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Don't print CONST_DOUBLE as floating point if not MODE_FLOAT
[gcc.git] / gcc / config / mips / mips.c
1 /* Subroutines for insn-output.c for MIPS
2 Contributed by A. Lichnewsky, lich@inria.inria.fr.
3 Changes by Michael Meissner, meissner@osf.org.
4 64 bit r4000 support by Ian Lance Taylor, ian@cygnus.com, and
5 Brendan Eich, brendan@microunity.com.
6 Copyright (C) 1989, 1990, 1991, 1993, 1994 Free Software Foundation, Inc.
7
8 This file is part of GNU CC.
9
10 GNU CC is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
13 any later version.
14
15 GNU CC is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with GNU CC; see the file COPYING. If not, write to
22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
23
24 /* ??? The TARGET_FP_CALL_32 macros are intended to simulate a 32 bit
25 calling convention in 64 bit mode. It doesn't work though, and should
26 be replaced with something better designed. */
27
28 #include "config.h"
29 #include "rtl.h"
30 #include "regs.h"
31 #include "hard-reg-set.h"
32 #include "real.h"
33 #include "insn-config.h"
34 #include "conditions.h"
35 #include "insn-flags.h"
36 #include "insn-attr.h"
37 #include "insn-codes.h"
38 #include "recog.h"
39 #include "output.h"
40
41 #undef MAX /* sys/param.h may also define these */
42 #undef MIN
43
44 #include <stdio.h>
45 #include <signal.h>
46 #include <sys/types.h>
47 #include <sys/file.h>
48 #include <ctype.h>
49 #include "tree.h"
50 #include "expr.h"
51 #include "flags.h"
52
53 #ifndef R_OK
54 #define R_OK 4
55 #define W_OK 2
56 #define X_OK 1
57 #endif
58
59 #if defined(USG) || defined(NO_STAB_H)
60 #include "gstab.h" /* If doing DBX on sysV, use our own stab.h. */
61 #else
62 #include <stab.h> /* On BSD, use the system's stab.h. */
63 #endif /* not USG */
64
65 #ifdef __GNU_STAB__
66 #define STAB_CODE_TYPE enum __stab_debug_code
67 #else
68 #define STAB_CODE_TYPE int
69 #endif
70
71 extern void abort ();
72 extern int atoi ();
73 extern char *getenv ();
74 extern char *mktemp ();
75
76 extern rtx adj_offsettable_operand ();
77 extern rtx copy_to_reg ();
78 extern void error ();
79 extern void fatal ();
80 extern tree lookup_name ();
81 extern void pfatal_with_name ();
82 extern void warning ();
83
84 extern tree current_function_decl;
85 extern FILE *asm_out_file;
86
87 /* Enumeration for all of the relational tests, so that we can build
88 arrays indexed by the test type, and not worry about the order
89 of EQ, NE, etc. */
90
91 enum internal_test {
92 ITEST_EQ,
93 ITEST_NE,
94 ITEST_GT,
95 ITEST_GE,
96 ITEST_LT,
97 ITEST_LE,
98 ITEST_GTU,
99 ITEST_GEU,
100 ITEST_LTU,
101 ITEST_LEU,
102 ITEST_MAX
103 };
104
105 /* Global variables for machine-dependent things. */
106
107 /* Threshold for data being put into the small data/bss area, instead
108 of the normal data area (references to the small data/bss area take
109 1 instruction, and use the global pointer, references to the normal
110 data area takes 2 instructions). */
111 int mips_section_threshold = -1;
112
113 /* Count the number of .file directives, so that .loc is up to date. */
114 int num_source_filenames = 0;
115
116 /* Count the number of sdb related labels are generated (to find block
117 start and end boundaries). */
118 int sdb_label_count = 0;
119
120 /* Next label # for each statment for Silicon Graphics IRIS systems. */
121 int sym_lineno = 0;
122
123 /* Non-zero if inside of a function, because the stupid MIPS asm can't
124 handle .files inside of functions. */
125 int inside_function = 0;
126
127 /* Files to separate the text and the data output, so that all of the data
128 can be emitted before the text, which will mean that the assembler will
129 generate smaller code, based on the global pointer. */
130 FILE *asm_out_data_file;
131 FILE *asm_out_text_file;
132
133 /* Linked list of all externals that are to be emitted when optimizing
134 for the global pointer if they haven't been declared by the end of
135 the program with an appropriate .comm or initialization. */
136
137 struct extern_list {
138 struct extern_list *next; /* next external */
139 char *name; /* name of the external */
140 int size; /* size in bytes */
141 } *extern_head = 0;
142
143 /* Name of the file containing the current function. */
144 char *current_function_file = "";
145
146 /* Warning given that Mips ECOFF can't support changing files
147 within a function. */
148 int file_in_function_warning = FALSE;
149
150 /* Whether to suppress issuing .loc's because the user attempted
151 to change the filename within a function. */
152 int ignore_line_number = FALSE;
153
154 /* Number of nested .set noreorder, noat, nomacro, and volatile requests. */
155 int set_noreorder;
156 int set_noat;
157 int set_nomacro;
158 int set_volatile;
159
160 /* The next branch instruction is a branch likely, not branch normal. */
161 int mips_branch_likely;
162
163 /* Count of delay slots and how many are filled. */
164 int dslots_load_total;
165 int dslots_load_filled;
166 int dslots_jump_total;
167 int dslots_jump_filled;
168
169 /* # of nops needed by previous insn */
170 int dslots_number_nops;
171
172 /* Number of 1/2/3 word references to data items (ie, not jal's). */
173 int num_refs[3];
174
175 /* registers to check for load delay */
176 rtx mips_load_reg, mips_load_reg2, mips_load_reg3, mips_load_reg4;
177
178 /* Cached operands, and operator to compare for use in set/branch on
179 condition codes. */
180 rtx branch_cmp[2];
181
182 /* what type of branch to use */
183 enum cmp_type branch_type;
184
185 /* Number of previously seen half-pic pointers and references. */
186 static int prev_half_pic_ptrs = 0;
187 static int prev_half_pic_refs = 0;
188
189 /* which cpu are we scheduling for */
190 enum processor_type mips_cpu;
191
192 /* which instruction set architecture to use. */
193 int mips_isa;
194
195 /* Strings to hold which cpu and instruction set architecture to use. */
196 char *mips_cpu_string; /* for -mcpu=<xxx> */
197 char *mips_isa_string; /* for -mips{1,2,3} */
198
199 /* Generating calls to position independent functions? */
200 enum mips_abicalls_type mips_abicalls;
201
202 /* High and low marks for floating point values which we will accept
203 as legitimate constants for LEGITIMATE_CONSTANT_P. These are
204 initialized in override_options. */
205 REAL_VALUE_TYPE dfhigh, dflow, sfhigh, sflow;
206
207 /* Array giving truth value on whether or not a given hard register
208 can support a given mode. */
209 char mips_hard_regno_mode_ok[(int)MAX_MACHINE_MODE][FIRST_PSEUDO_REGISTER];
210
211 /* Current frame information calculated by compute_frame_size. */
212 struct mips_frame_info current_frame_info;
213
214 /* Zero structure to initialize current_frame_info. */
215 struct mips_frame_info zero_frame_info;
216
217 /* Temporary filename used to buffer .text until end of program
218 for -mgpopt. */
219 static char *temp_filename;
220
221 /* Pseudo-reg holding the address of the current function when
222 generating embedded PIC code. Created by LEGITIMIZE_ADDRESS, used
223 by mips_finalize_pic if it was created. */
224 rtx embedded_pic_fnaddr_rtx;
225
226 /* List of all MIPS punctuation characters used by print_operand. */
227 char mips_print_operand_punct[256];
228
229 /* Map GCC register number to debugger register number. */
230 int mips_dbx_regno[FIRST_PSEUDO_REGISTER];
231
232 /* Buffer to use to enclose a load/store operation with %{ %} to
233 turn on .set volatile. */
234 static char volatile_buffer[60];
235
236 /* Hardware names for the registers. If -mrnames is used, this
237 will be overwritten with mips_sw_reg_names. */
238
239 char mips_reg_names[][8] =
240 {
241 "$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7",
242 "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15",
243 "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",
244 "$24", "$25", "$26", "$27", "$28", "$sp", "$fp", "$31",
245 "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7",
246 "$f8", "$f9", "$f10", "$f11", "$f12", "$f13", "$f14", "$f15",
247 "$f16", "$f17", "$f18", "$f19", "$f20", "$f21", "$f22", "$f23",
248 "$f24", "$f25", "$f26", "$f27", "$f28", "$f29", "$f30", "$f31",
249 "hi", "lo", "$fcr31"
250 };
251
252 /* Mips software names for the registers, used to overwrite the
253 mips_reg_names array. */
254
255 char mips_sw_reg_names[][8] =
256 {
257 "$zero","$at", "$v0", "$v1", "$a0", "$a1", "$a2", "$a3",
258 "$t0", "$t1", "$t2", "$t3", "$t4", "$t5", "$t6", "$t7",
259 "$s0", "$s1", "$s2", "$s3", "$s4", "$s5", "$s6", "$s7",
260 "$t8", "$t9", "$k0", "$k1", "$gp", "$sp", "$fp", "$ra",
261 "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7",
262 "$f8", "$f9", "$f10", "$f11", "$f12", "$f13", "$f14", "$f15",
263 "$f16", "$f17", "$f18", "$f19", "$f20", "$f21", "$f22", "$f23",
264 "$f24", "$f25", "$f26", "$f27", "$f28", "$f29", "$f30", "$f31",
265 "hi", "lo", "$fcr31"
266 };
267
268 /* Map hard register number to register class */
269 enum reg_class mips_regno_to_class[] =
270 {
271 GR_REGS, GR_REGS, GR_REGS, GR_REGS,
272 GR_REGS, GR_REGS, GR_REGS, GR_REGS,
273 GR_REGS, GR_REGS, GR_REGS, GR_REGS,
274 GR_REGS, GR_REGS, GR_REGS, GR_REGS,
275 GR_REGS, GR_REGS, GR_REGS, GR_REGS,
276 GR_REGS, GR_REGS, GR_REGS, GR_REGS,
277 GR_REGS, GR_REGS, GR_REGS, GR_REGS,
278 GR_REGS, GR_REGS, GR_REGS, GR_REGS,
279 FP_REGS, FP_REGS, FP_REGS, FP_REGS,
280 FP_REGS, FP_REGS, FP_REGS, FP_REGS,
281 FP_REGS, FP_REGS, FP_REGS, FP_REGS,
282 FP_REGS, FP_REGS, FP_REGS, FP_REGS,
283 FP_REGS, FP_REGS, FP_REGS, FP_REGS,
284 FP_REGS, FP_REGS, FP_REGS, FP_REGS,
285 FP_REGS, FP_REGS, FP_REGS, FP_REGS,
286 FP_REGS, FP_REGS, FP_REGS, FP_REGS,
287 HI_REG, LO_REG, ST_REGS
288 };
289
290 /* Map register constraint character to register class. */
291 enum reg_class mips_char_to_class[256] =
292 {
293 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
294 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
295 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
296 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
297 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
298 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
299 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
300 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
301 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
302 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
303 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
304 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
305 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
306 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
307 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
308 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
309 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
310 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
311 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
312 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
313 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
314 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
315 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
316 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
317 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
318 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
319 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
320 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
321 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
322 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
323 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
324 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
325 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
326 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
327 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
328 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
329 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
330 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
331 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
332 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
333 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
334 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
335 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
336 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
337 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
338 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
339 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
340 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
341 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
342 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
343 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
344 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
345 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
346 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
347 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
348 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
349 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
350 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
351 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
352 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
353 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
354 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
355 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
356 NO_REGS, NO_REGS, NO_REGS, NO_REGS,
357 };
358
359 \f
360 /* Return truth value of whether OP can be used as an operands
361 where a register or 16 bit unsigned integer is needed. */
362
363 int
364 uns_arith_operand (op, mode)
365 rtx op;
366 enum machine_mode mode;
367 {
368 if (GET_CODE (op) == CONST_INT && SMALL_INT_UNSIGNED (op))
369 return TRUE;
370
371 return register_operand (op, mode);
372 }
373
374 /* Return truth value of whether OP can be used as an operands
375 where a 16 bit integer is needed */
376
377 int
378 arith_operand (op, mode)
379 rtx op;
380 enum machine_mode mode;
381 {
382 if (GET_CODE (op) == CONST_INT && SMALL_INT (op))
383 return TRUE;
384
385 return register_operand (op, mode);
386 }
387
388 /* Return truth value of whether OP can be used as an operand in a two
389 address arithmetic insn (such as set 123456,%o4) of mode MODE. */
390
391 int
392 arith32_operand (op, mode)
393 rtx op;
394 enum machine_mode mode;
395 {
396 if (GET_CODE (op) == CONST_INT)
397 return TRUE;
398
399 return register_operand (op, mode);
400 }
401
402 /* Return truth value of whether OP is a integer which fits in 16 bits */
403
404 int
405 small_int (op, mode)
406 rtx op;
407 enum machine_mode mode;
408 {
409 return (GET_CODE (op) == CONST_INT && SMALL_INT (op));
410 }
411
412 /* Return truth value of whether OP is an integer which is too big to
413 be loaded with one instruction. */
414
415 int
416 large_int (op, mode)
417 rtx op;
418 enum machine_mode mode;
419 {
420 HOST_WIDE_INT value;
421
422 if (GET_CODE (op) != CONST_INT)
423 return FALSE;
424
425 value = INTVAL (op);
426 if ((value & ~0x0000ffff) == 0) /* ior reg,$r0,value */
427 return FALSE;
428
429 if (((unsigned long)(value + 32768)) <= 32767) /* subu reg,$r0,value */
430 return FALSE;
431
432 if ((value & 0x0000ffff) == 0 /* lui reg,value>>16 */
433 && ((value & ~2147483647) == 0 /* signed value */
434 || (value & ~2147483647) == ~2147483647))
435 return FALSE;
436
437 return TRUE;
438 }
439
440 /* Return truth value of whether OP is a register or the constant 0. */
441
442 int
443 reg_or_0_operand (op, mode)
444 rtx op;
445 enum machine_mode mode;
446 {
447 switch (GET_CODE (op))
448 {
449 default:
450 break;
451
452 case CONST_INT:
453 return (INTVAL (op) == 0);
454
455 case CONST_DOUBLE:
456 if (op != CONST0_RTX (mode))
457 return FALSE;
458
459 return TRUE;
460
461 case REG:
462 case SUBREG:
463 return register_operand (op, mode);
464 }
465
466 return FALSE;
467 }
468
469 /* Return truth value if a CONST_DOUBLE is ok to be a legitimate constant. */
470
471 int
472 mips_const_double_ok (op, mode)
473 rtx op;
474 enum machine_mode mode;
475 {
476 REAL_VALUE_TYPE d;
477
478 if (GET_CODE (op) != CONST_DOUBLE)
479 return FALSE;
480
481 if (mode == VOIDmode)
482 return TRUE;
483
484 if (mode != SFmode && mode != DFmode)
485 return FALSE;
486
487 if (op == CONST0_RTX (mode))
488 return TRUE;
489
490 REAL_VALUE_FROM_CONST_DOUBLE (d, op);
491
492 if (REAL_VALUE_ISNAN (d))
493 return FALSE;
494
495 if (REAL_VALUE_NEGATIVE (d))
496 d = REAL_VALUE_NEGATE (d);
497
498 if (mode == DFmode)
499 {
500 if (REAL_VALUES_LESS (d, dfhigh)
501 && REAL_VALUES_LESS (dflow, d))
502 return TRUE;
503 }
504 else
505 {
506 if (REAL_VALUES_LESS (d, sfhigh)
507 && REAL_VALUES_LESS (sflow, d))
508 return TRUE;
509 }
510
511 return FALSE;
512 }
513
514 /* Return truth value if a memory operand fits in a single instruction
515 (ie, register + small offset). */
516
517 int
518 simple_memory_operand (op, mode)
519 rtx op;
520 enum machine_mode mode;
521 {
522 rtx addr, plus0, plus1;
523
524 /* Eliminate non-memory operations */
525 if (GET_CODE (op) != MEM)
526 return FALSE;
527
528 /* dword operations really put out 2 instructions, so eliminate them. */
529 if (GET_MODE_SIZE (GET_MODE (op)) > UNITS_PER_WORD)
530 return FALSE;
531
532 /* Decode the address now. */
533 addr = XEXP (op, 0);
534 switch (GET_CODE (addr))
535 {
536 default:
537 break;
538
539 case REG:
540 return TRUE;
541
542 case CONST_INT:
543 return SMALL_INT (op);
544
545 case PLUS:
546 plus0 = XEXP (addr, 0);
547 plus1 = XEXP (addr, 1);
548 if (GET_CODE (plus0) == REG
549 && GET_CODE (plus1) == CONST_INT
550 && SMALL_INT (plus1))
551 return TRUE;
552
553 else if (GET_CODE (plus1) == REG
554 && GET_CODE (plus0) == CONST_INT
555 && SMALL_INT (plus0))
556 return TRUE;
557
558 else
559 return FALSE;
560
561 #if 0
562 /* We used to allow small symbol refs here (ie, stuff in .sdata
563 or .sbss), but this causes some bugs in G++. Also, it won't
564 interfere if the MIPS linker rewrites the store instruction
565 because the function is PIC. */
566
567 case LABEL_REF: /* never gp relative */
568 break;
569
570 case CONST:
571 /* If -G 0, we can never have a GP relative memory operation.
572 Also, save some time if not optimizing. */
573 if (!TARGET_GP_OPT)
574 return FALSE;
575
576 {
577 rtx offset = const0_rtx;
578 addr = eliminate_constant_term (XEXP (addr, 0), &offset);
579 if (GET_CODE (op) != SYMBOL_REF)
580 return FALSE;
581
582 /* let's be paranoid.... */
583 if (! SMALL_INT (offset))
584 return FALSE;
585 }
586 /* fall through */
587
588 case SYMBOL_REF:
589 return SYMBOL_REF_FLAG (addr);
590 #endif
591 }
592
593 return FALSE;
594 }
595
596 /* Return true if the code of this rtx pattern is EQ or NE. */
597
598 int
599 equality_op (op, mode)
600 rtx op;
601 enum machine_mode mode;
602 {
603 if (mode != GET_MODE (op))
604 return FALSE;
605
606 return (GET_CODE (op) == EQ || GET_CODE (op) == NE);
607 }
608
609 /* Return true if the code is a relational operations (EQ, LE, etc.) */
610
611 int
612 cmp_op (op, mode)
613 rtx op;
614 enum machine_mode mode;
615 {
616 if (mode != GET_MODE (op))
617 return FALSE;
618
619 return (GET_RTX_CLASS (GET_CODE (op)) == '<');
620 }
621
622 /* Return true if the operand is either the PC or a label_ref. */
623
624 int
625 pc_or_label_operand (op, mode)
626 rtx op;
627 enum machine_mode mode;
628 {
629 if (op == pc_rtx)
630 return TRUE;
631
632 if (GET_CODE (op) == LABEL_REF)
633 return TRUE;
634
635 return FALSE;
636 }
637
638 /* Test for a valid operand for a call instruction.
639 Don't allow the arg pointer register or virtual regs
640 since they may change into reg + const, which the patterns
641 can't handle yet. */
642
643 int
644 call_insn_operand (op, mode)
645 rtx op;
646 enum machine_mode mode;
647 {
648 if (GET_CODE (op) == MEM
649 && (CONSTANT_ADDRESS_P (XEXP (op, 0))
650 || (GET_CODE (XEXP (op, 0)) == REG
651 && XEXP (op, 0) != arg_pointer_rtx
652 && !(REGNO (XEXP (op, 0)) >= FIRST_PSEUDO_REGISTER
653 && REGNO (XEXP (op, 0)) <= LAST_VIRTUAL_REGISTER))))
654 return 1;
655 return 0;
656 }
657 \f
658 /* Returns an operand string for the given instruction's delay slot,
659 after updating filled delay slot statistics.
660
661 We assume that operands[0] is the target register that is set.
662
663 In order to check the next insn, most of this functionality is moved
664 to FINAL_PRESCAN_INSN, and we just set the global variables that
665 it needs. */
666
667 /* ??? This function no longer does anything useful, because final_prescan_insn
668 now will never emit a nop. */
669
670 char *
671 mips_fill_delay_slot (ret, type, operands, cur_insn)
672 char *ret; /* normal string to return */
673 enum delay_type type; /* type of delay */
674 rtx operands[]; /* operands to use */
675 rtx cur_insn; /* current insn */
676 {
677 register rtx set_reg;
678 register enum machine_mode mode;
679 register rtx next_insn = (cur_insn) ? NEXT_INSN (cur_insn) : (rtx)0;
680 register int num_nops;
681
682 if (type == DELAY_LOAD || type == DELAY_FCMP)
683 num_nops = 1;
684
685 else if (type == DELAY_HILO)
686 num_nops = 2;
687
688 else
689 num_nops = 0;
690
691 /* Make sure that we don't put nop's after labels. */
692 next_insn = NEXT_INSN (cur_insn);
693 while (next_insn != (rtx)0 && GET_CODE (next_insn) == NOTE)
694 next_insn = NEXT_INSN (next_insn);
695
696 dslots_load_total += num_nops;
697 if (TARGET_DEBUG_F_MODE
698 || !optimize
699 || type == DELAY_NONE
700 || operands == (rtx *)0
701 || cur_insn == (rtx)0
702 || next_insn == (rtx)0
703 || GET_CODE (next_insn) == CODE_LABEL
704 || (set_reg = operands[0]) == (rtx)0)
705 {
706 dslots_number_nops = 0;
707 mips_load_reg = (rtx)0;
708 mips_load_reg2 = (rtx)0;
709 mips_load_reg3 = (rtx)0;
710 mips_load_reg4 = (rtx)0;
711 return ret;
712 }
713
714 set_reg = operands[0];
715 if (set_reg == (rtx)0)
716 return ret;
717
718 while (GET_CODE (set_reg) == SUBREG)
719 set_reg = SUBREG_REG (set_reg);
720
721 mode = GET_MODE (set_reg);
722 dslots_number_nops = num_nops;
723 mips_load_reg = set_reg;
724 if (GET_MODE_SIZE (mode)
725 > (FP_REG_P (set_reg) ? UNITS_PER_FPREG : UNITS_PER_WORD))
726 mips_load_reg2 = gen_rtx (REG, SImode, REGNO (set_reg) + 1);
727 else
728 mips_load_reg2 = 0;
729
730 if (type == DELAY_HILO)
731 {
732 mips_load_reg3 = gen_rtx (REG, SImode, MD_REG_FIRST);
733 mips_load_reg4 = gen_rtx (REG, SImode, MD_REG_FIRST+1);
734 }
735 else
736 {
737 mips_load_reg3 = 0;
738 mips_load_reg4 = 0;
739 }
740
741 return ret;
742 }
743
744 \f
745 /* Determine whether a memory reference takes one (based off of the GP pointer),
746 two (normal), or three (label + reg) instructions, and bump the appropriate
747 counter for -mstats. */
748
749 void
750 mips_count_memory_refs (op, num)
751 rtx op;
752 int num;
753 {
754 int additional = 0;
755 int n_words = 0;
756 rtx addr, plus0, plus1;
757 enum rtx_code code0, code1;
758 int looping;
759
760 if (TARGET_DEBUG_B_MODE)
761 {
762 fprintf (stderr, "\n========== mips_count_memory_refs:\n");
763 debug_rtx (op);
764 }
765
766 /* Skip MEM if passed, otherwise handle movsi of address. */
767 addr = (GET_CODE (op) != MEM) ? op : XEXP (op, 0);
768
769 /* Loop, going through the address RTL */
770 do
771 {
772 looping = FALSE;
773 switch (GET_CODE (addr))
774 {
775 default:
776 break;
777
778 case REG:
779 case CONST_INT:
780 break;
781
782 case PLUS:
783 plus0 = XEXP (addr, 0);
784 plus1 = XEXP (addr, 1);
785 code0 = GET_CODE (plus0);
786 code1 = GET_CODE (plus1);
787
788 if (code0 == REG)
789 {
790 additional++;
791 addr = plus1;
792 looping = TRUE;
793 continue;
794 }
795
796 if (code0 == CONST_INT)
797 {
798 addr = plus1;
799 looping = TRUE;
800 continue;
801 }
802
803 if (code1 == REG)
804 {
805 additional++;
806 addr = plus0;
807 looping = TRUE;
808 continue;
809 }
810
811 if (code1 == CONST_INT)
812 {
813 addr = plus0;
814 looping = TRUE;
815 continue;
816 }
817
818 if (code0 == SYMBOL_REF || code0 == LABEL_REF || code0 == CONST)
819 {
820 addr = plus0;
821 looping = TRUE;
822 continue;
823 }
824
825 if (code1 == SYMBOL_REF || code1 == LABEL_REF || code1 == CONST)
826 {
827 addr = plus1;
828 looping = TRUE;
829 continue;
830 }
831
832 break;
833
834 case LABEL_REF:
835 n_words = 2; /* always 2 words */
836 break;
837
838 case CONST:
839 addr = XEXP (addr, 0);
840 looping = TRUE;
841 continue;
842
843 case SYMBOL_REF:
844 n_words = SYMBOL_REF_FLAG (addr) ? 1 : 2;
845 break;
846 }
847 }
848 while (looping);
849
850 if (n_words == 0)
851 return;
852
853 n_words += additional;
854 if (n_words > 3)
855 n_words = 3;
856
857 num_refs[n_words-1] += num;
858 }
859
860 \f
861 /* Return RTL for the offset from the current function to the
862 argument. */
863
864 rtx
865 embedded_pic_offset (x)
866 rtx x;
867 {
868 if (embedded_pic_fnaddr_rtx == NULL)
869 embedded_pic_fnaddr_rtx = gen_reg_rtx (Pmode);
870 return gen_rtx (CONST, Pmode,
871 gen_rtx (MINUS, Pmode, x,
872 XEXP (DECL_RTL (current_function_decl), 0)));
873 }
874
875 /* Return the appropriate instructions to move one operand to another. */
876
877 char *
878 mips_move_1word (operands, insn, unsignedp)
879 rtx operands[];
880 rtx insn;
881 int unsignedp;
882 {
883 char *ret = 0;
884 rtx op0 = operands[0];
885 rtx op1 = operands[1];
886 enum rtx_code code0 = GET_CODE (op0);
887 enum rtx_code code1 = GET_CODE (op1);
888 enum machine_mode mode = GET_MODE (op0);
889 int subreg_word0 = 0;
890 int subreg_word1 = 0;
891 enum delay_type delay = DELAY_NONE;
892
893 while (code0 == SUBREG)
894 {
895 subreg_word0 += SUBREG_WORD (op0);
896 op0 = SUBREG_REG (op0);
897 code0 = GET_CODE (op0);
898 }
899
900 while (code1 == SUBREG)
901 {
902 subreg_word1 += SUBREG_WORD (op1);
903 op1 = SUBREG_REG (op1);
904 code1 = GET_CODE (op1);
905 }
906
907 if (code0 == REG)
908 {
909 int regno0 = REGNO (op0) + subreg_word0;
910
911 if (code1 == REG)
912 {
913 int regno1 = REGNO (op1) + subreg_word1;
914
915 /* Just in case, don't do anything for assigning a register
916 to itself, unless we are filling a delay slot. */
917 if (regno0 == regno1 && set_nomacro == 0)
918 ret = "";
919
920 else if (GP_REG_P (regno0))
921 {
922 if (GP_REG_P (regno1))
923 ret = "move\t%0,%1";
924
925 else if (MD_REG_P (regno1))
926 {
927 delay = DELAY_HILO;
928 ret = "mf%1\t%0";
929 }
930
931 else
932 {
933 delay = DELAY_LOAD;
934 if (FP_REG_P (regno1))
935 ret = "mfc1\t%0,%1";
936
937 else if (regno1 == FPSW_REGNUM)
938 ret = "cfc1\t%0,$31";
939 }
940 }
941
942 else if (FP_REG_P (regno0))
943 {
944 if (GP_REG_P (regno1))
945 {
946 delay = DELAY_LOAD;
947 ret = "mtc1\t%1,%0";
948 }
949
950 if (FP_REG_P (regno1))
951 ret = "mov.s\t%0,%1";
952 }
953
954 else if (MD_REG_P (regno0))
955 {
956 if (GP_REG_P (regno1))
957 {
958 delay = DELAY_HILO;
959 ret = "mt%0\t%1";
960 }
961 }
962
963 else if (regno0 == FPSW_REGNUM)
964 {
965 if (GP_REG_P (regno1))
966 {
967 delay = DELAY_LOAD;
968 ret = "ctc1\t%0,$31";
969 }
970 }
971 }
972
973 else if (code1 == MEM)
974 {
975 delay = DELAY_LOAD;
976
977 if (TARGET_STATS)
978 mips_count_memory_refs (op1, 1);
979
980 if (GP_REG_P (regno0))
981 {
982 /* For loads, use the mode of the memory item, instead of the
983 target, so zero/sign extend can use this code as well. */
984 switch (GET_MODE (op1))
985 {
986 default:
987 break;
988 case SFmode:
989 ret = "lw\t%0,%1";
990 break;
991 case SImode:
992 ret = ((unsignedp && TARGET_64BIT)
993 ? "lwu\t%0,%1"
994 : "lw\t%0,%1");
995 break;
996 case HImode:
997 ret = (unsignedp) ? "lhu\t%0,%1" : "lh\t%0,%1";
998 break;
999 case QImode:
1000 ret = (unsignedp) ? "lbu\t%0,%1" : "lb\t%0,%1";
1001 break;
1002 }
1003 }
1004
1005 else if (FP_REG_P (regno0) && (mode == SImode || mode == SFmode))
1006 ret = "l.s\t%0,%1";
1007
1008 if (ret != (char *)0 && MEM_VOLATILE_P (op1))
1009 {
1010 int i = strlen (ret);
1011 if (i > sizeof (volatile_buffer) - sizeof ("%{%}"))
1012 abort ();
1013
1014 sprintf (volatile_buffer, "%%{%s%%}", ret);
1015 ret = volatile_buffer;
1016 }
1017 }
1018
1019 else if (code1 == CONST_INT
1020 || (code1 == CONST_DOUBLE
1021 && GET_MODE (op1) == VOIDmode))
1022 {
1023 if (code1 == CONST_DOUBLE)
1024 {
1025 /* This can happen when storing constants into long long
1026 bitfields. Just store the least significant word of
1027 the value. */
1028 operands[1] = op1 = GEN_INT (CONST_DOUBLE_LOW (op1));
1029 }
1030
1031 if (INTVAL (op1) == 0)
1032 {
1033 if (GP_REG_P (regno0))
1034 ret = "move\t%0,%z1";
1035
1036 else if (FP_REG_P (regno0))
1037 {
1038 delay = DELAY_LOAD;
1039 ret = "mtc1\t%z1,%0";
1040 }
1041 }
1042
1043 else if (GP_REG_P (regno0))
1044 ret = (INTVAL (op1) < 0) ? "li\t%0,%1\t\t\t# %X1" : "li\t%0,%X1\t\t# %1";
1045 }
1046
1047 else if (code1 == CONST_DOUBLE && mode == SFmode)
1048 {
1049 if (op1 == CONST0_RTX (SFmode))
1050 {
1051 if (GP_REG_P (regno0))
1052 ret = "move\t%0,%.";
1053
1054 else if (FP_REG_P (regno0))
1055 {
1056 delay = DELAY_LOAD;
1057 ret = "mtc1\t%.,%0";
1058 }
1059 }
1060
1061 else
1062 {
1063 delay = DELAY_LOAD;
1064 ret = "li.s\t%0,%1";
1065 }
1066 }
1067
1068 else if (code1 == LABEL_REF)
1069 {
1070 if (TARGET_STATS)
1071 mips_count_memory_refs (op1, 1);
1072
1073 ret = "la\t%0,%a1";
1074 }
1075
1076 else if (code1 == SYMBOL_REF || code1 == CONST)
1077 {
1078 if (HALF_PIC_P () && CONSTANT_P (op1) && HALF_PIC_ADDRESS_P (op1))
1079 {
1080 rtx offset = const0_rtx;
1081
1082 if (GET_CODE (op1) == CONST)
1083 op1 = eliminate_constant_term (XEXP (op1, 0), &offset);
1084
1085 if (GET_CODE (op1) == SYMBOL_REF)
1086 {
1087 operands[2] = HALF_PIC_PTR (op1);
1088
1089 if (TARGET_STATS)
1090 mips_count_memory_refs (operands[2], 1);
1091
1092 if (INTVAL (offset) == 0)
1093 {
1094 delay = DELAY_LOAD;
1095 ret = (unsignedp && TARGET_64BIT
1096 ? "lwu\t%0,%2"
1097 : "lw\t%0,%2");
1098 }
1099 else
1100 {
1101 dslots_load_total++;
1102 operands[3] = offset;
1103 if (unsignedp && TARGET_64BIT)
1104 ret = (SMALL_INT (offset))
1105 ? "lwu\t%0,%2%#\n\tadd\t%0,%0,%3"
1106 : "lwu\t%0,%2%#\n\t%[li\t%@,%3\n\tadd\t%0,%0,%@%]";
1107 else
1108 ret = (SMALL_INT (offset))
1109 ? "lw\t%0,%2%#\n\tadd\t%0,%0,%3"
1110 : "lw\t%0,%2%#\n\t%[li\t%@,%3\n\tadd\t%0,%0,%@%]";
1111 }
1112 }
1113 }
1114 else
1115 {
1116 if (TARGET_STATS)
1117 mips_count_memory_refs (op1, 1);
1118
1119 ret = "la\t%0,%a1";
1120 }
1121 }
1122
1123 else if (code1 == PLUS)
1124 {
1125 rtx add_op0 = XEXP (op1, 0);
1126 rtx add_op1 = XEXP (op1, 1);
1127
1128 if (GET_CODE (XEXP (op1, 1)) == REG && GET_CODE (XEXP (op1, 0)) == CONST_INT)
1129 {
1130 add_op0 = XEXP (op1, 1); /* reverse operands */
1131 add_op1 = XEXP (op1, 0);
1132 }
1133
1134 operands[2] = add_op0;
1135 operands[3] = add_op1;
1136 ret = "add%:\t%0,%2,%3";
1137 }
1138 }
1139
1140 else if (code0 == MEM)
1141 {
1142 if (TARGET_STATS)
1143 mips_count_memory_refs (op0, 1);
1144
1145 if (code1 == REG)
1146 {
1147 int regno1 = REGNO (op1) + subreg_word1;
1148
1149 if (GP_REG_P (regno1))
1150 {
1151 switch (mode)
1152 {
1153 default: break;
1154 case SFmode: ret = "sw\t%1,%0"; break;
1155 case SImode: ret = "sw\t%1,%0"; break;
1156 case HImode: ret = "sh\t%1,%0"; break;
1157 case QImode: ret = "sb\t%1,%0"; break;
1158 }
1159 }
1160
1161 else if (FP_REG_P (regno1) && (mode == SImode || mode == SFmode))
1162 ret = "s.s\t%1,%0";
1163 }
1164
1165 else if (code1 == CONST_INT && INTVAL (op1) == 0)
1166 {
1167 switch (mode)
1168 {
1169 default: break;
1170 case SFmode: ret = "sw\t%z1,%0"; break;
1171 case SImode: ret = "sw\t%z1,%0"; break;
1172 case HImode: ret = "sh\t%z1,%0"; break;
1173 case QImode: ret = "sb\t%z1,%0"; break;
1174 }
1175 }
1176
1177 else if (code1 == CONST_DOUBLE && op1 == CONST0_RTX (mode))
1178 {
1179 switch (mode)
1180 {
1181 default: break;
1182 case SFmode: ret = "sw\t%.,%0"; break;
1183 case SImode: ret = "sw\t%.,%0"; break;
1184 case HImode: ret = "sh\t%.,%0"; break;
1185 case QImode: ret = "sb\t%.,%0"; break;
1186 }
1187 }
1188
1189 if (ret != (char *)0 && MEM_VOLATILE_P (op0))
1190 {
1191 int i = strlen (ret);
1192 if (i > sizeof (volatile_buffer) - sizeof ("%{%}"))
1193 abort ();
1194
1195 sprintf (volatile_buffer, "%%{%s%%}", ret);
1196 ret = volatile_buffer;
1197 }
1198 }
1199
1200 if (ret == (char *)0)
1201 {
1202 abort_with_insn (insn, "Bad move");
1203 return 0;
1204 }
1205
1206 if (delay != DELAY_NONE)
1207 return mips_fill_delay_slot (ret, delay, operands, insn);
1208
1209 return ret;
1210 }
1211
1212 \f
1213 /* Return the appropriate instructions to move 2 words */
1214
1215 char *
1216 mips_move_2words (operands, insn)
1217 rtx operands[];
1218 rtx insn;
1219 {
1220 char *ret = 0;
1221 rtx op0 = operands[0];
1222 rtx op1 = operands[1];
1223 enum rtx_code code0 = GET_CODE (operands[0]);
1224 enum rtx_code code1 = GET_CODE (operands[1]);
1225 int subreg_word0 = 0;
1226 int subreg_word1 = 0;
1227 enum delay_type delay = DELAY_NONE;
1228
1229 while (code0 == SUBREG)
1230 {
1231 subreg_word0 += SUBREG_WORD (op0);
1232 op0 = SUBREG_REG (op0);
1233 code0 = GET_CODE (op0);
1234 }
1235
1236 while (code1 == SUBREG)
1237 {
1238 subreg_word1 += SUBREG_WORD (op1);
1239 op1 = SUBREG_REG (op1);
1240 code1 = GET_CODE (op1);
1241 }
1242
1243 if (code0 == REG)
1244 {
1245 int regno0 = REGNO (op0) + subreg_word0;
1246
1247 if (code1 == REG)
1248 {
1249 int regno1 = REGNO (op1) + subreg_word1;
1250
1251 /* Just in case, don't do anything for assigning a register
1252 to itself, unless we are filling a delay slot. */
1253 if (regno0 == regno1 && set_nomacro == 0)
1254 ret = "";
1255
1256 else if (FP_REG_P (regno0))
1257 {
1258 if (FP_REG_P (regno1))
1259 ret = "mov.d\t%0,%1";
1260
1261 else
1262 {
1263 delay = DELAY_LOAD;
1264 if (TARGET_FLOAT64)
1265 {
1266 if (!TARGET_64BIT)
1267 abort_with_insn (insn, "Bad move");
1268 #ifdef TARGET_FP_CALL_32
1269 if (FP_CALL_GP_REG_P (regno1))
1270 ret = "dsll\t%1,32\n\tor\t%1,%D1\n\tdmtc1\t%1,%0";
1271 else
1272 #endif
1273 ret = "dmtc1\t%1,%0";
1274 }
1275 else
1276 ret = "mtc1\t%L1,%0\n\tmtc1\t%M1,%D0";
1277 }
1278 }
1279
1280 else if (FP_REG_P (regno1))
1281 {
1282 delay = DELAY_LOAD;
1283 if (TARGET_FLOAT64)
1284 {
1285 if (!TARGET_64BIT)
1286 abort_with_insn (insn, "Bad move");
1287 #ifdef TARGET_FP_CALL_32
1288 if (FP_CALL_GP_REG_P (regno0))
1289 ret = "dmfc1\t%0,%1\n\tmfc1\t%D0,%1\n\tdsrl\t%0,32";
1290 else
1291 #endif
1292 ret = "dmfc1\t%0,%1";
1293 }
1294 else
1295 ret = "mfc1\t%L0,%1\n\tmfc1\t%M0,%D1";
1296 }
1297
1298 else if (MD_REG_P (regno0) && GP_REG_P (regno1))
1299 {
1300 delay = DELAY_HILO;
1301 if (TARGET_64BIT)
1302 ret = "mt%0\t%1";
1303 else
1304 ret = "mthi\t%M1\n\tmtlo\t%L1";
1305 }
1306
1307 else if (GP_REG_P (regno0) && MD_REG_P (regno1))
1308 {
1309 delay = DELAY_HILO;
1310 if (TARGET_64BIT)
1311 ret = "mf%1\t%0";
1312 else
1313 ret = "mfhi\t%M0\n\tmflo\t%L0";
1314 }
1315
1316 else if (TARGET_64BIT)
1317 ret = "move\t%0,%1";
1318
1319 else if (regno0 != (regno1+1))
1320 ret = "move\t%0,%1\n\tmove\t%D0,%D1";
1321
1322 else
1323 ret = "move\t%D0,%D1\n\tmove\t%0,%1";
1324 }
1325
1326 else if (code1 == CONST_DOUBLE)
1327 {
1328 /* Move zero from $0 unless !TARGET_64BIT and recipient
1329 is 64-bit fp reg, in which case generate a constant. */
1330 if (op1 != CONST0_RTX (GET_MODE (op1))
1331 || (TARGET_FLOAT64 && !TARGET_64BIT && FP_REG_P (regno0)))
1332 {
1333 if (GET_MODE (op1) == DFmode)
1334 {
1335 delay = DELAY_LOAD;
1336 #ifdef TARGET_FP_CALL_32
1337 if (FP_CALL_GP_REG_P (regno0))
1338 {
1339 if (TARGET_FLOAT64 && !TARGET_64BIT)
1340 {
1341 split_double (op1, operands + 2, operands + 3);
1342 ret = "li\t%0,%2\n\tli\t%D0,%3";
1343 }
1344 else
1345 ret = "li.d\t%0,%1\n\tdsll\t%D0,%0,32\n\tdsrl\t%D0,32\n\tdsrl\t%0,32";
1346 }
1347 else
1348 #endif
1349 ret = "li.d\t%0,%1";
1350 }
1351
1352 else if (TARGET_FLOAT64)
1353 ret = "li\t%0,%1";
1354
1355 else
1356 {
1357 split_double (op1, operands + 2, operands + 3);
1358 ret = "li\t%0,%2\n\tli\t%D0,%3";
1359 }
1360 }
1361
1362 else
1363 {
1364 if (GP_REG_P (regno0))
1365 ret = (TARGET_64BIT
1366 #ifdef TARGET_FP_CALL_32
1367 && ! FP_CALL_GP_REG_P (regno0)
1368 #endif
1369 )
1370 ? "move\t%0,%."
1371 : "move\t%0,%.\n\tmove\t%D0,%.";
1372
1373 else if (FP_REG_P (regno0))
1374 {
1375 delay = DELAY_LOAD;
1376 ret = (TARGET_64BIT)
1377 ? "dmtc1\t%.,%0"
1378 : "mtc1\t%.,%0\n\tmtc1\t%.,%D0";
1379 }
1380 }
1381 }
1382
1383 else if (code1 == CONST_INT && INTVAL (op1) == 0)
1384 {
1385 if (GP_REG_P (regno0))
1386 ret = (TARGET_64BIT)
1387 ? "move\t%0,%."
1388 : "move\t%0,%.\n\tmove\t%D0,%.";
1389
1390 else if (FP_REG_P (regno0))
1391 {
1392 delay = DELAY_LOAD;
1393 ret = (TARGET_64BIT)
1394 ? "dmtc1\t%.,%0"
1395 : (TARGET_FLOAT64
1396 ? "li.d\t%0,%1"
1397 : "mtc1\t%.,%0\n\tmtc1\t%.,%D0");
1398 }
1399 }
1400
1401 else if (code1 == CONST_INT && GET_MODE (op0) == DImode && GP_REG_P (regno0))
1402 {
1403 if (TARGET_64BIT)
1404 ret = "li\t%0,%1";
1405 else
1406 {
1407 operands[2] = GEN_INT (INTVAL (operands[1]) >= 0 ? 0 : -1);
1408 ret = "li\t%M0,%2\n\tli\t%L0,%1";
1409 }
1410 }
1411
1412 else if (code1 == MEM)
1413 {
1414 delay = DELAY_LOAD;
1415
1416 if (TARGET_STATS)
1417 mips_count_memory_refs (op1, 2);
1418
1419 if (FP_REG_P (regno0))
1420 ret = "l.d\t%0,%1";
1421
1422 else if (TARGET_64BIT)
1423 {
1424 #ifdef TARGET_FP_CALL_32
1425 if (FP_CALL_GP_REG_P (regno0))
1426 {
1427 if (offsettable_address_p (FALSE, SImode, op1))
1428 ret = "lwu\t%0,%1\n\tlwu\t%D0,4+%1";
1429 else
1430 ret = "ld\t%0,%1\n\tdsll\t%D0,%0,32\n\tdsrl\t%D0,32\n\tdsrl\t%0,32";
1431 }
1432 else
1433 #endif
1434 ret = "ld\t%0,%1";
1435 }
1436
1437 else if (offsettable_address_p (1, DFmode, XEXP (op1, 0)))
1438 {
1439 operands[2] = adj_offsettable_operand (op1, 4);
1440 if (reg_mentioned_p (op0, op1))
1441 ret = "lw\t%D0,%2\n\tlw\t%0,%1";
1442 else
1443 ret = "lw\t%0,%1\n\tlw\t%D0,%2";
1444 }
1445
1446 if (ret != (char *)0 && MEM_VOLATILE_P (op1))
1447 {
1448 int i = strlen (ret);
1449 if (i > sizeof (volatile_buffer) - sizeof ("%{%}"))
1450 abort ();
1451
1452 sprintf (volatile_buffer, "%%{%s%%}", ret);
1453 ret = volatile_buffer;
1454 }
1455 }
1456
1457 else if (code1 == LABEL_REF
1458 || code1 == SYMBOL_REF
1459 || code1 == CONST)
1460 {
1461 if (! TARGET_64BIT)
1462 abort ();
1463 return mips_move_1word (operands, insn, 0);
1464 }
1465 }
1466
1467 else if (code0 == MEM)
1468 {
1469 if (code1 == REG)
1470 {
1471 int regno1 = REGNO (op1) + subreg_word1;
1472
1473 if (FP_REG_P (regno1))
1474 ret = "s.d\t%1,%0";
1475
1476 else if (TARGET_64BIT)
1477 {
1478 #ifdef TARGET_FP_CALL_32
1479 if (FP_CALL_GP_REG_P (regno1))
1480 ret = "dsll\t%1,32\n\tor\t%1,%D1\n\tsd\t%1,%0";
1481 else
1482 #endif
1483 ret = "sd\t%1,%0";
1484 }
1485
1486 else if (offsettable_address_p (1, DFmode, XEXP (op0, 0)))
1487 {
1488 operands[2] = adj_offsettable_operand (op0, 4);
1489 ret = "sw\t%1,%0\n\tsw\t%D1,%2";
1490 }
1491 }
1492
1493 else if (((code1 == CONST_INT && INTVAL (op1) == 0)
1494 || (code1 == CONST_DOUBLE
1495 && op1 == CONST0_RTX (GET_MODE (op1))))
1496 && (TARGET_64BIT
1497 || offsettable_address_p (1, DFmode, XEXP (op0, 0))))
1498 {
1499 if (TARGET_64BIT)
1500 ret = "sd\t%.,%0";
1501 else
1502 {
1503 operands[2] = adj_offsettable_operand (op0, 4);
1504 ret = "sw\t%.,%0\n\tsw\t%.,%2";
1505 }
1506 }
1507
1508 if (TARGET_STATS)
1509 mips_count_memory_refs (op0, 2);
1510
1511 if (ret != (char *)0 && MEM_VOLATILE_P (op0))
1512 {
1513 int i = strlen (ret);
1514 if (i > sizeof (volatile_buffer) - sizeof ("%{%}"))
1515 abort ();
1516
1517 sprintf (volatile_buffer, "%%{%s%%}", ret);
1518 ret = volatile_buffer;
1519 }
1520 }
1521
1522 if (ret == (char *)0)
1523 {
1524 abort_with_insn (insn, "Bad move");
1525 return 0;
1526 }
1527
1528 if (delay != DELAY_NONE)
1529 return mips_fill_delay_slot (ret, delay, operands, insn);
1530
1531 return ret;
1532 }
1533
1534 \f
1535 /* Provide the costs of an addressing mode that contains ADDR.
1536 If ADDR is not a valid address, its cost is irrelevant. */
1537
1538 int
1539 mips_address_cost (addr)
1540 rtx addr;
1541 {
1542 switch (GET_CODE (addr))
1543 {
1544 default:
1545 break;
1546
1547 case LO_SUM:
1548 case HIGH:
1549 return 1;
1550
1551 case LABEL_REF:
1552 return 2;
1553
1554 case CONST:
1555 {
1556 rtx offset = const0_rtx;
1557 addr = eliminate_constant_term (XEXP (addr, 0), &offset);
1558 if (GET_CODE (addr) == LABEL_REF)
1559 return 2;
1560
1561 if (GET_CODE (addr) != SYMBOL_REF)
1562 return 4;
1563
1564 if (! SMALL_INT (offset))
1565 return 2;
1566 }
1567 /* fall through */
1568
1569 case SYMBOL_REF:
1570 return SYMBOL_REF_FLAG (addr) ? 1 : 2;
1571
1572 case PLUS:
1573 {
1574 register rtx plus0 = XEXP (addr, 0);
1575 register rtx plus1 = XEXP (addr, 1);
1576
1577 if (GET_CODE (plus0) != REG && GET_CODE (plus1) == REG)
1578 {
1579 plus0 = XEXP (addr, 1);
1580 plus1 = XEXP (addr, 0);
1581 }
1582
1583 if (GET_CODE (plus0) != REG)
1584 break;
1585
1586 switch (GET_CODE (plus1))
1587 {
1588 default:
1589 break;
1590
1591 case CONST_INT:
1592 return (SMALL_INT (plus1) ? 1 : 2);
1593
1594 case CONST:
1595 case SYMBOL_REF:
1596 case LABEL_REF:
1597 case HIGH:
1598 case LO_SUM:
1599 return mips_address_cost (plus1) + 1;
1600 }
1601 }
1602 }
1603
1604 return 4;
1605 }
1606
1607 /* Return true if X is an address which needs a temporary register when
1608 reloaded while generating PIC code. */
1609
1610 int
1611 pic_address_needs_scratch (x)
1612 rtx x;
1613 {
1614 /* An address which is a symbolic plus a non SMALL_INT needs a temp reg. */
1615 if (GET_CODE (x) == CONST && GET_CODE (XEXP (x, 0)) == PLUS
1616 && GET_CODE (XEXP (XEXP (x, 0), 0)) == SYMBOL_REF
1617 && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT
1618 && ! SMALL_INT (XEXP (XEXP (x, 0), 1)))
1619 return 1;
1620
1621 return 0;
1622 }
1623 \f
1624 /* Make normal rtx_code into something we can index from an array */
1625
1626 static enum internal_test
1627 map_test_to_internal_test (test_code)
1628 enum rtx_code test_code;
1629 {
1630 enum internal_test test = ITEST_MAX;
1631
1632 switch (test_code)
1633 {
1634 default: break;
1635 case EQ: test = ITEST_EQ; break;
1636 case NE: test = ITEST_NE; break;
1637 case GT: test = ITEST_GT; break;
1638 case GE: test = ITEST_GE; break;
1639 case LT: test = ITEST_LT; break;
1640 case LE: test = ITEST_LE; break;
1641 case GTU: test = ITEST_GTU; break;
1642 case GEU: test = ITEST_GEU; break;
1643 case LTU: test = ITEST_LTU; break;
1644 case LEU: test = ITEST_LEU; break;
1645 }
1646
1647 return test;
1648 }
1649
1650 \f
1651 /* Generate the code to compare two integer values. The return value is:
1652 (reg:SI xx) The pseudo register the comparison is in
1653 (rtx)0 No register, generate a simple branch.
1654
1655 ??? This is called with result nonzero by the Scond patterns in
1656 mips.md. These patterns are called with a target in the mode of
1657 the Scond instruction pattern. Since this must be a constant, we
1658 must use SImode. This means that if RESULT is non-zero, it will
1659 always be an SImode register, even if TARGET_64BIT is true. We
1660 cope with this by calling convert_move rather than emit_move_insn.
1661 This will sometimes lead to an unnecessary extension of the result;
1662 for example:
1663
1664 long long
1665 foo (long long i)
1666 {
1667 return i < 5;
1668 }
1669
1670 */
1671
1672 rtx
1673 gen_int_relational (test_code, result, cmp0, cmp1, p_invert)
1674 enum rtx_code test_code; /* relational test (EQ, etc) */
1675 rtx result; /* result to store comp. or 0 if branch */
1676 rtx cmp0; /* first operand to compare */
1677 rtx cmp1; /* second operand to compare */
1678 int *p_invert; /* NULL or ptr to hold whether branch needs */
1679 /* to reverse its test */
1680 {
1681 struct cmp_info {
1682 enum rtx_code test_code; /* code to use in instruction (LT vs. LTU) */
1683 int const_low; /* low bound of constant we can accept */
1684 int const_high; /* high bound of constant we can accept */
1685 int const_add; /* constant to add (convert LE -> LT) */
1686 int reverse_regs; /* reverse registers in test */
1687 int invert_const; /* != 0 if invert value if cmp1 is constant */
1688 int invert_reg; /* != 0 if invert value if cmp1 is register */
1689 int unsignedp; /* != 0 for unsigned comparisons. */
1690 };
1691
1692 static struct cmp_info info[ (int)ITEST_MAX ] = {
1693
1694 { XOR, 0, 65535, 0, 0, 0, 0, 0 }, /* EQ */
1695 { XOR, 0, 65535, 0, 0, 1, 1, 0 }, /* NE */
1696 { LT, -32769, 32766, 1, 1, 1, 0, 0 }, /* GT */
1697 { LT, -32768, 32767, 0, 0, 1, 1, 0 }, /* GE */
1698 { LT, -32768, 32767, 0, 0, 0, 0, 0 }, /* LT */
1699 { LT, -32769, 32766, 1, 1, 0, 1, 0 }, /* LE */
1700 { LTU, -32769, 32766, 1, 1, 1, 0, 1 }, /* GTU */
1701 { LTU, -32768, 32767, 0, 0, 1, 1, 1 }, /* GEU */
1702 { LTU, -32768, 32767, 0, 0, 0, 0, 1 }, /* LTU */
1703 { LTU, -32769, 32766, 1, 1, 0, 1, 1 }, /* LEU */
1704 };
1705
1706 enum internal_test test;
1707 enum machine_mode mode;
1708 struct cmp_info *p_info;
1709 int branch_p;
1710 int eqne_p;
1711 int invert;
1712 rtx reg;
1713 rtx reg2;
1714
1715 test = map_test_to_internal_test (test_code);
1716 if (test == ITEST_MAX)
1717 abort ();
1718
1719 p_info = &info[ (int)test ];
1720 eqne_p = (p_info->test_code == XOR);
1721
1722 mode = GET_MODE (cmp0);
1723 if (mode == VOIDmode)
1724 mode = GET_MODE (cmp1);
1725
1726 /* Eliminate simple branches */
1727 branch_p = (result == (rtx)0);
1728 if (branch_p)
1729 {
1730 if (GET_CODE (cmp0) == REG || GET_CODE (cmp0) == SUBREG)
1731 {
1732 /* Comparisons against zero are simple branches */
1733 if (GET_CODE (cmp1) == CONST_INT && INTVAL (cmp1) == 0)
1734 return (rtx)0;
1735
1736 /* Test for beq/bne. */
1737 if (eqne_p)
1738 return (rtx)0;
1739 }
1740
1741 /* allocate a pseudo to calculate the value in. */
1742 result = gen_reg_rtx (mode);
1743 }
1744
1745 /* Make sure we can handle any constants given to us. */
1746 if (GET_CODE (cmp0) == CONST_INT)
1747 cmp0 = force_reg (mode, cmp0);
1748
1749 if (GET_CODE (cmp1) == CONST_INT)
1750 {
1751 HOST_WIDE_INT value = INTVAL (cmp1);
1752 if (value < p_info->const_low
1753 || value > p_info->const_high
1754 /* ??? Why? And why wasn't the similar code below modified too? */
1755 || (TARGET_64BIT
1756 && HOST_BITS_PER_WIDE_INT < 64
1757 && p_info->const_add != 0
1758 && ((p_info->unsignedp
1759 ? ((unsigned HOST_WIDE_INT) (value + p_info->const_add)
1760 > INTVAL (cmp1))
1761 : (value + p_info->const_add) > INTVAL (cmp1))
1762 != (p_info->const_add > 0))))
1763 cmp1 = force_reg (mode, cmp1);
1764 }
1765
1766 /* See if we need to invert the result. */
1767 invert = (GET_CODE (cmp1) == CONST_INT)
1768 ? p_info->invert_const
1769 : p_info->invert_reg;
1770
1771 if (p_invert != (int *)0)
1772 {
1773 *p_invert = invert;
1774 invert = FALSE;
1775 }
1776
1777 /* Comparison to constants, may involve adding 1 to change a LT into LE.
1778 Comparison between two registers, may involve switching operands. */
1779 if (GET_CODE (cmp1) == CONST_INT)
1780 {
1781 if (p_info->const_add != 0)
1782 {
1783 HOST_WIDE_INT new = INTVAL (cmp1) + p_info->const_add;
1784 /* If modification of cmp1 caused overflow,
1785 we would get the wrong answer if we follow the usual path;
1786 thus, x > 0xffffffffu would turn into x > 0u. */
1787 if ((p_info->unsignedp
1788 ? (unsigned HOST_WIDE_INT) new > INTVAL (cmp1)
1789 : new > INTVAL (cmp1))
1790 != (p_info->const_add > 0))
1791 {
1792 /* This test is always true, but if INVERT is true then
1793 the result of the test needs to be inverted so 0 should
1794 be returned instead. */
1795 emit_move_insn (result, invert ? const0_rtx : const_true_rtx);
1796 return result;
1797 }
1798 else
1799 cmp1 = GEN_INT (new);
1800 }
1801 }
1802 else if (p_info->reverse_regs)
1803 {
1804 rtx temp = cmp0;
1805 cmp0 = cmp1;
1806 cmp1 = temp;
1807 }
1808
1809 if (test == ITEST_NE && GET_CODE (cmp1) == CONST_INT && INTVAL (cmp1) == 0)
1810 reg = cmp0;
1811 else
1812 {
1813 reg = (invert || eqne_p) ? gen_reg_rtx (mode) : result;
1814 convert_move (reg, gen_rtx (p_info->test_code, mode, cmp0, cmp1), 0);
1815 }
1816
1817 if (test == ITEST_NE)
1818 {
1819 convert_move (result, gen_rtx (GTU, mode, reg, const0_rtx), 0);
1820 invert = FALSE;
1821 }
1822
1823 else if (test == ITEST_EQ)
1824 {
1825 reg2 = (invert) ? gen_reg_rtx (mode) : result;
1826 convert_move (reg2, gen_rtx (LTU, mode, reg, const1_rtx), 0);
1827 reg = reg2;
1828 }
1829
1830 if (invert)
1831 convert_move (result, gen_rtx (XOR, mode, reg, const1_rtx), 0);
1832
1833 return result;
1834 }
1835
1836 \f
1837 /* Emit the common code for doing conditional branches.
1838 operand[0] is the label to jump to.
1839 The comparison operands are saved away by cmp{si,di,sf,df}. */
1840
1841 void
1842 gen_conditional_branch (operands, test_code)
1843 rtx operands[];
1844 enum rtx_code test_code;
1845 {
1846 static enum machine_mode mode_map[(int)CMP_MAX][(int)ITEST_MAX] = {
1847 { /* CMP_SI */
1848 SImode, /* eq */
1849 SImode, /* ne */
1850 SImode, /* gt */
1851 SImode, /* ge */
1852 SImode, /* lt */
1853 SImode, /* le */
1854 SImode, /* gtu */
1855 SImode, /* geu */
1856 SImode, /* ltu */
1857 SImode, /* leu */
1858 },
1859 { /* CMP_DI */
1860 DImode, /* eq */
1861 DImode, /* ne */
1862 DImode, /* gt */
1863 DImode, /* ge */
1864 DImode, /* lt */
1865 DImode, /* le */
1866 DImode, /* gtu */
1867 DImode, /* geu */
1868 DImode, /* ltu */
1869 DImode, /* leu */
1870 },
1871 { /* CMP_SF */
1872 CC_FPmode, /* eq */
1873 CC_REV_FPmode, /* ne */
1874 CC_FPmode, /* gt */
1875 CC_FPmode, /* ge */
1876 CC_FPmode, /* lt */
1877 CC_FPmode, /* le */
1878 VOIDmode, /* gtu */
1879 VOIDmode, /* geu */
1880 VOIDmode, /* ltu */
1881 VOIDmode, /* leu */
1882 },
1883 { /* CMP_DF */
1884 CC_FPmode, /* eq */
1885 CC_REV_FPmode, /* ne */
1886 CC_FPmode, /* gt */
1887 CC_FPmode, /* ge */
1888 CC_FPmode, /* lt */
1889 CC_FPmode, /* le */
1890 VOIDmode, /* gtu */
1891 VOIDmode, /* geu */
1892 VOIDmode, /* ltu */
1893 VOIDmode, /* leu */
1894 },
1895 };
1896
1897 enum machine_mode mode;
1898 enum cmp_type type = branch_type;
1899 rtx cmp0 = branch_cmp[0];
1900 rtx cmp1 = branch_cmp[1];
1901 rtx label1 = gen_rtx (LABEL_REF, VOIDmode, operands[0]);
1902 rtx label2 = pc_rtx;
1903 rtx reg = (rtx)0;
1904 int invert = 0;
1905 enum internal_test test = map_test_to_internal_test (test_code);
1906
1907 if (test == ITEST_MAX)
1908 {
1909 mode = word_mode;
1910 goto fail;
1911 }
1912
1913 /* Get the machine mode to use (CCmode, CC_EQmode, CC_FPmode, or CC_REV_FPmode). */
1914 mode = mode_map[(int)type][(int)test];
1915 if (mode == VOIDmode)
1916 goto fail;
1917
1918 switch (type)
1919 {
1920 default:
1921 goto fail;
1922
1923 case CMP_SI:
1924 case CMP_DI:
1925 reg = gen_int_relational (test_code, (rtx)0, cmp0, cmp1, &invert);
1926 if (reg != (rtx)0)
1927 {
1928 cmp0 = reg;
1929 cmp1 = const0_rtx;
1930 test_code = NE;
1931 }
1932
1933 /* Make sure not non-zero constant if ==/!= */
1934 else if (GET_CODE (cmp1) == CONST_INT && INTVAL (cmp1) != 0)
1935 cmp1 = force_reg (mode, cmp1);
1936
1937 break;
1938
1939 case CMP_DF:
1940 case CMP_SF:
1941 {
1942 rtx reg = gen_rtx (REG, mode, FPSW_REGNUM);
1943 emit_insn (gen_rtx (SET, VOIDmode, reg, gen_rtx (test_code, mode, cmp0, cmp1)));
1944 cmp0 = reg;
1945 cmp1 = const0_rtx;
1946 test_code = NE;
1947 }
1948 break;
1949 }
1950
1951 /* Generate the jump */
1952 if (invert)
1953 {
1954 label2 = label1;
1955 label1 = pc_rtx;
1956 }
1957
1958 emit_jump_insn (gen_rtx (SET, VOIDmode,
1959 pc_rtx,
1960 gen_rtx (IF_THEN_ELSE, VOIDmode,
1961 gen_rtx (test_code, mode, cmp0, cmp1),
1962 label1,
1963 label2)));
1964
1965 return;
1966
1967 fail:
1968 abort_with_insn (gen_rtx (test_code, mode, cmp0, cmp1), "bad test");
1969 }
1970
1971 \f
1972 #if 0
1973 /* Internal code to generate the load and store of one word/short/byte.
1974 The load is emitted directly, and the store insn is returned. */
1975
1976 #define UNITS_PER_MIPS_DWORD 8
1977 #define UNITS_PER_MIPS_WORD 4
1978 #define UNITS_PER_MIPS_HWORD 2
1979
1980 static rtx
1981 block_move_load_store (dest_reg, src_reg, p_bytes, p_offset, align, orig_src)
1982 rtx src_reg; /* register holding source memory address */
1983 rtx dest_reg; /* register holding dest. memory address */
1984 int *p_bytes; /* pointer to # bytes remaining */
1985 int *p_offset; /* pointer to current offset */
1986 int align; /* alignment */
1987 rtx orig_src; /* original source for making a reg note */
1988 {
1989 int bytes; /* # bytes remaining */
1990 int offset; /* offset to use */
1991 int size; /* size in bytes of load/store */
1992 enum machine_mode mode; /* mode to use for load/store */
1993 rtx reg; /* temporary register */
1994 rtx src_addr; /* source address */
1995 rtx dest_addr; /* destination address */
1996 rtx insn; /* insn of the load */
1997 rtx orig_src_addr; /* original source address */
1998 rtx (*load_func)(); /* function to generate load insn */
1999 rtx (*store_func)(); /* function to generate destination insn */
2000
2001 bytes = *p_bytes;
2002 if (bytes <= 0 || align <= 0)
2003 abort ();
2004
2005 if (bytes >= UNITS_PER_MIPS_DWORD && align >= UNIS_PER_MIPS_DWORD)
2006 {
2007 mode = DImode;
2008 size = UNITS_PER_MIPS_DWORD;
2009 load_func = gen_movdi;
2010 store_func = gen_movdi;
2011 }
2012 else if (bytes >= UNITS_PER_MIPS_WORD && align >= UNITS_PER_MIPS_WORD)
2013 {
2014 mode = SImode;
2015 size = UNITS_PER_MIPS_WORD;
2016 load_func = gen_movsi;
2017 store_func = gen_movsi;
2018 }
2019
2020 #if 0
2021 /* Don't generate unaligned moves here, rather defer those to the
2022 general movestrsi_internal pattern.
2023 If this gets commented back in, then should add the dword equivalent. */
2024 else if (bytes >= UNITS_PER_MIPS_WORD)
2025 {
2026 mode = SImode;
2027 size = UNITS_PER_MIPS_WORD;
2028 load_func = gen_movsi_ulw;
2029 store_func = gen_movsi_usw;
2030 }
2031 #endif
2032
2033 else if (bytes >= UNITS_PER_MIPS_SHORT && align >= UNITS_PER_MIPS_SHORT)
2034 {
2035 mode = HImode;
2036 size = UNITS_PER_MIPS_SHORT;
2037 load_func = gen_movhi;
2038 store_func = gen_movhi;
2039 }
2040
2041 else
2042 {
2043 mode = QImode;
2044 size = 1;
2045 load_func = gen_movqi;
2046 store_func = gen_movqi;
2047 }
2048
2049 offset = *p_offset;
2050 *p_offset = offset + size;
2051 *p_bytes = bytes - size;
2052
2053 if (offset == 0)
2054 {
2055 src_addr = src_reg;
2056 dest_addr = dest_reg;
2057 }
2058 else
2059 {
2060 src_addr = gen_rtx (PLUS, Pmode, src_reg, GEN_INT (offset));
2061 dest_addr = gen_rtx (PLUS, Pmode, dest_reg, GEN_INT (offset));
2062 }
2063
2064 reg = gen_reg_rtx (mode);
2065 insn = emit_insn ((*load_func) (reg, gen_rtx (MEM, mode, src_addr)));
2066 orig_src_addr = XEXP (orig_src, 0);
2067 if (CONSTANT_P (orig_src_addr))
2068 REG_NOTES (insn) = gen_rtx (EXPR_LIST, REG_EQUIV,
2069 plus_constant (orig_src_addr, offset),
2070 REG_NOTES (insn));
2071
2072 return (*store_func) (gen_rtx (MEM, mode, dest_addr), reg);
2073 }
2074 #endif
2075
2076 \f
2077 /* Write a series of loads/stores to move some bytes. Generate load/stores as follows:
2078
2079 load 1
2080 load 2
2081 load 3
2082 store 1
2083 load 4
2084 store 2
2085 load 5
2086 store 3
2087 ...
2088
2089 This way, no NOP's are needed, except at the end, and only
2090 two temp registers are needed. Two delay slots are used
2091 in deference to the R4000. */
2092
2093 #if 0
2094 static void
2095 block_move_sequence (dest_reg, src_reg, bytes, align, orig_src)
2096 rtx dest_reg; /* register holding destination address */
2097 rtx src_reg; /* register holding source address */
2098 int bytes; /* # bytes to move */
2099 int align; /* max alignment to assume */
2100 rtx orig_src; /* original source for making a reg note */
2101 {
2102 int offset = 0;
2103 rtx prev2_store = (rtx)0;
2104 rtx prev_store = (rtx)0;
2105 rtx cur_store = (rtx)0;
2106
2107 while (bytes > 0)
2108 {
2109 /* Is there a store to do? */
2110 if (prev2_store)
2111 emit_insn (prev2_store);
2112
2113 prev2_store = prev_store;
2114 prev_store = cur_store;
2115 cur_store = block_move_load_store (dest_reg, src_reg,
2116 &bytes, &offset,
2117 align, orig_src);
2118 }
2119
2120 /* Finish up last three stores. */
2121 if (prev2_store)
2122 emit_insn (prev2_store);
2123
2124 if (prev_store)
2125 emit_insn (prev_store);
2126
2127 if (cur_store)
2128 emit_insn (cur_store);
2129 }
2130 #endif
2131
2132 \f
2133 /* Write a loop to move a constant number of bytes. Generate load/stores as follows:
2134
2135 do {
2136 temp1 = src[0];
2137 temp2 = src[1];
2138 ...
2139 temp<last> = src[MAX_MOVE_REGS-1];
2140 dest[0] = temp1;
2141 dest[1] = temp2;
2142 ...
2143 dest[MAX_MOVE_REGS-1] = temp<last>;
2144 src += MAX_MOVE_REGS;
2145 dest += MAX_MOVE_REGS;
2146 } while (src != final);
2147
2148 This way, no NOP's are needed, and only MAX_MOVE_REGS+3 temp
2149 registers are needed.
2150
2151 Aligned moves move MAX_MOVE_REGS*4 bytes every (2*MAX_MOVE_REGS)+3
2152 cycles, unaligned moves move MAX_MOVE_REGS*4 bytes every
2153 (4*MAX_MOVE_REGS)+3 cycles, assuming no cache misses. */
2154
2155 #define MAX_MOVE_REGS 4
2156 #define MAX_MOVE_BYTES (MAX_MOVE_REGS * UNITS_PER_WORD)
2157
2158 /* ??? Should add code to use DWORD load/stores. */
2159
2160 static void
2161 block_move_loop (dest_reg, src_reg, bytes, align, orig_src)
2162 rtx dest_reg; /* register holding destination address */
2163 rtx src_reg; /* register holding source address */
2164 int bytes; /* # bytes to move */
2165 int align; /* alignment */
2166 rtx orig_src; /* original source for making a reg note */
2167 {
2168 rtx dest_mem = gen_rtx (MEM, BLKmode, dest_reg);
2169 rtx src_mem = gen_rtx (MEM, BLKmode, src_reg);
2170 rtx align_rtx = GEN_INT (align);
2171 rtx label;
2172 rtx final_src;
2173 rtx bytes_rtx;
2174 int leftover;
2175
2176 if (bytes < 2*MAX_MOVE_BYTES)
2177 abort ();
2178
2179 leftover = bytes % MAX_MOVE_BYTES;
2180 bytes -= leftover;
2181
2182 label = gen_label_rtx ();
2183 final_src = gen_reg_rtx (Pmode);
2184 bytes_rtx = GEN_INT (bytes);
2185
2186 if (bytes > 0x7fff)
2187 {
2188 if (TARGET_LONG64)
2189 {
2190 emit_insn (gen_movdi (final_src, bytes_rtx));
2191 emit_insn (gen_adddi3 (final_src, final_src, src_reg));
2192 }
2193 else
2194 {
2195 emit_insn (gen_movsi (final_src, bytes_rtx));
2196 emit_insn (gen_addsi3 (final_src, final_src, src_reg));
2197 }
2198 }
2199 else
2200 {
2201 if (TARGET_LONG64)
2202 emit_insn (gen_adddi3 (final_src, src_reg, bytes_rtx));
2203 else
2204 emit_insn (gen_addsi3 (final_src, src_reg, bytes_rtx));
2205 }
2206
2207 emit_label (label);
2208
2209 bytes_rtx = GEN_INT (MAX_MOVE_BYTES);
2210 emit_insn (gen_movstrsi_internal (dest_mem, src_mem, bytes_rtx, align_rtx));
2211 if (TARGET_LONG64)
2212 {
2213 emit_insn (gen_adddi3 (src_reg, src_reg, bytes_rtx));
2214 emit_insn (gen_adddi3 (dest_reg, dest_reg, bytes_rtx));
2215 emit_insn (gen_cmpdi (src_reg, final_src));
2216 }
2217 else
2218 {
2219 emit_insn (gen_addsi3 (src_reg, src_reg, bytes_rtx));
2220 emit_insn (gen_addsi3 (dest_reg, dest_reg, bytes_rtx));
2221 emit_insn (gen_cmpsi (src_reg, final_src));
2222 }
2223 emit_jump_insn (gen_bne (label));
2224
2225 if (leftover)
2226 emit_insn (gen_movstrsi_internal (dest_mem, src_mem,
2227 GEN_INT (leftover),
2228 align_rtx));
2229 }
2230
2231 \f
2232 /* Use a library function to move some bytes. */
2233
2234 static void
2235 block_move_call (dest_reg, src_reg, bytes_rtx)
2236 rtx dest_reg;
2237 rtx src_reg;
2238 rtx bytes_rtx;
2239 {
2240 /* We want to pass the size as Pmode, which will normally be SImode
2241 but will be DImode if we are using 64 bit longs and pointers. */
2242 if (GET_MODE (bytes_rtx) != VOIDmode
2243 && GET_MODE (bytes_rtx) != Pmode)
2244 bytes_rtx = convert_to_mode (Pmode, bytes_rtx, TRUE);
2245
2246 #ifdef TARGET_MEM_FUNCTIONS
2247 emit_library_call (gen_rtx (SYMBOL_REF, Pmode, "memcpy"), 0,
2248 VOIDmode, 3,
2249 dest_reg, Pmode,
2250 src_reg, Pmode,
2251 bytes_rtx, Pmode);
2252 #else
2253 emit_library_call (gen_rtx (SYMBOL_REF, Pmode, "bcopy"), 0,
2254 VOIDmode, 3,
2255 src_reg, Pmode,
2256 dest_reg, Pmode,
2257 bytes_rtx, Pmode);
2258 #endif
2259 }
2260
2261 \f
2262 /* Expand string/block move operations.
2263
2264 operands[0] is the pointer to the destination.
2265 operands[1] is the pointer to the source.
2266 operands[2] is the number of bytes to move.
2267 operands[3] is the alignment. */
2268
2269 void
2270 expand_block_move (operands)
2271 rtx operands[];
2272 {
2273 rtx bytes_rtx = operands[2];
2274 rtx align_rtx = operands[3];
2275 int constp = (GET_CODE (bytes_rtx) == CONST_INT);
2276 int bytes = (constp ? INTVAL (bytes_rtx) : 0);
2277 int align = INTVAL (align_rtx);
2278 rtx orig_src = operands[1];
2279 rtx src_reg;
2280 rtx dest_reg;
2281
2282 if (constp && bytes <= 0)
2283 return;
2284
2285 if (align > UNITS_PER_WORD)
2286 align = UNITS_PER_WORD;
2287
2288 /* Move the address into scratch registers. */
2289 dest_reg = copy_addr_to_reg (XEXP (operands[0], 0));
2290 src_reg = copy_addr_to_reg (XEXP (orig_src, 0));
2291
2292 if (TARGET_MEMCPY)
2293 block_move_call (dest_reg, src_reg, bytes_rtx);
2294
2295 #if 0
2296 else if (constp && bytes <= 3*align)
2297 block_move_sequence (dest_reg, src_reg, bytes, align, orig_src);
2298 #endif
2299
2300 else if (constp && bytes <= 2*MAX_MOVE_BYTES)
2301 emit_insn (gen_movstrsi_internal (gen_rtx (MEM, BLKmode, dest_reg),
2302 gen_rtx (MEM, BLKmode, src_reg),
2303 bytes_rtx, align_rtx));
2304
2305 else if (constp && align >= UNITS_PER_WORD && optimize)
2306 block_move_loop (dest_reg, src_reg, bytes, align, orig_src);
2307
2308 else if (constp && optimize)
2309 {
2310 /* If the alignment is not word aligned, generate a test at
2311 runtime, to see whether things wound up aligned, and we
2312 can use the faster lw/sw instead ulw/usw. */
2313
2314 rtx temp = gen_reg_rtx (Pmode);
2315 rtx aligned_label = gen_label_rtx ();
2316 rtx join_label = gen_label_rtx ();
2317 int leftover = bytes % MAX_MOVE_BYTES;
2318
2319 bytes -= leftover;
2320
2321 if (TARGET_LONG64)
2322 {
2323 emit_insn (gen_iordi3 (temp, src_reg, dest_reg));
2324 emit_insn (gen_anddi3 (temp, temp, GEN_INT (UNITS_PER_WORD-1)));
2325 emit_insn (gen_cmpdi (temp, const0_rtx));
2326 }
2327 else
2328 {
2329 emit_insn (gen_iorsi3 (temp, src_reg, dest_reg));
2330 emit_insn (gen_andsi3 (temp, temp, GEN_INT (UNITS_PER_WORD-1)));
2331 emit_insn (gen_cmpsi (temp, const0_rtx));
2332 }
2333 emit_jump_insn (gen_beq (aligned_label));
2334
2335 /* Unaligned loop. */
2336 block_move_loop (dest_reg, src_reg, bytes, 1, orig_src);
2337 emit_jump_insn (gen_jump (join_label));
2338 emit_barrier ();
2339
2340 /* Aligned loop. */
2341 emit_label (aligned_label);
2342 block_move_loop (dest_reg, src_reg, bytes, UNITS_PER_WORD, orig_src);
2343 emit_label (join_label);
2344
2345 /* Bytes at the end of the loop. */
2346 if (leftover)
2347 {
2348 #if 0
2349 if (leftover <= 3*align)
2350 block_move_sequence (dest_reg, src_reg, leftover, align, orig_src);
2351
2352 else
2353 #endif
2354 emit_insn (gen_movstrsi_internal (gen_rtx (MEM, BLKmode, dest_reg),
2355 gen_rtx (MEM, BLKmode, src_reg),
2356 GEN_INT (leftover),
2357 GEN_INT (align)));
2358 }
2359 }
2360
2361 else
2362 block_move_call (dest_reg, src_reg, bytes_rtx);
2363 }
2364
2365 \f
2366 /* Emit load/stores for a small constant block_move.
2367
2368 operands[0] is the memory address of the destination.
2369 operands[1] is the memory address of the source.
2370 operands[2] is the number of bytes to move.
2371 operands[3] is the alignment.
2372 operands[4] is a temp register.
2373 operands[5] is a temp register.
2374 ...
2375 operands[3+num_regs] is the last temp register.
2376
2377 The block move type can be one of the following:
2378 BLOCK_MOVE_NORMAL Do all of the block move.
2379 BLOCK_MOVE_NOT_LAST Do all but the last store.
2380 BLOCK_MOVE_LAST Do just the last store. */
2381
2382 char *
2383 output_block_move (insn, operands, num_regs, move_type)
2384 rtx insn;
2385 rtx operands[];
2386 int num_regs;
2387 enum block_move_type move_type;
2388 {
2389 rtx dest_reg = XEXP (operands[0], 0);
2390 rtx src_reg = XEXP (operands[1], 0);
2391 int bytes = INTVAL (operands[2]);
2392 int align = INTVAL (operands[3]);
2393 int num = 0;
2394 int offset = 0;
2395 int use_lwl_lwr = FALSE;
2396 int last_operand = num_regs+4;
2397 int safe_regs = 4;
2398 int i;
2399 rtx xoperands[10];
2400
2401 struct {
2402 char *load; /* load insn without nop */
2403 char *load_nop; /* load insn with trailing nop */
2404 char *store; /* store insn */
2405 char *final; /* if last_store used: NULL or swr */
2406 char *last_store; /* last store instruction */
2407 int offset; /* current offset */
2408 enum machine_mode mode; /* mode to use on (MEM) */
2409 } load_store[4];
2410
2411 /* Detect a bug in GCC, where it can give us a register
2412 the same as one of the addressing registers and reduce
2413 the number of registers available. */
2414 for (i = 4;
2415 i < last_operand && safe_regs < (sizeof(xoperands) / sizeof(xoperands[0]));
2416 i++)
2417 {
2418 if (!reg_mentioned_p (operands[i], operands[0])
2419 && !reg_mentioned_p (operands[i], operands[1]))
2420
2421 xoperands[safe_regs++] = operands[i];
2422 }
2423
2424 if (safe_regs < last_operand)
2425 {
2426 xoperands[0] = operands[0];
2427 xoperands[1] = operands[1];
2428 xoperands[2] = operands[2];
2429 xoperands[3] = operands[3];
2430 return output_block_move (insn, xoperands, safe_regs-4, move_type);
2431 }
2432
2433 /* If we are given global or static addresses, and we would be
2434 emitting a few instructions, try to save time by using a
2435 temporary register for the pointer. */
2436 if (num_regs > 2 && (bytes > 2*align || move_type != BLOCK_MOVE_NORMAL))
2437 {
2438 if (CONSTANT_P (src_reg))
2439 {
2440 if (TARGET_STATS)
2441 mips_count_memory_refs (operands[1], 1);
2442
2443 src_reg = operands[ 3 + num_regs-- ];
2444 if (move_type != BLOCK_MOVE_LAST)
2445 {
2446 xoperands[1] = operands[1];
2447 xoperands[0] = src_reg;
2448 output_asm_insn ("la\t%0,%1", xoperands);
2449 }
2450 }
2451
2452 if (CONSTANT_P (dest_reg))
2453 {
2454 if (TARGET_STATS)
2455 mips_count_memory_refs (operands[0], 1);
2456
2457 dest_reg = operands[ 3 + num_regs-- ];
2458 if (move_type != BLOCK_MOVE_LAST)
2459 {
2460 xoperands[1] = operands[0];
2461 xoperands[0] = dest_reg;
2462 output_asm_insn ("la\t%0,%1", xoperands);
2463 }
2464 }
2465 }
2466
2467 if (num_regs > (sizeof (load_store) / sizeof (load_store[0])))
2468 num_regs = (sizeof (load_store) / sizeof (load_store[0]));
2469
2470 else if (num_regs < 1)
2471 abort_with_insn (insn, "Cannot do block move, not enough scratch registers");
2472
2473 while (bytes > 0)
2474 {
2475 load_store[num].offset = offset;
2476
2477 if (TARGET_64BIT && bytes >= 8 && align >= 8)
2478 {
2479 load_store[num].load = "ld\t%0,%1";
2480 load_store[num].load_nop = "ld\t%0,%1%#";
2481 load_store[num].store = "sd\t%0,%1";
2482 load_store[num].last_store = "sd\t%0,%1";
2483 load_store[num].final = (char *)0;
2484 load_store[num].mode = DImode;
2485 offset += 8;
2486 bytes -= 8;
2487 }
2488
2489 /* ??? Fails because of a MIPS assembler bug? */
2490 else if (TARGET_64BIT && bytes >= 8)
2491 {
2492 if (BYTES_BIG_ENDIAN)
2493 {
2494 load_store[num].load = "ldl\t%0,%1\n\tldr\t%0,%2";
2495 load_store[num].load_nop = "ldl\t%0,%1\n\tldr\t%0,%2%#";
2496 load_store[num].store = "sdl\t%0,%1\n\tsdr\t%0,%2";
2497 load_store[num].last_store = "sdr\t%0,%2";
2498 load_store[num].final = "sdl\t%0,%1";
2499 }
2500 else
2501 {
2502 load_store[num].load = "ldl\t%0,%2\n\tldr\t%0,%1";
2503 load_store[num].load_nop = "ldl\t%0,%2\n\tldr\t%0,%1%#";
2504 load_store[num].store = "sdl\t%0,%2\n\tsdr\t%0,%1";
2505 load_store[num].last_store = "sdr\t%0,%1";
2506 load_store[num].final = "sdl\t%0,%2";
2507 }
2508 load_store[num].mode = DImode;
2509 offset += 8;
2510 bytes -= 8;
2511 use_lwl_lwr = TRUE;
2512 }
2513
2514 else if (bytes >= 4 && align >= 4)
2515 {
2516 load_store[num].load = "lw\t%0,%1";
2517 load_store[num].load_nop = "lw\t%0,%1%#";
2518 load_store[num].store = "sw\t%0,%1";
2519 load_store[num].last_store = "sw\t%0,%1";
2520 load_store[num].final = (char *)0;
2521 load_store[num].mode = SImode;
2522 offset += 4;
2523 bytes -= 4;
2524 }
2525
2526 else if (bytes >= 4)
2527 {
2528 if (BYTES_BIG_ENDIAN)
2529 {
2530 load_store[num].load = "lwl\t%0,%1\n\tlwr\t%0,%2";
2531 load_store[num].load_nop = "lwl\t%0,%1\n\tlwr\t%0,%2%#";
2532 load_store[num].store = "swl\t%0,%1\n\tswr\t%0,%2";
2533 load_store[num].last_store = "swr\t%0,%2";
2534 load_store[num].final = "swl\t%0,%1";
2535 }
2536 else
2537 {
2538 load_store[num].load = "lwl\t%0,%2\n\tlwr\t%0,%1";
2539 load_store[num].load_nop = "lwl\t%0,%2\n\tlwr\t%0,%1%#";
2540 load_store[num].store = "swl\t%0,%2\n\tswr\t%0,%1";
2541 load_store[num].last_store = "swr\t%0,%1";
2542 load_store[num].final = "swl\t%0,%2";
2543 }
2544 load_store[num].mode = SImode;
2545 offset += 4;
2546 bytes -= 4;
2547 use_lwl_lwr = TRUE;
2548 }
2549
2550 else if (bytes >= 2 && align >= 2)
2551 {
2552 load_store[num].load = "lh\t%0,%1";
2553 load_store[num].load_nop = "lh\t%0,%1%#";
2554 load_store[num].store = "sh\t%0,%1";
2555 load_store[num].last_store = "sh\t%0,%1";
2556 load_store[num].final = (char *)0;
2557 load_store[num].mode = HImode;
2558 offset += 2;
2559 bytes -= 2;
2560 }
2561
2562 else
2563 {
2564 load_store[num].load = "lb\t%0,%1";
2565 load_store[num].load_nop = "lb\t%0,%1%#";
2566 load_store[num].store = "sb\t%0,%1";
2567 load_store[num].last_store = "sb\t%0,%1";
2568 load_store[num].final = (char *)0;
2569 load_store[num].mode = QImode;
2570 offset++;
2571 bytes--;
2572 }
2573
2574 if (TARGET_STATS && move_type != BLOCK_MOVE_LAST)
2575 {
2576 dslots_load_total++;
2577 dslots_load_filled++;
2578
2579 if (CONSTANT_P (src_reg))
2580 mips_count_memory_refs (src_reg, 1);
2581
2582 if (CONSTANT_P (dest_reg))
2583 mips_count_memory_refs (dest_reg, 1);
2584 }
2585
2586 /* Emit load/stores now if we have run out of registers or are
2587 at the end of the move. */
2588
2589 if (++num == num_regs || bytes == 0)
2590 {
2591 /* If only load/store, we need a NOP after the load. */
2592 if (num == 1)
2593 {
2594 load_store[0].load = load_store[0].load_nop;
2595 if (TARGET_STATS && move_type != BLOCK_MOVE_LAST)
2596 dslots_load_filled--;
2597 }
2598
2599 if (move_type != BLOCK_MOVE_LAST)
2600 {
2601 for (i = 0; i < num; i++)
2602 {
2603 int offset;
2604
2605 if (!operands[i+4])
2606 abort ();
2607
2608 if (GET_MODE (operands[i+4]) != load_store[i].mode)
2609 operands[i+4] = gen_rtx (REG, load_store[i].mode, REGNO (operands[i+4]));
2610
2611 offset = load_store[i].offset;
2612 xoperands[0] = operands[i+4];
2613 xoperands[1] = gen_rtx (MEM, load_store[i].mode,
2614 plus_constant (src_reg, offset));
2615
2616 if (use_lwl_lwr)
2617 {
2618 int extra_offset;
2619 extra_offset = GET_MODE_SIZE (load_store[i].mode) - 1;
2620 xoperands[2] = gen_rtx (MEM, load_store[i].mode,
2621 plus_constant (src_reg,
2622 extra_offset
2623 + offset));
2624 }
2625
2626 output_asm_insn (load_store[i].load, xoperands);
2627 }
2628 }
2629
2630 for (i = 0; i < num; i++)
2631 {
2632 int last_p = (i == num-1 && bytes == 0);
2633 int offset = load_store[i].offset;
2634
2635 xoperands[0] = operands[i+4];
2636 xoperands[1] = gen_rtx (MEM, load_store[i].mode,
2637 plus_constant (dest_reg, offset));
2638
2639
2640 if (use_lwl_lwr)
2641 {
2642 int extra_offset;
2643 extra_offset = GET_MODE_SIZE (load_store[i].mode) - 1;
2644 xoperands[2] = gen_rtx (MEM, load_store[i].mode,
2645 plus_constant (dest_reg,
2646 extra_offset
2647 + offset));
2648 }
2649
2650 if (move_type == BLOCK_MOVE_NORMAL)
2651 output_asm_insn (load_store[i].store, xoperands);
2652
2653 else if (move_type == BLOCK_MOVE_NOT_LAST)
2654 {
2655 if (!last_p)
2656 output_asm_insn (load_store[i].store, xoperands);
2657
2658 else if (load_store[i].final != (char *)0)
2659 output_asm_insn (load_store[i].final, xoperands);
2660 }
2661
2662 else if (last_p)
2663 output_asm_insn (load_store[i].last_store, xoperands);
2664 }
2665
2666 num = 0; /* reset load_store */
2667 use_lwl_lwr = FALSE;
2668 }
2669 }
2670
2671 return "";
2672 }
2673
2674 \f
2675 /* Argument support functions. */
2676
2677 /* Initialize CUMULATIVE_ARGS for a function. */
2678
2679 void
2680 init_cumulative_args (cum, fntype, libname)
2681 CUMULATIVE_ARGS *cum; /* argument info to initialize */
2682 tree fntype; /* tree ptr for function decl */
2683 rtx libname; /* SYMBOL_REF of library name or 0 */
2684 {
2685 static CUMULATIVE_ARGS zero_cum;
2686 tree param, next_param;
2687
2688 if (TARGET_DEBUG_E_MODE)
2689 {
2690 fprintf (stderr, "\ninit_cumulative_args, fntype = 0x%.8lx", (long)fntype);
2691 if (!fntype)
2692 fputc ('\n', stderr);
2693
2694 else
2695 {
2696 tree ret_type = TREE_TYPE (fntype);
2697 fprintf (stderr, ", fntype code = %s, ret code = %s\n",
2698 tree_code_name[ (int)TREE_CODE (fntype) ],
2699 tree_code_name[ (int)TREE_CODE (ret_type) ]);
2700 }
2701 }
2702
2703 *cum = zero_cum;
2704
2705 /* Determine if this function has variable arguments. This is
2706 indicated by the last argument being 'void_type_mode' if there
2707 are no variable arguments. The standard MIPS calling sequence
2708 passes all arguments in the general purpose registers in this
2709 case. */
2710
2711 for (param = (fntype) ? TYPE_ARG_TYPES (fntype) : 0;
2712 param != (tree)0;
2713 param = next_param)
2714 {
2715 next_param = TREE_CHAIN (param);
2716 if (next_param == (tree)0 && TREE_VALUE (param) != void_type_node)
2717 cum->gp_reg_found = 1;
2718 }
2719 }
2720
2721 /* Advance the argument to the next argument position. */
2722
2723 void
2724 function_arg_advance (cum, mode, type, named)
2725 CUMULATIVE_ARGS *cum; /* current arg information */
2726 enum machine_mode mode; /* current arg mode */
2727 tree type; /* type of the argument or 0 if lib support */
2728 int named; /* whether or not the argument was named */
2729 {
2730 if (TARGET_DEBUG_E_MODE)
2731 fprintf (stderr,
2732 "function_adv( {gp reg found = %d, arg # = %2d, words = %2d}, %4s, 0x%.8x, %d )\n\n",
2733 cum->gp_reg_found, cum->arg_number, cum->arg_words, GET_MODE_NAME (mode),
2734 type, named);
2735
2736 cum->arg_number++;
2737 switch (mode)
2738 {
2739 case VOIDmode:
2740 break;
2741
2742 default:
2743 if (GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
2744 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT)
2745 abort ();
2746 cum->gp_reg_found = 1;
2747 cum->arg_words += ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1)
2748 / UNITS_PER_WORD);
2749 break;
2750
2751 case BLKmode:
2752 cum->gp_reg_found = 1;
2753 cum->arg_words += ((int_size_in_bytes (type) + UNITS_PER_WORD - 1)
2754 / UNITS_PER_WORD);
2755 break;
2756
2757 case SFmode:
2758 cum->arg_words++;
2759 break;
2760
2761 case DFmode:
2762 cum->arg_words += (TARGET_64BIT ? 1 : 2);
2763 break;
2764
2765 case DImode:
2766 cum->gp_reg_found = 1;
2767 cum->arg_words += (TARGET_64BIT ? 1 : 2);
2768 break;
2769
2770 case QImode:
2771 case HImode:
2772 case SImode:
2773 cum->gp_reg_found = 1;
2774 cum->arg_words++;
2775 break;
2776 }
2777 }
2778
2779 /* Return an RTL expression containing the register for the given mode,
2780 or 0 if the argument is to be passed on the stack. */
2781
2782 struct rtx_def *
2783 function_arg (cum, mode, type, named)
2784 CUMULATIVE_ARGS *cum; /* current arg information */
2785 enum machine_mode mode; /* current arg mode */
2786 tree type; /* type of the argument or 0 if lib support */
2787 int named; /* != 0 for normal args, == 0 for ... args */
2788 {
2789 rtx ret;
2790 int regbase = -1;
2791 int bias = 0;
2792 int struct_p = ((type != (tree)0)
2793 && (TREE_CODE (type) == RECORD_TYPE
2794 || TREE_CODE (type) == UNION_TYPE));
2795
2796 if (TARGET_DEBUG_E_MODE)
2797 fprintf (stderr,
2798 "function_arg( {gp reg found = %d, arg # = %2d, words = %2d}, %4s, 0x%.8x, %d ) = ",
2799 cum->gp_reg_found, cum->arg_number, cum->arg_words, GET_MODE_NAME (mode),
2800 type, named);
2801
2802 switch (mode)
2803 {
2804 case SFmode:
2805 if (cum->gp_reg_found || cum->arg_number >= 2 || TARGET_SOFT_FLOAT)
2806 regbase = GP_ARG_FIRST;
2807 else
2808 {
2809 regbase = FP_ARG_FIRST;
2810 /* If the first arg was a float in a floating point register,
2811 then set bias to align this float arg properly. */
2812 if (cum->arg_words == 1)
2813 bias = 1;
2814 }
2815
2816 break;
2817
2818 case DFmode:
2819 if (! TARGET_64BIT)
2820 cum->arg_words += (cum->arg_words & 1);
2821 regbase = (cum->gp_reg_found || TARGET_SOFT_FLOAT || cum->arg_number >= 2
2822 ? GP_ARG_FIRST
2823 : FP_ARG_FIRST);
2824 break;
2825
2826 default:
2827 if (GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
2828 && GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT)
2829 abort ();
2830
2831 /* Drops through. */
2832 case BLKmode:
2833 if (type != (tree)0 && TYPE_ALIGN (type) > BITS_PER_WORD
2834 && ! TARGET_64BIT)
2835 cum->arg_words += (cum->arg_words & 1);
2836
2837 regbase = GP_ARG_FIRST;
2838 break;
2839
2840 case VOIDmode:
2841 case QImode:
2842 case HImode:
2843 case SImode:
2844 regbase = GP_ARG_FIRST;
2845 break;
2846
2847 case DImode:
2848 if (! TARGET_64BIT)
2849 cum->arg_words += (cum->arg_words & 1);
2850 regbase = GP_ARG_FIRST;
2851 }
2852
2853 if (cum->arg_words >= MAX_ARGS_IN_REGISTERS)
2854 {
2855 if (TARGET_DEBUG_E_MODE)
2856 fprintf (stderr, "<stack>%s\n", struct_p ? ", [struct]" : "");
2857
2858 ret = (rtx)0;
2859 }
2860 else
2861 {
2862 if (regbase == -1)
2863 abort ();
2864
2865 ret = gen_rtx (REG, mode, regbase + cum->arg_words + bias);
2866
2867 if (TARGET_DEBUG_E_MODE)
2868 fprintf (stderr, "%s%s\n", reg_names[regbase + cum->arg_words + bias],
2869 struct_p ? ", [struct]" : "");
2870
2871 /* The following is a hack in order to pass 1 byte structures
2872 the same way that the MIPS compiler does (namely by passing
2873 the structure in the high byte or half word of the register).
2874 This also makes varargs work. If we have such a structure,
2875 we save the adjustment RTL, and the call define expands will
2876 emit them. For the VOIDmode argument (argument after the
2877 last real argument), pass back a parallel vector holding each
2878 of the adjustments. */
2879
2880 /* ??? function_arg can be called more than once for each argument.
2881 As a result, we compute more adjustments than we need here.
2882 See the CUMULATIVE_ARGS definition in mips.h. */
2883
2884 /* ??? This scheme requires everything smaller than the word size to
2885 shifted to the left, but when TARGET_64BIT and ! TARGET_INT64,
2886 that would mean every int needs to be shifted left, which is very
2887 inefficient. Let's not carry this compatibility to the 64 bit
2888 calling convention for now. */
2889
2890 if (struct_p && int_size_in_bytes (type) < UNITS_PER_WORD
2891 && ! TARGET_64BIT)
2892 {
2893 rtx amount = GEN_INT (BITS_PER_WORD
2894 - int_size_in_bytes (type) * BITS_PER_UNIT);
2895 rtx reg = gen_rtx (REG, word_mode, regbase + cum->arg_words + bias);
2896 if (TARGET_64BIT)
2897 cum->adjust[ cum->num_adjusts++ ] = gen_ashldi3 (reg, reg, amount);
2898 else
2899 cum->adjust[ cum->num_adjusts++ ] = gen_ashlsi3 (reg, reg, amount);
2900 }
2901 }
2902
2903 if (mode == VOIDmode && cum->num_adjusts > 0)
2904 ret = gen_rtx (PARALLEL, VOIDmode, gen_rtvec_v (cum->num_adjusts, cum->adjust));
2905
2906 return ret;
2907 }
2908
2909
2910 int
2911 function_arg_partial_nregs (cum, mode, type, named)
2912 CUMULATIVE_ARGS *cum; /* current arg information */
2913 enum machine_mode mode; /* current arg mode */
2914 tree type; /* type of the argument or 0 if lib support */
2915 int named; /* != 0 for normal args, == 0 for ... args */
2916 {
2917 if ((mode == BLKmode
2918 || GET_MODE_CLASS (mode) != MODE_COMPLEX_INT
2919 || GET_MODE_CLASS (mode) != MODE_COMPLEX_FLOAT)
2920 && cum->arg_words < MAX_ARGS_IN_REGISTERS)
2921 {
2922 int words;
2923 if (mode == BLKmode)
2924 words = ((int_size_in_bytes (type) + UNITS_PER_WORD - 1)
2925 / UNITS_PER_WORD);
2926 else
2927 words = (GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD;
2928
2929 if (words + cum->arg_words <= MAX_ARGS_IN_REGISTERS)
2930 return 0; /* structure fits in registers */
2931
2932 if (TARGET_DEBUG_E_MODE)
2933 fprintf (stderr, "function_arg_partial_nregs = %d\n",
2934 MAX_ARGS_IN_REGISTERS - cum->arg_words);
2935
2936 return MAX_ARGS_IN_REGISTERS - cum->arg_words;
2937 }
2938
2939 else if (mode == DImode && cum->arg_words == MAX_ARGS_IN_REGISTERS-1
2940 && ! TARGET_64BIT)
2941 {
2942 if (TARGET_DEBUG_E_MODE)
2943 fprintf (stderr, "function_arg_partial_nregs = 1\n");
2944
2945 return 1;
2946 }
2947
2948 return 0;
2949 }
2950
2951 \f
2952 /* Print the options used in the assembly file. */
2953
2954 static struct {char *name; int value;} target_switches []
2955 = TARGET_SWITCHES;
2956
2957 void
2958 print_options (out)
2959 FILE *out;
2960 {
2961 int line_len;
2962 int len;
2963 int j;
2964 char **p;
2965 int mask = TARGET_DEFAULT;
2966
2967 /* Allow assembly language comparisons with -mdebug eliminating the
2968 compiler version number and switch lists. */
2969
2970 if (TARGET_DEBUG_MODE)
2971 return;
2972
2973 fprintf (out, "\n # %s %s", language_string, version_string);
2974 #ifdef TARGET_VERSION_INTERNAL
2975 TARGET_VERSION_INTERNAL (out);
2976 #endif
2977 #ifdef __GNUC__
2978 fprintf (out, " compiled by GNU C\n\n");
2979 #else
2980 fprintf (out, " compiled by CC\n\n");
2981 #endif
2982
2983 fprintf (out, " # Cc1 defaults:");
2984 line_len = 32767;
2985 for (j = 0; j < sizeof target_switches / sizeof target_switches[0]; j++)
2986 {
2987 if (target_switches[j].name[0] != '\0'
2988 && target_switches[j].value > 0
2989 && (target_switches[j].value & mask) == target_switches[j].value)
2990 {
2991 mask &= ~ target_switches[j].value;
2992 len = strlen (target_switches[j].name) + 1;
2993 if (len + line_len > 79)
2994 {
2995 line_len = 2;
2996 fputs ("\n #", out);
2997 }
2998 fprintf (out, " -m%s", target_switches[j].name);
2999 line_len += len;
3000 }
3001 }
3002
3003 fprintf (out, "\n\n # Cc1 arguments (-G value = %d, Cpu = %s, ISA = %d):",
3004 mips_section_threshold, mips_cpu_string, mips_isa);
3005
3006 line_len = 32767;
3007 for (p = &save_argv[1]; *p != (char *)0; p++)
3008 {
3009 char *arg = *p;
3010 if (*arg == '-')
3011 {
3012 len = strlen (arg) + 1;
3013 if (len + line_len > 79)
3014 {
3015 line_len = 2;
3016 fputs ("\n #", out);
3017 }
3018 fprintf (out, " %s", *p);
3019 line_len += len;
3020 }
3021 }
3022
3023 fputs ("\n\n", out);
3024 }
3025
3026 \f
3027 /* Abort after printing out a specific insn. */
3028
3029 void
3030 abort_with_insn (insn, reason)
3031 rtx insn;
3032 char *reason;
3033 {
3034 error (reason);
3035 debug_rtx (insn);
3036 abort ();
3037 }
3038
3039 /* Write a message to stderr (for use in macros expanded in files that do not
3040 include stdio.h). */
3041
3042 void
3043 trace (s, s1, s2)
3044 char *s, *s1, *s2;
3045 {
3046 fprintf (stderr, s, s1, s2);
3047 }
3048
3049 \f
3050 #ifdef SIGINFO
3051
3052 static void
3053 siginfo (signo)
3054 int signo;
3055 {
3056 fprintf (stderr, "compiling '%s' in '%s'\n",
3057 (current_function_name != (char *)0) ? current_function_name : "<toplevel>",
3058 (current_function_file != (char *)0) ? current_function_file : "<no file>");
3059 fflush (stderr);
3060 }
3061 #endif /* SIGINFO */
3062
3063 \f
3064 /* Set up the threshold for data to go into the small data area, instead
3065 of the normal data area, and detect any conflicts in the switches. */
3066
3067 void
3068 override_options ()
3069 {
3070 register int i, start;
3071 register int regno;
3072 register enum machine_mode mode;
3073
3074 mips_section_threshold = (g_switch_set) ? g_switch_value : MIPS_DEFAULT_GVALUE;
3075
3076 if (mips_section_threshold <= 0)
3077 target_flags &= ~MASK_GPOPT;
3078 else if (optimize)
3079 target_flags |= MASK_GPOPT;
3080
3081 /* Get the architectural level. */
3082 if (mips_isa_string == (char *)0)
3083 {
3084 #ifdef MIPS_ISA_DEFAULT
3085 mips_isa = MIPS_ISA_DEFAULT;
3086 #else
3087 mips_isa = 1;
3088 #endif
3089 }
3090
3091 else if (isdigit (*mips_isa_string))
3092 {
3093 mips_isa = atoi (mips_isa_string);
3094 if (mips_isa < 1 || mips_isa > 3)
3095 {
3096 error ("-mips%d not supported", mips_isa);
3097 mips_isa = 1;
3098 }
3099 }
3100
3101 else
3102 {
3103 error ("bad value (%s) for -mips switch", mips_isa_string);
3104 mips_isa = 1;
3105 }
3106
3107 /* Identify the processor type */
3108 if (mips_cpu_string == (char *)0
3109 || !strcmp (mips_cpu_string, "default")
3110 || !strcmp (mips_cpu_string, "DEFAULT"))
3111 {
3112 switch (mips_isa)
3113 {
3114 default:
3115 mips_cpu_string = "3000";
3116 mips_cpu = PROCESSOR_R3000;
3117 break;
3118 case 2:
3119 mips_cpu_string = "6000";
3120 mips_cpu = PROCESSOR_R6000;
3121 break;
3122 case 3:
3123 mips_cpu_string = "4000";
3124 mips_cpu = PROCESSOR_R4000;
3125 break;
3126 }
3127
3128 #ifdef MIPS_CPU_DEFAULT
3129 if (mips_isa_string == (char *)0)
3130 {
3131 mips_cpu_string = MIPS_CPU_STRING_DEFAULT;
3132 mips_cpu = MIPS_CPU_DEFAULT;
3133 }
3134 #endif
3135 }
3136
3137 else
3138 {
3139 char *p = mips_cpu_string;
3140
3141 if (*p == 'r' || *p == 'R')
3142 p++;
3143
3144 /* Since there is no difference between a R2000 and R3000 in
3145 terms of the scheduler, we collapse them into just an R3000. */
3146
3147 mips_cpu = PROCESSOR_DEFAULT;
3148 switch (*p)
3149 {
3150 case '2':
3151 if (!strcmp (p, "2000") || !strcmp (p, "2k") || !strcmp (p, "2K"))
3152 mips_cpu = PROCESSOR_R3000;
3153 break;
3154
3155 case '3':
3156 if (!strcmp (p, "3000") || !strcmp (p, "3k") || !strcmp (p, "3K"))
3157 mips_cpu = PROCESSOR_R3000;
3158 break;
3159
3160 case '4':
3161 if (!strcmp (p, "4000") || !strcmp (p, "4k") || !strcmp (p, "4K"))
3162 mips_cpu = PROCESSOR_R4000;
3163 /* The r4400 is exactly the same as the r4000 from the compiler's
3164 viewpoint. */
3165 else if (!strcmp (p, "4400"))
3166 mips_cpu = PROCESSOR_R4000;
3167 else if (!strcmp (p, "4600"))
3168 mips_cpu = PROCESSOR_R4600;
3169 break;
3170
3171 case '6':
3172 if (!strcmp (p, "6000") || !strcmp (p, "6k") || !strcmp (p, "6K"))
3173 mips_cpu = PROCESSOR_R6000;
3174 break;
3175
3176 case 'o':
3177 if (!strcmp (p, "orion"))
3178 mips_cpu = PROCESSOR_R4600;
3179 break;
3180 }
3181
3182 if (mips_cpu == PROCESSOR_DEFAULT)
3183 {
3184 error ("bad value (%s) for -mcpu= switch", mips_cpu_string);
3185 mips_cpu_string = "default";
3186 }
3187 }
3188
3189 if ((mips_cpu == PROCESSOR_R3000 && mips_isa > 1)
3190 || (mips_cpu == PROCESSOR_R6000 && mips_isa > 2))
3191 error ("-mcpu=%s does not support -mips%d", mips_cpu_string, mips_isa);
3192
3193 /* make sure sizes of ints/longs/etc. are ok */
3194 if (mips_isa < 3)
3195 {
3196 if (TARGET_INT64)
3197 fatal ("Only MIPS-III CPUs can support 64 bit ints");
3198
3199 else if (TARGET_LONG64)
3200 fatal ("Only MIPS-III CPUs can support 64 bit longs");
3201
3202 else if (TARGET_FLOAT64)
3203 fatal ("Only MIPS-III CPUs can support 64 bit fp registers");
3204
3205 else if (TARGET_64BIT)
3206 fatal ("Only MIPS-III CPUs can support 64 bit gp registers");
3207 }
3208
3209 /* Tell halfpic.c that we have half-pic code if we do. */
3210 if (TARGET_HALF_PIC)
3211 HALF_PIC_INIT ();
3212
3213 /* -fpic (-KPIC) is the default when TARGET_ABICALLS is defined. We need
3214 to set flag_pic so that the LEGITIMATE_PIC_OPERAND_P macro will work. */
3215 /* ??? -non_shared turns off pic code generation, but this is not
3216 implemented. */
3217 if (TARGET_ABICALLS)
3218 {
3219 mips_abicalls = MIPS_ABICALLS_YES;
3220 flag_pic = 1;
3221 if (mips_section_threshold > 0)
3222 warning ("-G is incompatible with PIC code which is the default");
3223 }
3224 else
3225 mips_abicalls = MIPS_ABICALLS_NO;
3226
3227 /* -membedded-pic is a form of PIC code suitable for embedded
3228 systems. All calls are made using PC relative addressing, and
3229 all data is addressed using the $gp register. This requires gas,
3230 which does most of the work, and GNU ld, which automatically
3231 expands PC relative calls which are out of range into a longer
3232 instruction sequence. All gcc really does differently is
3233 generate a different sequence for a switch. */
3234 if (TARGET_EMBEDDED_PIC)
3235 {
3236 flag_pic = 1;
3237 if (TARGET_ABICALLS)
3238 warning ("-membedded-pic and -mabicalls are incompatible");
3239 if (g_switch_set)
3240 warning ("-G and -membedded-pic are incompatible");
3241 /* Setting mips_section_threshold is not required, because gas
3242 will force everything to be GP addressable anyhow, but
3243 setting it will cause gcc to make better estimates of the
3244 number of instructions required to access a particular data
3245 item. */
3246 mips_section_threshold = 0x7fffffff;
3247 }
3248
3249 /* -mrnames says to use the MIPS software convention for register
3250 names instead of the hardware names (ie, $a0 instead of $4).
3251 We do this by switching the names in mips_reg_names, which the
3252 reg_names points into via the REGISTER_NAMES macro. */
3253
3254 if (TARGET_NAME_REGS)
3255 bcopy ((char *) mips_sw_reg_names, (char *) mips_reg_names, sizeof (mips_reg_names));
3256
3257 /* If this is OSF/1, set up a SIGINFO handler so we can see what function
3258 is currently being compiled. */
3259 #ifdef SIGINFO
3260 if (getenv ("GCC_SIGINFO") != (char *)0)
3261 {
3262 struct sigaction action;
3263 action.sa_handler = siginfo;
3264 action.sa_mask = 0;
3265 action.sa_flags = SA_RESTART;
3266 sigaction (SIGINFO, &action, (struct sigaction *)0);
3267 }
3268 #endif
3269
3270 #if defined(_IOLBF)
3271 #if defined(ultrix) || defined(__ultrix) || defined(__OSF1__) || defined(__osf__) || defined(osf)
3272 /* If -mstats and -quiet, make stderr line buffered. */
3273 if (quiet_flag && TARGET_STATS)
3274 setvbuf (stderr, (char *)0, _IOLBF, BUFSIZ);
3275 #endif
3276 #endif
3277
3278 /* Initialize the high and low values for legitimate floating point
3279 constants. Rather than trying to get the accuracy down to the
3280 last bit, just use approximate ranges. */
3281 dfhigh = REAL_VALUE_ATOF ("1.0e300", DFmode);
3282 dflow = REAL_VALUE_ATOF ("1.0e-300", DFmode);
3283 sfhigh = REAL_VALUE_ATOF ("1.0e38", SFmode);
3284 sflow = REAL_VALUE_ATOF ("1.0e-38", SFmode);
3285
3286 mips_print_operand_punct['?'] = TRUE;
3287 mips_print_operand_punct['#'] = TRUE;
3288 mips_print_operand_punct['&'] = TRUE;
3289 mips_print_operand_punct['!'] = TRUE;
3290 mips_print_operand_punct['*'] = TRUE;
3291 mips_print_operand_punct['@'] = TRUE;
3292 mips_print_operand_punct['.'] = TRUE;
3293 mips_print_operand_punct['('] = TRUE;
3294 mips_print_operand_punct[')'] = TRUE;
3295 mips_print_operand_punct['['] = TRUE;
3296 mips_print_operand_punct[']'] = TRUE;
3297 mips_print_operand_punct['<'] = TRUE;
3298 mips_print_operand_punct['>'] = TRUE;
3299 mips_print_operand_punct['{'] = TRUE;
3300 mips_print_operand_punct['}'] = TRUE;
3301 mips_print_operand_punct['^'] = TRUE;
3302
3303 mips_char_to_class['d'] = GR_REGS;
3304 mips_char_to_class['f'] = ((TARGET_HARD_FLOAT) ? FP_REGS : NO_REGS);
3305 mips_char_to_class['h'] = HI_REG;
3306 mips_char_to_class['l'] = LO_REG;
3307 mips_char_to_class['x'] = MD_REGS;
3308 mips_char_to_class['y'] = GR_REGS;
3309 mips_char_to_class['z'] = ST_REGS;
3310
3311 /* Set up array to map GCC register number to debug register number.
3312 Ignore the special purpose register numbers. */
3313
3314 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
3315 mips_dbx_regno[i] = -1;
3316
3317 start = GP_DBX_FIRST - GP_REG_FIRST;
3318 for (i = GP_REG_FIRST; i <= GP_REG_LAST; i++)
3319 mips_dbx_regno[i] = i + start;
3320
3321 start = FP_DBX_FIRST - FP_REG_FIRST;
3322 for (i = FP_REG_FIRST; i <= FP_REG_LAST; i++)
3323 mips_dbx_regno[i] = i + start;
3324
3325 /* Set up array giving whether a given register can hold a given mode.
3326 At present, restrict ints from being in FP registers, because reload
3327 is a little enthusiastic about storing extra values in FP registers,
3328 and this is not good for things like OS kernels. Also, due to the
3329 mandatory delay, it is as fast to load from cached memory as to move
3330 from the FP register. */
3331
3332 for (mode = VOIDmode;
3333 mode != MAX_MACHINE_MODE;
3334 mode = (enum machine_mode)((int)mode + 1))
3335 {
3336 register int size = GET_MODE_SIZE (mode);
3337 register enum mode_class class = GET_MODE_CLASS (mode);
3338
3339 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
3340 {
3341 register int temp;
3342
3343 if (mode == CC_FPmode || mode == CC_REV_FPmode)
3344 temp = (regno == FPSW_REGNUM);
3345
3346 else if (GP_REG_P (regno))
3347 temp = ((regno & 1) == 0 || (size <= UNITS_PER_WORD));
3348
3349 else if (FP_REG_P (regno))
3350 temp = ((TARGET_FLOAT64 || ((regno & 1) == 0))
3351 && (class == MODE_FLOAT
3352 || class == MODE_COMPLEX_FLOAT
3353 || (TARGET_DEBUG_H_MODE && class == MODE_INT)));
3354
3355 else if (MD_REG_P (regno))
3356 {
3357 if (TARGET_64BIT)
3358 temp = (mode == DImode
3359 || (regno == MD_REG_FIRST && mode == TImode));
3360 else
3361 temp = (mode == SImode
3362 || (regno == MD_REG_FIRST && mode == DImode));
3363 }
3364
3365 else
3366 temp = FALSE;
3367
3368 mips_hard_regno_mode_ok[(int)mode][regno] = temp;
3369 }
3370 }
3371 }
3372
3373 \f
3374 /*
3375 * The MIPS debug format wants all automatic variables and arguments
3376 * to be in terms of the virtual frame pointer (stack pointer before
3377 * any adjustment in the function), while the MIPS 3.0 linker wants
3378 * the frame pointer to be the stack pointer after the initial
3379 * adjustment. So, we do the adjustment here. The arg pointer (which
3380 * is eliminated) points to the virtual frame pointer, while the frame
3381 * pointer (which may be eliminated) points to the stack pointer after
3382 * the initial adjustments.
3383 */
3384
3385 int
3386 mips_debugger_offset (addr, offset)
3387 rtx addr;
3388 int offset;
3389 {
3390 rtx offset2 = const0_rtx;
3391 rtx reg = eliminate_constant_term (addr, &offset2);
3392
3393 if (!offset)
3394 offset = INTVAL (offset2);
3395
3396 if (reg == stack_pointer_rtx || reg == frame_pointer_rtx)
3397 {
3398 int frame_size = (!current_frame_info.initialized)
3399 ? compute_frame_size (get_frame_size ())
3400 : current_frame_info.total_size;
3401
3402 offset = offset - frame_size;
3403 }
3404 /* sdbout_parms does not want this to crash for unrecognized cases. */
3405 #if 0
3406 else if (reg != arg_pointer_rtx)
3407 abort_with_insn (addr, "mips_debugger_offset called with non stack/frame/arg pointer.");
3408 #endif
3409
3410 return offset;
3411 }
3412
3413 \f
3414 /* A C compound statement to output to stdio stream STREAM the
3415 assembler syntax for an instruction operand X. X is an RTL
3416 expression.
3417
3418 CODE is a value that can be used to specify one of several ways
3419 of printing the operand. It is used when identical operands
3420 must be printed differently depending on the context. CODE
3421 comes from the `%' specification that was used to request
3422 printing of the operand. If the specification was just `%DIGIT'
3423 then CODE is 0; if the specification was `%LTR DIGIT' then CODE
3424 is the ASCII code for LTR.
3425
3426 If X is a register, this macro should print the register's name.
3427 The names can be found in an array `reg_names' whose type is
3428 `char *[]'. `reg_names' is initialized from `REGISTER_NAMES'.
3429
3430 When the machine description has a specification `%PUNCT' (a `%'
3431 followed by a punctuation character), this macro is called with
3432 a null pointer for X and the punctuation character for CODE.
3433
3434 The MIPS specific codes are:
3435
3436 'X' X is CONST_INT, prints 32 bits in hexadecimal format = "0x%08x",
3437 'x' X is CONST_INT, prints 16 bits in hexadecimal format = "0x%04x",
3438 'd' output integer constant in decimal,
3439 'z' if the operand is 0, use $0 instead of normal operand.
3440 'D' print second register of double-word register operand.
3441 'L' print low-order register of double-word register operand.
3442 'M' print high-order register of double-word register operand.
3443 'C' print part of opcode for a branch condition.
3444 'N' print part of opcode for a branch condition, inverted.
3445 'S' X is CODE_LABEL, print with prefix of "LS" (for embedded switch).
3446 '(' Turn on .set noreorder
3447 ')' Turn on .set reorder
3448 '[' Turn on .set noat
3449 ']' Turn on .set at
3450 '<' Turn on .set nomacro
3451 '>' Turn on .set macro
3452 '{' Turn on .set volatile (not GAS)
3453 '}' Turn on .set novolatile (not GAS)
3454 '&' Turn on .set noreorder if filling delay slots
3455 '*' Turn on both .set noreorder and .set nomacro if filling delay slots
3456 '!' Turn on .set nomacro if filling delay slots
3457 '#' Print nop if in a .set noreorder section.
3458 '?' Print 'l' if we are to use a branch likely instead of normal branch.
3459 '@' Print the name of the assembler temporary register (at or $1).
3460 '.' Print the name of the register with a hard-wired zero (zero or $0).
3461 '^' Print the name of the pic call-through register (t9 or $25). */
3462
3463 void
3464 print_operand (file, op, letter)
3465 FILE *file; /* file to write to */
3466 rtx op; /* operand to print */
3467 int letter; /* %<letter> or 0 */
3468 {
3469 register enum rtx_code code;
3470
3471 if (PRINT_OPERAND_PUNCT_VALID_P (letter))
3472 {
3473 switch (letter)
3474 {
3475 default:
3476 error ("PRINT_OPERAND: Unknown punctuation '%c'", letter);
3477 break;
3478
3479 case '?':
3480 if (mips_branch_likely)
3481 putc ('l', file);
3482 break;
3483
3484 case '@':
3485 fputs (reg_names [GP_REG_FIRST + 1], file);
3486 break;
3487
3488 case '^':
3489 fputs (reg_names [PIC_FUNCTION_ADDR_REGNUM], file);
3490 break;
3491
3492 case '.':
3493 fputs (reg_names [GP_REG_FIRST + 0], file);
3494 break;
3495
3496 case '&':
3497 if (final_sequence != 0 && set_noreorder++ == 0)
3498 fputs (".set\tnoreorder\n\t", file);
3499 break;
3500
3501 case '*':
3502 if (final_sequence != 0)
3503 {
3504 if (set_noreorder++ == 0)
3505 fputs (".set\tnoreorder\n\t", file);
3506
3507 if (set_nomacro++ == 0)
3508 fputs (".set\tnomacro\n\t", file);
3509 }
3510 break;
3511
3512 case '!':
3513 if (final_sequence != 0 && set_nomacro++ == 0)
3514 fputs ("\n\t.set\tnomacro", file);
3515 break;
3516
3517 case '#':
3518 if (set_noreorder != 0)
3519 fputs ("\n\tnop", file);
3520
3521 else if (TARGET_STATS)
3522 fputs ("\n\t#nop", file);
3523
3524 break;
3525
3526 case '(':
3527 if (set_noreorder++ == 0)
3528 fputs (".set\tnoreorder\n\t", file);
3529 break;
3530
3531 case ')':
3532 if (set_noreorder == 0)
3533 error ("internal error: %%) found without a %%( in assembler pattern");
3534
3535 else if (--set_noreorder == 0)
3536 fputs ("\n\t.set\treorder", file);
3537
3538 break;
3539
3540 case '[':
3541 if (set_noat++ == 0)
3542 fputs (".set\tnoat\n\t", file);
3543 break;
3544
3545 case ']':
3546 if (set_noat == 0)
3547 error ("internal error: %%] found without a %%[ in assembler pattern");
3548
3549 else if (--set_noat == 0)
3550 fputs ("\n\t.set\tat", file);
3551
3552 break;
3553
3554 case '<':
3555 if (set_nomacro++ == 0)
3556 fputs (".set\tnomacro\n\t", file);
3557 break;
3558
3559 case '>':
3560 if (set_nomacro == 0)
3561 error ("internal error: %%> found without a %%< in assembler pattern");
3562
3563 else if (--set_nomacro == 0)
3564 fputs ("\n\t.set\tmacro", file);
3565
3566 break;
3567
3568 case '{':
3569 if (set_volatile++ == 0)
3570 fprintf (file, "%s.set\tvolatile\n\t", (TARGET_MIPS_AS) ? "" : "#");
3571 break;
3572
3573 case '}':
3574 if (set_volatile == 0)
3575 error ("internal error: %%} found without a %%{ in assembler pattern");
3576
3577 else if (--set_volatile == 0)
3578 fprintf (file, "\n\t%s.set\tnovolatile", (TARGET_MIPS_AS) ? "" : "#");
3579
3580 break;
3581 }
3582 return;
3583 }
3584
3585 if (! op)
3586 {
3587 error ("PRINT_OPERAND null pointer");
3588 return;
3589 }
3590
3591 code = GET_CODE (op);
3592 if (letter == 'C')
3593 switch (code)
3594 {
3595 case EQ: fputs ("eq", file); break;
3596 case NE: fputs ("ne", file); break;
3597 case GT: fputs ("gt", file); break;
3598 case GE: fputs ("ge", file); break;
3599 case LT: fputs ("lt", file); break;
3600 case LE: fputs ("le", file); break;
3601 case GTU: fputs ("gtu", file); break;
3602 case GEU: fputs ("geu", file); break;
3603 case LTU: fputs ("ltu", file); break;
3604 case LEU: fputs ("leu", file); break;
3605
3606 default:
3607 abort_with_insn (op, "PRINT_OPERAND, illegal insn for %%C");
3608 }
3609
3610 else if (letter == 'N')
3611 switch (code)
3612 {
3613 case EQ: fputs ("ne", file); break;
3614 case NE: fputs ("eq", file); break;
3615 case GT: fputs ("le", file); break;
3616 case GE: fputs ("lt", file); break;
3617 case LT: fputs ("ge", file); break;
3618 case LE: fputs ("gt", file); break;
3619 case GTU: fputs ("leu", file); break;
3620 case GEU: fputs ("ltu", file); break;
3621 case LTU: fputs ("geu", file); break;
3622 case LEU: fputs ("gtu", file); break;
3623
3624 default:
3625 abort_with_insn (op, "PRINT_OPERAND, illegal insn for %%N");
3626 }
3627
3628 else if (letter == 'S')
3629 {
3630 char buffer[100];
3631
3632 ASM_GENERATE_INTERNAL_LABEL (buffer, "LS", CODE_LABEL_NUMBER (op));
3633 assemble_name (file, buffer);
3634 }
3635
3636 else if (code == REG)
3637 {
3638 register int regnum = REGNO (op);
3639
3640 if ((letter == 'M' && ! WORDS_BIG_ENDIAN)
3641 || (letter == 'L' && WORDS_BIG_ENDIAN)
3642 || letter == 'D')
3643 regnum++;
3644
3645 fprintf (file, "%s", reg_names[regnum]);
3646 }
3647
3648 else if (code == MEM)
3649 output_address (XEXP (op, 0));
3650
3651 else if (code == CONST_DOUBLE
3652 && GET_MODE_CLASS (GET_MODE (op)) == MODE_FLOAT)
3653 {
3654 REAL_VALUE_TYPE d;
3655 char s[30];
3656
3657 REAL_VALUE_FROM_CONST_DOUBLE (d, op);
3658 REAL_VALUE_TO_DECIMAL (d, "%.20e", s);
3659 fprintf (file, s);
3660 }
3661
3662 else if ((letter == 'x') && (GET_CODE(op) == CONST_INT))
3663 fprintf (file, "0x%04x", 0xffff & (INTVAL(op)));
3664
3665 else if ((letter == 'X') && (GET_CODE(op) == CONST_INT))
3666 fprintf (file, "0x%08x", INTVAL(op));
3667
3668 else if ((letter == 'd') && (GET_CODE(op) == CONST_INT))
3669 fprintf (file, "%d", (INTVAL(op)));
3670
3671 else if (letter == 'z'
3672 && (GET_CODE (op) == CONST_INT)
3673 && INTVAL (op) == 0)
3674 fputs (reg_names[GP_REG_FIRST], file);
3675
3676 else if (letter == 'd' || letter == 'x' || letter == 'X')
3677 fatal ("PRINT_OPERAND: letter %c was found & insn was not CONST_INT", letter);
3678
3679 else
3680 output_addr_const (file, op);
3681 }
3682
3683 \f
3684 /* A C compound statement to output to stdio stream STREAM the
3685 assembler syntax for an instruction operand that is a memory
3686 reference whose address is ADDR. ADDR is an RTL expression.
3687
3688 On some machines, the syntax for a symbolic address depends on
3689 the section that the address refers to. On these machines,
3690 define the macro `ENCODE_SECTION_INFO' to store the information
3691 into the `symbol_ref', and then check for it here. */
3692
3693 void
3694 print_operand_address (file, addr)
3695 FILE *file;
3696 rtx addr;
3697 {
3698 if (!addr)
3699 error ("PRINT_OPERAND_ADDRESS, null pointer");
3700
3701 else
3702 switch (GET_CODE (addr))
3703 {
3704 default:
3705 abort_with_insn (addr, "PRINT_OPERAND_ADDRESS, illegal insn #1");
3706 break;
3707
3708 case REG:
3709 if (REGNO (addr) == ARG_POINTER_REGNUM)
3710 abort_with_insn (addr, "Arg pointer not eliminated.");
3711
3712 fprintf (file, "0(%s)", reg_names [REGNO (addr)]);
3713 break;
3714
3715 case PLUS:
3716 {
3717 register rtx reg = (rtx)0;
3718 register rtx offset = (rtx)0;
3719 register rtx arg0 = XEXP (addr, 0);
3720 register rtx arg1 = XEXP (addr, 1);
3721
3722 if (GET_CODE (arg0) == REG)
3723 {
3724 reg = arg0;
3725 offset = arg1;
3726 if (GET_CODE (offset) == REG)
3727 abort_with_insn (addr, "PRINT_OPERAND_ADDRESS, 2 regs");
3728 }
3729 else if (GET_CODE (arg1) == REG)
3730 {
3731 reg = arg1;
3732 offset = arg0;
3733 }
3734 else if (CONSTANT_P (arg0) && CONSTANT_P (arg1))
3735 {
3736 output_addr_const (file, addr);
3737 break;
3738 }
3739 else
3740 abort_with_insn (addr, "PRINT_OPERAND_ADDRESS, no regs");
3741
3742 if (!CONSTANT_P (offset))
3743 abort_with_insn (addr, "PRINT_OPERAND_ADDRESS, illegal insn #2");
3744
3745 if (REGNO (reg) == ARG_POINTER_REGNUM)
3746 abort_with_insn (addr, "Arg pointer not eliminated.");
3747
3748 output_addr_const (file, offset);
3749 fprintf (file, "(%s)", reg_names [REGNO (reg)]);
3750 }
3751 break;
3752
3753 case LABEL_REF:
3754 case SYMBOL_REF:
3755 case CONST_INT:
3756 case CONST:
3757 output_addr_const (file, addr);
3758 break;
3759 }
3760 }
3761
3762 \f
3763 /* If optimizing for the global pointer, keep track of all of
3764 the externs, so that at the end of the file, we can emit
3765 the appropriate .extern declaration for them, before writing
3766 out the text section. We assume that all names passed to
3767 us are in the permanent obstack, so that they will be valid
3768 at the end of the compilation.
3769
3770 If we have -G 0, or the extern size is unknown, don't bother
3771 emitting the .externs. */
3772
3773 int
3774 mips_output_external (file, decl, name)
3775 FILE *file;
3776 tree decl;
3777 char *name;
3778 {
3779 register struct extern_list *p;
3780 int len;
3781
3782 if (TARGET_GP_OPT
3783 && ((TREE_CODE (decl)) != FUNCTION_DECL)
3784 && ((len = int_size_in_bytes (TREE_TYPE (decl))) > 0))
3785 {
3786 p = (struct extern_list *)permalloc ((long) sizeof (struct extern_list));
3787 p->next = extern_head;
3788 p->name = name;
3789 p->size = len;
3790 extern_head = p;
3791 }
3792
3793 #ifdef ASM_OUTPUT_UNDEF_FUNCTION
3794 if (TREE_CODE (decl) == FUNCTION_DECL
3795 /* ??? Don't include alloca, since gcc will always expand it
3796 inline. If we don't do this, libg++ fails to build. */
3797 && strcmp (name, "alloca")
3798 /* ??? Don't include __builtin_next_arg, because then gcc will not
3799 bootstrap under Irix 5.1. */
3800 && strcmp (name, "__builtin_next_arg"))
3801 {
3802 p = (struct extern_list *)permalloc ((long) sizeof (struct extern_list));
3803 p->next = extern_head;
3804 p->name = name;
3805 p->size = -1;
3806 extern_head = p;
3807 }
3808 #endif
3809
3810 return 0;
3811 }
3812
3813 #ifdef ASM_OUTPUT_UNDEF_FUNCTION
3814 int
3815 mips_output_external_libcall (file, name)
3816 FILE *file;
3817 char *name;
3818 {
3819 register struct extern_list *p;
3820
3821 p = (struct extern_list *)permalloc ((long) sizeof (struct extern_list));
3822 p->next = extern_head;
3823 p->name = name;
3824 p->size = -1;
3825 extern_head = p;
3826
3827 return 0;
3828 }
3829 #endif
3830
3831 \f
3832 /* Compute a string to use as a temporary file name. */
3833
3834 /* On MSDOS, write temp files in current dir
3835 because there's no place else we can expect to use. */
3836 #if __MSDOS__
3837 #ifndef P_tmpdir
3838 #define P_tmpdir "./"
3839 #endif
3840 #endif
3841
3842 static FILE *
3843 make_temp_file ()
3844 {
3845 FILE *stream;
3846 char *base = getenv ("TMPDIR");
3847 int len;
3848
3849 if (base == (char *)0)
3850 {
3851 #ifdef P_tmpdir
3852 if (access (P_tmpdir, R_OK | W_OK) == 0)
3853 base = P_tmpdir;
3854 else
3855 #endif
3856 if (access ("/usr/tmp", R_OK | W_OK) == 0)
3857 base = "/usr/tmp/";
3858 else
3859 base = "/tmp/";
3860 }
3861
3862 len = strlen (base);
3863 /* temp_filename is global, so we must use malloc, not alloca. */
3864 temp_filename = (char *) xmalloc (len + sizeof("/ctXXXXXX"));
3865 strcpy (temp_filename, base);
3866 if (len > 0 && temp_filename[len-1] != '/')
3867 temp_filename[len++] = '/';
3868
3869 strcpy (temp_filename + len, "ctXXXXXX");
3870 mktemp (temp_filename);
3871
3872 stream = fopen (temp_filename, "w+");
3873 if (!stream)
3874 pfatal_with_name (temp_filename);
3875
3876 #ifndef __MSDOS__
3877 /* In MSDOS, we cannot unlink the temporary file until we are finished using
3878 it. Otherwise, we delete it now, so that it will be gone even if the
3879 compiler happens to crash. */
3880 unlink (temp_filename);
3881 #endif
3882 return stream;
3883 }
3884
3885 \f
3886 /* Emit a new filename to a stream. If this is MIPS ECOFF, watch out
3887 for .file's that start within a function. If we are smuggling stabs, try to
3888 put out a MIPS ECOFF file and a stab. */
3889
3890 void
3891 mips_output_filename (stream, name)
3892 FILE *stream;
3893 char *name;
3894 {
3895 static int first_time = TRUE;
3896 char ltext_label_name[100];
3897
3898 if (first_time)
3899 {
3900 first_time = FALSE;
3901 SET_FILE_NUMBER ();
3902 current_function_file = name;
3903 fprintf (stream, "\t.file\t%d ", num_source_filenames);
3904 output_quoted_string (stream, name);
3905 fprintf (stream, "\n");
3906 /* This tells mips-tfile that stabs will follow. */
3907 if (!TARGET_GAS && write_symbols == DBX_DEBUG)
3908 fprintf (stream, "\t#@stabs\n");
3909 }
3910
3911 else if (write_symbols == DBX_DEBUG)
3912 {
3913 ASM_GENERATE_INTERNAL_LABEL (ltext_label_name, "Ltext", 0);
3914 fprintf (stream, "%s ", ASM_STABS_OP);
3915 output_quoted_string (stream, name);
3916 fprintf (stream, ",%d,0,0,%s\n", N_SOL, &ltext_label_name[1]);
3917 }
3918
3919 else if (name != current_function_file
3920 && strcmp (name, current_function_file) != 0)
3921 {
3922 if (inside_function && !TARGET_GAS)
3923 {
3924 if (!file_in_function_warning)
3925 {
3926 file_in_function_warning = TRUE;
3927 ignore_line_number = TRUE;
3928 warning ("MIPS ECOFF format does not allow changing filenames within functions with #line");
3929 }
3930
3931 fprintf (stream, "\t#.file\t%d ", num_source_filenames);
3932 }
3933
3934 else
3935 {
3936 SET_FILE_NUMBER ();
3937 current_function_file = name;
3938 fprintf (stream, "\t.file\t%d ", num_source_filenames);
3939 }
3940 output_quoted_string (stream, name);
3941 fprintf (stream, "\n");
3942 }
3943 }
3944
3945 \f
3946 /* Emit a linenumber. For encapsulated stabs, we need to put out a stab
3947 as well as a .loc, since it is possible that MIPS ECOFF might not be
3948 able to represent the location for inlines that come from a different
3949 file. */
3950
3951 void
3952 mips_output_lineno (stream, line)
3953 FILE *stream;
3954 int line;
3955 {
3956 if (write_symbols == DBX_DEBUG)
3957 {
3958 ++sym_lineno;
3959 fprintf (stream, "$LM%d:\n\t%s %d,0,%d,$LM%d\n",
3960 sym_lineno, ASM_STABN_OP, N_SLINE, line, sym_lineno);
3961 }
3962
3963 else
3964 {
3965 fprintf (stream, "\n\t%s.loc\t%d %d\n",
3966 (ignore_line_number) ? "#" : "",
3967 num_source_filenames, line);
3968
3969 LABEL_AFTER_LOC (stream);
3970 }
3971 }
3972
3973 \f
3974 /* If defined, a C statement to be executed just prior to the
3975 output of assembler code for INSN, to modify the extracted
3976 operands so they will be output differently.
3977
3978 Here the argument OPVEC is the vector containing the operands
3979 extracted from INSN, and NOPERANDS is the number of elements of
3980 the vector which contain meaningful data for this insn. The
3981 contents of this vector are what will be used to convert the
3982 insn template into assembler code, so you can change the
3983 assembler output by changing the contents of the vector.
3984
3985 We use it to check if the current insn needs a nop in front of it
3986 because of load delays, and also to update the delay slot
3987 statistics. */
3988
3989 /* ??? There is no real need for this function, because it never actually
3990 emits a NOP anymore. */
3991
3992 void
3993 final_prescan_insn (insn, opvec, noperands)
3994 rtx insn;
3995 rtx opvec[];
3996 int noperands;
3997 {
3998 if (dslots_number_nops > 0)
3999 {
4000 rtx pattern = PATTERN (insn);
4001 int length = get_attr_length (insn);
4002
4003 /* Do we need to emit a NOP? */
4004 if (length == 0
4005 || (mips_load_reg != (rtx)0 && reg_mentioned_p (mips_load_reg, pattern))
4006 || (mips_load_reg2 != (rtx)0 && reg_mentioned_p (mips_load_reg2, pattern))
4007 || (mips_load_reg3 != (rtx)0 && reg_mentioned_p (mips_load_reg3, pattern))
4008 || (mips_load_reg4 != (rtx)0 && reg_mentioned_p (mips_load_reg4, pattern)))
4009 fputs ("\t#nop\n", asm_out_file);
4010
4011 else
4012 dslots_load_filled++;
4013
4014 while (--dslots_number_nops > 0)
4015 fputs ("\t#nop\n", asm_out_file);
4016
4017 mips_load_reg = (rtx)0;
4018 mips_load_reg2 = (rtx)0;
4019 mips_load_reg3 = (rtx)0;
4020 mips_load_reg4 = (rtx)0;
4021 }
4022
4023 if (TARGET_STATS)
4024 {
4025 enum rtx_code code = GET_CODE (insn);
4026 if (code == JUMP_INSN || code == CALL_INSN)
4027 dslots_jump_total++;
4028 }
4029 }
4030
4031 \f
4032 /* Output at beginning of assembler file.
4033 If we are optimizing to use the global pointer, create a temporary
4034 file to hold all of the text stuff, and write it out to the end.
4035 This is needed because the MIPS assembler is evidently one pass,
4036 and if it hasn't seen the relevant .comm/.lcomm/.extern/.sdata
4037 declaration when the code is processed, it generates a two
4038 instruction sequence. */
4039
4040 void
4041 mips_asm_file_start (stream)
4042 FILE *stream;
4043 {
4044 ASM_OUTPUT_SOURCE_FILENAME (stream, main_input_filename);
4045
4046 /* Versions of the MIPS assembler before 2.20 generate errors
4047 if a branch inside of a .set noreorder section jumps to a
4048 label outside of the .set noreorder section. Revision 2.20
4049 just set nobopt silently rather than fixing the bug. */
4050
4051 if (TARGET_MIPS_AS && optimize && flag_delayed_branch)
4052 fprintf (stream, "\t.set\tnobopt\n");
4053
4054 /* Generate the pseudo ops that System V.4 wants. */
4055 #ifndef ABICALLS_ASM_OP
4056 #define ABICALLS_ASM_OP ".abicalls"
4057 #endif
4058 if (TARGET_ABICALLS)
4059 /* ??? but do not want this (or want pic0) if -non-shared? */
4060 fprintf (stream, "\t%s\n", ABICALLS_ASM_OP);
4061
4062 /* This code exists so that we can put all externs before all symbol
4063 references. This is necessary for the assembler's global pointer
4064 optimizations to work. */
4065 /* ??? Current versions of gas do not require that externs occur before
4066 symbol references. This means that this code is unnecessary when
4067 gas is being used. This gas feature hasn't been well tested as yet
4068 though. */
4069 if (TARGET_GP_OPT)
4070 {
4071 asm_out_data_file = stream;
4072 asm_out_text_file = make_temp_file ();
4073 }
4074 else
4075 asm_out_data_file = asm_out_text_file = stream;
4076
4077 print_options (stream);
4078 }
4079
4080 \f
4081 /* If we are optimizing the global pointer, emit the text section now
4082 and any small externs which did not have .comm, etc that are
4083 needed. Also, give a warning if the data area is more than 32K and
4084 -pic because 3 instructions are needed to reference the data
4085 pointers. */
4086
4087 void
4088 mips_asm_file_end (file)
4089 FILE *file;
4090 {
4091 char buffer[8192];
4092 tree name_tree;
4093 struct extern_list *p;
4094 int len;
4095
4096 if (HALF_PIC_P ())
4097 HALF_PIC_FINISH (file);
4098
4099 if (extern_head)
4100 {
4101 fputs ("\n", file);
4102
4103 for (p = extern_head; p != 0; p = p->next)
4104 {
4105 name_tree = get_identifier (p->name);
4106
4107 /* Positively ensure only one .extern for any given symbol. */
4108 if (! TREE_ASM_WRITTEN (name_tree))
4109 {
4110 TREE_ASM_WRITTEN (name_tree) = 1;
4111 #ifdef ASM_OUTPUT_UNDEF_FUNCTION
4112 if (p->size == -1)
4113 ASM_OUTPUT_UNDEF_FUNCTION (file, p->name);
4114 else
4115 #endif
4116 {
4117 fputs ("\t.extern\t", file);
4118 assemble_name (file, p->name);
4119 fprintf (file, ", %d\n", p->size);
4120 }
4121 }
4122 }
4123 }
4124
4125 if (TARGET_GP_OPT)
4126 {
4127 fprintf (file, "\n\t.text\n");
4128 rewind (asm_out_text_file);
4129 if (ferror (asm_out_text_file))
4130 fatal_io_error (temp_filename);
4131
4132 while ((len = fread (buffer, 1, sizeof (buffer), asm_out_text_file)) > 0)
4133 if (fwrite (buffer, 1, len, file) != len)
4134 pfatal_with_name (asm_file_name);
4135
4136 if (len < 0)
4137 pfatal_with_name (temp_filename);
4138
4139 if (fclose (asm_out_text_file) != 0)
4140 pfatal_with_name (temp_filename);
4141
4142 #ifdef __MSDOS__
4143 unlink (temp_filename);
4144 #endif
4145 }
4146 }
4147
4148 \f
4149 /* Emit either a label, .comm, or .lcomm directive, and mark
4150 that the symbol is used, so that we don't emit an .extern
4151 for it in mips_asm_file_end. */
4152
4153 void
4154 mips_declare_object (stream, name, init_string, final_string, size)
4155 FILE *stream;
4156 char *name;
4157 char *init_string;
4158 char *final_string;
4159 int size;
4160 {
4161 fputs (init_string, stream); /* "", "\t.comm\t", or "\t.lcomm\t" */
4162 assemble_name (stream, name);
4163 fprintf (stream, final_string, size); /* ":\n", ",%u\n", ",%u\n" */
4164
4165 if (TARGET_GP_OPT)
4166 {
4167 tree name_tree = get_identifier (name);
4168 TREE_ASM_WRITTEN (name_tree) = 1;
4169 }
4170 }
4171
4172 \f
4173 /* Output a double precision value to the assembler. If both the
4174 host and target are IEEE, emit the values in hex. */
4175
4176 void
4177 mips_output_double (stream, value)
4178 FILE *stream;
4179 REAL_VALUE_TYPE value;
4180 {
4181 #ifdef REAL_VALUE_TO_TARGET_DOUBLE
4182 long value_long[2];
4183 REAL_VALUE_TO_TARGET_DOUBLE (value, value_long);
4184
4185 fprintf (stream, "\t.word\t0x%08lx\t\t# %.20g\n\t.word\t0x%08lx\n",
4186 value_long[0], value, value_long[1]);
4187 #else
4188 fprintf (stream, "\t.double\t%.20g\n", value);
4189 #endif
4190 }
4191
4192
4193 /* Output a single precision value to the assembler. If both the
4194 host and target are IEEE, emit the values in hex. */
4195
4196 void
4197 mips_output_float (stream, value)
4198 FILE *stream;
4199 REAL_VALUE_TYPE value;
4200 {
4201 #ifdef REAL_VALUE_TO_TARGET_SINGLE
4202 long value_long;
4203 REAL_VALUE_TO_TARGET_SINGLE (value, value_long);
4204
4205 fprintf (stream, "\t.word\t0x%08lx\t\t# %.12g (float)\n", value_long, value);
4206 #else
4207 fprintf (stream, "\t.float\t%.12g\n", value);
4208 #endif
4209 }
4210
4211 \f
4212 /* Return TRUE if any register used in the epilogue is used. This to insure
4213 any insn put into the epilogue delay slots is safe. */
4214
4215 int
4216 epilogue_reg_mentioned_p (insn)
4217 rtx insn;
4218 {
4219 register char *fmt;
4220 register int i;
4221 register enum rtx_code code;
4222 register int regno;
4223
4224 if (insn == (rtx)0)
4225 return 0;
4226
4227 if (GET_CODE (insn) == LABEL_REF)
4228 return 0;
4229
4230 code = GET_CODE (insn);
4231 switch (code)
4232 {
4233 case REG:
4234 regno = REGNO (insn);
4235 if (regno == STACK_POINTER_REGNUM)
4236 return 1;
4237
4238 if (regno == FRAME_POINTER_REGNUM && frame_pointer_needed)
4239 return 1;
4240
4241 if (!call_used_regs[regno])
4242 return 1;
4243
4244 if (regno != MIPS_TEMP1_REGNUM && regno != MIPS_TEMP2_REGNUM)
4245 return 0;
4246
4247 if (!current_frame_info.initialized)
4248 compute_frame_size (get_frame_size ());
4249
4250 return (current_frame_info.total_size >= 32768);
4251
4252 case SCRATCH:
4253 case CC0:
4254 case PC:
4255 case CONST_INT:
4256 case CONST_DOUBLE:
4257 return 0;
4258 }
4259
4260 fmt = GET_RTX_FORMAT (code);
4261 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
4262 {
4263 if (fmt[i] == 'E')
4264 {
4265 register int j;
4266 for (j = XVECLEN (insn, i) - 1; j >= 0; j--)
4267 if (epilogue_reg_mentioned_p (XVECEXP (insn, i, j)))
4268 return 1;
4269 }
4270 else if (fmt[i] == 'e' && epilogue_reg_mentioned_p (XEXP (insn, i)))
4271 return 1;
4272 }
4273
4274 return 0;
4275 }
4276
4277 \f
4278 /* When generating embedded PIC code we may need to get the address of
4279 the current function. We will need it if we take the address of
4280 any symbol in the .text section. */
4281
4282 void
4283 mips_finalize_pic ()
4284 {
4285 rtx seq;
4286
4287 if (! TARGET_EMBEDDED_PIC)
4288 return;
4289 if (embedded_pic_fnaddr_rtx == NULL)
4290 return;
4291
4292 start_sequence ();
4293
4294 emit_insn (gen_get_fnaddr (embedded_pic_fnaddr_rtx,
4295 XEXP (DECL_RTL (current_function_decl), 0)));
4296
4297 seq = gen_sequence ();
4298 end_sequence ();
4299 emit_insn_after (seq, get_insns ());
4300
4301 embedded_pic_fnaddr_rtx = NULL;
4302 }
4303
4304 \f
4305 /* Return the bytes needed to compute the frame pointer from the current
4306 stack pointer.
4307
4308 Mips stack frames look like:
4309
4310 Before call After call
4311 +-----------------------+ +-----------------------+
4312 high | | | |
4313 mem. | | | |
4314 | caller's temps. | | caller's temps. |
4315 | | | |
4316 +-----------------------+ +-----------------------+
4317 | | | |
4318 | arguments on stack. | | arguments on stack. |
4319 | | | |
4320 +-----------------------+ +-----------------------+
4321 | 4 words to save | | 4 words to save |
4322 | arguments passed | | arguments passed |
4323 | in registers, even | | in registers, even |
4324 SP->| if not passed. | VFP->| if not passed. |
4325 +-----------------------+ +-----------------------+
4326 | |
4327 | fp register save |
4328 | |
4329 +-----------------------+
4330 | |
4331 | gp register save |
4332 | |
4333 +-----------------------+
4334 | |
4335 | local variables |
4336 | |
4337 +-----------------------+
4338 | |
4339 | alloca allocations |
4340 | |
4341 +-----------------------+
4342 | |
4343 | GP save for V.4 abi |
4344 | |
4345 +-----------------------+
4346 | |
4347 | arguments on stack |
4348 | |
4349 +-----------------------+
4350 | 4 words to save |
4351 | arguments passed |
4352 | in registers, even |
4353 low SP->| if not passed. |
4354 memory +-----------------------+
4355
4356 */
4357
4358 long
4359 compute_frame_size (size)
4360 int size; /* # of var. bytes allocated */
4361 {
4362 int regno;
4363 long total_size; /* # bytes that the entire frame takes up */
4364 long var_size; /* # bytes that variables take up */
4365 long args_size; /* # bytes that outgoing arguments take up */
4366 long extra_size; /* # extra bytes */
4367 long gp_reg_rounded; /* # bytes needed to store gp after rounding */
4368 long gp_reg_size; /* # bytes needed to store gp regs */
4369 long fp_reg_size; /* # bytes needed to store fp regs */
4370 long mask; /* mask of saved gp registers */
4371 long fmask; /* mask of saved fp registers */
4372 int fp_inc; /* 1 or 2 depending on the size of fp regs */
4373 long fp_bits; /* bitmask to use for each fp register */
4374
4375 gp_reg_size = 0;
4376 fp_reg_size = 0;
4377 mask = 0;
4378 fmask = 0;
4379 extra_size = MIPS_STACK_ALIGN (((TARGET_ABICALLS) ? UNITS_PER_WORD : 0));
4380 var_size = MIPS_STACK_ALIGN (size);
4381 args_size = MIPS_STACK_ALIGN (current_function_outgoing_args_size);
4382
4383 /* The MIPS 3.0 linker does not like functions that dynamically
4384 allocate the stack and have 0 for STACK_DYNAMIC_OFFSET, since it
4385 looks like we are trying to create a second frame pointer to the
4386 function, so allocate some stack space to make it happy. */
4387
4388 if (args_size == 0 && current_function_calls_alloca)
4389 args_size = 4*UNITS_PER_WORD;
4390
4391 total_size = var_size + args_size + extra_size;
4392
4393 /* Calculate space needed for gp registers. */
4394 for (regno = GP_REG_FIRST; regno <= GP_REG_LAST; regno++)
4395 {
4396 if (MUST_SAVE_REGISTER (regno))
4397 {
4398 gp_reg_size += UNITS_PER_WORD;
4399 mask |= 1L << (regno - GP_REG_FIRST);
4400 }
4401 }
4402
4403 /* Calculate space needed for fp registers. */
4404 if (TARGET_FLOAT64)
4405 {
4406 fp_inc = 1;
4407 fp_bits = 1;
4408 }
4409 else
4410 {
4411 fp_inc = 2;
4412 fp_bits = 3;
4413 }
4414
4415 for (regno = FP_REG_FIRST; regno <= FP_REG_LAST; regno += fp_inc)
4416 {
4417 if (regs_ever_live[regno] && !call_used_regs[regno])
4418 {
4419 fp_reg_size += fp_inc * UNITS_PER_FPREG;
4420 fmask |= fp_bits << (regno - FP_REG_FIRST);
4421 }
4422 }
4423
4424 gp_reg_rounded = MIPS_STACK_ALIGN (gp_reg_size);
4425 total_size += gp_reg_rounded + fp_reg_size;
4426
4427 if (total_size == extra_size)
4428 total_size = extra_size = 0;
4429 else if (TARGET_ABICALLS)
4430 {
4431 /* Add the context-pointer to the saved registers. */
4432 gp_reg_size += UNITS_PER_WORD;
4433 mask |= 1L << (PIC_OFFSET_TABLE_REGNUM - GP_REG_FIRST);
4434 total_size -= gp_reg_rounded;
4435 gp_reg_rounded = MIPS_STACK_ALIGN (gp_reg_size);
4436 total_size += gp_reg_rounded;
4437 }
4438
4439 /* Save other computed information. */
4440 current_frame_info.total_size = total_size;
4441 current_frame_info.var_size = var_size;
4442 current_frame_info.args_size = args_size;
4443 current_frame_info.extra_size = extra_size;
4444 current_frame_info.gp_reg_size = gp_reg_size;
4445 current_frame_info.fp_reg_size = fp_reg_size;
4446 current_frame_info.mask = mask;
4447 current_frame_info.fmask = fmask;
4448 current_frame_info.initialized = reload_completed;
4449 current_frame_info.num_gp = gp_reg_size / UNITS_PER_WORD;
4450 current_frame_info.num_fp = fp_reg_size / (fp_inc * UNITS_PER_FPREG);
4451
4452 if (mask)
4453 {
4454 unsigned long offset = args_size + extra_size + var_size
4455 + gp_reg_size - UNITS_PER_WORD;
4456 current_frame_info.gp_sp_offset = offset;
4457 current_frame_info.gp_save_offset = offset - total_size;
4458 }
4459 else
4460 {
4461 current_frame_info.gp_sp_offset = 0;
4462 current_frame_info.gp_save_offset = 0;
4463 }
4464
4465
4466 if (fmask)
4467 {
4468 unsigned long offset = (args_size + extra_size + var_size
4469 + gp_reg_rounded + fp_reg_size
4470 - fp_inc * UNITS_PER_FPREG);
4471 current_frame_info.fp_sp_offset = offset;
4472 current_frame_info.fp_save_offset = offset - total_size + UNITS_PER_WORD;
4473 }
4474 else
4475 {
4476 current_frame_info.fp_sp_offset = 0;
4477 current_frame_info.fp_save_offset = 0;
4478 }
4479
4480 /* Ok, we're done. */
4481 return total_size;
4482 }
4483
4484 \f
4485 /* Common code to emit the insns (or to write the instructions to a file)
4486 to save/restore registers.
4487
4488 Other parts of the code assume that MIPS_TEMP1_REGNUM (aka large_reg)
4489 is not modified within save_restore_insns. */
4490
4491 #define BITSET_P(value,bit) (((value) & (1L << (bit))) != 0)
4492
4493 static void
4494 save_restore_insns (store_p, large_reg, large_offset, file)
4495 int store_p; /* true if this is prologue */
4496 rtx large_reg; /* register holding large offset constant or NULL */
4497 long large_offset; /* large constant offset value */
4498 FILE *file; /* file to write instructions to instead of making RTL */
4499 {
4500 long mask = current_frame_info.mask;
4501 long fmask = current_frame_info.fmask;
4502 int regno;
4503 rtx base_reg_rtx;
4504 long base_offset;
4505 long gp_offset;
4506 long fp_offset;
4507 long end_offset;
4508
4509 if (frame_pointer_needed && !BITSET_P (mask, FRAME_POINTER_REGNUM - GP_REG_FIRST))
4510 abort ();
4511
4512 if (mask == 0 && fmask == 0)
4513 return;
4514
4515 /* Save registers starting from high to low. The debuggers prefer
4516 at least the return register be stored at func+4, and also it
4517 allows us not to need a nop in the epilog if at least one
4518 register is reloaded in addition to return address. */
4519
4520 /* Save GP registers if needed. */
4521 if (mask)
4522 {
4523 /* Pick which pointer to use as a base register. For small
4524 frames, just use the stack pointer. Otherwise, use a
4525 temporary register. Save 2 cycles if the save area is near
4526 the end of a large frame, by reusing the constant created in
4527 the prologue/epilogue to adjust the stack frame. */
4528
4529 gp_offset = current_frame_info.gp_sp_offset;
4530 end_offset = gp_offset - (current_frame_info.gp_reg_size - UNITS_PER_WORD);
4531
4532 if (gp_offset < 0 || end_offset < 0)
4533 fatal ("gp_offset (%ld) or end_offset (%ld) is less than zero.",
4534 gp_offset, end_offset);
4535
4536 else if (gp_offset < 32768)
4537 {
4538 base_reg_rtx = stack_pointer_rtx;
4539 base_offset = 0;
4540 }
4541
4542 else if (large_reg != (rtx)0
4543 && (((unsigned long)(large_offset - gp_offset)) < 32768)
4544 && (((unsigned long)(large_offset - end_offset)) < 32768))
4545 {
4546 base_reg_rtx = gen_rtx (REG, Pmode, MIPS_TEMP2_REGNUM);
4547 base_offset = large_offset;
4548 if (file == (FILE *)0)
4549 {
4550 if (TARGET_LONG64)
4551 emit_insn (gen_adddi3 (base_reg_rtx, large_reg, stack_pointer_rtx));
4552 else
4553 emit_insn (gen_addsi3 (base_reg_rtx, large_reg, stack_pointer_rtx));
4554 }
4555 else
4556 fprintf (file, "\t%s\t%s,%s,%s\n",
4557 TARGET_LONG64 ? "daddu" : "addu",
4558 reg_names[MIPS_TEMP2_REGNUM],
4559 reg_names[REGNO (large_reg)],
4560 reg_names[STACK_POINTER_REGNUM]);
4561 }
4562
4563 else
4564 {
4565 base_reg_rtx = gen_rtx (REG, Pmode, MIPS_TEMP2_REGNUM);
4566 base_offset = gp_offset;
4567 if (file == (FILE *)0)
4568 {
4569 emit_move_insn (base_reg_rtx, GEN_INT (gp_offset));
4570 if (TARGET_LONG64)
4571 emit_insn (gen_adddi3 (base_reg_rtx, base_reg_rtx, stack_pointer_rtx));
4572 else
4573 emit_insn (gen_addsi3 (base_reg_rtx, base_reg_rtx, stack_pointer_rtx));
4574 }
4575 else
4576 fprintf (file, "\tli\t%s,0x%.08lx\t# %ld\n\t%s\t%s,%s,%s\n",
4577 reg_names[MIPS_TEMP2_REGNUM],
4578 (long)base_offset,
4579 (long)base_offset,
4580 TARGET_LONG64 ? "daddu" : "addu",
4581 reg_names[MIPS_TEMP2_REGNUM],
4582 reg_names[MIPS_TEMP2_REGNUM],
4583 reg_names[STACK_POINTER_REGNUM]);
4584 }
4585
4586 for (regno = GP_REG_LAST; regno >= GP_REG_FIRST; regno--)
4587 {
4588 if (BITSET_P (mask, regno - GP_REG_FIRST))
4589 {
4590 if (file == (FILE *)0)
4591 {
4592 rtx reg_rtx = gen_rtx (REG, word_mode, regno);
4593 rtx mem_rtx = gen_rtx (MEM, word_mode,
4594 gen_rtx (PLUS, Pmode, base_reg_rtx,
4595 GEN_INT (gp_offset - base_offset)));
4596
4597 if (store_p)
4598 emit_move_insn (mem_rtx, reg_rtx);
4599 else if (!TARGET_ABICALLS
4600 || regno != (PIC_OFFSET_TABLE_REGNUM - GP_REG_FIRST))
4601 emit_move_insn (reg_rtx, mem_rtx);
4602 }
4603 else
4604 {
4605 if (store_p || !TARGET_ABICALLS
4606 || regno != (PIC_OFFSET_TABLE_REGNUM - GP_REG_FIRST))
4607 fprintf (file, "\t%s\t%s,%ld(%s)\n",
4608 (TARGET_64BIT
4609 ? (store_p) ? "sd" : "ld"
4610 : (store_p) ? "sw" : "lw"),
4611 reg_names[regno],
4612 gp_offset - base_offset,
4613 reg_names[REGNO(base_reg_rtx)]);
4614
4615 }
4616 gp_offset -= UNITS_PER_WORD;
4617 }
4618 }
4619 }
4620 else
4621 {
4622 base_reg_rtx = (rtx)0; /* Make sure these are initialzed */
4623 base_offset = 0;
4624 }
4625
4626 /* Save floating point registers if needed. */
4627 if (fmask)
4628 {
4629 int fp_inc = (TARGET_FLOAT64) ? 1 : 2;
4630 int fp_size = fp_inc * UNITS_PER_FPREG;
4631
4632 /* Pick which pointer to use as a base register. */
4633 fp_offset = current_frame_info.fp_sp_offset;
4634 end_offset = fp_offset - (current_frame_info.fp_reg_size - fp_size);
4635
4636 if (fp_offset < 0 || end_offset < 0)
4637 fatal ("fp_offset (%ld) or end_offset (%ld) is less than zero.",
4638 fp_offset, end_offset);
4639
4640 else if (fp_offset < 32768)
4641 {
4642 base_reg_rtx = stack_pointer_rtx;
4643 base_offset = 0;
4644 }
4645
4646 else if (base_reg_rtx != (rtx)0
4647 && (((unsigned long)(base_offset - fp_offset)) < 32768)
4648 && (((unsigned long)(base_offset - end_offset)) < 32768))
4649 {
4650 ; /* already set up for gp registers above */
4651 }
4652
4653 else if (large_reg != (rtx)0
4654 && (((unsigned long)(large_offset - fp_offset)) < 32768)
4655 && (((unsigned long)(large_offset - end_offset)) < 32768))
4656 {
4657 base_reg_rtx = gen_rtx (REG, Pmode, MIPS_TEMP2_REGNUM);
4658 base_offset = large_offset;
4659 if (file == (FILE *)0)
4660 {
4661 if (TARGET_LONG64)
4662 emit_insn (gen_adddi3 (base_reg_rtx, large_reg, stack_pointer_rtx));
4663 else
4664 emit_insn (gen_addsi3 (base_reg_rtx, large_reg, stack_pointer_rtx));
4665 }
4666 else
4667 fprintf (file, "\t%s\t%s,%s,%s\n",
4668 TARGET_LONG64 ? "daddu" : "addu",
4669 reg_names[MIPS_TEMP2_REGNUM],
4670 reg_names[REGNO (large_reg)],
4671 reg_names[STACK_POINTER_REGNUM]);
4672 }
4673
4674 else
4675 {
4676 base_reg_rtx = gen_rtx (REG, Pmode, MIPS_TEMP2_REGNUM);
4677 base_offset = fp_offset;
4678 if (file == (FILE *)0)
4679 {
4680 emit_move_insn (base_reg_rtx, GEN_INT (fp_offset));
4681 if (TARGET_LONG64)
4682 emit_insn (gen_adddi3 (base_reg_rtx, base_reg_rtx, stack_pointer_rtx));
4683 else
4684 emit_insn (gen_addsi3 (base_reg_rtx, base_reg_rtx, stack_pointer_rtx));
4685 }
4686 else
4687 fprintf (file, "\tli\t%s,0x%.08lx\t# %ld\n\t%s\t%s,%s,%s\n",
4688 reg_names[MIPS_TEMP2_REGNUM],
4689 (long)base_offset,
4690 (long)base_offset,
4691 TARGET_LONG64 ? "daddu" : "addu",
4692 reg_names[MIPS_TEMP2_REGNUM],
4693 reg_names[MIPS_TEMP2_REGNUM],
4694 reg_names[STACK_POINTER_REGNUM]);
4695 }
4696
4697 for (regno = FP_REG_LAST-1; regno >= FP_REG_FIRST; regno -= fp_inc)
4698 {
4699 if (BITSET_P (fmask, regno - FP_REG_FIRST))
4700 {
4701 if (file == (FILE *)0)
4702 {
4703 rtx reg_rtx = gen_rtx (REG, DFmode, regno);
4704 rtx mem_rtx = gen_rtx (MEM, DFmode,
4705 gen_rtx (PLUS, Pmode, base_reg_rtx,
4706 GEN_INT (fp_offset - base_offset)));
4707
4708 if (store_p)
4709 emit_move_insn (mem_rtx, reg_rtx);
4710 else
4711 emit_move_insn (reg_rtx, mem_rtx);
4712 }
4713 else
4714 fprintf (file, "\t%s\t%s,%ld(%s)\n",
4715 (store_p) ? "s.d" : "l.d",
4716 reg_names[regno],
4717 fp_offset - base_offset,
4718 reg_names[REGNO(base_reg_rtx)]);
4719
4720
4721 fp_offset -= fp_size;
4722 }
4723 }
4724 }
4725 }
4726
4727 \f
4728 /* Set up the stack and frame (if desired) for the function. */
4729
4730 void
4731 function_prologue (file, size)
4732 FILE *file;
4733 int size;
4734 {
4735 long tsize = current_frame_info.total_size;
4736
4737 ASM_OUTPUT_SOURCE_FILENAME (file, DECL_SOURCE_FILE (current_function_decl));
4738
4739 if (debug_info_level != DINFO_LEVEL_TERSE && write_symbols == SDB_DEBUG)
4740 ASM_OUTPUT_SOURCE_LINE (file, DECL_SOURCE_LINE (current_function_decl));
4741
4742 inside_function = 1;
4743 fputs ("\t.ent\t", file);
4744 assemble_name (file, current_function_name);
4745 fputs ("\n", file);
4746
4747 assemble_name (file, current_function_name);
4748 fputs (":\n", file);
4749
4750 fprintf (file, "\t.frame\t%s,%d,%s\t\t# vars= %d, regs= %d/%d, args= %d, extra= %d\n",
4751 reg_names[ (frame_pointer_needed) ? FRAME_POINTER_REGNUM : STACK_POINTER_REGNUM ],
4752 tsize,
4753 reg_names[31 + GP_REG_FIRST],
4754 current_frame_info.var_size,
4755 current_frame_info.num_gp,
4756 current_frame_info.num_fp,
4757 current_function_outgoing_args_size,
4758 current_frame_info.extra_size);
4759
4760 fprintf (file, "\t.mask\t0x%08lx,%d\n\t.fmask\t0x%08lx,%d\n",
4761 current_frame_info.mask,
4762 current_frame_info.gp_save_offset,
4763 current_frame_info.fmask,
4764 current_frame_info.fp_save_offset);
4765
4766 if (TARGET_ABICALLS)
4767 {
4768 char *sp_str = reg_names[STACK_POINTER_REGNUM];
4769
4770 fprintf (file, "\t.set\tnoreorder\n\t.cpload\t%s\n\t.set\treorder\n",
4771 reg_names[PIC_FUNCTION_ADDR_REGNUM]);
4772 if (tsize > 0)
4773 {
4774 fprintf (file, "\t%s\t%s,%s,%d\n",
4775 (TARGET_LONG64 ? "dsubu" : "subu"),
4776 sp_str, sp_str, tsize);
4777 fprintf (file, "\t.cprestore %d\n", current_frame_info.args_size);
4778 }
4779 }
4780 }
4781
4782 \f
4783 /* Expand the prologue into a bunch of separate insns. */
4784
4785 void
4786 mips_expand_prologue ()
4787 {
4788 int regno;
4789 long tsize;
4790 rtx tmp_rtx = (rtx)0;
4791 char *arg_name = (char *)0;
4792 tree fndecl = current_function_decl;
4793 tree fntype = TREE_TYPE (fndecl);
4794 tree fnargs = (TREE_CODE (fntype) != METHOD_TYPE)
4795 ? DECL_ARGUMENTS (fndecl)
4796 : 0;
4797 rtx next_arg_reg;
4798 int i;
4799 tree next_arg;
4800 tree cur_arg;
4801 CUMULATIVE_ARGS args_so_far;
4802
4803 /* If struct value address is treated as the first argument, make it so. */
4804 if (aggregate_value_p (DECL_RESULT (fndecl))
4805 && ! current_function_returns_pcc_struct
4806 && struct_value_incoming_rtx == 0)
4807 {
4808 tree type = build_pointer_type (fntype);
4809 tree function_result_decl = build_decl (PARM_DECL, NULL_TREE, type);
4810 DECL_ARG_TYPE (function_result_decl) = type;
4811 TREE_CHAIN (function_result_decl) = fnargs;
4812 fnargs = function_result_decl;
4813 }
4814
4815 /* Determine the last argument, and get its name. */
4816
4817 INIT_CUMULATIVE_ARGS (args_so_far, fntype, (rtx)0);
4818 regno = GP_ARG_FIRST;
4819
4820 for (cur_arg = fnargs; cur_arg != (tree)0; cur_arg = next_arg)
4821 {
4822 tree passed_type = DECL_ARG_TYPE (cur_arg);
4823 enum machine_mode passed_mode = TYPE_MODE (passed_type);
4824 rtx entry_parm;
4825
4826 if (TYPE_NEEDS_CONSTRUCTING (passed_type))
4827 {
4828 passed_type = build_pointer_type (passed_type);
4829 passed_mode = Pmode;
4830 }
4831
4832 entry_parm = FUNCTION_ARG (args_so_far, passed_mode, passed_type, 1);
4833
4834 if (entry_parm)
4835 {
4836 int words;
4837
4838 /* passed in a register, so will get homed automatically */
4839 if (GET_MODE (entry_parm) == BLKmode)
4840 words = (int_size_in_bytes (passed_type) + 3) / 4;
4841 else
4842 words = (GET_MODE_SIZE (GET_MODE (entry_parm)) + 3) / 4;
4843
4844 regno = REGNO (entry_parm) + words - 1;
4845 }
4846 else
4847 {
4848 regno = GP_ARG_LAST+1;
4849 break;
4850 }
4851
4852 FUNCTION_ARG_ADVANCE (args_so_far, passed_mode, passed_type, 1);
4853
4854 next_arg = TREE_CHAIN (cur_arg);
4855 if (next_arg == (tree)0)
4856 {
4857 if (DECL_NAME (cur_arg))
4858 arg_name = IDENTIFIER_POINTER (DECL_NAME (cur_arg));
4859
4860 break;
4861 }
4862 }
4863
4864 /* In order to pass small structures by value in registers
4865 compatibly with the MIPS compiler, we need to shift the value
4866 into the high part of the register. Function_arg has encoded a
4867 PARALLEL rtx, holding a vector of adjustments to be made as the
4868 next_arg_reg variable, so we split up the insns, and emit them
4869 separately. */
4870
4871 next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1);
4872 if (next_arg_reg != (rtx)0 && GET_CODE (next_arg_reg) == PARALLEL)
4873 {
4874 rtvec adjust = XVEC (next_arg_reg, 0);
4875 int num = GET_NUM_ELEM (adjust);
4876
4877 for (i = 0; i < num; i++)
4878 {
4879 rtx pattern = RTVEC_ELT (adjust, i);
4880 if (GET_CODE (pattern) != SET
4881 || GET_CODE (SET_SRC (pattern)) != ASHIFT)
4882 abort_with_insn (pattern, "Insn is not a shift");
4883
4884 PUT_CODE (SET_SRC (pattern), ASHIFTRT);
4885 emit_insn (pattern);
4886 }
4887 }
4888
4889 tsize = compute_frame_size (get_frame_size ());
4890
4891 /* If this function is a varargs function, store any registers that
4892 would normally hold arguments ($4 - $7) on the stack. */
4893 if ((TYPE_ARG_TYPES (fntype) != 0
4894 && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype))) != void_type_node))
4895 || (arg_name != (char *)0
4896 && ((arg_name[0] == '_' && strcmp (arg_name, "__builtin_va_alist") == 0)
4897 || (arg_name[0] == 'v' && strcmp (arg_name, "va_alist") == 0))))
4898 {
4899 int offset = (regno - GP_ARG_FIRST) * UNITS_PER_WORD;
4900 rtx ptr = stack_pointer_rtx;
4901
4902 /* If we are doing svr4-abi, sp has already been decremented by tsize. */
4903 if (TARGET_ABICALLS)
4904 offset += tsize;
4905
4906 for (; regno <= GP_ARG_LAST; regno++)
4907 {
4908 if (offset != 0)
4909 ptr = gen_rtx (PLUS, Pmode, stack_pointer_rtx, GEN_INT (offset));
4910 emit_move_insn (gen_rtx (MEM, word_mode, ptr),
4911 gen_rtx (REG, word_mode, regno));
4912 offset += UNITS_PER_WORD;
4913 }
4914 }
4915
4916 if (tsize > 0)
4917 {
4918 rtx tsize_rtx = GEN_INT (tsize);
4919
4920 /* If we are doing svr4-abi, sp move is done by function_prologue. */
4921 if (!TARGET_ABICALLS)
4922 {
4923 if (tsize > 32767)
4924 {
4925 tmp_rtx = gen_rtx (REG, Pmode, MIPS_TEMP1_REGNUM);
4926 emit_move_insn (tmp_rtx, tsize_rtx);
4927 tsize_rtx = tmp_rtx;
4928 }
4929
4930 if (TARGET_LONG64)
4931 emit_insn (gen_subdi3 (stack_pointer_rtx, stack_pointer_rtx,
4932 tsize_rtx));
4933 else
4934 emit_insn (gen_subsi3 (stack_pointer_rtx, stack_pointer_rtx,
4935 tsize_rtx));
4936 }
4937
4938 save_restore_insns (TRUE, tmp_rtx, tsize, (FILE *)0);
4939
4940 if (frame_pointer_needed)
4941 {
4942 if (TARGET_64BIT)
4943 emit_insn (gen_movdi (frame_pointer_rtx, stack_pointer_rtx));
4944 else
4945 emit_insn (gen_movsi (frame_pointer_rtx, stack_pointer_rtx));
4946 }
4947 }
4948
4949 /* If we are profiling, make sure no instructions are scheduled before
4950 the call to mcount. */
4951
4952 if (profile_flag || profile_block_flag)
4953 emit_insn (gen_blockage ());
4954 }
4955
4956 \f
4957 /* Do any necessary cleanup after a function to restore stack, frame, and regs. */
4958
4959 #define RA_MASK ((long) 0x80000000) /* 1 << 31 */
4960 #define PIC_OFFSET_TABLE_MASK (1 << (PIC_OFFSET_TABLE_REGNUM - GP_REG_FIRST))
4961
4962 void
4963 function_epilogue (file, size)
4964 FILE *file;
4965 int size;
4966 {
4967 long tsize;
4968 char *sp_str = reg_names[STACK_POINTER_REGNUM];
4969 char *t1_str = reg_names[MIPS_TEMP1_REGNUM];
4970 rtx epilogue_delay = current_function_epilogue_delay_list;
4971 int noreorder = (epilogue_delay != 0);
4972 int noepilogue = FALSE;
4973 int load_nop = FALSE;
4974 int load_only_r31;
4975 rtx tmp_rtx = (rtx)0;
4976 rtx restore_rtx;
4977 int i;
4978
4979 /* The epilogue does not depend on any registers, but the stack
4980 registers, so we assume that if we have 1 pending nop, it can be
4981 ignored, and 2 it must be filled (2 nops occur for integer
4982 multiply and divide). */
4983
4984 if (dslots_number_nops > 0)
4985 {
4986 if (dslots_number_nops == 1)
4987 {
4988 dslots_number_nops = 0;
4989 dslots_load_filled++;
4990 }
4991 else
4992 {
4993 while (--dslots_number_nops > 0)
4994 fputs ("\t#nop\n", asm_out_file);
4995 }
4996 }
4997
4998 if (set_noat != 0)
4999 {
5000 set_noat = 0;
5001 fputs ("\t.set\tat\n", file);
5002 error ("internal gcc error: .set noat left on in epilogue");
5003 }
5004
5005 if (set_nomacro != 0)
5006 {
5007 set_nomacro = 0;
5008 fputs ("\t.set\tmacro\n", file);
5009 error ("internal gcc error: .set nomacro left on in epilogue");
5010 }
5011
5012 if (set_noreorder != 0)
5013 {
5014 set_noreorder = 0;
5015 fputs ("\t.set\treorder\n", file);
5016 error ("internal gcc error: .set noreorder left on in epilogue");
5017 }
5018
5019 if (set_volatile != 0)
5020 {
5021 set_volatile = 0;
5022 fprintf (file, "\t%s.set\tnovolatile\n", (TARGET_MIPS_AS) ? "" : "#");
5023 error ("internal gcc error: .set volatile left on in epilogue");
5024 }
5025
5026 size = MIPS_STACK_ALIGN (size);
5027 tsize = (!current_frame_info.initialized)
5028 ? compute_frame_size (size)
5029 : current_frame_info.total_size;
5030
5031 if (tsize == 0 && epilogue_delay == 0)
5032 {
5033 rtx insn = get_last_insn ();
5034
5035 /* If the last insn was a BARRIER, we don't have to write any code
5036 because a jump (aka return) was put there. */
5037 if (GET_CODE (insn) == NOTE)
5038 insn = prev_nonnote_insn (insn);
5039 if (insn && GET_CODE (insn) == BARRIER)
5040 noepilogue = TRUE;
5041
5042 noreorder = FALSE;
5043 }
5044
5045 if (!noepilogue)
5046 {
5047 /* In the reload sequence, we don't need to fill the load delay
5048 slots for most of the loads, also see if we can fill the final
5049 delay slot if not otherwise filled by the reload sequence. */
5050
5051 if (noreorder)
5052 fprintf (file, "\t.set\tnoreorder\n");
5053
5054 if (tsize > 32767)
5055 {
5056 fprintf (file, "\tli\t%s,0x%.08lx\t# %ld\n", t1_str, (long)tsize, (long)tsize);
5057 tmp_rtx = gen_rtx (REG, Pmode, MIPS_TEMP1_REGNUM);
5058 }
5059
5060 if (frame_pointer_needed)
5061 fprintf (file, "\tmove\t%s,%s\t\t\t# sp not trusted here\n",
5062 sp_str, reg_names[FRAME_POINTER_REGNUM]);
5063
5064 save_restore_insns (FALSE, tmp_rtx, tsize, file);
5065
5066 load_only_r31 = (((current_frame_info.mask
5067 & ~ (TARGET_ABICALLS ? PIC_OFFSET_TABLE_MASK : 0))
5068 == RA_MASK)
5069 && current_frame_info.fmask == 0);
5070
5071 if (noreorder)
5072 {
5073 /* If the only register saved is the return address, we need a
5074 nop, unless we have an instruction to put into it. Otherwise
5075 we don't since reloading multiple registers doesn't reference
5076 the register being loaded. */
5077
5078 if (load_only_r31)
5079 {
5080 if (epilogue_delay)
5081 final_scan_insn (XEXP (epilogue_delay, 0),
5082 file,
5083 1, /* optimize */
5084 -2, /* prescan */
5085 1); /* nopeepholes */
5086 else
5087 {
5088 fprintf (file, "\tnop\n");
5089 load_nop = TRUE;
5090 }
5091 }
5092
5093 fprintf (file, "\tj\t%s\n", reg_names[GP_REG_FIRST + 31]);
5094
5095 if (tsize > 32767)
5096 fprintf (file, "\t%s\t%s,%s,%s\n",
5097 TARGET_LONG64 ? "daddu" : "addu",
5098 sp_str, sp_str, t1_str);
5099
5100 else if (tsize > 0)
5101 fprintf (file, "\t%s\t%s,%s,%d\n",
5102 TARGET_LONG64 ? "daddu" : "addu",
5103 sp_str, sp_str, tsize);
5104
5105 else if (!load_only_r31 && epilogue_delay != 0)
5106 final_scan_insn (XEXP (epilogue_delay, 0),
5107 file,
5108 1, /* optimize */
5109 -2, /* prescan */
5110 1); /* nopeepholes */
5111
5112 fprintf (file, "\t.set\treorder\n");
5113 }
5114
5115 else
5116 {
5117 if (tsize > 32767)
5118 fprintf (file, "\t%s\t%s,%s,%s\n",
5119 TARGET_LONG64 ? "daddu" : "addu",
5120 sp_str, sp_str, t1_str);
5121
5122 else if (tsize > 0)
5123 fprintf (file, "\t%s\t%s,%s,%d\n",
5124 TARGET_LONG64 ? "daddu" : "addu",
5125 sp_str, sp_str, tsize);
5126
5127 fprintf (file, "\tj\t%s\n", reg_names[GP_REG_FIRST + 31]);
5128 }
5129 }
5130
5131 fputs ("\t.end\t", file);
5132 assemble_name (file, current_function_name);
5133 fputs ("\n", file);
5134
5135 if (TARGET_STATS)
5136 {
5137 int num_gp_regs = current_frame_info.gp_reg_size / 4;
5138 int num_fp_regs = current_frame_info.fp_reg_size / 8;
5139 int num_regs = num_gp_regs + num_fp_regs;
5140 char *name = current_function_name;
5141
5142 if (name[0] == '*')
5143 name++;
5144
5145 dslots_load_total += num_regs;
5146
5147 if (!noepilogue)
5148 dslots_jump_total++;
5149
5150 if (noreorder)
5151 {
5152 dslots_load_filled += num_regs;
5153
5154 /* If the only register saved is the return register, we
5155 can't fill this register's delay slot. */
5156
5157 if (load_only_r31 && epilogue_delay == 0)
5158 dslots_load_filled--;
5159
5160 if (tsize > 0 || (!load_only_r31 && epilogue_delay != 0))
5161 dslots_jump_filled++;
5162 }
5163
5164 fprintf (stderr,
5165 "%-20s fp=%c leaf=%c alloca=%c setjmp=%c stack=%4ld arg=%3ld reg=%2d/%d delay=%3d/%3dL %3d/%3dJ refs=%3d/%3d/%3d",
5166 name,
5167 (frame_pointer_needed) ? 'y' : 'n',
5168 ((current_frame_info.mask & RA_MASK) != 0) ? 'n' : 'y',
5169 (current_function_calls_alloca) ? 'y' : 'n',
5170 (current_function_calls_setjmp) ? 'y' : 'n',
5171 (long)current_frame_info.total_size,
5172 (long)current_function_outgoing_args_size,
5173 num_gp_regs, num_fp_regs,
5174 dslots_load_total, dslots_load_filled,
5175 dslots_jump_total, dslots_jump_filled,
5176 num_refs[0], num_refs[1], num_refs[2]);
5177
5178 if (HALF_PIC_NUMBER_PTRS > prev_half_pic_ptrs)
5179 {
5180 fprintf (stderr, " half-pic=%3d", HALF_PIC_NUMBER_PTRS - prev_half_pic_ptrs);
5181 prev_half_pic_ptrs = HALF_PIC_NUMBER_PTRS;
5182 }
5183
5184 if (HALF_PIC_NUMBER_REFS > prev_half_pic_refs)
5185 {
5186 fprintf (stderr, " pic-ref=%3d", HALF_PIC_NUMBER_REFS - prev_half_pic_refs);
5187 prev_half_pic_refs = HALF_PIC_NUMBER_REFS;
5188 }
5189
5190 fputc ('\n', stderr);
5191 }
5192
5193 /* Reset state info for each function. */
5194 inside_function = FALSE;
5195 ignore_line_number = FALSE;
5196 dslots_load_total = 0;
5197 dslots_jump_total = 0;
5198 dslots_load_filled = 0;
5199 dslots_jump_filled = 0;
5200 num_refs[0] = 0;
5201 num_refs[1] = 0;
5202 num_refs[2] = 0;
5203 mips_load_reg = (rtx)0;
5204 mips_load_reg2 = (rtx)0;
5205 current_frame_info = zero_frame_info;
5206
5207 /* Restore the output file if optimizing the GP (optimizing the GP causes
5208 the text to be diverted to a tempfile, so that data decls come before
5209 references to the data). */
5210
5211 if (TARGET_GP_OPT)
5212 asm_out_file = asm_out_data_file;
5213 }
5214
5215 \f
5216 /* Expand the epilogue into a bunch of separate insns. */
5217
5218 void
5219 mips_expand_epilogue ()
5220 {
5221 long tsize = current_frame_info.total_size;
5222 rtx tsize_rtx = GEN_INT (tsize);
5223 rtx tmp_rtx = (rtx)0;
5224
5225 if (tsize > 32767)
5226 {
5227 tmp_rtx = gen_rtx (REG, Pmode, MIPS_TEMP1_REGNUM);
5228 emit_move_insn (tmp_rtx, tsize_rtx);
5229 tsize_rtx = tmp_rtx;
5230 }
5231
5232 if (tsize > 0)
5233 {
5234 if (frame_pointer_needed)
5235 {
5236 if (TARGET_LONG64)
5237 emit_insn (gen_movdi (stack_pointer_rtx, frame_pointer_rtx));
5238 else
5239 emit_insn (gen_movsi (stack_pointer_rtx, frame_pointer_rtx));
5240 }
5241
5242 save_restore_insns (FALSE, tmp_rtx, tsize, (FILE *)0);
5243
5244 if (TARGET_LONG64)
5245 emit_insn (gen_adddi3 (stack_pointer_rtx, stack_pointer_rtx,
5246 tsize_rtx));
5247 else
5248 emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
5249 tsize_rtx));
5250 }
5251
5252 emit_jump_insn (gen_return_internal (gen_rtx (REG, Pmode, GP_REG_FIRST+31)));
5253 }
5254
5255 \f
5256 /* Define the number of delay slots needed for the function epilogue.
5257
5258 On the mips, we need a slot if either no stack has been allocated,
5259 or the only register saved is the return register. */
5260
5261 int
5262 mips_epilogue_delay_slots ()
5263 {
5264 if (!current_frame_info.initialized)
5265 (void) compute_frame_size (get_frame_size ());
5266
5267 if (current_frame_info.total_size == 0)
5268 return 1;
5269
5270 if (current_frame_info.mask == RA_MASK && current_frame_info.fmask == 0)
5271 return 1;
5272
5273 return 0;
5274 }
5275
5276 \f
5277 /* Return true if this function is known to have a null epilogue.
5278 This allows the optimizer to omit jumps to jumps if no stack
5279 was created. */
5280
5281 int
5282 simple_epilogue_p ()
5283 {
5284 if (!reload_completed)
5285 return 0;
5286
5287 if (current_frame_info.initialized)
5288 return current_frame_info.total_size == 0;
5289
5290 return (compute_frame_size (get_frame_size ())) == 0;
5291 }
5292 \f
5293 /* Choose the section to use for the constant rtx expression X that has
5294 mode MODE. */
5295
5296 mips_select_rtx_section (mode, x)
5297 enum machine_mode mode;
5298 rtx x;
5299 {
5300 if (TARGET_EMBEDDED_DATA)
5301 {
5302 /* For embedded applications, always put constants in read-only data,
5303 in order to reduce RAM usage. */
5304 rdata_section ();
5305 }
5306 else
5307 {
5308 /* For hosted applications, always put constants in small data if
5309 possible, as this gives the best performance. */
5310
5311 if (GET_MODE_SIZE (mode) <= mips_section_threshold
5312 && mips_section_threshold > 0)
5313 sdata_section ();
5314 else
5315 rdata_section ();
5316 }
5317 }
5318
5319 /* Choose the section to use for DECL. RELOC is true if its value contains
5320 any relocatable expression. */
5321
5322 mips_select_section (decl, reloc)
5323 tree decl;
5324 int reloc;
5325 {
5326 int size = int_size_in_bytes (TREE_TYPE (decl));
5327
5328 if (TARGET_EMBEDDED_PIC
5329 && TREE_CODE (decl) == STRING_CST
5330 && !flag_writable_strings)
5331 {
5332 /* For embedded position independent code, put constant strings
5333 in the text section, because the data section is limited to
5334 64K in size. */
5335
5336 text_section ();
5337 }
5338 else if (TARGET_EMBEDDED_DATA)
5339 {
5340 /* For embedded applications, always put an object in read-only data
5341 if possible, in order to reduce RAM usage. */
5342
5343 if (((TREE_READONLY (decl) && !TREE_SIDE_EFFECTS (decl)
5344 && DECL_INITIAL (decl)
5345 && (DECL_INITIAL (decl) == error_mark_node
5346 || TREE_CONSTANT (DECL_INITIAL (decl))))
5347 /* Deal with calls from output_constant_def_contents. */
5348 || (TREE_CODE (decl) != VAR_DECL
5349 && (TREE_CODE (decl) != STRING_CST
5350 || !flag_writable_strings)))
5351 && ! (flag_pic && reloc))
5352 rdata_section ();
5353 else if (size > 0 && size <= mips_section_threshold)
5354 sdata_section ();
5355 else
5356 data_section ();
5357 }
5358 else
5359 {
5360 /* For hosted applications, always put an object in small data if
5361 possible, as this gives the best performance. */
5362
5363 if (size > 0 && size <= mips_section_threshold)
5364 sdata_section ();
5365 else if (((TREE_READONLY (decl) && !TREE_SIDE_EFFECTS (decl)
5366 && DECL_INITIAL (decl)
5367 && (DECL_INITIAL (decl) == error_mark_node
5368 || TREE_CONSTANT (DECL_INITIAL (decl))))
5369 /* Deal with calls from output_constant_def_contents. */
5370 || (TREE_CODE (decl) != VAR_DECL
5371 && (TREE_CODE (decl) != STRING_CST
5372 || !flag_writable_strings)))
5373 && ! (flag_pic && reloc))
5374 rdata_section ();
5375 else
5376 data_section ();
5377 }
5378 }