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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [targhooks.c] - Blame information for rev 816

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1 280 jeremybenn
/* Default target hook functions.
2
   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
3
   Free Software Foundation, Inc.
4
 
5
This file is part of GCC.
6
 
7
GCC is free software; you can redistribute it and/or modify it under
8
the terms of the GNU General Public License as published by the Free
9
Software Foundation; either version 3, or (at your option) any later
10
version.
11
 
12
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13
WARRANTY; without even the implied warranty of MERCHANTABILITY or
14
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15
for more details.
16
 
17
You should have received a copy of the GNU General Public License
18
along with GCC; see the file COPYING3.  If not see
19
<http://www.gnu.org/licenses/>.  */
20
 
21
/* The migration of target macros to target hooks works as follows:
22
 
23
   1. Create a target hook that uses the existing target macros to
24
      implement the same functionality.
25
 
26
   2. Convert all the MI files to use the hook instead of the macro.
27
 
28
   3. Repeat for a majority of the remaining target macros.  This will
29
      take some time.
30
 
31
   4. Tell target maintainers to start migrating.
32
 
33
   5. Eventually convert the backends to override the hook instead of
34
      defining the macros.  This will take some time too.
35
 
36
   6. TBD when, poison the macros.  Unmigrated targets will break at
37
      this point.
38
 
39
   Note that we expect steps 1-3 to be done by the people that
40
   understand what the MI does with each macro, and step 5 to be done
41
   by the target maintainers for their respective targets.
42
 
43
   Note that steps 1 and 2 don't have to be done together, but no
44
   target can override the new hook until step 2 is complete for it.
45
 
46
   Once the macros are poisoned, we will revert to the old migration
47
   rules - migrate the macro, callers, and targets all at once.  This
48
   comment can thus be removed at that point.  */
49
 
50
#include "config.h"
51
#include "system.h"
52
#include "coretypes.h"
53
#include "tm.h"
54
#include "machmode.h"
55
#include "rtl.h"
56
#include "tree.h"
57
#include "expr.h"
58
#include "output.h"
59
#include "toplev.h"
60
#include "function.h"
61
#include "target.h"
62
#include "tm_p.h"
63
#include "target-def.h"
64
#include "ggc.h"
65
#include "hard-reg-set.h"
66
#include "reload.h"
67
#include "optabs.h"
68
#include "recog.h"
69
 
70
 
71
bool
72
default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED,
73
                              rtx addr ATTRIBUTE_UNUSED,
74
                              bool strict ATTRIBUTE_UNUSED)
75
{
76
#ifdef GO_IF_LEGITIMATE_ADDRESS
77
  /* Defer to the old implementation using a goto.  */
78
  if (strict)
79
    return strict_memory_address_p (mode, addr);
80
  else
81
    return memory_address_p (mode, addr);
82
#else
83
  gcc_unreachable ();
84
#endif
85
}
86
 
87
void
88
default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
89
{
90
#ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
91
  ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file, fun);
92
#endif
93
}
94
 
95
int
96
default_unspec_may_trap_p (const_rtx x, unsigned flags)
97
{
98
  int i;
99
 
100
  if (GET_CODE (x) == UNSPEC_VOLATILE
101
      /* Any floating arithmetic may trap.  */
102
      || (SCALAR_FLOAT_MODE_P (GET_MODE (x))
103
          && flag_trapping_math))
104
    return 1;
105
 
106
  for (i = 0; i < XVECLEN (x, 0); ++i)
107
    {
108
      if (may_trap_p_1 (XVECEXP (x, 0, i), flags))
109
        return 1;
110
    }
111
 
112
  return 0;
113
}
114
 
115
enum machine_mode
116
default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED,
117
                               enum machine_mode mode,
118
                               int *punsignedp ATTRIBUTE_UNUSED,
119
                               const_tree funtype ATTRIBUTE_UNUSED,
120
                               int for_return ATTRIBUTE_UNUSED)
121
{
122
  if (for_return == 2)
123
    return promote_mode (type, mode, punsignedp);
124
  return mode;
125
}
126
 
127
enum machine_mode
128
default_promote_function_mode_always_promote (const_tree type,
129
                                              enum machine_mode mode,
130
                                              int *punsignedp,
131
                                              const_tree funtype ATTRIBUTE_UNUSED,
132
                                              int for_return ATTRIBUTE_UNUSED)
133
{
134
  return promote_mode (type, mode, punsignedp);
135
}
136
 
137
 
138
enum machine_mode
139
default_cc_modes_compatible (enum machine_mode m1, enum machine_mode m2)
140
{
141
  if (m1 == m2)
142
    return m1;
143
  return VOIDmode;
144
}
145
 
146
bool
147
default_return_in_memory (const_tree type,
148
                          const_tree fntype ATTRIBUTE_UNUSED)
149
{
150
  return (TYPE_MODE (type) == BLKmode);
151
}
152
 
153
rtx
154
default_legitimize_address (rtx x, rtx orig_x ATTRIBUTE_UNUSED,
155
                            enum machine_mode mode ATTRIBUTE_UNUSED)
156
{
157
  return x;
158
}
159
 
160
rtx
161
default_expand_builtin_saveregs (void)
162
{
163
  error ("__builtin_saveregs not supported by this target");
164
  return const0_rtx;
165
}
166
 
167
void
168
default_setup_incoming_varargs (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
169
                                enum machine_mode mode ATTRIBUTE_UNUSED,
170
                                tree type ATTRIBUTE_UNUSED,
171
                                int *pretend_arg_size ATTRIBUTE_UNUSED,
172
                                int second_time ATTRIBUTE_UNUSED)
173
{
174
}
175
 
176
/* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE.  */
177
 
178
rtx
179
default_builtin_setjmp_frame_value (void)
180
{
181
  return virtual_stack_vars_rtx;
182
}
183
 
184
/* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false.  */
185
 
186
bool
187
hook_bool_CUMULATIVE_ARGS_false (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED)
188
{
189
  return false;
190
}
191
 
192
bool
193
default_pretend_outgoing_varargs_named (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED)
194
{
195
  return (targetm.calls.setup_incoming_varargs
196
          != default_setup_incoming_varargs);
197
}
198
 
199
enum machine_mode
200
default_eh_return_filter_mode (void)
201
{
202
  return targetm.unwind_word_mode ();
203
}
204
 
205
enum machine_mode
206
default_libgcc_cmp_return_mode (void)
207
{
208
  return word_mode;
209
}
210
 
211
enum machine_mode
212
default_libgcc_shift_count_mode (void)
213
{
214
  return word_mode;
215
}
216
 
217
enum machine_mode
218
default_unwind_word_mode (void)
219
{
220
  return word_mode;
221
}
222
 
223
/* The default implementation of TARGET_SHIFT_TRUNCATION_MASK.  */
224
 
225
unsigned HOST_WIDE_INT
226
default_shift_truncation_mask (enum machine_mode mode)
227
{
228
  return SHIFT_COUNT_TRUNCATED ? GET_MODE_BITSIZE (mode) - 1 : 0;
229
}
230
 
231
/* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL.  */
232
 
233
unsigned int
234
default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED)
235
{
236
  return have_insn_for (DIV, mode) ? 3 : 2;
237
}
238
 
239
/* The default implementation of TARGET_MODE_REP_EXTENDED.  */
240
 
241
int
242
default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED,
243
                           enum machine_mode mode_rep ATTRIBUTE_UNUSED)
244
{
245
  return UNKNOWN;
246
}
247
 
248
/* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true.  */
249
 
250
bool
251
hook_bool_CUMULATIVE_ARGS_true (CUMULATIVE_ARGS * a ATTRIBUTE_UNUSED)
252
{
253
  return true;
254
}
255
 
256
/* Return machine mode for non-standard suffix
257
   or VOIDmode if non-standard suffixes are unsupported.  */
258
enum machine_mode
259
default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED)
260
{
261
  return VOIDmode;
262
}
263
 
264
/* The generic C++ ABI specifies this is a 64-bit value.  */
265
tree
266
default_cxx_guard_type (void)
267
{
268
  return long_long_integer_type_node;
269
}
270
 
271
 
272
/* Returns the size of the cookie to use when allocating an array
273
   whose elements have the indicated TYPE.  Assumes that it is already
274
   known that a cookie is needed.  */
275
 
276
tree
277
default_cxx_get_cookie_size (tree type)
278
{
279
  tree cookie_size;
280
 
281
  /* We need to allocate an additional max (sizeof (size_t), alignof
282
     (true_type)) bytes.  */
283
  tree sizetype_size;
284
  tree type_align;
285
 
286
  sizetype_size = size_in_bytes (sizetype);
287
  type_align = size_int (TYPE_ALIGN_UNIT (type));
288
  if (INT_CST_LT_UNSIGNED (type_align, sizetype_size))
289
    cookie_size = sizetype_size;
290
  else
291
    cookie_size = type_align;
292
 
293
  return cookie_size;
294
}
295
 
296
/* Return true if a parameter must be passed by reference.  This version
297
   of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK.  */
298
 
299
bool
300
hook_pass_by_reference_must_pass_in_stack (CUMULATIVE_ARGS *c ATTRIBUTE_UNUSED,
301
        enum machine_mode mode ATTRIBUTE_UNUSED, const_tree type ATTRIBUTE_UNUSED,
302
        bool named_arg ATTRIBUTE_UNUSED)
303
{
304
  return targetm.calls.must_pass_in_stack (mode, type);
305
}
306
 
307
/* Return true if a parameter follows callee copies conventions.  This
308
   version of the hook is true for all named arguments.  */
309
 
310
bool
311
hook_callee_copies_named (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
312
                          enum machine_mode mode ATTRIBUTE_UNUSED,
313
                          const_tree type ATTRIBUTE_UNUSED, bool named)
314
{
315
  return named;
316
}
317
 
318
/* Emit any directives required to unwind this instruction.  */
319
 
320
void
321
default_unwind_emit (FILE * stream ATTRIBUTE_UNUSED,
322
                     rtx insn ATTRIBUTE_UNUSED)
323
{
324
  /* Should never happen.  */
325
  gcc_unreachable ();
326
}
327
 
328
/* True if MODE is valid for the target.  By "valid", we mean able to
329
   be manipulated in non-trivial ways.  In particular, this means all
330
   the arithmetic is supported.
331
 
332
   By default we guess this means that any C type is supported.  If
333
   we can't map the mode back to a type that would be available in C,
334
   then reject it.  Special case, here, is the double-word arithmetic
335
   supported by optabs.c.  */
336
 
337
bool
338
default_scalar_mode_supported_p (enum machine_mode mode)
339
{
340
  int precision = GET_MODE_PRECISION (mode);
341
 
342
  switch (GET_MODE_CLASS (mode))
343
    {
344
    case MODE_PARTIAL_INT:
345
    case MODE_INT:
346
      if (precision == CHAR_TYPE_SIZE)
347
        return true;
348
      if (precision == SHORT_TYPE_SIZE)
349
        return true;
350
      if (precision == INT_TYPE_SIZE)
351
        return true;
352
      if (precision == LONG_TYPE_SIZE)
353
        return true;
354
      if (precision == LONG_LONG_TYPE_SIZE)
355
        return true;
356
      if (precision == 2 * BITS_PER_WORD)
357
        return true;
358
      return false;
359
 
360
    case MODE_FLOAT:
361
      if (precision == FLOAT_TYPE_SIZE)
362
        return true;
363
      if (precision == DOUBLE_TYPE_SIZE)
364
        return true;
365
      if (precision == LONG_DOUBLE_TYPE_SIZE)
366
        return true;
367
      return false;
368
 
369
    case MODE_DECIMAL_FLOAT:
370
    case MODE_FRACT:
371
    case MODE_UFRACT:
372
    case MODE_ACCUM:
373
    case MODE_UACCUM:
374
      return false;
375
 
376
    default:
377
      gcc_unreachable ();
378
    }
379
}
380
 
381
/* True if the target supports decimal floating point.  */
382
 
383
bool
384
default_decimal_float_supported_p (void)
385
{
386
  return ENABLE_DECIMAL_FLOAT;
387
}
388
 
389
/* True if the target supports fixed-point arithmetic.  */
390
 
391
bool
392
default_fixed_point_supported_p (void)
393
{
394
  return ENABLE_FIXED_POINT;
395
}
396
 
397
/* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
398
   an error message.
399
 
400
   This function checks whether a given INSN is valid within a low-overhead
401
   loop.  If INSN is invalid it returns the reason for that, otherwise it
402
   returns NULL. A called function may clobber any special registers required
403
   for low-overhead looping. Additionally, some targets (eg, PPC) use the count
404
   register for branch on table instructions. We reject the doloop pattern in
405
   these cases.  */
406
 
407
const char *
408
default_invalid_within_doloop (const_rtx insn)
409
{
410
  if (CALL_P (insn))
411
    return "Function call in loop.";
412
 
413
  if (JUMP_TABLE_DATA_P (insn))
414
    return "Computed branch in the loop.";
415
 
416
  return NULL;
417
}
418
 
419
/* Mapping of builtin functions to vectorized variants.  */
420
 
421
tree
422
default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED,
423
                                     tree type_out ATTRIBUTE_UNUSED,
424
                                     tree type_in ATTRIBUTE_UNUSED)
425
{
426
  return NULL_TREE;
427
}
428
 
429
/* Vectorized conversion.  */
430
 
431
tree
432
default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED,
433
                                       tree type ATTRIBUTE_UNUSED)
434
{
435
  return NULL_TREE;
436
}
437
 
438
/* Reciprocal.  */
439
 
440
tree
441
default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED,
442
                            bool md_fn ATTRIBUTE_UNUSED,
443
                            bool sqrt ATTRIBUTE_UNUSED)
444
{
445
  return NULL_TREE;
446
}
447
 
448
bool
449
hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
450
        CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
451
        enum machine_mode mode ATTRIBUTE_UNUSED,
452
        const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
453
{
454
  return false;
455
}
456
 
457
bool
458
hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
459
        CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
460
        enum machine_mode mode ATTRIBUTE_UNUSED,
461
        const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
462
{
463
  return true;
464
}
465
 
466
int
467
hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
468
        CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
469
        enum machine_mode mode ATTRIBUTE_UNUSED,
470
        tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
471
{
472
  return 0;
473
}
474
 
475
void
476
hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
477
{
478
}
479
 
480
const char *
481
hook_invalid_arg_for_unprototyped_fn (
482
        const_tree typelist ATTRIBUTE_UNUSED,
483
        const_tree funcdecl ATTRIBUTE_UNUSED,
484
        const_tree val ATTRIBUTE_UNUSED)
485
{
486
  return NULL;
487
}
488
 
489
/* Initialize the stack protection decls.  */
490
 
491
/* Stack protection related decls living in libgcc.  */
492
static GTY(()) tree stack_chk_guard_decl;
493
 
494
tree
495
default_stack_protect_guard (void)
496
{
497
  tree t = stack_chk_guard_decl;
498
 
499
  if (t == NULL)
500
    {
501
      t = build_decl (UNKNOWN_LOCATION,
502
                      VAR_DECL, get_identifier ("__stack_chk_guard"),
503
                      ptr_type_node);
504
      TREE_STATIC (t) = 1;
505
      TREE_PUBLIC (t) = 1;
506
      DECL_EXTERNAL (t) = 1;
507
      TREE_USED (t) = 1;
508
      TREE_THIS_VOLATILE (t) = 1;
509
      DECL_ARTIFICIAL (t) = 1;
510
      DECL_IGNORED_P (t) = 1;
511
 
512
      stack_chk_guard_decl = t;
513
    }
514
 
515
  return t;
516
}
517
 
518
static GTY(()) tree stack_chk_fail_decl;
519
 
520
tree
521
default_external_stack_protect_fail (void)
522
{
523
  tree t = stack_chk_fail_decl;
524
 
525
  if (t == NULL_TREE)
526
    {
527
      t = build_function_type_list (void_type_node, NULL_TREE);
528
      t = build_decl (UNKNOWN_LOCATION,
529
                      FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
530
      TREE_STATIC (t) = 1;
531
      TREE_PUBLIC (t) = 1;
532
      DECL_EXTERNAL (t) = 1;
533
      TREE_USED (t) = 1;
534
      TREE_THIS_VOLATILE (t) = 1;
535
      TREE_NOTHROW (t) = 1;
536
      DECL_ARTIFICIAL (t) = 1;
537
      DECL_IGNORED_P (t) = 1;
538
      DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
539
      DECL_VISIBILITY_SPECIFIED (t) = 1;
540
 
541
      stack_chk_fail_decl = t;
542
    }
543
 
544
  return build_call_expr (t, 0);
545
}
546
 
547
tree
548
default_hidden_stack_protect_fail (void)
549
{
550
#ifndef HAVE_GAS_HIDDEN
551
  return default_external_stack_protect_fail ();
552
#else
553
  tree t = stack_chk_fail_decl;
554
 
555
  if (!flag_pic)
556
    return default_external_stack_protect_fail ();
557
 
558
  if (t == NULL_TREE)
559
    {
560
      t = build_function_type_list (void_type_node, NULL_TREE);
561
      t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
562
                      get_identifier ("__stack_chk_fail_local"), t);
563
      TREE_STATIC (t) = 1;
564
      TREE_PUBLIC (t) = 1;
565
      DECL_EXTERNAL (t) = 1;
566
      TREE_USED (t) = 1;
567
      TREE_THIS_VOLATILE (t) = 1;
568
      TREE_NOTHROW (t) = 1;
569
      DECL_ARTIFICIAL (t) = 1;
570
      DECL_IGNORED_P (t) = 1;
571
      DECL_VISIBILITY_SPECIFIED (t) = 1;
572
      DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
573
 
574
      stack_chk_fail_decl = t;
575
    }
576
 
577
  return build_call_expr (t, 0);
578
#endif
579
}
580
 
581
bool
582
hook_bool_const_rtx_commutative_p (const_rtx x,
583
                                   int outer_code ATTRIBUTE_UNUSED)
584
{
585
  return COMMUTATIVE_P (x);
586
}
587
 
588
rtx
589
default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
590
                        const_tree fn_decl_or_type,
591
                        bool outgoing ATTRIBUTE_UNUSED)
592
{
593
  /* The old interface doesn't handle receiving the function type.  */
594
  if (fn_decl_or_type
595
      && !DECL_P (fn_decl_or_type))
596
    fn_decl_or_type = NULL;
597
 
598
#ifdef FUNCTION_OUTGOING_VALUE
599
  if (outgoing)
600
    return FUNCTION_OUTGOING_VALUE (ret_type, fn_decl_or_type);
601
#endif
602
 
603
#ifdef FUNCTION_VALUE
604
  return FUNCTION_VALUE (ret_type, fn_decl_or_type);
605
#else
606
  gcc_unreachable ();
607
#endif
608
}
609
 
610
rtx
611
default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED,
612
                       const_rtx fun ATTRIBUTE_UNUSED)
613
{
614
#ifdef LIBCALL_VALUE
615
  return LIBCALL_VALUE (mode);
616
#else
617
  gcc_unreachable ();
618
#endif
619
}
620
 
621
rtx
622
default_internal_arg_pointer (void)
623
{
624
  /* If the reg that the virtual arg pointer will be translated into is
625
     not a fixed reg or is the stack pointer, make a copy of the virtual
626
     arg pointer, and address parms via the copy.  The frame pointer is
627
     considered fixed even though it is not marked as such.  */
628
  if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
629
       || ! (fixed_regs[ARG_POINTER_REGNUM]
630
             || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
631
    return copy_to_reg (virtual_incoming_args_rtx);
632
  else
633
    return virtual_incoming_args_rtx;
634
}
635
 
636
rtx
637
default_static_chain (const_tree fndecl, bool incoming_p)
638
{
639
  if (!DECL_STATIC_CHAIN (fndecl))
640
    return NULL;
641
 
642
  if (incoming_p)
643
    {
644
#ifdef STATIC_CHAIN_INCOMING_REGNUM
645
      return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
646
#endif
647
    }
648
 
649
#ifdef STATIC_CHAIN_REGNUM
650
  return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
651
#endif
652
 
653
  {
654
    static bool issued_error;
655
    if (!issued_error)
656
      {
657
        issued_error = true;
658
        sorry ("nested functions not supported on this target");
659
      }
660
 
661
    /* It really doesn't matter what we return here, so long at it
662
       doesn't cause the rest of the compiler to crash.  */
663
    return gen_rtx_MEM (Pmode, stack_pointer_rtx);
664
  }
665
}
666
 
667
void
668
default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
669
                         rtx ARG_UNUSED (r_chain))
670
{
671
  sorry ("nested function trampolines not supported on this target");
672
}
673
 
674
enum reg_class
675
default_branch_target_register_class (void)
676
{
677
  return NO_REGS;
678
}
679
 
680
#ifdef IRA_COVER_CLASSES
681
const enum reg_class *
682
default_ira_cover_classes (void)
683
{
684
  static enum reg_class classes[] = IRA_COVER_CLASSES;
685
  return classes;
686
}
687
#endif
688
 
689
enum reg_class
690
default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
691
                          enum reg_class reload_class ATTRIBUTE_UNUSED,
692
                          enum machine_mode reload_mode ATTRIBUTE_UNUSED,
693
                          secondary_reload_info *sri)
694
{
695
  enum reg_class rclass = NO_REGS;
696
 
697
  if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
698
    {
699
      sri->icode = sri->prev_sri->t_icode;
700
      return NO_REGS;
701
    }
702
#ifdef SECONDARY_INPUT_RELOAD_CLASS
703
  if (in_p)
704
    rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x);
705
#endif
706
#ifdef SECONDARY_OUTPUT_RELOAD_CLASS
707
  if (! in_p)
708
    rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x);
709
#endif
710
  if (rclass != NO_REGS)
711
    {
712
      enum insn_code icode = (in_p ? reload_in_optab[(int) reload_mode]
713
                              : reload_out_optab[(int) reload_mode]);
714
 
715
      if (icode != CODE_FOR_nothing
716
          && insn_data[(int) icode].operand[in_p].predicate
717
          && ! insn_data[(int) icode].operand[in_p].predicate (x, reload_mode))
718
        icode = CODE_FOR_nothing;
719
      else if (icode != CODE_FOR_nothing)
720
        {
721
          const char *insn_constraint, *scratch_constraint;
722
          char insn_letter, scratch_letter;
723
          enum reg_class insn_class, scratch_class;
724
 
725
          gcc_assert (insn_data[(int) icode].n_operands == 3);
726
          insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
727
          if (!*insn_constraint)
728
            insn_class = ALL_REGS;
729
          else
730
            {
731
              if (in_p)
732
                {
733
                  gcc_assert (*insn_constraint == '=');
734
                  insn_constraint++;
735
                }
736
              insn_letter = *insn_constraint;
737
              insn_class
738
                = (insn_letter == 'r' ? GENERAL_REGS
739
                   : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter,
740
                                                insn_constraint));
741
              gcc_assert (insn_class != NO_REGS);
742
            }
743
 
744
          scratch_constraint = insn_data[(int) icode].operand[2].constraint;
745
          /* The scratch register's constraint must start with "=&",
746
             except for an input reload, where only "=" is necessary,
747
             and where it might be beneficial to re-use registers from
748
             the input.  */
749
          gcc_assert (scratch_constraint[0] == '='
750
                      && (in_p || scratch_constraint[1] == '&'));
751
          scratch_constraint++;
752
          if (*scratch_constraint == '&')
753
            scratch_constraint++;
754
          scratch_letter = *scratch_constraint;
755
          scratch_class
756
            = (scratch_letter == 'r' ? GENERAL_REGS
757
               : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter,
758
                                            scratch_constraint));
759
 
760
          if (reg_class_subset_p (reload_class, insn_class))
761
            {
762
              gcc_assert (scratch_class == rclass);
763
              rclass = NO_REGS;
764
            }
765
          else
766
            rclass = insn_class;
767
 
768
        }
769
      if (rclass == NO_REGS)
770
        sri->icode = icode;
771
      else
772
        sri->t_icode = icode;
773
    }
774
  return rclass;
775
}
776
 
777
bool
778
default_handle_c_option (size_t code ATTRIBUTE_UNUSED,
779
                         const char *arg ATTRIBUTE_UNUSED,
780
                         int value ATTRIBUTE_UNUSED)
781
{
782
  return false;
783
}
784
 
785
/* By default, if flag_pic is true, then neither local nor global relocs
786
   should be placed in readonly memory.  */
787
 
788
int
789
default_reloc_rw_mask (void)
790
{
791
  return flag_pic ? 3 : 0;
792
}
793
 
794
/* By default, do no modification. */
795
tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
796
                                         tree id)
797
{
798
   return id;
799
}
800
 
801
bool
802
default_builtin_vector_alignment_reachable (const_tree type, bool is_packed)
803
{
804
  if (is_packed)
805
    return false;
806
 
807
  /* Assuming that types whose size is > pointer-size are not guaranteed to be
808
     naturally aligned.  */
809
  if (tree_int_cst_compare (TYPE_SIZE (type), bitsize_int (POINTER_SIZE)) > 0)
810
    return false;
811
 
812
  /* Assuming that types whose size is <= pointer-size
813
     are naturally aligned.  */
814
  return true;
815
}
816
 
817
/* By default, assume that a target supports any factor of misalignment
818
   memory access if it supports movmisalign patten.
819
   is_packed is true if the memory access is defined in a packed struct.  */
820
bool
821
default_builtin_support_vector_misalignment (enum machine_mode mode,
822
                                             const_tree type
823
                                             ATTRIBUTE_UNUSED,
824
                                             int misalignment
825
                                             ATTRIBUTE_UNUSED,
826
                                             bool is_packed
827
                                             ATTRIBUTE_UNUSED)
828
{
829
  if (optab_handler (movmisalign_optab, mode)->insn_code != CODE_FOR_nothing)
830
    return true;
831
  return false;
832
}
833
 
834
/* Determine whether or not a pointer mode is valid. Assume defaults
835
   of ptr_mode or Pmode - can be overridden.  */
836
bool
837
default_valid_pointer_mode (enum machine_mode mode)
838
{
839
  return (mode == ptr_mode || mode == Pmode);
840
}
841
 
842
/* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
843
   for the generic address space only.  */
844
 
845
enum machine_mode
846
default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
847
{
848
  gcc_assert (ADDR_SPACE_GENERIC_P (addrspace));
849
  return ptr_mode;
850
}
851
 
852
/* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
853
   for the generic address space only.  */
854
 
855
enum machine_mode
856
default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
857
{
858
  gcc_assert (ADDR_SPACE_GENERIC_P (addrspace));
859
  return Pmode;
860
}
861
 
862
/* Named address space version of valid_pointer_mode.  */
863
 
864
bool
865
default_addr_space_valid_pointer_mode (enum machine_mode mode, addr_space_t as)
866
{
867
  if (!ADDR_SPACE_GENERIC_P (as))
868
    return (mode == targetm.addr_space.pointer_mode (as)
869
            || mode == targetm.addr_space.address_mode (as));
870
 
871
  return targetm.valid_pointer_mode (mode);
872
}
873
 
874
/* Some places still assume that all pointer or address modes are the
875
   standard Pmode and ptr_mode.  These optimizations become invalid if
876
   the target actually supports multiple different modes.  For now,
877
   we disable such optimizations on such targets, using this function.  */
878
 
879
bool
880
target_default_pointer_address_modes_p (void)
881
{
882
  if (targetm.addr_space.address_mode != default_addr_space_address_mode)
883
    return false;
884
  if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
885
    return false;
886
 
887
  return true;
888
}
889
 
890
/* Named address space version of legitimate_address_p.  */
891
 
892
bool
893
default_addr_space_legitimate_address_p (enum machine_mode mode, rtx mem,
894
                                         bool strict, addr_space_t as)
895
{
896
  if (!ADDR_SPACE_GENERIC_P (as))
897
    gcc_unreachable ();
898
 
899
  return targetm.legitimate_address_p (mode, mem, strict);
900
}
901
 
902
/* Named address space version of LEGITIMIZE_ADDRESS.  */
903
 
904
rtx
905
default_addr_space_legitimize_address (rtx x, rtx oldx,
906
                                       enum machine_mode mode, addr_space_t as)
907
{
908
  if (!ADDR_SPACE_GENERIC_P (as))
909
    return x;
910
 
911
  return targetm.legitimize_address (x, oldx, mode);
912
}
913
 
914
/* The default hook for determining if one named address space is a subset of
915
   another and to return which address space to use as the common address
916
   space.  */
917
 
918
bool
919
default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
920
{
921
  return (subset == superset);
922
}
923
 
924
/* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
925
   called for targets with only a generic address space.  */
926
 
927
rtx
928
default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
929
                            tree from_type ATTRIBUTE_UNUSED,
930
                            tree to_type ATTRIBUTE_UNUSED)
931
{
932
  gcc_unreachable ();
933
}
934
 
935
bool
936
default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
937
{
938
  return true;
939
}
940
 
941
bool
942
default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
943
                                         tree ARG_UNUSED (name),
944
                                         tree ARG_UNUSED (args),
945
                                         int ARG_UNUSED (flags))
946
{
947
  warning (OPT_Wattributes,
948
           "target attribute is not supported on this machine");
949
 
950
  return false;
951
}
952
 
953
bool
954
default_target_option_pragma_parse (tree ARG_UNUSED (args),
955
                                    tree ARG_UNUSED (pop_target))
956
{
957
  warning (OPT_Wpragmas,
958
           "#pragma GCC target is not supported for this machine");
959
 
960
  return false;
961
}
962
 
963
bool
964
default_target_can_inline_p (tree caller, tree callee)
965
{
966
  bool ret = false;
967
  tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
968
  tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
969
 
970
  /* If callee has no option attributes, then it is ok to inline */
971
  if (!callee_opts)
972
    ret = true;
973
 
974
  /* If caller has no option attributes, but callee does then it is not ok to
975
     inline */
976
  else if (!caller_opts)
977
    ret = false;
978
 
979
  /* If both caller and callee have attributes, assume that if the pointer is
980
     different, the the two functions have different target options since
981
     build_target_option_node uses a hash table for the options.  */
982
  else
983
    ret = (callee_opts == caller_opts);
984
 
985
  return ret;
986
}
987
 
988
#ifndef HAVE_casesi
989
# define HAVE_casesi 0
990
#endif
991
 
992
/* If the machine does not have a case insn that compares the bounds,
993
   this means extra overhead for dispatch tables, which raises the
994
   threshold for using them.  */
995
 
996
unsigned int default_case_values_threshold (void)
997
{
998
  return (HAVE_casesi ? 4 : 5);
999
}
1000
 
1001
bool
1002
default_have_conditional_execution (void)
1003
{
1004
#ifdef HAVE_conditional_execution
1005
  return HAVE_conditional_execution;
1006
#else
1007
  return false;
1008
#endif
1009
}
1010
 
1011
#include "gt-targhooks.h"

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