1 /* Default target hook functions.
2 Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 /* The migration of target macros to target hooks works as follows:
23 1. Create a target hook that uses the existing target macros to
24 implement the same functionality.
26 2. Convert all the MI files to use the hook instead of the macro.
28 3. Repeat for a majority of the remaining target macros. This will
31 4. Tell target maintainers to start migrating.
33 5. Eventually convert the backends to override the hook instead of
34 defining the macros. This will take some time too.
36 6. TBD when, poison the macros. Unmigrated targets will break at
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.
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.
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. */
52 #include "coretypes.h"
63 #include "target-def.h"
65 #include "hard-reg-set.h"
72 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED
,
73 rtx addr ATTRIBUTE_UNUSED
,
74 bool strict ATTRIBUTE_UNUSED
)
76 #ifdef GO_IF_LEGITIMATE_ADDRESS
77 /* Defer to the old implementation using a goto. */
79 return strict_memory_address_p (mode
, addr
);
81 return memory_address_p (mode
, addr
);
88 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
90 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
91 ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file
, fun
);
96 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
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
))
106 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
108 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
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
)
123 return promote_mode (type
, mode
, punsignedp
);
128 default_promote_function_mode_always_promote (const_tree type
,
129 enum machine_mode mode
,
131 const_tree funtype ATTRIBUTE_UNUSED
,
132 int for_return ATTRIBUTE_UNUSED
)
134 return promote_mode (type
, mode
, punsignedp
);
139 default_cc_modes_compatible (enum machine_mode m1
, enum machine_mode m2
)
147 default_return_in_memory (const_tree type
,
148 const_tree fntype ATTRIBUTE_UNUSED
)
150 return (TYPE_MODE (type
) == BLKmode
);
154 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
155 enum machine_mode mode ATTRIBUTE_UNUSED
)
161 default_expand_builtin_saveregs (void)
163 error ("__builtin_saveregs not supported by this target");
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
)
176 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
179 default_builtin_setjmp_frame_value (void)
181 return virtual_stack_vars_rtx
;
184 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
187 hook_bool_CUMULATIVE_ARGS_false (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
)
193 default_pretend_outgoing_varargs_named (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
)
195 return (targetm
.calls
.setup_incoming_varargs
196 != default_setup_incoming_varargs
);
200 default_eh_return_filter_mode (void)
202 return targetm
.unwind_word_mode ();
206 default_libgcc_cmp_return_mode (void)
212 default_libgcc_shift_count_mode (void)
218 default_unwind_word_mode (void)
223 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
225 unsigned HOST_WIDE_INT
226 default_shift_truncation_mask (enum machine_mode mode
)
228 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
231 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
234 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED
)
236 return have_insn_for (DIV
, mode
) ? 3 : 2;
239 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
242 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED
,
243 enum machine_mode mode_rep ATTRIBUTE_UNUSED
)
248 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
251 hook_bool_CUMULATIVE_ARGS_true (CUMULATIVE_ARGS
* a ATTRIBUTE_UNUSED
)
256 /* Return machine mode for non-standard suffix
257 or VOIDmode if non-standard suffixes are unsupported. */
259 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
264 /* The generic C++ ABI specifies this is a 64-bit value. */
266 default_cxx_guard_type (void)
268 return long_long_integer_type_node
;
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. */
277 default_cxx_get_cookie_size (tree type
)
281 /* We need to allocate an additional max (sizeof (size_t), alignof
282 (true_type)) bytes. */
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
;
291 cookie_size
= type_align
;
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. */
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
)
304 return targetm
.calls
.must_pass_in_stack (mode
, type
);
307 /* Return true if a parameter follows callee copies conventions. This
308 version of the hook is true for all named arguments. */
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
)
318 /* Emit any directives required to unwind this instruction. */
321 default_unwind_emit (FILE * stream ATTRIBUTE_UNUSED
,
322 rtx insn ATTRIBUTE_UNUSED
)
324 /* Should never happen. */
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.
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. */
338 default_scalar_mode_supported_p (enum machine_mode mode
)
340 int precision
= GET_MODE_PRECISION (mode
);
342 switch (GET_MODE_CLASS (mode
))
344 case MODE_PARTIAL_INT
:
346 if (precision
== CHAR_TYPE_SIZE
)
348 if (precision
== SHORT_TYPE_SIZE
)
350 if (precision
== INT_TYPE_SIZE
)
352 if (precision
== LONG_TYPE_SIZE
)
354 if (precision
== LONG_LONG_TYPE_SIZE
)
356 if (precision
== 2 * BITS_PER_WORD
)
361 if (precision
== FLOAT_TYPE_SIZE
)
363 if (precision
== DOUBLE_TYPE_SIZE
)
365 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
369 case MODE_DECIMAL_FLOAT
:
381 /* True if the target supports decimal floating point. */
384 default_decimal_float_supported_p (void)
386 return ENABLE_DECIMAL_FLOAT
;
389 /* True if the target supports fixed-point arithmetic. */
392 default_fixed_point_supported_p (void)
394 return ENABLE_FIXED_POINT
;
397 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
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
408 default_invalid_within_doloop (const_rtx insn
)
411 return "Function call in loop.";
413 if (JUMP_TABLE_DATA_P (insn
))
414 return "Computed branch in the loop.";
419 /* Mapping of builtin functions to vectorized variants. */
422 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
423 tree type_out ATTRIBUTE_UNUSED
,
424 tree type_in ATTRIBUTE_UNUSED
)
429 /* Vectorized conversion. */
432 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
433 tree dest_type ATTRIBUTE_UNUSED
,
434 tree src_type ATTRIBUTE_UNUSED
)
442 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
443 bool md_fn ATTRIBUTE_UNUSED
,
444 bool sqrt ATTRIBUTE_UNUSED
)
450 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
451 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
452 enum machine_mode mode ATTRIBUTE_UNUSED
,
453 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
459 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
460 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
461 enum machine_mode mode ATTRIBUTE_UNUSED
,
462 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
468 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
469 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
470 enum machine_mode mode ATTRIBUTE_UNUSED
,
471 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
477 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
482 hook_invalid_arg_for_unprototyped_fn (
483 const_tree typelist ATTRIBUTE_UNUSED
,
484 const_tree funcdecl ATTRIBUTE_UNUSED
,
485 const_tree val ATTRIBUTE_UNUSED
)
490 /* Initialize the stack protection decls. */
492 /* Stack protection related decls living in libgcc. */
493 static GTY(()) tree stack_chk_guard_decl
;
496 default_stack_protect_guard (void)
498 tree t
= stack_chk_guard_decl
;
502 t
= build_decl (UNKNOWN_LOCATION
,
503 VAR_DECL
, get_identifier ("__stack_chk_guard"),
507 DECL_EXTERNAL (t
) = 1;
509 TREE_THIS_VOLATILE (t
) = 1;
510 DECL_ARTIFICIAL (t
) = 1;
511 DECL_IGNORED_P (t
) = 1;
513 stack_chk_guard_decl
= t
;
519 static GTY(()) tree stack_chk_fail_decl
;
522 default_external_stack_protect_fail (void)
524 tree t
= stack_chk_fail_decl
;
528 t
= build_function_type_list (void_type_node
, NULL_TREE
);
529 t
= build_decl (UNKNOWN_LOCATION
,
530 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
533 DECL_EXTERNAL (t
) = 1;
535 TREE_THIS_VOLATILE (t
) = 1;
536 TREE_NOTHROW (t
) = 1;
537 DECL_ARTIFICIAL (t
) = 1;
538 DECL_IGNORED_P (t
) = 1;
539 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
540 DECL_VISIBILITY_SPECIFIED (t
) = 1;
542 stack_chk_fail_decl
= t
;
545 return build_call_expr (t
, 0);
549 default_hidden_stack_protect_fail (void)
551 #ifndef HAVE_GAS_HIDDEN
552 return default_external_stack_protect_fail ();
554 tree t
= stack_chk_fail_decl
;
557 return default_external_stack_protect_fail ();
561 t
= build_function_type_list (void_type_node
, NULL_TREE
);
562 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
563 get_identifier ("__stack_chk_fail_local"), t
);
566 DECL_EXTERNAL (t
) = 1;
568 TREE_THIS_VOLATILE (t
) = 1;
569 TREE_NOTHROW (t
) = 1;
570 DECL_ARTIFICIAL (t
) = 1;
571 DECL_IGNORED_P (t
) = 1;
572 DECL_VISIBILITY_SPECIFIED (t
) = 1;
573 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
575 stack_chk_fail_decl
= t
;
578 return build_call_expr (t
, 0);
583 hook_bool_const_rtx_commutative_p (const_rtx x
,
584 int outer_code ATTRIBUTE_UNUSED
)
586 return COMMUTATIVE_P (x
);
590 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
591 const_tree fn_decl_or_type
,
592 bool outgoing ATTRIBUTE_UNUSED
)
594 /* The old interface doesn't handle receiving the function type. */
596 && !DECL_P (fn_decl_or_type
))
597 fn_decl_or_type
= NULL
;
599 #ifdef FUNCTION_OUTGOING_VALUE
601 return FUNCTION_OUTGOING_VALUE (ret_type
, fn_decl_or_type
);
604 #ifdef FUNCTION_VALUE
605 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
612 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED
,
613 const_rtx fun ATTRIBUTE_UNUSED
)
616 return LIBCALL_VALUE (mode
);
623 default_internal_arg_pointer (void)
625 /* If the reg that the virtual arg pointer will be translated into is
626 not a fixed reg or is the stack pointer, make a copy of the virtual
627 arg pointer, and address parms via the copy. The frame pointer is
628 considered fixed even though it is not marked as such. */
629 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
630 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
631 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
632 return copy_to_reg (virtual_incoming_args_rtx
);
634 return virtual_incoming_args_rtx
;
638 default_static_chain (const_tree fndecl
, bool incoming_p
)
640 if (!DECL_STATIC_CHAIN (fndecl
))
645 #ifdef STATIC_CHAIN_INCOMING_REGNUM
646 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
650 #ifdef STATIC_CHAIN_REGNUM
651 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
655 static bool issued_error
;
659 sorry ("nested functions not supported on this target");
662 /* It really doesn't matter what we return here, so long at it
663 doesn't cause the rest of the compiler to crash. */
664 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
669 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
670 rtx
ARG_UNUSED (r_chain
))
672 sorry ("nested function trampolines not supported on this target");
676 default_branch_target_register_class (void)
681 #ifdef IRA_COVER_CLASSES
682 const enum reg_class
*
683 default_ira_cover_classes (void)
685 static enum reg_class classes
[] = IRA_COVER_CLASSES
;
691 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
692 enum reg_class reload_class ATTRIBUTE_UNUSED
,
693 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
694 secondary_reload_info
*sri
)
696 enum reg_class rclass
= NO_REGS
;
698 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
700 sri
->icode
= sri
->prev_sri
->t_icode
;
703 #ifdef SECONDARY_INPUT_RELOAD_CLASS
705 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
707 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
709 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
711 if (rclass
!= NO_REGS
)
713 enum insn_code icode
= (in_p
? reload_in_optab
[(int) reload_mode
]
714 : reload_out_optab
[(int) reload_mode
]);
716 if (icode
!= CODE_FOR_nothing
717 && insn_data
[(int) icode
].operand
[in_p
].predicate
718 && ! insn_data
[(int) icode
].operand
[in_p
].predicate (x
, reload_mode
))
719 icode
= CODE_FOR_nothing
;
720 else if (icode
!= CODE_FOR_nothing
)
722 const char *insn_constraint
, *scratch_constraint
;
723 char insn_letter
, scratch_letter
;
724 enum reg_class insn_class
, scratch_class
;
726 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
727 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
728 if (!*insn_constraint
)
729 insn_class
= ALL_REGS
;
734 gcc_assert (*insn_constraint
== '=');
737 insn_letter
= *insn_constraint
;
739 = (insn_letter
== 'r' ? GENERAL_REGS
740 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
742 gcc_assert (insn_class
!= NO_REGS
);
745 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
746 /* The scratch register's constraint must start with "=&",
747 except for an input reload, where only "=" is necessary,
748 and where it might be beneficial to re-use registers from
750 gcc_assert (scratch_constraint
[0] == '='
751 && (in_p
|| scratch_constraint
[1] == '&'));
752 scratch_constraint
++;
753 if (*scratch_constraint
== '&')
754 scratch_constraint
++;
755 scratch_letter
= *scratch_constraint
;
757 = (scratch_letter
== 'r' ? GENERAL_REGS
758 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
759 scratch_constraint
));
761 if (reg_class_subset_p (reload_class
, insn_class
))
763 gcc_assert (scratch_class
== rclass
);
770 if (rclass
== NO_REGS
)
773 sri
->t_icode
= icode
;
779 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
780 const char *arg ATTRIBUTE_UNUSED
,
781 int value ATTRIBUTE_UNUSED
)
786 /* By default, if flag_pic is true, then neither local nor global relocs
787 should be placed in readonly memory. */
790 default_reloc_rw_mask (void)
792 return flag_pic
? 3 : 0;
795 /* By default, do no modification. */
796 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
803 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
808 /* Assuming that types whose size is > pointer-size are not guaranteed to be
809 naturally aligned. */
810 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
813 /* Assuming that types whose size is <= pointer-size
814 are naturally aligned. */
818 /* By default, assume that a target supports any factor of misalignment
819 memory access if it supports movmisalign patten.
820 is_packed is true if the memory access is defined in a packed struct. */
822 default_builtin_support_vector_misalignment (enum machine_mode mode
,
830 if (optab_handler (movmisalign_optab
, mode
)->insn_code
!= CODE_FOR_nothing
)
835 /* Determine whether or not a pointer mode is valid. Assume defaults
836 of ptr_mode or Pmode - can be overridden. */
838 default_valid_pointer_mode (enum machine_mode mode
)
840 return (mode
== ptr_mode
|| mode
== Pmode
);
843 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
844 for the generic address space only. */
847 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
849 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
853 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
854 for the generic address space only. */
857 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
859 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
863 /* Named address space version of valid_pointer_mode. */
866 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
868 if (!ADDR_SPACE_GENERIC_P (as
))
869 return (mode
== targetm
.addr_space
.pointer_mode (as
)
870 || mode
== targetm
.addr_space
.address_mode (as
));
872 return targetm
.valid_pointer_mode (mode
);
875 /* Some places still assume that all pointer or address modes are the
876 standard Pmode and ptr_mode. These optimizations become invalid if
877 the target actually supports multiple different modes. For now,
878 we disable such optimizations on such targets, using this function. */
881 target_default_pointer_address_modes_p (void)
883 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
885 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
891 /* Named address space version of legitimate_address_p. */
894 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
895 bool strict
, addr_space_t as
)
897 if (!ADDR_SPACE_GENERIC_P (as
))
900 return targetm
.legitimate_address_p (mode
, mem
, strict
);
903 /* Named address space version of LEGITIMIZE_ADDRESS. */
906 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
907 enum machine_mode mode
, addr_space_t as
)
909 if (!ADDR_SPACE_GENERIC_P (as
))
912 return targetm
.legitimize_address (x
, oldx
, mode
);
915 /* The default hook for determining if one named address space is a subset of
916 another and to return which address space to use as the common address
920 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
922 return (subset
== superset
);
925 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
926 called for targets with only a generic address space. */
929 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
930 tree from_type ATTRIBUTE_UNUSED
,
931 tree to_type ATTRIBUTE_UNUSED
)
937 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
943 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
944 tree
ARG_UNUSED (name
),
945 tree
ARG_UNUSED (args
),
946 int ARG_UNUSED (flags
))
948 warning (OPT_Wattributes
,
949 "target attribute is not supported on this machine");
955 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
956 tree
ARG_UNUSED (pop_target
))
958 warning (OPT_Wpragmas
,
959 "#pragma GCC target is not supported for this machine");
965 default_target_can_inline_p (tree caller
, tree callee
)
968 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
969 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
971 /* If callee has no option attributes, then it is ok to inline */
975 /* If caller has no option attributes, but callee does then it is not ok to
977 else if (!caller_opts
)
980 /* If both caller and callee have attributes, assume that if the pointer is
981 different, the the two functions have different target options since
982 build_target_option_node uses a hash table for the options. */
984 ret
= (callee_opts
== caller_opts
);
990 # define HAVE_casesi 0
993 /* If the machine does not have a case insn that compares the bounds,
994 this means extra overhead for dispatch tables, which raises the
995 threshold for using them. */
997 unsigned int default_case_values_threshold (void)
999 return (HAVE_casesi
? 4 : 5);
1003 default_have_conditional_execution (void)
1005 #ifdef HAVE_conditional_execution
1006 return HAVE_conditional_execution
;
1012 #include "gt-targhooks.h"