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"
59 #include "diagnostic-core.h"
64 #include "target-def.h"
66 #include "hard-reg-set.h"
73 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED
,
74 rtx addr ATTRIBUTE_UNUSED
,
75 bool strict ATTRIBUTE_UNUSED
)
77 #ifdef GO_IF_LEGITIMATE_ADDRESS
78 /* Defer to the old implementation using a goto. */
80 return strict_memory_address_p (mode
, addr
);
82 return memory_address_p (mode
, addr
);
89 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
91 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
92 ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file
, fun
);
97 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
101 if (GET_CODE (x
) == UNSPEC_VOLATILE
102 /* Any floating arithmetic may trap. */
103 || (SCALAR_FLOAT_MODE_P (GET_MODE (x
))
104 && flag_trapping_math
))
107 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
109 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
117 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
118 enum machine_mode mode
,
119 int *punsignedp ATTRIBUTE_UNUSED
,
120 const_tree funtype ATTRIBUTE_UNUSED
,
121 int for_return ATTRIBUTE_UNUSED
)
124 return promote_mode (type
, mode
, punsignedp
);
129 default_promote_function_mode_always_promote (const_tree type
,
130 enum machine_mode mode
,
132 const_tree funtype ATTRIBUTE_UNUSED
,
133 int for_return ATTRIBUTE_UNUSED
)
135 return promote_mode (type
, mode
, punsignedp
);
140 default_cc_modes_compatible (enum machine_mode m1
, enum machine_mode m2
)
148 default_return_in_memory (const_tree type
,
149 const_tree fntype ATTRIBUTE_UNUSED
)
151 return (TYPE_MODE (type
) == BLKmode
);
155 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
156 enum machine_mode mode ATTRIBUTE_UNUSED
)
162 default_expand_builtin_saveregs (void)
164 error ("__builtin_saveregs not supported by this target");
169 default_setup_incoming_varargs (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
170 enum machine_mode mode ATTRIBUTE_UNUSED
,
171 tree type ATTRIBUTE_UNUSED
,
172 int *pretend_arg_size ATTRIBUTE_UNUSED
,
173 int second_time ATTRIBUTE_UNUSED
)
177 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
180 default_builtin_setjmp_frame_value (void)
182 return virtual_stack_vars_rtx
;
185 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
188 hook_bool_CUMULATIVE_ARGS_false (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
)
194 default_pretend_outgoing_varargs_named (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
)
196 return (targetm
.calls
.setup_incoming_varargs
197 != default_setup_incoming_varargs
);
201 default_eh_return_filter_mode (void)
203 return targetm
.unwind_word_mode ();
207 default_libgcc_cmp_return_mode (void)
213 default_libgcc_shift_count_mode (void)
219 default_unwind_word_mode (void)
224 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
226 unsigned HOST_WIDE_INT
227 default_shift_truncation_mask (enum machine_mode mode
)
229 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
232 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
235 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED
)
237 return have_insn_for (DIV
, mode
) ? 3 : 2;
240 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
243 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED
,
244 enum machine_mode mode_rep ATTRIBUTE_UNUSED
)
249 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
252 hook_bool_CUMULATIVE_ARGS_true (CUMULATIVE_ARGS
* a ATTRIBUTE_UNUSED
)
257 /* Return machine mode for non-standard suffix
258 or VOIDmode if non-standard suffixes are unsupported. */
260 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
265 /* The generic C++ ABI specifies this is a 64-bit value. */
267 default_cxx_guard_type (void)
269 return long_long_integer_type_node
;
273 /* Returns the size of the cookie to use when allocating an array
274 whose elements have the indicated TYPE. Assumes that it is already
275 known that a cookie is needed. */
278 default_cxx_get_cookie_size (tree type
)
282 /* We need to allocate an additional max (sizeof (size_t), alignof
283 (true_type)) bytes. */
287 sizetype_size
= size_in_bytes (sizetype
);
288 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
289 if (INT_CST_LT_UNSIGNED (type_align
, sizetype_size
))
290 cookie_size
= sizetype_size
;
292 cookie_size
= type_align
;
297 /* Return true if a parameter must be passed by reference. This version
298 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
301 hook_pass_by_reference_must_pass_in_stack (CUMULATIVE_ARGS
*c ATTRIBUTE_UNUSED
,
302 enum machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
303 bool named_arg ATTRIBUTE_UNUSED
)
305 return targetm
.calls
.must_pass_in_stack (mode
, type
);
308 /* Return true if a parameter follows callee copies conventions. This
309 version of the hook is true for all named arguments. */
312 hook_callee_copies_named (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
313 enum machine_mode mode ATTRIBUTE_UNUSED
,
314 const_tree type ATTRIBUTE_UNUSED
, bool named
)
319 /* Emit to STREAM the assembler syntax for insn operand X. */
322 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
323 int code ATTRIBUTE_UNUSED
)
326 PRINT_OPERAND (stream
, x
, code
);
332 /* Emit to STREAM the assembler syntax for an insn operand whose memory
336 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
337 rtx x ATTRIBUTE_UNUSED
)
339 #ifdef PRINT_OPERAND_ADDRESS
340 PRINT_OPERAND_ADDRESS (stream
, x
);
346 /* Return true if CODE is a valid punctuation character for the
347 `print_operand' hook. */
350 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
352 #ifdef PRINT_OPERAND_PUNCT_VALID_P
353 return PRINT_OPERAND_PUNCT_VALID_P (code
);
359 /* True if MODE is valid for the target. By "valid", we mean able to
360 be manipulated in non-trivial ways. In particular, this means all
361 the arithmetic is supported.
363 By default we guess this means that any C type is supported. If
364 we can't map the mode back to a type that would be available in C,
365 then reject it. Special case, here, is the double-word arithmetic
366 supported by optabs.c. */
369 default_scalar_mode_supported_p (enum machine_mode mode
)
371 int precision
= GET_MODE_PRECISION (mode
);
373 switch (GET_MODE_CLASS (mode
))
375 case MODE_PARTIAL_INT
:
377 if (precision
== CHAR_TYPE_SIZE
)
379 if (precision
== SHORT_TYPE_SIZE
)
381 if (precision
== INT_TYPE_SIZE
)
383 if (precision
== LONG_TYPE_SIZE
)
385 if (precision
== LONG_LONG_TYPE_SIZE
)
387 if (precision
== 2 * BITS_PER_WORD
)
392 if (precision
== FLOAT_TYPE_SIZE
)
394 if (precision
== DOUBLE_TYPE_SIZE
)
396 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
400 case MODE_DECIMAL_FLOAT
:
412 /* True if the target supports decimal floating point. */
415 default_decimal_float_supported_p (void)
417 return ENABLE_DECIMAL_FLOAT
;
420 /* True if the target supports fixed-point arithmetic. */
423 default_fixed_point_supported_p (void)
425 return ENABLE_FIXED_POINT
;
428 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
431 This function checks whether a given INSN is valid within a low-overhead
432 loop. If INSN is invalid it returns the reason for that, otherwise it
433 returns NULL. A called function may clobber any special registers required
434 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
435 register for branch on table instructions. We reject the doloop pattern in
439 default_invalid_within_doloop (const_rtx insn
)
442 return "Function call in loop.";
444 if (JUMP_TABLE_DATA_P (insn
))
445 return "Computed branch in the loop.";
450 /* Mapping of builtin functions to vectorized variants. */
453 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
454 tree type_out ATTRIBUTE_UNUSED
,
455 tree type_in ATTRIBUTE_UNUSED
)
460 /* Vectorized conversion. */
463 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
464 tree dest_type ATTRIBUTE_UNUSED
,
465 tree src_type ATTRIBUTE_UNUSED
)
470 /* Default vectorizer cost model values. */
473 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
474 tree vectype ATTRIBUTE_UNUSED
,
475 int misalign ATTRIBUTE_UNUSED
)
477 switch (type_of_cost
)
487 case cond_branch_not_taken
:
492 case unaligned_store
:
495 case cond_branch_taken
:
506 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
507 bool md_fn ATTRIBUTE_UNUSED
,
508 bool sqrt ATTRIBUTE_UNUSED
)
514 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
515 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
516 enum machine_mode mode ATTRIBUTE_UNUSED
,
517 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
523 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
524 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
525 enum machine_mode mode ATTRIBUTE_UNUSED
,
526 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
532 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
533 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
534 enum machine_mode mode ATTRIBUTE_UNUSED
,
535 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
541 default_function_arg_advance (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
542 enum machine_mode mode ATTRIBUTE_UNUSED
,
543 const_tree type ATTRIBUTE_UNUSED
,
544 bool named ATTRIBUTE_UNUSED
)
546 #ifdef FUNCTION_ARG_ADVANCE
547 CUMULATIVE_ARGS args
= *ca
;
548 FUNCTION_ARG_ADVANCE (args
, mode
, CONST_CAST_TREE (type
), named
);
556 default_function_arg (const CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
557 enum machine_mode mode ATTRIBUTE_UNUSED
,
558 const_tree type ATTRIBUTE_UNUSED
,
559 bool named ATTRIBUTE_UNUSED
)
562 return FUNCTION_ARG (*(CONST_CAST (CUMULATIVE_ARGS
*, ca
)), mode
,
563 CONST_CAST_TREE (type
), named
);
570 default_function_incoming_arg (const CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
571 enum machine_mode mode ATTRIBUTE_UNUSED
,
572 const_tree type ATTRIBUTE_UNUSED
,
573 bool named ATTRIBUTE_UNUSED
)
575 #ifdef FUNCTION_INCOMING_ARG
576 return FUNCTION_INCOMING_ARG (*(CONST_CAST (CUMULATIVE_ARGS
*, ca
)), mode
,
577 CONST_CAST_TREE (type
), named
);
584 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
589 hook_invalid_arg_for_unprototyped_fn (
590 const_tree typelist ATTRIBUTE_UNUSED
,
591 const_tree funcdecl ATTRIBUTE_UNUSED
,
592 const_tree val ATTRIBUTE_UNUSED
)
597 /* Initialize the stack protection decls. */
599 /* Stack protection related decls living in libgcc. */
600 static GTY(()) tree stack_chk_guard_decl
;
603 default_stack_protect_guard (void)
605 tree t
= stack_chk_guard_decl
;
611 t
= build_decl (UNKNOWN_LOCATION
,
612 VAR_DECL
, get_identifier ("__stack_chk_guard"),
616 DECL_EXTERNAL (t
) = 1;
618 TREE_THIS_VOLATILE (t
) = 1;
619 DECL_ARTIFICIAL (t
) = 1;
620 DECL_IGNORED_P (t
) = 1;
622 /* Do not share RTL as the declaration is visible outside of
625 RTX_FLAG (x
, used
) = 1;
627 stack_chk_guard_decl
= t
;
633 static GTY(()) tree stack_chk_fail_decl
;
636 default_external_stack_protect_fail (void)
638 tree t
= stack_chk_fail_decl
;
642 t
= build_function_type_list (void_type_node
, NULL_TREE
);
643 t
= build_decl (UNKNOWN_LOCATION
,
644 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
647 DECL_EXTERNAL (t
) = 1;
649 TREE_THIS_VOLATILE (t
) = 1;
650 TREE_NOTHROW (t
) = 1;
651 DECL_ARTIFICIAL (t
) = 1;
652 DECL_IGNORED_P (t
) = 1;
653 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
654 DECL_VISIBILITY_SPECIFIED (t
) = 1;
656 stack_chk_fail_decl
= t
;
659 return build_call_expr (t
, 0);
663 default_hidden_stack_protect_fail (void)
665 #ifndef HAVE_GAS_HIDDEN
666 return default_external_stack_protect_fail ();
668 tree t
= stack_chk_fail_decl
;
671 return default_external_stack_protect_fail ();
675 t
= build_function_type_list (void_type_node
, NULL_TREE
);
676 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
677 get_identifier ("__stack_chk_fail_local"), t
);
680 DECL_EXTERNAL (t
) = 1;
682 TREE_THIS_VOLATILE (t
) = 1;
683 TREE_NOTHROW (t
) = 1;
684 DECL_ARTIFICIAL (t
) = 1;
685 DECL_IGNORED_P (t
) = 1;
686 DECL_VISIBILITY_SPECIFIED (t
) = 1;
687 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
689 stack_chk_fail_decl
= t
;
692 return build_call_expr (t
, 0);
697 hook_bool_const_rtx_commutative_p (const_rtx x
,
698 int outer_code ATTRIBUTE_UNUSED
)
700 return COMMUTATIVE_P (x
);
704 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
705 const_tree fn_decl_or_type
,
706 bool outgoing ATTRIBUTE_UNUSED
)
708 /* The old interface doesn't handle receiving the function type. */
710 && !DECL_P (fn_decl_or_type
))
711 fn_decl_or_type
= NULL
;
713 #ifdef FUNCTION_VALUE
714 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
721 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED
,
722 const_rtx fun ATTRIBUTE_UNUSED
)
725 return LIBCALL_VALUE (mode
);
731 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
734 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
736 #ifdef FUNCTION_VALUE_REGNO_P
737 return FUNCTION_VALUE_REGNO_P (regno
);
744 default_internal_arg_pointer (void)
746 /* If the reg that the virtual arg pointer will be translated into is
747 not a fixed reg or is the stack pointer, make a copy of the virtual
748 arg pointer, and address parms via the copy. The frame pointer is
749 considered fixed even though it is not marked as such. */
750 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
751 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
752 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
753 return copy_to_reg (virtual_incoming_args_rtx
);
755 return virtual_incoming_args_rtx
;
759 default_static_chain (const_tree fndecl
, bool incoming_p
)
761 if (!DECL_STATIC_CHAIN (fndecl
))
766 #ifdef STATIC_CHAIN_INCOMING_REGNUM
767 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
771 #ifdef STATIC_CHAIN_REGNUM
772 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
776 static bool issued_error
;
780 sorry ("nested functions not supported on this target");
783 /* It really doesn't matter what we return here, so long at it
784 doesn't cause the rest of the compiler to crash. */
785 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
790 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
791 rtx
ARG_UNUSED (r_chain
))
793 sorry ("nested function trampolines not supported on this target");
797 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
798 tree funtype ATTRIBUTE_UNUSED
,
799 int size ATTRIBUTE_UNUSED
)
805 default_branch_target_register_class (void)
810 #ifdef IRA_COVER_CLASSES
812 default_ira_cover_classes (void)
814 static reg_class_t classes
[] = IRA_COVER_CLASSES
;
820 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
821 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
822 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
823 secondary_reload_info
*sri
)
825 enum reg_class rclass
= NO_REGS
;
826 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
828 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
830 sri
->icode
= sri
->prev_sri
->t_icode
;
833 #ifdef SECONDARY_INPUT_RELOAD_CLASS
835 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
837 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
839 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
841 if (rclass
!= NO_REGS
)
844 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
847 if (icode
!= CODE_FOR_nothing
848 && insn_data
[(int) icode
].operand
[in_p
].predicate
849 && ! insn_data
[(int) icode
].operand
[in_p
].predicate (x
, reload_mode
))
850 icode
= CODE_FOR_nothing
;
851 else if (icode
!= CODE_FOR_nothing
)
853 const char *insn_constraint
, *scratch_constraint
;
854 char insn_letter
, scratch_letter
;
855 enum reg_class insn_class
, scratch_class
;
857 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
858 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
859 if (!*insn_constraint
)
860 insn_class
= ALL_REGS
;
865 gcc_assert (*insn_constraint
== '=');
868 insn_letter
= *insn_constraint
;
870 = (insn_letter
== 'r' ? GENERAL_REGS
871 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
873 gcc_assert (insn_class
!= NO_REGS
);
876 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
877 /* The scratch register's constraint must start with "=&",
878 except for an input reload, where only "=" is necessary,
879 and where it might be beneficial to re-use registers from
881 gcc_assert (scratch_constraint
[0] == '='
882 && (in_p
|| scratch_constraint
[1] == '&'));
883 scratch_constraint
++;
884 if (*scratch_constraint
== '&')
885 scratch_constraint
++;
886 scratch_letter
= *scratch_constraint
;
888 = (scratch_letter
== 'r' ? GENERAL_REGS
889 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
890 scratch_constraint
));
892 if (reg_class_subset_p (reload_class
, insn_class
))
894 gcc_assert (scratch_class
== rclass
);
901 if (rclass
== NO_REGS
)
904 sri
->t_icode
= icode
;
910 default_target_option_override (void)
912 #ifdef OVERRIDE_OPTIONS
918 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
919 const char *arg ATTRIBUTE_UNUSED
,
920 int value ATTRIBUTE_UNUSED
)
925 /* By default, if flag_pic is true, then neither local nor global relocs
926 should be placed in readonly memory. */
929 default_reloc_rw_mask (void)
931 return flag_pic
? 3 : 0;
934 /* By default, do no modification. */
935 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
942 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
947 /* Assuming that types whose size is > pointer-size are not guaranteed to be
948 naturally aligned. */
949 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
952 /* Assuming that types whose size is <= pointer-size
953 are naturally aligned. */
957 /* By default, assume that a target supports any factor of misalignment
958 memory access if it supports movmisalign patten.
959 is_packed is true if the memory access is defined in a packed struct. */
961 default_builtin_support_vector_misalignment (enum machine_mode mode
,
969 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
974 /* Determine whether or not a pointer mode is valid. Assume defaults
975 of ptr_mode or Pmode - can be overridden. */
977 default_valid_pointer_mode (enum machine_mode mode
)
979 return (mode
== ptr_mode
|| mode
== Pmode
);
982 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
983 for the generic address space only. */
986 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
988 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
992 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
993 for the generic address space only. */
996 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
998 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1002 /* Named address space version of valid_pointer_mode. */
1005 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
1007 if (!ADDR_SPACE_GENERIC_P (as
))
1008 return (mode
== targetm
.addr_space
.pointer_mode (as
)
1009 || mode
== targetm
.addr_space
.address_mode (as
));
1011 return targetm
.valid_pointer_mode (mode
);
1014 /* Some places still assume that all pointer or address modes are the
1015 standard Pmode and ptr_mode. These optimizations become invalid if
1016 the target actually supports multiple different modes. For now,
1017 we disable such optimizations on such targets, using this function. */
1020 target_default_pointer_address_modes_p (void)
1022 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1024 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1030 /* Named address space version of legitimate_address_p. */
1033 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
1034 bool strict
, addr_space_t as
)
1036 if (!ADDR_SPACE_GENERIC_P (as
))
1039 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1042 /* Named address space version of LEGITIMIZE_ADDRESS. */
1045 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
1046 enum machine_mode mode
, addr_space_t as
)
1048 if (!ADDR_SPACE_GENERIC_P (as
))
1051 return targetm
.legitimize_address (x
, oldx
, mode
);
1054 /* The default hook for determining if one named address space is a subset of
1055 another and to return which address space to use as the common address
1059 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1061 return (subset
== superset
);
1064 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1065 called for targets with only a generic address space. */
1068 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1069 tree from_type ATTRIBUTE_UNUSED
,
1070 tree to_type ATTRIBUTE_UNUSED
)
1076 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1081 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1084 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
)
1086 #ifdef GO_IF_MODE_DEPENDENT_ADDRESS
1088 GO_IF_MODE_DEPENDENT_ADDRESS (CONST_CAST_RTX (addr
), win
);
1090 /* Label `win' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */
1091 win
: ATTRIBUTE_UNUSED_LABEL
1102 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1103 tree
ARG_UNUSED (name
),
1104 tree
ARG_UNUSED (args
),
1105 int ARG_UNUSED (flags
))
1107 warning (OPT_Wattributes
,
1108 "target attribute is not supported on this machine");
1114 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1115 tree
ARG_UNUSED (pop_target
))
1117 warning (OPT_Wpragmas
,
1118 "#pragma GCC target is not supported for this machine");
1124 default_target_can_inline_p (tree caller
, tree callee
)
1127 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1128 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1130 /* If callee has no option attributes, then it is ok to inline */
1134 /* If caller has no option attributes, but callee does then it is not ok to
1136 else if (!caller_opts
)
1139 /* If both caller and callee have attributes, assume that if the pointer is
1140 different, the the two functions have different target options since
1141 build_target_option_node uses a hash table for the options. */
1143 ret
= (callee_opts
== caller_opts
);
1149 # define HAVE_casesi 0
1152 /* If the machine does not have a case insn that compares the bounds,
1153 this means extra overhead for dispatch tables, which raises the
1154 threshold for using them. */
1156 unsigned int default_case_values_threshold (void)
1158 return (HAVE_casesi
? 4 : 5);
1162 default_have_conditional_execution (void)
1164 #ifdef HAVE_conditional_execution
1165 return HAVE_conditional_execution
;
1171 /* Compute cost of moving registers to/from memory. */
1174 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1175 reg_class_t rclass ATTRIBUTE_UNUSED
,
1176 bool in ATTRIBUTE_UNUSED
)
1178 #ifndef MEMORY_MOVE_COST
1179 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1181 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1185 /* Compute cost of moving data from a register of class FROM to one of
1189 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1190 reg_class_t from ATTRIBUTE_UNUSED
,
1191 reg_class_t to ATTRIBUTE_UNUSED
)
1193 #ifndef REGISTER_MOVE_COST
1196 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1201 default_profile_before_prologue (void)
1203 #ifdef PROFILE_BEFORE_PROLOGUE
1210 #include "gt-targhooks.h"