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
);
622 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
625 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
627 #ifdef FUNCTION_VALUE_REGNO_P
628 return FUNCTION_VALUE_REGNO_P (regno
);
635 default_internal_arg_pointer (void)
637 /* If the reg that the virtual arg pointer will be translated into is
638 not a fixed reg or is the stack pointer, make a copy of the virtual
639 arg pointer, and address parms via the copy. The frame pointer is
640 considered fixed even though it is not marked as such. */
641 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
642 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
643 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
644 return copy_to_reg (virtual_incoming_args_rtx
);
646 return virtual_incoming_args_rtx
;
650 default_static_chain (const_tree fndecl
, bool incoming_p
)
652 if (!DECL_STATIC_CHAIN (fndecl
))
657 #ifdef STATIC_CHAIN_INCOMING_REGNUM
658 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
662 #ifdef STATIC_CHAIN_REGNUM
663 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
667 static bool issued_error
;
671 sorry ("nested functions not supported on this target");
674 /* It really doesn't matter what we return here, so long at it
675 doesn't cause the rest of the compiler to crash. */
676 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
681 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
682 rtx
ARG_UNUSED (r_chain
))
684 sorry ("nested function trampolines not supported on this target");
688 default_branch_target_register_class (void)
693 #ifdef IRA_COVER_CLASSES
694 const enum reg_class
*
695 default_ira_cover_classes (void)
697 static enum reg_class classes
[] = IRA_COVER_CLASSES
;
703 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
704 enum reg_class reload_class ATTRIBUTE_UNUSED
,
705 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
706 secondary_reload_info
*sri
)
708 enum reg_class rclass
= NO_REGS
;
710 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
712 sri
->icode
= sri
->prev_sri
->t_icode
;
715 #ifdef SECONDARY_INPUT_RELOAD_CLASS
717 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
719 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
721 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
723 if (rclass
!= NO_REGS
)
725 enum insn_code icode
= (in_p
? reload_in_optab
[(int) reload_mode
]
726 : reload_out_optab
[(int) reload_mode
]);
728 if (icode
!= CODE_FOR_nothing
729 && insn_data
[(int) icode
].operand
[in_p
].predicate
730 && ! insn_data
[(int) icode
].operand
[in_p
].predicate (x
, reload_mode
))
731 icode
= CODE_FOR_nothing
;
732 else if (icode
!= CODE_FOR_nothing
)
734 const char *insn_constraint
, *scratch_constraint
;
735 char insn_letter
, scratch_letter
;
736 enum reg_class insn_class
, scratch_class
;
738 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
739 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
740 if (!*insn_constraint
)
741 insn_class
= ALL_REGS
;
746 gcc_assert (*insn_constraint
== '=');
749 insn_letter
= *insn_constraint
;
751 = (insn_letter
== 'r' ? GENERAL_REGS
752 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
754 gcc_assert (insn_class
!= NO_REGS
);
757 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
758 /* The scratch register's constraint must start with "=&",
759 except for an input reload, where only "=" is necessary,
760 and where it might be beneficial to re-use registers from
762 gcc_assert (scratch_constraint
[0] == '='
763 && (in_p
|| scratch_constraint
[1] == '&'));
764 scratch_constraint
++;
765 if (*scratch_constraint
== '&')
766 scratch_constraint
++;
767 scratch_letter
= *scratch_constraint
;
769 = (scratch_letter
== 'r' ? GENERAL_REGS
770 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
771 scratch_constraint
));
773 if (reg_class_subset_p (reload_class
, insn_class
))
775 gcc_assert (scratch_class
== rclass
);
782 if (rclass
== NO_REGS
)
785 sri
->t_icode
= icode
;
791 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
792 const char *arg ATTRIBUTE_UNUSED
,
793 int value ATTRIBUTE_UNUSED
)
798 /* By default, if flag_pic is true, then neither local nor global relocs
799 should be placed in readonly memory. */
802 default_reloc_rw_mask (void)
804 return flag_pic
? 3 : 0;
807 /* By default, do no modification. */
808 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
815 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
820 /* Assuming that types whose size is > pointer-size are not guaranteed to be
821 naturally aligned. */
822 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
825 /* Assuming that types whose size is <= pointer-size
826 are naturally aligned. */
830 /* By default, assume that a target supports any factor of misalignment
831 memory access if it supports movmisalign patten.
832 is_packed is true if the memory access is defined in a packed struct. */
834 default_builtin_support_vector_misalignment (enum machine_mode mode
,
842 if (optab_handler (movmisalign_optab
, mode
)->insn_code
!= CODE_FOR_nothing
)
847 /* Determine whether or not a pointer mode is valid. Assume defaults
848 of ptr_mode or Pmode - can be overridden. */
850 default_valid_pointer_mode (enum machine_mode mode
)
852 return (mode
== ptr_mode
|| mode
== Pmode
);
855 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
856 for the generic address space only. */
859 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
861 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
865 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
866 for the generic address space only. */
869 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
871 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
875 /* Named address space version of valid_pointer_mode. */
878 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
880 if (!ADDR_SPACE_GENERIC_P (as
))
881 return (mode
== targetm
.addr_space
.pointer_mode (as
)
882 || mode
== targetm
.addr_space
.address_mode (as
));
884 return targetm
.valid_pointer_mode (mode
);
887 /* Some places still assume that all pointer or address modes are the
888 standard Pmode and ptr_mode. These optimizations become invalid if
889 the target actually supports multiple different modes. For now,
890 we disable such optimizations on such targets, using this function. */
893 target_default_pointer_address_modes_p (void)
895 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
897 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
903 /* Named address space version of legitimate_address_p. */
906 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
907 bool strict
, addr_space_t as
)
909 if (!ADDR_SPACE_GENERIC_P (as
))
912 return targetm
.legitimate_address_p (mode
, mem
, strict
);
915 /* Named address space version of LEGITIMIZE_ADDRESS. */
918 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
919 enum machine_mode mode
, addr_space_t as
)
921 if (!ADDR_SPACE_GENERIC_P (as
))
924 return targetm
.legitimize_address (x
, oldx
, mode
);
927 /* The default hook for determining if one named address space is a subset of
928 another and to return which address space to use as the common address
932 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
934 return (subset
== superset
);
937 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
938 called for targets with only a generic address space. */
941 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
942 tree from_type ATTRIBUTE_UNUSED
,
943 tree to_type ATTRIBUTE_UNUSED
)
949 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
955 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
956 tree
ARG_UNUSED (name
),
957 tree
ARG_UNUSED (args
),
958 int ARG_UNUSED (flags
))
960 warning (OPT_Wattributes
,
961 "target attribute is not supported on this machine");
967 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
968 tree
ARG_UNUSED (pop_target
))
970 warning (OPT_Wpragmas
,
971 "#pragma GCC target is not supported for this machine");
977 default_target_can_inline_p (tree caller
, tree callee
)
980 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
981 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
983 /* If callee has no option attributes, then it is ok to inline */
987 /* If caller has no option attributes, but callee does then it is not ok to
989 else if (!caller_opts
)
992 /* If both caller and callee have attributes, assume that if the pointer is
993 different, the the two functions have different target options since
994 build_target_option_node uses a hash table for the options. */
996 ret
= (callee_opts
== caller_opts
);
1002 # define HAVE_casesi 0
1005 /* If the machine does not have a case insn that compares the bounds,
1006 this means extra overhead for dispatch tables, which raises the
1007 threshold for using them. */
1009 unsigned int default_case_values_threshold (void)
1011 return (HAVE_casesi
? 4 : 5);
1015 default_have_conditional_execution (void)
1017 #ifdef HAVE_conditional_execution
1018 return HAVE_conditional_execution
;
1024 #include "gt-targhooks.h"