1 /* Default target hook functions.
2 Copyright (C) 2003-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* The migration of target macros to target hooks works as follows:
22 1. Create a target hook that uses the existing target macros to
23 implement the same functionality.
25 2. Convert all the MI files to use the hook instead of the macro.
27 3. Repeat for a majority of the remaining target macros. This will
30 4. Tell target maintainers to start migrating.
32 5. Eventually convert the backends to override the hook instead of
33 defining the macros. This will take some time too.
35 6. TBD when, poison the macros. Unmigrated targets will break at
38 Note that we expect steps 1-3 to be done by the people that
39 understand what the MI does with each macro, and step 5 to be done
40 by the target maintainers for their respective targets.
42 Note that steps 1 and 2 don't have to be done together, but no
43 target can override the new hook until step 2 is complete for it.
45 Once the macros are poisoned, we will revert to the old migration
46 rules - migrate the macro, callers, and targets all at once. This
47 comment can thus be removed at that point. */
51 #include "coretypes.h"
58 #include "diagnostic-core.h"
62 #include "target-def.h"
64 #include "hard-reg-set.h"
72 #include "tree-ssa-alias.h"
73 #include "insn-codes.h"
77 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED
,
78 rtx addr ATTRIBUTE_UNUSED
,
79 bool strict ATTRIBUTE_UNUSED
)
81 #ifdef GO_IF_LEGITIMATE_ADDRESS
82 /* Defer to the old implementation using a goto. */
84 return strict_memory_address_p (mode
, addr
);
86 return memory_address_p (mode
, addr
);
93 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
95 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
96 ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file
, fun
);
101 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
105 /* Any floating arithmetic may trap. */
106 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && 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
)
125 if (type
!= NULL_TREE
&& for_return
== 2)
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_t 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_t ca ATTRIBUTE_UNUSED
)
196 default_pretend_outgoing_varargs_named (cumulative_args_t 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_t 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_t 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_t 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_MANGLE_ASSEMBLER_NAME. */
363 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
365 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
366 const char *stripped
= targetm
.strip_name_encoding (skipped
);
367 if (*name
!= '*' && user_label_prefix
[0])
368 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
369 return get_identifier (stripped
);
372 /* True if MODE is valid for the target. By "valid", we mean able to
373 be manipulated in non-trivial ways. In particular, this means all
374 the arithmetic is supported.
376 By default we guess this means that any C type is supported. If
377 we can't map the mode back to a type that would be available in C,
378 then reject it. Special case, here, is the double-word arithmetic
379 supported by optabs.c. */
382 default_scalar_mode_supported_p (enum machine_mode mode
)
384 int precision
= GET_MODE_PRECISION (mode
);
386 switch (GET_MODE_CLASS (mode
))
388 case MODE_PARTIAL_INT
:
390 if (precision
== CHAR_TYPE_SIZE
)
392 if (precision
== SHORT_TYPE_SIZE
)
394 if (precision
== INT_TYPE_SIZE
)
396 if (precision
== LONG_TYPE_SIZE
)
398 if (precision
== LONG_LONG_TYPE_SIZE
)
400 if (precision
== 2 * BITS_PER_WORD
)
405 if (precision
== FLOAT_TYPE_SIZE
)
407 if (precision
== DOUBLE_TYPE_SIZE
)
409 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
413 case MODE_DECIMAL_FLOAT
:
425 /* Make some target macros useable by target-independent code. */
427 targhook_words_big_endian (void)
429 return !!WORDS_BIG_ENDIAN
;
433 targhook_float_words_big_endian (void)
435 return !!FLOAT_WORDS_BIG_ENDIAN
;
438 /* True if the target supports decimal floating point. */
441 default_decimal_float_supported_p (void)
443 return ENABLE_DECIMAL_FLOAT
;
446 /* True if the target supports fixed-point arithmetic. */
449 default_fixed_point_supported_p (void)
451 return ENABLE_FIXED_POINT
;
454 /* True if the target supports GNU indirect functions. */
457 default_has_ifunc_p (void)
459 return HAVE_GNU_INDIRECT_FUNCTION
;
462 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
465 This function checks whether a given INSN is valid within a low-overhead
466 loop. If INSN is invalid it returns the reason for that, otherwise it
467 returns NULL. A called function may clobber any special registers required
468 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
469 register for branch on table instructions. We reject the doloop pattern in
473 default_invalid_within_doloop (const_rtx insn
)
476 return "Function call in loop.";
478 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
479 return "Computed branch in the loop.";
484 /* Mapping of builtin functions to vectorized variants. */
487 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
488 tree type_out ATTRIBUTE_UNUSED
,
489 tree type_in ATTRIBUTE_UNUSED
)
494 /* Vectorized conversion. */
497 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
498 tree dest_type ATTRIBUTE_UNUSED
,
499 tree src_type ATTRIBUTE_UNUSED
)
504 /* Default vectorizer cost model values. */
507 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
509 int misalign ATTRIBUTE_UNUSED
)
513 switch (type_of_cost
)
523 case cond_branch_not_taken
:
525 case vec_promote_demote
:
529 case unaligned_store
:
532 case cond_branch_taken
:
536 elements
= TYPE_VECTOR_SUBPARTS (vectype
);
537 return elements
/ 2 + 1;
547 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
548 bool md_fn ATTRIBUTE_UNUSED
,
549 bool sqrt ATTRIBUTE_UNUSED
)
555 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
556 cumulative_args_t ca ATTRIBUTE_UNUSED
,
557 enum machine_mode mode ATTRIBUTE_UNUSED
,
558 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
564 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
565 cumulative_args_t ca ATTRIBUTE_UNUSED
,
566 enum machine_mode mode ATTRIBUTE_UNUSED
,
567 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
573 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
574 cumulative_args_t ca ATTRIBUTE_UNUSED
,
575 enum machine_mode mode ATTRIBUTE_UNUSED
,
576 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
582 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
583 enum machine_mode mode ATTRIBUTE_UNUSED
,
584 const_tree type ATTRIBUTE_UNUSED
,
585 bool named ATTRIBUTE_UNUSED
)
591 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
592 enum machine_mode mode ATTRIBUTE_UNUSED
,
593 const_tree type ATTRIBUTE_UNUSED
,
594 bool named ATTRIBUTE_UNUSED
)
600 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
601 enum machine_mode mode ATTRIBUTE_UNUSED
,
602 const_tree type ATTRIBUTE_UNUSED
,
603 bool named ATTRIBUTE_UNUSED
)
609 default_function_arg_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
610 const_tree type ATTRIBUTE_UNUSED
)
612 return PARM_BOUNDARY
;
616 default_function_arg_round_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
617 const_tree type ATTRIBUTE_UNUSED
)
619 return PARM_BOUNDARY
;
623 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
628 hook_invalid_arg_for_unprototyped_fn (
629 const_tree typelist ATTRIBUTE_UNUSED
,
630 const_tree funcdecl ATTRIBUTE_UNUSED
,
631 const_tree val ATTRIBUTE_UNUSED
)
636 /* Initialize the stack protection decls. */
638 /* Stack protection related decls living in libgcc. */
639 static GTY(()) tree stack_chk_guard_decl
;
642 default_stack_protect_guard (void)
644 tree t
= stack_chk_guard_decl
;
650 t
= build_decl (UNKNOWN_LOCATION
,
651 VAR_DECL
, get_identifier ("__stack_chk_guard"),
655 DECL_EXTERNAL (t
) = 1;
657 TREE_THIS_VOLATILE (t
) = 1;
658 DECL_ARTIFICIAL (t
) = 1;
659 DECL_IGNORED_P (t
) = 1;
661 /* Do not share RTL as the declaration is visible outside of
664 RTX_FLAG (x
, used
) = 1;
666 stack_chk_guard_decl
= t
;
672 static GTY(()) tree stack_chk_fail_decl
;
675 default_external_stack_protect_fail (void)
677 tree t
= stack_chk_fail_decl
;
681 t
= build_function_type_list (void_type_node
, NULL_TREE
);
682 t
= build_decl (UNKNOWN_LOCATION
,
683 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
686 DECL_EXTERNAL (t
) = 1;
688 TREE_THIS_VOLATILE (t
) = 1;
689 TREE_NOTHROW (t
) = 1;
690 DECL_ARTIFICIAL (t
) = 1;
691 DECL_IGNORED_P (t
) = 1;
692 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
693 DECL_VISIBILITY_SPECIFIED (t
) = 1;
695 stack_chk_fail_decl
= t
;
698 return build_call_expr (t
, 0);
702 default_hidden_stack_protect_fail (void)
704 #ifndef HAVE_GAS_HIDDEN
705 return default_external_stack_protect_fail ();
707 tree t
= stack_chk_fail_decl
;
710 return default_external_stack_protect_fail ();
714 t
= build_function_type_list (void_type_node
, NULL_TREE
);
715 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
716 get_identifier ("__stack_chk_fail_local"), t
);
719 DECL_EXTERNAL (t
) = 1;
721 TREE_THIS_VOLATILE (t
) = 1;
722 TREE_NOTHROW (t
) = 1;
723 DECL_ARTIFICIAL (t
) = 1;
724 DECL_IGNORED_P (t
) = 1;
725 DECL_VISIBILITY_SPECIFIED (t
) = 1;
726 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
728 stack_chk_fail_decl
= t
;
731 return build_call_expr (t
, 0);
736 hook_bool_const_rtx_commutative_p (const_rtx x
,
737 int outer_code ATTRIBUTE_UNUSED
)
739 return COMMUTATIVE_P (x
);
743 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
744 const_tree fn_decl_or_type
,
745 bool outgoing ATTRIBUTE_UNUSED
)
747 /* The old interface doesn't handle receiving the function type. */
749 && !DECL_P (fn_decl_or_type
))
750 fn_decl_or_type
= NULL
;
752 #ifdef FUNCTION_VALUE
753 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
760 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED
,
761 const_rtx fun ATTRIBUTE_UNUSED
)
764 return LIBCALL_VALUE (mode
);
770 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
773 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
775 #ifdef FUNCTION_VALUE_REGNO_P
776 return FUNCTION_VALUE_REGNO_P (regno
);
783 default_internal_arg_pointer (void)
785 /* If the reg that the virtual arg pointer will be translated into is
786 not a fixed reg or is the stack pointer, make a copy of the virtual
787 arg pointer, and address parms via the copy. The frame pointer is
788 considered fixed even though it is not marked as such. */
789 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
790 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
791 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
792 return copy_to_reg (virtual_incoming_args_rtx
);
794 return virtual_incoming_args_rtx
;
798 default_static_chain (const_tree fndecl
, bool incoming_p
)
800 if (!DECL_STATIC_CHAIN (fndecl
))
805 #ifdef STATIC_CHAIN_INCOMING_REGNUM
806 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
810 #ifdef STATIC_CHAIN_REGNUM
811 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
815 static bool issued_error
;
819 sorry ("nested functions not supported on this target");
822 /* It really doesn't matter what we return here, so long at it
823 doesn't cause the rest of the compiler to crash. */
824 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
829 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
830 rtx
ARG_UNUSED (r_chain
))
832 sorry ("nested function trampolines not supported on this target");
836 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
837 tree funtype ATTRIBUTE_UNUSED
,
838 int size ATTRIBUTE_UNUSED
)
844 default_branch_target_register_class (void)
856 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
862 default_register_usage_leveling_p (void)
868 default_different_addr_displacement_p (void)
874 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
875 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
876 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
877 secondary_reload_info
*sri
)
879 enum reg_class rclass
= NO_REGS
;
880 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
882 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
884 sri
->icode
= sri
->prev_sri
->t_icode
;
887 #ifdef SECONDARY_INPUT_RELOAD_CLASS
889 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
891 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
893 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
895 if (rclass
!= NO_REGS
)
898 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
901 if (icode
!= CODE_FOR_nothing
902 && !insn_operand_matches (icode
, in_p
, x
))
903 icode
= CODE_FOR_nothing
;
904 else if (icode
!= CODE_FOR_nothing
)
906 const char *insn_constraint
, *scratch_constraint
;
907 char insn_letter
, scratch_letter
;
908 enum reg_class insn_class
, scratch_class
;
910 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
911 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
912 if (!*insn_constraint
)
913 insn_class
= ALL_REGS
;
918 gcc_assert (*insn_constraint
== '=');
921 insn_letter
= *insn_constraint
;
923 = (insn_letter
== 'r' ? GENERAL_REGS
924 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
926 gcc_assert (insn_class
!= NO_REGS
);
929 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
930 /* The scratch register's constraint must start with "=&",
931 except for an input reload, where only "=" is necessary,
932 and where it might be beneficial to re-use registers from
934 gcc_assert (scratch_constraint
[0] == '='
935 && (in_p
|| scratch_constraint
[1] == '&'));
936 scratch_constraint
++;
937 if (*scratch_constraint
== '&')
938 scratch_constraint
++;
939 scratch_letter
= *scratch_constraint
;
941 = (scratch_letter
== 'r' ? GENERAL_REGS
942 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
943 scratch_constraint
));
945 if (reg_class_subset_p (reload_class
, insn_class
))
947 gcc_assert (scratch_class
== rclass
);
954 if (rclass
== NO_REGS
)
957 sri
->t_icode
= icode
;
962 /* By default, if flag_pic is true, then neither local nor global relocs
963 should be placed in readonly memory. */
966 default_reloc_rw_mask (void)
968 return flag_pic
? 3 : 0;
971 /* By default, do no modification. */
972 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
978 /* Default to natural alignment for vector types. */
980 default_vector_alignment (const_tree type
)
982 return tree_low_cst (TYPE_SIZE (type
), 0);
986 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
991 /* Assuming that types whose size is > pointer-size are not guaranteed to be
992 naturally aligned. */
993 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
996 /* Assuming that types whose size is <= pointer-size
997 are naturally aligned. */
1001 /* By default, assume that a target supports any factor of misalignment
1002 memory access if it supports movmisalign patten.
1003 is_packed is true if the memory access is defined in a packed struct. */
1005 default_builtin_support_vector_misalignment (enum machine_mode mode
,
1013 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1018 /* By default, only attempt to parallelize bitwise operations, and
1019 possibly adds/subtracts using bit-twiddling. */
1022 default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED
)
1027 /* By default only the size derived from the preferred vector mode
1031 default_autovectorize_vector_sizes (void)
1036 /* By default, the cost model accumulates three separate costs (prologue,
1037 loop body, and epilogue) for a vectorized loop or block. So allocate an
1038 array of three unsigned ints, set it to zero, and return its address. */
1041 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1043 unsigned *cost
= XNEWVEC (unsigned, 3);
1044 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1048 /* By default, the cost model looks up the cost of the given statement
1049 kind and mode, multiplies it by the occurrence count, accumulates
1050 it into the cost specified by WHERE, and returns the cost added. */
1053 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1054 struct _stmt_vec_info
*stmt_info
, int misalign
,
1055 enum vect_cost_model_location where
)
1057 unsigned *cost
= (unsigned *) data
;
1058 unsigned retval
= 0;
1060 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1061 int stmt_cost
= default_builtin_vectorization_cost (kind
, vectype
,
1063 /* Statements in an inner loop relative to the loop being
1064 vectorized are weighted more heavily. The value here is
1065 arbitrary and could potentially be improved with analysis. */
1066 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1067 count
*= 50; /* FIXME. */
1069 retval
= (unsigned) (count
* stmt_cost
);
1070 cost
[where
] += retval
;
1075 /* By default, the cost model just returns the accumulated costs. */
1078 default_finish_cost (void *data
, unsigned *prologue_cost
,
1079 unsigned *body_cost
, unsigned *epilogue_cost
)
1081 unsigned *cost
= (unsigned *) data
;
1082 *prologue_cost
= cost
[vect_prologue
];
1083 *body_cost
= cost
[vect_body
];
1084 *epilogue_cost
= cost
[vect_epilogue
];
1087 /* Free the cost data. */
1090 default_destroy_cost_data (void *data
)
1095 /* Determine whether or not a pointer mode is valid. Assume defaults
1096 of ptr_mode or Pmode - can be overridden. */
1098 default_valid_pointer_mode (enum machine_mode mode
)
1100 return (mode
== ptr_mode
|| mode
== Pmode
);
1103 /* Determine whether the memory reference specified by REF may alias
1104 the C libraries errno location. */
1106 default_ref_may_alias_errno (ao_ref
*ref
)
1108 tree base
= ao_ref_base (ref
);
1109 /* The default implementation assumes the errno location is
1110 a declaration of type int or is always accessed via a
1111 pointer to int. We assume that accesses to errno are
1112 not deliberately obfuscated (even in conforming ways). */
1113 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1114 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1116 /* The default implementation assumes an errno location
1117 declaration is never defined in the current compilation unit. */
1119 && !TREE_STATIC (base
))
1121 else if (TREE_CODE (base
) == MEM_REF
1122 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1124 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1125 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1130 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1131 for the generic address space only. */
1134 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1136 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1140 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1141 for the generic address space only. */
1144 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1146 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1150 /* Named address space version of valid_pointer_mode. */
1153 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
1155 if (!ADDR_SPACE_GENERIC_P (as
))
1156 return (mode
== targetm
.addr_space
.pointer_mode (as
)
1157 || mode
== targetm
.addr_space
.address_mode (as
));
1159 return targetm
.valid_pointer_mode (mode
);
1162 /* Some places still assume that all pointer or address modes are the
1163 standard Pmode and ptr_mode. These optimizations become invalid if
1164 the target actually supports multiple different modes. For now,
1165 we disable such optimizations on such targets, using this function. */
1168 target_default_pointer_address_modes_p (void)
1170 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1172 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1178 /* Named address space version of legitimate_address_p. */
1181 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
1182 bool strict
, addr_space_t as
)
1184 if (!ADDR_SPACE_GENERIC_P (as
))
1187 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1190 /* Named address space version of LEGITIMIZE_ADDRESS. */
1193 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
1194 enum machine_mode mode
, addr_space_t as
)
1196 if (!ADDR_SPACE_GENERIC_P (as
))
1199 return targetm
.legitimize_address (x
, oldx
, mode
);
1202 /* The default hook for determining if one named address space is a subset of
1203 another and to return which address space to use as the common address
1207 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1209 return (subset
== superset
);
1212 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1213 called for targets with only a generic address space. */
1216 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1217 tree from_type ATTRIBUTE_UNUSED
,
1218 tree to_type ATTRIBUTE_UNUSED
)
1224 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1229 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1232 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1233 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1239 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1240 tree
ARG_UNUSED (name
),
1241 tree
ARG_UNUSED (args
),
1242 int ARG_UNUSED (flags
))
1244 warning (OPT_Wattributes
,
1245 "target attribute is not supported on this machine");
1251 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1252 tree
ARG_UNUSED (pop_target
))
1254 warning (OPT_Wpragmas
,
1255 "#pragma GCC target is not supported for this machine");
1261 default_target_can_inline_p (tree caller
, tree callee
)
1264 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1265 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1267 /* If callee has no option attributes, then it is ok to inline */
1271 /* If caller has no option attributes, but callee does then it is not ok to
1273 else if (!caller_opts
)
1276 /* If both caller and callee have attributes, assume that if the
1277 pointer is different, the two functions have different target
1278 options since build_target_option_node uses a hash table for the
1281 ret
= (callee_opts
== caller_opts
);
1287 # define HAVE_casesi 0
1290 /* If the machine does not have a case insn that compares the bounds,
1291 this means extra overhead for dispatch tables, which raises the
1292 threshold for using them. */
1295 default_case_values_threshold (void)
1297 return (HAVE_casesi
? 4 : 5);
1301 default_have_conditional_execution (void)
1303 #ifdef HAVE_conditional_execution
1304 return HAVE_conditional_execution
;
1311 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1316 /* Compute cost of moving registers to/from memory. */
1319 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1320 reg_class_t rclass ATTRIBUTE_UNUSED
,
1321 bool in ATTRIBUTE_UNUSED
)
1323 #ifndef MEMORY_MOVE_COST
1324 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1326 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1330 /* Compute cost of moving data from a register of class FROM to one of
1334 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1335 reg_class_t from ATTRIBUTE_UNUSED
,
1336 reg_class_t to ATTRIBUTE_UNUSED
)
1338 #ifndef REGISTER_MOVE_COST
1341 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1346 default_profile_before_prologue (void)
1348 #ifdef PROFILE_BEFORE_PROLOGUE
1355 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1358 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1361 #ifdef PREFERRED_RELOAD_CLASS
1362 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1368 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1371 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1377 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1379 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1384 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1387 default_class_likely_spilled_p (reg_class_t rclass
)
1389 return (reg_class_size
[(int) rclass
] == 1);
1392 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1395 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1396 enum machine_mode mode ATTRIBUTE_UNUSED
)
1398 #ifdef CLASS_MAX_NREGS
1399 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1401 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1405 /* Determine the debugging unwind mechanism for the target. */
1407 enum unwind_info_type
1408 default_debug_unwind_info (void)
1410 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1411 /* ??? Change all users to the hook, then poison this. */
1412 #ifdef DWARF2_FRAME_INFO
1413 if (DWARF2_FRAME_INFO
)
1417 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1418 #ifdef DWARF2_DEBUGGING_INFO
1419 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1426 /* To be used by targets where reg_raw_mode doesn't return the right
1427 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1430 default_get_reg_raw_mode(int regno
)
1432 return reg_raw_mode
[regno
];
1435 /* Return true if the state of option OPTION should be stored in PCH files
1436 and checked by default_pch_valid_p. Store the option's current state
1440 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1442 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1444 if (option_flag_var (option
, &global_options
) == &target_flags
)
1445 if (targetm
.check_pch_target_flags
)
1447 return get_option_state (&global_options
, option
, state
);
1450 /* Default version of get_pch_validity.
1451 By default, every flag difference is fatal; that will be mostly right for
1452 most targets, but completely right for very few. */
1455 default_get_pch_validity (size_t *sz
)
1457 struct cl_option_state state
;
1462 if (targetm
.check_pch_target_flags
)
1463 *sz
+= sizeof (target_flags
);
1464 for (i
= 0; i
< cl_options_count
; i
++)
1465 if (option_affects_pch_p (i
, &state
))
1468 result
= r
= XNEWVEC (char, *sz
);
1472 if (targetm
.check_pch_target_flags
)
1474 memcpy (r
, &target_flags
, sizeof (target_flags
));
1475 r
+= sizeof (target_flags
);
1478 for (i
= 0; i
< cl_options_count
; i
++)
1479 if (option_affects_pch_p (i
, &state
))
1481 memcpy (r
, state
.data
, state
.size
);
1488 /* Return a message which says that a PCH file was created with a different
1489 setting of OPTION. */
1492 pch_option_mismatch (const char *option
)
1496 asprintf (&r
, _("created and used with differing settings of '%s'"), option
);
1498 return _("out of memory");
1502 /* Default version of pch_valid_p. */
1505 default_pch_valid_p (const void *data_p
, size_t len
)
1507 struct cl_option_state state
;
1508 const char *data
= (const char *)data_p
;
1511 /* -fpic and -fpie also usually make a PCH invalid. */
1512 if (data
[0] != flag_pic
)
1513 return _("created and used with different settings of -fpic");
1514 if (data
[1] != flag_pie
)
1515 return _("created and used with different settings of -fpie");
1518 /* Check target_flags. */
1519 if (targetm
.check_pch_target_flags
)
1524 memcpy (&tf
, data
, sizeof (target_flags
));
1525 data
+= sizeof (target_flags
);
1526 len
-= sizeof (target_flags
);
1527 r
= targetm
.check_pch_target_flags (tf
);
1532 for (i
= 0; i
< cl_options_count
; i
++)
1533 if (option_affects_pch_p (i
, &state
))
1535 if (memcmp (data
, state
.data
, state
.size
) != 0)
1536 return pch_option_mismatch (cl_options
[i
].opt_text
);
1544 /* Default version of cstore_mode. */
1547 default_cstore_mode (enum insn_code icode
)
1549 return insn_data
[(int) icode
].operand
[0].mode
;
1552 /* Default version of member_type_forces_blk. */
1555 default_member_type_forces_blk (const_tree
, enum machine_mode
)
1560 /* Default version of canonicalize_comparison. */
1563 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1567 #include "gt-targhooks.h"