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"
74 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED
,
75 rtx addr ATTRIBUTE_UNUSED
,
76 bool strict ATTRIBUTE_UNUSED
)
78 #ifdef GO_IF_LEGITIMATE_ADDRESS
79 /* Defer to the old implementation using a goto. */
81 return strict_memory_address_p (mode
, addr
);
83 return memory_address_p (mode
, addr
);
90 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
92 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
93 ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file
, fun
);
98 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
102 if (GET_CODE (x
) == UNSPEC_VOLATILE
103 /* Any floating arithmetic may trap. */
104 || (SCALAR_FLOAT_MODE_P (GET_MODE (x
))
105 && flag_trapping_math
))
108 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
110 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
118 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
119 enum machine_mode mode
,
120 int *punsignedp ATTRIBUTE_UNUSED
,
121 const_tree funtype ATTRIBUTE_UNUSED
,
122 int for_return ATTRIBUTE_UNUSED
)
125 return promote_mode (type
, mode
, punsignedp
);
130 default_promote_function_mode_always_promote (const_tree type
,
131 enum machine_mode mode
,
133 const_tree funtype ATTRIBUTE_UNUSED
,
134 int for_return ATTRIBUTE_UNUSED
)
136 return promote_mode (type
, mode
, punsignedp
);
141 default_cc_modes_compatible (enum machine_mode m1
, enum machine_mode m2
)
149 default_return_in_memory (const_tree type
,
150 const_tree fntype ATTRIBUTE_UNUSED
)
152 return (TYPE_MODE (type
) == BLKmode
);
156 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
157 enum machine_mode mode ATTRIBUTE_UNUSED
)
163 default_expand_builtin_saveregs (void)
165 error ("__builtin_saveregs not supported by this target");
170 default_setup_incoming_varargs (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
171 enum machine_mode mode ATTRIBUTE_UNUSED
,
172 tree type ATTRIBUTE_UNUSED
,
173 int *pretend_arg_size ATTRIBUTE_UNUSED
,
174 int second_time ATTRIBUTE_UNUSED
)
178 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
181 default_builtin_setjmp_frame_value (void)
183 return virtual_stack_vars_rtx
;
186 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
189 hook_bool_CUMULATIVE_ARGS_false (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
)
195 default_pretend_outgoing_varargs_named (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
)
197 return (targetm
.calls
.setup_incoming_varargs
198 != default_setup_incoming_varargs
);
202 default_eh_return_filter_mode (void)
204 return targetm
.unwind_word_mode ();
208 default_libgcc_cmp_return_mode (void)
214 default_libgcc_shift_count_mode (void)
220 default_unwind_word_mode (void)
225 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
227 unsigned HOST_WIDE_INT
228 default_shift_truncation_mask (enum machine_mode mode
)
230 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
233 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
236 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED
)
238 return have_insn_for (DIV
, mode
) ? 3 : 2;
241 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
244 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED
,
245 enum machine_mode mode_rep ATTRIBUTE_UNUSED
)
250 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
253 hook_bool_CUMULATIVE_ARGS_true (CUMULATIVE_ARGS
* a ATTRIBUTE_UNUSED
)
258 /* Return machine mode for non-standard suffix
259 or VOIDmode if non-standard suffixes are unsupported. */
261 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
266 /* The generic C++ ABI specifies this is a 64-bit value. */
268 default_cxx_guard_type (void)
270 return long_long_integer_type_node
;
274 /* Returns the size of the cookie to use when allocating an array
275 whose elements have the indicated TYPE. Assumes that it is already
276 known that a cookie is needed. */
279 default_cxx_get_cookie_size (tree type
)
283 /* We need to allocate an additional max (sizeof (size_t), alignof
284 (true_type)) bytes. */
288 sizetype_size
= size_in_bytes (sizetype
);
289 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
290 if (INT_CST_LT_UNSIGNED (type_align
, sizetype_size
))
291 cookie_size
= sizetype_size
;
293 cookie_size
= type_align
;
298 /* Return true if a parameter must be passed by reference. This version
299 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
302 hook_pass_by_reference_must_pass_in_stack (CUMULATIVE_ARGS
*c ATTRIBUTE_UNUSED
,
303 enum machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
304 bool named_arg ATTRIBUTE_UNUSED
)
306 return targetm
.calls
.must_pass_in_stack (mode
, type
);
309 /* Return true if a parameter follows callee copies conventions. This
310 version of the hook is true for all named arguments. */
313 hook_callee_copies_named (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
314 enum machine_mode mode ATTRIBUTE_UNUSED
,
315 const_tree type ATTRIBUTE_UNUSED
, bool named
)
320 /* Emit to STREAM the assembler syntax for insn operand X. */
323 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
324 int code ATTRIBUTE_UNUSED
)
327 PRINT_OPERAND (stream
, x
, code
);
333 /* Emit to STREAM the assembler syntax for an insn operand whose memory
337 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
338 rtx x ATTRIBUTE_UNUSED
)
340 #ifdef PRINT_OPERAND_ADDRESS
341 PRINT_OPERAND_ADDRESS (stream
, x
);
347 /* Return true if CODE is a valid punctuation character for the
348 `print_operand' hook. */
351 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
353 #ifdef PRINT_OPERAND_PUNCT_VALID_P
354 return PRINT_OPERAND_PUNCT_VALID_P (code
);
360 /* The default implementation of TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA. */
363 default_asm_output_addr_const_extra (FILE *file ATTRIBUTE_UNUSED
,
364 rtx x ATTRIBUTE_UNUSED
)
366 #ifdef OUTPUT_ADDR_CONST_EXTRA
367 OUTPUT_ADDR_CONST_EXTRA (file
, x
, fail
);
375 /* True if MODE is valid for the target. By "valid", we mean able to
376 be manipulated in non-trivial ways. In particular, this means all
377 the arithmetic is supported.
379 By default we guess this means that any C type is supported. If
380 we can't map the mode back to a type that would be available in C,
381 then reject it. Special case, here, is the double-word arithmetic
382 supported by optabs.c. */
385 default_scalar_mode_supported_p (enum machine_mode mode
)
387 int precision
= GET_MODE_PRECISION (mode
);
389 switch (GET_MODE_CLASS (mode
))
391 case MODE_PARTIAL_INT
:
393 if (precision
== CHAR_TYPE_SIZE
)
395 if (precision
== SHORT_TYPE_SIZE
)
397 if (precision
== INT_TYPE_SIZE
)
399 if (precision
== LONG_TYPE_SIZE
)
401 if (precision
== LONG_LONG_TYPE_SIZE
)
403 if (precision
== 2 * BITS_PER_WORD
)
408 if (precision
== FLOAT_TYPE_SIZE
)
410 if (precision
== DOUBLE_TYPE_SIZE
)
412 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
416 case MODE_DECIMAL_FLOAT
:
428 /* Make some target macros useable by target-independent code. */
430 targhook_words_big_endian (void)
432 return !!WORDS_BIG_ENDIAN
;
436 targhook_float_words_big_endian (void)
438 return !!FLOAT_WORDS_BIG_ENDIAN
;
441 /* True if the target supports decimal floating point. */
444 default_decimal_float_supported_p (void)
446 return ENABLE_DECIMAL_FLOAT
;
449 /* True if the target supports fixed-point arithmetic. */
452 default_fixed_point_supported_p (void)
454 return ENABLE_FIXED_POINT
;
457 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
460 This function checks whether a given INSN is valid within a low-overhead
461 loop. If INSN is invalid it returns the reason for that, otherwise it
462 returns NULL. A called function may clobber any special registers required
463 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
464 register for branch on table instructions. We reject the doloop pattern in
468 default_invalid_within_doloop (const_rtx insn
)
471 return "Function call in loop.";
473 if (JUMP_TABLE_DATA_P (insn
))
474 return "Computed branch in the loop.";
479 /* Mapping of builtin functions to vectorized variants. */
482 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
483 tree type_out ATTRIBUTE_UNUSED
,
484 tree type_in ATTRIBUTE_UNUSED
)
489 /* Vectorized conversion. */
492 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
493 tree dest_type ATTRIBUTE_UNUSED
,
494 tree src_type ATTRIBUTE_UNUSED
)
499 /* Default vectorizer cost model values. */
502 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
503 tree vectype ATTRIBUTE_UNUSED
,
504 int misalign ATTRIBUTE_UNUSED
)
506 switch (type_of_cost
)
516 case cond_branch_not_taken
:
521 case unaligned_store
:
524 case cond_branch_taken
:
535 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
536 bool md_fn ATTRIBUTE_UNUSED
,
537 bool sqrt ATTRIBUTE_UNUSED
)
543 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
544 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
545 enum machine_mode mode ATTRIBUTE_UNUSED
,
546 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
552 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
553 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
554 enum machine_mode mode ATTRIBUTE_UNUSED
,
555 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
561 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
562 CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
563 enum machine_mode mode ATTRIBUTE_UNUSED
,
564 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
570 default_function_arg_advance (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_ARG_ADVANCE
576 CUMULATIVE_ARGS args
= *ca
;
577 FUNCTION_ARG_ADVANCE (args
, mode
, CONST_CAST_TREE (type
), named
);
585 default_function_arg (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
586 enum machine_mode mode ATTRIBUTE_UNUSED
,
587 const_tree type ATTRIBUTE_UNUSED
,
588 bool named ATTRIBUTE_UNUSED
)
591 return FUNCTION_ARG (*ca
, mode
, CONST_CAST_TREE (type
), named
);
598 default_function_incoming_arg (CUMULATIVE_ARGS
*ca ATTRIBUTE_UNUSED
,
599 enum machine_mode mode ATTRIBUTE_UNUSED
,
600 const_tree type ATTRIBUTE_UNUSED
,
601 bool named ATTRIBUTE_UNUSED
)
603 #ifdef FUNCTION_INCOMING_ARG
604 return FUNCTION_INCOMING_ARG (*ca
, mode
, CONST_CAST_TREE (type
), named
);
611 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
616 hook_invalid_arg_for_unprototyped_fn (
617 const_tree typelist ATTRIBUTE_UNUSED
,
618 const_tree funcdecl ATTRIBUTE_UNUSED
,
619 const_tree val ATTRIBUTE_UNUSED
)
624 /* Initialize the stack protection decls. */
626 /* Stack protection related decls living in libgcc. */
627 static GTY(()) tree stack_chk_guard_decl
;
630 default_stack_protect_guard (void)
632 tree t
= stack_chk_guard_decl
;
638 t
= build_decl (UNKNOWN_LOCATION
,
639 VAR_DECL
, get_identifier ("__stack_chk_guard"),
643 DECL_EXTERNAL (t
) = 1;
645 TREE_THIS_VOLATILE (t
) = 1;
646 DECL_ARTIFICIAL (t
) = 1;
647 DECL_IGNORED_P (t
) = 1;
649 /* Do not share RTL as the declaration is visible outside of
652 RTX_FLAG (x
, used
) = 1;
654 stack_chk_guard_decl
= t
;
660 static GTY(()) tree stack_chk_fail_decl
;
663 default_external_stack_protect_fail (void)
665 tree t
= stack_chk_fail_decl
;
669 t
= build_function_type_list (void_type_node
, NULL_TREE
);
670 t
= build_decl (UNKNOWN_LOCATION
,
671 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
674 DECL_EXTERNAL (t
) = 1;
676 TREE_THIS_VOLATILE (t
) = 1;
677 TREE_NOTHROW (t
) = 1;
678 DECL_ARTIFICIAL (t
) = 1;
679 DECL_IGNORED_P (t
) = 1;
680 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
681 DECL_VISIBILITY_SPECIFIED (t
) = 1;
683 stack_chk_fail_decl
= t
;
686 return build_call_expr (t
, 0);
690 default_hidden_stack_protect_fail (void)
692 #ifndef HAVE_GAS_HIDDEN
693 return default_external_stack_protect_fail ();
695 tree t
= stack_chk_fail_decl
;
698 return default_external_stack_protect_fail ();
702 t
= build_function_type_list (void_type_node
, NULL_TREE
);
703 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
704 get_identifier ("__stack_chk_fail_local"), t
);
707 DECL_EXTERNAL (t
) = 1;
709 TREE_THIS_VOLATILE (t
) = 1;
710 TREE_NOTHROW (t
) = 1;
711 DECL_ARTIFICIAL (t
) = 1;
712 DECL_IGNORED_P (t
) = 1;
713 DECL_VISIBILITY_SPECIFIED (t
) = 1;
714 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
716 stack_chk_fail_decl
= t
;
719 return build_call_expr (t
, 0);
724 hook_bool_const_rtx_commutative_p (const_rtx x
,
725 int outer_code ATTRIBUTE_UNUSED
)
727 return COMMUTATIVE_P (x
);
731 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
732 const_tree fn_decl_or_type
,
733 bool outgoing ATTRIBUTE_UNUSED
)
735 /* The old interface doesn't handle receiving the function type. */
737 && !DECL_P (fn_decl_or_type
))
738 fn_decl_or_type
= NULL
;
740 #ifdef FUNCTION_VALUE
741 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
748 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED
,
749 const_rtx fun ATTRIBUTE_UNUSED
)
752 return LIBCALL_VALUE (mode
);
758 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
761 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
763 #ifdef FUNCTION_VALUE_REGNO_P
764 return FUNCTION_VALUE_REGNO_P (regno
);
771 default_internal_arg_pointer (void)
773 /* If the reg that the virtual arg pointer will be translated into is
774 not a fixed reg or is the stack pointer, make a copy of the virtual
775 arg pointer, and address parms via the copy. The frame pointer is
776 considered fixed even though it is not marked as such. */
777 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
778 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
779 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
780 return copy_to_reg (virtual_incoming_args_rtx
);
782 return virtual_incoming_args_rtx
;
786 default_static_chain (const_tree fndecl
, bool incoming_p
)
788 if (!DECL_STATIC_CHAIN (fndecl
))
793 #ifdef STATIC_CHAIN_INCOMING_REGNUM
794 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
798 #ifdef STATIC_CHAIN_REGNUM
799 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
803 static bool issued_error
;
807 sorry ("nested functions not supported on this target");
810 /* It really doesn't matter what we return here, so long at it
811 doesn't cause the rest of the compiler to crash. */
812 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
817 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
818 rtx
ARG_UNUSED (r_chain
))
820 sorry ("nested function trampolines not supported on this target");
824 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
825 tree funtype ATTRIBUTE_UNUSED
,
826 int size ATTRIBUTE_UNUSED
)
832 default_branch_target_register_class (void)
837 #ifdef IRA_COVER_CLASSES
839 default_ira_cover_classes (void)
841 static reg_class_t classes
[] = IRA_COVER_CLASSES
;
847 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
848 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
849 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
850 secondary_reload_info
*sri
)
852 enum reg_class rclass
= NO_REGS
;
853 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
855 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
857 sri
->icode
= sri
->prev_sri
->t_icode
;
860 #ifdef SECONDARY_INPUT_RELOAD_CLASS
862 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
864 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
866 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
868 if (rclass
!= NO_REGS
)
871 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
874 if (icode
!= CODE_FOR_nothing
875 && insn_data
[(int) icode
].operand
[in_p
].predicate
876 && ! insn_data
[(int) icode
].operand
[in_p
].predicate (x
, reload_mode
))
877 icode
= CODE_FOR_nothing
;
878 else if (icode
!= CODE_FOR_nothing
)
880 const char *insn_constraint
, *scratch_constraint
;
881 char insn_letter
, scratch_letter
;
882 enum reg_class insn_class
, scratch_class
;
884 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
885 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
886 if (!*insn_constraint
)
887 insn_class
= ALL_REGS
;
892 gcc_assert (*insn_constraint
== '=');
895 insn_letter
= *insn_constraint
;
897 = (insn_letter
== 'r' ? GENERAL_REGS
898 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
900 gcc_assert (insn_class
!= NO_REGS
);
903 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
904 /* The scratch register's constraint must start with "=&",
905 except for an input reload, where only "=" is necessary,
906 and where it might be beneficial to re-use registers from
908 gcc_assert (scratch_constraint
[0] == '='
909 && (in_p
|| scratch_constraint
[1] == '&'));
910 scratch_constraint
++;
911 if (*scratch_constraint
== '&')
912 scratch_constraint
++;
913 scratch_letter
= *scratch_constraint
;
915 = (scratch_letter
== 'r' ? GENERAL_REGS
916 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
917 scratch_constraint
));
919 if (reg_class_subset_p (reload_class
, insn_class
))
921 gcc_assert (scratch_class
== rclass
);
928 if (rclass
== NO_REGS
)
931 sri
->t_icode
= icode
;
937 default_handle_c_option (size_t code ATTRIBUTE_UNUSED
,
938 const char *arg ATTRIBUTE_UNUSED
,
939 int value ATTRIBUTE_UNUSED
)
944 /* By default, if flag_pic is true, then neither local nor global relocs
945 should be placed in readonly memory. */
948 default_reloc_rw_mask (void)
950 return flag_pic
? 3 : 0;
953 /* By default, do no modification. */
954 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
961 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
966 /* Assuming that types whose size is > pointer-size are not guaranteed to be
967 naturally aligned. */
968 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
971 /* Assuming that types whose size is <= pointer-size
972 are naturally aligned. */
976 /* By default, assume that a target supports any factor of misalignment
977 memory access if it supports movmisalign patten.
978 is_packed is true if the memory access is defined in a packed struct. */
980 default_builtin_support_vector_misalignment (enum machine_mode mode
,
988 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
993 /* By default, only attempt to parallelize bitwise operations, and
994 possibly adds/subtracts using bit-twiddling. */
997 default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED
)
1002 /* By default only the size derived from the preferred vector mode
1006 default_autovectorize_vector_sizes (void)
1011 /* Determine whether or not a pointer mode is valid. Assume defaults
1012 of ptr_mode or Pmode - can be overridden. */
1014 default_valid_pointer_mode (enum machine_mode mode
)
1016 return (mode
== ptr_mode
|| mode
== Pmode
);
1019 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1020 for the generic address space only. */
1023 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1025 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1029 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1030 for the generic address space only. */
1033 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1035 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1039 /* Named address space version of valid_pointer_mode. */
1042 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
1044 if (!ADDR_SPACE_GENERIC_P (as
))
1045 return (mode
== targetm
.addr_space
.pointer_mode (as
)
1046 || mode
== targetm
.addr_space
.address_mode (as
));
1048 return targetm
.valid_pointer_mode (mode
);
1051 /* Some places still assume that all pointer or address modes are the
1052 standard Pmode and ptr_mode. These optimizations become invalid if
1053 the target actually supports multiple different modes. For now,
1054 we disable such optimizations on such targets, using this function. */
1057 target_default_pointer_address_modes_p (void)
1059 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1061 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1067 /* Named address space version of legitimate_address_p. */
1070 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
1071 bool strict
, addr_space_t as
)
1073 if (!ADDR_SPACE_GENERIC_P (as
))
1076 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1079 /* Named address space version of LEGITIMIZE_ADDRESS. */
1082 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
1083 enum machine_mode mode
, addr_space_t as
)
1085 if (!ADDR_SPACE_GENERIC_P (as
))
1088 return targetm
.legitimize_address (x
, oldx
, mode
);
1091 /* The default hook for determining if one named address space is a subset of
1092 another and to return which address space to use as the common address
1096 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1098 return (subset
== superset
);
1101 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1102 called for targets with only a generic address space. */
1105 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1106 tree from_type ATTRIBUTE_UNUSED
,
1107 tree to_type ATTRIBUTE_UNUSED
)
1113 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1118 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1121 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
)
1123 #ifdef GO_IF_MODE_DEPENDENT_ADDRESS
1125 GO_IF_MODE_DEPENDENT_ADDRESS (CONST_CAST_RTX (addr
), win
);
1127 /* Label `win' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */
1128 win
: ATTRIBUTE_UNUSED_LABEL
1139 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1140 tree
ARG_UNUSED (name
),
1141 tree
ARG_UNUSED (args
),
1142 int ARG_UNUSED (flags
))
1144 warning (OPT_Wattributes
,
1145 "target attribute is not supported on this machine");
1151 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1152 tree
ARG_UNUSED (pop_target
))
1154 warning (OPT_Wpragmas
,
1155 "#pragma GCC target is not supported for this machine");
1161 default_target_can_inline_p (tree caller
, tree callee
)
1164 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1165 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1167 /* If callee has no option attributes, then it is ok to inline */
1171 /* If caller has no option attributes, but callee does then it is not ok to
1173 else if (!caller_opts
)
1176 /* If both caller and callee have attributes, assume that if the pointer is
1177 different, the the two functions have different target options since
1178 build_target_option_node uses a hash table for the options. */
1180 ret
= (callee_opts
== caller_opts
);
1186 # define HAVE_casesi 0
1189 /* If the machine does not have a case insn that compares the bounds,
1190 this means extra overhead for dispatch tables, which raises the
1191 threshold for using them. */
1193 unsigned int default_case_values_threshold (void)
1195 return (HAVE_casesi
? 4 : 5);
1199 default_have_conditional_execution (void)
1201 #ifdef HAVE_conditional_execution
1202 return HAVE_conditional_execution
;
1208 /* Compute cost of moving registers to/from memory. */
1211 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1212 reg_class_t rclass ATTRIBUTE_UNUSED
,
1213 bool in ATTRIBUTE_UNUSED
)
1215 #ifndef MEMORY_MOVE_COST
1216 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1218 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1222 /* Compute cost of moving data from a register of class FROM to one of
1226 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1227 reg_class_t from ATTRIBUTE_UNUSED
,
1228 reg_class_t to ATTRIBUTE_UNUSED
)
1230 #ifndef REGISTER_MOVE_COST
1233 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1238 default_profile_before_prologue (void)
1240 #ifdef PROFILE_BEFORE_PROLOGUE
1247 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1250 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1253 #ifdef PREFERRED_RELOAD_CLASS
1254 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1260 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1263 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1266 #ifdef PREFERRED_OUTPUT_RELOAD_CLASS
1267 return PREFERRED_OUTPUT_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1273 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1276 default_class_likely_spilled_p (reg_class_t rclass
)
1278 return (reg_class_size
[(int) rclass
] == 1);
1281 /* Determine the debugging unwind mechanism for the target. */
1283 enum unwind_info_type
1284 default_debug_unwind_info (void)
1286 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1287 /* ??? Change all users to the hook, then poison this. */
1288 #ifdef DWARF2_FRAME_INFO
1289 if (DWARF2_FRAME_INFO
)
1293 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1294 #ifdef DWARF2_DEBUGGING_INFO
1295 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1302 /* Determine the exception handling mechanism for the target. */
1304 enum unwind_info_type
1305 default_except_unwind_info (void)
1307 /* ??? Change the one user to the hook, then poison this. */
1308 #ifdef MUST_USE_SJLJ_EXCEPTIONS
1309 if (MUST_USE_SJLJ_EXCEPTIONS
)
1313 /* Obey the configure switch to turn on sjlj exceptions. */
1314 #ifdef CONFIG_SJLJ_EXCEPTIONS
1315 if (CONFIG_SJLJ_EXCEPTIONS
)
1319 /* ??? Change all users to the hook, then poison this. */
1320 #ifdef DWARF2_UNWIND_INFO
1321 if (DWARF2_UNWIND_INFO
)
1328 /* To be used by targets that force dwarf2 unwind enabled. */
1330 enum unwind_info_type
1331 dwarf2_except_unwind_info (void)
1333 /* Obey the configure switch to turn on sjlj exceptions. */
1334 #ifdef CONFIG_SJLJ_EXCEPTIONS
1335 if (CONFIG_SJLJ_EXCEPTIONS
)
1342 /* To be used by targets that force sjlj unwind enabled. */
1344 enum unwind_info_type
1345 sjlj_except_unwind_info (void)
1350 /* To be used by targets where reg_raw_mode doesn't return the right
1351 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1354 default_get_reg_raw_mode(int regno
)
1356 return reg_raw_mode
[regno
];
1359 const struct default_options empty_optimization_table
[] =
1361 { OPT_LEVELS_NONE
, 0, NULL
, 0 }
1364 #include "gt-targhooks.h"