1 /* Default target hook functions.
2 Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
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"
72 #include "tree-flow.h"
73 #include "tree-ssa-alias.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 if (GET_CODE (x
) == UNSPEC_VOLATILE
106 /* Any floating arithmetic may trap. */
107 || (SCALAR_FLOAT_MODE_P (GET_MODE (x
))
108 && flag_trapping_math
))
111 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
113 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
121 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
122 enum machine_mode mode
,
123 int *punsignedp ATTRIBUTE_UNUSED
,
124 const_tree funtype ATTRIBUTE_UNUSED
,
125 int for_return ATTRIBUTE_UNUSED
)
127 if (type
!= NULL_TREE
&& for_return
== 2)
128 return promote_mode (type
, mode
, punsignedp
);
133 default_promote_function_mode_always_promote (const_tree type
,
134 enum machine_mode mode
,
136 const_tree funtype ATTRIBUTE_UNUSED
,
137 int for_return ATTRIBUTE_UNUSED
)
139 return promote_mode (type
, mode
, punsignedp
);
144 default_cc_modes_compatible (enum machine_mode m1
, enum machine_mode m2
)
152 default_return_in_memory (const_tree type
,
153 const_tree fntype ATTRIBUTE_UNUSED
)
155 return (TYPE_MODE (type
) == BLKmode
);
159 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
160 enum machine_mode mode ATTRIBUTE_UNUSED
)
166 default_expand_builtin_saveregs (void)
168 error ("__builtin_saveregs not supported by this target");
173 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED
,
174 enum machine_mode mode ATTRIBUTE_UNUSED
,
175 tree type ATTRIBUTE_UNUSED
,
176 int *pretend_arg_size ATTRIBUTE_UNUSED
,
177 int second_time ATTRIBUTE_UNUSED
)
181 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
184 default_builtin_setjmp_frame_value (void)
186 return virtual_stack_vars_rtx
;
189 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
192 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
198 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
200 return (targetm
.calls
.setup_incoming_varargs
201 != default_setup_incoming_varargs
);
205 default_eh_return_filter_mode (void)
207 return targetm
.unwind_word_mode ();
211 default_libgcc_cmp_return_mode (void)
217 default_libgcc_shift_count_mode (void)
223 default_unwind_word_mode (void)
228 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
230 unsigned HOST_WIDE_INT
231 default_shift_truncation_mask (enum machine_mode mode
)
233 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
236 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
239 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED
)
241 return have_insn_for (DIV
, mode
) ? 3 : 2;
244 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
247 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED
,
248 enum machine_mode mode_rep ATTRIBUTE_UNUSED
)
253 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
256 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
261 /* Return machine mode for non-standard suffix
262 or VOIDmode if non-standard suffixes are unsupported. */
264 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
269 /* The generic C++ ABI specifies this is a 64-bit value. */
271 default_cxx_guard_type (void)
273 return long_long_integer_type_node
;
277 /* Returns the size of the cookie to use when allocating an array
278 whose elements have the indicated TYPE. Assumes that it is already
279 known that a cookie is needed. */
282 default_cxx_get_cookie_size (tree type
)
286 /* We need to allocate an additional max (sizeof (size_t), alignof
287 (true_type)) bytes. */
291 sizetype_size
= size_in_bytes (sizetype
);
292 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
293 if (INT_CST_LT_UNSIGNED (type_align
, sizetype_size
))
294 cookie_size
= sizetype_size
;
296 cookie_size
= type_align
;
301 /* Return true if a parameter must be passed by reference. This version
302 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
305 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED
,
306 enum machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
307 bool named_arg ATTRIBUTE_UNUSED
)
309 return targetm
.calls
.must_pass_in_stack (mode
, type
);
312 /* Return true if a parameter follows callee copies conventions. This
313 version of the hook is true for all named arguments. */
316 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED
,
317 enum machine_mode mode ATTRIBUTE_UNUSED
,
318 const_tree type ATTRIBUTE_UNUSED
, bool named
)
323 /* Emit to STREAM the assembler syntax for insn operand X. */
326 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
327 int code ATTRIBUTE_UNUSED
)
330 PRINT_OPERAND (stream
, x
, code
);
336 /* Emit to STREAM the assembler syntax for an insn operand whose memory
340 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
341 rtx x ATTRIBUTE_UNUSED
)
343 #ifdef PRINT_OPERAND_ADDRESS
344 PRINT_OPERAND_ADDRESS (stream
, x
);
350 /* Return true if CODE is a valid punctuation character for the
351 `print_operand' hook. */
354 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
356 #ifdef PRINT_OPERAND_PUNCT_VALID_P
357 return PRINT_OPERAND_PUNCT_VALID_P (code
);
363 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
365 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
367 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
368 const char *stripped
= targetm
.strip_name_encoding (skipped
);
369 if (*name
!= '*' && user_label_prefix
[0])
370 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
371 return get_identifier (stripped
);
374 /* True if MODE is valid for the target. By "valid", we mean able to
375 be manipulated in non-trivial ways. In particular, this means all
376 the arithmetic is supported.
378 By default we guess this means that any C type is supported. If
379 we can't map the mode back to a type that would be available in C,
380 then reject it. Special case, here, is the double-word arithmetic
381 supported by optabs.c. */
384 default_scalar_mode_supported_p (enum machine_mode mode
)
386 int precision
= GET_MODE_PRECISION (mode
);
388 switch (GET_MODE_CLASS (mode
))
390 case MODE_PARTIAL_INT
:
392 if (precision
== CHAR_TYPE_SIZE
)
394 if (precision
== SHORT_TYPE_SIZE
)
396 if (precision
== INT_TYPE_SIZE
)
398 if (precision
== LONG_TYPE_SIZE
)
400 if (precision
== LONG_LONG_TYPE_SIZE
)
402 if (precision
== 2 * BITS_PER_WORD
)
407 if (precision
== FLOAT_TYPE_SIZE
)
409 if (precision
== DOUBLE_TYPE_SIZE
)
411 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
415 case MODE_DECIMAL_FLOAT
:
427 /* Make some target macros useable by target-independent code. */
429 targhook_words_big_endian (void)
431 return !!WORDS_BIG_ENDIAN
;
435 targhook_float_words_big_endian (void)
437 return !!FLOAT_WORDS_BIG_ENDIAN
;
440 /* True if the target supports decimal floating point. */
443 default_decimal_float_supported_p (void)
445 return ENABLE_DECIMAL_FLOAT
;
448 /* True if the target supports fixed-point arithmetic. */
451 default_fixed_point_supported_p (void)
453 return ENABLE_FIXED_POINT
;
456 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
459 This function checks whether a given INSN is valid within a low-overhead
460 loop. If INSN is invalid it returns the reason for that, otherwise it
461 returns NULL. A called function may clobber any special registers required
462 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
463 register for branch on table instructions. We reject the doloop pattern in
467 default_invalid_within_doloop (const_rtx insn
)
470 return "Function call in loop.";
472 if (JUMP_TABLE_DATA_P (insn
))
473 return "Computed branch in the loop.";
478 /* Mapping of builtin functions to vectorized variants. */
481 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
482 tree type_out ATTRIBUTE_UNUSED
,
483 tree type_in ATTRIBUTE_UNUSED
)
488 /* Vectorized conversion. */
491 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
492 tree dest_type ATTRIBUTE_UNUSED
,
493 tree src_type ATTRIBUTE_UNUSED
)
498 /* Default vectorizer cost model values. */
501 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
503 int misalign ATTRIBUTE_UNUSED
)
507 switch (type_of_cost
)
517 case cond_branch_not_taken
:
519 case vec_promote_demote
:
523 case unaligned_store
:
526 case cond_branch_taken
:
530 elements
= TYPE_VECTOR_SUBPARTS (vectype
);
531 return elements
/ 2 + 1;
541 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
542 bool md_fn ATTRIBUTE_UNUSED
,
543 bool sqrt ATTRIBUTE_UNUSED
)
549 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
550 cumulative_args_t ca ATTRIBUTE_UNUSED
,
551 enum machine_mode mode ATTRIBUTE_UNUSED
,
552 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
558 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
559 cumulative_args_t ca ATTRIBUTE_UNUSED
,
560 enum machine_mode mode ATTRIBUTE_UNUSED
,
561 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
567 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
568 cumulative_args_t ca ATTRIBUTE_UNUSED
,
569 enum machine_mode mode ATTRIBUTE_UNUSED
,
570 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
576 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
577 enum machine_mode mode ATTRIBUTE_UNUSED
,
578 const_tree type ATTRIBUTE_UNUSED
,
579 bool named ATTRIBUTE_UNUSED
)
585 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
586 enum machine_mode mode ATTRIBUTE_UNUSED
,
587 const_tree type ATTRIBUTE_UNUSED
,
588 bool named ATTRIBUTE_UNUSED
)
594 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
595 enum machine_mode mode ATTRIBUTE_UNUSED
,
596 const_tree type ATTRIBUTE_UNUSED
,
597 bool named ATTRIBUTE_UNUSED
)
603 default_function_arg_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
604 const_tree type ATTRIBUTE_UNUSED
)
606 return PARM_BOUNDARY
;
610 default_function_arg_round_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
611 const_tree type ATTRIBUTE_UNUSED
)
613 return PARM_BOUNDARY
;
617 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
622 hook_invalid_arg_for_unprototyped_fn (
623 const_tree typelist ATTRIBUTE_UNUSED
,
624 const_tree funcdecl ATTRIBUTE_UNUSED
,
625 const_tree val ATTRIBUTE_UNUSED
)
630 /* Initialize the stack protection decls. */
632 /* Stack protection related decls living in libgcc. */
633 static GTY(()) tree stack_chk_guard_decl
;
636 default_stack_protect_guard (void)
638 tree t
= stack_chk_guard_decl
;
644 t
= build_decl (UNKNOWN_LOCATION
,
645 VAR_DECL
, get_identifier ("__stack_chk_guard"),
649 DECL_EXTERNAL (t
) = 1;
651 TREE_THIS_VOLATILE (t
) = 1;
652 DECL_ARTIFICIAL (t
) = 1;
653 DECL_IGNORED_P (t
) = 1;
655 /* Do not share RTL as the declaration is visible outside of
658 RTX_FLAG (x
, used
) = 1;
660 stack_chk_guard_decl
= t
;
666 static GTY(()) tree stack_chk_fail_decl
;
669 default_external_stack_protect_fail (void)
671 tree t
= stack_chk_fail_decl
;
675 t
= build_function_type_list (void_type_node
, NULL_TREE
);
676 t
= build_decl (UNKNOWN_LOCATION
,
677 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
680 DECL_EXTERNAL (t
) = 1;
682 TREE_THIS_VOLATILE (t
) = 1;
683 TREE_NOTHROW (t
) = 1;
684 DECL_ARTIFICIAL (t
) = 1;
685 DECL_IGNORED_P (t
) = 1;
686 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
687 DECL_VISIBILITY_SPECIFIED (t
) = 1;
689 stack_chk_fail_decl
= t
;
692 return build_call_expr (t
, 0);
696 default_hidden_stack_protect_fail (void)
698 #ifndef HAVE_GAS_HIDDEN
699 return default_external_stack_protect_fail ();
701 tree t
= stack_chk_fail_decl
;
704 return default_external_stack_protect_fail ();
708 t
= build_function_type_list (void_type_node
, NULL_TREE
);
709 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
710 get_identifier ("__stack_chk_fail_local"), t
);
713 DECL_EXTERNAL (t
) = 1;
715 TREE_THIS_VOLATILE (t
) = 1;
716 TREE_NOTHROW (t
) = 1;
717 DECL_ARTIFICIAL (t
) = 1;
718 DECL_IGNORED_P (t
) = 1;
719 DECL_VISIBILITY_SPECIFIED (t
) = 1;
720 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
722 stack_chk_fail_decl
= t
;
725 return build_call_expr (t
, 0);
730 hook_bool_const_rtx_commutative_p (const_rtx x
,
731 int outer_code ATTRIBUTE_UNUSED
)
733 return COMMUTATIVE_P (x
);
737 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
738 const_tree fn_decl_or_type
,
739 bool outgoing ATTRIBUTE_UNUSED
)
741 /* The old interface doesn't handle receiving the function type. */
743 && !DECL_P (fn_decl_or_type
))
744 fn_decl_or_type
= NULL
;
746 #ifdef FUNCTION_VALUE
747 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
754 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED
,
755 const_rtx fun ATTRIBUTE_UNUSED
)
758 return LIBCALL_VALUE (mode
);
764 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
767 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
769 #ifdef FUNCTION_VALUE_REGNO_P
770 return FUNCTION_VALUE_REGNO_P (regno
);
777 default_internal_arg_pointer (void)
779 /* If the reg that the virtual arg pointer will be translated into is
780 not a fixed reg or is the stack pointer, make a copy of the virtual
781 arg pointer, and address parms via the copy. The frame pointer is
782 considered fixed even though it is not marked as such. */
783 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
784 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
785 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
786 return copy_to_reg (virtual_incoming_args_rtx
);
788 return virtual_incoming_args_rtx
;
792 default_static_chain (const_tree fndecl
, bool incoming_p
)
794 if (!DECL_STATIC_CHAIN (fndecl
))
799 #ifdef STATIC_CHAIN_INCOMING_REGNUM
800 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
804 #ifdef STATIC_CHAIN_REGNUM
805 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
809 static bool issued_error
;
813 sorry ("nested functions not supported on this target");
816 /* It really doesn't matter what we return here, so long at it
817 doesn't cause the rest of the compiler to crash. */
818 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
823 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
824 rtx
ARG_UNUSED (r_chain
))
826 sorry ("nested function trampolines not supported on this target");
830 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
831 tree funtype ATTRIBUTE_UNUSED
,
832 int size ATTRIBUTE_UNUSED
)
838 default_branch_target_register_class (void)
850 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
856 default_different_addr_displacement_p (void)
862 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
863 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
864 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
865 secondary_reload_info
*sri
)
867 enum reg_class rclass
= NO_REGS
;
868 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
870 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
872 sri
->icode
= sri
->prev_sri
->t_icode
;
875 #ifdef SECONDARY_INPUT_RELOAD_CLASS
877 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
879 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
881 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
883 if (rclass
!= NO_REGS
)
886 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
889 if (icode
!= CODE_FOR_nothing
890 && !insn_operand_matches (icode
, in_p
, x
))
891 icode
= CODE_FOR_nothing
;
892 else if (icode
!= CODE_FOR_nothing
)
894 const char *insn_constraint
, *scratch_constraint
;
895 char insn_letter
, scratch_letter
;
896 enum reg_class insn_class
, scratch_class
;
898 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
899 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
900 if (!*insn_constraint
)
901 insn_class
= ALL_REGS
;
906 gcc_assert (*insn_constraint
== '=');
909 insn_letter
= *insn_constraint
;
911 = (insn_letter
== 'r' ? GENERAL_REGS
912 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
914 gcc_assert (insn_class
!= NO_REGS
);
917 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
918 /* The scratch register's constraint must start with "=&",
919 except for an input reload, where only "=" is necessary,
920 and where it might be beneficial to re-use registers from
922 gcc_assert (scratch_constraint
[0] == '='
923 && (in_p
|| scratch_constraint
[1] == '&'));
924 scratch_constraint
++;
925 if (*scratch_constraint
== '&')
926 scratch_constraint
++;
927 scratch_letter
= *scratch_constraint
;
929 = (scratch_letter
== 'r' ? GENERAL_REGS
930 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
931 scratch_constraint
));
933 if (reg_class_subset_p (reload_class
, insn_class
))
935 gcc_assert (scratch_class
== rclass
);
942 if (rclass
== NO_REGS
)
945 sri
->t_icode
= icode
;
950 /* By default, if flag_pic is true, then neither local nor global relocs
951 should be placed in readonly memory. */
954 default_reloc_rw_mask (void)
956 return flag_pic
? 3 : 0;
959 /* By default, do no modification. */
960 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
966 /* Default to natural alignment for vector types. */
968 default_vector_alignment (const_tree type
)
970 return tree_low_cst (TYPE_SIZE (type
), 0);
974 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
979 /* Assuming that types whose size is > pointer-size are not guaranteed to be
980 naturally aligned. */
981 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
984 /* Assuming that types whose size is <= pointer-size
985 are naturally aligned. */
989 /* By default, assume that a target supports any factor of misalignment
990 memory access if it supports movmisalign patten.
991 is_packed is true if the memory access is defined in a packed struct. */
993 default_builtin_support_vector_misalignment (enum machine_mode mode
,
1001 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1006 /* By default, only attempt to parallelize bitwise operations, and
1007 possibly adds/subtracts using bit-twiddling. */
1010 default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED
)
1015 /* By default only the size derived from the preferred vector mode
1019 default_autovectorize_vector_sizes (void)
1024 /* By default, the cost model accumulates three separate costs (prologue,
1025 loop body, and epilogue) for a vectorized loop or block. So allocate an
1026 array of three unsigned ints, set it to zero, and return its address. */
1029 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1031 unsigned *cost
= XNEWVEC (unsigned, 3);
1032 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1036 /* By default, the cost model looks up the cost of the given statement
1037 kind and mode, multiplies it by the occurrence count, accumulates
1038 it into the cost specified by WHERE, and returns the cost added. */
1041 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1042 struct _stmt_vec_info
*stmt_info
, int misalign
,
1043 enum vect_cost_model_location where
)
1045 unsigned *cost
= (unsigned *) data
;
1046 unsigned retval
= 0;
1048 if (flag_vect_cost_model
)
1050 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1051 int stmt_cost
= default_builtin_vectorization_cost (kind
, vectype
,
1053 /* Statements in an inner loop relative to the loop being
1054 vectorized are weighted more heavily. The value here is
1055 arbitrary and could potentially be improved with analysis. */
1056 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1057 count
*= 50; /* FIXME. */
1059 retval
= (unsigned) (count
* stmt_cost
);
1060 cost
[where
] += retval
;
1066 /* By default, the cost model just returns the accumulated costs. */
1069 default_finish_cost (void *data
, unsigned *prologue_cost
,
1070 unsigned *body_cost
, unsigned *epilogue_cost
)
1072 unsigned *cost
= (unsigned *) data
;
1073 *prologue_cost
= cost
[vect_prologue
];
1074 *body_cost
= cost
[vect_body
];
1075 *epilogue_cost
= cost
[vect_epilogue
];
1078 /* Free the cost data. */
1081 default_destroy_cost_data (void *data
)
1086 /* Determine whether or not a pointer mode is valid. Assume defaults
1087 of ptr_mode or Pmode - can be overridden. */
1089 default_valid_pointer_mode (enum machine_mode mode
)
1091 return (mode
== ptr_mode
|| mode
== Pmode
);
1094 /* Determine whether the memory reference specified by REF may alias
1095 the C libraries errno location. */
1097 default_ref_may_alias_errno (ao_ref
*ref
)
1099 tree base
= ao_ref_base (ref
);
1100 /* The default implementation assumes the errno location is
1101 a declaration of type int or is always accessed via a
1102 pointer to int. We assume that accesses to errno are
1103 not deliberately obfuscated (even in conforming ways). */
1104 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1105 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1107 /* The default implementation assumes an errno location
1108 declaration is never defined in the current compilation unit. */
1110 && !TREE_STATIC (base
))
1112 else if (TREE_CODE (base
) == MEM_REF
1113 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1115 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1116 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1121 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1122 for the generic address space only. */
1125 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1127 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1131 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1132 for the generic address space only. */
1135 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1137 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1141 /* Named address space version of valid_pointer_mode. */
1144 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
1146 if (!ADDR_SPACE_GENERIC_P (as
))
1147 return (mode
== targetm
.addr_space
.pointer_mode (as
)
1148 || mode
== targetm
.addr_space
.address_mode (as
));
1150 return targetm
.valid_pointer_mode (mode
);
1153 /* Some places still assume that all pointer or address modes are the
1154 standard Pmode and ptr_mode. These optimizations become invalid if
1155 the target actually supports multiple different modes. For now,
1156 we disable such optimizations on such targets, using this function. */
1159 target_default_pointer_address_modes_p (void)
1161 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1163 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1169 /* Named address space version of legitimate_address_p. */
1172 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
1173 bool strict
, addr_space_t as
)
1175 if (!ADDR_SPACE_GENERIC_P (as
))
1178 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1181 /* Named address space version of LEGITIMIZE_ADDRESS. */
1184 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
1185 enum machine_mode mode
, addr_space_t as
)
1187 if (!ADDR_SPACE_GENERIC_P (as
))
1190 return targetm
.legitimize_address (x
, oldx
, mode
);
1193 /* The default hook for determining if one named address space is a subset of
1194 another and to return which address space to use as the common address
1198 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1200 return (subset
== superset
);
1203 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1204 called for targets with only a generic address space. */
1207 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1208 tree from_type ATTRIBUTE_UNUSED
,
1209 tree to_type ATTRIBUTE_UNUSED
)
1215 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1220 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1223 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1224 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1230 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1231 tree
ARG_UNUSED (name
),
1232 tree
ARG_UNUSED (args
),
1233 int ARG_UNUSED (flags
))
1235 warning (OPT_Wattributes
,
1236 "target attribute is not supported on this machine");
1242 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1243 tree
ARG_UNUSED (pop_target
))
1245 warning (OPT_Wpragmas
,
1246 "#pragma GCC target is not supported for this machine");
1252 default_target_can_inline_p (tree caller
, tree callee
)
1255 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1256 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1258 /* If callee has no option attributes, then it is ok to inline */
1262 /* If caller has no option attributes, but callee does then it is not ok to
1264 else if (!caller_opts
)
1267 /* If both caller and callee have attributes, assume that if the
1268 pointer is different, the two functions have different target
1269 options since build_target_option_node uses a hash table for the
1272 ret
= (callee_opts
== caller_opts
);
1278 # define HAVE_casesi 0
1281 /* If the machine does not have a case insn that compares the bounds,
1282 this means extra overhead for dispatch tables, which raises the
1283 threshold for using them. */
1286 default_case_values_threshold (void)
1288 return (HAVE_casesi
? 4 : 5);
1292 default_have_conditional_execution (void)
1294 #ifdef HAVE_conditional_execution
1295 return HAVE_conditional_execution
;
1302 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1307 /* Compute cost of moving registers to/from memory. */
1310 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1311 reg_class_t rclass ATTRIBUTE_UNUSED
,
1312 bool in ATTRIBUTE_UNUSED
)
1314 #ifndef MEMORY_MOVE_COST
1315 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1317 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1321 /* Compute cost of moving data from a register of class FROM to one of
1325 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1326 reg_class_t from ATTRIBUTE_UNUSED
,
1327 reg_class_t to ATTRIBUTE_UNUSED
)
1329 #ifndef REGISTER_MOVE_COST
1332 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1337 default_profile_before_prologue (void)
1339 #ifdef PROFILE_BEFORE_PROLOGUE
1346 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1349 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1352 #ifdef PREFERRED_RELOAD_CLASS
1353 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1359 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1362 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1368 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1370 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1375 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1378 default_class_likely_spilled_p (reg_class_t rclass
)
1380 return (reg_class_size
[(int) rclass
] == 1);
1383 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1386 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1387 enum machine_mode mode ATTRIBUTE_UNUSED
)
1389 #ifdef CLASS_MAX_NREGS
1390 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1392 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1396 /* Determine the debugging unwind mechanism for the target. */
1398 enum unwind_info_type
1399 default_debug_unwind_info (void)
1401 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1402 /* ??? Change all users to the hook, then poison this. */
1403 #ifdef DWARF2_FRAME_INFO
1404 if (DWARF2_FRAME_INFO
)
1408 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1409 #ifdef DWARF2_DEBUGGING_INFO
1410 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1417 /* To be used by targets where reg_raw_mode doesn't return the right
1418 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1421 default_get_reg_raw_mode(int regno
)
1423 return reg_raw_mode
[regno
];
1426 /* Return true if the state of option OPTION should be stored in PCH files
1427 and checked by default_pch_valid_p. Store the option's current state
1431 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1433 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1435 if (option_flag_var (option
, &global_options
) == &target_flags
)
1436 if (targetm
.check_pch_target_flags
)
1438 return get_option_state (&global_options
, option
, state
);
1441 /* Default version of get_pch_validity.
1442 By default, every flag difference is fatal; that will be mostly right for
1443 most targets, but completely right for very few. */
1446 default_get_pch_validity (size_t *sz
)
1448 struct cl_option_state state
;
1453 if (targetm
.check_pch_target_flags
)
1454 *sz
+= sizeof (target_flags
);
1455 for (i
= 0; i
< cl_options_count
; i
++)
1456 if (option_affects_pch_p (i
, &state
))
1459 result
= r
= XNEWVEC (char, *sz
);
1463 if (targetm
.check_pch_target_flags
)
1465 memcpy (r
, &target_flags
, sizeof (target_flags
));
1466 r
+= sizeof (target_flags
);
1469 for (i
= 0; i
< cl_options_count
; i
++)
1470 if (option_affects_pch_p (i
, &state
))
1472 memcpy (r
, state
.data
, state
.size
);
1479 /* Return a message which says that a PCH file was created with a different
1480 setting of OPTION. */
1483 pch_option_mismatch (const char *option
)
1487 asprintf (&r
, _("created and used with differing settings of '%s'"), option
);
1489 return _("out of memory");
1493 /* Default version of pch_valid_p. */
1496 default_pch_valid_p (const void *data_p
, size_t len
)
1498 struct cl_option_state state
;
1499 const char *data
= (const char *)data_p
;
1502 /* -fpic and -fpie also usually make a PCH invalid. */
1503 if (data
[0] != flag_pic
)
1504 return _("created and used with different settings of -fpic");
1505 if (data
[1] != flag_pie
)
1506 return _("created and used with different settings of -fpie");
1509 /* Check target_flags. */
1510 if (targetm
.check_pch_target_flags
)
1515 memcpy (&tf
, data
, sizeof (target_flags
));
1516 data
+= sizeof (target_flags
);
1517 len
-= sizeof (target_flags
);
1518 r
= targetm
.check_pch_target_flags (tf
);
1523 for (i
= 0; i
< cl_options_count
; i
++)
1524 if (option_affects_pch_p (i
, &state
))
1526 if (memcmp (data
, state
.data
, state
.size
) != 0)
1527 return pch_option_mismatch (cl_options
[i
].opt_text
);
1535 /* Default version of member_type_forces_blk. */
1538 default_member_type_forces_blk (const_tree
, enum machine_mode
)
1543 /* Default version of canonicalize_comparison. */
1546 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1550 #include "gt-targhooks.h"