1 /* Default target hook functions.
2 Copyright (C) 2003-2014 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"
56 #include "stor-layout.h"
60 #include "diagnostic-core.h"
64 #include "target-def.h"
65 #include "hard-reg-set.h"
72 #include "tree-ssa-alias.h"
73 #include "gimple-expr.h"
75 #include "stringpool.h"
76 #include "tree-ssanames.h"
77 #include "insn-codes.h"
81 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED
,
82 rtx addr ATTRIBUTE_UNUSED
,
83 bool strict ATTRIBUTE_UNUSED
)
85 #ifdef GO_IF_LEGITIMATE_ADDRESS
86 /* Defer to the old implementation using a goto. */
88 return strict_memory_address_p (mode
, addr
);
90 return memory_address_p (mode
, addr
);
97 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
99 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
100 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
105 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
109 /* Any floating arithmetic may trap. */
110 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
113 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
115 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
123 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
124 enum machine_mode mode
,
125 int *punsignedp ATTRIBUTE_UNUSED
,
126 const_tree funtype ATTRIBUTE_UNUSED
,
127 int for_return ATTRIBUTE_UNUSED
)
129 if (type
!= NULL_TREE
&& for_return
== 2)
130 return promote_mode (type
, mode
, punsignedp
);
135 default_promote_function_mode_always_promote (const_tree type
,
136 enum machine_mode mode
,
138 const_tree funtype ATTRIBUTE_UNUSED
,
139 int for_return ATTRIBUTE_UNUSED
)
141 return promote_mode (type
, mode
, punsignedp
);
145 default_cc_modes_compatible (enum machine_mode m1
, enum machine_mode m2
)
153 default_return_in_memory (const_tree type
,
154 const_tree fntype ATTRIBUTE_UNUSED
)
156 return (TYPE_MODE (type
) == BLKmode
);
160 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
161 enum machine_mode mode ATTRIBUTE_UNUSED
)
167 default_expand_builtin_saveregs (void)
169 error ("__builtin_saveregs not supported by this target");
174 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED
,
175 enum machine_mode mode ATTRIBUTE_UNUSED
,
176 tree type ATTRIBUTE_UNUSED
,
177 int *pretend_arg_size ATTRIBUTE_UNUSED
,
178 int second_time ATTRIBUTE_UNUSED
)
182 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
185 default_builtin_setjmp_frame_value (void)
187 return virtual_stack_vars_rtx
;
190 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
193 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
199 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
201 return (targetm
.calls
.setup_incoming_varargs
202 != default_setup_incoming_varargs
);
206 default_eh_return_filter_mode (void)
208 return targetm
.unwind_word_mode ();
212 default_libgcc_cmp_return_mode (void)
218 default_libgcc_shift_count_mode (void)
224 default_unwind_word_mode (void)
229 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
231 unsigned HOST_WIDE_INT
232 default_shift_truncation_mask (enum machine_mode mode
)
234 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
237 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
240 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED
)
242 return have_insn_for (DIV
, mode
) ? 3 : 2;
245 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
248 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED
,
249 enum machine_mode mode_rep ATTRIBUTE_UNUSED
)
254 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
257 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
262 /* Return machine mode for non-standard suffix
263 or VOIDmode if non-standard suffixes are unsupported. */
265 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
270 /* The generic C++ ABI specifies this is a 64-bit value. */
272 default_cxx_guard_type (void)
274 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 floating-point exceptions and rounding
444 default_float_exceptions_rounding_supported_p (void)
453 /* True if the target supports decimal floating point. */
456 default_decimal_float_supported_p (void)
458 return ENABLE_DECIMAL_FLOAT
;
461 /* True if the target supports fixed-point arithmetic. */
464 default_fixed_point_supported_p (void)
466 return ENABLE_FIXED_POINT
;
469 /* True if the target supports GNU indirect functions. */
472 default_has_ifunc_p (void)
474 return HAVE_GNU_INDIRECT_FUNCTION
;
477 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
480 This function checks whether a given INSN is valid within a low-overhead
481 loop. If INSN is invalid it returns the reason for that, otherwise it
482 returns NULL. A called function may clobber any special registers required
483 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
484 register for branch on table instructions. We reject the doloop pattern in
488 default_invalid_within_doloop (const_rtx insn
)
491 return "Function call in loop.";
493 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
494 return "Computed branch in the loop.";
499 /* Mapping of builtin functions to vectorized variants. */
502 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
503 tree type_out ATTRIBUTE_UNUSED
,
504 tree type_in ATTRIBUTE_UNUSED
)
509 /* Vectorized conversion. */
512 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
513 tree dest_type ATTRIBUTE_UNUSED
,
514 tree src_type ATTRIBUTE_UNUSED
)
519 /* Default vectorizer cost model values. */
522 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
524 int misalign ATTRIBUTE_UNUSED
)
528 switch (type_of_cost
)
538 case cond_branch_not_taken
:
540 case vec_promote_demote
:
544 case unaligned_store
:
547 case cond_branch_taken
:
551 elements
= TYPE_VECTOR_SUBPARTS (vectype
);
552 return elements
/ 2 + 1;
562 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
563 bool md_fn ATTRIBUTE_UNUSED
,
564 bool sqrt ATTRIBUTE_UNUSED
)
570 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
571 cumulative_args_t ca ATTRIBUTE_UNUSED
,
572 enum machine_mode mode ATTRIBUTE_UNUSED
,
573 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
579 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
580 cumulative_args_t ca ATTRIBUTE_UNUSED
,
581 enum machine_mode mode ATTRIBUTE_UNUSED
,
582 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
588 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
589 cumulative_args_t ca ATTRIBUTE_UNUSED
,
590 enum machine_mode mode ATTRIBUTE_UNUSED
,
591 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
597 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
598 enum machine_mode mode ATTRIBUTE_UNUSED
,
599 const_tree type ATTRIBUTE_UNUSED
,
600 bool named ATTRIBUTE_UNUSED
)
606 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
607 enum machine_mode mode ATTRIBUTE_UNUSED
,
608 const_tree type ATTRIBUTE_UNUSED
,
609 bool named ATTRIBUTE_UNUSED
)
615 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
616 enum machine_mode mode ATTRIBUTE_UNUSED
,
617 const_tree type ATTRIBUTE_UNUSED
,
618 bool named ATTRIBUTE_UNUSED
)
624 default_function_arg_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
625 const_tree type ATTRIBUTE_UNUSED
)
627 return PARM_BOUNDARY
;
631 default_function_arg_round_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
632 const_tree type ATTRIBUTE_UNUSED
)
634 return PARM_BOUNDARY
;
638 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
643 hook_invalid_arg_for_unprototyped_fn (
644 const_tree typelist ATTRIBUTE_UNUSED
,
645 const_tree funcdecl ATTRIBUTE_UNUSED
,
646 const_tree val ATTRIBUTE_UNUSED
)
651 /* Initialize the stack protection decls. */
653 /* Stack protection related decls living in libgcc. */
654 static GTY(()) tree stack_chk_guard_decl
;
657 default_stack_protect_guard (void)
659 tree t
= stack_chk_guard_decl
;
665 t
= build_decl (UNKNOWN_LOCATION
,
666 VAR_DECL
, get_identifier ("__stack_chk_guard"),
670 DECL_EXTERNAL (t
) = 1;
672 TREE_THIS_VOLATILE (t
) = 1;
673 DECL_ARTIFICIAL (t
) = 1;
674 DECL_IGNORED_P (t
) = 1;
676 /* Do not share RTL as the declaration is visible outside of
679 RTX_FLAG (x
, used
) = 1;
681 stack_chk_guard_decl
= t
;
687 static GTY(()) tree stack_chk_fail_decl
;
690 default_external_stack_protect_fail (void)
692 tree t
= stack_chk_fail_decl
;
696 t
= build_function_type_list (void_type_node
, NULL_TREE
);
697 t
= build_decl (UNKNOWN_LOCATION
,
698 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
701 DECL_EXTERNAL (t
) = 1;
703 TREE_THIS_VOLATILE (t
) = 1;
704 TREE_NOTHROW (t
) = 1;
705 DECL_ARTIFICIAL (t
) = 1;
706 DECL_IGNORED_P (t
) = 1;
707 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
708 DECL_VISIBILITY_SPECIFIED (t
) = 1;
710 stack_chk_fail_decl
= t
;
713 return build_call_expr (t
, 0);
717 default_hidden_stack_protect_fail (void)
719 #ifndef HAVE_GAS_HIDDEN
720 return default_external_stack_protect_fail ();
722 tree t
= stack_chk_fail_decl
;
725 return default_external_stack_protect_fail ();
729 t
= build_function_type_list (void_type_node
, NULL_TREE
);
730 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
731 get_identifier ("__stack_chk_fail_local"), t
);
734 DECL_EXTERNAL (t
) = 1;
736 TREE_THIS_VOLATILE (t
) = 1;
737 TREE_NOTHROW (t
) = 1;
738 DECL_ARTIFICIAL (t
) = 1;
739 DECL_IGNORED_P (t
) = 1;
740 DECL_VISIBILITY_SPECIFIED (t
) = 1;
741 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
743 stack_chk_fail_decl
= t
;
746 return build_call_expr (t
, 0);
751 hook_bool_const_rtx_commutative_p (const_rtx x
,
752 int outer_code ATTRIBUTE_UNUSED
)
754 return COMMUTATIVE_P (x
);
758 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
759 const_tree fn_decl_or_type
,
760 bool outgoing ATTRIBUTE_UNUSED
)
762 /* The old interface doesn't handle receiving the function type. */
764 && !DECL_P (fn_decl_or_type
))
765 fn_decl_or_type
= NULL
;
767 #ifdef FUNCTION_VALUE
768 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
775 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED
,
776 const_rtx fun ATTRIBUTE_UNUSED
)
779 return LIBCALL_VALUE (mode
);
785 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
788 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
790 #ifdef FUNCTION_VALUE_REGNO_P
791 return FUNCTION_VALUE_REGNO_P (regno
);
798 default_internal_arg_pointer (void)
800 /* If the reg that the virtual arg pointer will be translated into is
801 not a fixed reg or is the stack pointer, make a copy of the virtual
802 arg pointer, and address parms via the copy. The frame pointer is
803 considered fixed even though it is not marked as such. */
804 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
805 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
806 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
807 return copy_to_reg (virtual_incoming_args_rtx
);
809 return virtual_incoming_args_rtx
;
813 default_static_chain (const_tree fndecl
, bool incoming_p
)
815 if (!DECL_STATIC_CHAIN (fndecl
))
820 #ifdef STATIC_CHAIN_INCOMING_REGNUM
821 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
825 #ifdef STATIC_CHAIN_REGNUM
826 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
830 static bool issued_error
;
834 sorry ("nested functions not supported on this target");
837 /* It really doesn't matter what we return here, so long at it
838 doesn't cause the rest of the compiler to crash. */
839 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
844 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
845 rtx
ARG_UNUSED (r_chain
))
847 sorry ("nested function trampolines not supported on this target");
851 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
852 tree funtype ATTRIBUTE_UNUSED
,
853 int size ATTRIBUTE_UNUSED
)
859 default_branch_target_register_class (void)
871 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
877 default_register_usage_leveling_p (void)
883 default_different_addr_displacement_p (void)
889 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
890 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
891 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
892 secondary_reload_info
*sri
)
894 enum reg_class rclass
= NO_REGS
;
895 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
897 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
899 sri
->icode
= sri
->prev_sri
->t_icode
;
902 #ifdef SECONDARY_INPUT_RELOAD_CLASS
904 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
906 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
908 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
910 if (rclass
!= NO_REGS
)
913 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
916 if (icode
!= CODE_FOR_nothing
917 && !insn_operand_matches (icode
, in_p
, x
))
918 icode
= CODE_FOR_nothing
;
919 else if (icode
!= CODE_FOR_nothing
)
921 const char *insn_constraint
, *scratch_constraint
;
922 char insn_letter
, scratch_letter
;
923 enum reg_class insn_class
, scratch_class
;
925 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
926 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
927 if (!*insn_constraint
)
928 insn_class
= ALL_REGS
;
933 gcc_assert (*insn_constraint
== '=');
936 insn_letter
= *insn_constraint
;
938 = (insn_letter
== 'r' ? GENERAL_REGS
939 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
941 gcc_assert (insn_class
!= NO_REGS
);
944 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
945 /* The scratch register's constraint must start with "=&",
946 except for an input reload, where only "=" is necessary,
947 and where it might be beneficial to re-use registers from
949 gcc_assert (scratch_constraint
[0] == '='
950 && (in_p
|| scratch_constraint
[1] == '&'));
951 scratch_constraint
++;
952 if (*scratch_constraint
== '&')
953 scratch_constraint
++;
954 scratch_letter
= *scratch_constraint
;
956 = (scratch_letter
== 'r' ? GENERAL_REGS
957 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
958 scratch_constraint
));
960 if (reg_class_subset_p (reload_class
, insn_class
))
962 gcc_assert (scratch_class
== rclass
);
969 if (rclass
== NO_REGS
)
972 sri
->t_icode
= icode
;
977 /* By default, if flag_pic is true, then neither local nor global relocs
978 should be placed in readonly memory. */
981 default_reloc_rw_mask (void)
983 return flag_pic
? 3 : 0;
986 /* By default, do no modification. */
987 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
993 /* Default to natural alignment for vector types. */
995 default_vector_alignment (const_tree type
)
997 return tree_to_shwi (TYPE_SIZE (type
));
1001 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
1006 /* Assuming that types whose size is > pointer-size are not guaranteed to be
1007 naturally aligned. */
1008 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
1011 /* Assuming that types whose size is <= pointer-size
1012 are naturally aligned. */
1016 /* By default, assume that a target supports any factor of misalignment
1017 memory access if it supports movmisalign patten.
1018 is_packed is true if the memory access is defined in a packed struct. */
1020 default_builtin_support_vector_misalignment (enum machine_mode mode
,
1028 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1033 /* By default, only attempt to parallelize bitwise operations, and
1034 possibly adds/subtracts using bit-twiddling. */
1037 default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED
)
1042 /* By default only the size derived from the preferred vector mode
1046 default_autovectorize_vector_sizes (void)
1051 /* By default, the cost model accumulates three separate costs (prologue,
1052 loop body, and epilogue) for a vectorized loop or block. So allocate an
1053 array of three unsigned ints, set it to zero, and return its address. */
1056 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1058 unsigned *cost
= XNEWVEC (unsigned, 3);
1059 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1063 /* By default, the cost model looks up the cost of the given statement
1064 kind and mode, multiplies it by the occurrence count, accumulates
1065 it into the cost specified by WHERE, and returns the cost added. */
1068 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1069 struct _stmt_vec_info
*stmt_info
, int misalign
,
1070 enum vect_cost_model_location where
)
1072 unsigned *cost
= (unsigned *) data
;
1073 unsigned retval
= 0;
1075 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1076 int stmt_cost
= default_builtin_vectorization_cost (kind
, vectype
,
1078 /* Statements in an inner loop relative to the loop being
1079 vectorized are weighted more heavily. The value here is
1080 arbitrary and could potentially be improved with analysis. */
1081 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1082 count
*= 50; /* FIXME. */
1084 retval
= (unsigned) (count
* stmt_cost
);
1085 cost
[where
] += retval
;
1090 /* By default, the cost model just returns the accumulated costs. */
1093 default_finish_cost (void *data
, unsigned *prologue_cost
,
1094 unsigned *body_cost
, unsigned *epilogue_cost
)
1096 unsigned *cost
= (unsigned *) data
;
1097 *prologue_cost
= cost
[vect_prologue
];
1098 *body_cost
= cost
[vect_body
];
1099 *epilogue_cost
= cost
[vect_epilogue
];
1102 /* Free the cost data. */
1105 default_destroy_cost_data (void *data
)
1110 /* Determine whether or not a pointer mode is valid. Assume defaults
1111 of ptr_mode or Pmode - can be overridden. */
1113 default_valid_pointer_mode (enum machine_mode mode
)
1115 return (mode
== ptr_mode
|| mode
== Pmode
);
1118 /* Determine whether the memory reference specified by REF may alias
1119 the C libraries errno location. */
1121 default_ref_may_alias_errno (ao_ref
*ref
)
1123 tree base
= ao_ref_base (ref
);
1124 /* The default implementation assumes the errno location is
1125 a declaration of type int or is always accessed via a
1126 pointer to int. We assume that accesses to errno are
1127 not deliberately obfuscated (even in conforming ways). */
1128 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1129 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1131 /* The default implementation assumes an errno location
1132 declaration is never defined in the current compilation unit. */
1134 && !TREE_STATIC (base
))
1136 else if (TREE_CODE (base
) == MEM_REF
1137 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1139 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1140 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1145 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1146 for the generic address space only. */
1149 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1151 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1155 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1156 for the generic address space only. */
1159 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1161 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1165 /* Named address space version of valid_pointer_mode. */
1168 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
1170 if (!ADDR_SPACE_GENERIC_P (as
))
1171 return (mode
== targetm
.addr_space
.pointer_mode (as
)
1172 || mode
== targetm
.addr_space
.address_mode (as
));
1174 return targetm
.valid_pointer_mode (mode
);
1177 /* Some places still assume that all pointer or address modes are the
1178 standard Pmode and ptr_mode. These optimizations become invalid if
1179 the target actually supports multiple different modes. For now,
1180 we disable such optimizations on such targets, using this function. */
1183 target_default_pointer_address_modes_p (void)
1185 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1187 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1193 /* Named address space version of legitimate_address_p. */
1196 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
1197 bool strict
, addr_space_t as
)
1199 if (!ADDR_SPACE_GENERIC_P (as
))
1202 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1205 /* Named address space version of LEGITIMIZE_ADDRESS. */
1208 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
1209 enum machine_mode mode
, addr_space_t as
)
1211 if (!ADDR_SPACE_GENERIC_P (as
))
1214 return targetm
.legitimize_address (x
, oldx
, mode
);
1217 /* The default hook for determining if one named address space is a subset of
1218 another and to return which address space to use as the common address
1222 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1224 return (subset
== superset
);
1227 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1228 called for targets with only a generic address space. */
1231 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1232 tree from_type ATTRIBUTE_UNUSED
,
1233 tree to_type ATTRIBUTE_UNUSED
)
1239 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1244 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1247 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1248 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1254 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1255 tree
ARG_UNUSED (name
),
1256 tree
ARG_UNUSED (args
),
1257 int ARG_UNUSED (flags
))
1259 warning (OPT_Wattributes
,
1260 "target attribute is not supported on this machine");
1266 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1267 tree
ARG_UNUSED (pop_target
))
1269 warning (OPT_Wpragmas
,
1270 "#pragma GCC target is not supported for this machine");
1276 default_target_can_inline_p (tree caller
, tree callee
)
1279 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1280 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1282 /* If callee has no option attributes, then it is ok to inline */
1286 /* If caller has no option attributes, but callee does then it is not ok to
1288 else if (!caller_opts
)
1291 /* If both caller and callee have attributes, assume that if the
1292 pointer is different, the two functions have different target
1293 options since build_target_option_node uses a hash table for the
1296 ret
= (callee_opts
== caller_opts
);
1302 # define HAVE_casesi 0
1305 /* If the machine does not have a case insn that compares the bounds,
1306 this means extra overhead for dispatch tables, which raises the
1307 threshold for using them. */
1310 default_case_values_threshold (void)
1312 return (HAVE_casesi
? 4 : 5);
1316 default_have_conditional_execution (void)
1318 #ifdef HAVE_conditional_execution
1319 return HAVE_conditional_execution
;
1326 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1331 /* Compute cost of moving registers to/from memory. */
1334 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1335 reg_class_t rclass ATTRIBUTE_UNUSED
,
1336 bool in ATTRIBUTE_UNUSED
)
1338 #ifndef MEMORY_MOVE_COST
1339 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1341 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1345 /* Compute cost of moving data from a register of class FROM to one of
1349 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1350 reg_class_t from ATTRIBUTE_UNUSED
,
1351 reg_class_t to ATTRIBUTE_UNUSED
)
1353 #ifndef REGISTER_MOVE_COST
1356 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1361 default_profile_before_prologue (void)
1363 #ifdef PROFILE_BEFORE_PROLOGUE
1370 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1373 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1376 #ifdef PREFERRED_RELOAD_CLASS
1377 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1383 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1386 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1392 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1394 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1399 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1402 default_class_likely_spilled_p (reg_class_t rclass
)
1404 return (reg_class_size
[(int) rclass
] == 1);
1407 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1410 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1411 enum machine_mode mode ATTRIBUTE_UNUSED
)
1413 #ifdef CLASS_MAX_NREGS
1414 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1416 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1420 /* Determine the debugging unwind mechanism for the target. */
1422 enum unwind_info_type
1423 default_debug_unwind_info (void)
1425 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1426 /* ??? Change all users to the hook, then poison this. */
1427 #ifdef DWARF2_FRAME_INFO
1428 if (DWARF2_FRAME_INFO
)
1432 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1433 #ifdef DWARF2_DEBUGGING_INFO
1434 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1441 /* To be used by targets where reg_raw_mode doesn't return the right
1442 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1445 default_get_reg_raw_mode (int regno
)
1447 return reg_raw_mode
[regno
];
1450 /* Return true if a leaf function should stay leaf even with profiling
1454 default_keep_leaf_when_profiled ()
1459 /* Return true if the state of option OPTION should be stored in PCH files
1460 and checked by default_pch_valid_p. Store the option's current state
1464 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1466 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1468 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1470 if (option_flag_var (option
, &global_options
) == &target_flags
)
1471 if (targetm
.check_pch_target_flags
)
1473 return get_option_state (&global_options
, option
, state
);
1476 /* Default version of get_pch_validity.
1477 By default, every flag difference is fatal; that will be mostly right for
1478 most targets, but completely right for very few. */
1481 default_get_pch_validity (size_t *sz
)
1483 struct cl_option_state state
;
1488 if (targetm
.check_pch_target_flags
)
1489 *sz
+= sizeof (target_flags
);
1490 for (i
= 0; i
< cl_options_count
; i
++)
1491 if (option_affects_pch_p (i
, &state
))
1494 result
= r
= XNEWVEC (char, *sz
);
1498 if (targetm
.check_pch_target_flags
)
1500 memcpy (r
, &target_flags
, sizeof (target_flags
));
1501 r
+= sizeof (target_flags
);
1504 for (i
= 0; i
< cl_options_count
; i
++)
1505 if (option_affects_pch_p (i
, &state
))
1507 memcpy (r
, state
.data
, state
.size
);
1514 /* Return a message which says that a PCH file was created with a different
1515 setting of OPTION. */
1518 pch_option_mismatch (const char *option
)
1522 asprintf (&r
, _("created and used with differing settings of '%s'"), option
);
1524 return _("out of memory");
1528 /* Default version of pch_valid_p. */
1531 default_pch_valid_p (const void *data_p
, size_t len
)
1533 struct cl_option_state state
;
1534 const char *data
= (const char *)data_p
;
1537 /* -fpic and -fpie also usually make a PCH invalid. */
1538 if (data
[0] != flag_pic
)
1539 return _("created and used with different settings of -fpic");
1540 if (data
[1] != flag_pie
)
1541 return _("created and used with different settings of -fpie");
1544 /* Check target_flags. */
1545 if (targetm
.check_pch_target_flags
)
1550 memcpy (&tf
, data
, sizeof (target_flags
));
1551 data
+= sizeof (target_flags
);
1552 len
-= sizeof (target_flags
);
1553 r
= targetm
.check_pch_target_flags (tf
);
1558 for (i
= 0; i
< cl_options_count
; i
++)
1559 if (option_affects_pch_p (i
, &state
))
1561 if (memcmp (data
, state
.data
, state
.size
) != 0)
1562 return pch_option_mismatch (cl_options
[i
].opt_text
);
1570 /* Default version of cstore_mode. */
1573 default_cstore_mode (enum insn_code icode
)
1575 return insn_data
[(int) icode
].operand
[0].mode
;
1578 /* Default version of member_type_forces_blk. */
1581 default_member_type_forces_blk (const_tree
, enum machine_mode
)
1586 /* Default version of canonicalize_comparison. */
1589 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1593 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
1596 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
1600 #ifndef PAD_VARARGS_DOWN
1601 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
1604 /* Build an indirect-ref expression over the given TREE, which represents a
1605 piece of a va_arg() expansion. */
1607 build_va_arg_indirect_ref (tree addr
)
1609 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
1613 /* The "standard" implementation of va_arg: read the value from the
1614 current (padded) address and increment by the (padded) size. */
1617 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
1620 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
1621 unsigned HOST_WIDE_INT align
, boundary
;
1624 #ifdef ARGS_GROW_DOWNWARD
1625 /* All of the alignment and movement below is for args-grow-up machines.
1626 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
1627 implement their own specialized gimplify_va_arg_expr routines. */
1631 indirect
= pass_by_reference (NULL
, TYPE_MODE (type
), type
, false);
1633 type
= build_pointer_type (type
);
1635 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
1636 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
1638 /* When we align parameter on stack for caller, if the parameter
1639 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
1640 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
1641 here with caller. */
1642 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
1643 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
1645 boundary
/= BITS_PER_UNIT
;
1647 /* Hoist the valist value into a temporary for the moment. */
1648 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
1650 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
1651 requires greater alignment, we must perform dynamic alignment. */
1652 if (boundary
> align
1653 && !integer_zerop (TYPE_SIZE (type
)))
1655 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1656 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
1657 gimplify_and_add (t
, pre_p
);
1659 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1660 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
1662 build_int_cst (TREE_TYPE (valist
), -boundary
)));
1663 gimplify_and_add (t
, pre_p
);
1668 /* If the actual alignment is less than the alignment of the type,
1669 adjust the type accordingly so that we don't assume strict alignment
1670 when dereferencing the pointer. */
1671 boundary
*= BITS_PER_UNIT
;
1672 if (boundary
< TYPE_ALIGN (type
))
1674 type
= build_variant_type_copy (type
);
1675 TYPE_ALIGN (type
) = boundary
;
1678 /* Compute the rounded size of the type. */
1679 type_size
= size_in_bytes (type
);
1680 rounded_size
= round_up (type_size
, align
);
1682 /* Reduce rounded_size so it's sharable with the postqueue. */
1683 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
1687 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
1689 /* Small args are padded downward. */
1690 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
1691 rounded_size
, size_int (align
));
1692 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
1693 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
1694 addr
= fold_build_pointer_plus (addr
, t
);
1697 /* Compute new value for AP. */
1698 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
1699 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
1700 gimplify_and_add (t
, pre_p
);
1702 addr
= fold_convert (build_pointer_type (type
), addr
);
1705 addr
= build_va_arg_indirect_ref (addr
);
1707 return build_va_arg_indirect_ref (addr
);
1710 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
1711 not support nested low-overhead loops. */
1714 can_use_doloop_if_innermost (double_int
, double_int
,
1715 unsigned int loop_depth
, bool)
1717 return loop_depth
== 1;
1720 #include "gt-targhooks.h"