1/* Default target hook functions.
2 Copyright (C) 2003-2017 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3. If not see
18<http://www.gnu.org/licenses/>. */
19
20/* The migration of target macros to target hooks works as follows:
21
22 1. Create a target hook that uses the existing target macros to
23 implement the same functionality.
24
25 2. Convert all the MI files to use the hook instead of the macro.
26
27 3. Repeat for a majority of the remaining target macros. This will
28 take some time.
29
30 4. Tell target maintainers to start migrating.
31
32 5. Eventually convert the backends to override the hook instead of
33 defining the macros. This will take some time too.
34
35 6. TBD when, poison the macros. Unmigrated targets will break at
36 this point.
37
38 Note that we expect steps 1-3 to be done by the people that
39 understand what the MI does with each macro, and step 5 to be done
40 by the target maintainers for their respective targets.
41
42 Note that steps 1 and 2 don't have to be done together, but no
43 target can override the new hook until step 2 is complete for it.
44
45 Once the macros are poisoned, we will revert to the old migration
46 rules - migrate the macro, callers, and targets all at once. This
47 comment can thus be removed at that point. */
48
49#include "config.h"
50#include "system.h"
51#include "coretypes.h"
52#include "target.h"
53#include "function.h"
54#include "rtl.h"
55#include "tree.h"
56#include "tree-ssa-alias.h"
57#include "gimple-expr.h"
58#include "memmodel.h"
59#include "tm_p.h"
60#include "stringpool.h"
61#include "tree-vrp.h"
62#include "tree-ssanames.h"
63#include "profile-count.h"
64#include "optabs.h"
65#include "regs.h"
66#include "recog.h"
67#include "diagnostic-core.h"
68#include "fold-const.h"
69#include "stor-layout.h"
70#include "varasm.h"
71#include "flags.h"
72#include "explow.h"
73#include "calls.h"
74#include "expr.h"
75#include "output.h"
76#include "common/common-target.h"
77#include "reload.h"
78#include "intl.h"
79#include "opts.h"
80#include "gimplify.h"
81#include "predict.h"
82#include "params.h"
83#include "real.h"
84#include "langhooks.h"
85
86bool
87default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED,
88 rtx addr ATTRIBUTE_UNUSED,
89 bool strict ATTRIBUTE_UNUSED)
90{
91#ifdef GO_IF_LEGITIMATE_ADDRESS
92 /* Defer to the old implementation using a goto. */
93 if (strict)
94 return strict_memory_address_p (mode, addr);
95 else
96 return memory_address_p (mode, addr);
97#else
98 gcc_unreachable ();
99#endif
100}
101
102void
103default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
104{
105#ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
106 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file, fun);
107#endif
108}
109
110int
111default_unspec_may_trap_p (const_rtx x, unsigned flags)
112{
113 int i;
114
115 /* Any floating arithmetic may trap. */
116 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x)) && flag_trapping_math))
117 return 1;
118
119 for (i = 0; i < XVECLEN (x, 0); ++i)
120 {
121 if (may_trap_p_1 (XVECEXP (x, 0, i), flags))
122 return 1;
123 }
124
125 return 0;
126}
127
128machine_mode
129default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED,
130 machine_mode mode,
131 int *punsignedp ATTRIBUTE_UNUSED,
132 const_tree funtype ATTRIBUTE_UNUSED,
133 int for_return ATTRIBUTE_UNUSED)
134{
135 if (type != NULL_TREE && for_return == 2)
136 return promote_mode (type, mode, punsignedp);
137 return mode;
138}
139
140machine_mode
141default_promote_function_mode_always_promote (const_tree type,
142 machine_mode mode,
143 int *punsignedp,
144 const_tree funtype ATTRIBUTE_UNUSED,
145 int for_return ATTRIBUTE_UNUSED)
146{
147 return promote_mode (type, mode, punsignedp);
148}
149
150machine_mode
151default_cc_modes_compatible (machine_mode m1, machine_mode m2)
152{
153 if (m1 == m2)
154 return m1;
155 return VOIDmode;
156}
157
158bool
159default_return_in_memory (const_tree type,
160 const_tree fntype ATTRIBUTE_UNUSED)
161{
162 return (TYPE_MODE (type) == BLKmode);
163}
164
165rtx
166default_legitimize_address (rtx x, rtx orig_x ATTRIBUTE_UNUSED,
167 machine_mode mode ATTRIBUTE_UNUSED)
168{
169 return x;
170}
171
172bool
173default_legitimize_address_displacement (rtx *disp ATTRIBUTE_UNUSED,
174 rtx *offset ATTRIBUTE_UNUSED,
175 machine_mode mode ATTRIBUTE_UNUSED)
176{
177 return false;
178}
179
180bool
181default_const_not_ok_for_debug_p (rtx x)
182{
183 if (GET_CODE (x) == UNSPEC)
184 return true;
185 return false;
186}
187
188rtx
189default_expand_builtin_saveregs (void)
190{
191 error ("__builtin_saveregs not supported by this target");
192 return const0_rtx;
193}
194
195void
196default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED,
197 machine_mode mode ATTRIBUTE_UNUSED,
198 tree type ATTRIBUTE_UNUSED,
199 int *pretend_arg_size ATTRIBUTE_UNUSED,
200 int second_time ATTRIBUTE_UNUSED)
201{
202}
203
204/* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
205
206rtx
207default_builtin_setjmp_frame_value (void)
208{
209 return virtual_stack_vars_rtx;
210}
211
212/* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
213
214bool
215hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED)
216{
217 return false;
218}
219
220bool
221default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED)
222{
223 return (targetm.calls.setup_incoming_varargs
224 != default_setup_incoming_varargs);
225}
226
227scalar_int_mode
228default_eh_return_filter_mode (void)
229{
230 return targetm.unwind_word_mode ();
231}
232
233scalar_int_mode
234default_libgcc_cmp_return_mode (void)
235{
236 return word_mode;
237}
238
239scalar_int_mode
240default_libgcc_shift_count_mode (void)
241{
242 return word_mode;
243}
244
245scalar_int_mode
246default_unwind_word_mode (void)
247{
248 return word_mode;
249}
250
251/* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
252
253unsigned HOST_WIDE_INT
254default_shift_truncation_mask (machine_mode mode)
255{
256 return SHIFT_COUNT_TRUNCATED ? GET_MODE_UNIT_BITSIZE (mode) - 1 : 0;
257}
258
259/* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
260
261unsigned int
262default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED)
263{
264 return have_insn_for (DIV, mode) ? 3 : 2;
265}
266
267/* The default implementation of TARGET_MODE_REP_EXTENDED. */
268
269int
270default_mode_rep_extended (scalar_int_mode, scalar_int_mode)
271{
272 return UNKNOWN;
273}
274
275/* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
276
277bool
278hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED)
279{
280 return true;
281}
282
283/* Return machine mode for non-standard suffix
284 or VOIDmode if non-standard suffixes are unsupported. */
285machine_mode
286default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED)
287{
288 return VOIDmode;
289}
290
291/* The generic C++ ABI specifies this is a 64-bit value. */
292tree
293default_cxx_guard_type (void)
294{
295 return long_long_integer_type_node;
296}
297
298/* Returns the size of the cookie to use when allocating an array
299 whose elements have the indicated TYPE. Assumes that it is already
300 known that a cookie is needed. */
301
302tree
303default_cxx_get_cookie_size (tree type)
304{
305 tree cookie_size;
306
307 /* We need to allocate an additional max (sizeof (size_t), alignof
308 (true_type)) bytes. */
309 tree sizetype_size;
310 tree type_align;
311
312 sizetype_size = size_in_bytes (sizetype);
313 type_align = size_int (TYPE_ALIGN_UNIT (type));
314 if (tree_int_cst_lt (type_align, sizetype_size))
315 cookie_size = sizetype_size;
316 else
317 cookie_size = type_align;
318
319 return cookie_size;
320}
321
322/* Return true if a parameter must be passed by reference. This version
323 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
324
325bool
326hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED,
327 machine_mode mode ATTRIBUTE_UNUSED, const_tree type ATTRIBUTE_UNUSED,
328 bool named_arg ATTRIBUTE_UNUSED)
329{
330 return targetm.calls.must_pass_in_stack (mode, type);
331}
332
333/* Return true if a parameter follows callee copies conventions. This
334 version of the hook is true for all named arguments. */
335
336bool
337hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED,
338 machine_mode mode ATTRIBUTE_UNUSED,
339 const_tree type ATTRIBUTE_UNUSED, bool named)
340{
341 return named;
342}
343
344/* Emit to STREAM the assembler syntax for insn operand X. */
345
346void
347default_print_operand (FILE *stream ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
348 int code ATTRIBUTE_UNUSED)
349{
350#ifdef PRINT_OPERAND
351 PRINT_OPERAND (stream, x, code);
352#else
353 gcc_unreachable ();
354#endif
355}
356
357/* Emit to STREAM the assembler syntax for an insn operand whose memory
358 address is X. */
359
360void
361default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED,
362 machine_mode /*mode*/,
363 rtx x ATTRIBUTE_UNUSED)
364{
365#ifdef PRINT_OPERAND_ADDRESS
366 PRINT_OPERAND_ADDRESS (stream, x);
367#else
368 gcc_unreachable ();
369#endif
370}
371
372/* Return true if CODE is a valid punctuation character for the
373 `print_operand' hook. */
374
375bool
376default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED)
377{
378#ifdef PRINT_OPERAND_PUNCT_VALID_P
379 return PRINT_OPERAND_PUNCT_VALID_P (code);
380#else
381 return false;
382#endif
383}
384
385/* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
386tree
387default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED)
388{
389 const char *skipped = name + (*name == '*' ? 1 : 0);
390 const char *stripped = targetm.strip_name_encoding (skipped);
391 if (*name != '*' && user_label_prefix[0])
392 stripped = ACONCAT ((user_label_prefix, stripped, NULL));
393 return get_identifier (stripped);
394}
395
396/* True if MODE is valid for the target. By "valid", we mean able to
397 be manipulated in non-trivial ways. In particular, this means all
398 the arithmetic is supported.
399
400 By default we guess this means that any C type is supported. If
401 we can't map the mode back to a type that would be available in C,
402 then reject it. Special case, here, is the double-word arithmetic
403 supported by optabs.c. */
404
405bool
406default_scalar_mode_supported_p (scalar_mode mode)
407{
408 int precision = GET_MODE_PRECISION (mode);
409
410 switch (GET_MODE_CLASS (mode))
411 {
412 case MODE_PARTIAL_INT:
413 case MODE_INT:
414 if (precision == CHAR_TYPE_SIZE)
415 return true;
416 if (precision == SHORT_TYPE_SIZE)
417 return true;
418 if (precision == INT_TYPE_SIZE)
419 return true;
420 if (precision == LONG_TYPE_SIZE)
421 return true;
422 if (precision == LONG_LONG_TYPE_SIZE)
423 return true;
424 if (precision == 2 * BITS_PER_WORD)
425 return true;
426 return false;
427
428 case MODE_FLOAT:
429 if (precision == FLOAT_TYPE_SIZE)
430 return true;
431 if (precision == DOUBLE_TYPE_SIZE)
432 return true;
433 if (precision == LONG_DOUBLE_TYPE_SIZE)
434 return true;
435 return false;
436
437 case MODE_DECIMAL_FLOAT:
438 case MODE_FRACT:
439 case MODE_UFRACT:
440 case MODE_ACCUM:
441 case MODE_UACCUM:
442 return false;
443
444 default:
445 gcc_unreachable ();
446 }
447}
448
449/* Return true if libgcc supports floating-point mode MODE (known to
450 be supported as a scalar mode). */
451
452bool
453default_libgcc_floating_mode_supported_p (scalar_float_mode mode)
454{
455 switch (mode)
456 {
457#ifdef HAVE_SFmode
458 case E_SFmode:
459#endif
460#ifdef HAVE_DFmode
461 case E_DFmode:
462#endif
463#ifdef HAVE_XFmode
464 case E_XFmode:
465#endif
466#ifdef HAVE_TFmode
467 case E_TFmode:
468#endif
469 return true;
470
471 default:
472 return false;
473 }
474}
475
476/* Return the machine mode to use for the type _FloatN, if EXTENDED is
477 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
478 supported. */
479opt_scalar_float_mode
480default_floatn_mode (int n, bool extended)
481{
482 if (extended)
483 {
484 opt_scalar_float_mode cand1, cand2;
485 scalar_float_mode mode;
486 switch (n)
487 {
488 case 32:
489#ifdef HAVE_DFmode
490 cand1 = DFmode;
491#endif
492 break;
493
494 case 64:
495#ifdef HAVE_XFmode
496 cand1 = XFmode;
497#endif
498#ifdef HAVE_TFmode
499 cand2 = TFmode;
500#endif
501 break;
502
503 case 128:
504 break;
505
506 default:
507 /* Those are the only valid _FloatNx types. */
508 gcc_unreachable ();
509 }
510 if (cand1.exists (&mode)
511 && REAL_MODE_FORMAT (mode)->ieee_bits > n
512 && targetm.scalar_mode_supported_p (mode)
513 && targetm.libgcc_floating_mode_supported_p (mode))
514 return cand1;
515 if (cand2.exists (&mode)
516 && REAL_MODE_FORMAT (mode)->ieee_bits > n
517 && targetm.scalar_mode_supported_p (mode)
518 && targetm.libgcc_floating_mode_supported_p (mode))
519 return cand2;
520 }
521 else
522 {
523 opt_scalar_float_mode cand;
524 scalar_float_mode mode;
525 switch (n)
526 {
527 case 16:
528 /* Always enable _Float16 if we have basic support for the mode.
529 Targets can control the range and precision of operations on
530 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
531#ifdef HAVE_HFmode
532 cand = HFmode;
533#endif
534 break;
535
536 case 32:
537#ifdef HAVE_SFmode
538 cand = SFmode;
539#endif
540 break;
541
542 case 64:
543#ifdef HAVE_DFmode
544 cand = DFmode;
545#endif
546 break;
547
548 case 128:
549#ifdef HAVE_TFmode
550 cand = TFmode;
551#endif
552 break;
553
554 default:
555 break;
556 }
557 if (cand.exists (&mode)
558 && REAL_MODE_FORMAT (mode)->ieee_bits == n
559 && targetm.scalar_mode_supported_p (mode)
560 && targetm.libgcc_floating_mode_supported_p (mode))
561 return cand;
562 }
563 return opt_scalar_float_mode ();
564}
565
566/* Define this to return true if the _Floatn and _Floatnx built-in functions
567 should implicitly enable the built-in function without the __builtin_ prefix
568 in addition to the normal built-in function with the __builtin_ prefix. The
569 default is to only enable built-in functions without the __builtin_ prefix
570 for the GNU C langauge. The argument FUNC is the enum builtin_in_function
571 id of the function to be enabled. */
572
573bool
574default_floatn_builtin_p (int func ATTRIBUTE_UNUSED)
575{
576 static bool first_time_p = true;
577 static bool c_or_objective_c;
578
579 if (first_time_p)
580 {
581 first_time_p = false;
582 c_or_objective_c = lang_GNU_C () || lang_GNU_OBJC ();
583 }
584
585 return c_or_objective_c;
586}
587
588/* Make some target macros useable by target-independent code. */
589bool
590targhook_words_big_endian (void)
591{
592 return !!WORDS_BIG_ENDIAN;
593}
594
595bool
596targhook_float_words_big_endian (void)
597{
598 return !!FLOAT_WORDS_BIG_ENDIAN;
599}
600
601/* True if the target supports floating-point exceptions and rounding
602 modes. */
603
604bool
605default_float_exceptions_rounding_supported_p (void)
606{
607#ifdef HAVE_adddf3
608 return HAVE_adddf3;
609#else
610 return false;
611#endif
612}
613
614/* True if the target supports decimal floating point. */
615
616bool
617default_decimal_float_supported_p (void)
618{
619 return ENABLE_DECIMAL_FLOAT;
620}
621
622/* True if the target supports fixed-point arithmetic. */
623
624bool
625default_fixed_point_supported_p (void)
626{
627 return ENABLE_FIXED_POINT;
628}
629
630/* True if the target supports GNU indirect functions. */
631
632bool
633default_has_ifunc_p (void)
634{
635 return HAVE_GNU_INDIRECT_FUNCTION;
636}
637
638/* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
639 an error message.
640
641 This function checks whether a given INSN is valid within a low-overhead
642 loop. If INSN is invalid it returns the reason for that, otherwise it
643 returns NULL. A called function may clobber any special registers required
644 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
645 register for branch on table instructions. We reject the doloop pattern in
646 these cases. */
647
648const char *
649default_invalid_within_doloop (const rtx_insn *insn)
650{
651 if (CALL_P (insn))
652 return "Function call in loop.";
653
654 if (tablejump_p (insn, NULL, NULL) || computed_jump_p (insn))
655 return "Computed branch in the loop.";
656
657 return NULL;
658}
659
660/* Mapping of builtin functions to vectorized variants. */
661
662tree
663default_builtin_vectorized_function (unsigned int, tree, tree)
664{
665 return NULL_TREE;
666}
667
668/* Mapping of target builtin functions to vectorized variants. */
669
670tree
671default_builtin_md_vectorized_function (tree, tree, tree)
672{
673 return NULL_TREE;
674}
675
676/* Vectorized conversion. */
677
678tree
679default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED,
680 tree dest_type ATTRIBUTE_UNUSED,
681 tree src_type ATTRIBUTE_UNUSED)
682{
683 return NULL_TREE;
684}
685
686/* Default vectorizer cost model values. */
687
688int
689default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
690 tree vectype,
691 int misalign ATTRIBUTE_UNUSED)
692{
693 switch (type_of_cost)
694 {
695 case scalar_stmt:
696 case scalar_load:
697 case scalar_store:
698 case vector_stmt:
699 case vector_load:
700 case vector_store:
701 case vec_to_scalar:
702 case scalar_to_vec:
703 case cond_branch_not_taken:
704 case vec_perm:
705 case vec_promote_demote:
706 return 1;
707
708 case unaligned_load:
709 case unaligned_store:
710 return 2;
711
712 case cond_branch_taken:
713 return 3;
714
715 case vec_construct:
716 return TYPE_VECTOR_SUBPARTS (vectype) - 1;
717
718 default:
719 gcc_unreachable ();
720 }
721}
722
723/* Reciprocal. */
724
725tree
726default_builtin_reciprocal (tree)
727{
728 return NULL_TREE;
729}
730
731bool
732hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
733 cumulative_args_t ca ATTRIBUTE_UNUSED,
734 machine_mode mode ATTRIBUTE_UNUSED,
735 const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
736{
737 return false;
738}
739
740bool
741hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
742 cumulative_args_t ca ATTRIBUTE_UNUSED,
743 machine_mode mode ATTRIBUTE_UNUSED,
744 const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
745{
746 return true;
747}
748
749int
750hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
751 cumulative_args_t ca ATTRIBUTE_UNUSED,
752 machine_mode mode ATTRIBUTE_UNUSED,
753 tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
754{
755 return 0;
756}
757
758void
759hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED,
760 tree ATTRIBUTE_UNUSED)
761{
762}
763
764void
765default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED,
766 machine_mode mode ATTRIBUTE_UNUSED,
767 const_tree type ATTRIBUTE_UNUSED,
768 bool named ATTRIBUTE_UNUSED)
769{
770 gcc_unreachable ();
771}
772
773/* Default implementation of TARGET_FUNCTION_ARG_OFFSET. */
774
775HOST_WIDE_INT
776default_function_arg_offset (machine_mode, const_tree)
777{
778 return 0;
779}
780
781/* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
782 upward, but pad short args downward on big-endian machines. */
783
784pad_direction
785default_function_arg_padding (machine_mode mode, const_tree type)
786{
787 if (!BYTES_BIG_ENDIAN)
788 return PAD_UPWARD;
789
790 unsigned HOST_WIDE_INT size;
791 if (mode == BLKmode)
792 {
793 if (!type || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
794 return PAD_UPWARD;
795 size = int_size_in_bytes (type);
796 }
797 else
798 size = GET_MODE_SIZE (mode);
799
800 if (size < (PARM_BOUNDARY / BITS_PER_UNIT))
801 return PAD_DOWNWARD;
802
803 return PAD_UPWARD;
804}
805
806rtx
807default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
808 machine_mode mode ATTRIBUTE_UNUSED,
809 const_tree type ATTRIBUTE_UNUSED,
810 bool named ATTRIBUTE_UNUSED)
811{
812 gcc_unreachable ();
813}
814
815rtx
816default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
817 machine_mode mode ATTRIBUTE_UNUSED,
818 const_tree type ATTRIBUTE_UNUSED,
819 bool named ATTRIBUTE_UNUSED)
820{
821 gcc_unreachable ();
822}
823
824unsigned int
825default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED,
826 const_tree type ATTRIBUTE_UNUSED)
827{
828 return PARM_BOUNDARY;
829}
830
831unsigned int
832default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED,
833 const_tree type ATTRIBUTE_UNUSED)
834{
835 return PARM_BOUNDARY;
836}
837
838void
839hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
840{
841}
842
843const char *
844hook_invalid_arg_for_unprototyped_fn (
845 const_tree typelist ATTRIBUTE_UNUSED,
846 const_tree funcdecl ATTRIBUTE_UNUSED,
847 const_tree val ATTRIBUTE_UNUSED)
848{
849 return NULL;
850}
851
852/* Initialize the stack protection decls. */
853
854/* Stack protection related decls living in libgcc. */
855static GTY(()) tree stack_chk_guard_decl;
856
857tree
858default_stack_protect_guard (void)
859{
860 tree t = stack_chk_guard_decl;
861
862 if (t == NULL)
863 {
864 rtx x;
865
866 t = build_decl (UNKNOWN_LOCATION,
867 VAR_DECL, get_identifier ("__stack_chk_guard"),
868 ptr_type_node);
869 TREE_STATIC (t) = 1;
870 TREE_PUBLIC (t) = 1;
871 DECL_EXTERNAL (t) = 1;
872 TREE_USED (t) = 1;
873 TREE_THIS_VOLATILE (t) = 1;
874 DECL_ARTIFICIAL (t) = 1;
875 DECL_IGNORED_P (t) = 1;
876
877 /* Do not share RTL as the declaration is visible outside of
878 current function. */
879 x = DECL_RTL (t);
880 RTX_FLAG (x, used) = 1;
881
882 stack_chk_guard_decl = t;
883 }
884
885 return t;
886}
887
888static GTY(()) tree stack_chk_fail_decl;
889
890tree
891default_external_stack_protect_fail (void)
892{
893 tree t = stack_chk_fail_decl;
894
895 if (t == NULL_TREE)
896 {
897 t = build_function_type_list (void_type_node, NULL_TREE);
898 t = build_decl (UNKNOWN_LOCATION,
899 FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
900 TREE_STATIC (t) = 1;
901 TREE_PUBLIC (t) = 1;
902 DECL_EXTERNAL (t) = 1;
903 TREE_USED (t) = 1;
904 TREE_THIS_VOLATILE (t) = 1;
905 TREE_NOTHROW (t) = 1;
906 DECL_ARTIFICIAL (t) = 1;
907 DECL_IGNORED_P (t) = 1;
908 DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
909 DECL_VISIBILITY_SPECIFIED (t) = 1;
910
911 stack_chk_fail_decl = t;
912 }
913
914 return build_call_expr (t, 0);
915}
916
917tree
918default_hidden_stack_protect_fail (void)
919{
920#ifndef HAVE_GAS_HIDDEN
921 return default_external_stack_protect_fail ();
922#else
923 tree t = stack_chk_fail_decl;
924
925 if (!flag_pic)
926 return default_external_stack_protect_fail ();
927
928 if (t == NULL_TREE)
929 {
930 t = build_function_type_list (void_type_node, NULL_TREE);
931 t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
932 get_identifier ("__stack_chk_fail_local"), t);
933 TREE_STATIC (t) = 1;
934 TREE_PUBLIC (t) = 1;
935 DECL_EXTERNAL (t) = 1;
936 TREE_USED (t) = 1;
937 TREE_THIS_VOLATILE (t) = 1;
938 TREE_NOTHROW (t) = 1;
939 DECL_ARTIFICIAL (t) = 1;
940 DECL_IGNORED_P (t) = 1;
941 DECL_VISIBILITY_SPECIFIED (t) = 1;
942 DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
943
944 stack_chk_fail_decl = t;
945 }
946
947 return build_call_expr (t, 0);
948#endif
949}
950
951bool
952hook_bool_const_rtx_commutative_p (const_rtx x,
953 int outer_code ATTRIBUTE_UNUSED)
954{
955 return COMMUTATIVE_P (x);
956}
957
958rtx
959default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
960 const_tree fn_decl_or_type,
961 bool outgoing ATTRIBUTE_UNUSED)
962{
963 /* The old interface doesn't handle receiving the function type. */
964 if (fn_decl_or_type
965 && !DECL_P (fn_decl_or_type))
966 fn_decl_or_type = NULL;
967
968#ifdef FUNCTION_VALUE
969 return FUNCTION_VALUE (ret_type, fn_decl_or_type);
970#else
971 gcc_unreachable ();
972#endif
973}
974
975rtx
976default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED,
977 const_rtx fun ATTRIBUTE_UNUSED)
978{
979#ifdef LIBCALL_VALUE
980 return LIBCALL_VALUE (mode);
981#else
982 gcc_unreachable ();
983#endif
984}
985
986/* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
987
988bool
989default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
990{
991#ifdef FUNCTION_VALUE_REGNO_P
992 return FUNCTION_VALUE_REGNO_P (regno);
993#else
994 gcc_unreachable ();
995#endif
996}
997
998rtx
999default_internal_arg_pointer (void)
1000{
1001 /* If the reg that the virtual arg pointer will be translated into is
1002 not a fixed reg or is the stack pointer, make a copy of the virtual
1003 arg pointer, and address parms via the copy. The frame pointer is
1004 considered fixed even though it is not marked as such. */
1005 if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
1006 || ! (fixed_regs[ARG_POINTER_REGNUM]
1007 || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
1008 return copy_to_reg (virtual_incoming_args_rtx);
1009 else
1010 return virtual_incoming_args_rtx;
1011}
1012
1013rtx
1014default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p)
1015{
1016 if (incoming_p)
1017 {
1018#ifdef STATIC_CHAIN_INCOMING_REGNUM
1019 return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
1020#endif
1021 }
1022
1023#ifdef STATIC_CHAIN_REGNUM
1024 return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
1025#endif
1026
1027 {
1028 static bool issued_error;
1029 if (!issued_error)
1030 {
1031 issued_error = true;
1032 sorry ("nested functions not supported on this target");
1033 }
1034
1035 /* It really doesn't matter what we return here, so long at it
1036 doesn't cause the rest of the compiler to crash. */
1037 return gen_rtx_MEM (Pmode, stack_pointer_rtx);
1038 }
1039}
1040
1041void
1042default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
1043 rtx ARG_UNUSED (r_chain))
1044{
1045 sorry ("nested function trampolines not supported on this target");
1046}
1047
1048int
1049default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED,
1050 tree funtype ATTRIBUTE_UNUSED,
1051 int size ATTRIBUTE_UNUSED)
1052{
1053 return 0;
1054}
1055
1056reg_class_t
1057default_branch_target_register_class (void)
1058{
1059 return NO_REGS;
1060}
1061
1062reg_class_t
1063default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED,
1064 reg_class_t cl,
1065 reg_class_t best_cl ATTRIBUTE_UNUSED)
1066{
1067 return cl;
1068}
1069
1070extern bool
1071default_lra_p (void)
1072{
1073 return true;
1074}
1075
1076int
1077default_register_priority (int hard_regno ATTRIBUTE_UNUSED)
1078{
1079 return 0;
1080}
1081
1082extern bool
1083default_register_usage_leveling_p (void)
1084{
1085 return false;
1086}
1087
1088extern bool
1089default_different_addr_displacement_p (void)
1090{
1091 return false;
1092}
1093
1094reg_class_t
1095default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
1096 reg_class_t reload_class_i ATTRIBUTE_UNUSED,
1097 machine_mode reload_mode ATTRIBUTE_UNUSED,
1098 secondary_reload_info *sri)
1099{
1100 enum reg_class rclass = NO_REGS;
1101 enum reg_class reload_class = (enum reg_class) reload_class_i;
1102
1103 if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
1104 {
1105 sri->icode = sri->prev_sri->t_icode;
1106 return NO_REGS;
1107 }
1108#ifdef SECONDARY_INPUT_RELOAD_CLASS
1109 if (in_p)
1110 rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x);
1111#endif
1112#ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1113 if (! in_p)
1114 rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x);
1115#endif
1116 if (rclass != NO_REGS)
1117 {
1118 enum insn_code icode
1119 = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
1120 reload_mode);
1121
1122 if (icode != CODE_FOR_nothing
1123 && !insn_operand_matches (icode, in_p, x))
1124 icode = CODE_FOR_nothing;
1125 else if (icode != CODE_FOR_nothing)
1126 {
1127 const char *insn_constraint, *scratch_constraint;
1128 enum reg_class insn_class, scratch_class;
1129
1130 gcc_assert (insn_data[(int) icode].n_operands == 3);
1131 insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
1132 if (!*insn_constraint)
1133 insn_class = ALL_REGS;
1134 else
1135 {
1136 if (in_p)
1137 {
1138 gcc_assert (*insn_constraint == '=');
1139 insn_constraint++;
1140 }
1141 insn_class = (reg_class_for_constraint
1142 (lookup_constraint (insn_constraint)));
1143 gcc_assert (insn_class != NO_REGS);
1144 }
1145
1146 scratch_constraint = insn_data[(int) icode].operand[2].constraint;
1147 /* The scratch register's constraint must start with "=&",
1148 except for an input reload, where only "=" is necessary,
1149 and where it might be beneficial to re-use registers from
1150 the input. */
1151 gcc_assert (scratch_constraint[0] == '='
1152 && (in_p || scratch_constraint[1] == '&'));
1153 scratch_constraint++;
1154 if (*scratch_constraint == '&')
1155 scratch_constraint++;
1156 scratch_class = (reg_class_for_constraint
1157 (lookup_constraint (scratch_constraint)));
1158
1159 if (reg_class_subset_p (reload_class, insn_class))
1160 {
1161 gcc_assert (scratch_class == rclass);
1162 rclass = NO_REGS;
1163 }
1164 else
1165 rclass = insn_class;
1166
1167 }
1168 if (rclass == NO_REGS)
1169 sri->icode = icode;
1170 else
1171 sri->t_icode = icode;
1172 }
1173 return rclass;
1174}
1175
1176/* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE. */
1177
1178machine_mode
1179default_secondary_memory_needed_mode (machine_mode mode)
1180{
1181 if (!targetm.lra_p ()
1182 && GET_MODE_BITSIZE (mode) < BITS_PER_WORD
1183 && INTEGRAL_MODE_P (mode))
1184 return mode_for_size (BITS_PER_WORD, GET_MODE_CLASS (mode), 0).require ();
1185 return mode;
1186}
1187
1188/* By default, if flag_pic is true, then neither local nor global relocs
1189 should be placed in readonly memory. */
1190
1191int
1192default_reloc_rw_mask (void)
1193{
1194 return flag_pic ? 3 : 0;
1195}
1196
1197/* By default, do no modification. */
1198tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
1199 tree id)
1200{
1201 return id;
1202}
1203
1204/* The default implementation of TARGET_STATIC_RTX_ALIGNMENT. */
1205
1206HOST_WIDE_INT
1207default_static_rtx_alignment (machine_mode mode)
1208{
1209 return GET_MODE_ALIGNMENT (mode);
1210}
1211
1212/* The default implementation of TARGET_CONSTANT_ALIGNMENT. */
1213
1214HOST_WIDE_INT
1215default_constant_alignment (const_tree, HOST_WIDE_INT align)
1216{
1217 return align;
1218}
1219
1220/* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1221 to at least BITS_PER_WORD but otherwise makes no changes. */
1222
1223HOST_WIDE_INT
1224constant_alignment_word_strings (const_tree exp, HOST_WIDE_INT align)
1225{
1226 if (TREE_CODE (exp) == STRING_CST)
1227 return MAX (align, BITS_PER_WORD);
1228 return align;
1229}
1230
1231/* Default to natural alignment for vector types. */
1232HOST_WIDE_INT
1233default_vector_alignment (const_tree type)
1234{
1235 HOST_WIDE_INT align = tree_to_shwi (TYPE_SIZE (type));
1236 if (align > MAX_OFILE_ALIGNMENT)
1237 align = MAX_OFILE_ALIGNMENT;
1238 return align;
1239}
1240
1241/* The default implementation of
1242 TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT. */
1243
1244HOST_WIDE_INT
1245default_preferred_vector_alignment (const_tree type)
1246{
1247 return TYPE_ALIGN (type);
1248}
1249
1250/* By default assume vectors of element TYPE require a multiple of the natural
1251 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1252bool
1253default_builtin_vector_alignment_reachable (const_tree /*type*/, bool is_packed)
1254{
1255 return ! is_packed;
1256}
1257
1258/* By default, assume that a target supports any factor of misalignment
1259 memory access if it supports movmisalign patten.
1260 is_packed is true if the memory access is defined in a packed struct. */
1261bool
1262default_builtin_support_vector_misalignment (machine_mode mode,
1263 const_tree type
1264 ATTRIBUTE_UNUSED,
1265 int misalignment
1266 ATTRIBUTE_UNUSED,
1267 bool is_packed
1268 ATTRIBUTE_UNUSED)
1269{
1270 if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
1271 return true;
1272 return false;
1273}
1274
1275/* By default, only attempt to parallelize bitwise operations, and
1276 possibly adds/subtracts using bit-twiddling. */
1277
1278machine_mode
1279default_preferred_simd_mode (scalar_mode)
1280{
1281 return word_mode;
1282}
1283
1284/* By default only the size derived from the preferred vector mode
1285 is tried. */
1286
1287unsigned int
1288default_autovectorize_vector_sizes (void)
1289{
1290 return 0;
1291}
1292
1293/* By defaults a vector of integers is used as a mask. */
1294
1295opt_machine_mode
1296default_get_mask_mode (unsigned nunits, unsigned vector_size)
1297{
1298 unsigned elem_size = vector_size / nunits;
1299 scalar_int_mode elem_mode
1300 = smallest_int_mode_for_size (elem_size * BITS_PER_UNIT);
1301 machine_mode vector_mode;
1302
1303 gcc_assert (elem_size * nunits == vector_size);
1304
1305 if (mode_for_vector (elem_mode, nunits).exists (&vector_mode)
1306 && VECTOR_MODE_P (vector_mode)
1307 && targetm.vector_mode_supported_p (vector_mode))
1308 return vector_mode;
1309
1310 return opt_machine_mode ();
1311}
1312
1313/* By default, the cost model accumulates three separate costs (prologue,
1314 loop body, and epilogue) for a vectorized loop or block. So allocate an
1315 array of three unsigned ints, set it to zero, and return its address. */
1316
1317void *
1318default_init_cost (struct loop *loop_info ATTRIBUTE_UNUSED)
1319{
1320 unsigned *cost = XNEWVEC (unsigned, 3);
1321 cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0;
1322 return cost;
1323}
1324
1325/* By default, the cost model looks up the cost of the given statement
1326 kind and mode, multiplies it by the occurrence count, accumulates
1327 it into the cost specified by WHERE, and returns the cost added. */
1328
1329unsigned
1330default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
1331 struct _stmt_vec_info *stmt_info, int misalign,
1332 enum vect_cost_model_location where)
1333{
1334 unsigned *cost = (unsigned *) data;
1335 unsigned retval = 0;
1336
1337 tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE;
1338 int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype,
1339 misalign);
1340 /* Statements in an inner loop relative to the loop being
1341 vectorized are weighted more heavily. The value here is
1342 arbitrary and could potentially be improved with analysis. */
1343 if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info))
1344 count *= 50; /* FIXME. */
1345
1346 retval = (unsigned) (count * stmt_cost);
1347 cost[where] += retval;
1348
1349 return retval;
1350}
1351
1352/* By default, the cost model just returns the accumulated costs. */
1353
1354void
1355default_finish_cost (void *data, unsigned *prologue_cost,
1356 unsigned *body_cost, unsigned *epilogue_cost)
1357{
1358 unsigned *cost = (unsigned *) data;
1359 *prologue_cost = cost[vect_prologue];
1360 *body_cost = cost[vect_body];
1361 *epilogue_cost = cost[vect_epilogue];
1362}
1363
1364/* Free the cost data. */
1365
1366void
1367default_destroy_cost_data (void *data)
1368{
1369 free (data);
1370}
1371
1372/* Determine whether or not a pointer mode is valid. Assume defaults
1373 of ptr_mode or Pmode - can be overridden. */
1374bool
1375default_valid_pointer_mode (scalar_int_mode mode)
1376{
1377 return (mode == ptr_mode || mode == Pmode);
1378}
1379
1380/* Determine whether the memory reference specified by REF may alias
1381 the C libraries errno location. */
1382bool
1383default_ref_may_alias_errno (ao_ref *ref)
1384{
1385 tree base = ao_ref_base (ref);
1386 /* The default implementation assumes the errno location is
1387 a declaration of type int or is always accessed via a
1388 pointer to int. We assume that accesses to errno are
1389 not deliberately obfuscated (even in conforming ways). */
1390 if (TYPE_UNSIGNED (TREE_TYPE (base))
1391 || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1392 return false;
1393 /* The default implementation assumes an errno location
1394 declaration is never defined in the current compilation unit. */
1395 if (DECL_P (base)
1396 && !TREE_STATIC (base))
1397 return true;
1398 else if (TREE_CODE (base) == MEM_REF
1399 && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1400 {
1401 struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1402 return !pi || pi->pt.anything || pi->pt.nonlocal;
1403 }
1404 return false;
1405}
1406
1407/* Return the mode for a pointer to a given ADDRSPACE,
1408 defaulting to ptr_mode for all address spaces. */
1409
1410scalar_int_mode
1411default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1412{
1413 return ptr_mode;
1414}
1415
1416/* Return the mode for an address in a given ADDRSPACE,
1417 defaulting to Pmode for all address spaces. */
1418
1419scalar_int_mode
1420default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1421{
1422 return Pmode;
1423}
1424
1425/* Named address space version of valid_pointer_mode.
1426 To match the above, the same modes apply to all address spaces. */
1427
1428bool
1429default_addr_space_valid_pointer_mode (scalar_int_mode mode,
1430 addr_space_t as ATTRIBUTE_UNUSED)
1431{
1432 return targetm.valid_pointer_mode (mode);
1433}
1434
1435/* Some places still assume that all pointer or address modes are the
1436 standard Pmode and ptr_mode. These optimizations become invalid if
1437 the target actually supports multiple different modes. For now,
1438 we disable such optimizations on such targets, using this function. */
1439
1440bool
1441target_default_pointer_address_modes_p (void)
1442{
1443 if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1444 return false;
1445 if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1446 return false;
1447
1448 return true;
1449}
1450
1451/* Named address space version of legitimate_address_p.
1452 By default, all address spaces have the same form. */
1453
1454bool
1455default_addr_space_legitimate_address_p (machine_mode mode, rtx mem,
1456 bool strict,
1457 addr_space_t as ATTRIBUTE_UNUSED)
1458{
1459 return targetm.legitimate_address_p (mode, mem, strict);
1460}
1461
1462/* Named address space version of LEGITIMIZE_ADDRESS.
1463 By default, all address spaces have the same form. */
1464
1465rtx
1466default_addr_space_legitimize_address (rtx x, rtx oldx, machine_mode mode,
1467 addr_space_t as ATTRIBUTE_UNUSED)
1468{
1469 return targetm.legitimize_address (x, oldx, mode);
1470}
1471
1472/* The default hook for determining if one named address space is a subset of
1473 another and to return which address space to use as the common address
1474 space. */
1475
1476bool
1477default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1478{
1479 return (subset == superset);
1480}
1481
1482/* The default hook for determining if 0 within a named address
1483 space is a valid address. */
1484
1485bool
1486default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED)
1487{
1488 return false;
1489}
1490
1491/* The default hook for debugging the address space is to return the
1492 address space number to indicate DW_AT_address_class. */
1493int
1494default_addr_space_debug (addr_space_t as)
1495{
1496 return as;
1497}
1498
1499/* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1500 Don't complain about any address space. */
1501
1502void
1503default_addr_space_diagnose_usage (addr_space_t, location_t)
1504{
1505}
1506
1507
1508/* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1509 called for targets with only a generic address space. */
1510
1511rtx
1512default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1513 tree from_type ATTRIBUTE_UNUSED,
1514 tree to_type ATTRIBUTE_UNUSED)
1515{
1516 gcc_unreachable ();
1517}
1518
1519/* The defualt implementation of TARGET_HARD_REGNO_NREGS. */
1520
1521unsigned int
1522default_hard_regno_nregs (unsigned int, machine_mode mode)
1523{
1524 return CEIL (GET_MODE_SIZE (mode), UNITS_PER_WORD);
1525}
1526
1527bool
1528default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1529{
1530 return true;
1531}
1532
1533/* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1534
1535bool
1536default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED,
1537 addr_space_t addrspace ATTRIBUTE_UNUSED)
1538{
1539 return false;
1540}
1541
1542bool
1543default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1544 tree ARG_UNUSED (name),
1545 tree ARG_UNUSED (args),
1546 int ARG_UNUSED (flags))
1547{
1548 warning (OPT_Wattributes,
1549 "target attribute is not supported on this machine");
1550
1551 return false;
1552}
1553
1554bool
1555default_target_option_pragma_parse (tree ARG_UNUSED (args),
1556 tree ARG_UNUSED (pop_target))
1557{
1558 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1559 emit no warning because "#pragma GCC pop_target" is valid on targets that
1560 do not have the "target" pragma. */
1561 if (args)
1562 warning (OPT_Wpragmas,
1563 "#pragma GCC target is not supported for this machine");
1564
1565 return false;
1566}
1567
1568bool
1569default_target_can_inline_p (tree caller, tree callee)
1570{
1571 tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1572 tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1573 if (! callee_opts)
1574 callee_opts = target_option_default_node;
1575 if (! caller_opts)
1576 caller_opts = target_option_default_node;
1577
1578 /* If both caller and callee have attributes, assume that if the
1579 pointer is different, the two functions have different target
1580 options since build_target_option_node uses a hash table for the
1581 options. */
1582 return callee_opts == caller_opts;
1583}
1584
1585/* If the machine does not have a case insn that compares the bounds,
1586 this means extra overhead for dispatch tables, which raises the
1587 threshold for using them. */
1588
1589unsigned int
1590default_case_values_threshold (void)
1591{
1592 return (targetm.have_casesi () ? 4 : 5);
1593}
1594
1595bool
1596default_have_conditional_execution (void)
1597{
1598 return HAVE_conditional_execution;
1599}
1600
1601/* By default we assume that c99 functions are present at the runtime,
1602 but sincos is not. */
1603bool
1604default_libc_has_function (enum function_class fn_class)
1605{
1606 if (fn_class == function_c94
1607 || fn_class == function_c99_misc
1608 || fn_class == function_c99_math_complex)
1609 return true;
1610
1611 return false;
1612}
1613
1614bool
1615gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1616{
1617 return true;
1618}
1619
1620bool
1621no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1622{
1623 return false;
1624}
1625
1626tree
1627default_builtin_tm_load_store (tree ARG_UNUSED (type))
1628{
1629 return NULL_TREE;
1630}
1631
1632/* Compute cost of moving registers to/from memory. */
1633
1634int
1635default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1636 reg_class_t rclass ATTRIBUTE_UNUSED,
1637 bool in ATTRIBUTE_UNUSED)
1638{
1639#ifndef MEMORY_MOVE_COST
1640 return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1641#else
1642 return MEMORY_MOVE_COST (mode, (enum reg_class) rclass, in);
1643#endif
1644}
1645
1646/* Compute cost of moving data from a register of class FROM to one of
1647 TO, using MODE. */
1648
1649int
1650default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1651 reg_class_t from ATTRIBUTE_UNUSED,
1652 reg_class_t to ATTRIBUTE_UNUSED)
1653{
1654#ifndef REGISTER_MOVE_COST
1655 return 2;
1656#else
1657 return REGISTER_MOVE_COST (mode, (enum reg_class) from, (enum reg_class) to);
1658#endif
1659}
1660
1661/* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS. */
1662
1663bool
1664default_slow_unaligned_access (machine_mode, unsigned int)
1665{
1666 return STRICT_ALIGNMENT;
1667}
1668
1669/* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1670 behavior. SPEED_P is true if we are compiling for speed. */
1671
1672unsigned int
1673get_move_ratio (bool speed_p ATTRIBUTE_UNUSED)
1674{
1675 unsigned int move_ratio;
1676#ifdef MOVE_RATIO
1677 move_ratio = (unsigned int) MOVE_RATIO (speed_p);
1678#else
1679#if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1680 move_ratio = 2;
1681#else /* No movmem patterns, pick a default. */
1682 move_ratio = ((speed_p) ? 15 : 3);
1683#endif
1684#endif
1685 return move_ratio;
1686}
1687
1688/* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1689 used; return FALSE if the movmem/setmem optab should be expanded, or
1690 a call to memcpy emitted. */
1691
1692bool
1693default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size,
1694 unsigned int alignment,
1695 enum by_pieces_operation op,
1696 bool speed_p)
1697{
1698 unsigned int max_size = 0;
1699 unsigned int ratio = 0;
1700
1701 switch (op)
1702 {
1703 case CLEAR_BY_PIECES:
1704 max_size = STORE_MAX_PIECES;
1705 ratio = CLEAR_RATIO (speed_p);
1706 break;
1707 case MOVE_BY_PIECES:
1708 max_size = MOVE_MAX_PIECES;
1709 ratio = get_move_ratio (speed_p);
1710 break;
1711 case SET_BY_PIECES:
1712 max_size = STORE_MAX_PIECES;
1713 ratio = SET_RATIO (speed_p);
1714 break;
1715 case STORE_BY_PIECES:
1716 max_size = STORE_MAX_PIECES;
1717 ratio = get_move_ratio (speed_p);
1718 break;
1719 case COMPARE_BY_PIECES:
1720 max_size = COMPARE_MAX_PIECES;
1721 /* Pick a likely default, just as in get_move_ratio. */
1722 ratio = speed_p ? 15 : 3;
1723 break;
1724 }
1725
1726 return by_pieces_ninsns (size, alignment, max_size + 1, op) < ratio;
1727}
1728
1729/* This hook controls code generation for expanding a memcmp operation by
1730 pieces. Return 1 for the normal pattern of compare/jump after each pair
1731 of loads, or a higher number to reduce the number of branches. */
1732
1733int
1734default_compare_by_pieces_branch_ratio (machine_mode)
1735{
1736 return 1;
1737}
1738
1739/* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1740 entry. If RECORD_P is true and the target supports named sections,
1741 the location of the NOPs will be recorded in a special object section
1742 called "__patchable_function_entries". This routine may be called
1743 twice per function to put NOPs before and after the function
1744 entry. */
1745
1746void
1747default_print_patchable_function_entry (FILE *file,
1748 unsigned HOST_WIDE_INT patch_area_size,
1749 bool record_p)
1750{
1751 const char *nop_templ = 0;
1752 int code_num;
1753 rtx_insn *my_nop = make_insn_raw (gen_nop ());
1754
1755 /* We use the template alone, relying on the (currently sane) assumption
1756 that the NOP template does not have variable operands. */
1757 code_num = recog_memoized (my_nop);
1758 nop_templ = get_insn_template (code_num, my_nop);
1759
1760 if (record_p && targetm_common.have_named_sections)
1761 {
1762 char buf[256];
1763 static int patch_area_number;
1764 section *previous_section = in_section;
1765
1766 patch_area_number++;
1767 ASM_GENERATE_INTERNAL_LABEL (buf, "LPFE", patch_area_number);
1768
1769 switch_to_section (get_section ("__patchable_function_entries",
1770 0, NULL));
1771 fputs (integer_asm_op (POINTER_SIZE_UNITS, false), file);
1772 assemble_name_raw (file, buf);
1773 fputc ('\n', file);
1774
1775 switch_to_section (previous_section);
1776 ASM_OUTPUT_LABEL (file, buf);
1777 }
1778
1779 unsigned i;
1780 for (i = 0; i < patch_area_size; ++i)
1781 fprintf (file, "\t%s\n", nop_templ);
1782}
1783
1784bool
1785default_profile_before_prologue (void)
1786{
1787#ifdef PROFILE_BEFORE_PROLOGUE
1788 return true;
1789#else
1790 return false;
1791#endif
1792}
1793
1794/* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1795
1796reg_class_t
1797default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1798 reg_class_t rclass)
1799{
1800#ifdef PREFERRED_RELOAD_CLASS
1801 return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1802#else
1803 return rclass;
1804#endif
1805}
1806
1807/* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1808
1809reg_class_t
1810default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1811 reg_class_t rclass)
1812{
1813 return rclass;
1814}
1815
1816/* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1817reg_class_t
1818default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1819{
1820 return NO_REGS;
1821}
1822
1823/* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1824
1825bool
1826default_class_likely_spilled_p (reg_class_t rclass)
1827{
1828 return (reg_class_size[(int) rclass] == 1);
1829}
1830
1831/* The default implementation of TARGET_CLASS_MAX_NREGS. */
1832
1833unsigned char
1834default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED,
1835 machine_mode mode ATTRIBUTE_UNUSED)
1836{
1837#ifdef CLASS_MAX_NREGS
1838 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass, mode);
1839#else
1840 return ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD);
1841#endif
1842}
1843
1844/* Determine the debugging unwind mechanism for the target. */
1845
1846enum unwind_info_type
1847default_debug_unwind_info (void)
1848{
1849 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1850 /* ??? Change all users to the hook, then poison this. */
1851#ifdef DWARF2_FRAME_INFO
1852 if (DWARF2_FRAME_INFO)
1853 return UI_DWARF2;
1854#endif
1855
1856 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1857#ifdef DWARF2_DEBUGGING_INFO
1858 if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1859 return UI_DWARF2;
1860#endif
1861
1862 return UI_NONE;
1863}
1864
1865/* Determine the correct mode for a Dwarf frame register that represents
1866 register REGNO. */
1867
1868machine_mode
1869default_dwarf_frame_reg_mode (int regno)
1870{
1871 machine_mode save_mode = reg_raw_mode[regno];
1872
1873 if (targetm.hard_regno_call_part_clobbered (regno, save_mode))
1874 save_mode = choose_hard_reg_mode (regno, 1, true);
1875 return save_mode;
1876}
1877
1878/* To be used by targets where reg_raw_mode doesn't return the right
1879 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1880
1881fixed_size_mode
1882default_get_reg_raw_mode (int regno)
1883{
1884 /* Targets must override this hook if the underlying register is
1885 variable-sized. */
1886 return as_a <fixed_size_mode> (reg_raw_mode[regno]);
1887}
1888
1889/* Return true if a leaf function should stay leaf even with profiling
1890 enabled. */
1891
1892bool
1893default_keep_leaf_when_profiled ()
1894{
1895 return false;
1896}
1897
1898/* Return true if the state of option OPTION should be stored in PCH files
1899 and checked by default_pch_valid_p. Store the option's current state
1900 in STATE if so. */
1901
1902static inline bool
1903option_affects_pch_p (int option, struct cl_option_state *state)
1904{
1905 if ((cl_options[option].flags & CL_TARGET) == 0)
1906 return false;
1907 if ((cl_options[option].flags & CL_PCH_IGNORE) != 0)
1908 return false;
1909 if (option_flag_var (option, &global_options) == &target_flags)
1910 if (targetm.check_pch_target_flags)
1911 return false;
1912 return get_option_state (&global_options, option, state);
1913}
1914
1915/* Default version of get_pch_validity.
1916 By default, every flag difference is fatal; that will be mostly right for
1917 most targets, but completely right for very few. */
1918
1919void *
1920default_get_pch_validity (size_t *sz)
1921{
1922 struct cl_option_state state;
1923 size_t i;
1924 char *result, *r;
1925
1926 *sz = 2;
1927 if (targetm.check_pch_target_flags)
1928 *sz += sizeof (target_flags);
1929 for (i = 0; i < cl_options_count; i++)
1930 if (option_affects_pch_p (i, &state))
1931 *sz += state.size;
1932
1933 result = r = XNEWVEC (char, *sz);
1934 r[0] = flag_pic;
1935 r[1] = flag_pie;
1936 r += 2;
1937 if (targetm.check_pch_target_flags)
1938 {
1939 memcpy (r, &target_flags, sizeof (target_flags));
1940 r += sizeof (target_flags);
1941 }
1942
1943 for (i = 0; i < cl_options_count; i++)
1944 if (option_affects_pch_p (i, &state))
1945 {
1946 memcpy (r, state.data, state.size);
1947 r += state.size;
1948 }
1949
1950 return result;
1951}
1952
1953/* Return a message which says that a PCH file was created with a different
1954 setting of OPTION. */
1955
1956static const char *
1957pch_option_mismatch (const char *option)
1958{
1959 return xasprintf (_("created and used with differing settings of '%s'"),
1960 option);
1961}
1962
1963/* Default version of pch_valid_p. */
1964
1965const char *
1966default_pch_valid_p (const void *data_p, size_t len)
1967{
1968 struct cl_option_state state;
1969 const char *data = (const char *)data_p;
1970 size_t i;
1971
1972 /* -fpic and -fpie also usually make a PCH invalid. */
1973 if (data[0] != flag_pic)
1974 return _("created and used with different settings of -fpic");
1975 if (data[1] != flag_pie)
1976 return _("created and used with different settings of -fpie");
1977 data += 2;
1978
1979 /* Check target_flags. */
1980 if (targetm.check_pch_target_flags)
1981 {
1982 int tf;
1983 const char *r;
1984
1985 memcpy (&tf, data, sizeof (target_flags));
1986 data += sizeof (target_flags);
1987 len -= sizeof (target_flags);
1988 r = targetm.check_pch_target_flags (tf);
1989 if (r != NULL)
1990 return r;
1991 }
1992
1993 for (i = 0; i < cl_options_count; i++)
1994 if (option_affects_pch_p (i, &state))
1995 {
1996 if (memcmp (data, state.data, state.size) != 0)
1997 return pch_option_mismatch (cl_options[i].opt_text);
1998 data += state.size;
1999 len -= state.size;
2000 }
2001
2002 return NULL;
2003}
2004
2005/* Default version of cstore_mode. */
2006
2007scalar_int_mode
2008default_cstore_mode (enum insn_code icode)
2009{
2010 return as_a <scalar_int_mode> (insn_data[(int) icode].operand[0].mode);
2011}
2012
2013/* Default version of member_type_forces_blk. */
2014
2015bool
2016default_member_type_forces_blk (const_tree, machine_mode)
2017{
2018 return false;
2019}
2020
2021rtx
2022default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED,
2023 rtx ptr ATTRIBUTE_UNUSED,
2024 rtx bnd ATTRIBUTE_UNUSED)
2025{
2026 gcc_unreachable ();
2027}
2028
2029void
2030default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED,
2031 rtx addr ATTRIBUTE_UNUSED,
2032 rtx bounds ATTRIBUTE_UNUSED,
2033 rtx to ATTRIBUTE_UNUSED)
2034{
2035 gcc_unreachable ();
2036}
2037
2038rtx
2039default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED)
2040{
2041 gcc_unreachable ();
2042}
2043
2044void
2045default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED,
2046 rtx bounds ATTRIBUTE_UNUSED)
2047{
2048 gcc_unreachable ();
2049}
2050
2051/* Default version of canonicalize_comparison. */
2052
2053void
2054default_canonicalize_comparison (int *, rtx *, rtx *, bool)
2055{
2056}
2057
2058/* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
2059
2060void
2061default_atomic_assign_expand_fenv (tree *, tree *, tree *)
2062{
2063}
2064
2065#ifndef PAD_VARARGS_DOWN
2066#define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2067#endif
2068
2069/* Build an indirect-ref expression over the given TREE, which represents a
2070 piece of a va_arg() expansion. */
2071tree
2072build_va_arg_indirect_ref (tree addr)
2073{
2074 addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr);
2075 return addr;
2076}
2077
2078/* The "standard" implementation of va_arg: read the value from the
2079 current (padded) address and increment by the (padded) size. */
2080
2081tree
2082std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
2083 gimple_seq *post_p)
2084{
2085 tree addr, t, type_size, rounded_size, valist_tmp;
2086 unsigned HOST_WIDE_INT align, boundary;
2087 bool indirect;
2088
2089 /* All of the alignment and movement below is for args-grow-up machines.
2090 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2091 implement their own specialized gimplify_va_arg_expr routines. */
2092 if (ARGS_GROW_DOWNWARD)
2093 gcc_unreachable ();
2094
2095 indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false);
2096 if (indirect)
2097 type = build_pointer_type (type);
2098
2099 align = PARM_BOUNDARY / BITS_PER_UNIT;
2100 boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type);
2101
2102 /* When we align parameter on stack for caller, if the parameter
2103 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2104 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
2105 here with caller. */
2106 if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT)
2107 boundary = MAX_SUPPORTED_STACK_ALIGNMENT;
2108
2109 boundary /= BITS_PER_UNIT;
2110
2111 /* Hoist the valist value into a temporary for the moment. */
2112 valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL);
2113
2114 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
2115 requires greater alignment, we must perform dynamic alignment. */
2116 if (boundary > align
2117 && !TYPE_EMPTY_P (type)
2118 && !integer_zerop (TYPE_SIZE (type)))
2119 {
2120 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2121 fold_build_pointer_plus_hwi (valist_tmp, boundary - 1));
2122 gimplify_and_add (t, pre_p);
2123
2124 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
2125 fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist),
2126 valist_tmp,
2127 build_int_cst (TREE_TYPE (valist), -boundary)));
2128 gimplify_and_add (t, pre_p);
2129 }
2130 else
2131 boundary = align;
2132
2133 /* If the actual alignment is less than the alignment of the type,
2134 adjust the type accordingly so that we don't assume strict alignment
2135 when dereferencing the pointer. */
2136 boundary *= BITS_PER_UNIT;
2137 if (boundary < TYPE_ALIGN (type))
2138 {
2139 type = build_variant_type_copy (type);
2140 SET_TYPE_ALIGN (type, boundary);
2141 }
2142
2143 /* Compute the rounded size of the type. */
2144 type_size = arg_size_in_bytes (type);
2145 rounded_size = round_up (type_size, align);
2146
2147 /* Reduce rounded_size so it's sharable with the postqueue. */
2148 gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue);
2149
2150 /* Get AP. */
2151 addr = valist_tmp;
2152 if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size))
2153 {
2154 /* Small args are padded downward. */
2155 t = fold_build2_loc (input_location, GT_EXPR, sizetype,
2156 rounded_size, size_int (align));
2157 t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node,
2158 size_binop (MINUS_EXPR, rounded_size, type_size));
2159 addr = fold_build_pointer_plus (addr, t);
2160 }
2161
2162 /* Compute new value for AP. */
2163 t = fold_build_pointer_plus (valist_tmp, rounded_size);
2164 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t);
2165 gimplify_and_add (t, pre_p);
2166
2167 addr = fold_convert (build_pointer_type (type), addr);
2168
2169 if (indirect)
2170 addr = build_va_arg_indirect_ref (addr);
2171
2172 return build_va_arg_indirect_ref (addr);
2173}
2174
2175tree
2176default_chkp_bound_type (void)
2177{
2178 tree res = make_node (POINTER_BOUNDS_TYPE);
2179 TYPE_PRECISION (res) = TYPE_PRECISION (size_type_node) * 2;
2180 TYPE_NAME (res) = get_identifier ("__bounds_type");
2181 SET_TYPE_MODE (res, targetm.chkp_bound_mode ());
2182 layout_type (res);
2183 return res;
2184}
2185
2186machine_mode
2187default_chkp_bound_mode (void)
2188{
2189 return VOIDmode;
2190}
2191
2192tree
2193default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED)
2194{
2195 return NULL_TREE;
2196}
2197
2198rtx
2199default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED,
2200 const_tree fn_decl_or_type ATTRIBUTE_UNUSED,
2201 bool outgoing ATTRIBUTE_UNUSED)
2202{
2203 gcc_unreachable ();
2204}
2205
2206tree
2207default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED,
2208 HOST_WIDE_INT ub ATTRIBUTE_UNUSED)
2209{
2210 return NULL_TREE;
2211}
2212
2213int
2214default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED,
2215 tree lb ATTRIBUTE_UNUSED,
2216 tree ub ATTRIBUTE_UNUSED,
2217 tree *stmts ATTRIBUTE_UNUSED)
2218{
2219 return 0;
2220}
2221
2222void
2223default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED,
2224 machine_mode mode ATTRIBUTE_UNUSED,
2225 tree type ATTRIBUTE_UNUSED,
2226 int *pretend_arg_size ATTRIBUTE_UNUSED,
2227 int second_time ATTRIBUTE_UNUSED)
2228{
2229}
2230
2231/* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2232 not support nested low-overhead loops. */
2233
2234bool
2235can_use_doloop_if_innermost (const widest_int &, const widest_int &,
2236 unsigned int loop_depth, bool)
2237{
2238 return loop_depth == 1;
2239}
2240
2241/* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2242
2243bool
2244default_optab_supported_p (int, machine_mode, machine_mode, optimization_type)
2245{
2246 return true;
2247}
2248
2249/* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2250
2251unsigned int
2252default_max_noce_ifcvt_seq_cost (edge e)
2253{
2254 bool predictable_p = predictable_edge_p (e);
2255
2256 enum compiler_param param
2257 = (predictable_p
2258 ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2259 : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST);
2260
2261 /* If we have a parameter set, use that, otherwise take a guess using
2262 BRANCH_COST. */
2263 if (global_options_set.x_param_values[param])
2264 return PARAM_VALUE (param);
2265 else
2266 return BRANCH_COST (true, predictable_p) * COSTS_N_INSNS (3);
2267}
2268
2269/* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2270
2271unsigned int
2272default_min_arithmetic_precision (void)
2273{
2274 return WORD_REGISTER_OPERATIONS ? BITS_PER_WORD : BITS_PER_UNIT;
2275}
2276
2277/* Default implementation of TARGET_C_EXCESS_PRECISION. */
2278
2279enum flt_eval_method
2280default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED)
2281{
2282 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
2283}
2284
2285bool
2286default_stack_clash_protection_final_dynamic_probe (rtx residual ATTRIBUTE_UNUSED)
2287{
2288 return 0;
2289}
2290
2291#include "gt-targhooks.h"
2292