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 /* Emit to STREAM the assembler syntax for insn operand X. */
331 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
332 int code ATTRIBUTE_UNUSED
)
335 PRINT_OPERAND (stream
, x
, code
);
341 /* Emit to STREAM the assembler syntax for an insn operand whose memory
345 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
346 rtx x ATTRIBUTE_UNUSED
)
348 #ifdef PRINT_OPERAND_ADDRESS
349 PRINT_OPERAND_ADDRESS (stream
, x
);
355 /* Return true if CODE is a valid punctuation character for the
356 `print_operand' hook. */
359 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
361 #ifdef PRINT_OPERAND_PUNCT_VALID_P
362 return PRINT_OPERAND_PUNCT_VALID_P (code
);
368 /* True if MODE is valid for the target. By "valid", we mean able to
369 be manipulated in non-trivial ways. In particular, this means all
370 the arithmetic is supported.
372 By default we guess this means that any C type is supported. If
373 we can't map the mode back to a type that would be available in C,
374 then reject it. Special case, here, is the double-word arithmetic
375 supported by optabs.c. */
378 default_scalar_mode_supported_p (enum machine_mode mode
)
380 int precision
= GET_MODE_PRECISION (mode
);
382 switch (GET_MODE_CLASS (mode
))
384 case MODE_PARTIAL_INT
:
386 if (precision
== CHAR_TYPE_SIZE
)
388 if (precision
== SHORT_TYPE_SIZE
)
390 if (precision
== INT_TYPE_SIZE
)
392 if (precision
== LONG_TYPE_SIZE
)
394 if (precision
== LONG_LONG_TYPE_SIZE
)
396 if (precision
== 2 * BITS_PER_WORD
)
401 if (precision
== FLOAT_TYPE_SIZE
)
403 if (precision
== DOUBLE_TYPE_SIZE
)
405 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
409 case MODE_DECIMAL_FLOAT
:
421 /* True if the target supports decimal floating point. */
424 default_decimal_float_supported_p (void)
426 return ENABLE_DECIMAL_FLOAT
;
429 /* True if the target supports fixed-point arithmetic. */
432 default_fixed_point_supported_p (void)
434 return ENABLE_FIXED_POINT
;
437 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
440 This function checks whether a given INSN is valid within a low-overhead
441 loop. If INSN is invalid it returns the reason for that, otherwise it
442 returns NULL. A called function may clobber any special registers required
443 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
444 register for branch on table instructions. We reject the doloop pattern in
448 default_invalid_within_doloop (const_rtx insn
)
451 return "Function call in loop.";
453 if (JUMP_TABLE_DATA_P (insn
))
454 return "Computed branch in the loop.";
459 /* Mapping of builtin functions to vectorized variants. */
462 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
463 tree type_out ATTRIBUTE_UNUSED
,
464 tree type_in ATTRIBUTE_UNUSED
)
469 /* Vectorized conversion. */
472 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
473 tree dest_type ATTRIBUTE_UNUSED
,
474 tree src_type ATTRIBUTE_UNUSED
)
479 /* Default vectorizer cost model values. */
482 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
483 tree vectype ATTRIBUTE_UNUSED
,
484 int misalign ATTRIBUTE_UNUSED
)
486 switch (type_of_cost
)
496 case cond_branch_not_taken
:
501 case unaligned_store
:
504 case cond_branch_taken
:
515 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
516 bool md_fn ATTRIBUTE_UNUSED
,
517 bool sqrt ATTRIBUTE_UNUSED
)
523 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
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_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
533 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
534 enum machine_mode mode ATTRIBUTE_UNUSED
,
535 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
541 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
542 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
543 enum machine_mode mode ATTRIBUTE_UNUSED
,
544 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
550 default_function_arg_advance (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
551 enum machine_mode mode ATTRIBUTE_UNUSED
,
552 const_tree type ATTRIBUTE_UNUSED
,
553 bool named ATTRIBUTE_UNUSED
)
555 #ifdef FUNCTION_ARG_ADVANCE
556 CUMULATIVE_ARGS args
= *ca
;
557 FUNCTION_ARG_ADVANCE (args
, mode
, CONST_CAST_TREE (type
), named
);
565 default_function_arg (const CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
566 enum machine_mode mode ATTRIBUTE_UNUSED
,
567 const_tree type ATTRIBUTE_UNUSED
,
568 bool named ATTRIBUTE_UNUSED
)
571 return FUNCTION_ARG (*(CONST_CAST (CUMULATIVE_ARGS
*, ca
)), mode
,
572 CONST_CAST_TREE (type
), named
);
579 default_function_incoming_arg (const CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
580 enum machine_mode mode ATTRIBUTE_UNUSED
,
581 const_tree type ATTRIBUTE_UNUSED
,
582 bool named ATTRIBUTE_UNUSED
)
584 #ifdef FUNCTION_INCOMING_ARG
585 return FUNCTION_INCOMING_ARG (*(CONST_CAST (CUMULATIVE_ARGS
*, ca
)), mode
,
586 CONST_CAST_TREE (type
), named
);
593 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
598 hook_invalid_arg_for_unprototyped_fn (
599 const_tree typelist ATTRIBUTE_UNUSED
,
600 const_tree funcdecl ATTRIBUTE_UNUSED
,
601 const_tree val ATTRIBUTE_UNUSED
)
606 /* Initialize the stack protection decls. */
608 /* Stack protection related decls living in libgcc. */
609 static GTY(()) tree stack_chk_guard_decl
;
612 default_stack_protect_guard (void)
614 tree t
= stack_chk_guard_decl
;
620 t
= build_decl (UNKNOWN_LOCATION
,
621 VAR_DECL
, get_identifier ("__stack_chk_guard"),
625 DECL_EXTERNAL (t
) = 1;
627 TREE_THIS_VOLATILE (t
) = 1;
628 DECL_ARTIFICIAL (t
) = 1;
629 DECL_IGNORED_P (t
) = 1;
631 /* Do not share RTL as the declaration is visible outside of
634 RTX_FLAG (x
, used
) = 1;
636 stack_chk_guard_decl
= t
;
642 static GTY(()) tree stack_chk_fail_decl
;
645 default_external_stack_protect_fail (void)
647 tree t
= stack_chk_fail_decl
;
651 t
= build_function_type_list (void_type_node
, NULL_TREE
);
652 t
= build_decl (UNKNOWN_LOCATION
,
653 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
656 DECL_EXTERNAL (t
) = 1;
658 TREE_THIS_VOLATILE (t
) = 1;
659 TREE_NOTHROW (t
) = 1;
660 DECL_ARTIFICIAL (t
) = 1;
661 DECL_IGNORED_P (t
) = 1;
662 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
663 DECL_VISIBILITY_SPECIFIED (t
) = 1;
665 stack_chk_fail_decl
= t
;
668 return build_call_expr (t
, 0);
672 default_hidden_stack_protect_fail (void)
674 #ifndef HAVE_GAS_HIDDEN
675 return default_external_stack_protect_fail ();
677 tree t
= stack_chk_fail_decl
;
680 return default_external_stack_protect_fail ();
684 t
= build_function_type_list (void_type_node
, NULL_TREE
);
685 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
686 get_identifier ("__stack_chk_fail_local"), t
);
689 DECL_EXTERNAL (t
) = 1;
691 TREE_THIS_VOLATILE (t
) = 1;
692 TREE_NOTHROW (t
) = 1;
693 DECL_ARTIFICIAL (t
) = 1;
694 DECL_IGNORED_P (t
) = 1;
695 DECL_VISIBILITY_SPECIFIED (t
) = 1;
696 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
698 stack_chk_fail_decl
= t
;
701 return build_call_expr (t
, 0);
706 hook_bool_const_rtx_commutative_p (const_rtx x
,
707 int outer_code ATTRIBUTE_UNUSED
)
709 return COMMUTATIVE_P (x
);
713 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
714 const_tree fn_decl_or_type
,
715 bool outgoing ATTRIBUTE_UNUSED
)
717 /* The old interface doesn't handle receiving the function type. */
719 && !DECL_P (fn_decl_or_type
))
720 fn_decl_or_type
= NULL
;
722 #ifdef FUNCTION_VALUE
723 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
730 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED
,
731 const_rtx fun ATTRIBUTE_UNUSED
)
734 return LIBCALL_VALUE (mode
);
740 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
743 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
745 #ifdef FUNCTION_VALUE_REGNO_P
746 return FUNCTION_VALUE_REGNO_P (regno
);
753 default_internal_arg_pointer (void)
755 /* If the reg that the virtual arg pointer will be translated into is
756 not a fixed reg or is the stack pointer, make a copy of the virtual
757 arg pointer, and address parms via the copy. The frame pointer is
758 considered fixed even though it is not marked as such. */
759 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
760 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
761 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
762 return copy_to_reg (virtual_incoming_args_rtx
);
764 return virtual_incoming_args_rtx
;
768 default_static_chain (const_tree fndecl
, bool incoming_p
)
770 if (!DECL_STATIC_CHAIN (fndecl
))
775 #ifdef STATIC_CHAIN_INCOMING_REGNUM
776 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
780 #ifdef STATIC_CHAIN_REGNUM
781 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
785 static bool issued_error
;
789 sorry ("nested functions not supported on this target");
792 /* It really doesn't matter what we return here, so long at it
793 doesn't cause the rest of the compiler to crash. */
794 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
799 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
800 rtx
ARG_UNUSED (r_chain
))
802 sorry ("nested function trampolines not supported on this target");
806 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
807 tree funtype ATTRIBUTE_UNUSED
,
808 int size ATTRIBUTE_UNUSED
)
814 default_branch_target_register_class (void)
819 #ifdef IRA_COVER_CLASSES
821 default_ira_cover_classes (void)
823 static reg_class_t classes
[] = IRA_COVER_CLASSES
;
829 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
830 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
831 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
832 secondary_reload_info
*sri
)
834 enum reg_class rclass
= NO_REGS
;
835 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
837 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
839 sri
->icode
= sri
->prev_sri
->t_icode
;
842 #ifdef SECONDARY_INPUT_RELOAD_CLASS
844 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
846 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
848 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
850 if (rclass
!= NO_REGS
)
853 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
856 if (icode
!= CODE_FOR_nothing
857 && insn_data
[(int) icode
].operand
[in_p
].predicate
858 && ! insn_data
[(int) icode
].operand
[in_p
].predicate (x
, reload_mode
))
859 icode
= CODE_FOR_nothing
;
860 else if (icode
!= CODE_FOR_nothing
)
862 const char *insn_constraint
, *scratch_constraint
;
863 char insn_letter
, scratch_letter
;
864 enum reg_class insn_class
, scratch_class
;
866 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
867 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
868 if (!*insn_constraint
)
869 insn_class
= ALL_REGS
;
874 gcc_assert (*insn_constraint
== '=');
877 insn_letter
= *insn_constraint
;
879 = (insn_letter
== 'r' ? GENERAL_REGS
880 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
882 gcc_assert (insn_class
!= NO_REGS
);
885 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
886 /* The scratch register's constraint must start with "=&",
887 except for an input reload, where only "=" is necessary,
888 and where it might be beneficial to re-use registers from
890 gcc_assert (scratch_constraint
[0] == '='
891 && (in_p
|| scratch_constraint
[1] == '&'));
892 scratch_constraint
++;
893 if (*scratch_constraint
== '&')
894 scratch_constraint
++;
895 scratch_letter
= *scratch_constraint
;
897 = (scratch_letter
== 'r' ? GENERAL_REGS
898 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
899 scratch_constraint
));
901 if (reg_class_subset_p (reload_class
, insn_class
))
903 gcc_assert (scratch_class
== rclass
);
910 if (rclass
== NO_REGS
)
913 sri
->t_icode
= icode
;
919 default_target_option_override (void)
921 #ifdef OVERRIDE_OPTIONS
927 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
928 const char *arg ATTRIBUTE_UNUSED
,
929 int value ATTRIBUTE_UNUSED
)
934 /* By default, if flag_pic is true, then neither local nor global relocs
935 should be placed in readonly memory. */
938 default_reloc_rw_mask (void)
940 return flag_pic
? 3 : 0;
943 /* By default, do no modification. */
944 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
951 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
956 /* Assuming that types whose size is > pointer-size are not guaranteed to be
957 naturally aligned. */
958 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
961 /* Assuming that types whose size is <= pointer-size
962 are naturally aligned. */
966 /* By default, assume that a target supports any factor of misalignment
967 memory access if it supports movmisalign patten.
968 is_packed is true if the memory access is defined in a packed struct. */
970 default_builtin_support_vector_misalignment (enum machine_mode mode
,
978 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
983 /* Determine whether or not a pointer mode is valid. Assume defaults
984 of ptr_mode or Pmode - can be overridden. */
986 default_valid_pointer_mode (enum machine_mode mode
)
988 return (mode
== ptr_mode
|| mode
== Pmode
);
991 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
992 for the generic address space only. */
995 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
997 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1001 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1002 for the generic address space only. */
1005 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1007 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1011 /* Named address space version of valid_pointer_mode. */
1014 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
1016 if (!ADDR_SPACE_GENERIC_P (as
))
1017 return (mode
== targetm
.addr_space
.pointer_mode (as
)
1018 || mode
== targetm
.addr_space
.address_mode (as
));
1020 return targetm
.valid_pointer_mode (mode
);
1023 /* Some places still assume that all pointer or address modes are the
1024 standard Pmode and ptr_mode. These optimizations become invalid if
1025 the target actually supports multiple different modes. For now,
1026 we disable such optimizations on such targets, using this function. */
1029 target_default_pointer_address_modes_p (void)
1031 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1033 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1039 /* Named address space version of legitimate_address_p. */
1042 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
1043 bool strict
, addr_space_t as
)
1045 if (!ADDR_SPACE_GENERIC_P (as
))
1048 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1051 /* Named address space version of LEGITIMIZE_ADDRESS. */
1054 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
1055 enum machine_mode mode
, addr_space_t as
)
1057 if (!ADDR_SPACE_GENERIC_P (as
))
1060 return targetm
.legitimize_address (x
, oldx
, mode
);
1063 /* The default hook for determining if one named address space is a subset of
1064 another and to return which address space to use as the common address
1068 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1070 return (subset
== superset
);
1073 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1074 called for targets with only a generic address space. */
1077 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1078 tree from_type ATTRIBUTE_UNUSED
,
1079 tree to_type ATTRIBUTE_UNUSED
)
1085 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1090 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1093 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
)
1095 #ifdef GO_IF_MODE_DEPENDENT_ADDRESS
1097 GO_IF_MODE_DEPENDENT_ADDRESS (CONST_CAST_RTX (addr
), win
);
1099 /* Label `win' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */
1100 win
: ATTRIBUTE_UNUSED_LABEL
1111 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1112 tree
ARG_UNUSED (name
),
1113 tree
ARG_UNUSED (args
),
1114 int ARG_UNUSED (flags
))
1116 warning (OPT_Wattributes
,
1117 "target attribute is not supported on this machine");
1123 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1124 tree
ARG_UNUSED (pop_target
))
1126 warning (OPT_Wpragmas
,
1127 "#pragma GCC target is not supported for this machine");
1133 default_target_can_inline_p (tree caller
, tree callee
)
1136 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1137 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1139 /* If callee has no option attributes, then it is ok to inline */
1143 /* If caller has no option attributes, but callee does then it is not ok to
1145 else if (!caller_opts
)
1148 /* If both caller and callee have attributes, assume that if the pointer is
1149 different, the the two functions have different target options since
1150 build_target_option_node uses a hash table for the options. */
1152 ret
= (callee_opts
== caller_opts
);
1158 # define HAVE_casesi 0
1161 /* If the machine does not have a case insn that compares the bounds,
1162 this means extra overhead for dispatch tables, which raises the
1163 threshold for using them. */
1165 unsigned int default_case_values_threshold (void)
1167 return (HAVE_casesi
? 4 : 5);
1171 default_have_conditional_execution (void)
1173 #ifdef HAVE_conditional_execution
1174 return HAVE_conditional_execution
;
1180 /* Compute cost of moving registers to/from memory. */
1183 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1184 reg_class_t rclass ATTRIBUTE_UNUSED
,
1185 bool in ATTRIBUTE_UNUSED
)
1187 #ifndef MEMORY_MOVE_COST
1188 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1190 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1194 /* Compute cost of moving data from a register of class FROM to one of
1198 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1199 reg_class_t from ATTRIBUTE_UNUSED
,
1200 reg_class_t to ATTRIBUTE_UNUSED
)
1202 #ifndef REGISTER_MOVE_COST
1205 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1209 #include "gt-targhooks.h"