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"
63 #include "target-def.h"
65 #include "hard-reg-set.h"
75 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED
,
76 rtx addr ATTRIBUTE_UNUSED
,
77 bool strict ATTRIBUTE_UNUSED
)
79 #ifdef GO_IF_LEGITIMATE_ADDRESS
80 /* Defer to the old implementation using a goto. */
82 return strict_memory_address_p (mode
, addr
);
84 return memory_address_p (mode
, addr
);
91 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
93 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
94 ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file
, fun
);
99 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
103 if (GET_CODE (x
) == UNSPEC_VOLATILE
104 /* Any floating arithmetic may trap. */
105 || (SCALAR_FLOAT_MODE_P (GET_MODE (x
))
106 && flag_trapping_math
))
109 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
111 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
119 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
120 enum machine_mode mode
,
121 int *punsignedp ATTRIBUTE_UNUSED
,
122 const_tree funtype ATTRIBUTE_UNUSED
,
123 int for_return ATTRIBUTE_UNUSED
)
126 return promote_mode (type
, mode
, punsignedp
);
131 default_promote_function_mode_always_promote (const_tree type
,
132 enum machine_mode mode
,
134 const_tree funtype ATTRIBUTE_UNUSED
,
135 int for_return ATTRIBUTE_UNUSED
)
137 return promote_mode (type
, mode
, punsignedp
);
142 default_cc_modes_compatible (enum machine_mode m1
, enum machine_mode m2
)
150 default_return_in_memory (const_tree type
,
151 const_tree fntype ATTRIBUTE_UNUSED
)
153 return (TYPE_MODE (type
) == BLKmode
);
157 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
158 enum machine_mode mode ATTRIBUTE_UNUSED
)
164 default_expand_builtin_saveregs (void)
166 error ("__builtin_saveregs not supported by this target");
171 default_setup_incoming_varargs (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
172 enum machine_mode mode ATTRIBUTE_UNUSED
,
173 tree type ATTRIBUTE_UNUSED
,
174 int *pretend_arg_size ATTRIBUTE_UNUSED
,
175 int second_time ATTRIBUTE_UNUSED
)
179 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
182 default_builtin_setjmp_frame_value (void)
184 return virtual_stack_vars_rtx
;
187 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
190 hook_bool_CUMULATIVE_ARGS_false (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
)
196 default_pretend_outgoing_varargs_named (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
)
198 return (targetm
.calls
.setup_incoming_varargs
199 != default_setup_incoming_varargs
);
203 default_eh_return_filter_mode (void)
205 return targetm
.unwind_word_mode ();
209 default_libgcc_cmp_return_mode (void)
215 default_libgcc_shift_count_mode (void)
221 default_unwind_word_mode (void)
226 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
228 unsigned HOST_WIDE_INT
229 default_shift_truncation_mask (enum machine_mode mode
)
231 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
234 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
237 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED
)
239 return have_insn_for (DIV
, mode
) ? 3 : 2;
242 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
245 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED
,
246 enum machine_mode mode_rep ATTRIBUTE_UNUSED
)
251 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
254 hook_bool_CUMULATIVE_ARGS_true (CUMULATIVE_ARGS
* a ATTRIBUTE_UNUSED
)
259 /* Return machine mode for non-standard suffix
260 or VOIDmode if non-standard suffixes are unsupported. */
262 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
267 /* The generic C++ ABI specifies this is a 64-bit value. */
269 default_cxx_guard_type (void)
271 return long_long_integer_type_node
;
275 /* Returns the size of the cookie to use when allocating an array
276 whose elements have the indicated TYPE. Assumes that it is already
277 known that a cookie is needed. */
280 default_cxx_get_cookie_size (tree type
)
284 /* We need to allocate an additional max (sizeof (size_t), alignof
285 (true_type)) bytes. */
289 sizetype_size
= size_in_bytes (sizetype
);
290 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
291 if (INT_CST_LT_UNSIGNED (type_align
, sizetype_size
))
292 cookie_size
= sizetype_size
;
294 cookie_size
= type_align
;
299 /* Return true if a parameter must be passed by reference. This version
300 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
303 hook_pass_by_reference_must_pass_in_stack (CUMULATIVE_ARGS
*c ATTRIBUTE_UNUSED
,
304 enum machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
305 bool named_arg ATTRIBUTE_UNUSED
)
307 return targetm
.calls
.must_pass_in_stack (mode
, type
);
310 /* Return true if a parameter follows callee copies conventions. This
311 version of the hook is true for all named arguments. */
314 hook_callee_copies_named (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
315 enum machine_mode mode ATTRIBUTE_UNUSED
,
316 const_tree type ATTRIBUTE_UNUSED
, bool named
)
321 /* Emit to STREAM the assembler syntax for insn operand X. */
324 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
325 int code ATTRIBUTE_UNUSED
)
328 PRINT_OPERAND (stream
, x
, code
);
334 /* Emit to STREAM the assembler syntax for an insn operand whose memory
338 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
339 rtx x ATTRIBUTE_UNUSED
)
341 #ifdef PRINT_OPERAND_ADDRESS
342 PRINT_OPERAND_ADDRESS (stream
, x
);
348 /* Return true if CODE is a valid punctuation character for the
349 `print_operand' hook. */
352 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
354 #ifdef PRINT_OPERAND_PUNCT_VALID_P
355 return PRINT_OPERAND_PUNCT_VALID_P (code
);
361 /* The default implementation of TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA. */
364 default_asm_output_addr_const_extra (FILE *file ATTRIBUTE_UNUSED
,
365 rtx x ATTRIBUTE_UNUSED
)
367 #ifdef OUTPUT_ADDR_CONST_EXTRA
368 OUTPUT_ADDR_CONST_EXTRA (file
, x
, fail
);
376 /* True if MODE is valid for the target. By "valid", we mean able to
377 be manipulated in non-trivial ways. In particular, this means all
378 the arithmetic is supported.
380 By default we guess this means that any C type is supported. If
381 we can't map the mode back to a type that would be available in C,
382 then reject it. Special case, here, is the double-word arithmetic
383 supported by optabs.c. */
386 default_scalar_mode_supported_p (enum machine_mode mode
)
388 int precision
= GET_MODE_PRECISION (mode
);
390 switch (GET_MODE_CLASS (mode
))
392 case MODE_PARTIAL_INT
:
394 if (precision
== CHAR_TYPE_SIZE
)
396 if (precision
== SHORT_TYPE_SIZE
)
398 if (precision
== INT_TYPE_SIZE
)
400 if (precision
== LONG_TYPE_SIZE
)
402 if (precision
== LONG_LONG_TYPE_SIZE
)
404 if (precision
== 2 * BITS_PER_WORD
)
409 if (precision
== FLOAT_TYPE_SIZE
)
411 if (precision
== DOUBLE_TYPE_SIZE
)
413 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
417 case MODE_DECIMAL_FLOAT
:
429 /* Make some target macros useable by target-independent code. */
431 targhook_words_big_endian (void)
433 return !!WORDS_BIG_ENDIAN
;
437 targhook_float_words_big_endian (void)
439 return !!FLOAT_WORDS_BIG_ENDIAN
;
442 /* True if the target supports decimal floating point. */
445 default_decimal_float_supported_p (void)
447 return ENABLE_DECIMAL_FLOAT
;
450 /* True if the target supports fixed-point arithmetic. */
453 default_fixed_point_supported_p (void)
455 return ENABLE_FIXED_POINT
;
458 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
461 This function checks whether a given INSN is valid within a low-overhead
462 loop. If INSN is invalid it returns the reason for that, otherwise it
463 returns NULL. A called function may clobber any special registers required
464 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
465 register for branch on table instructions. We reject the doloop pattern in
469 default_invalid_within_doloop (const_rtx insn
)
472 return "Function call in loop.";
474 if (JUMP_TABLE_DATA_P (insn
))
475 return "Computed branch in the loop.";
480 /* Mapping of builtin functions to vectorized variants. */
483 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
484 tree type_out ATTRIBUTE_UNUSED
,
485 tree type_in ATTRIBUTE_UNUSED
)
490 /* Vectorized conversion. */
493 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
494 tree dest_type ATTRIBUTE_UNUSED
,
495 tree src_type ATTRIBUTE_UNUSED
)
500 /* Default vectorizer cost model values. */
503 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
504 tree vectype ATTRIBUTE_UNUSED
,
505 int misalign ATTRIBUTE_UNUSED
)
507 switch (type_of_cost
)
517 case cond_branch_not_taken
:
522 case unaligned_store
:
525 case cond_branch_taken
:
536 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
537 bool md_fn ATTRIBUTE_UNUSED
,
538 bool sqrt ATTRIBUTE_UNUSED
)
544 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
545 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
546 enum machine_mode mode ATTRIBUTE_UNUSED
,
547 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
553 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
554 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
555 enum machine_mode mode ATTRIBUTE_UNUSED
,
556 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
562 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
563 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
564 enum machine_mode mode ATTRIBUTE_UNUSED
,
565 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
571 default_function_arg_advance (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
572 enum machine_mode mode ATTRIBUTE_UNUSED
,
573 const_tree type ATTRIBUTE_UNUSED
,
574 bool named ATTRIBUTE_UNUSED
)
576 #ifdef FUNCTION_ARG_ADVANCE
577 CUMULATIVE_ARGS args
= *ca
;
578 FUNCTION_ARG_ADVANCE (args
, mode
, CONST_CAST_TREE (type
), named
);
586 default_function_arg (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
587 enum machine_mode mode ATTRIBUTE_UNUSED
,
588 const_tree type ATTRIBUTE_UNUSED
,
589 bool named ATTRIBUTE_UNUSED
)
592 return FUNCTION_ARG (*ca
, mode
, CONST_CAST_TREE (type
), named
);
599 default_function_incoming_arg (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
600 enum machine_mode mode ATTRIBUTE_UNUSED
,
601 const_tree type ATTRIBUTE_UNUSED
,
602 bool named ATTRIBUTE_UNUSED
)
604 #ifdef FUNCTION_INCOMING_ARG
605 return FUNCTION_INCOMING_ARG (*ca
, mode
, CONST_CAST_TREE (type
), named
);
612 default_function_arg_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
613 const_tree type ATTRIBUTE_UNUSED
)
615 return PARM_BOUNDARY
;
619 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
624 hook_invalid_arg_for_unprototyped_fn (
625 const_tree typelist ATTRIBUTE_UNUSED
,
626 const_tree funcdecl ATTRIBUTE_UNUSED
,
627 const_tree val ATTRIBUTE_UNUSED
)
632 /* Initialize the stack protection decls. */
634 /* Stack protection related decls living in libgcc. */
635 static GTY(()) tree stack_chk_guard_decl
;
638 default_stack_protect_guard (void)
640 tree t
= stack_chk_guard_decl
;
646 t
= build_decl (UNKNOWN_LOCATION
,
647 VAR_DECL
, get_identifier ("__stack_chk_guard"),
651 DECL_EXTERNAL (t
) = 1;
653 TREE_THIS_VOLATILE (t
) = 1;
654 DECL_ARTIFICIAL (t
) = 1;
655 DECL_IGNORED_P (t
) = 1;
657 /* Do not share RTL as the declaration is visible outside of
660 RTX_FLAG (x
, used
) = 1;
662 stack_chk_guard_decl
= t
;
668 static GTY(()) tree stack_chk_fail_decl
;
671 default_external_stack_protect_fail (void)
673 tree t
= stack_chk_fail_decl
;
677 t
= build_function_type_list (void_type_node
, NULL_TREE
);
678 t
= build_decl (UNKNOWN_LOCATION
,
679 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
682 DECL_EXTERNAL (t
) = 1;
684 TREE_THIS_VOLATILE (t
) = 1;
685 TREE_NOTHROW (t
) = 1;
686 DECL_ARTIFICIAL (t
) = 1;
687 DECL_IGNORED_P (t
) = 1;
688 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
689 DECL_VISIBILITY_SPECIFIED (t
) = 1;
691 stack_chk_fail_decl
= t
;
694 return build_call_expr (t
, 0);
698 default_hidden_stack_protect_fail (void)
700 #ifndef HAVE_GAS_HIDDEN
701 return default_external_stack_protect_fail ();
703 tree t
= stack_chk_fail_decl
;
706 return default_external_stack_protect_fail ();
710 t
= build_function_type_list (void_type_node
, NULL_TREE
);
711 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
712 get_identifier ("__stack_chk_fail_local"), t
);
715 DECL_EXTERNAL (t
) = 1;
717 TREE_THIS_VOLATILE (t
) = 1;
718 TREE_NOTHROW (t
) = 1;
719 DECL_ARTIFICIAL (t
) = 1;
720 DECL_IGNORED_P (t
) = 1;
721 DECL_VISIBILITY_SPECIFIED (t
) = 1;
722 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
724 stack_chk_fail_decl
= t
;
727 return build_call_expr (t
, 0);
732 hook_bool_const_rtx_commutative_p (const_rtx x
,
733 int outer_code ATTRIBUTE_UNUSED
)
735 return COMMUTATIVE_P (x
);
739 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
740 const_tree fn_decl_or_type
,
741 bool outgoing ATTRIBUTE_UNUSED
)
743 /* The old interface doesn't handle receiving the function type. */
745 && !DECL_P (fn_decl_or_type
))
746 fn_decl_or_type
= NULL
;
748 #ifdef FUNCTION_VALUE
749 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
756 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED
,
757 const_rtx fun ATTRIBUTE_UNUSED
)
760 return LIBCALL_VALUE (mode
);
766 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
769 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
771 #ifdef FUNCTION_VALUE_REGNO_P
772 return FUNCTION_VALUE_REGNO_P (regno
);
779 default_internal_arg_pointer (void)
781 /* If the reg that the virtual arg pointer will be translated into is
782 not a fixed reg or is the stack pointer, make a copy of the virtual
783 arg pointer, and address parms via the copy. The frame pointer is
784 considered fixed even though it is not marked as such. */
785 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
786 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
787 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
788 return copy_to_reg (virtual_incoming_args_rtx
);
790 return virtual_incoming_args_rtx
;
794 default_static_chain (const_tree fndecl
, bool incoming_p
)
796 if (!DECL_STATIC_CHAIN (fndecl
))
801 #ifdef STATIC_CHAIN_INCOMING_REGNUM
802 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
806 #ifdef STATIC_CHAIN_REGNUM
807 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
811 static bool issued_error
;
815 sorry ("nested functions not supported on this target");
818 /* It really doesn't matter what we return here, so long at it
819 doesn't cause the rest of the compiler to crash. */
820 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
825 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
826 rtx
ARG_UNUSED (r_chain
))
828 sorry ("nested function trampolines not supported on this target");
832 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
833 tree funtype ATTRIBUTE_UNUSED
,
834 int size ATTRIBUTE_UNUSED
)
840 default_branch_target_register_class (void)
845 #ifdef IRA_COVER_CLASSES
847 default_ira_cover_classes (void)
849 static reg_class_t classes
[] = IRA_COVER_CLASSES
;
855 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
856 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
857 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
858 secondary_reload_info
*sri
)
860 enum reg_class rclass
= NO_REGS
;
861 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
863 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
865 sri
->icode
= sri
->prev_sri
->t_icode
;
868 #ifdef SECONDARY_INPUT_RELOAD_CLASS
870 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
872 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
874 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
876 if (rclass
!= NO_REGS
)
879 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
882 if (icode
!= CODE_FOR_nothing
883 && insn_data
[(int) icode
].operand
[in_p
].predicate
884 && ! insn_data
[(int) icode
].operand
[in_p
].predicate (x
, reload_mode
))
885 icode
= CODE_FOR_nothing
;
886 else if (icode
!= CODE_FOR_nothing
)
888 const char *insn_constraint
, *scratch_constraint
;
889 char insn_letter
, scratch_letter
;
890 enum reg_class insn_class
, scratch_class
;
892 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
893 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
894 if (!*insn_constraint
)
895 insn_class
= ALL_REGS
;
900 gcc_assert (*insn_constraint
== '=');
903 insn_letter
= *insn_constraint
;
905 = (insn_letter
== 'r' ? GENERAL_REGS
906 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
908 gcc_assert (insn_class
!= NO_REGS
);
911 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
912 /* The scratch register's constraint must start with "=&",
913 except for an input reload, where only "=" is necessary,
914 and where it might be beneficial to re-use registers from
916 gcc_assert (scratch_constraint
[0] == '='
917 && (in_p
|| scratch_constraint
[1] == '&'));
918 scratch_constraint
++;
919 if (*scratch_constraint
== '&')
920 scratch_constraint
++;
921 scratch_letter
= *scratch_constraint
;
923 = (scratch_letter
== 'r' ? GENERAL_REGS
924 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
925 scratch_constraint
));
927 if (reg_class_subset_p (reload_class
, insn_class
))
929 gcc_assert (scratch_class
== rclass
);
936 if (rclass
== NO_REGS
)
939 sri
->t_icode
= icode
;
945 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
946 const char *arg ATTRIBUTE_UNUSED
,
947 int value ATTRIBUTE_UNUSED
)
952 /* By default, if flag_pic is true, then neither local nor global relocs
953 should be placed in readonly memory. */
956 default_reloc_rw_mask (void)
958 return flag_pic
? 3 : 0;
961 /* By default, do no modification. */
962 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
969 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
974 /* Assuming that types whose size is > pointer-size are not guaranteed to be
975 naturally aligned. */
976 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
979 /* Assuming that types whose size is <= pointer-size
980 are naturally aligned. */
984 /* By default, assume that a target supports any factor of misalignment
985 memory access if it supports movmisalign patten.
986 is_packed is true if the memory access is defined in a packed struct. */
988 default_builtin_support_vector_misalignment (enum machine_mode mode
,
996 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1001 /* By default, only attempt to parallelize bitwise operations, and
1002 possibly adds/subtracts using bit-twiddling. */
1005 default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED
)
1010 /* By default only the size derived from the preferred vector mode
1014 default_autovectorize_vector_sizes (void)
1019 /* Determine whether or not a pointer mode is valid. Assume defaults
1020 of ptr_mode or Pmode - can be overridden. */
1022 default_valid_pointer_mode (enum machine_mode mode
)
1024 return (mode
== ptr_mode
|| mode
== Pmode
);
1027 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1028 for the generic address space only. */
1031 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1033 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1037 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1038 for the generic address space only. */
1041 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1043 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1047 /* Named address space version of valid_pointer_mode. */
1050 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
1052 if (!ADDR_SPACE_GENERIC_P (as
))
1053 return (mode
== targetm
.addr_space
.pointer_mode (as
)
1054 || mode
== targetm
.addr_space
.address_mode (as
));
1056 return targetm
.valid_pointer_mode (mode
);
1059 /* Some places still assume that all pointer or address modes are the
1060 standard Pmode and ptr_mode. These optimizations become invalid if
1061 the target actually supports multiple different modes. For now,
1062 we disable such optimizations on such targets, using this function. */
1065 target_default_pointer_address_modes_p (void)
1067 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1069 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1075 /* Named address space version of legitimate_address_p. */
1078 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
1079 bool strict
, addr_space_t as
)
1081 if (!ADDR_SPACE_GENERIC_P (as
))
1084 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1087 /* Named address space version of LEGITIMIZE_ADDRESS. */
1090 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
1091 enum machine_mode mode
, addr_space_t as
)
1093 if (!ADDR_SPACE_GENERIC_P (as
))
1096 return targetm
.legitimize_address (x
, oldx
, mode
);
1099 /* The default hook for determining if one named address space is a subset of
1100 another and to return which address space to use as the common address
1104 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1106 return (subset
== superset
);
1109 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1110 called for targets with only a generic address space. */
1113 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1114 tree from_type ATTRIBUTE_UNUSED
,
1115 tree to_type ATTRIBUTE_UNUSED
)
1121 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1126 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1129 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
)
1131 #ifdef GO_IF_MODE_DEPENDENT_ADDRESS
1133 GO_IF_MODE_DEPENDENT_ADDRESS (CONST_CAST_RTX (addr
), win
);
1135 /* Label `win' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */
1136 win
: ATTRIBUTE_UNUSED_LABEL
1147 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1148 tree
ARG_UNUSED (name
),
1149 tree
ARG_UNUSED (args
),
1150 int ARG_UNUSED (flags
))
1152 warning (OPT_Wattributes
,
1153 "target attribute is not supported on this machine");
1159 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1160 tree
ARG_UNUSED (pop_target
))
1162 warning (OPT_Wpragmas
,
1163 "#pragma GCC target is not supported for this machine");
1169 default_target_can_inline_p (tree caller
, tree callee
)
1172 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1173 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1175 /* If callee has no option attributes, then it is ok to inline */
1179 /* If caller has no option attributes, but callee does then it is not ok to
1181 else if (!caller_opts
)
1184 /* If both caller and callee have attributes, assume that if the pointer is
1185 different, the the two functions have different target options since
1186 build_target_option_node uses a hash table for the options. */
1188 ret
= (callee_opts
== caller_opts
);
1194 # define HAVE_casesi 0
1197 /* If the machine does not have a case insn that compares the bounds,
1198 this means extra overhead for dispatch tables, which raises the
1199 threshold for using them. */
1201 unsigned int default_case_values_threshold (void)
1203 return (HAVE_casesi
? 4 : 5);
1207 default_have_conditional_execution (void)
1209 #ifdef HAVE_conditional_execution
1210 return HAVE_conditional_execution
;
1216 /* Compute cost of moving registers to/from memory. */
1219 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1220 reg_class_t rclass ATTRIBUTE_UNUSED
,
1221 bool in ATTRIBUTE_UNUSED
)
1223 #ifndef MEMORY_MOVE_COST
1224 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1226 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1230 /* Compute cost of moving data from a register of class FROM to one of
1234 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1235 reg_class_t from ATTRIBUTE_UNUSED
,
1236 reg_class_t to ATTRIBUTE_UNUSED
)
1238 #ifndef REGISTER_MOVE_COST
1241 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1246 default_profile_before_prologue (void)
1248 #ifdef PROFILE_BEFORE_PROLOGUE
1255 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1258 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1261 #ifdef PREFERRED_RELOAD_CLASS
1262 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1268 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1271 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1274 #ifdef PREFERRED_OUTPUT_RELOAD_CLASS
1275 return PREFERRED_OUTPUT_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1281 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1283 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1288 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1291 default_class_likely_spilled_p (reg_class_t rclass
)
1293 return (reg_class_size
[(int) rclass
] == 1);
1296 /* Determine the debugging unwind mechanism for the target. */
1298 enum unwind_info_type
1299 default_debug_unwind_info (void)
1301 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1302 /* ??? Change all users to the hook, then poison this. */
1303 #ifdef DWARF2_FRAME_INFO
1304 if (DWARF2_FRAME_INFO
)
1308 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1309 #ifdef DWARF2_DEBUGGING_INFO
1310 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1317 /* Determine the exception handling mechanism for the target. */
1319 enum unwind_info_type
1320 default_except_unwind_info (struct gcc_options
*opts ATTRIBUTE_UNUSED
)
1322 /* Obey the configure switch to turn on sjlj exceptions. */
1323 #ifdef CONFIG_SJLJ_EXCEPTIONS
1324 if (CONFIG_SJLJ_EXCEPTIONS
)
1328 /* ??? Change all users to the hook, then poison this. */
1329 #ifdef DWARF2_UNWIND_INFO
1330 if (DWARF2_UNWIND_INFO
)
1337 /* To be used by targets that force dwarf2 unwind enabled. */
1339 enum unwind_info_type
1340 dwarf2_except_unwind_info (struct gcc_options
*opts ATTRIBUTE_UNUSED
)
1342 /* Obey the configure switch to turn on sjlj exceptions. */
1343 #ifdef CONFIG_SJLJ_EXCEPTIONS
1344 if (CONFIG_SJLJ_EXCEPTIONS
)
1351 /* To be used by targets that force sjlj unwind enabled. */
1353 enum unwind_info_type
1354 sjlj_except_unwind_info (struct gcc_options
*opts ATTRIBUTE_UNUSED
)
1359 /* To be used by targets where reg_raw_mode doesn't return the right
1360 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1363 default_get_reg_raw_mode(int regno
)
1365 return reg_raw_mode
[regno
];
1368 /* Return true if the state of option OPTION should be stored in PCH files
1369 and checked by default_pch_valid_p. Store the option's current state
1373 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1375 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1377 if (option_flag_var (option
, &global_options
) == &target_flags
)
1378 if (targetm
.check_pch_target_flags
)
1380 return get_option_state (&global_options
, option
, state
);
1383 /* Default version of get_pch_validity.
1384 By default, every flag difference is fatal; that will be mostly right for
1385 most targets, but completely right for very few. */
1388 default_get_pch_validity (size_t *sz
)
1390 struct cl_option_state state
;
1395 if (targetm
.check_pch_target_flags
)
1396 *sz
+= sizeof (target_flags
);
1397 for (i
= 0; i
< cl_options_count
; i
++)
1398 if (option_affects_pch_p (i
, &state
))
1401 result
= r
= XNEWVEC (char, *sz
);
1405 if (targetm
.check_pch_target_flags
)
1407 memcpy (r
, &target_flags
, sizeof (target_flags
));
1408 r
+= sizeof (target_flags
);
1411 for (i
= 0; i
< cl_options_count
; i
++)
1412 if (option_affects_pch_p (i
, &state
))
1414 memcpy (r
, state
.data
, state
.size
);
1421 /* Return a message which says that a PCH file was created with a different
1422 setting of OPTION. */
1425 pch_option_mismatch (const char *option
)
1429 asprintf (&r
, _("created and used with differing settings of '%s'"), option
);
1431 return _("out of memory");
1435 /* Default version of pch_valid_p. */
1438 default_pch_valid_p (const void *data_p
, size_t len
)
1440 struct cl_option_state state
;
1441 const char *data
= (const char *)data_p
;
1444 /* -fpic and -fpie also usually make a PCH invalid. */
1445 if (data
[0] != flag_pic
)
1446 return _("created and used with different settings of -fpic");
1447 if (data
[1] != flag_pie
)
1448 return _("created and used with different settings of -fpie");
1451 /* Check target_flags. */
1452 if (targetm
.check_pch_target_flags
)
1457 memcpy (&tf
, data
, sizeof (target_flags
));
1458 data
+= sizeof (target_flags
);
1459 len
-= sizeof (target_flags
);
1460 r
= targetm
.check_pch_target_flags (tf
);
1465 for (i
= 0; i
< cl_options_count
; i
++)
1466 if (option_affects_pch_p (i
, &state
))
1468 if (memcmp (data
, state
.data
, state
.size
) != 0)
1469 return pch_option_mismatch (cl_options
[i
].opt_text
);
1477 const struct default_options empty_optimization_table
[] =
1479 { OPT_LEVELS_NONE
, 0, NULL
, 0 }
1482 #include "gt-targhooks.h"