined (WORD_REGISTER_OPERATIONS)
941 if (GET_CODE (in) == MEM)
942 /* This is supposed to happen only for paradoxical subregs made by
943 combine.c. (SUBREG (MEM)) isn't supposed to occur other ways. */
944 if (GET_MODE_SIZE (GET_MODE (in)) > GET_MODE_SIZE (inmode))
947 inmode = GET_MODE (in);
950 /* Similar issue for (SUBREG:M1 (REG:M2 ...) ...) for a hard register R where
951 either M1 is not valid for R or M2 is wider than a word but we only
952 need one word to store an M2-sized quantity in R.
954 However, we must reload the inner reg *as well as* the subreg in
957 /* Similar issue for (SUBREG constant ...) if it was not handled by the
958 code above. This can happen if SUBREG_WORD != 0. */
960 if (in != 0 && GET_CODE (in) == SUBREG
961 && (CONSTANT_P (SUBREG_REG (in))
962 || (GET_CODE (SUBREG_REG (in)) == REG
963 && REGNO (SUBREG_REG (in)) < FIRST_PSEUDO_REGISTER
964 && (! HARD_REGNO_MODE_OK (REGNO (SUBREG_REG (in))
967 || (GET_MODE_SIZE (inmode) <= UNITS_PER_WORD
968 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
970 && ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
972 != HARD_REGNO_NREGS (REGNO (SUBREG_REG (in)),
973 GET_MODE (SUBREG_REG (in)))))))))
975 /* This relies on the fact that emit_reload_insns outputs the
976 instructions for input reloads of type RELOAD_OTHER in the same
977 order as the reloads. Thus if the outer reload is also of type
978 RELOAD_OTHER, we are guaranteed that this inner reload will be
979 output before the outer reload. */
980 push_reload (SUBREG_REG (in), NULL_RTX, &SUBREG_REG (in), NULL_PTR,
981 find_valid_class (inmode, SUBREG_WORD (in)),
982 VOIDmode, VOIDmode, 0, 0, opnum, type);
983 dont_remove_subreg = 1;
986 /* Similarly for paradoxical and problematical SUBREGs on the output.
987 Note that there is no reason we need worry about the previous value
988 of SUBREG_REG (out); even if wider than out,
989 storing in a subreg is entitled to clobber it all
990 (except in the case of STRICT_LOW_PART,
991 and in that case the constraint should label it input-output.) */
992 if (out != 0 && GET_CODE (out) == SUBREG && SUBREG_WORD (out) == 0
993 #ifdef CLASS_CANNOT_CHANGE_SIZE
994 && class != CLASS_CANNOT_CHANGE_SIZE
996 && (CONSTANT_P (SUBREG_REG (out))
998 || (((GET_CODE (SUBREG_REG (out)) == REG
999 && REGNO (SUBREG_REG (out)) >= FIRST_PSEUDO_REGISTER)
1000 || GET_CODE (SUBREG_REG (out)) == MEM)
1001 && ((GET_MODE_SIZE (outmode)
1002 > GET_MODE_SIZE (GET_MODE (SUBREG_REG (out))))
1003 #ifdef WORD_REGISTER_OPERATIONS
1004 || ((GET_MODE_SIZE (outmode)
1005 < GET_MODE_SIZE (GET_MODE (SUBREG_REG (out))))
1006 && ((GET_MODE_SIZE (outmode) - 1) / UNITS_PER_WORD ==
1007 ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (out))) - 1)
1011 || (GET_CODE (SUBREG_REG (out)) == REG
1012 && REGNO (SUBREG_REG (out)) < FIRST_PSEUDO_REGISTER
1013 && ((GET_MODE_SIZE (outmode) <= UNITS_PER_WORD
1014 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (out)))
1016 && ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (out)))
1018 != HARD_REGNO_NREGS (REGNO (SUBREG_REG (out)),
1019 GET_MODE (SUBREG_REG (out)))))
1020 || ! HARD_REGNO_MODE_OK ((REGNO (SUBREG_REG (out))
1021 + SUBREG_WORD (out)),
1023 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1024 || (SECONDARY_OUTPUT_RELOAD_CLASS (class, outmode, out) != NO_REGS
1025 && (SECONDARY_OUTPUT_RELOAD_CLASS (class,
1026 GET_MODE (SUBREG_REG (out)),
1030 #ifdef CLASS_CANNOT_CHANGE_SIZE
1031 || (GET_CODE (SUBREG_REG (out)) == REG
1032 && REGNO (SUBREG_REG (out)) < FIRST_PSEUDO_REGISTER
1033 && (TEST_HARD_REG_BIT
1034 (reg_class_contents[(int) CLASS_CANNOT_CHANGE_SIZE],
1035 REGNO (SUBREG_REG (out))))
1036 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (out)))
1037 != GET_MODE_SIZE (outmode)))
1041 out_subreg_loc = outloc;
1042 outloc = &SUBREG_REG (out);
1044 #if ! defined (LOAD_EXTEND_OP) && ! defined (WORD_REGISTER_OPERATIONS)
1045 if (GET_CODE (out) == MEM
1046 && GET_MODE_SIZE (GET_MODE (out)) > GET_MODE_SIZE (outmode))
1049 outmode = GET_MODE (out);
1052 /* Similar issue for (SUBREG:M1 (REG:M2 ...) ...) for a hard register R where
1053 either M1 is not valid for R or M2 is wider than a word but we only
1054 need one word to store an M2-sized quantity in R.
1056 However, we must reload the inner reg *as well as* the subreg in
1057 that case. In this case, the inner reg is an in-out reload. */
1059 if (out != 0 && GET_CODE (out) == SUBREG
1060 && GET_CODE (SUBREG_REG (out)) == REG
1061 && REGNO (SUBREG_REG (out)) < FIRST_PSEUDO_REGISTER
1062 && (! HARD_REGNO_MODE_OK (REGNO (SUBREG_REG (out)) + SUBREG_WORD (out),
1064 || (GET_MODE_SIZE (outmode) <= UNITS_PER_WORD
1065 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (out)))
1067 && ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (out)))
1069 != HARD_REGNO_NREGS (REGNO (SUBREG_REG (out)),
1070 GET_MODE (SUBREG_REG (out)))))))
1072 /* This relies on the fact that emit_reload_insns outputs the
1073 instructions for output reloads of type RELOAD_OTHER in reverse
1074 order of the reloads. Thus if the outer reload is also of type
1075 RELOAD_OTHER, we are guaranteed that this inner reload will be
1076 output after the outer reload. */
1077 dont_remove_subreg = 1;
1078 push_reload (SUBREG_REG (out), SUBREG_REG (out), &SUBREG_REG (out),
1080 find_valid_class (outmode, SUBREG_WORD (out)),
1081 VOIDmode, VOIDmode, 0, 0,
1082 opnum, RELOAD_OTHER);
1085 /* If IN appears in OUT, we can't share any input-only reload for IN. */
1086 if (in != 0 && out != 0 && GET_CODE (out) == MEM
1087 && (GET_CODE (in) == REG || GET_CODE (in) == MEM)
1088 && reg_overlap_mentioned_for_reload_p (in, XEXP (out, 0)))
1091 /* If IN is a SUBREG of a hard register, make a new REG. This
1092 simplifies some of the cases below. */
1094 if (in != 0 && GET_CODE (in) == SUBREG && GET_CODE (SUBREG_REG (in)) == REG
1095 && REGNO (SUBREG_REG (in)) < FIRST_PSEUDO_REGISTER
1096 && ! dont_remove_subreg)
1097 in = gen_rtx_REG (GET_MODE (in),
1098 REGNO (SUBREG_REG (in)) + SUBREG_WORD (in));
1100 /* Similarly for OUT. */
1101 if (out != 0 && GET_CODE (out) == SUBREG
1102 && GET_CODE (SUBREG_REG (out)) == REG
1103 && REGNO (SUBREG_REG (out)) < FIRST_PSEUDO_REGISTER
1104 && ! dont_remove_subreg)
1105 out = gen_rtx_REG (GET_MODE (out),
1106 REGNO (SUBREG_REG (out)) + SUBREG_WORD (out));
1108 /* Narrow down the class of register wanted if that is
1109 desirable on this machine for efficiency. */
1111 class = PREFERRED_RELOAD_CLASS (in, class);
1113 /* Output reloads may need analogous treatment, different in detail. */
1114 #ifdef PREFERRED_OUTPUT_RELOAD_CLASS
1116 class = PREFERRED_OUTPUT_RELOAD_CLASS (out, class);
1119 /* Make sure we use a class that can handle the actual pseudo
1120 inside any subreg. For example, on the 386, QImode regs
1121 can appear within SImode subregs. Although GENERAL_REGS
1122 can handle SImode, QImode needs a smaller class. */
1123 #ifdef LIMIT_RELOAD_CLASS
1125 class = LIMIT_RELOAD_CLASS (inmode, class);
1126 else if (in != 0 && GET_CODE (in) == SUBREG)
1127 class = LIMIT_RELOAD_CLASS (GET_MODE (SUBREG_REG (in)), class);
1130 class = LIMIT_RELOAD_CLASS (outmode, class);
1131 if (out != 0 && GET_CODE (out) == SUBREG)
1132 class = LIMIT_RELOAD_CLASS (GET_MODE (SUBREG_REG (out)), class);
1135 /* Verify that this class is at least possible for the mode that
1137 if (this_insn_is_asm)
1139 enum machine_mode mode;
1140 if (GET_MODE_SIZE (inmode) > GET_MODE_SIZE (outmode))
1144 if (mode == VOIDmode)
1146 error_for_asm (this_insn, "cannot reload integer constant operand in `asm'");
1151 outmode = word_mode;
1153 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
1154 if (HARD_REGNO_MODE_OK (i, mode)
1155 && TEST_HARD_REG_BIT (reg_class_contents[(int) class], i))
1157 int nregs = HARD_REGNO_NREGS (i, mode);
1160 for (j = 1; j < nregs; j++)
1161 if (! TEST_HARD_REG_BIT (reg_class_contents[(int) class], i + j))
1166 if (i == FIRST_PSEUDO_REGISTER)
1168 error_for_asm (this_insn, "impossible register constraint in `asm'");
1173 if (class == NO_REGS)
1176 /* We can use an existing reload if the class is right
1177 and at least one of IN and OUT is a match
1178 and the other is at worst neutral.
1179 (A zero compared against anything is neutral.)
1181 If SMALL_REGISTER_CLASSES, don't use existing reloads unless they are
1182 for the same thing since that can cause us to need more reload registers
1183 than we otherwise would. */
1185 for (i = 0; i < n_reloads; i++)
1186 if ((reg_class_subset_p (class, reload_reg_class[i])
1187 || reg_class_subset_p (reload_reg_class[i], class))
1188 /* If the existing reload has a register, it must fit our class. */
1189 && (reload_reg_rtx[i] == 0
1190 || TEST_HARD_REG_BIT (reg_class_contents[(int) class],
1191 true_regnum (reload_reg_rtx[i])))
1192 && ((in != 0 && MATCHES (reload_in[i], in) && ! dont_share
1193 && (out == 0 || reload_out[i] == 0 || MATCHES (reload_out[i], out)))
1195 (out != 0 && MATCHES (reload_out[i], out)
1196 && (in == 0 || reload_in[i] == 0 || MATCHES (reload_in[i], in))))
1197 && (reg_class_size[(int) class] == 1 || SMALL_REGISTER_CLASSES)
1198 && MERGABLE_RELOADS (type, reload_when_needed[i],
1199 opnum, reload_opnum[i]))
1202 /* Reloading a plain reg for input can match a reload to postincrement
1203 that reg, since the postincrement's value is the right value.
1204 Likewise, it can match a preincrement reload, since we regard
1205 the preincrementation as happening before any ref in this insn
1206 to that register. */
1208 for (i = 0; i < n_reloads; i++)
1209 if ((reg_class_subset_p (class, reload_reg_class[i])
1210 || reg_class_subset_p (reload_reg_class[i], class))
1211 /* If the existing reload has a register, it must fit our class. */
1212 && (reload_reg_rtx[i] == 0
1213 || TEST_HARD_REG_BIT (reg_class_contents[(int) class],
1214 true_regnum (reload_reg_rtx[i])))
1215 && out == 0 && reload_out[i] == 0 && reload_in[i] != 0
1216 && ((GET_CODE (in) == REG
1217 && (GET_CODE (reload_in[i]) == POST_INC
1218 || GET_CODE (reload_in[i]) == POST_DEC
1219 || GET_CODE (reload_in[i]) == PRE_INC
1220 || GET_CODE (reload_in[i]) == PRE_DEC)
1221 && MATCHES (XEXP (reload_in[i], 0), in))
1223 (GET_CODE (reload_in[i]) == REG
1224 && (GET_CODE (in) == POST_INC
1225 || GET_CODE (in) == POST_DEC
1226 || GET_CODE (in) == PRE_INC
1227 || GET_CODE (in) == PRE_DEC)
1228 && MATCHES (XEXP (in, 0), reload_in[i])))
1229 && (reg_class_size[(int) class] == 1 || SMALL_REGISTER_CLASSES)
1230 && MERGABLE_RELOADS (type, reload_when_needed[i],
1231 opnum, reload_opnum[i]))
1233 /* Make sure reload_in ultimately has the increment,
1234 not the plain register. */
1235 if (GET_CODE (in) == REG)
1242 /* See if we need a secondary reload register to move between CLASS
1243 and IN or CLASS and OUT. Get the icode and push any required reloads
1244 needed for each of them if so. */
1246 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1249 = push_secondary_reload (1, in, opnum, optional, class, inmode, type,
1250 &secondary_in_icode);
1253 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1254 if (out != 0 && GET_CODE (out) != SCRATCH)
1255 secondary_out_reload
1256 = push_secondary_reload (0, out, opnum, optional, class, outmode,
1257 type, &secondary_out_icode);
1260 /* We found no existing reload suitable for re-use.
1261 So add an additional reload. */
1263 #ifdef SECONDARY_MEMORY_NEEDED
1264 /* If a memory location is needed for the copy, make one. */
1265 if (in != 0 && GET_CODE (in) == REG
1266 && REGNO (in) < FIRST_PSEUDO_REGISTER
1267 && SECONDARY_MEMORY_NEEDED (REGNO_REG_CLASS (REGNO (in)),
1269 get_secondary_mem (in, inmode, opnum, type);
1274 reload_out[i] = out;
1275 reload_reg_class[i] = class;
1276 reload_inmode[i] = inmode;
1277 reload_outmode[i] = outmode;
1278 reload_reg_rtx[i] = 0;
1279 reload_optional[i] = optional;
1280 reload_nongroup[i] = 0;
1282 reload_nocombine[i] = 0;
1283 reload_in_reg[i] = inloc ? *inloc : 0;
1284 reload_opnum[i] = opnum;
1285 reload_when_needed[i] = type;
1286 reload_secondary_in_reload[i] = secondary_in_reload;
1287 reload_secondary_out_reload[i] = secondary_out_reload;
1288 reload_secondary_in_icode[i] = secondary_in_icode;
1289 reload_secondary_out_icode[i] = secondary_out_icode;
1290 reload_secondary_p[i] = 0;
1294 #ifdef SECONDARY_MEMORY_NEEDED
1295 if (out != 0 && GET_CODE (out) == REG
1296 && REGNO (out) < FIRST_PSEUDO_REGISTER
1297 && SECONDARY_MEMORY_NEEDED (class, REGNO_REG_CLASS (REGNO (out)),
1299 get_secondary_mem (out, outmode, opnum, type);
1304 /* We are reusing an existing reload,
1305 but we may have additional information for it.
1306 For example, we may now have both IN and OUT
1307 while the old one may have just one of them. */
1309 /* The modes can be different. If they are, we want to reload in
1310 the larger mode, so that the value is valid for both modes. */
1311 if (inmode != VOIDmode
1312 && GET_MODE_SIZE (inmode) > GET_MODE_SIZE (reload_inmode[i]))
1313 reload_inmode[i] = inmode;
1314 if (outmode != VOIDmode
1315 && GET_MODE_SIZE (outmode) > GET_MODE_SIZE (reload_outmode[i]))
1316 reload_outmode[i] = outmode;
1320 reload_out[i] = out;
1321 if (reg_class_subset_p (class, reload_reg_class[i]))
1322 reload_reg_class[i] = class;
1323 reload_optional[i] &= optional;
1324 if (MERGE_TO_OTHER (type, reload_when_needed[i],
1325 opnum, reload_opnum[i]))
1326 reload_when_needed[i] = RELOAD_OTHER;
1327 reload_opnum[i] = MIN (reload_opnum[i], opnum);
1330 /* If the ostensible rtx being reload differs from the rtx found
1331 in the location to substitute, this reload is not safe to combine
1332 because we cannot reliably tell whether it appears in the insn. */
1334 if (in != 0 && in != *inloc)
1335 reload_nocombine[i] = 1;
1338 /* This was replaced by changes in find_reloads_address_1 and the new
1339 function inc_for_reload, which go with a new meaning of reload_inc. */
1341 /* If this is an IN/OUT reload in an insn that sets the CC,
1342 it must be for an autoincrement. It doesn't work to store
1343 the incremented value after the insn because that would clobber the CC.
1344 So we must do the increment of the value reloaded from,
1345 increment it, store it back, then decrement again. */
1346 if (out != 0 && sets_cc0_p (PATTERN (this_insn)))
1350 reload_inc[i] = find_inc_amount (PATTERN (this_insn), in);
1351 /* If we did not find a nonzero amount-to-increment-by,
1352 that contradicts the belief that IN is being incremented
1353 in an address in this insn. */
1354 if (reload_inc[i] == 0)
1359 /* If we will replace IN and OUT with the reload-reg,
1360 record where they are located so that substitution need
1361 not do a tree walk. */
1363 if (replace_reloads)
1367 register struct replacement *r = &replacements[n_replacements++];
1369 r->subreg_loc = in_subreg_loc;
1373 if (outloc != 0 && outloc != inloc)
1375 register struct replacement *r = &replacements[n_replacements++];
1378 r->subreg_loc = out_subreg_loc;
1383 /* If this reload is just being introduced and it has both
1384 an incoming quantity and an outgoing quantity that are
1385 supposed to be made to match, see if either one of the two
1386 can serve as the place to reload into.
1388 If one of them is acceptable, set reload_reg_rtx[i]
1391 if (in != 0 && out != 0 && in != out && reload_reg_rtx[i] == 0)
1393 reload_reg_rtx[i] = find_dummy_reload (in, out, inloc, outloc,
1395 reload_reg_class[i], i,
1396 earlyclobber_operand_p (out));
1398 /* If the outgoing register already contains the same value
1399 as the incoming one, we can dispense with loading it.
1400 The easiest way to tell the caller that is to give a phony
1401 value for the incoming operand (same as outgoing one). */
1402 if (reload_reg_rtx[i] == out
1403 && (GET_CODE (in) == REG || CONSTANT_P (in))
1404 && 0 != find_equiv_reg (in, this_insn, 0, REGNO (out),
1405 static_reload_reg_p, i, inmode))
1409 /* If this is an input reload and the operand contains a register that
1410 dies in this insn and is used nowhere else, see if it is the right class
1411 to be used for this reload. Use it if so. (This occurs most commonly
1412 in the case of paradoxical SUBREGs and in-out reloads). We cannot do
1413 this if it is also an output reload that mentions the register unless
1414 the output is a SUBREG that clobbers an entire register.
1416 Note that the operand might be one of the spill regs, if it is a
1417 pseudo reg and we are in a block where spilling has not taken place.
1418 But if there is no spilling in this block, that is OK.
1419 An explicitly used hard reg cannot be a spill reg. */
1421 if (reload_reg_rtx[i] == 0 && in != 0)
1426 for (note = REG_NOTES (this_insn); note; note = XEXP (note, 1))
1427 if (REG_NOTE_KIND (note) == REG_DEAD
1428 && GET_CODE (XEXP (note, 0)) == REG
1429 && (regno = REGNO (XEXP (note, 0))) < FIRST_PSEUDO_REGISTER
1430 && reg_mentioned_p (XEXP (note, 0), in)
1431 && ! refers_to_regno_for_reload_p (regno,
1433 + HARD_REGNO_NREGS (regno,
1435 PATTERN (this_insn), inloc)
1436 /* If this is also an output reload, IN cannot be used as
1437 the reload register if it is set in this insn unless IN
1439 && (out == 0 || in == out
1440 || ! hard_reg_set_here_p (regno,
1442 + HARD_REGNO_NREGS (regno,
1444 PATTERN (this_insn)))
1445 /* ??? Why is this code so different from the previous?
1446 Is there any simple coherent way to describe the two together?
1447 What's going on here. */
1449 || (GET_CODE (in) == SUBREG
1450 && (((GET_MODE_SIZE (GET_MODE (in)) + (UNITS_PER_WORD - 1))
1452 == ((GET_MODE_SIZE (GET_MODE (SUBREG_REG (in)))
1453 + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD))))
1454 /* Make sure the operand fits in the reg that dies. */
1455 && GET_MODE_SIZE (inmode) <= GET_MODE_SIZE (GET_MODE (XEXP (note, 0)))
1456 && HARD_REGNO_MODE_OK (regno, inmode)
1457 && GET_MODE_SIZE (outmode) <= GET_MODE_SIZE (GET_MODE (XEXP (note, 0)))
1458 && HARD_REGNO_MODE_OK (regno, outmode)
1459 && TEST_HARD_REG_BIT (reg_class_contents[(int) class], regno)
1460 && !fixed_regs[regno])
1462 reload_reg_rtx[i] = gen_rtx_REG (inmode, regno);
1468 output_reloadnum = i;
1473 /* Record an additional place we must replace a value
1474 for which we have already recorded a reload.
1475 RELOADNUM is the value returned by push_reload
1476 when the reload was recorded.
1477 This is used in insn patterns that use match_dup. */
1480 push_replacement (loc, reloadnum, mode)
1483 enum machine_mode mode;
1485 if (replace_reloads)
1487 register struct replacement *r = &replacements[n_replacements++];
1488 r->what = reloadnum;
1495 /* Transfer all replacements that used to be in reload FROM to be in
1499 transfer_replacements (to, from)
1504 for (i = 0; i < n_replacements; i++)
1505 if (replacements[i].what == from)
1506 replacements[i].what = to;
1509 /* Remove all replacements in reload FROM. */
1511 remove_replacements (from)
1516 for (i = 0, j = 0; i < n_replacements; i++)
1518 if (replacements[i].what == from)
1520 replacements[j++] = replacements[i];
1524 /* If there is only one output reload, and it is not for an earlyclobber
1525 operand, try to combine it with a (logically unrelated) input reload
1526 to reduce the number of reload registers needed.
1528 This is safe if the input reload does not appear in
1529 the value being output-reloaded, because this implies
1530 it is not needed any more once the original insn completes.
1532 If that doesn't work, see we can use any of the registers that
1533 die in this insn as a reload register. We can if it is of the right
1534 class and does not appear in the value being output-reloaded. */
1540 int output_reload = -1;
1541 int secondary_out = -1;
1544 /* Find the output reload; return unless there is exactly one
1545 and that one is mandatory. */
1547 for (i = 0; i < n_reloads; i++)
1548 if (reload_out[i] != 0)
1550 if (output_reload >= 0)
1555 if (output_reload < 0 || reload_optional[output_reload])
1558 /* An input-output reload isn't combinable. */
1560 if (reload_in[output_reload] != 0)
1563 /* If this reload is for an earlyclobber operand, we can't do anything. */
1564 if (earlyclobber_operand_p (reload_out[output_reload]))
1567 /* Check each input reload; can we combine it? */
1569 for (i = 0; i < n_reloads; i++)
1570 if (reload_in[i] && ! reload_optional[i] && ! reload_nocombine[i]
1571 /* Life span of this reload must not extend past main insn. */
1572 && reload_when_needed[i] != RELOAD_FOR_OUTPUT_ADDRESS
1573 && reload_when_needed[i] != RELOAD_FOR_OUTADDR_ADDRESS
1574 && reload_when_needed[i] != RELOAD_OTHER
1575 && (CLASS_MAX_NREGS (reload_reg_class[i], reload_inmode[i])
1576 == CLASS_MAX_NREGS (reload_reg_class[output_reload],
1577 reload_outmode[output_reload]))
1578 && reload_inc[i] == 0
1579 && reload_reg_rtx[i] == 0
1580 #ifdef SECONDARY_MEMORY_NEEDED
1581 /* Don't combine two reloads with different secondary
1582 memory locations. */
1583 && (secondary_memlocs_elim[(int) reload_outmode[output_reload]][reload_opnum[i]] == 0
1584 || secondary_memlocs_elim[(int) reload_outmode[output_reload]][reload_opnum[output_reload]] == 0
1585 || rtx_equal_p (secondary_memlocs_elim[(int) reload_outmode[output_reload]][reload_opnum[i]],
1586 secondary_memlocs_elim[(int) reload_outmode[output_reload]][reload_opnum[output_reload]]))
1588 && (SMALL_REGISTER_CLASSES
1589 ? (reload_reg_class[i] == reload_reg_class[output_reload])
1590 : (reg_class_subset_p (reload_reg_class[i],
1591 reload_reg_class[output_reload])
1592 || reg_class_subset_p (reload_reg_class[output_reload],
1593 reload_reg_class[i])))
1594 && (MATCHES (reload_in[i], reload_out[output_reload])
1595 /* Args reversed because the first arg seems to be
1596 the one that we imagine being modified
1597 while the second is the one that might be affected. */
1598 || (! reg_overlap_mentioned_for_reload_p (reload_out[output_reload],
1600 /* However, if the input is a register that appears inside
1601 the output, then we also can't share.
1602 Imagine (set (mem (reg 69)) (plus (reg 69) ...)).
1603 If the same reload reg is used for both reg 69 and the
1604 result to be stored in memory, then that result
1605 will clobber the address of the memory ref. */
1606 && ! (GET_CODE (reload_in[i]) == REG
1607 && reg_overlap_mentioned_for_reload_p (reload_in[i],
1608 reload_out[output_reload]))))
1609 && (reg_class_size[(int) reload_reg_class[i]]
1610 || SMALL_REGISTER_CLASSES)
1611 /* We will allow making things slightly worse by combining an
1612 input and an output, but no worse than that. */
1613 && (reload_when_needed[i] == RELOAD_FOR_INPUT
1614 || reload_when_needed[i] == RELOAD_FOR_OUTPUT))
1618 /* We have found a reload to combine with! */
1619 reload_out[i] = reload_out[output_reload];
1620 reload_outmode[i] = reload_outmode[output_reload];
1621 /* Mark the old output reload as inoperative. */
1622 reload_out[output_reload] = 0;
1623 /* The combined reload is needed for the entire insn. */
1624 reload_when_needed[i] = RELOAD_OTHER;
1625 /* If the output reload had a secondary reload, copy it. */
1626 if (reload_secondary_out_reload[output_reload] != -1)
1628 reload_secondary_out_reload[i]
1629 = reload_secondary_out_reload[output_reload];
1630 reload_secondary_out_icode[i]
1631 = reload_secondary_out_icode[output_reload];
1634 #ifdef SECONDARY_MEMORY_NEEDED
1635 /* Copy any secondary MEM. */
1636 if (secondary_memlocs_elim[(int) reload_outmode[output_reload]][reload_opnum[output_reload]] != 0)
1637 secondary_memlocs_elim[(int) reload_outmode[output_reload]][reload_opnum[i]]
1638 = secondary_memlocs_elim[(int) reload_outmode[output_reload]][reload_opnum[output_reload]];
1640 /* If required, minimize the register class. */
1641 if (reg_class_subset_p (reload_reg_class[output_reload],
1642 reload_reg_class[i]))
1643 reload_reg_class[i] = reload_reg_class[output_reload];
1645 /* Transfer all replacements from the old reload to the combined. */
1646 for (j = 0; j < n_replacements; j++)
1647 if (replacements[j].what == output_reload)
1648 replacements[j].what = i;
1653 /* If this insn has only one operand that is modified or written (assumed
1654 to be the first), it must be the one corresponding to this reload. It
1655 is safe to use anything that dies in this insn for that output provided
1656 that it does not occur in the output (we already know it isn't an
1657 earlyclobber. If this is an asm insn, give up. */
1659 if (INSN_CODE (this_insn) == -1)
1662 for (i = 1; i < insn_n_operands[INSN_CODE (this_insn)]; i++)
1663 if (insn_operand_constraint[INSN_CODE (this_insn)][i][0] == '='
1664 || insn_operand_constraint[INSN_CODE (this_insn)][i][0] == '+')
1667 /* See if some hard register that dies in this insn and is not used in
1668 the output is the right class. Only works if the register we pick
1669 up can fully hold our output reload. */
1670 for (note = REG_NOTES (this_insn); note; note = XEXP (note, 1))
1671 if (REG_NOTE_KIND (note) == REG_DEAD
1672 && GET_CODE (XEXP (note, 0)) == REG
1673 && ! reg_overlap_mentioned_for_reload_p (XEXP (note, 0),
1674 reload_out[output_reload])
1675 && REGNO (XEXP (note, 0)) < FIRST_PSEUDO_REGISTER
1676 && HARD_REGNO_MODE_OK (REGNO (XEXP (note, 0)), reload_outmode[output_reload])
1677 && TEST_HARD_REG_BIT (reg_class_contents[(int) reload_reg_class[output_reload]],
1678 REGNO (XEXP (note, 0)))
1679 && (HARD_REGNO_NREGS (REGNO (XEXP (note, 0)), reload_outmode[output_reload])
1680 <= HARD_REGNO_NREGS (REGNO (XEXP (note, 0)), GET_MODE (XEXP (note, 0))))
1681 /* Ensure that a secondary or tertiary reload for this output
1682 won't want this register. */
1683 && ((secondary_out = reload_secondary_out_reload[output_reload]) == -1
1684 || (! (TEST_HARD_REG_BIT
1685 (reg_class_contents[(int) reload_reg_class[secondary_out]],
1686 REGNO (XEXP (note, 0))))
1687 && ((secondary_out = reload_secondary_out_reload[secondary_out]) == -1
1688 || ! (TEST_HARD_REG_BIT
1689 (reg_class_contents[(int) reload_reg_class[secondary_out]],
1690 REGNO (XEXP (note, 0)))))))
1691 && ! fixed_regs[REGNO (XEXP (note, 0))])
1693 reload_reg_rtx[output_reload]
1694 = gen_rtx_REG (reload_outmode[output_reload],
1695 REGNO (XEXP (note, 0)));
1700 /* Try to find a reload register for an in-out reload (expressions IN and OUT).
1701 See if one of IN and OUT is a register that may be used;
1702 this is desirable since a spill-register won't be needed.
1703 If so, return the register rtx that proves acceptable.
1705 INLOC and OUTLOC are locations where IN and OUT appear in the insn.
1706 CLASS is the register class required for the reload.
1708 If FOR_REAL is >= 0, it is the number of the reload,
1709 and in some cases when it can be discovered that OUT doesn't need
1710 to be computed, clear out reload_out[FOR_REAL].
1712 If FOR_REAL is -1, this should not be done, because this call
1713 is just to see if a register can be found, not to find and install it.
1715 EARLYCLOBBER is non-zero if OUT is an earlyclobber operand. This
1716 puts an additional constraint on being able to use IN for OUT since
1717 IN must not appear elsewhere in the insn (it is assumed that IN itself
1718 is safe from the earlyclobber). */
1721 find_dummy_reload (real_in, real_out, inloc, outloc,
1722 inmode, outmode, class, for_real, earlyclobber)
1723 rtx real_in, real_out;
1724 rtx *inloc, *outloc;
1725 enum machine_mode inmode, outmode;
1726 enum reg_class class;
1736 /* If operands exceed a word, we can't use either of them
1737 unless they have the same size. */
1738 if (GET_MODE_SIZE (outmode) != GET_MODE_SIZE (inmode)
1739 && (GET_MODE_SIZE (outmode) > UNITS_PER_WORD
1740 || GET_MODE_SIZE (inmode) > UNITS_PER_WORD))
1743 /* Find the inside of any subregs. */
1744 while (GET_CODE (out) == SUBREG)
1746 out_offset = SUBREG_WORD (out);
1747 out = SUBREG_REG (out);
1749 while (GET_CODE (in) == SUBREG)
1751 in_offset = SUBREG_WORD (in);
1752 in = SUBREG_REG (in);
1755 /* Narrow down the reg class, the same way push_reload will;
1756 otherwise we might find a dummy now, but push_reload won't. */
1757 class = PREFERRED_RELOAD_CLASS (in, class);
1759 /* See if OUT will do. */
1760 if (GET_CODE (out) == REG
1761 && REGNO (out) < FIRST_PSEUDO_REGISTER)
1763 register int regno = REGNO (out) + out_offset;
1764 int nwords = HARD_REGNO_NREGS (regno, outmode);
1767 /* When we consider whether the insn uses OUT,
1768 ignore references within IN. They don't prevent us
1769 from copying IN into OUT, because those refs would
1770 move into the insn that reloads IN.
1772 However, we only ignore IN in its role as this reload.
1773 If the insn uses IN elsewhere and it contains OUT,
1774 that counts. We can't be sure it's the "same" operand
1775 so it might not go through this reload. */
1777 *inloc = const0_rtx;
1779 if (regno < FIRST_PSEUDO_REGISTER
1780 /* A fixed reg that can overlap other regs better not be used
1781 for reloading in any way. */
1782 #ifdef OVERLAPPING_REGNO_P
1783 && ! (fixed_regs[regno] && OVERLAPPING_REGNO_P (regno))
1785 && ! refers_to_regno_for_reload_p (regno, regno + nwords,
1786 PATTERN (this_insn), outloc))
1789 for (i = 0; i < nwords; i++)
1790 if (! TEST_HARD_REG_BIT (reg_class_contents[(int) class],
1796 if (GET_CODE (real_out) == REG)
1799 value = gen_rtx_REG (outmode, regno);
1806 /* Consider using IN if OUT was not acceptable
1807 or if OUT dies in this insn (like the quotient in a divmod insn).
1808 We can't use IN unless it is dies in this insn,
1809 which means we must know accurately which hard regs are live.
1810 Also, the result can't go in IN if IN is used within OUT,
1811 or if OUT is an earlyclobber and IN appears elsewhere in the insn. */
1812 if (hard_regs_live_known
1813 && GET_CODE (in) == REG
1814 && REGNO (in) < FIRST_PSEUDO_REGISTER
1816 || find_reg_note (this_insn, REG_UNUSED, real_out))
1817 && find_reg_note (this_insn, REG_DEAD, real_in)
1818 && !fixed_regs[REGNO (in)]
1819 && HARD_REGNO_MODE_OK (REGNO (in),
1820 /* The only case where out and real_out might
1821 have different modes is where real_out
1822 is a subreg, and in that case, out
1824 (GET_MODE (out) != VOIDmode
1825 ? GET_MODE (out) : outmode)))
1827 register int regno = REGNO (in) + in_offset;
1828 int nwords = HARD_REGNO_NREGS (regno, inmode);
1830 if (! refers_to_regno_for_reload_p (regno, regno + nwords, out, NULL_PTR)
1831 && ! hard_reg_set_here_p (regno, regno + nwords,
1832 PATTERN (this_insn))
1834 || ! refers_to_regno_for_reload_p (regno, regno + nwords,
1835 PATTERN (this_insn), inloc)))
1838 for (i = 0; i < nwords; i++)
1839 if (! TEST_HARD_REG_BIT (reg_class_contents[(int) class],
1845 /* If we were going to use OUT as the reload reg
1846 and changed our mind, it means OUT is a dummy that
1847 dies here. So don't bother copying value to it. */
1848 if (for_real >= 0 && value == real_out)
1849 reload_out[for_real] = 0;
1850 if (GET_CODE (real_in) == REG)
1853 value = gen_rtx_REG (inmode, regno);
1861 /* This page contains subroutines used mainly for determining
1862 whether the IN or an OUT of a reload can serve as the
1865 /* Return 1 if X is an operand of an insn that is being earlyclobbered. */
1868 earlyclobber_operand_p (x)
1873 for (i = 0; i < n_earlyclobbers; i++)
1874 if (reload_earlyclobbers[i] == x)
1880 /* Return 1 if expression X alters a hard reg in the range
1881 from BEG_REGNO (inclusive) to END_REGNO (exclusive),
1882 either explicitly or in the guise of a pseudo-reg allocated to REGNO.
1883 X should be the body of an instruction. */
1886 hard_reg_set_here_p (beg_regno, end_regno, x)
1887 register int beg_regno, end_regno;
1890 if (GET_CODE (x) == SET || GET_CODE (x) == CLOBBER)
1892 register rtx op0 = SET_DEST (x);
1893 while (GET_CODE (op0) == SUBREG)
1894 op0 = SUBREG_REG (op0);
1895 if (GET_CODE (op0) == REG)
1897 register int r = REGNO (op0);
1898 /* See if this reg overlaps range under consideration. */
1900 && r + HARD_REGNO_NREGS (r, GET_MODE (op0)) > beg_regno)
1904 else if (GET_CODE (x) == PARALLEL)
1906 register int i = XVECLEN (x, 0) - 1;
1908 if (hard_reg_set_here_p (beg_regno, end_regno, XVECEXP (x, 0, i)))
1915 /* Return 1 if ADDR is a valid memory address for mode MODE,
1916 and check that each pseudo reg has the proper kind of
1920 strict_memory_address_p (mode, addr)
1921 enum machine_mode mode;
1924 GO_IF_LEGITIMATE_ADDRESS (mode, addr, win);
1931 /* Like rtx_equal_p except that it allows a REG and a SUBREG to match
1932 if they are the same hard reg, and has special hacks for
1933 autoincrement and autodecrement.
1934 This is specifically intended for find_reloads to use
1935 in determining whether two operands match.
1936 X is the operand whose number is the lower of the two.
1938 The value is 2 if Y contains a pre-increment that matches
1939 a non-incrementing address in X. */
1941 /* ??? To be completely correct, we should arrange to pass
1942 for X the output operand and for Y the input operand.
1943 For now, we assume that the output operand has the lower number
1944 because that is natural in (SET output (... input ...)). */
1947 operands_match_p (x, y)
1951 register RTX_CODE code = GET_CODE (x);
1957 if ((code == REG || (code == SUBREG && GET_CODE (SUBREG_REG (x)) == REG))
1958 && (GET_CODE (y) == REG || (GET_CODE (y) == SUBREG
1959 && GET_CODE (SUBREG_REG (y)) == REG)))
1965 i = REGNO (SUBREG_REG (x));
1966 if (i >= FIRST_PSEUDO_REGISTER)
1968 i += SUBREG_WORD (x);
1973 if (GET_CODE (y) == SUBREG)
1975 j = REGNO (SUBREG_REG (y));
1976 if (j >= FIRST_PSEUDO_REGISTER)
1978 j += SUBREG_WORD (y);
1983 /* On a WORDS_BIG_ENDIAN machine, point to the last register of a
1984 multiple hard register group, so that for example (reg:DI 0) and
1985 (reg:SI 1) will be considered the same register. */
1986 if (WORDS_BIG_ENDIAN && GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD
1987 && i < FIRST_PSEUDO_REGISTER)
1988 i += (GET_MODE_SIZE (GET_MODE (x)) / UNITS_PER_WORD) - 1;
1989 if (WORDS_BIG_ENDIAN && GET_MODE_SIZE (GET_MODE (y)) > UNITS_PER_WORD
1990 && j < FIRST_PSEUDO_REGISTER)
1991 j += (GET_MODE_SIZE (GET_MODE (y)) / UNITS_PER_WORD) - 1;
1995 /* If two operands must match, because they are really a single
1996 operand of an assembler insn, then two postincrements are invalid
1997 because the assembler insn would increment only once.
1998 On the other hand, an postincrement matches ordinary indexing
1999 if the postincrement is the output operand. */
2000 if (code == POST_DEC || code == POST_INC)
2001 return operands_match_p (XEXP (x, 0), y);
2002 /* Two preincrements are invalid
2003 because the assembler insn would increment only once.
2004 On the other hand, an preincrement matches ordinary indexing
2005 if the preincrement is the input operand.
2006 In this case, return 2, since some callers need to do special
2007 things when this happens. */
2008 if (GET_CODE (y) == PRE_DEC || GET_CODE (y) == PRE_INC)
2009 return operands_match_p (x, XEXP (y, 0)) ? 2 : 0;
2013 /* Now we have disposed of all the cases
2014 in which different rtx codes can match. */
2015 if (code != GET_CODE (y))
2017 if (code == LABEL_REF)
2018 return XEXP (x, 0) == XEXP (y, 0);
2019 if (code == SYMBOL_REF)
2020 return XSTR (x, 0) == XSTR (y, 0);
2022 /* (MULT:SI x y) and (MULT:HI x y) are NOT equivalent. */
2024 if (GET_MODE (x) != GET_MODE (y))
2027 /* Compare the elements. If any pair of corresponding elements
2028 fail to match, return 0 for the whole things. */
2031 fmt = GET_RTX_FORMAT (code);
2032 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
2038 if (XWINT (x, i) != XWINT (y, i))
2043 if (XINT (x, i) != XINT (y, i))
2048 val = operands_match_p (XEXP (x, i), XEXP (y, i));
2051 /* If any subexpression returns 2,
2052 we should return 2 if we are successful. */
2061 if (XVECLEN (x, i) != XVECLEN (y, i))
2063 for (j = XVECLEN (x, i) - 1; j >= 0; --j)
2065 val = operands_match_p (XVECEXP (x, i, j), XVECEXP (y, i, j));
2073 /* It is believed that rtx's at this level will never
2074 contain anything but integers and other rtx's,
2075 except for within LABEL_REFs and SYMBOL_REFs. */
2080 return 1 + success_2;
2083 /* Return the number of times character C occurs in string S. */
2086 n_occurrences (c, s)
2096 /* Describe the range of registers or memory referenced by X.
2097 If X is a register, set REG_FLAG and put the first register
2098 number into START and the last plus one into END.
2099 If X is a memory reference, put a base address into BASE
2100 and a range of integer offsets into START and END.
2101 If X is pushing on the stack, we can assume it causes no trouble,
2102 so we set the SAFE field. */
2104 static struct decomposition
2108 struct decomposition val;
2114 if (GET_CODE (x) == MEM)
2116 rtx base, offset = 0;
2117 rtx addr = XEXP (x, 0);
2119 if (GET_CODE (addr) == PRE_DEC || GET_CODE (addr) == PRE_INC
2120 || GET_CODE (addr) == POST_DEC || GET_CODE (addr) == POST_INC)
2122 val.base = XEXP (addr, 0);
2123 val.start = - GET_MODE_SIZE (GET_MODE (x));
2124 val.end = GET_MODE_SIZE (GET_MODE (x));
2125 val.safe = REGNO (val.base) == STACK_POINTER_REGNUM;
2129 if (GET_CODE (addr) == CONST)
2131 addr = XEXP (addr, 0);
2134 if (GET_CODE (addr) == PLUS)
2136 if (CONSTANT_P (XEXP (addr, 0)))
2138 base = XEXP (addr, 1);
2139 offset = XEXP (addr, 0);
2141 else if (CONSTANT_P (XEXP (addr, 1)))
2143 base = XEXP (addr, 0);
2144 offset = XEXP (addr, 1);
2151 offset = const0_rtx;
2153 if (GET_CODE (offset) == CONST)
2154 offset = XEXP (offset, 0);
2155 if (GET_CODE (offset) == PLUS)
2157 if (GET_CODE (XEXP (offset, 0)) == CONST_INT)
2159 base = gen_rtx_PLUS (GET_MODE (base), base, XEXP (offset, 1));
2160 offset = XEXP (offset, 0);
2162 else if (GET_CODE (XEXP (offset, 1)) == CONST_INT)
2164 base = gen_rtx_PLUS (GET_MODE (base), base, XEXP (offset, 0));
2165 offset = XEXP (offset, 1);
2169 base = gen_rtx_PLUS (GET_MODE (base), base, offset);
2170 offset = const0_rtx;
2173 else if (GET_CODE (offset) != CONST_INT)
2175 base = gen_rtx_PLUS (GET_MODE (base), base, offset);
2176 offset = const0_rtx;
2179 if (all_const && GET_CODE (base) == PLUS)
2180 base = gen_rtx_CONST (GET_MODE (base), base);
2182 if (GET_CODE (offset) != CONST_INT)
2185 val.start = INTVAL (offset);
2186 val.end = val.start + GET_MODE_SIZE (GET_MODE (x));
2190 else if (GET_CODE (x) == REG)
2193 val.start = true_regnum (x);
2196 /* A pseudo with no hard reg. */
2197 val.start = REGNO (x);
2198 val.end = val.start + 1;
2202 val.end = val.start + HARD_REGNO_NREGS (val.start, GET_MODE (x));
2204 else if (GET_CODE (x) == SUBREG)
2206 if (GET_CODE (SUBREG_REG (x)) != REG)
2207 /* This could be more precise, but it's good enough. */
2208 return decompose (SUBREG_REG (x));
2210 val.start = true_regnum (x);
2212 return decompose (SUBREG_REG (x));
2215 val.end = val.start + HARD_REGNO_NREGS (val.start, GET_MODE (x));
2217 else if (CONSTANT_P (x)
2218 /* This hasn't been assigned yet, so it can't conflict yet. */
2219 || GET_CODE (x) == SCRATCH)
2226 /* Return 1 if altering Y will not modify the value of X.
2227 Y is also described by YDATA, which should be decompose (Y). */
2230 immune_p (x, y, ydata)
2232 struct decomposition ydata;
2234 struct decomposition xdata;
2237 return !refers_to_regno_for_reload_p (ydata.start, ydata.end, x, NULL_PTR);
2241 if (GET_CODE (y) != MEM)
2243 /* If Y is memory and X is not, Y can't affect X. */
2244 if (GET_CODE (x) != MEM)
2247 xdata = decompose (x);
2249 if (! rtx_equal_p (xdata.base, ydata.base))
2251 /* If bases are distinct symbolic constants, there is no overlap. */
2252 if (CONSTANT_P (xdata.base) && CONSTANT_P (ydata.base))
2254 /* Constants and stack slots never overlap. */
2255 if (CONSTANT_P (xdata.base)
2256 && (ydata.base == frame_pointer_rtx
2257 || ydata.base == hard_frame_pointer_rtx
2258 || ydata.base == stack_pointer_rtx))
2260 if (CONSTANT_P (ydata.base)
2261 && (xdata.base == frame_pointer_rtx
2262 || xdata.base == hard_frame_pointer_rtx
2263 || xdata.base == stack_pointer_rtx))
2265 /* If either base is variable, we don't know anything. */
2270 return (xdata.start >= ydata.end || ydata.start >= xdata.end);
2273 /* Similar, but calls decompose. */
2276 safe_from_earlyclobber (op, clobber)
2279 struct decomposition early_data;
2281 early_data = decompose (clobber);
2282 return immune_p (op, clobber, early_data);
2285 /* Main entry point of this file: search the body of INSN
2286 for values that need reloading and record them with push_reload.
2287 REPLACE nonzero means record also where the values occur
2288 so that subst_reloads can be used.
2290 IND_LEVELS says how many levels of indirection are supported by this
2291 machine; a value of zero means that a memory reference is not a valid
2294 LIVE_KNOWN says we have valid information about which hard
2295 regs are live at each point in the program; this is true when
2296 we are called from global_alloc but false when stupid register
2297 allocation has been done.
2299 RELOAD_REG_P if nonzero is a vector indexed by hard reg number
2300 which is nonnegative if the reg has been commandeered for reloading into.
2301 It is copied into STATIC_RELOAD_REG_P and referenced from there
2302 by various subroutines. */
2305 find_reloads (insn, replace, ind_levels, live_known, reload_reg_p)
2307 int replace, ind_levels;
2309 short *reload_reg_p;
2311 #ifdef REGISTER_CONSTRAINTS
2313 register int insn_code_number;
2316 /* These are the constraints for the insn. We don't change them. */
2317 char *constraints1[MAX_RECOG_OPERANDS];
2318 /* These start out as the constraints for the insn
2319 and they are chewed up as we consider alternatives. */
2320 char *constraints[MAX_RECOG_OPERANDS];
2321 /* These are the preferred classes for an operand, or NO_REGS if it isn't
2323 enum reg_class preferred_class[MAX_RECOG_OPERANDS];
2324 char pref_or_nothing[MAX_RECOG_OPERANDS];
2325 /* Nonzero for a MEM operand whose entire address needs a reload. */
2326 int address_reloaded[MAX_RECOG_OPERANDS];
2327 /* Value of enum reload_type to use for operand. */
2328 enum reload_type operand_type[MAX_RECOG_OPERANDS];
2329 /* Value of enum reload_type to use within address of operand. */
2330 enum reload_type address_type[MAX_RECOG_OPERANDS];
2331 /* Save the usage of each operand. */
2332 enum reload_usage { RELOAD_READ, RELOAD_READ_WRITE, RELOAD_WRITE } modified[MAX_RECOG_OPERANDS];
2333 int no_input_reloads = 0, no_output_reloads = 0;
2335 int this_alternative[MAX_RECOG_OPERANDS];
2336 char this_alternative_win[MAX_RECOG_OPERANDS];
2337 char this_alternative_offmemok[MAX_RECOG_OPERANDS];
2338 char this_alternative_earlyclobber[MAX_RECOG_OPERANDS];
2339 int this_alternative_matches[MAX_RECOG_OPERANDS];
2341 int goal_alternative[MAX_RECOG_OPERANDS];
2342 int this_alternative_number;
2343 int goal_alternative_number;
2344 int operand_reloadnum[MAX_RECOG_OPERANDS];
2345 int goal_alternative_matches[MAX_RECOG_OPERANDS];
2346 int goal_alternative_matched[MAX_RECOG_OPERANDS];
2347 char goal_alternative_win[MAX_RECOG_OPERANDS];
2348 char goal_alternative_offmemok[MAX_RECOG_OPERANDS];
2349 char goal_alternative_earlyclobber[MAX_RECOG_OPERANDS];
2350 int goal_alternative_swapped;
2354 char operands_match[MAX_RECOG_OPERANDS][MAX_RECOG_OPERANDS];
2355 rtx substed_operand[MAX_RECOG_OPERANDS];
2356 rtx body = PATTERN (insn);
2357 rtx set = single_set (insn);
2358 int goal_earlyclobber, this_earlyclobber;
2359 enum machine_mode operand_mode[MAX_RECOG_OPERANDS];
2360 /* Cache the last regno for the last pseudo we did an output reload
2361 for in case the next insn uses it. */
2362 static int last_output_reload_regno = -1;
2365 this_insn_is_asm = 0; /* Tentative. */
2369 n_earlyclobbers = 0;
2370 replace_reloads = replace;
2371 hard_regs_live_known = live_known;
2372 static_reload_reg_p = reload_reg_p;
2374 /* JUMP_INSNs and CALL_INSNs are not allowed to have any output reloads;
2375 neither are insns that SET cc0. Insns that use CC0 are not allowed
2376 to have any input reloads. */
2377 if (GET_CODE (insn) == JUMP_INSN || GET_CODE (insn) == CALL_INSN)
2378 no_output_reloads = 1;
2381 if (reg_referenced_p (cc0_rtx, PATTERN (insn)))
2382 no_input_reloads = 1;
2383 if (reg_set_p (cc0_rtx, PATTERN (insn)))
2384 no_output_reloads = 1;
2387 #ifdef SECONDARY_MEMORY_NEEDED
2388 /* The eliminated forms of any secondary memory locations are per-insn, so
2389 clear them out here. */
2391 bzero ((char *) secondary_memlocs_elim, sizeof secondary_memlocs_elim);
2394 /* Find what kind of insn this is. NOPERANDS gets number of operands.
2395 Make OPERANDS point to a vector of operand values.
2396 Make OPERAND_LOCS point to a vector of pointers to
2397 where the operands were found.
2398 Fill CONSTRAINTS and CONSTRAINTS1 with pointers to the
2399 constraint-strings for this insn.
2400 Return if the insn needs no reload processing. */
2402 switch (GET_CODE (body))
2412 /* Dispose quickly of (set (reg..) (reg..)) if both have hard regs and it
2413 is cheap to move between them. If it is not, there may not be an insn
2414 to do the copy, so we may need a reload. */
2415 if (GET_CODE (SET_DEST (body)) == REG
2416 && REGNO (SET_DEST (body)) < FIRST_PSEUDO_REGISTER
2417 && GET_CODE (SET_SRC (body)) == REG
2418 && REGNO (SET_SRC (body)) < FIRST_PSEUDO_REGISTER
2419 && REGISTER_MOVE_COST (REGNO_REG_CLASS (REGNO (SET_SRC (body))),
2420 REGNO_REG_CLASS (REGNO (SET_DEST (body)))) == 2)
2424 reload_n_operands = noperands = asm_noperands (body);
2427 /* This insn is an `asm' with operands. */
2429 insn_code_number = -1;
2430 this_insn_is_asm = 1;
2432 /* expand_asm_operands makes sure there aren't too many operands. */
2433 if (noperands > MAX_RECOG_OPERANDS)
2436 /* Now get the operand values and constraints out of the insn. */
2438 decode_asm_operands (body, recog_operand, recog_operand_loc,
2439 constraints, operand_mode);
2442 bcopy ((char *) constraints, (char *) constraints1,
2443 noperands * sizeof (char *));
2444 n_alternatives = n_occurrences (',', constraints[0]) + 1;
2445 for (i = 1; i < noperands; i++)
2446 if (n_alternatives != n_occurrences (',', constraints[i]) + 1)
2448 error_for_asm (insn, "operand constraints differ in number of alternatives");
2449 /* Avoid further trouble with this insn. */
2450 PATTERN (insn) = gen_rtx_USE (VOIDmode, const0_rtx);
2459 /* Ordinary insn: recognize it, get the operands via insn_extract
2460 and get the constraints. */
2462 insn_code_number = recog_memoized (insn);
2463 if (insn_code_number < 0)
2464 fatal_insn_not_found (insn);
2466 reload_n_operands = noperands = insn_n_operands[insn_code_number];
2467 n_alternatives = insn_n_alternatives[insn_code_number];
2468 /* Just return "no reloads" if insn has no operands with constraints. */
2469 if (n_alternatives == 0)
2471 insn_extract (insn);
2472 for (i = 0; i < noperands; i++)
2474 constraints[i] = constraints1[i]
2475 = insn_operand_constraint[insn_code_number][i];
2476 operand_mode[i] = insn_operand_mode[insn_code_number][i];
2485 /* If we will need to know, later, whether some pair of operands
2486 are the same, we must compare them now and save the result.
2487 Reloading the base and index registers will clobber them
2488 and afterward they will fail to match. */
2490 for (i = 0; i < noperands; i++)
2495 substed_operand[i] = recog_operand[i];
2498 modified[i] = RELOAD_READ;
2500 /* Scan this operand's constraint to see if it is an output operand,
2501 an in-out operand, is commutative, or should match another. */
2506 modified[i] = RELOAD_WRITE;
2508 modified[i] = RELOAD_READ_WRITE;
2511 /* The last operand should not be marked commutative. */
2512 if (i == noperands - 1)
2514 if (this_insn_is_asm)
2515 warning_for_asm (this_insn,
2516 "`%%' constraint used with last operand");
2523 else if (c >= '0' && c <= '9')
2526 operands_match[c][i]
2527 = operands_match_p (recog_operand[c], recog_operand[i]);
2529 /* An operand may not match itself. */
2532 if (this_insn_is_asm)
2533 warning_for_asm (this_insn,
2534 "operand %d has constraint %d", i, c);
2539 /* If C can be commuted with C+1, and C might need to match I,
2540 then C+1 might also need to match I. */
2541 if (commutative >= 0)
2543 if (c == commutative || c == commutative + 1)
2545 int other = c + (c == commutative ? 1 : -1);
2546 operands_match[other][i]
2547 = operands_match_p (recog_operand[other], recog_operand[i]);
2549 if (i == commutative || i == commutative + 1)
2551 int other = i + (i == commutative ? 1 : -1);
2552 operands_match[c][other]
2553 = operands_match_p (recog_operand[c], recog_operand[other]);
2555 /* Note that C is supposed to be less than I.
2556 No need to consider altering both C and I because in
2557 that case we would alter one into the other. */
2563 /* Examine each operand that is a memory reference or memory address
2564 and reload parts of the addresses into index registers.
2565 Also here any references to pseudo regs that didn't get hard regs
2566 but are equivalent to constants get replaced in the insn itself
2567 with those constants. Nobody will ever see them again.
2569 Finally, set up the preferred classes of each operand. */
2571 for (i = 0; i < noperands; i++)
2573 register RTX_CODE code = GET_CODE (recog_operand[i]);
2575 address_reloaded[i] = 0;
2576 operand_type[i] = (modified[i] == RELOAD_READ ? RELOAD_FOR_INPUT
2577 : modified[i] == RELOAD_WRITE ? RELOAD_FOR_OUTPUT
2580 = (modified[i] == RELOAD_READ ? RELOAD_FOR_INPUT_ADDRESS
2581 : modified[i] == RELOAD_WRITE ? RELOAD_FOR_OUTPUT_ADDRESS
2584 if (*constraints[i] == 0)
2585 /* Ignore things like match_operator operands. */
2587 else if (constraints[i][0] == 'p')
2589 find_reloads_address (VOIDmode, NULL_PTR,
2590 recog_operand[i], recog_operand_loc[i],
2591 i, operand_type[i], ind_levels, insn);
2593 /* If we now have a simple operand where we used to have a
2594 PLUS or MULT, re-recognize and try again. */
2595 if ((GET_RTX_CLASS (GET_CODE (*recog_operand_loc[i])) == 'o'
2596 || GET_CODE (*recog_operand_loc[i]) == SUBREG)
2597 && (GET_CODE (recog_operand[i]) == MULT
2598 || GET_CODE (recog_operand[i]) == PLUS))
2600 INSN_CODE (insn) = -1;
2601 find_reloads (insn, replace, ind_levels, live_known,
2606 substed_operand[i] = recog_operand[i] = *recog_operand_loc[i];
2608 else if (code == MEM)
2610 if (find_reloads_address (GET_MODE (recog_operand[i]),
2611 recog_operand_loc[i],
2612 XEXP (recog_operand[i], 0),
2613 &XEXP (recog_operand[i], 0),
2614 i, address_type[i], ind_levels, insn))
2615 address_reloaded[i] = 1;
2616 substed_operand[i] = recog_operand[i] = *recog_operand_loc[i];
2618 else if (code == SUBREG)
2620 rtx reg = SUBREG_REG (recog_operand[i]);
2622 = find_reloads_toplev (recog_operand[i], i, address_type[i],
2625 && &SET_DEST (set) == recog_operand_loc[i]);
2627 /* If we made a MEM to load (a part of) the stackslot of a pseudo
2628 that didn't get a hard register, emit a USE with a REG_EQUAL
2629 note in front so that we might inherit a previous, possibly
2632 if (GET_CODE (op) == MEM
2633 && GET_CODE (reg) == REG
2634 && (GET_MODE_SIZE (GET_MODE (reg))
2635 >= GET_MODE_SIZE (GET_MODE (op))))
2636 REG_NOTES (emit_insn_before (gen_rtx_USE (VOIDmode, reg), insn))
2637 = gen_rtx_EXPR_LIST (REG_EQUAL,
2638 reg_equiv_memory_loc[REGNO (reg)], NULL_RTX);
2640 substed_operand[i] = recog_operand[i] = *recog_operand_loc[i] = op;
2642 else if (code == PLUS || GET_RTX_CLASS (code) == '1')
2643 /* We can get a PLUS as an "operand" as a result of register
2644 elimination. See eliminate_regs and gen_reload. We handle
2645 a unary operator by reloading the operand. */
2646 substed_operand[i] = recog_operand[i] = *recog_operand_loc[i]
2647 = find_reloads_toplev (recog_operand[i], i, address_type[i],
2649 else if (code == REG)
2651 /* This is equivalent to calling find_reloads_toplev.
2652 The code is duplicated for speed.
2653 When we find a pseudo always equivalent to a constant,
2654 we replace it by the constant. We must be sure, however,
2655 that we don't try to replace it in the insn in which it
2657 register int regno = REGNO (recog_operand[i]);
2658 if (reg_equiv_constant[regno] != 0
2659 && (set == 0 || &SET_DEST (set) != recog_operand_loc[i]))
2661 /* Record the existing mode so that the check if constants are
2662 allowed will work when operand_mode isn't specified. */
2664 if (operand_mode[i] == VOIDmode)
2665 operand_mode[i] = GET_MODE (recog_operand[i]);
2667 substed_operand[i] = recog_operand[i]
2668 = reg_equiv_constant[regno];
2670 #if 0 /* This might screw code in reload1.c to delete prior output-reload
2671 that feeds this insn. */
2672 if (reg_equiv_mem[regno] != 0)
2673 substed_operand[i] = recog_operand[i]
2674 = reg_equiv_mem[regno];
2676 if (reg_equiv_address[regno] != 0)
2678 /* If reg_equiv_address is not a constant address, copy it,
2679 since it may be shared. */
2680 /* We must rerun eliminate_regs, in case the elimination
2681 offsets have changed. */
2682 rtx address = XEXP (eliminate_regs (reg_equiv_memory_loc[regno],
2686 if (rtx_varies_p (address))
2687 address = copy_rtx (address);
2689 /* Emit a USE that shows what register is being used/modified. */
2690 REG_NOTES (emit_insn_before (gen_rtx_USE (VOIDmode,
2693 = gen_rtx_EXPR_LIST (REG_EQUAL,
2694 reg_equiv_memory_loc[regno],
2697 *recog_operand_loc[i] = recog_operand[i]
2698 = gen_rtx_MEM (GET_MODE (recog_operand[i]), address);
2699 RTX_UNCHANGING_P (recog_operand[i])
2700 = RTX_UNCHANGING_P (regno_reg_rtx[regno]);
2701 find_reloads_address (GET_MODE (recog_operand[i]),
2702 recog_operand_loc[i],
2703 XEXP (recog_operand[i], 0),
2704 &XEXP (recog_operand[i], 0),
2705 i, address_type[i], ind_levels, insn);
2706 substed_operand[i] = recog_operand[i] = *recog_operand_loc[i];
2709 /* If the operand is still a register (we didn't replace it with an
2710 equivalent), get the preferred class to reload it into. */
2711 code = GET_CODE (recog_operand[i]);
2713 = ((code == REG && REGNO (recog_operand[i]) >= FIRST_PSEUDO_REGISTER)
2714 ? reg_preferred_class (REGNO (recog_operand[i])) : NO_REGS);
2716 = (code == REG && REGNO (recog_operand[i]) >= FIRST_PSEUDO_REGISTER
2717 && reg_alternate_class (REGNO (recog_operand[i])) == NO_REGS);
2720 /* If this is simply a copy from operand 1 to operand 0, merge the
2721 preferred classes for the operands. */
2722 if (set != 0 && noperands >= 2 && recog_operand[0] == SET_DEST (set)
2723 && recog_operand[1] == SET_SRC (set))
2725 preferred_class[0] = preferred_class[1]
2726 = reg_class_subunion[(int) preferred_class[0]][(int) preferred_class[1]];
2727 pref_or_nothing[0] |= pref_or_nothing[1];
2728 pref_or_nothing[1] |= pref_or_nothing[0];
2731 /* Now see what we need for pseudo-regs that didn't get hard regs
2732 or got the wrong kind of hard reg. For this, we must consider
2733 all the operands together against the register constraints. */
2735 best = MAX_RECOG_OPERANDS * 2 + 600;
2738 goal_alternative_swapped = 0;
2741 /* The constraints are made of several alternatives.
2742 Each operand's constraint looks like foo,bar,... with commas
2743 separating the alternatives. The first alternatives for all
2744 operands go together, the second alternatives go together, etc.
2746 First loop over alternatives. */
2748 for (this_alternative_number = 0;
2749 this_alternative_number < n_alternatives;
2750 this_alternative_number++)
2752 /* Loop over operands for one constraint alternative. */
2753 /* LOSERS counts those that don't fit this alternative
2754 and would require loading. */
2756 /* BAD is set to 1 if it some operand can't fit this alternative
2757 even after reloading. */
2759 /* REJECT is a count of how undesirable this alternative says it is
2760 if any reloading is required. If the alternative matches exactly
2761 then REJECT is ignored, but otherwise it gets this much
2762 counted against it in addition to the reloading needed. Each
2763 ? counts three times here since we want the disparaging caused by
2764 a bad register class to only count 1/3 as much. */
2767 this_earlyclobber = 0;
2769 for (i = 0; i < noperands; i++)
2771 register char *p = constraints[i];
2772 register int win = 0;
2773 /* 0 => this operand can be reloaded somehow for this alternative */
2775 /* 0 => this operand can be reloaded if the alternative allows regs. */
2778 register rtx operand = recog_operand[i];
2780 /* Nonzero means this is a MEM that must be reloaded into a reg
2781 regardless of what the constraint says. */
2782 int force_reload = 0;
2784 /* Nonzero if a constant forced into memory would be OK for this
2787 int earlyclobber = 0;
2789 /* If the predicate accepts a unary operator, it means that
2790 we need to reload the operand, but do not do this for
2791 match_operator and friends. */
2792 if (GET_RTX_CLASS (GET_CODE (operand)) == '1' && *p != 0)
2793 operand = XEXP (operand, 0);
2795 /* If the operand is a SUBREG, extract
2796 the REG or MEM (or maybe even a constant) within.
2797 (Constants can occur as a result of reg_equiv_constant.) */
2799 while (GET_CODE (operand) == SUBREG)
2801 offset += SUBREG_WORD (operand);
2802 operand = SUBREG_REG (operand);
2803 /* Force reload if this is a constant or PLUS or if there may
2804 be a problem accessing OPERAND in the outer mode. */
2805 if (CONSTANT_P (operand)
2806 || GET_CODE (operand) == PLUS
2807 /* We must force a reload of paradoxical SUBREGs
2808 of a MEM because the alignment of the inner value
2809 may not be enough to do the outer reference. On
2810 big-endian machines, it may also reference outside
2813 On machines that extend byte operations and we have a
2814 SUBREG where both the inner and outer modes are no wider
2815 than a word and the inner mode is narrower, is integral,
2816 and gets extended when loaded from memory, combine.c has
2817 made assumptions about the behavior of the machine in such
2818 register access. If the data is, in fact, in memory we
2819 must always load using the size assumed to be in the
2820 register and let the insn do the different-sized
2823 This is doubly true if WORD_REGISTER_OPERATIONS. In
2824 this case eliminate_regs has left non-paradoxical
2825 subregs for push_reloads to see. Make sure it does
2826 by forcing the reload.
2828 ??? When is it right at this stage to have a subreg
2829 of a mem that is _not_ to be handled specialy? IMO
2830 those should have been reduced to just a mem. */
2831 || ((GET_CODE (operand) == MEM
2832 || (GET_CODE (operand)== REG
2833 && REGNO (operand) >= FIRST_PSEUDO_REGISTER))
2834 #ifndef WORD_REGISTER_OPERATIONS
2835 && (((GET_MODE_BITSIZE (GET_MODE (operand))
2836 < BIGGEST_ALIGNMENT)
2837 && (GET_MODE_SIZE (operand_mode[i])
2838 > GET_MODE_SIZE (GET_MODE (operand))))
2839 || (GET_CODE (operand) == MEM && BYTES_BIG_ENDIAN)
2840 #ifdef LOAD_EXTEND_OP
2841 || (GET_MODE_SIZE (operand_mode[i]) <= UNITS_PER_WORD
2842 && (GET_MODE_SIZE (GET_MODE (operand))
2844 && (GET_MODE_SIZE (operand_mode[i])
2845 > GET_MODE_SIZE (GET_MODE (operand)))
2846 && INTEGRAL_MODE_P (GET_MODE (operand))
2847 && LOAD_EXTEND_OP (GET_MODE (operand)) != NIL)
2852 /* Subreg of a hard reg which can't handle the subreg's mode
2853 or which would handle that mode in the wrong number of
2854 registers for subregging to work. */
2855 || (GET_CODE (operand) == REG
2856 && REGNO (operand) < FIRST_PSEUDO_REGISTER
2857 && ((GET_MODE_SIZE (operand_mode[i]) <= UNITS_PER_WORD
2858 && (GET_MODE_SIZE (GET_MODE (operand))
2860 && ((GET_MODE_SIZE (GET_MODE (operand))
2862 != HARD_REGNO_NREGS (REGNO (operand),
2863 GET_MODE (operand))))
2864 || ! HARD_REGNO_MODE_OK (REGNO (operand) + offset,
2869 this_alternative[i] = (int) NO_REGS;
2870 this_alternative_win[i] = 0;
2871 this_alternative_offmemok[i] = 0;
2872 this_alternative_earlyclobber[i] = 0;
2873 this_alternative_matches[i] = -1;
2875 /* An empty constraint or empty alternative
2876 allows anything which matched the pattern. */
2877 if (*p == 0 || *p == ',')
2880 /* Scan this alternative's specs for this operand;
2881 set WIN if the operand fits any letter in this alternative.
2882 Otherwise, clear BADOP if this operand could
2883 fit some letter after reloads,
2884 or set WINREG if this operand could fit after reloads
2885 provided the constraint allows some registers. */
2887 while (*p && (c = *p++) != ',')
2896 /* The last operand should not be marked commutative. */
2897 if (i != noperands - 1)
2910 /* Ignore rest of this alternative as far as
2911 reloading is concerned. */
2912 while (*p && *p != ',') p++;
2921 this_alternative_matches[i] = c;
2922 /* We are supposed to match a previous operand.
2923 If we do, we win if that one did.
2924 If we do not, count both of the operands as losers.
2925 (This is too conservative, since most of the time
2926 only a single reload insn will be needed to make
2927 the two operands win. As a result, this alternative
2928 may be rejected when it is actually desirable.) */
2929 if ((swapped && (c != commutative || i != commutative + 1))
2930 /* If we are matching as if two operands were swapped,
2931 also pretend that operands_match had been computed
2933 But if I is the second of those and C is the first,
2934 don't exchange them, because operands_match is valid
2935 only on one side of its diagonal. */
2937 [(c == commutative || c == commutative + 1)
2938 ? 2*commutative + 1 - c : c]
2939 [(i == commutative || i == commutative + 1)
2940 ? 2*commutative + 1 - i : i])
2941 : operands_match[c][i])
2943 /* If we are matching a non-offsettable address where an
2944 offsettable address was expected, then we must reject
2945 this combination, because we can't reload it. */
2946 if (this_alternative_offmemok[c]
2947 && GET_CODE (recog_operand[c]) == MEM
2948 && this_alternative[c] == (int) NO_REGS
2949 && ! this_alternative_win[c])
2952 win = this_alternative_win[c];
2956 /* Operands don't match. */
2958 /* Retroactively mark the operand we had to match
2959 as a loser, if it wasn't already. */
2960 if (this_alternative_win[c])
2962 this_alternative_win[c] = 0;
2963 if (this_alternative[c] == (int) NO_REGS)
2965 /* But count the pair only once in the total badness of
2966 this alternative, if the pair can be a dummy reload. */
2968 = find_dummy_reload (recog_operand[i], recog_operand[c],
2969 recog_operand_loc[i], recog_operand_loc[c],
2970 operand_mode[i], operand_mode[c],
2971 this_alternative[c], -1,
2972 this_alternative_earlyclobber[c]);
2977 /* This can be fixed with reloads if the operand
2978 we are supposed to match can be fixed with reloads. */
2980 this_alternative[i] = this_alternative[c];
2982 /* If we have to reload this operand and some previous
2983 operand also had to match the same thing as this
2984 operand, we don't know how to do that. So reject this
2986 if (! win || force_reload)
2987 for (j = 0; j < i; j++)
2988 if (this_alternative_matches[j]
2989 == this_alternative_matches[i])
2995 /* All necessary reloads for an address_operand
2996 were handled in find_reloads_address. */
2997 this_alternative[i] = (int) BASE_REG_CLASS;
3004 if (GET_CODE (operand) == MEM
3005 || (GET_CODE (operand) == REG
3006 && REGNO (operand) >= FIRST_PSEUDO_REGISTER
3007 && reg_renumber[REGNO (operand)] < 0))
3009 if (CONSTANT_P (operand)
3010 /* force_const_mem does not accept HIGH. */
3011 && GET_CODE (operand) != HIGH)
3017 if (GET_CODE (operand) == MEM
3018 && ! address_reloaded[i]
3019 && (GET_CODE (XEXP (operand, 0)) == PRE_DEC
3020 || GET_CODE (XEXP (operand, 0)) == POST_DEC))
3025 if (GET_CODE (operand) == MEM
3026 && ! address_reloaded[i]
3027 && (GET_CODE (XEXP (operand, 0)) == PRE_INC
3028 || GET_CODE (XEXP (operand, 0)) == POST_INC))
3032 /* Memory operand whose address is not offsettable. */
3036 if (GET_CODE (operand) == MEM
3037 && ! (ind_levels ? offsettable_memref_p (operand)
3038 : offsettable_nonstrict_memref_p (operand))
3039 /* Certain mem addresses will become offsettable
3040 after they themselves are reloaded. This is important;
3041 we don't want our own handling of unoffsettables
3042 to override the handling of reg_equiv_address. */
3043 && !(GET_CODE (XEXP (operand, 0)) == REG
3045 || reg_equiv_address[REGNO (XEXP (operand, 0))] != 0)))
3049 /* Memory operand whose address is offsettable. */
3053 if ((GET_CODE (operand) == MEM
3054 /* If IND_LEVELS, find_reloads_address won't reload a
3055 pseudo that didn't get a hard reg, so we have to
3056 reject that case. */
3057 && (ind_levels ? offsettable_memref_p (operand)
3058 : offsettable_nonstrict_memref_p (operand)))
3059 /* A reloaded auto-increment address is offsettable,
3060 because it is now just a simple register indirect. */
3061 || (GET_CODE (operand) == MEM
3062 && address_reloaded[i]
3063 && (GET_CODE (XEXP (operand, 0)) == PRE_INC
3064 || GET_CODE (XEXP (operand, 0)) == PRE_DEC
3065 || GET_CODE (XEXP (operand, 0)) == POST_INC
3066 || GET_CODE (XEXP (operand, 0)) == POST_DEC))
3067 /* Certain mem addresses will become offsettable
3068 after they themselves are reloaded. This is important;
3069 we don't want our own handling of unoffsettables
3070 to override the handling of reg_equiv_address. */
3071 || (GET_CODE (operand) == MEM
3072 && GET_CODE (XEXP (operand, 0)) == REG
3074 || reg_equiv_address[REGNO (XEXP (operand, 0))] != 0))
3075 || (GET_CODE (operand) == REG
3076 && REGNO (operand) >= FIRST_PSEUDO_REGISTER
3077 && reg_renumber[REGNO (operand)] < 0
3078 /* If reg_equiv_address is nonzero, we will be
3079 loading it into a register; hence it will be
3080 offsettable, but we cannot say that reg_equiv_mem
3081 is offsettable without checking. */
3082 && ((reg_equiv_mem[REGNO (operand)] != 0
3083 && offsettable_memref_p (reg_equiv_mem[REGNO (operand)]))
3084 || (reg_equiv_address[REGNO (operand)] != 0))))
3086 /* force_const_mem does not accept HIGH. */
3087 if ((CONSTANT_P (operand) && GET_CODE (operand) != HIGH)
3088 || GET_CODE (operand) == MEM)
3095 /* Output operand that is stored before the need for the
3096 input operands (and their index registers) is over. */
3097 earlyclobber = 1, this_earlyclobber = 1;
3101 #ifndef REAL_ARITHMETIC
3102 /* Match any floating double constant, but only if
3103 we can examine the bits of it reliably. */
3104 if ((HOST_FLOAT_FORMAT != TARGET_FLOAT_FORMAT
3105 || HOST_BITS_PER_WIDE_INT != BITS_PER_WORD)
3106 && GET_MODE (operand) != VOIDmode && ! flag_pretend_float)
3109 if (GET_CODE (operand) == CONST_DOUBLE)
3114 if (GET_CODE (operand) == CONST_DOUBLE)
3120 if (GET_CODE (operand) == CONST_DOUBLE
3121 && CONST_DOUBLE_OK_FOR_LETTER_P (operand, c))
3126 if (GET_CODE (operand) == CONST_INT
3127 || (GET_CODE (operand) == CONST_DOUBLE
3128 && GET_MODE (operand) == VOIDmode))
3131 if (CONSTANT_P (operand)
3132 #ifdef LEGITIMATE_PIC_OPERAND_P
3133 && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (operand))
3140 if (GET_CODE (operand) == CONST_INT
3141 || (GET_CODE (operand) == CONST_DOUBLE
3142 && GET_MODE (operand) == VOIDmode))
3154 if (GET_CODE (operand) == CONST_INT
3155 && CONST_OK_FOR_LETTER_P (INTVAL (operand), c))
3165 /* A PLUS is never a valid operand, but reload can make
3166 it from a register when eliminating registers. */
3167 && GET_CODE (operand) != PLUS
3168 /* A SCRATCH is not a valid operand. */
3169 && GET_CODE (operand) != SCRATCH
3170 #ifdef LEGITIMATE_PIC_OPERAND_P
3171 && (! CONSTANT_P (operand)
3173 || LEGITIMATE_PIC_OPERAND_P (operand))
3175 && (GENERAL_REGS == ALL_REGS
3176 || GET_CODE (operand) != REG
3177 || (REGNO (operand) >= FIRST_PSEUDO_REGISTER
3178 && reg_renumber[REGNO (operand)] < 0)))
3180 /* Drop through into 'r' case */
3184 = (int) reg_class_subunion[this_alternative[i]][(int) GENERAL_REGS];
3187 #ifdef EXTRA_CONSTRAINT
3193 if (EXTRA_CONSTRAINT (operand, c))
3200 = (int) reg_class_subunion[this_alternative[i]][(int) REG_CLASS_FROM_LETTER (c)];
3203 if (GET_MODE (operand) == BLKmode)
3206 if (GET_CODE (operand) == REG
3207 && reg_fits_class_p (operand, this_alternative[i],
3208 offset, GET_MODE (recog_operand[i])))
3215 /* If this operand could be handled with a reg,
3216 and some reg is allowed, then this operand can be handled. */
3217 if (winreg && this_alternative[i] != (int) NO_REGS)
3220 /* Record which operands fit this alternative. */
3221 this_alternative_earlyclobber[i] = earlyclobber;
3222 if (win && ! force_reload)
3223 this_alternative_win[i] = 1;
3226 int const_to_mem = 0;
3228 this_alternative_offmemok[i] = offmemok;
3232 /* Alternative loses if it has no regs for a reg operand. */
3233 if (GET_CODE (operand) == REG
3234 && this_alternative[i] == (int) NO_REGS
3235 && this_alternative_matches[i] < 0)
3239 /* If this is a pseudo-register that is set in the previous
3240 insns, there's a good chance that it will already be in a
3241 spill register and we can use that spill register. So
3242 make this case cheaper.
3244 Disabled for egcs. egcs has better inheritance code and
3245 this change causes problems with the improved reload
3246 inheritance code. */
3247 if (GET_CODE (operand) == REG
3248 && REGNO (operand) >= FIRST_PSEUDO_REGISTER
3249 && REGNO (operand) == last_output_reload_regno)
3253 /* If this is a constant that is reloaded into the desired
3254 class by copying it to memory first, count that as another
3255 reload. This is consistent with other code and is
3256 required to avoid choosing another alternative when
3257 the constant is moved into memory by this function on
3258 an early reload pass. Note that the test here is
3259 precisely the same as in the code below that calls
3261 if (CONSTANT_P (operand)
3262 /* force_const_mem does not accept HIGH. */
3263 && GET_CODE (operand) != HIGH
3264 && ((PREFERRED_RELOAD_CLASS (operand,
3265 (enum reg_class) this_alternative[i])
3267 || no_input_reloads)
3268 && operand_mode[i] != VOIDmode)
3271 if (this_alternative[i] != (int) NO_REGS)
3275 /* If we can't reload this value at all, reject this
3276 alternative. Note that we could also lose due to
3277 LIMIT_RELOAD_RELOAD_CLASS, but we don't check that
3280 if (! CONSTANT_P (operand)
3281 && (enum reg_class) this_alternative[i] != NO_REGS
3282 && (PREFERRED_RELOAD_CLASS (operand,
3283 (enum reg_class) this_alternative[i])
3287 /* Alternative loses if it requires a type of reload not
3288 permitted for this insn. We can always reload SCRATCH
3289 and objects with a REG_UNUSED note. */
3290 else if (GET_CODE (operand) != SCRATCH
3291 && modified[i] != RELOAD_READ && no_output_reloads
3292 && ! find_reg_note (insn, REG_UNUSED, operand))
3294 else if (modified[i] != RELOAD_WRITE && no_input_reloads
3299 /* We prefer to reload pseudos over reloading other things,
3300 since such reloads may be able to be eliminated later.
3301 If we are reloading a SCRATCH, we won't be generating any
3302 insns, just using a register, so it is also preferred.
3303 So bump REJECT in other cases. Don't do this in the
3304 case where we are forcing a constant into memory and
3305 it will then win since we don't want to have a different
3306 alternative match then. */
3307 if (! (GET_CODE (operand) == REG
3308 && REGNO (operand) >= FIRST_PSEUDO_REGISTER)
3309 && GET_CODE (operand) != SCRATCH
3310 && ! (const_to_mem && constmemok))
3313 /* Input reloads can be inherited more often than output
3314 reloads can be removed, so penalize output reloads. */
3315 if (operand_type[i] != RELOAD_FOR_INPUT
3316 && GET_CODE (operand) != SCRATCH)
3320 /* If this operand is a pseudo register that didn't get a hard
3321 reg and this alternative accepts some register, see if the
3322 class that we want is a subset of the preferred class for this
3323 register. If not, but it intersects that class, use the
3324 preferred class instead. If it does not intersect the preferred
3325 class, show that usage of this alternative should be discouraged;
3326 it will be discouraged more still if the register is `preferred
3327 or nothing'. We do this because it increases the chance of
3328 reusing our spill register in a later insn and avoiding a pair
3329 of memory stores and loads.
3331 Don't bother with this if this alternative will accept this
3334 Don't do this for a multiword operand, since it is only a
3335 small win and has the risk of requiring more spill registers,
3336 which could cause a large loss.
3338 Don't do this if the preferred class has only one register
3339 because we might otherwise exhaust the class. */
3342 if (! win && this_alternative[i] != (int) NO_REGS
3343 && GET_MODE_SIZE (operand_mode[i]) <= UNITS_PER_WORD
3344 && reg_class_size[(int) preferred_class[i]] > 1)
3346 if (! reg_class_subset_p (this_alternative[i],
3347 preferred_class[i]))
3349 /* Since we don't have a way of forming the intersection,
3350 we just do something special if the preferred class
3351 is a subset of the class we have; that's the most
3352 common case anyway. */
3353 if (reg_class_subset_p (preferred_class[i],
3354 this_alternative[i]))
3355 this_alternative[i] = (int) preferred_class[i];
3357 reject += (2 + 2 * pref_or_nothing[i]);
3362 /* Now see if any output operands that are marked "earlyclobber"
3363 in this alternative conflict with any input operands
3364 or any memory addresses. */
3366 for (i = 0; i < noperands; i++)
3367 if (this_alternative_earlyclobber[i]
3368 && this_alternative_win[i])
3370 struct decomposition early_data;
3372 early_data = decompose (recog_operand[i]);
3374 if (modified[i] == RELOAD_READ)
3376 if (this_insn_is_asm)
3377 warning_for_asm (this_insn,
3378 "`&' constraint used with input operand");
3384 if (this_alternative[i] == NO_REGS)
3386 this_alternative_earlyclobber[i] = 0;
3387 if (this_insn_is_asm)
3388 error_for_asm (this_insn,
3389 "`&' constraint used with no register class");
3394 for (j = 0; j < noperands; j++)
3395 /* Is this an input operand or a memory ref? */
3396 if ((GET_CODE (recog_operand[j]) == MEM
3397 || modified[j] != RELOAD_WRITE)
3399 /* Ignore things like match_operator operands. */
3400 && *constraints1[j] != 0
3401 /* Don't count an input operand that is constrained to match
3402 the early clobber operand. */
3403 && ! (this_alternative_matches[j] == i
3404 && rtx_equal_p (recog_operand[i], recog_operand[j]))
3405 /* Is it altered by storing the earlyclobber operand? */
3406 && !immune_p (recog_operand[j], recog_operand[i], early_data))
3408 /* If the output is in a single-reg class,
3409 it's costly to reload it, so reload the input instead. */
3410 if (reg_class_size[this_alternative[i]] == 1
3411 && (GET_CODE (recog_operand[j]) == REG
3412 || GET_CODE (recog_operand[j]) == SUBREG))
3415 this_alternative_win[j] = 0;
3420 /* If an earlyclobber operand conflicts with something,
3421 it must be reloaded, so request this and count the cost. */
3425 this_alternative_win[i] = 0;
3426 for (j = 0; j < noperands; j++)
3427 if (this_alternative_matches[j] == i
3428 && this_alternative_win[j])
3430 this_alternative_win[j] = 0;
3436 /* If one alternative accepts all the operands, no reload required,
3437 choose that alternative; don't consider the remaining ones. */
3440 /* Unswap these so that they are never swapped at `finish'. */
3441 if (commutative >= 0)
3443 recog_operand[commutative] = substed_operand[commutative];
3444 recog_operand[commutative + 1]
3445 = substed_operand[commutative + 1];
3447 for (i = 0; i < noperands; i++)
3449 goal_alternative_win[i] = 1;
3450 goal_alternative[i] = this_alternative[i];
3451 goal_alternative_offmemok[i] = this_alternative_offmemok[i];
3452 goal_alternative_matches[i] = this_alternative_matches[i];
3453 goal_alternative_earlyclobber[i]
3454 = this_alternative_earlyclobber[i];
3456 goal_alternative_number = this_alternative_number;
3457 goal_alternative_swapped = swapped;
3458 goal_earlyclobber = this_earlyclobber;
3462 /* REJECT, set by the ! and ? constraint characters and when a register
3463 would be reloaded into a non-preferred class, discourages the use of
3464 this alternative for a reload goal. REJECT is incremented by six
3465 for each ? and two for each non-preferred class. */
3466 losers = losers * 6 + reject;
3468 /* If this alternative can be made to work by reloading,
3469 and it needs less reloading than the others checked so far,
3470 record it as the chosen goal for reloading. */
3471 if (! bad && best > losers)
3473 for (i = 0; i < noperands; i++)
3475 goal_alternative[i] = this_alternative[i];
3476 goal_alternative_win[i] = this_alternative_win[i];
3477 goal_alternative_offmemok[i] = this_alternative_offmemok[i];
3478 goal_alternative_matches[i] = this_alternative_matches[i];
3479 goal_alternative_earlyclobber[i]
3480 = this_alternative_earlyclobber[i];
3482 goal_alternative_swapped = swapped;
3484 goal_alternative_number = this_alternative_number;
3485 goal_earlyclobber = this_earlyclobber;
3489 /* If insn is commutative (it's safe to exchange a certain pair of operands)
3490 then we need to try each alternative twice,
3491 the second time matching those two operands
3492 as if we had exchanged them.
3493 To do this, really exchange them in operands.
3495 If we have just tried the alternatives the second time,
3496 return operands to normal and drop through. */
3498 if (commutative >= 0)
3503 register enum reg_class tclass;
3506 recog_operand[commutative] = substed_operand[commutative + 1];
3507 recog_operand[commutative + 1] = substed_operand[commutative];
3509 tclass = preferred_class[commutative];
3510 preferred_class[commutative] = preferred_class[commutative + 1];
3511 preferred_class[commutative + 1] = tclass;
3513 t = pref_or_nothing[commutative];
3514 pref_or_nothing[commutative] = pref_or_nothing[commutative + 1];
3515 pref_or_nothing[commutative + 1] = t;
3517 bcopy ((char *) constraints1, (char *) constraints,
3518 noperands * sizeof (char *));
3523 recog_operand[commutative] = substed_operand[commutative];
3524 recog_operand[commutative + 1] = substed_operand[commutative + 1];
3528 /* The operands don't meet the constraints.
3529 goal_alternative describes the alternative
3530 that we could reach by reloading the fewest operands.
3531 Reload so as to fit it. */
3533 if (best == MAX_RECOG_OPERANDS * 2 + 600)
3535 /* No alternative works with reloads?? */
3536 if (insn_code_number >= 0)
3538 error_for_asm (insn, "inconsistent operand constraints in an `asm'");
3539 /* Avoid further trouble with this insn. */
3540 PATTERN (insn) = gen_rtx_USE (VOIDmode, const0_rtx);
3545 /* Jump to `finish' from above if all operands are valid already.
3546 In that case, goal_alternative_win is all 1. */
3549 /* Right now, for any pair of operands I and J that are required to match,
3551 goal_alternative_matches[J] is I.
3552 Set up goal_alternative_matched as the inverse function:
3553 goal_alternative_matched[I] = J. */
3555 for (i = 0; i < noperands; i++)
3556 goal_alternative_matched[i] = -1;
3558 for (i = 0; i < noperands; i++)
3559 if (! goal_alternative_win[i]
3560 && goal_alternative_matches[i] >= 0)
3561 goal_alternative_matched[goal_alternative_matches[i]] = i;
3563 /* If the best alternative is with operands 1 and 2 swapped,
3564 consider them swapped before reporting the reloads. Update the
3565 operand numbers of any reloads already pushed. */
3567 if (goal_alternative_swapped)
3571 tem = substed_operand[commutative];
3572 substed_operand[commutative] = substed_operand[commutative + 1];
3573 substed_operand[commutative + 1] = tem;
3574 tem = recog_operand[commutative];
3575 recog_operand[commutative] = recog_operand[commutative + 1];
3576 recog_operand[commutative + 1] = tem;
3578 for (i = 0; i < n_reloads; i++)
3580 if (reload_opnum[i] == commutative)
3581 reload_opnum[i] = commutative + 1;
3582 else if (reload_opnum[i] == commutative + 1)
3583 reload_opnum[i] = commutative;
3587 /* Perform whatever substitutions on the operands we are supposed
3588 to make due to commutativity or replacement of registers
3589 with equivalent constants or memory slots. */
3591 for (i = 0; i < noperands; i++)
3593 *recog_operand_loc[i] = substed_operand[i];
3594 /* While we are looping on operands, initialize this. */
3595 operand_reloadnum[i] = -1;
3597 /* If this is an earlyclobber operand, we need to widen the scope.
3598 The reload must remain valid from the start of the insn being
3599 reloaded until after the operand is stored into its destination.
3600 We approximate this with RELOAD_OTHER even though we know that we
3601 do not conflict with RELOAD_FOR_INPUT_ADDRESS reloads.
3603 One special case that is worth checking is when we have an
3604 output that is earlyclobber but isn't used past the insn (typically
3605 a SCRATCH). In this case, we only need have the reload live
3606 through the insn itself, but not for any of our input or output
3608 But we must not accidentally narrow the scope of an existing
3609 RELOAD_OTHER reload - leave these alone.
3611 In any case, anything needed to address this operand can remain
3612 however they were previously categorized. */
3614 if (goal_alternative_earlyclobber[i] && operand_type[i] != RELOAD_OTHER)
3616 = (find_reg_note (insn, REG_UNUSED, recog_operand[i])
3617 ? RELOAD_FOR_INSN : RELOAD_OTHER);
3620 /* Any constants that aren't allowed and can't be reloaded
3621 into registers are here changed into memory references. */
3622 for (i = 0; i < noperands; i++)
3623 if (! goal_alternative_win[i]
3624 && CONSTANT_P (recog_operand[i])
3625 /* force_const_mem does not accept HIGH. */
3626 && GET_CODE (recog_operand[i]) != HIGH
3627 && ((PREFERRED_RELOAD_CLASS (recog_operand[i],
3628 (enum reg_class) goal_alternative[i])
3630 || no_input_reloads)
3631 && operand_mode[i] != VOIDmode)
3633 *recog_operand_loc[i] = recog_operand[i]
3634 = find_reloads_toplev (force_const_mem (operand_mode[i],
3636 i, address_type[i], ind_levels, 0);
3637 if (alternative_allows_memconst (constraints1[i],
3638 goal_alternative_number))
3639 goal_alternative_win[i] = 1;
3642 /* Record the values of the earlyclobber operands for the caller. */
3643 if (goal_earlyclobber)
3644 for (i = 0; i < noperands; i++)
3645 if (goal_alternative_earlyclobber[i])
3646 reload_earlyclobbers[n_earlyclobbers++] = recog_operand[i];
3648 /* Now record reloads for all the operands that need them. */
3649 last_output_reload_regno = -1;
3650 for (i = 0; i < noperands; i++)
3651 if (! goal_alternative_win[i])
3653 /* Operands that match previous ones have already been handled. */
3654 if (goal_alternative_matches[i] >= 0)
3656 /* Handle an operand with a nonoffsettable address
3657 appearing where an offsettable address will do
3658 by reloading the address into a base register.
3660 ??? We can also do this when the operand is a register and
3661 reg_equiv_mem is not offsettable, but this is a bit tricky,
3662 so we don't bother with it. It may not be worth doing. */
3663 else if (goal_alternative_matched[i] == -1
3664 && goal_alternative_offmemok[i]
3665 && GET_CODE (recog_operand[i]) == MEM)
3667 operand_reloadnum[i]
3668 = push_reload (XEXP (recog_operand[i], 0), NULL_RTX,
3669 &XEXP (recog_operand[i], 0), NULL_PTR,
3670 BASE_REG_CLASS, GET_MODE (XEXP (recog_operand[i], 0)),
3671 VOIDmode, 0, 0, i, RELOAD_FOR_INPUT);
3672 reload_inc[operand_reloadnum[i]]
3673 = GET_MODE_SIZE (GET_MODE (recog_operand[i]));
3675 /* If this operand is an output, we will have made any
3676 reloads for its address as RELOAD_FOR_OUTPUT_ADDRESS, but
3677 now we are treating part of the operand as an input, so
3678 we must change these to RELOAD_FOR_INPUT_ADDRESS. */
3680 if (modified[i] == RELOAD_WRITE)
3682 for (j = 0; j < n_reloads; j++)
3684 if (reload_opnum[j] == i)
3686 if (reload_when_needed[j] == RELOAD_FOR_OUTPUT_ADDRESS)
3687 reload_when_needed[j] = RELOAD_FOR_INPUT_ADDRESS;
3688 else if (reload_when_needed[j]
3689 == RELOAD_FOR_OUTADDR_ADDRESS)
3690 reload_when_needed[j] = RELOAD_FOR_INPADDR_ADDRESS;
3695 else if (goal_alternative_matched[i] == -1)
3697 operand_reloadnum[i]
3698 = push_reload ((modified[i] != RELOAD_WRITE
3699 ? recog_operand[i] : 0),
3700 modified[i] != RELOAD_READ ? recog_operand[i] : 0,
3701 (modified[i] != RELOAD_WRITE
3702 ? recog_operand_loc[i] : 0),
3703 (modified[i] != RELOAD_READ
3704 ? recog_operand_loc[i] : 0),
3705 (enum reg_class) goal_alternative[i],
3706 (modified[i] == RELOAD_WRITE
3707 ? VOIDmode : operand_mode[i]),
3708 (modified[i] == RELOAD_READ
3709 ? VOIDmode : operand_mode[i]),
3710 (insn_code_number < 0 ? 0
3711 : insn_operand_strict_low[insn_code_number][i]),
3712 0, i, operand_type[i]);
3713 if (modified[i] != RELOAD_READ
3714 && GET_CODE (recog_operand[i]) == REG)
3715 last_output_reload_regno = REGNO (recog_operand[i]);
3717 /* In a matching pair of operands, one must be input only
3718 and the other must be output only.
3719 Pass the input operand as IN and the other as OUT. */
3720 else if (modified[i] == RELOAD_READ
3721 && modified[goal_alternative_matched[i]] == RELOAD_WRITE)
3723 operand_reloadnum[i]
3724 = push_reload (recog_operand[i],
3725 recog_operand[goal_alternative_matched[i]],
3726 recog_operand_loc[i],
3727 recog_operand_loc[goal_alternative_matched[i]],
3728 (enum reg_class) goal_alternative[i],
3730 operand_mode[goal_alternative_matched[i]],
3731 0, 0, i, RELOAD_OTHER);
3732 operand_reloadnum[goal_alternative_matched[i]] = output_reloadnum;
3733 if (GET_CODE (recog_operand[goal_alternative_matched[i]]) == REG)
3734 last_output_reload_regno
3735 = REGNO (recog_operand[goal_alternative_matched[i]]);
3737 else if (modified[i] == RELOAD_WRITE
3738 && modified[goal_alternative_matched[i]] == RELOAD_READ)
3740 operand_reloadnum[goal_alternative_matched[i]]
3741 = push_reload (recog_operand[goal_alternative_matched[i]],
3743 recog_operand_loc[goal_alternative_matched[i]],
3744 recog_operand_loc[i],
3745 (enum reg_class) goal_alternative[i],
3746 operand_mode[goal_alternative_matched[i]],
3748 0, 0, i, RELOAD_OTHER);
3749 operand_reloadnum[i] = output_reloadnum;
3750 if (GET_CODE (recog_operand[i]) == REG)
3751 last_output_reload_regno = REGNO (recog_operand[i]);
3753 else if (insn_code_number >= 0)
3757 error_for_asm (insn, "inconsistent operand constraints in an `asm'");
3758 /* Avoid further trouble with this insn. */
3759 PATTERN (insn) = gen_rtx_USE (VOIDmode, const0_rtx);
3764 else if (goal_alternative_matched[i] < 0
3765 && goal_alternative_matches[i] < 0
3768 /* For each non-matching operand that's a MEM or a pseudo-register
3769 that didn't get a hard register, make an optional reload.
3770 This may get done even if the insn needs no reloads otherwise. */
3772 rtx operand = recog_operand[i];
3774 while (GET_CODE (operand) == SUBREG)
3775 operand = XEXP (operand, 0);
3776 if ((GET_CODE (operand) == MEM
3777 || (GET_CODE (operand) == REG
3778 && REGNO (operand) >= FIRST_PSEUDO_REGISTER))
3779 && (enum reg_class) goal_alternative[i] != NO_REGS
3780 && ! no_input_reloads
3781 /* Optional output reloads don't do anything and we mustn't
3782 make in-out reloads on insns that are not permitted output
3784 && (modified[i] == RELOAD_READ
3785 || (modified[i] == RELOAD_READ_WRITE && ! no_output_reloads)))
3786 operand_reloadnum[i]
3787 = push_reload (modified[i] != RELOAD_WRITE ? recog_operand[i] : 0,
3788 modified[i] != RELOAD_READ ? recog_operand[i] : 0,
3789 (modified[i] != RELOAD_WRITE
3790 ? recog_operand_loc[i] : 0),
3791 (modified[i] != RELOAD_READ
3792 ? recog_operand_loc[i] : 0),
3793 (enum reg_class) goal_alternative[i],
3794 (modified[i] == RELOAD_WRITE
3795 ? VOIDmode : operand_mode[i]),
3796 (modified[i] == RELOAD_READ
3797 ? VOIDmode : operand_mode[i]),
3798 (insn_code_number < 0 ? 0
3799 : insn_operand_strict_low[insn_code_number][i]),
3800 1, i, operand_type[i]);
3802 else if (goal_alternative_matches[i] >= 0
3803 && goal_alternative_win[goal_alternative_matches[i]]
3804 && modified[i] == RELOAD_READ
3805 && modified[goal_alternative_matches[i]] == RELOAD_WRITE
3806 && ! no_input_reloads && ! no_output_reloads
3809 /* Similarly, make an optional reload for a pair of matching
3810 objects that are in MEM or a pseudo that didn't get a hard reg. */
3812 rtx operand = recog_operand[i];
3814 while (GET_CODE (operand) == SUBREG)
3815 operand = XEXP (operand, 0);
3816 if ((GET_CODE (operand) == MEM
3817 || (GET_CODE (operand) == REG
3818 && REGNO (operand) >= FIRST_PSEUDO_REGISTER))
3819 && ((enum reg_class) goal_alternative[goal_alternative_matches[i]]
3821 operand_reloadnum[i] = operand_reloadnum[goal_alternative_matches[i]]
3822 = push_reload (recog_operand[goal_alternative_matches[i]],
3824 recog_operand_loc[goal_alternative_matches[i]],
3825 recog_operand_loc[i],
3826 (enum reg_class) goal_alternative[goal_alternative_matches[i]],
3827 operand_mode[goal_alternative_matches[i]],
3829 0, 1, goal_alternative_matches[i], RELOAD_OTHER);
3832 /* If this insn pattern contains any MATCH_DUP's, make sure that
3833 they will be substituted if the operands they match are substituted.
3834 Also do now any substitutions we already did on the operands.
3836 Don't do this if we aren't making replacements because we might be
3837 propagating things allocated by frame pointer elimination into places
3838 it doesn't expect. */
3840 if (insn_code_number >= 0 && replace)
3841 for (i = insn_n_dups[insn_code_number] - 1; i >= 0; i--)
3843 int opno = recog_dup_num[i];
3844 *recog_dup_loc[i] = *recog_operand_loc[opno];
3845 if (operand_reloadnum[opno] >= 0)
3846 push_replacement (recog_dup_loc[i], operand_reloadnum[opno],
3847 insn_operand_mode[insn_code_number][opno]);
3851 /* This loses because reloading of prior insns can invalidate the equivalence
3852 (or at least find_equiv_reg isn't smart enough to find it any more),
3853 causing this insn to need more reload regs than it needed before.
3854 It may be too late to make the reload regs available.
3855 Now this optimization is done safely in choose_reload_regs. */
3857 /* For each reload of a reg into some other class of reg,
3858 search for an existing equivalent reg (same value now) in the right class.
3859 We can use it as long as we don't need to change its contents. */
3860 for (i = 0; i < n_reloads; i++)
3861 if (reload_reg_rtx[i] == 0
3862 && reload_in[i] != 0
3863 && GET_CODE (reload_in[i]) == REG
3864 && reload_out[i] == 0)
3867 = find_equiv_reg (reload_in[i], insn, reload_reg_class[i], -1,
3868 static_reload_reg_p, 0, reload_inmode[i]);
3869 /* Prevent generation of insn to load the value
3870 because the one we found already has the value. */
3871 if (reload_reg_rtx[i])
3872 reload_in[i] = reload_reg_rtx[i];
3876 /* Perhaps an output reload can be combined with another
3877 to reduce needs by one. */
3878 if (!goal_earlyclobber)
3881 /* If we have a pair of reloads for parts of an address, they are reloading
3882 the same object, the operands themselves were not reloaded, and they
3883 are for two operands that are supposed to match, merge the reloads and
3884 change the type of the surviving reload to RELOAD_FOR_OPERAND_ADDRESS. */
3886 for (i = 0; i < n_reloads; i++)
3890 for (j = i + 1; j < n_reloads; j++)
3891 if ((reload_when_needed[i] == RELOAD_FOR_INPUT_ADDRESS
3892 || reload_when_needed[i] == RELOAD_FOR_OUTPUT_ADDRESS
3893 || reload_when_needed[i] == RELOAD_FOR_INPADDR_ADDRESS
3894 || reload_when_needed[i] == RELOAD_FOR_OUTADDR_ADDRESS)
3895 && (reload_when_needed[j] == RELOAD_FOR_INPUT_ADDRESS
3896 || reload_when_needed[j] == RELOAD_FOR_OUTPUT_ADDRESS
3897 || reload_when_needed[j] == RELOAD_FOR_INPADDR_ADDRESS
3898 || reload_when_needed[j] == RELOAD_FOR_OUTADDR_ADDRESS)
3899 && rtx_equal_p (reload_in[i], reload_in[j])
3900 && (operand_reloadnum[reload_opnum[i]] < 0
3901 || reload_optional[operand_reloadnum[reload_opnum[i]]])
3902 && (operand_reloadnum[reload_opnum[j]] < 0
3903 || reload_optional[operand_reloadnum[reload_opnum[j]]])
3904 && (goal_alternative_matches[reload_opnum[i]] == reload_opnum[j]
3905 || (goal_alternative_matches[reload_opnum[j]]
3906 == reload_opnum[i])))
3908 for (k = 0; k < n_replacements; k++)
3909 if (replacements[k].what == j)
3910 replacements[k].what = i;
3912 if (reload_when_needed[i] == RELOAD_FOR_INPADDR_ADDRESS
3913 || reload_when_needed[i] == RELOAD_FOR_OUTADDR_ADDRESS)
3914 reload_when_needed[i] = RELOAD_FOR_OPADDR_ADDR;
3916 reload_when_needed[i] = RELOAD_FOR_OPERAND_ADDRESS;
3921 /* Scan all the reloads and update their type.
3922 If a reload is for the address of an operand and we didn't reload
3923 that operand, change the type. Similarly, change the operand number
3924 of a reload when two operands match. If a reload is optional, treat it
3925 as though the operand isn't reloaded.
3927 ??? This latter case is somewhat odd because if we do the optional
3928 reload, it means the object is hanging around. Thus we need only
3929 do the address reload if the optional reload was NOT done.
3931 Change secondary reloads to be the address type of their operand, not
3934 If an operand's reload is now RELOAD_OTHER, change any
3935 RELOAD_FOR_INPUT_ADDRESS reloads of that operand to
3936 RELOAD_FOR_OTHER_ADDRESS. */
3938 for (i = 0; i < n_reloads; i++)
3940 if (reload_secondary_p[i]
3941 && reload_when_needed[i] == operand_type[reload_opnum[i]])
3942 reload_when_needed[i] = address_type[reload_opnum[i]];
3944 if ((reload_when_needed[i] == RELOAD_FOR_INPUT_ADDRESS
3945 || reload_when_needed[i] == RELOAD_FOR_OUTPUT_ADDRESS
3946 || reload_when_needed[i] == RELOAD_FOR_INPADDR_ADDRESS
3947 || reload_when_needed[i] == RELOAD_FOR_OUTADDR_ADDRESS)
3948 && (operand_reloadnum[reload_opnum[i]] < 0
3949 || reload_optional[operand_reloadnum[reload_opnum[i]]]))
3951 /* If we have a secondary reload to go along with this reload,
3952 change its type to RELOAD_FOR_OPADDR_ADDR. */
3954 if ((reload_when_needed[i] == RELOAD_FOR_INPUT_ADDRESS
3955 || reload_when_needed[i] == RELOAD_FOR_INPADDR_ADDRESS)
3956 && reload_secondary_in_reload[i] != -1)
3958 int secondary_in_reload = reload_secondary_in_reload[i];
3960 reload_when_needed[secondary_in_reload]
3961 = RELOAD_FOR_OPADDR_ADDR;
3963 /* If there's a tertiary reload we have to change it also. */
3964 if (secondary_in_reload > 0
3965 && reload_secondary_in_reload[secondary_in_reload] != -1)
3966 reload_when_needed[reload_secondary_in_reload[secondary_in_reload]]
3967 = RELOAD_FOR_OPADDR_ADDR;
3970 if ((reload_when_needed[i] == RELOAD_FOR_OUTPUT_ADDRESS
3971 || reload_when_needed[i] == RELOAD_FOR_OUTADDR_ADDRESS)
3972 && reload_secondary_out_reload[i] != -1)
3974 int secondary_out_reload = reload_secondary_out_reload[i];
3976 reload_when_needed[secondary_out_reload]
3977 = RELOAD_FOR_OPADDR_ADDR;
3979 /* If there's a tertiary reload we have to change it also. */
3980 if (secondary_out_reload
3981 && reload_secondary_out_reload[secondary_out_reload] != -1)
3982 reload_when_needed[reload_secondary_out_reload[secondary_out_reload]]
3983 = RELOAD_FOR_OPADDR_ADDR;
3986 reload_when_needed[i] = RELOAD_FOR_OPERAND_ADDRESS;
3989 if ((reload_when_needed[i] == RELOAD_FOR_INPUT_ADDRESS
3990 || reload_when_needed[i] == RELOAD_FOR_INPADDR_ADDRESS)
3991 && operand_reloadnum[reload_opnum[i]] >= 0
3992 && (reload_when_needed[operand_reloadnum[reload_opnum[i]]]
3994 reload_when_needed[i] = RELOAD_FOR_OTHER_ADDRESS;
3996 if (goal_alternative_matches[reload_opnum[i]] >= 0)
3997 reload_opnum[i] = goal_alternative_matches[reload_opnum[i]];
4000 /* Scan all the reloads, and check for RELOAD_FOR_OPERAND_ADDRESS reloads.
4001 If we have more than one, then convert all RELOAD_FOR_OPADDR_ADDR
4002 reloads to RELOAD_FOR_OPERAND_ADDRESS reloads.
4004 choose_reload_regs assumes that RELOAD_FOR_OPADDR_ADDR reloads never
4005 conflict with RELOAD_FOR_OPERAND_ADDRESS reloads. This is true for a
4006 single pair of RELOAD_FOR_OPADDR_ADDR/RELOAD_FOR_OPERAND_ADDRESS reloads.
4007 However, if there is more than one RELOAD_FOR_OPERAND_ADDRESS reload,
4008 then a RELOAD_FOR_OPADDR_ADDR reload conflicts with all
4009 RELOAD_FOR_OPERAND_ADDRESS reloads other than the one that uses it.
4010 This is complicated by the fact that a single operand can have more
4011 than one RELOAD_FOR_OPERAND_ADDRESS reload. It is very difficult to fix
4012 choose_reload_regs without affecting code quality, and cases that
4013 actually fail are extremely rare, so it turns out to be better to fix
4014 the problem here by not generating cases that choose_reload_regs will
4016 /* There is a similar problem with RELAOD_FOR_INPUT_ADDRESS /
4017 RELOAD_FOR_OUTPUT_ADDRESS when there is more than one of a kind for
4019 We can reduce the register pressure by exploiting that a
4020 RELOAD_FOR_X_ADDR_ADDR that precedes all RELOAD_FOR_X_ADDRESS reloads
4021 does not conflict with any of them. */
4023 int first_op_addr_num = -2;
4024 int first_inpaddr_num[MAX_RECOG_OPERANDS];
4025 int first_outpaddr_num[MAX_RECOG_OPERANDS];
4027 /* We use last_op_addr_reload and the contents of the above arrays
4028 first as flags - -2 means no instance encountered, -1 means exactly
4029 one instance encountered.
4030 If more than one instance has been encountered, we store the reload
4031 number of the first reload of the kind in question; reload numbers
4032 are known to be non-negative. */
4033 for (i = 0; i < noperands; i++)
4034 first_inpaddr_num[i] = first_outpaddr_num[i] = -2;
4035 for (i = n_reloads - 1; i >= 0; i--)
4037 switch (reload_when_needed[i])
4039 case RELOAD_FOR_OPERAND_ADDRESS:
4040 if (! ++first_op_addr_num)
4042 first_op_addr_num= i;
4046 case RELOAD_FOR_INPUT_ADDRESS:
4047 if (! ++first_inpaddr_num[reload_opnum[i]])
4049 first_inpaddr_num[reload_opnum[i]] = i;
4053 case RELOAD_FOR_OUTPUT_ADDRESS:
4054 if (! ++first_outpaddr_num[reload_opnum[i]])
4056 first_outpaddr_num[reload_opnum[i]] = i;
4067 for (i = 0; i < n_reloads; i++)
4069 int first_num, type;
4071 switch (reload_when_needed[i])
4073 case RELOAD_FOR_OPADDR_ADDR:
4074 first_num = first_op_addr_num;
4075 type = RELOAD_FOR_OPERAND_ADDRESS;
4077 case RELOAD_FOR_INPADDR_ADDRESS:
4078 first_num = first_inpaddr_num[reload_opnum[i]];
4079 type = RELOAD_FOR_INPUT_ADDRESS;
4081 case RELOAD_FOR_OUTADDR_ADDRESS:
4082 first_num = first_outpaddr_num[reload_opnum[i]];
4083 type = RELOAD_FOR_OUTPUT_ADDRESS;
4089 reload_when_needed[i] = type;
4094 /* See if we have any reloads that are now allowed to be merged
4095 because we've changed when the reload is needed to
4096 RELOAD_FOR_OPERAND_ADDRESS or RELOAD_FOR_OTHER_ADDRESS. Only
4097 check for the most common cases. */
4099 for (i = 0; i < n_reloads; i++)
4100 if (reload_in[i] != 0 && reload_out[i] == 0
4101 && (reload_when_needed[i] == RELOAD_FOR_OPERAND_ADDRESS
4102 || reload_when_needed[i] == RELOAD_FOR_OPADDR_ADDR
4103 || reload_when_needed[i] == RELOAD_FOR_OTHER_ADDRESS))
4104 for (j = 0; j < n_reloads; j++)
4105 if (i != j && reload_in[j] != 0 && reload_out[j] == 0
4106 && reload_when_needed[j] == reload_when_needed[i]
4107 && MATCHES (reload_in[i], reload_in[j])
4108 && reload_reg_class[i] == reload_reg_class[j]
4109 && !reload_nocombine[i] && !reload_nocombine[j]
4110 && reload_reg_rtx[i] == reload_reg_rtx[j])
4112 reload_opnum[i] = MIN (reload_opnum[i], reload_opnum[j]);
4113 transfer_replacements (i, j);
4117 /* Set which reloads must use registers not used in any group. Start
4118 with those that conflict with a group and then include ones that
4119 conflict with ones that are already known to conflict with a group. */
4122 for (i = 0; i < n_reloads; i++)
4124 enum machine_mode mode = reload_inmode[i];
4125 enum reg_class class = reload_reg_class[i];
4128 if (GET_MODE_SIZE (reload_outmode[i]) > GET_MODE_SIZE (mode))
4129 mode = reload_outmode[i];
4130 size = CLASS_MAX_NREGS (class, mode);
4133 for (j = 0; j < n_reloads; j++)
4134 if ((CLASS_MAX_NREGS (reload_reg_class[j],
4135 (GET_MODE_SIZE (reload_outmode[j])
4136 > GET_MODE_SIZE (reload_inmode[j]))
4137 ? reload_outmode[j] : reload_inmode[j])
4139 && !reload_optional[j]
4140 && (reload_in[j] != 0 || reload_out[j] != 0
4141 || reload_secondary_p[j])
4142 && reloads_conflict (i, j)
4143 && reg_classes_intersect_p (class, reload_reg_class[j]))
4145 reload_nongroup[i] = 1;
4155 for (i = 0; i < n_reloads; i++)
4157 enum machine_mode mode = reload_inmode[i];
4158 enum reg_class class = reload_reg_class[i];
4161 if (GET_MODE_SIZE (reload_outmode[i]) > GET_MODE_SIZE (mode))
4162 mode = reload_outmode[i];
4163 size = CLASS_MAX_NREGS (class, mode);
4165 if (! reload_nongroup[i] && size == 1)
4166 for (j = 0; j < n_reloads; j++)
4167 if (reload_nongroup[j]
4168 && reloads_conflict (i, j)
4169 && reg_classes_intersect_p (class, reload_reg_class[j]))
4171 reload_nongroup[i] = 1;
4178 #else /* no REGISTER_CONSTRAINTS */
4180 int insn_code_number;
4181 int goal_earlyclobber = 0; /* Always 0, to make combine_reloads happen. */
4183 rtx body = PATTERN (insn);
4187 n_earlyclobbers = 0;
4188 replace_reloads = replace;
4191 /* Find what kind of insn this is. NOPERANDS gets number of operands.
4192 Store the operand values in RECOG_OPERAND and the locations
4193 of the words in the insn that point to them in RECOG_OPERAND_LOC.
4194 Return if the insn needs no reload processing. */
4196 switch (GET_CODE (body))
4207 noperands = asm_noperands (body);
4210 /* This insn is an `asm' with operands.
4211 First, find out how many operands, and allocate space. */
4213 insn_code_number = -1;
4214 /* ??? This is a bug! ???
4215 Give up and delete this insn if it has too many operands. */
4216 if (noperands > MAX_RECOG_OPERANDS)
4219 /* Now get the operand values out of the insn. */
4221 decode_asm_operands (body, recog_operand, recog_operand_loc,
4222 NULL_PTR, NULL_PTR);
4227 /* Ordinary insn: recognize it, allocate space for operands and
4228 constraints, and get them out via insn_extract. */
4230 insn_code_number = recog_memoized (insn);
4231 noperands = insn_n_operands[insn_code_number];
4232 insn_extract (insn);
4238 for (i = 0; i < noperands; i++)
4240 register RTX_CODE code = GET_CODE (recog_operand[i]);
4241 int is_set_dest = GET_CODE (body) == SET && (i == 0);
4243 if (insn_code_number >= 0)
4244 if (insn_operand_address_p[insn_code_number][i])
4245 find_reloads_address (VOIDmode, NULL_PTR,
4246 recog_operand[i], recog_operand_loc[i],
4247 i, RELOAD_FOR_INPUT, ind_levels, insn);
4249 /* In these cases, we can't tell if the operand is an input
4250 or an output, so be conservative. In practice it won't be
4254 find_reloads_address (GET_MODE (recog_operand[i]),
4255 recog_operand_loc[i],
4256 XEXP (recog_operand[i], 0),
4257 &XEXP (recog_operand[i], 0),
4258 i, RELOAD_OTHER, ind_levels, insn);
4260 recog_operand[i] = *recog_operand_loc[i]
4261 = find_reloads_toplev (recog_operand[i], i, RELOAD_OTHER,
4262 ind_levels, is_set_dest);
4265 register int regno = REGNO (recog_operand[i]);
4266 if (reg_equiv_constant[regno] != 0 && !is_set_dest)
4267 recog_operand[i] = *recog_operand_loc[i]
4268 = reg_equiv_constant[regno];
4269 #if 0 /* This might screw code in reload1.c to delete prior output-reload
4270 that feeds this insn. */
4271 if (reg_equiv_mem[regno] != 0)
4272 recog_operand[i] = *recog_operand_loc[i]
4273 = reg_equiv_mem[regno];
4278 /* Perhaps an output reload can be combined with another
4279 to reduce needs by one. */
4280 if (!goal_earlyclobber)
4282 #endif /* no REGISTER_CONSTRAINTS */
4285 /* Return 1 if alternative number ALTNUM in constraint-string CONSTRAINT
4286 accepts a memory operand with constant address. */
4289 alternative_allows_memconst (constraint, altnum)
4294 /* Skip alternatives before the one requested. */
4297 while (*constraint++ != ',');
4300 /* Scan the requested alternative for 'm' or 'o'.
4301 If one of them is present, this alternative accepts memory constants. */
4302 while ((c = *constraint++) && c != ',' && c != '#')
4303 if (c == 'm' || c == 'o')
4308 /* Scan X for memory references and scan the addresses for reloading.
4309 Also checks for references to "constant" regs that we want to eliminate
4310 and replaces them with the values they stand for.
4311 We may alter X destructively if it contains a reference to such.
4312 If X is just a constant reg, we return the equivalent value
4315 IND_LEVELS says how many levels of indirect addressing this machine
4318 OPNUM and TYPE identify the purpose of the reload.
4320 IS_SET_DEST is true if X is the destination of a SET, which is not
4321 appropriate to be replaced by a constant. */
4324 find_reloads_toplev (x, opnum, type, ind_levels, is_set_dest)
4327 enum reload_type type;
4331 register RTX_CODE code = GET_CODE (x);
4333 register char *fmt = GET_RTX_FORMAT (code);
4338 /* This code is duplicated for speed in find_reloads. */
4339 register int regno = REGNO (x);
4340 if (reg_equiv_constant[regno] != 0 && !is_set_dest)
4341 x = reg_equiv_constant[regno];
4343 /* This creates (subreg (mem...)) which would cause an unnecessary
4344 reload of the mem. */
4345 else if (reg_equiv_mem[regno] != 0)
4346 x = reg_equiv_mem[regno];
4348 else if (reg_equiv_address[regno] != 0)
4350 /* If reg_equiv_address varies, it may be shared, so copy it. */
4351 /* We must rerun eliminate_regs, in case the elimination
4352 offsets have changed. */
4353 rtx addr = XEXP (eliminate_regs (reg_equiv_memory_loc[regno], 0,
4357 if (rtx_varies_p (addr))
4358 addr = copy_rtx (addr);
4360 x = gen_rtx_MEM (GET_MODE (x), addr);
4361 RTX_UNCHANGING_P (x) = RTX_UNCHANGING_P (regno_reg_rtx[regno]);
4362 find_reloads_address (GET_MODE (x), NULL_PTR,
4364 &XEXP (x, 0), opnum, type, ind_levels, 0);
4371 find_reloads_address (GET_MODE (x), &tem, XEXP (x, 0), &XEXP (x, 0),
4372 opnum, type, ind_levels, 0);
4376 if (code == SUBREG && GET_CODE (SUBREG_REG (x)) == REG)
4378 /* Check for SUBREG containing a REG that's equivalent to a constant.
4379 If the constant has a known value, truncate it right now.
4380 Similarly if we are extracting a single-word of a multi-word
4381 constant. If the constant is symbolic, allow it to be substituted
4382 normally. push_reload will strip the subreg later. If the
4383 constant is VOIDmode, abort because we will lose the mode of
4384 the register (this should never happen because one of the cases
4385 above should handle it). */
4387 register int regno = REGNO (SUBREG_REG (x));
4390 if (subreg_lowpart_p (x)
4391 && regno >= FIRST_PSEUDO_REGISTER && reg_renumber[regno] < 0
4392 && reg_equiv_constant[regno] != 0
4393 && (tem = gen_lowpart_common (GET_MODE (x),
4394 reg_equiv_constant[regno])) != 0)
4397 if (GET_MODE_BITSIZE (GET_MODE (x)) == BITS_PER_WORD
4398 && regno >= FIRST_PSEUDO_REGISTER && reg_renumber[regno] < 0
4399 && reg_equiv_constant[regno] != 0
4400 && (tem = operand_subword (reg_equiv_constant[regno],
4402 GET_MODE (SUBREG_REG (x)))) != 0)
4404 /* TEM is now a word sized constant for the bits from X that
4405 we wanted. However, TEM may be the wrong representation.
4407 Use gen_lowpart_common to convert a CONST_INT into a
4408 CONST_DOUBLE and vice versa as needed according to by the mode
4410 tem = gen_lowpart_common (GET_MODE (x), tem);
4416 /* If the SUBREG is wider than a word, the above test will fail.
4417 For example, we might have a SImode SUBREG of a DImode SUBREG_REG
4418 for a 16 bit target, or a DImode SUBREG of a TImode SUBREG_REG for
4419 a 32 bit target. We still can - and have to - handle this
4420 for non-paradoxical subregs of CONST_INTs. */
4421 if (regno >= FIRST_PSEUDO_REGISTER && reg_renumber[regno] < 0
4422 && reg_equiv_constant[regno] != 0
4423 && GET_CODE (reg_equiv_constant[regno]) == CONST_INT
4424 && (GET_MODE_SIZE (GET_MODE (x))
4425 < GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))))
4427 int shift = SUBREG_WORD (x) * BITS_PER_WORD;
4428 if (WORDS_BIG_ENDIAN)
4429 shift = (GET_MODE_BITSIZE (GET_MODE (SUBREG_REG (x)))
4430 - GET_MODE_BITSIZE (GET_MODE (x))
4432 /* Here we use the knowledge that CONST_INTs have a
4433 HOST_WIDE_INT field. */
4434 if (shift >= HOST_BITS_PER_WIDE_INT)
4435 shift = HOST_BITS_PER_WIDE_INT - 1;
4436 return GEN_INT (INTVAL (reg_equiv_constant[regno]) >> shift);
4439 if (regno >= FIRST_PSEUDO_REGISTER && reg_renumber[regno] < 0
4440 && reg_equiv_constant[regno] != 0
4441 && GET_MODE (reg_equiv_constant[regno]) == VOIDmode)
4444 /* If the subreg contains a reg that will be converted to a mem,
4445 convert the subreg to a narrower memref now.
4446 Otherwise, we would get (subreg (mem ...) ...),
4447 which would force reload of the mem.
4449 We also need to do this if there is an equivalent MEM that is
4450 not offsettable. In that case, alter_subreg would produce an
4451 invalid address on big-endian machines.
4453 For machines that extend byte loads, we must not reload using
4454 a wider mode if we have a paradoxical SUBREG. find_reloads will
4455 force a reload in that case. So we should not do anything here. */
4457 else if (regno >= FIRST_PSEUDO_REGISTER
4458 #ifdef LOAD_EXTEND_OP
4459 && (GET_MODE_SIZE (GET_MODE (x))
4460 <= GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))))
4462 && (reg_equiv_address[regno] != 0
4463 || (reg_equiv_mem[regno] != 0
4464 && (! strict_memory_address_p (GET_MODE (x),
4465 XEXP (reg_equiv_mem[regno], 0))
4466 || ! offsettable_memref_p (reg_equiv_mem[regno])))))
4468 int offset = SUBREG_WORD (x) * UNITS_PER_WORD;
4469 /* We must rerun eliminate_regs, in case the elimination
4470 offsets have changed. */
4471 rtx addr = XEXP (eliminate_regs (reg_equiv_memory_loc[regno], 0,
4474 if (BYTES_BIG_ENDIAN)
4477 size = GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)));
4478 offset += MIN (size, UNITS_PER_WORD);
4479 size = GET_MODE_SIZE (GET_MODE (x));
4480 offset -= MIN (size, UNITS_PER_WORD);
4482 addr = plus_constant (addr, offset);
4483 x = gen_rtx_MEM (GET_MODE (x), addr);
4484 RTX_UNCHANGING_P (x) = RTX_UNCHANGING_P (regno_reg_rtx[regno]);
4485 find_reloads_address (GET_MODE (x), NULL_PTR,
4487 &XEXP (x, 0), opnum, type, ind_levels, 0);
4492 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
4495 XEXP (x, i) = find_reloads_toplev (XEXP (x, i), opnum, type,
4496 ind_levels, is_set_dest);
4501 /* Return a mem ref for the memory equivalent of reg REGNO.
4502 This mem ref is not shared with anything. */
4505 make_memloc (ad, regno)
4512 /* We must rerun eliminate_regs, in case the elimination
4513 offsets have changed. */
4514 rtx tem = XEXP (eliminate_regs (reg_equiv_memory_loc[regno], 0, NULL_RTX), 0);
4516 #if 0 /* We cannot safely reuse a memloc made here;
4517 if the pseudo appears twice, and its mem needs a reload,
4518 it gets two separate reloads assigned, but it only
4519 gets substituted with the second of them;
4520 then it can get used before that reload reg gets loaded up. */
4521 for (i = 0; i < n_memlocs; i++)
4522 if (rtx_equal_p (tem, XEXP (memlocs[i], 0)))
4526 /* If TEM might contain a pseudo, we must copy it to avoid
4527 modifying it when we do the substitution for the reload. */
4528 if (rtx_varies_p (tem))
4529 tem = copy_rtx (tem);
4531 tem = gen_rtx_MEM (GET_MODE (ad), tem);
4532 RTX_UNCHANGING_P (tem) = RTX_UNCHANGING_P (regno_reg_rtx[regno]);
4533 memlocs[n_memlocs++] = tem;
4537 /* Record all reloads needed for handling memory address AD
4538 which appears in *LOC in a memory reference to mode MODE
4539 which itself is found in location *MEMREFLOC.
4540 Note that we take shortcuts assuming that no multi-reg machine mode
4541 occurs as part of an address.
4543 OPNUM and TYPE specify the purpose of this reload.
4545 IND_LEVELS says how many levels of indirect addressing this machine
4548 INSN, if nonzero, is the insn in which we do the reload. It is used
4549 to determine if we may generate output reloads.
4551 Value is nonzero if this address is reloaded or replaced as a whole.
4552 This is interesting to the caller if the address is an autoincrement.
4554 Note that there is no verification that the address will be valid after
4555 this routine does its work. Instead, we rely on the fact that the address
4556 was valid when reload started. So we need only undo things that reload
4557 could have broken. These are wrong register types, pseudos not allocated
4558 to a hard register, and frame pointer elimination. */
4561 find_reloads_address (mode, memrefloc, ad, loc, opnum, type, ind_levels, insn)
4562 enum machine_mode mode;
4567 enum reload_type type;
4574 /* If the address is a register, see if it is a legitimate address and
4575 reload if not. We first handle the cases where we need not reload
4576 or where we must reload in a non-standard way. */
4578 if (GET_CODE (ad) == REG)
4582 if (reg_equiv_constant[regno] != 0
4583 && strict_memory_address_p (mode, reg_equiv_constant[regno]))
4585 *loc = ad = reg_equiv_constant[regno];
4589 else if (reg_equiv_address[regno] != 0)
4591 tem = make_memloc (ad, regno);
4592 find_reloads_address (GET_MODE (tem), NULL_PTR, XEXP (tem, 0),
4593 &XEXP (tem, 0), opnum, ADDR_TYPE (type),
4595 push_reload (tem, NULL_RTX, loc, NULL_PTR,
4596 reload_address_base_reg_class,
4597 GET_MODE (ad), VOIDmode, 0, 0,
4602 /* We can avoid a reload if the register's equivalent memory expression
4603 is valid as an indirect memory address.
4604 But not all addresses are valid in a mem used as an indirect address:
4605 only reg or reg+constant. */
4607 else if (reg_equiv_mem[regno] != 0 && ind_levels > 0
4608 && strict_memory_address_p (mode, reg_equiv_mem[regno])
4609 && (GET_CODE (XEXP (reg_equiv_mem[regno], 0)) == REG
4610 || (GET_CODE (XEXP (reg_equiv_mem[regno], 0)) == PLUS
4611 && GET_CODE (XEXP (XEXP (reg_equiv_mem[regno], 0), 0)) == REG
4612 && CONSTANT_P (XEXP (XEXP (reg_equiv_mem[regno], 0), 1)))))
4615 /* The only remaining case where we can avoid a reload is if this is a
4616 hard register that is valid as a base register and which is not the
4617 subject of a CLOBBER in this insn. */
4619 else if (regno < FIRST_PSEUDO_REGISTER
4620 && REGNO_MODE_OK_FOR_BASE_P (regno, mode)
4621 && ! regno_clobbered_p (regno, this_insn))
4624 /* If we do not have one of the cases above, we must do the reload. */
4625 push_reload (ad, NULL_RTX, loc, NULL_PTR, reload_address_base_reg_class,
4626 GET_MODE (ad), VOIDmode, 0, 0, opnum, type);
4630 if (strict_memory_address_p (mode, ad))
4632 /* The address appears valid, so reloads are not needed.
4633 But the address may contain an eliminable register.
4634 This can happen because a machine with indirect addressing
4635 may consider a pseudo register by itself a valid address even when
4636 it has failed to get a hard reg.
4637 So do a tree-walk to find and eliminate all such regs. */
4639 /* But first quickly dispose of a common case. */
4640 if (GET_CODE (ad) == PLUS
4641 && GET_CODE (XEXP (ad, 1)) == CONST_INT
4642 && GET_CODE (XEXP (ad, 0)) == REG
4643 && reg_equiv_constant[REGNO (XEXP (ad, 0))] == 0)
4646 subst_reg_equivs_changed = 0;
4647 *loc = subst_reg_equivs (ad);
4649 if (! subst_reg_equivs_changed)
4652 /* Check result for validity after substitution. */
4653 if (strict_memory_address_p (mode, ad))
4657 #ifdef LEGITIMIZE_RELOAD_ADDRESS
4662 LEGITIMIZE_RELOAD_ADDRESS (ad, GET_MODE (*memrefloc), opnum, type,
4667 *memrefloc = copy_rtx (*memrefloc);
4668 XEXP (*memrefloc, 0) = ad;
4669 move_replacements (&ad, &XEXP (*memrefloc, 0));
4675 /* The address is not valid. We have to figure out why. One possibility
4676 is that it is itself a MEM. This can happen when the frame pointer is
4677 being eliminated, a pseudo is not allocated to a hard register, and the
4678 offset between the frame and stack pointers is not its initial value.
4679 In that case the pseudo will have been replaced by a MEM referring to
4680 the stack pointer. */
4681 if (GET_CODE (ad) == MEM)
4683 /* First ensure that the address in this MEM is valid. Then, unless
4684 indirect addresses are valid, reload the MEM into a register. */
4686 find_reloads_address (GET_MODE (ad), &tem, XEXP (ad, 0), &XEXP (ad, 0),
4687 opnum, ADDR_TYPE (type),
4688 ind_levels == 0 ? 0 : ind_levels - 1, insn);
4690 /* If tem was changed, then we must create a new memory reference to
4691 hold it and store it back into memrefloc. */
4692 if (tem != ad && memrefloc)
4694 *memrefloc = copy_rtx (*memrefloc);
4695 copy_replacements (tem, XEXP (*memrefloc, 0));
4696 loc = &XEXP (*memrefloc, 0);
4699 /* Check similar cases as for indirect addresses as above except
4700 that we can allow pseudos and a MEM since they should have been
4701 taken care of above. */
4704 || (GET_CODE (XEXP (tem, 0)) == SYMBOL_REF && ! indirect_symref_ok)
4705 || GET_CODE (XEXP (tem, 0)) == MEM
4706 || ! (GET_CODE (XEXP (tem, 0)) == REG
4707 || (GET_CODE (XEXP (tem, 0)) == PLUS
4708 && GET_CODE (XEXP (XEXP (tem, 0), 0)) == REG
4709 && GET_CODE (XEXP (XEXP (tem, 0), 1)) == CONST_INT)))
4711 /* Must use TEM here, not AD, since it is the one that will
4712 have any subexpressions reloaded, if needed. */
4713 push_reload (tem, NULL_RTX, loc, NULL_PTR,
4714 reload_address_base_reg_class, GET_MODE (tem),
4723 /* If we have address of a stack slot but it's not valid because the
4724 displacement is too large, compute the sum in a register.
4725 Handle all base registers here, not just fp/ap/sp, because on some
4726 targets (namely SH) we can also get too large displacements from
4727 big-endian corrections. */
4728 else if (GET_CODE (ad) == PLUS
4729 && GET_CODE (XEXP (ad, 0)) == REG
4730 && REGNO (XEXP (ad, 0)) < FIRST_PSEUDO_REGISTER
4731 && REG_MODE_OK_FOR_BASE_P (XEXP (ad, 0), mode)
4732 && GET_CODE (XEXP (ad, 1)) == CONST_INT)
4734 /* Unshare the MEM rtx so we can safely alter it. */
4737 *memrefloc = copy_rtx (*memrefloc);
4738 loc = &XEXP (*memrefloc, 0);
4740 if (double_reg_address_ok)
4742 /* Unshare the sum as well. */
4743 *loc = ad = copy_rtx (ad);
4744 /* Reload the displacement into an index reg.
4745 We assume the frame pointer or arg pointer is a base reg. */
4746 find_reloads_address_part (XEXP (ad, 1), &XEXP (ad, 1),
4747 reload_address_index_reg_class,
4748 GET_MODE (ad), opnum, type, ind_levels);
4752 /* If the sum of two regs is not necessarily valid,
4753 reload the sum into a base reg.
4754 That will at least work. */
4755 find_reloads_address_part (ad, loc, reload_address_base_reg_class,
4756 Pmode, opnum, type, ind_levels);
4761 /* If we have an indexed stack slot, there are three possible reasons why
4762 it might be invalid: The index might need to be reloaded, the address
4763 might have been made by frame pointer elimination and hence have a
4764 constant out of range, or both reasons might apply.
4766 We can easily check for an index needing reload, but even if that is the
4767 case, we might also have an invalid constant. To avoid making the
4768 conservative assumption and requiring two reloads, we see if this address
4769 is valid when not interpreted strictly. If it is, the only problem is
4770 that the index needs a reload and find_reloads_address_1 will take care
4773 There is still a case when we might generate an extra reload,
4774 however. In certain cases eliminate_regs will return a MEM for a REG
4775 (see the code there for details). In those cases, memory_address_p
4776 applied to our address will return 0 so we will think that our offset
4777 must be too large. But it might indeed be valid and the only problem
4778 is that a MEM is present where a REG should be. This case should be
4779 very rare and there doesn't seem to be any way to avoid it.
4781 If we decide to do something here, it must be that
4782 `double_reg_address_ok' is true and that this address rtl was made by
4783 eliminate_regs. We generate a reload of the fp/sp/ap + constant and
4784 rework the sum so that the reload register will be added to the index.
4785 This is safe because we know the address isn't shared.
4787 We check for fp/ap/sp as both the first and second operand of the
4790 else if (GET_CODE (ad) == PLUS && GET_CODE (XEXP (ad, 1)) == CONST_INT
4791 && GET_CODE (XEXP (ad, 0)) == PLUS
4792 && (XEXP (XEXP (ad, 0), 0) == frame_pointer_rtx
4793 #if FRAME_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
4794 || XEXP (XEXP (ad, 0), 0) == hard_frame_pointer_rtx
4796 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
4797 || XEXP (XEXP (ad, 0), 0) == arg_pointer_rtx
4799 || XEXP (XEXP (ad, 0), 0) == stack_pointer_rtx)
4800 && ! memory_address_p (mode, ad))
4802 *loc = ad = gen_rtx_PLUS (GET_MODE (ad),
4803 plus_constant (XEXP (XEXP (ad, 0), 0),
4804 INTVAL (XEXP (ad, 1))),
4805 XEXP (XEXP (ad, 0), 1));
4806 find_reloads_address_part (XEXP (ad, 0), &XEXP (ad, 0),
4807 reload_address_base_reg_class,
4808 GET_MODE (ad), opnum, type, ind_levels);
4809 find_reloads_address_1 (mode, XEXP (ad, 1), 1, &XEXP (ad, 1), opnum,
4815 else if (GET_CODE (ad) == PLUS && GET_CODE (XEXP (ad, 1)) == CONST_INT
4816 && GET_CODE (XEXP (ad, 0)) == PLUS
4817 && (XEXP (XEXP (ad, 0), 1) == frame_pointer_rtx
4818 #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
4819 || XEXP (XEXP (ad, 0), 1) == hard_frame_pointer_rtx
4821 #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
4822 || XEXP (XEXP (ad, 0), 1) == arg_pointer_rtx
4824 || XEXP (XEXP (ad, 0), 1) == stack_pointer_rtx)
4825 && ! memory_address_p (mode, ad))
4827 *loc = ad = gen_rtx_PLUS (GET_MODE (ad),
4828 XEXP (XEXP (ad, 0), 0),
4829 plus_constant (XEXP (XEXP (ad, 0), 1),
4830 INTVAL (XEXP (ad, 1))));
4831 find_reloads_address_part (XEXP (ad, 1), &XEXP (ad, 1),
4832 reload_address_base_reg_class,
4833 GET_MODE (ad), opnum, type, ind_levels);
4834 find_reloads_address_1 (mode, XEXP (ad, 0), 1, &XEXP (ad, 0), opnum,
4840 /* See if address becomes valid when an eliminable register
4841 in a sum is replaced. */
4844 if (GET_CODE (ad) == PLUS)
4845 tem = subst_indexed_address (ad);
4846 if (tem != ad && strict_memory_address_p (mode, tem))
4848 /* Ok, we win that way. Replace any additional eliminable
4851 subst_reg_equivs_changed = 0;
4852 tem = subst_reg_equivs (tem);
4854 /* Make sure that didn't make the address invalid again. */
4856 if (! subst_reg_equivs_changed || strict_memory_address_p (mode, tem))
4863 /* If constants aren't valid addresses, reload the constant address
4865 if (CONSTANT_P (ad) && ! strict_memory_address_p (mode, ad))
4867 /* If AD is in address in the constant pool, the MEM rtx may be shared.
4868 Unshare it so we can safely alter it. */
4869 if (memrefloc && GET_CODE (ad) == SYMBOL_REF
4870 && CONSTANT_POOL_ADDRESS_P (ad))
4872 *memrefloc = copy_rtx (*memrefloc);
4873 loc = &XEXP (*memrefloc, 0);
4876 find_reloads_address_part (ad, loc, reload_address_base_reg_class,
4882 return find_reloads_address_1 (mode, ad, 0, loc, opnum, type, ind_levels,
4886 /* Find all pseudo regs appearing in AD
4887 that are eliminable in favor of equivalent values
4888 and do not have hard regs; replace them by their equivalents. */
4891 subst_reg_equivs (ad)
4894 register RTX_CODE code = GET_CODE (ad);
4912 register int regno = REGNO (ad);
4914 if (reg_equiv_constant[regno] != 0)
4916 subst_reg_equivs_changed = 1;
4917 return reg_equiv_constant[regno];
4923 /* Quickly dispose of a common case. */
4924 if (XEXP (ad, 0) == frame_pointer_rtx
4925 && GET_CODE (XEXP (ad, 1)) == CONST_INT)
4933 fmt = GET_RTX_FORMAT (code);
4934 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
4936 XEXP (ad, i) = subst_reg_equivs (XEXP (ad, i));
4940 /* Compute the sum of X and Y, making canonicalizations assumed in an
4941 address, namely: sum constant integers, surround the sum of two
4942 constants with a CONST, put the constant as the second operand, and
4943 group the constant on the outermost sum.
4945 This routine assumes both inputs are already in canonical form. */
4952 enum machine_mode mode = GET_MODE (x);
4954 if (mode == VOIDmode)
4955 mode = GET_MODE (y);
4957 if (mode == VOIDmode)
4960 if (GET_CODE (x) == CONST_INT)
4961 return plus_constant (y, INTVAL (x));
4962 else if (GET_CODE (y) == CONST_INT)
4963 return plus_constant (x, INTVAL (y));
4964 else if (CONSTANT_P (x))
4965 tem = x, x = y, y = tem;
4967 if (GET_CODE (x) == PLUS && CONSTANT_P (XEXP (x, 1)))
4968 return form_sum (XEXP (x, 0), form_sum (XEXP (x, 1), y));
4970 /* Note that if the operands of Y are specified in the opposite
4971 order in the recursive calls below, infinite recursion will occur. */
4972 if (GET_CODE (y) == PLUS && CONSTANT_P (XEXP (y, 1)))
4973 return form_sum (form_sum (x, XEXP (y, 0)), XEXP (y, 1));
4975 /* If both constant, encapsulate sum. Otherwise, just form sum. A
4976 constant will have been placed second. */
4977 if (CONSTANT_P (x) && CONSTANT_P (y))
4979 if (GET_CODE (x) == CONST)
4981 if (GET_CODE (y) == CONST)
4984 return gen_rtx_CONST (VOIDmode, gen_rtx_PLUS (mode, x, y));
4987 return gen_rtx_PLUS (mode, x, y);
4990 /* If ADDR is a sum containing a pseudo register that should be
4991 replaced with a constant (from reg_equiv_constant),
4992 return the result of doing so, and also apply the associative
4993 law so that the result is more likely to be a valid address.
4994 (But it is not guaranteed to be one.)
4996 Note that at most one register is replaced, even if more are
4997 replaceable. Also, we try to put the result into a canonical form
4998 so it is more likely to be a valid address.
5000 In all other cases, return ADDR. */
5003 subst_indexed_address (addr)
5006 rtx op0 = 0, op1 = 0, op2 = 0;
5010 if (GET_CODE (addr) == PLUS)
5012 /* Try to find a register to replace. */
5013 op0 = XEXP (addr, 0), op1 = XEXP (addr, 1), op2 = 0;
5014 if (GET_CODE (op0) == REG
5015 && (regno = REGNO (op0)) >= FIRST_PSEUDO_REGISTER
5016 && reg_renumber[regno] < 0
5017 && reg_equiv_constant[regno] != 0)
5018 op0 = reg_equiv_constant[regno];
5019 else if (GET_CODE (op1) == REG
5020 && (regno = REGNO (op1)) >= FIRST_PSEUDO_REGISTER
5021 && reg_renumber[regno] < 0
5022 && reg_equiv_constant[regno] != 0)
5023 op1 = reg_equiv_constant[regno];
5024 else if (GET_CODE (op0) == PLUS
5025 && (tem = subst_indexed_address (op0)) != op0)
5027 else if (GET_CODE (op1) == PLUS
5028 && (tem = subst_indexed_address (op1)) != op1)
5033 /* Pick out up to three things to add. */
5034 if (GET_CODE (op1) == PLUS)
5035 op2 = XEXP (op1, 1), op1 = XEXP (op1, 0);
5036 else if (GET_CODE (op0) == PLUS)
5037 op2 = op1, op1 = XEXP (op0, 1), op0 = XEXP (op0, 0);
5039 /* Compute the sum. */
5041 op1 = form_sum (op1, op2);
5043 op0 = form_sum (op0, op1);
5050 /* Record the pseudo registers we must reload into hard registers in a
5051 subexpression of a would-be memory address, X referring to a value
5052 in mode MODE. (This function is not called if the address we find
5055 CONTEXT = 1 means we are considering regs as index regs,
5056 = 0 means we are considering them as base regs.
5058 OPNUM and TYPE specify the purpose of any reloads made.
5060 IND_LEVELS says how many levels of indirect addressing are
5061 supported at this point in the address.
5063 INSN, if nonzero, is the insn in which we do the reload. It is used
5064 to determine if we may generate output reloads.
5066 We return nonzero if X, as a whole, is reloaded or replaced. */
5068 /* Note that we take shortcuts assuming that no multi-reg machine mode
5069 occurs as part of an address.
5070 Also, this is not fully machine-customizable; it works for machines
5071 such as vaxes and 68000's and 32000's, but other possible machines
5072 could have addressing modes that this does not handle right. */
5075 find_reloads_address_1 (mode, x, context, loc, opnum, type, ind_levels, insn)
5076 enum machine_mode mode;
5081 enum reload_type type;
5085 register RTX_CODE code = GET_CODE (x);
5091 register rtx orig_op0 = XEXP (x, 0);
5092 register rtx orig_op1 = XEXP (x, 1);
5093 register RTX_CODE code0 = GET_CODE (orig_op0);
5094 register RTX_CODE code1 = GET_CODE (orig_op1);
5095 register rtx op0 = orig_op0;
5096 register rtx op1 = orig_op1;
5098 if (GET_CODE (op0) == SUBREG)
5100 op0 = SUBREG_REG (op0);
5101 code0 = GET_CODE (op0);
5102 if (code0 == REG && REGNO (op0) < FIRST_PSEUDO_REGISTER)
5103 op0 = gen_rtx_REG (word_mode,
5104 REGNO (op0) + SUBREG_WORD (orig_op0));
5107 if (GET_CODE (op1) == SUBREG)
5109 op1 = SUBREG_REG (op1);
5110 code1 = GET_CODE (op1);
5111 if (code1 == REG && REGNO (op1) < FIRST_PSEUDO_REGISTER)
5112 op1 = gen_rtx_REG (GET_MODE (op1),
5113 REGNO (op1) + SUBREG_WORD (orig_op1));
5116 if (code0 == MULT || code0 == SIGN_EXTEND || code0 == TRUNCATE
5117 || code0 == ZERO_EXTEND || code1 == MEM)
5119 find_reloads_address_1 (mode, orig_op0, 1, &XEXP (x, 0), opnum,
5120 type, ind_levels, insn);
5121 find_reloads_address_1 (mode, orig_op1, 0, &XEXP (x, 1), opnum,
5122 type, ind_levels, insn);
5125 else if (code1 == MULT || code1 == SIGN_EXTEND || code1 == TRUNCATE
5126 || code1 == ZERO_EXTEND || code0 == MEM)
5128 find_reloads_address_1 (mode, orig_op0, 0, &XEXP (x, 0), opnum,
5129 type, ind_levels, insn);
5130 find_reloads_address_1 (mode, orig_op1, 1, &XEXP (x, 1), opnum,
5131 type, ind_levels, insn);
5134 else if (code0 == CONST_INT || code0 == CONST
5135 || code0 == SYMBOL_REF || code0 == LABEL_REF)
5136 find_reloads_address_1 (mode, orig_op1, 0, &XEXP (x, 1), opnum,
5137 type, ind_levels, insn);
5139 else if (code1 == CONST_INT || code1 == CONST
5140 || code1 == SYMBOL_REF || code1 == LABEL_REF)
5141 find_reloads_address_1 (mode, orig_op0, 0, &XEXP (x, 0), opnum,
5142 type, ind_levels, insn);
5144 else if (code0 == REG && code1 == REG)
5146 if (REG_OK_FOR_INDEX_P (op0)
5147 && REG_MODE_OK_FOR_BASE_P (op1, mode))
5149 else if (REG_OK_FOR_INDEX_P (op1)
5150 && REG_MODE_OK_FOR_BASE_P (op0, mode))
5152 else if (REG_MODE_OK_FOR_BASE_P (op1, mode))
5153 find_reloads_address_1 (mode, orig_op0, 1, &XEXP (x, 0), opnum,
5154 type, ind_levels, insn);
5155 else if (REG_MODE_OK_FOR_BASE_P (op0, mode))
5156 find_reloads_address_1 (mode, orig_op1, 1, &XEXP (x, 1), opnum,
5157 type, ind_levels, insn);
5158 else if (REG_OK_FOR_INDEX_P (op1))
5159 find_reloads_address_1 (mode, orig_op0, 0, &XEXP (x, 0), opnum,
5160 type, ind_levels, insn);
5161 else if (REG_OK_FOR_INDEX_P (op0))
5162 find_reloads_address_1 (mode, orig_op1, 0, &XEXP (x, 1), opnum,
5163 type, ind_levels, insn);
5166 find_reloads_address_1 (mode, orig_op0, 1, &XEXP (x, 0), opnum,
5167 type, ind_levels, insn);
5168 find_reloads_address_1 (mode, orig_op1, 0, &XEXP (x, 1), opnum,
5169 type, ind_levels, insn);
5173 else if (code0 == REG)
5175 find_reloads_address_1 (mode, orig_op0, 1, &XEXP (x, 0), opnum,
5176 type, ind_levels, insn);
5177 find_reloads_address_1 (mode, orig_op1, 0, &XEXP (x, 1), opnum,
5178 type, ind_levels, insn);
5181 else if (code1 == REG)
5183 find_reloads_address_1 (mode, orig_op1, 1, &XEXP (x, 1), opnum,
5184 type, ind_levels, insn);
5185 find_reloads_address_1 (mode, orig_op0, 0, &XEXP (x, 0), opnum,
5186 type, ind_levels, insn);
5196 if (GET_CODE (XEXP (x, 0)) == REG)
5198 register int regno = REGNO (XEXP (x, 0));
5202 /* A register that is incremented cannot be constant! */
5203 if (regno >= FIRST_PSEUDO_REGISTER
5204 && reg_equiv_constant[regno] != 0)
5207 /* Handle a register that is equivalent to a memory location
5208 which cannot be addressed directly. */
5209 if (reg_equiv_address[regno] != 0)
5211 rtx tem = make_memloc (XEXP (x, 0), regno);
5212 /* First reload the memory location's address.
5213 We can't use ADDR_TYPE (type) here, because we need to
5214 write back the value after reading it, hence we actually
5215 need two registers. */
5216 find_reloads_address (GET_MODE (tem), 0, XEXP (tem, 0),
5217 &XEXP (tem, 0), opnum, type,
5219 /* Put this inside a new increment-expression. */
5220 x = gen_rtx_fmt_e (GET_CODE (x), GET_MODE (x), tem);
5221 /* Proceed to reload that, as if it contained a register. */
5224 /* If we have a hard register that is ok as an index,
5225 don't make a reload. If an autoincrement of a nice register
5226 isn't "valid", it must be that no autoincrement is "valid".
5227 If that is true and something made an autoincrement anyway,
5228 this must be a special context where one is allowed.
5229 (For example, a "push" instruction.)
5230 We can't improve this address, so leave it alone. */
5232 /* Otherwise, reload the autoincrement into a suitable hard reg
5233 and record how much to increment by. */
5235 if (reg_renumber[regno] >= 0)
5236 regno = reg_renumber[regno];
5237 if ((regno >= FIRST_PSEUDO_REGISTER
5238 || !(context ? REGNO_OK_FOR_INDEX_P (regno)
5239 : REGNO_MODE_OK_FOR_BASE_P (regno, mode))))
5246 /* If we can output the register afterwards, do so, this
5247 saves the extra update.
5248 We can do so if we have an INSN - i.e. no JUMP_INSN nor
5249 CALL_INSN - and it does not set CC0.
5250 But don't do this if we cannot directly address the
5251 memory location, since this will make it harder to
5252 reuse address reloads, and increases register pressure.
5253 Also don't do this if we can probably update x directly. */
5254 rtx equiv = reg_equiv_mem[regno];
5255 int icode = (int) add_optab->handlers[(int) Pmode].insn_code;
5256 if (insn && GET_CODE (insn) == INSN && equiv
5258 && ! sets_cc0_p (PATTERN (insn))
5260 && ! (icode != CODE_FOR_nothing
5261 && (*insn_operand_predicate[icode][0]) (equiv, Pmode)
5262 && (*insn_operand_predicate[icode][1]) (equiv, Pmode)))
5267 = push_reload (x, x, loc, loc,
5269 ? reload_address_index_reg_class
5270 : reload_address_base_reg_class),
5271 GET_MODE (x), GET_MODE (x), 0, 0,
5272 opnum, RELOAD_OTHER);
5277 = push_reload (x, NULL_RTX, loc, NULL_PTR,
5279 ? reload_address_index_reg_class
5280 : reload_address_base_reg_class),
5281 GET_MODE (x), GET_MODE (x), 0, 0,
5283 reload_inc[reloadnum]
5284 = find_inc_amount (PATTERN (this_insn), XEXP (x_orig, 0));
5290 /* Update the REG_INC notes. */
5292 for (link = REG_NOTES (this_insn);
5293 link; link = XEXP (link, 1))
5294 if (REG_NOTE_KIND (link) == REG_INC
5295 && REGNO (XEXP (link, 0)) == REGNO (XEXP (x_orig, 0)))
5296 push_replacement (&XEXP (link, 0), reloadnum, VOIDmode);
5302 else if (GET_CODE (XEXP (x, 0)) == MEM)
5304 /* This is probably the result of a substitution, by eliminate_regs,
5305 of an equivalent address for a pseudo that was not allocated to a
5306 hard register. Verify that the specified address is valid and
5307 reload it into a register. */
5308 rtx tem = XEXP (x, 0);
5312 /* Since we know we are going to reload this item, don't decrement
5313 for the indirection level.
5315 Note that this is actually conservative: it would be slightly
5316 more efficient to use the value of SPILL_INDIRECT_LEVELS from
5318 /* We can't use ADDR_TYPE (type) here, because we need to
5319 write back the value after reading it, hence we actually
5320 need two registers. */
5321 find_reloads_address (GET_MODE (x), &XEXP (x, 0),
5322 XEXP (XEXP (x, 0), 0), &XEXP (XEXP (x, 0), 0),
5323 opnum, type, ind_levels, insn);
5325 reloadnum = push_reload (x, NULL_RTX, loc, NULL_PTR,
5327 ? reload_address_index_reg_class
5328 : reload_address_base_reg_class),
5329 GET_MODE (x), VOIDmode, 0, 0, opnum, type);
5330 reload_inc[reloadnum]
5331 = find_inc_amount (PATTERN (this_insn), XEXP (x, 0));
5333 link = FIND_REG_INC_NOTE (this_insn, tem);
5335 push_replacement (&XEXP (link, 0), reloadnum, VOIDmode);
5342 /* This is probably the result of a substitution, by eliminate_regs, of
5343 an equivalent address for a pseudo that was not allocated to a hard
5344 register. Verify that the specified address is valid and reload it
5347 Since we know we are going to reload this item, don't decrement for
5348 the indirection level.
5350 Note that this is actually conservative: it would be slightly more
5351 efficient to use the value of SPILL_INDIRECT_LEVELS from
5354 find_reloads_address (GET_MODE (x), loc, XEXP (x, 0), &XEXP (x, 0),
5355 opnum, ADDR_TYPE (type), ind_levels, insn);
5356 push_reload (*loc, NULL_RTX, loc, NULL_PTR,
5357 (context ? reload_address_index_reg_class
5358 : reload_address_base_reg_class),
5359 GET_MODE (x), VOIDmode, 0, 0, opnum, type);
5364 register int regno = REGNO (x);
5366 if (reg_equiv_constant[regno] != 0)
5368 find_reloads_address_part (reg_equiv_constant[regno], loc,
5370 ? reload_address_index_reg_class
5371 : reload_address_base_reg_class),
5372 GET_MODE (x), opnum, type, ind_levels);
5376 #if 0 /* This might screw code in reload1.c to delete prior output-reload
5377 that feeds this insn. */
5378 if (reg_equiv_mem[regno] != 0)
5380 push_reload (reg_equiv_mem[regno], NULL_RTX, loc, NULL_PTR,
5382 ? reload_address_index_reg_class
5383 : reload_address_base_reg_class),
5384 GET_MODE (x), VOIDmode, 0, 0, opnum, type);
5389 if (reg_equiv_address[regno] != 0)
5391 x = make_memloc (x, regno);
5392 find_reloads_address (GET_MODE (x), 0, XEXP (x, 0), &XEXP (x, 0),
5393 opnum, ADDR_TYPE (type), ind_levels, insn);
5396 if (reg_renumber[regno] >= 0)
5397 regno = reg_renumber[regno];
5399 if ((regno >= FIRST_PSEUDO_REGISTER
5400 || !(context ? REGNO_OK_FOR_INDEX_P (regno)
5401 : REGNO_MODE_OK_FOR_BASE_P (regno, mode))))
5403 push_reload (x, NULL_RTX, loc, NULL_PTR,
5405 ? reload_address_index_reg_class
5406 : reload_address_base_reg_class),
5407 GET_MODE (x), VOIDmode, 0, 0, opnum, type);
5411 /* If a register appearing in an address is the subject of a CLOBBER
5412 in this insn, reload it into some other register to be safe.
5413 The CLOBBER is supposed to make the register unavailable
5414 from before this insn to after it. */
5415 if (regno_clobbered_p (regno, this_insn))
5417 push_reload (x, NULL_RTX, loc, NULL_PTR,
5419 ? reload_address_index_reg_class
5420 : reload_address_base_reg_class),
5421 GET_MODE (x), VOIDmode, 0, 0, opnum, type);
5428 if (GET_CODE (SUBREG_REG (x)) == REG)
5430 /* If this is a SUBREG of a hard register and the resulting register
5431 is of the wrong class, reload the whole SUBREG. This avoids
5432 needless copies if SUBREG_REG is multi-word. */
5433 if (REGNO (SUBREG_REG (x)) < FIRST_PSEUDO_REGISTER)
5435 int regno = REGNO (SUBREG_REG (x)) + SUBREG_WORD (x);
5437 if (! (context ? REGNO_OK_FOR_INDEX_P (regno)
5438 : REGNO_MODE_OK_FOR_BASE_P (regno, mode)))
5440 push_reload (x, NULL_RTX, loc, NULL_PTR,
5442 ? reload_address_index_reg_class
5443 : reload_address_base_reg_class),
5444 GET_MODE (x), VOIDmode, 0, 0, opnum, type);
5448 /* If this is a SUBREG of a pseudo-register, and the pseudo-register
5449 is larger than the class size, then reload the whole SUBREG. */
5452 enum reg_class class = (context
5453 ? reload_address_index_reg_class
5454 : reload_address_base_reg_class);
5455 if (CLASS_MAX_NREGS (class, GET_MODE (SUBREG_REG (x)))
5456 > reg_class_size[class])
5458 push_reload (x, NULL_RTX, loc, NULL_PTR, class,
5459 GET_MODE (x), VOIDmode, 0, 0, opnum, type);
5471 register char *fmt = GET_RTX_FORMAT (code);
5474 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
5477 find_reloads_address_1 (mode, XEXP (x, i), context, &XEXP (x, i),
5478 opnum, type, ind_levels, insn);
5485 /* X, which is found at *LOC, is a part of an address that needs to be
5486 reloaded into a register of class CLASS. If X is a constant, or if
5487 X is a PLUS that contains a constant, check that the constant is a
5488 legitimate operand and that we are supposed to be able to load
5489 it into the register.
5491 If not, force the constant into memory and reload the MEM instead.
5493 MODE is the mode to use, in case X is an integer constant.
5495 OPNUM and TYPE describe the purpose of any reloads made.
5497 IND_LEVELS says how many levels of indirect addressing this machine
5501 find_reloads_address_part (x, loc, class, mode, opnum, type, ind_levels)
5504 enum reg_class class;
5505 enum machine_mode mode;
5507 enum reload_type type;
5511 && (! LEGITIMATE_CONSTANT_P (x)
5512 || PREFERRED_RELOAD_CLASS (x, class) == NO_REGS))
5514 rtx tem = x = force_const_mem (mode, x);
5515 find_reloads_address (mode, &tem, XEXP (tem, 0), &XEXP (tem, 0),
5516 opnum, type, ind_levels, 0);
5519 else if (GET_CODE (x) == PLUS
5520 && CONSTANT_P (XEXP (x, 1))
5521 && (! LEGITIMATE_CONSTANT_P (XEXP (x, 1))
5522 || PREFERRED_RELOAD_CLASS (XEXP (x, 1), class) == NO_REGS))
5524 rtx tem = force_const_mem (GET_MODE (x), XEXP (x, 1));
5526 x = gen_rtx_PLUS (GET_MODE (x), XEXP (x, 0), tem);
5527 find_reloads_address (mode, &tem, XEXP (tem, 0), &XEXP (tem, 0),
5528 opnum, type, ind_levels, 0);
5531 push_reload (x, NULL_RTX, loc, NULL_PTR, class,
5532 mode, VOIDmode, 0, 0, opnum, type);
5535 /* Substitute into the current INSN the registers into which we have reloaded
5536 the things that need reloading. The array `replacements'
5537 says contains the locations of all pointers that must be changed
5538 and says what to replace them with.
5540 Return the rtx that X translates into; usually X, but modified. */
5547 for (i = 0; i < n_replacements; i++)
5549 register struct replacement *r = &replacements[i];
5550 register rtx reloadreg = reload_reg_rtx[r->what];
5553 /* Encapsulate RELOADREG so its machine mode matches what
5554 used to be there. Note that gen_lowpart_common will
5555 do the wrong thing if RELOADREG is multi-word. RELOADREG
5556 will always be a REG here. */
5557 if (GET_MODE (reloadreg) != r->mode && r->mode != VOIDmode)
5558 reloadreg = gen_rtx_REG (r->mode, REGNO (reloadreg));
5560 /* If we are putting this into a SUBREG and RELOADREG is a
5561 SUBREG, we would be making nested SUBREGs, so we have to fix
5562 this up. Note that r->where == &SUBREG_REG (*r->subreg_loc). */
5564 if (r->subreg_loc != 0 && GET_CODE (reloadreg) == SUBREG)
5566 if (GET_MODE (*r->subreg_loc)
5567 == GET_MODE (SUBREG_REG (reloadreg)))
5568 *r->subreg_loc = SUBREG_REG (reloadreg);
5571 *r->where = SUBREG_REG (reloadreg);
5572 SUBREG_WORD (*r->subreg_loc) += SUBREG_WORD (reloadreg);
5576 *r->where = reloadreg;
5578 /* If reload got no reg and isn't optional, something's wrong. */
5579 else if (! reload_optional[r->what])
5584 /* Make a copy of any replacements being done into X and move those copies
5585 to locations in Y, a copy of X. We only look at the highest level of
5589 copy_replacements (x, y)
5594 enum rtx_code code = GET_CODE (x);
5595 char *fmt = GET_RTX_FORMAT (code);
5596 struct replacement *r;
5598 /* We can't support X being a SUBREG because we might then need to know its
5599 location if something inside it was replaced. */
5603 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
5605 for (j = 0; j < n_replacements; j++)
5607 if (replacements[j].subreg_loc == &XEXP (x, i))
5609 r = &replacements[n_replacements++];
5610 r->where = replacements[j].where;
5611 r->subreg_loc = &XEXP (y, i);
5612 r->what = replacements[j].what;
5613 r->mode = replacements[j].mode;
5615 else if (replacements[j].where == &XEXP (x, i))
5617 r = &replacements[n_replacements++];
5618 r->where = &XEXP (y, i);
5620 r->what = replacements[j].what;
5621 r->mode = replacements[j].mode;
5626 /* Change any replacements being done to *X to be done to *Y */
5629 move_replacements (x, y)
5635 for (i = 0; i < n_replacements; i++)
5636 if (replacements[i].subreg_loc == x)
5637 replacements[i].subreg_loc = y;
5638 else if (replacements[i].where == x)
5640 replacements[i].where = y;
5641 replacements[i].subreg_loc = 0;
5645 /* If LOC was scheduled to be replaced by something, return the replacement.
5646 Otherwise, return *LOC. */
5649 find_replacement (loc)
5652 struct replacement *r;
5654 for (r = &replacements[0]; r < &replacements[n_replacements]; r++)
5656 rtx reloadreg = reload_reg_rtx[r->what];
5658 if (reloadreg && r->where == loc)
5660 if (r->mode != VOIDmode && GET_MODE (reloadreg) != r->mode)
5661 reloadreg = gen_rtx_REG (r->mode, REGNO (reloadreg));
5665 else if (reloadreg && r->subreg_loc == loc)
5667 /* RELOADREG must be either a REG or a SUBREG.
5669 ??? Is it actually still ever a SUBREG? If so, why? */
5671 if (GET_CODE (reloadreg) == REG)
5672 return gen_rtx_REG (GET_MODE (*loc),
5673 REGNO (reloadreg) + SUBREG_WORD (*loc));
5674 else if (GET_MODE (reloadreg) == GET_MODE (*loc))
5677 return gen_rtx_SUBREG (GET_MODE (*loc), SUBREG_REG (reloadreg),
5678 SUBREG_WORD (reloadreg) + SUBREG_WORD (*loc));
5682 /* If *LOC is a PLUS, MINUS, or MULT, see if a replacement is scheduled for
5683 what's inside and make a new rtl if so. */
5684 if (GET_CODE (*loc) == PLUS || GET_CODE (*loc) == MINUS
5685 || GET_CODE (*loc) == MULT)
5687 rtx x = find_replacement (&XEXP (*loc, 0));
5688 rtx y = find_replacement (&XEXP (*loc, 1));
5690 if (x != XEXP (*loc, 0) || y != XEXP (*loc, 1))
5691 return gen_rtx_fmt_ee (GET_CODE (*loc), GET_MODE (*loc), x, y);
5697 /* Return nonzero if register in range [REGNO, ENDREGNO)
5698 appears either explicitly or implicitly in X
5699 other than being stored into (except for earlyclobber operands).
5701 References contained within the substructure at LOC do not count.
5702 LOC may be zero, meaning don't ignore anything.
5704 This is similar to refers_to_regno_p in rtlanal.c except that we
5705 look at equivalences for pseudos that didn't get hard registers. */
5708 refers_to_regno_for_reload_p (regno, endregno, x, loc)
5709 int regno, endregno;
5714 register RTX_CODE code;
5721 code = GET_CODE (x);
5728 /* If this is a pseudo, a hard register must not have been allocated.
5729 X must therefore either be a constant or be in memory. */
5730 if (i >= FIRST_PSEUDO_REGISTER)
5732 if (reg_equiv_memory_loc[i])
5733 return refers_to_regno_for_reload_p (regno, endregno,
5734 reg_equiv_memory_loc[i],
5737 if (reg_equiv_constant[i])
5743 return (endregno > i
5744 && regno < i + (i < FIRST_PSEUDO_REGISTER
5745 ? HARD_REGNO_NREGS (i, GET_MODE (x))
5749 /* If this is a SUBREG of a hard reg, we can see exactly which
5750 registers are being modified. Otherwise, handle normally. */
5751 if (GET_CODE (SUBREG_REG (x)) == REG
5752 && REGNO (SUBREG_REG (x)) < FIRST_PSEUDO_REGISTER)
5754 int inner_regno = REGNO (SUBREG_REG (x)) + SUBREG_WORD (x);
5756 = inner_regno + (inner_regno < FIRST_PSEUDO_REGISTER
5757 ? HARD_REGNO_NREGS (regno, GET_MODE (x)) : 1);
5759 return endregno > inner_regno && regno < inner_endregno;
5765 if (&SET_DEST (x) != loc
5766 /* Note setting a SUBREG counts as referring to the REG it is in for
5767 a pseudo but not for hard registers since we can
5768 treat each word individually. */
5769 && ((GET_CODE (SET_DEST (x)) == SUBREG
5770 && loc != &SUBREG_REG (SET_DEST (x))
5771 && GET_CODE (SUBREG_REG (SET_DEST (x))) == REG
5772 && REGNO (SUBREG_REG (SET_DEST (x))) >= FIRST_PSEUDO_REGISTER
5773 && refers_to_regno_for_reload_p (regno, endregno,
5774 SUBREG_REG (SET_DEST (x)),
5776 /* If the output is an earlyclobber operand, this is
5778 || ((GET_CODE (SET_DEST (x)) != REG
5779 || earlyclobber_operand_p (SET_DEST (x)))
5780 && refers_to_regno_for_reload_p (regno, endregno,
5781 SET_DEST (x), loc))))
5784 if (code == CLOBBER || loc == &SET_SRC (x))
5793 /* X does not match, so try its subexpressions. */
5795 fmt = GET_RTX_FORMAT (code);
5796 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
5798 if (fmt[i] == 'e' && loc != &XEXP (x, i))
5806 if (refers_to_regno_for_reload_p (regno, endregno,
5810 else if (fmt[i] == 'E')
5813 for (j = XVECLEN (x, i) - 1; j >=0; j--)
5814 if (loc != &XVECEXP (x, i, j)
5815 && refers_to_regno_for_reload_p (regno, endregno,
5816 XVECEXP (x, i, j), loc))
5823 /* Nonzero if modifying X will affect IN. If X is a register or a SUBREG,
5824 we check if any register number in X conflicts with the relevant register
5825 numbers. If X is a constant, return 0. If X is a MEM, return 1 iff IN
5826 contains a MEM (we don't bother checking for memory addresses that can't
5827 conflict because we expect this to be a rare case.
5829 This function is similar to reg_overlap_mention_p in rtlanal.c except
5830 that we look at equivalences for pseudos that didn't get hard registers. */
5833 reg_overlap_mentioned_for_reload_p (x, in)
5836 int regno, endregno;
5838 /* Overly conservative. */
5839 if (GET_CODE (x) == STRICT_LOW_PART)
5842 /* If either argument is a constant, then modifying X can not affect IN. */
5843 if (CONSTANT_P (x) || CONSTANT_P (in))
5845 else if (GET_CODE (x) == SUBREG)
5847 regno = REGNO (SUBREG_REG (x));
5848 if (regno < FIRST_PSEUDO_REGISTER)
5849 regno += SUBREG_WORD (x);
5851 else if (GET_CODE (x) == REG)
5855 /* If this is a pseudo, it must not have been assigned a hard register.
5856 Therefore, it must either be in memory or be a constant. */
5858 if (regno >= FIRST_PSEUDO_REGISTER)
5860 if (reg_equiv_memory_loc[regno])
5861 return refers_to_mem_for_reload_p (in);
5862 else if (reg_equiv_constant[regno])
5867 else if (GET_CODE (x) == MEM)
5868 return refers_to_mem_for_reload_p (in);
5869 else if (GET_CODE (x) == SCRATCH || GET_CODE (x) == PC
5870 || GET_CODE (x) == CC0)
5871 return reg_mentioned_p (x, in);
5875 endregno = regno + (regno < FIRST_PSEUDO_REGISTER
5876 ? HARD_REGNO_NREGS (regno, GET_MODE (x)) : 1);
5878 return refers_to_regno_for_reload_p (regno, endregno, in, NULL_PTR);
5881 /* Return nonzero if anything in X contains a MEM. Look also for pseudo
5885 refers_to_mem_for_reload_p (x)
5891 if (GET_CODE (x) == MEM)
5894 if (GET_CODE (x) == REG)
5895 return (REGNO (x) >= FIRST_PSEUDO_REGISTER
5896 && reg_equiv_memory_loc[REGNO (x)]);
5898 fmt = GET_RTX_FORMAT (GET_CODE (x));
5899 for (i = GET_RTX_LENGTH (GET_CODE (x)) - 1; i >= 0; i--)
5901 && (GET_CODE (XEXP (x, i)) == MEM
5902 || refers_to_mem_for_reload_p (XEXP (x, i))))
5908 /* Check the insns before INSN to see if there is a suitable register
5909 containing the same value as GOAL.
5910 If OTHER is -1, look for a register in class CLASS.
5911 Otherwise, just see if register number OTHER shares GOAL's value.
5913 Return an rtx for the register found, or zero if none is found.
5915 If RELOAD_REG_P is (short *)1,
5916 we reject any hard reg that appears in reload_reg_rtx
5917 because such a hard reg is also needed coming into this insn.
5919 If RELOAD_REG_P is any other nonzero value,
5920 it is a vector indexed by hard reg number
5921 and we reject any hard reg whose element in the vector is nonnegative
5922 as well as any that appears in reload_reg_rtx.
5924 If GOAL is zero, then GOALREG is a register number; we look
5925 for an equivalent for that register.
5927 MODE is the machine mode of the value we want an equivalence for.
5928 If GOAL is nonzero and not VOIDmode, then it must have mode MODE.
5930 This function is used by jump.c as well as in the reload pass.
5932 If GOAL is the sum of the stack pointer and a constant, we treat it
5933 as if it were a constant except that sp is required to be unchanging. */
5936 find_equiv_reg (goal, insn, class, other, reload_reg_p, goalreg, mode)
5939 enum reg_class class;
5941 short *reload_reg_p;
5943 enum machine_mode mode;
5945 register rtx p = insn;
5946 rtx goaltry, valtry, value, where;
5948 register int regno = -1;
5952 int goal_mem_addr_varies = 0;
5953 int need_stable_sp = 0;
5959 else if (GET_CODE (goal) == REG)
5960 regno = REGNO (goal);
5961 else if (GET_CODE (goal) == MEM)
5963 enum rtx_code code = GET_CODE (XEXP (goal, 0));
5964 if (MEM_VOLATILE_P (goal))
5966 if (flag_float_store && GET_MODE_CLASS (GET_MODE (goal)) == MODE_FLOAT)
5968 /* An address with side effects must be reexecuted. */
5981 else if (CONSTANT_P (goal))
5983 else if (GET_CODE (goal) == PLUS
5984 && XEXP (goal, 0) == stack_pointer_rtx
5985 && CONSTANT_P (XEXP (goal, 1)))
5986 goal_const = need_stable_sp = 1;
5987 else if (GET_CODE (goal) == PLUS
5988 && XEXP (goal, 0) == frame_pointer_rtx
5989 && CONSTANT_P (XEXP (goal, 1)))
5994 /* On some machines, certain regs must always be rejected
5995 because they don't behave the way ordinary registers do. */
5997 #ifdef OVERLAPPING_REGNO_P
5998 if (regno >= 0 && regno < FIRST_PSEUDO_REGISTER
5999 && OVERLAPPING_REGNO_P (regno))
6003 /* Scan insns back from INSN, looking for one that copies
6004 a value into or out of GOAL.
6005 Stop and give up if we reach a label. */
6010 if (p == 0 || GET_CODE (p) == CODE_LABEL)
6012 if (GET_CODE (p) == INSN
6013 /* If we don't want spill regs ... */
6014 && (! (reload_reg_p != 0
6015 && reload_reg_p != (short *) (HOST_WIDE_INT) 1)
6016 /* ... then ignore insns introduced by reload; they aren't useful
6017 and can cause results in reload_as_needed to be different
6018 from what they were when calculating the need for spills.
6019 If we notice an input-reload insn here, we will reject it below,
6020 but it might hide a usable equivalent. That makes bad code.
6021 It may even abort: perhaps no reg was spilled for this insn
6022 because it was assumed we would find that equivalent. */
6023 || INSN_UID (p) < reload_first_uid))
6026 pat = single_set (p);
6027 /* First check for something that sets some reg equal to GOAL. */
6030 && true_regnum (SET_SRC (pat)) == regno
6031 && (valueno = true_regnum (valtry = SET_DEST (pat))) >= 0)
6034 && true_regnum (SET_DEST (pat)) == regno
6035 && (valueno = true_regnum (valtry = SET_SRC (pat))) >= 0)
6037 (goal_const && rtx_equal_p (SET_SRC (pat), goal)
6038 /* When looking for stack pointer + const,
6039 make sure we don't use a stack adjust. */
6040 && !reg_overlap_mentioned_for_reload_p (SET_DEST (pat), goal)
6041 && (valueno = true_regnum (valtry = SET_DEST (pat))) >= 0)
6043 && (valueno = true_regnum (valtry = SET_DEST (pat))) >= 0
6044 && rtx_renumbered_equal_p (goal, SET_SRC (pat)))
6046 && (valueno = true_regnum (valtry = SET_SRC (pat))) >= 0
6047 && rtx_renumbered_equal_p (goal, SET_DEST (pat)))
6048 /* If we are looking for a constant,
6049 and something equivalent to that constant was copied
6050 into a reg, we can use that reg. */
6051 || (goal_const && (tem = find_reg_note (p, REG_EQUIV,
6053 && rtx_equal_p (XEXP (tem, 0), goal)
6054 && (valueno = true_regnum (valtry = SET_DEST (pat))) >= 0)
6055 || (goal_const && (tem = find_reg_note (p, REG_EQUIV,
6057 && GET_CODE (SET_DEST (pat)) == REG
6058 && GET_CODE (XEXP (tem, 0)) == CONST_DOUBLE
6059 && GET_MODE_CLASS (GET_MODE (XEXP (tem, 0))) == MODE_FLOAT
6060 && GET_CODE (goal) == CONST_INT
6061 && 0 != (goaltry = operand_subword (XEXP (tem, 0), 0, 0,
6063 && rtx_equal_p (goal, goaltry)
6064 && (valtry = operand_subword (SET_DEST (pat), 0, 0,
6066 && (valueno = true_regnum (valtry)) >= 0)
6067 || (goal_const && (tem = find_reg_note (p, REG_EQUIV,
6069 && GET_CODE (SET_DEST (pat)) == REG
6070 && GET_CODE (XEXP (tem, 0)) == CONST_DOUBLE
6071 && GET_MODE_CLASS (GET_MODE (XEXP (tem, 0))) == MODE_FLOAT
6072 && GET_CODE (goal) == CONST_INT
6073 && 0 != (goaltry = operand_subword (XEXP (tem, 0), 1, 0,
6075 && rtx_equal_p (goal, goaltry)
6077 = operand_subword (SET_DEST (pat), 1, 0, VOIDmode))
6078 && (valueno = true_regnum (valtry)) >= 0)))
6081 : ((unsigned) valueno < FIRST_PSEUDO_REGISTER
6082 && TEST_HARD_REG_BIT (reg_class_contents[(int) class],
6092 /* We found a previous insn copying GOAL into a suitable other reg VALUE
6093 (or copying VALUE into GOAL, if GOAL is also a register).
6094 Now verify that VALUE is really valid. */
6096 /* VALUENO is the register number of VALUE; a hard register. */
6098 /* Don't try to re-use something that is killed in this insn. We want
6099 to be able to trust REG_UNUSED notes. */
6100 if (find_reg_note (where, REG_UNUSED, value))
6103 /* If we propose to get the value from the stack pointer or if GOAL is
6104 a MEM based on the stack pointer, we need a stable SP. */
6105 if (valueno == STACK_POINTER_REGNUM || regno == STACK_POINTER_REGNUM
6106 || (goal_mem && reg_overlap_mentioned_for_reload_p (stack_pointer_rtx,
6110 /* Reject VALUE if the copy-insn moved the wrong sort of datum. */
6111 if (GET_MODE (value) != mode)
6114 /* Reject VALUE if it was loaded from GOAL
6115 and is also a register that appears in the address of GOAL. */
6117 if (goal_mem && value == SET_DEST (single_set (where))
6118 && refers_to_regno_for_reload_p (valueno,
6120 + HARD_REGNO_NREGS (valueno, mode)),
6124 /* Reject registers that overlap GOAL. */
6126 if (!goal_mem && !goal_const
6127 && regno + HARD_REGNO_NREGS (regno, mode) > valueno
6128 && regno < valueno + HARD_REGNO_NREGS (valueno, mode))
6131 /* Reject VALUE if it is one of the regs reserved for reloads.
6132 Reload1 knows how to reuse them anyway, and it would get
6133 confused if we allocated one without its knowledge.
6134 (Now that insns introduced by reload are ignored above,
6135 this case shouldn't happen, but I'm not positive.) */
6137 if (reload_reg_p != 0 && reload_reg_p != (short *) (HOST_WIDE_INT) 1
6138 && reload_reg_p[valueno] >= 0)
6141 /* On some machines, certain regs must always be rejected
6142 because they don't behave the way ordinary registers do. */
6144 #ifdef OVERLAPPING_REGNO_P
6145 if (OVERLAPPING_REGNO_P (valueno))
6149 nregs = HARD_REGNO_NREGS (regno, mode);
6150 valuenregs = HARD_REGNO_NREGS (valueno, mode);
6152 /* Reject VALUE if it is a register being used for an input reload
6153 even if it is not one of those reserved. */
6155 if (reload_reg_p != 0)
6158 for (i = 0; i < n_reloads; i++)
6159 if (reload_reg_rtx[i] != 0 && reload_in[i])
6161 int regno1 = REGNO (reload_reg_rtx[i]);
6162 int nregs1 = HARD_REGNO_NREGS (regno1,
6163 GET_MODE (reload_reg_rtx[i]));
6164 if (regno1 < valueno + valuenregs
6165 && regno1 + nregs1 > valueno)
6171 /* We must treat frame pointer as varying here,
6172 since it can vary--in a nonlocal goto as generated by expand_goto. */
6173 goal_mem_addr_varies = !CONSTANT_ADDRESS_P (XEXP (goal, 0));
6175 /* Now verify that the values of GOAL and VALUE remain unaltered
6176 until INSN is reached. */
6185 /* Don't trust the conversion past a function call
6186 if either of the two is in a call-clobbered register, or memory. */
6187 if (GET_CODE (p) == CALL_INSN
6188 && ((regno >= 0 && regno < FIRST_PSEUDO_REGISTER
6189 && call_used_regs[regno])
6191 (valueno >= 0 && valueno < FIRST_PSEUDO_REGISTER
6192 && call_used_regs[valueno])
6198 #ifdef NON_SAVING_SETJMP
6199 if (NON_SAVING_SETJMP && GET_CODE (p) == NOTE
6200 && NOTE_LINE_NUMBER (p) == NOTE_INSN_SETJMP)
6204 #ifdef INSN_CLOBBERS_REGNO_P
6205 if ((valueno >= 0 && valueno < FIRST_PSEUDO_REGISTER
6206 && INSN_CLOBBERS_REGNO_P (p, valueno))
6207 || (regno >= 0 && regno < FIRST_PSEUDO_REGISTER
6208 && INSN_CLOBBERS_REGNO_P (p, regno)))
6212 if (GET_RTX_CLASS (GET_CODE (p)) == 'i')
6216 /* Watch out for unspec_volatile, and volatile asms. */
6217 if (volatile_insn_p (pat))
6220 /* If this insn P stores in either GOAL or VALUE, return 0.
6221 If GOAL is a memory ref and this insn writes memory, return 0.
6222 If GOAL is a memory ref and its address is not constant,
6223 and this insn P changes a register used in GOAL, return 0. */
6225 if (GET_CODE (pat) == SET || GET_CODE (pat) == CLOBBER)
6227 register rtx dest = SET_DEST (pat);
6228 while (GET_CODE (dest) == SUBREG
6229 || GET_CODE (dest) == ZERO_EXTRACT
6230 || GET_CODE (dest) == SIGN_EXTRACT
6231 || GET_CODE (dest) == STRICT_LOW_PART)
6232 dest = XEXP (dest, 0);
6233 if (GET_CODE (dest) == REG)
6235 register int xregno = REGNO (dest);
6237 if (REGNO (dest) < FIRST_PSEUDO_REGISTER)
6238 xnregs = HARD_REGNO_NREGS (xregno, GET_MODE (dest));
6241 if (xregno < regno + nregs && xregno + xnregs > regno)
6243 if (xregno < valueno + valuenregs
6244 && xregno + xnregs > valueno)
6246 if (goal_mem_addr_varies
6247 && reg_overlap_mentioned_for_reload_p (dest, goal))
6249 if (xregno == STACK_POINTER_REGNUM && need_stable_sp)
6252 else if (goal_mem && GET_CODE (dest) == MEM
6253 && ! push_operand (dest, GET_MODE (dest)))
6255 else if (GET_CODE (dest) == MEM && regno >= FIRST_PSEUDO_REGISTER
6256 && reg_equiv_memory_loc[regno] != 0)
6258 else if (need_stable_sp && push_operand (dest, GET_MODE (dest)))
6261 else if (GET_CODE (pat) == PARALLEL)
6264 for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)
6266 register rtx v1 = XVECEXP (pat, 0, i);
6267 if (GET_CODE (v1) == SET || GET_CODE (v1) == CLOBBER)
6269 register rtx dest = SET_DEST (v1);
6270 while (GET_CODE (dest) == SUBREG
6271 || GET_CODE (dest) == ZERO_EXTRACT
6272 || GET_CODE (dest) == SIGN_EXTRACT
6273 || GET_CODE (dest) == STRICT_LOW_PART)
6274 dest = XEXP (dest, 0);
6275 if (GET_CODE (dest) == REG)
6277 register int xregno = REGNO (dest);
6279 if (REGNO (dest) < FIRST_PSEUDO_REGISTER)
6280 xnregs = HARD_REGNO_NREGS (xregno, GET_MODE (dest));
6283 if (xregno < regno + nregs
6284 && xregno + xnregs > regno)
6286 if (xregno < valueno + valuenregs
6287 && xregno + xnregs > valueno)
6289 if (goal_mem_addr_varies
6290 && reg_overlap_mentioned_for_reload_p (dest,
6293 if (xregno == STACK_POINTER_REGNUM && need_stable_sp)
6296 else if (goal_mem && GET_CODE (dest) == MEM
6297 && ! push_operand (dest, GET_MODE (dest)))
6299 else if (GET_CODE (dest) == MEM && regno >= FIRST_PSEUDO_REGISTER
6300 && reg_equiv_memory_loc[regno] != 0)
6302 else if (need_stable_sp
6303 && push_operand (dest, GET_MODE (dest)))
6309 if (GET_CODE (p) == CALL_INSN && CALL_INSN_FUNCTION_USAGE (p))
6313 for (link = CALL_INSN_FUNCTION_USAGE (p); XEXP (link, 1) != 0;
6314 link = XEXP (link, 1))
6316 pat = XEXP (link, 0);
6317 if (GET_CODE (pat) == CLOBBER)
6319 register rtx dest = SET_DEST (pat);
6320 while (GET_CODE (dest) == SUBREG
6321 || GET_CODE (dest) == ZERO_EXTRACT
6322 || GET_CODE (dest) == SIGN_EXTRACT
6323 || GET_CODE (dest) == STRICT_LOW_PART)
6324 dest = XEXP (dest, 0);
6325 if (GET_CODE (dest) == REG)
6327 register int xregno = REGNO (dest);
6329 if (REGNO (dest) < FIRST_PSEUDO_REGISTER)
6330 xnregs = HARD_REGNO_NREGS (xregno, GET_MODE (dest));
6333 if (xregno < regno + nregs
6334 && xregno + xnregs > regno)
6336 if (xregno < valueno + valuenregs
6337 && xregno + xnregs > valueno)
6339 if (goal_mem_addr_varies
6340 && reg_overlap_mentioned_for_reload_p (dest,
6344 else if (goal_mem && GET_CODE (dest) == MEM
6345 && ! push_operand (dest, GET_MODE (dest)))
6347 else if (need_stable_sp
6348 && push_operand (dest, GET_MODE (dest)))
6355 /* If this insn auto-increments or auto-decrements
6356 either regno or valueno, return 0 now.
6357 If GOAL is a memory ref and its address is not constant,
6358 and this insn P increments a register used in GOAL, return 0. */
6362 for (link = REG_NOTES (p); link; link = XEXP (link, 1))
6363 if (REG_NOTE_KIND (link) == REG_INC
6364 && GET_CODE (XEXP (link, 0)) == REG)
6366 register int incno = REGNO (XEXP (link, 0));
6367 if (incno < regno + nregs && incno >= regno)
6369 if (incno < valueno + valuenregs && incno >= valueno)
6371 if (goal_mem_addr_varies
6372 && reg_overlap_mentioned_for_reload_p (XEXP (link, 0),
6382 /* Find a place where INCED appears in an increment or decrement operator
6383 within X, and return the amount INCED is incremented or decremented by.
6384 The value is always positive. */
6387 find_inc_amount (x, inced)
6390 register enum rtx_code code = GET_CODE (x);
6396 register rtx addr = XEXP (x, 0);
6397 if ((GET_CODE (addr) == PRE_DEC
6398 || GET_CODE (addr) == POST_DEC
6399 || GET_CODE (addr) == PRE_INC
6400 || GET_CODE (addr) == POST_INC)
6401 && XEXP (addr, 0) == inced)
6402 return GET_MODE_SIZE (GET_MODE (x));
6405 fmt = GET_RTX_FORMAT (code);
6406 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
6410 register int tem = find_inc_amount (XEXP (x, i), inced);
6417 for (j = XVECLEN (x, i) - 1; j >= 0; j--)
6419 register int tem = find_inc_amount (XVECEXP (x, i, j), inced);
6429 /* Return 1 if register REGNO is the subject of a clobber in insn INSN. */
6432 regno_clobbered_p (regno, insn)
6436 if (GET_CODE (PATTERN (insn)) == CLOBBER
6437 && GET_CODE (XEXP (PATTERN (insn), 0)) == REG)
6438 return REGNO (XEXP (PATTERN (insn), 0)) == regno;
6440 if (GET_CODE (PATTERN (insn)) == PARALLEL)
6442 int i = XVECLEN (PATTERN (insn), 0) - 1;
6446 rtx elt = XVECEXP (PATTERN (insn), 0, i);
6447 if (GET_CODE (elt) == CLOBBER && GET_CODE (XEXP (elt, 0)) == REG
6448 && REGNO (XEXP (elt, 0)) == regno)
6456 static char *reload_when_needed_name[] =
6459 "RELOAD_FOR_OUTPUT",
6461 "RELOAD_FOR_INPUT_ADDRESS",
6462 "RELOAD_FOR_INPADDR_ADDRESS",
6463 "RELOAD_FOR_OUTPUT_ADDRESS",
6464 "RELOAD_FOR_OUTADDR_ADDRESS",
6465 "RELOAD_FOR_OPERAND_ADDRESS",
6466 "RELOAD_FOR_OPADDR_ADDR",
6468 "RELOAD_FOR_OTHER_ADDRESS"
6471 static char *reg_class_names[] = REG_CLASS_NAMES;
6473 /* These functions are used to print the variables set by 'find_reloads' */
6476 debug_reload_to_stream (f)
6484 for (r = 0; r < n_reloads; r++)
6486 fprintf (f, "Reload %d: ", r);
6488 if (reload_in[r] != 0)
6490 fprintf (f, "reload_in (%s) = ",
6491 GET_MODE_NAME (reload_inmode[r]));
6492 print_inline_rtx (f, reload_in[r], 24);
6493 fprintf (f, "\n\t");
6496 if (reload_out[r] != 0)
6498 fprintf (f, "reload_out (%s) = ",
6499 GET_MODE_NAME (reload_outmode[r]));
6500 print_inline_rtx (f, reload_out[r], 24);
6501 fprintf (f, "\n\t");
6504 fprintf (f, "%s, ", reg_class_names[(int) reload_reg_class[r]]);
6506 fprintf (f, "%s (opnum = %d)",
6507 reload_when_needed_name[(int) reload_when_needed[r]],
6510 if (reload_optional[r])
6511 fprintf (f, ", optional");
6513 if (reload_nongroup[r])
6514 fprintf (stderr, ", nongroup");
6516 if (reload_inc[r] != 0)
6517 fprintf (f, ", inc by %d", reload_inc[r]);
6519 if (reload_nocombine[r])
6520 fprintf (f, ", can't combine");
6522 if (reload_secondary_p[r])
6523 fprintf (f, ", secondary_reload_p");
6525 if (reload_in_reg[r] != 0)
6527 fprintf (f, "\n\treload_in_reg: ");
6528 print_inline_rtx (f, reload_in_reg[r], 24);
6531 if (reload_reg_rtx[r] != 0)
6533 fprintf (f, "\n\treload_reg_rtx: ");
6534 print_inline_rtx (f, reload_reg_rtx[r], 24);
6538 if (reload_secondary_in_reload[r] != -1)
6540 fprintf (f, "%ssecondary_in_reload = %d",
6541 prefix, reload_secondary_in_reload[r]);
6545 if (reload_secondary_out_reload[r] != -1)
6546 fprintf (f, "%ssecondary_out_reload = %d\n",
6547 prefix, reload_secondary_out_reload[r]);
6550 if (reload_secondary_in_icode[r] != CODE_FOR_nothing)
6552 fprintf (stderr, "%ssecondary_in_icode = %s", prefix,
6553 insn_name[reload_secondary_in_icode[r]]);
6557 if (reload_secondary_out_icode[r] != CODE_FOR_nothing)
6558 fprintf (stderr, "%ssecondary_out_icode = %s", prefix,
6559 insn_name[reload_secondary_out_icode[r]]);
6568 debug_reload_to_stream (stderr);
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