1 /* Default target hook functions.
2 Copyright (C) 2003-2017 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 "tree-ssa-alias.h"
57 #include "gimple-expr.h"
60 #include "stringpool.h"
62 #include "tree-ssanames.h"
63 #include "profile-count.h"
67 #include "diagnostic-core.h"
68 #include "fold-const.h"
69 #include "stor-layout.h"
76 #include "common/common-target.h"
87 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
88 rtx addr ATTRIBUTE_UNUSED
,
89 bool strict ATTRIBUTE_UNUSED
)
91 #ifdef GO_IF_LEGITIMATE_ADDRESS
92 /* Defer to the old implementation using a goto. */
94 return strict_memory_address_p (mode
, addr
);
96 return memory_address_p (mode
, addr
);
103 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
105 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
106 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
111 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
115 /* Any floating arithmetic may trap. */
116 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
119 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
121 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
129 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
131 int *punsignedp ATTRIBUTE_UNUSED
,
132 const_tree funtype ATTRIBUTE_UNUSED
,
133 int for_return ATTRIBUTE_UNUSED
)
135 if (type
!= NULL_TREE
&& for_return
== 2)
136 return promote_mode (type
, mode
, punsignedp
);
141 default_promote_function_mode_always_promote (const_tree type
,
144 const_tree funtype ATTRIBUTE_UNUSED
,
145 int for_return ATTRIBUTE_UNUSED
)
147 return promote_mode (type
, mode
, punsignedp
);
151 default_cc_modes_compatible (machine_mode m1
, machine_mode m2
)
159 default_return_in_memory (const_tree type
,
160 const_tree fntype ATTRIBUTE_UNUSED
)
162 return (TYPE_MODE (type
) == BLKmode
);
166 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
167 machine_mode mode ATTRIBUTE_UNUSED
)
173 default_legitimize_address_displacement (rtx
*disp ATTRIBUTE_UNUSED
,
174 rtx
*offset ATTRIBUTE_UNUSED
,
175 machine_mode mode ATTRIBUTE_UNUSED
)
181 default_expand_builtin_saveregs (void)
183 error ("__builtin_saveregs not supported by this target");
188 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED
,
189 machine_mode mode ATTRIBUTE_UNUSED
,
190 tree type ATTRIBUTE_UNUSED
,
191 int *pretend_arg_size ATTRIBUTE_UNUSED
,
192 int second_time ATTRIBUTE_UNUSED
)
196 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
199 default_builtin_setjmp_frame_value (void)
201 return virtual_stack_vars_rtx
;
204 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
207 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
213 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
215 return (targetm
.calls
.setup_incoming_varargs
216 != default_setup_incoming_varargs
);
220 default_eh_return_filter_mode (void)
222 return targetm
.unwind_word_mode ();
226 default_libgcc_cmp_return_mode (void)
232 default_libgcc_shift_count_mode (void)
238 default_unwind_word_mode (void)
243 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
245 unsigned HOST_WIDE_INT
246 default_shift_truncation_mask (machine_mode mode
)
248 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
251 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
254 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED
)
256 return have_insn_for (DIV
, mode
) ? 3 : 2;
259 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
262 default_mode_rep_extended (scalar_int_mode
, scalar_int_mode
)
267 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
270 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
275 /* Return machine mode for non-standard suffix
276 or VOIDmode if non-standard suffixes are unsupported. */
278 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
283 /* The generic C++ ABI specifies this is a 64-bit value. */
285 default_cxx_guard_type (void)
287 return long_long_integer_type_node
;
290 /* Returns the size of the cookie to use when allocating an array
291 whose elements have the indicated TYPE. Assumes that it is already
292 known that a cookie is needed. */
295 default_cxx_get_cookie_size (tree type
)
299 /* We need to allocate an additional max (sizeof (size_t), alignof
300 (true_type)) bytes. */
304 sizetype_size
= size_in_bytes (sizetype
);
305 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
306 if (tree_int_cst_lt (type_align
, sizetype_size
))
307 cookie_size
= sizetype_size
;
309 cookie_size
= type_align
;
314 /* Return true if a parameter must be passed by reference. This version
315 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
318 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED
,
319 machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
320 bool named_arg ATTRIBUTE_UNUSED
)
322 return targetm
.calls
.must_pass_in_stack (mode
, type
);
325 /* Return true if a parameter follows callee copies conventions. This
326 version of the hook is true for all named arguments. */
329 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED
,
330 machine_mode mode ATTRIBUTE_UNUSED
,
331 const_tree type ATTRIBUTE_UNUSED
, bool named
)
336 /* Emit to STREAM the assembler syntax for insn operand X. */
339 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
340 int code ATTRIBUTE_UNUSED
)
343 PRINT_OPERAND (stream
, x
, code
);
349 /* Emit to STREAM the assembler syntax for an insn operand whose memory
353 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
354 machine_mode
/*mode*/,
355 rtx x ATTRIBUTE_UNUSED
)
357 #ifdef PRINT_OPERAND_ADDRESS
358 PRINT_OPERAND_ADDRESS (stream
, x
);
364 /* Return true if CODE is a valid punctuation character for the
365 `print_operand' hook. */
368 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
370 #ifdef PRINT_OPERAND_PUNCT_VALID_P
371 return PRINT_OPERAND_PUNCT_VALID_P (code
);
377 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
379 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
381 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
382 const char *stripped
= targetm
.strip_name_encoding (skipped
);
383 if (*name
!= '*' && user_label_prefix
[0])
384 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
385 return get_identifier (stripped
);
388 /* True if MODE is valid for the target. By "valid", we mean able to
389 be manipulated in non-trivial ways. In particular, this means all
390 the arithmetic is supported.
392 By default we guess this means that any C type is supported. If
393 we can't map the mode back to a type that would be available in C,
394 then reject it. Special case, here, is the double-word arithmetic
395 supported by optabs.c. */
398 default_scalar_mode_supported_p (machine_mode mode
)
400 int precision
= GET_MODE_PRECISION (mode
);
402 switch (GET_MODE_CLASS (mode
))
404 case MODE_PARTIAL_INT
:
406 if (precision
== CHAR_TYPE_SIZE
)
408 if (precision
== SHORT_TYPE_SIZE
)
410 if (precision
== INT_TYPE_SIZE
)
412 if (precision
== LONG_TYPE_SIZE
)
414 if (precision
== LONG_LONG_TYPE_SIZE
)
416 if (precision
== 2 * BITS_PER_WORD
)
421 if (precision
== FLOAT_TYPE_SIZE
)
423 if (precision
== DOUBLE_TYPE_SIZE
)
425 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
429 case MODE_DECIMAL_FLOAT
:
441 /* Return true if libgcc supports floating-point mode MODE (known to
442 be supported as a scalar mode). */
445 default_libgcc_floating_mode_supported_p (scalar_float_mode mode
)
468 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
469 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
471 opt_scalar_float_mode
472 default_floatn_mode (int n
, bool extended
)
476 opt_scalar_float_mode cand1
, cand2
;
477 scalar_float_mode mode
;
499 /* Those are the only valid _FloatNx types. */
502 if (cand1
.exists (&mode
)
503 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
504 && targetm
.scalar_mode_supported_p (mode
)
505 && targetm
.libgcc_floating_mode_supported_p (mode
))
507 if (cand2
.exists (&mode
)
508 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
509 && targetm
.scalar_mode_supported_p (mode
)
510 && targetm
.libgcc_floating_mode_supported_p (mode
))
515 opt_scalar_float_mode cand
;
516 scalar_float_mode mode
;
520 /* Always enable _Float16 if we have basic support for the mode.
521 Targets can control the range and precision of operations on
522 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
549 if (cand
.exists (&mode
)
550 && REAL_MODE_FORMAT (mode
)->ieee_bits
== n
551 && targetm
.scalar_mode_supported_p (mode
)
552 && targetm
.libgcc_floating_mode_supported_p (mode
))
555 return opt_scalar_float_mode ();
558 /* Make some target macros useable by target-independent code. */
560 targhook_words_big_endian (void)
562 return !!WORDS_BIG_ENDIAN
;
566 targhook_float_words_big_endian (void)
568 return !!FLOAT_WORDS_BIG_ENDIAN
;
571 /* True if the target supports floating-point exceptions and rounding
575 default_float_exceptions_rounding_supported_p (void)
584 /* True if the target supports decimal floating point. */
587 default_decimal_float_supported_p (void)
589 return ENABLE_DECIMAL_FLOAT
;
592 /* True if the target supports fixed-point arithmetic. */
595 default_fixed_point_supported_p (void)
597 return ENABLE_FIXED_POINT
;
600 /* True if the target supports GNU indirect functions. */
603 default_has_ifunc_p (void)
605 return HAVE_GNU_INDIRECT_FUNCTION
;
608 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
611 This function checks whether a given INSN is valid within a low-overhead
612 loop. If INSN is invalid it returns the reason for that, otherwise it
613 returns NULL. A called function may clobber any special registers required
614 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
615 register for branch on table instructions. We reject the doloop pattern in
619 default_invalid_within_doloop (const rtx_insn
*insn
)
622 return "Function call in loop.";
624 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
625 return "Computed branch in the loop.";
630 /* Mapping of builtin functions to vectorized variants. */
633 default_builtin_vectorized_function (unsigned int, tree
, tree
)
638 /* Mapping of target builtin functions to vectorized variants. */
641 default_builtin_md_vectorized_function (tree
, tree
, tree
)
646 /* Vectorized conversion. */
649 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
650 tree dest_type ATTRIBUTE_UNUSED
,
651 tree src_type ATTRIBUTE_UNUSED
)
656 /* Default vectorizer cost model values. */
659 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
661 int misalign ATTRIBUTE_UNUSED
)
663 switch (type_of_cost
)
673 case cond_branch_not_taken
:
675 case vec_promote_demote
:
679 case unaligned_store
:
682 case cond_branch_taken
:
686 return TYPE_VECTOR_SUBPARTS (vectype
) - 1;
696 default_builtin_reciprocal (tree
)
702 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
703 cumulative_args_t ca ATTRIBUTE_UNUSED
,
704 machine_mode mode ATTRIBUTE_UNUSED
,
705 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
711 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
712 cumulative_args_t ca ATTRIBUTE_UNUSED
,
713 machine_mode mode ATTRIBUTE_UNUSED
,
714 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
720 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
721 cumulative_args_t ca ATTRIBUTE_UNUSED
,
722 machine_mode mode ATTRIBUTE_UNUSED
,
723 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
729 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
730 machine_mode mode ATTRIBUTE_UNUSED
,
731 const_tree type ATTRIBUTE_UNUSED
,
732 bool named ATTRIBUTE_UNUSED
)
738 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
739 machine_mode mode ATTRIBUTE_UNUSED
,
740 const_tree type ATTRIBUTE_UNUSED
,
741 bool named ATTRIBUTE_UNUSED
)
747 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
748 machine_mode mode ATTRIBUTE_UNUSED
,
749 const_tree type ATTRIBUTE_UNUSED
,
750 bool named ATTRIBUTE_UNUSED
)
756 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
757 const_tree type ATTRIBUTE_UNUSED
)
759 return PARM_BOUNDARY
;
763 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
764 const_tree type ATTRIBUTE_UNUSED
)
766 return PARM_BOUNDARY
;
770 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
775 hook_invalid_arg_for_unprototyped_fn (
776 const_tree typelist ATTRIBUTE_UNUSED
,
777 const_tree funcdecl ATTRIBUTE_UNUSED
,
778 const_tree val ATTRIBUTE_UNUSED
)
783 /* Initialize the stack protection decls. */
785 /* Stack protection related decls living in libgcc. */
786 static GTY(()) tree stack_chk_guard_decl
;
789 default_stack_protect_guard (void)
791 tree t
= stack_chk_guard_decl
;
797 t
= build_decl (UNKNOWN_LOCATION
,
798 VAR_DECL
, get_identifier ("__stack_chk_guard"),
802 DECL_EXTERNAL (t
) = 1;
804 TREE_THIS_VOLATILE (t
) = 1;
805 DECL_ARTIFICIAL (t
) = 1;
806 DECL_IGNORED_P (t
) = 1;
808 /* Do not share RTL as the declaration is visible outside of
811 RTX_FLAG (x
, used
) = 1;
813 stack_chk_guard_decl
= t
;
819 static GTY(()) tree stack_chk_fail_decl
;
822 default_external_stack_protect_fail (void)
824 tree t
= stack_chk_fail_decl
;
828 t
= build_function_type_list (void_type_node
, NULL_TREE
);
829 t
= build_decl (UNKNOWN_LOCATION
,
830 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
833 DECL_EXTERNAL (t
) = 1;
835 TREE_THIS_VOLATILE (t
) = 1;
836 TREE_NOTHROW (t
) = 1;
837 DECL_ARTIFICIAL (t
) = 1;
838 DECL_IGNORED_P (t
) = 1;
839 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
840 DECL_VISIBILITY_SPECIFIED (t
) = 1;
842 stack_chk_fail_decl
= t
;
845 return build_call_expr (t
, 0);
849 default_hidden_stack_protect_fail (void)
851 #ifndef HAVE_GAS_HIDDEN
852 return default_external_stack_protect_fail ();
854 tree t
= stack_chk_fail_decl
;
857 return default_external_stack_protect_fail ();
861 t
= build_function_type_list (void_type_node
, NULL_TREE
);
862 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
863 get_identifier ("__stack_chk_fail_local"), t
);
866 DECL_EXTERNAL (t
) = 1;
868 TREE_THIS_VOLATILE (t
) = 1;
869 TREE_NOTHROW (t
) = 1;
870 DECL_ARTIFICIAL (t
) = 1;
871 DECL_IGNORED_P (t
) = 1;
872 DECL_VISIBILITY_SPECIFIED (t
) = 1;
873 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
875 stack_chk_fail_decl
= t
;
878 return build_call_expr (t
, 0);
883 hook_bool_const_rtx_commutative_p (const_rtx x
,
884 int outer_code ATTRIBUTE_UNUSED
)
886 return COMMUTATIVE_P (x
);
890 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
891 const_tree fn_decl_or_type
,
892 bool outgoing ATTRIBUTE_UNUSED
)
894 /* The old interface doesn't handle receiving the function type. */
896 && !DECL_P (fn_decl_or_type
))
897 fn_decl_or_type
= NULL
;
899 #ifdef FUNCTION_VALUE
900 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
907 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
908 const_rtx fun ATTRIBUTE_UNUSED
)
911 return LIBCALL_VALUE (mode
);
917 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
920 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
922 #ifdef FUNCTION_VALUE_REGNO_P
923 return FUNCTION_VALUE_REGNO_P (regno
);
930 default_internal_arg_pointer (void)
932 /* If the reg that the virtual arg pointer will be translated into is
933 not a fixed reg or is the stack pointer, make a copy of the virtual
934 arg pointer, and address parms via the copy. The frame pointer is
935 considered fixed even though it is not marked as such. */
936 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
937 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
938 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
939 return copy_to_reg (virtual_incoming_args_rtx
);
941 return virtual_incoming_args_rtx
;
945 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
949 #ifdef STATIC_CHAIN_INCOMING_REGNUM
950 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
954 #ifdef STATIC_CHAIN_REGNUM
955 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
959 static bool issued_error
;
963 sorry ("nested functions not supported on this target");
966 /* It really doesn't matter what we return here, so long at it
967 doesn't cause the rest of the compiler to crash. */
968 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
973 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
974 rtx
ARG_UNUSED (r_chain
))
976 sorry ("nested function trampolines not supported on this target");
980 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
981 tree funtype ATTRIBUTE_UNUSED
,
982 int size ATTRIBUTE_UNUSED
)
988 default_branch_target_register_class (void)
994 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
996 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1002 default_lra_p (void)
1008 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1014 default_register_usage_leveling_p (void)
1020 default_different_addr_displacement_p (void)
1026 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1027 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1028 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1029 secondary_reload_info
*sri
)
1031 enum reg_class rclass
= NO_REGS
;
1032 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1034 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1036 sri
->icode
= sri
->prev_sri
->t_icode
;
1039 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1041 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
1043 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1045 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
1047 if (rclass
!= NO_REGS
)
1049 enum insn_code icode
1050 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1053 if (icode
!= CODE_FOR_nothing
1054 && !insn_operand_matches (icode
, in_p
, x
))
1055 icode
= CODE_FOR_nothing
;
1056 else if (icode
!= CODE_FOR_nothing
)
1058 const char *insn_constraint
, *scratch_constraint
;
1059 enum reg_class insn_class
, scratch_class
;
1061 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1062 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1063 if (!*insn_constraint
)
1064 insn_class
= ALL_REGS
;
1069 gcc_assert (*insn_constraint
== '=');
1072 insn_class
= (reg_class_for_constraint
1073 (lookup_constraint (insn_constraint
)));
1074 gcc_assert (insn_class
!= NO_REGS
);
1077 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1078 /* The scratch register's constraint must start with "=&",
1079 except for an input reload, where only "=" is necessary,
1080 and where it might be beneficial to re-use registers from
1082 gcc_assert (scratch_constraint
[0] == '='
1083 && (in_p
|| scratch_constraint
[1] == '&'));
1084 scratch_constraint
++;
1085 if (*scratch_constraint
== '&')
1086 scratch_constraint
++;
1087 scratch_class
= (reg_class_for_constraint
1088 (lookup_constraint (scratch_constraint
)));
1090 if (reg_class_subset_p (reload_class
, insn_class
))
1092 gcc_assert (scratch_class
== rclass
);
1096 rclass
= insn_class
;
1099 if (rclass
== NO_REGS
)
1102 sri
->t_icode
= icode
;
1107 /* By default, if flag_pic is true, then neither local nor global relocs
1108 should be placed in readonly memory. */
1111 default_reloc_rw_mask (void)
1113 return flag_pic
? 3 : 0;
1116 /* By default, do no modification. */
1117 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1123 /* Default to natural alignment for vector types. */
1125 default_vector_alignment (const_tree type
)
1127 HOST_WIDE_INT align
= tree_to_shwi (TYPE_SIZE (type
));
1128 if (align
> MAX_OFILE_ALIGNMENT
)
1129 align
= MAX_OFILE_ALIGNMENT
;
1133 /* By default assume vectors of element TYPE require a multiple of the natural
1134 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1136 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1141 /* By default, assume that a target supports any factor of misalignment
1142 memory access if it supports movmisalign patten.
1143 is_packed is true if the memory access is defined in a packed struct. */
1145 default_builtin_support_vector_misalignment (machine_mode mode
,
1153 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1158 /* By default, only attempt to parallelize bitwise operations, and
1159 possibly adds/subtracts using bit-twiddling. */
1162 default_preferred_simd_mode (machine_mode mode ATTRIBUTE_UNUSED
)
1167 /* By default only the size derived from the preferred vector mode
1171 default_autovectorize_vector_sizes (void)
1176 /* By defaults a vector of integers is used as a mask. */
1179 default_get_mask_mode (unsigned nunits
, unsigned vector_size
)
1181 unsigned elem_size
= vector_size
/ nunits
;
1182 scalar_int_mode elem_mode
1183 = smallest_int_mode_for_size (elem_size
* BITS_PER_UNIT
);
1184 machine_mode vector_mode
;
1186 gcc_assert (elem_size
* nunits
== vector_size
);
1188 vector_mode
= mode_for_vector (elem_mode
, nunits
);
1189 if (!VECTOR_MODE_P (vector_mode
)
1190 || !targetm
.vector_mode_supported_p (vector_mode
))
1191 vector_mode
= BLKmode
;
1196 /* By default, the cost model accumulates three separate costs (prologue,
1197 loop body, and epilogue) for a vectorized loop or block. So allocate an
1198 array of three unsigned ints, set it to zero, and return its address. */
1201 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1203 unsigned *cost
= XNEWVEC (unsigned, 3);
1204 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1208 /* By default, the cost model looks up the cost of the given statement
1209 kind and mode, multiplies it by the occurrence count, accumulates
1210 it into the cost specified by WHERE, and returns the cost added. */
1213 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1214 struct _stmt_vec_info
*stmt_info
, int misalign
,
1215 enum vect_cost_model_location where
)
1217 unsigned *cost
= (unsigned *) data
;
1218 unsigned retval
= 0;
1220 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1221 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1223 /* Statements in an inner loop relative to the loop being
1224 vectorized are weighted more heavily. The value here is
1225 arbitrary and could potentially be improved with analysis. */
1226 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1227 count
*= 50; /* FIXME. */
1229 retval
= (unsigned) (count
* stmt_cost
);
1230 cost
[where
] += retval
;
1235 /* By default, the cost model just returns the accumulated costs. */
1238 default_finish_cost (void *data
, unsigned *prologue_cost
,
1239 unsigned *body_cost
, unsigned *epilogue_cost
)
1241 unsigned *cost
= (unsigned *) data
;
1242 *prologue_cost
= cost
[vect_prologue
];
1243 *body_cost
= cost
[vect_body
];
1244 *epilogue_cost
= cost
[vect_epilogue
];
1247 /* Free the cost data. */
1250 default_destroy_cost_data (void *data
)
1255 /* Determine whether or not a pointer mode is valid. Assume defaults
1256 of ptr_mode or Pmode - can be overridden. */
1258 default_valid_pointer_mode (scalar_int_mode mode
)
1260 return (mode
== ptr_mode
|| mode
== Pmode
);
1263 /* Determine whether the memory reference specified by REF may alias
1264 the C libraries errno location. */
1266 default_ref_may_alias_errno (ao_ref
*ref
)
1268 tree base
= ao_ref_base (ref
);
1269 /* The default implementation assumes the errno location is
1270 a declaration of type int or is always accessed via a
1271 pointer to int. We assume that accesses to errno are
1272 not deliberately obfuscated (even in conforming ways). */
1273 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1274 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1276 /* The default implementation assumes an errno location
1277 declaration is never defined in the current compilation unit. */
1279 && !TREE_STATIC (base
))
1281 else if (TREE_CODE (base
) == MEM_REF
1282 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1284 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1285 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1290 /* Return the mode for a pointer to a given ADDRSPACE,
1291 defaulting to ptr_mode for all address spaces. */
1294 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1299 /* Return the mode for an address in a given ADDRSPACE,
1300 defaulting to Pmode for all address spaces. */
1303 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1308 /* Named address space version of valid_pointer_mode.
1309 To match the above, the same modes apply to all address spaces. */
1312 default_addr_space_valid_pointer_mode (scalar_int_mode mode
,
1313 addr_space_t as ATTRIBUTE_UNUSED
)
1315 return targetm
.valid_pointer_mode (mode
);
1318 /* Some places still assume that all pointer or address modes are the
1319 standard Pmode and ptr_mode. These optimizations become invalid if
1320 the target actually supports multiple different modes. For now,
1321 we disable such optimizations on such targets, using this function. */
1324 target_default_pointer_address_modes_p (void)
1326 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1328 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1334 /* Named address space version of legitimate_address_p.
1335 By default, all address spaces have the same form. */
1338 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1340 addr_space_t as ATTRIBUTE_UNUSED
)
1342 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1345 /* Named address space version of LEGITIMIZE_ADDRESS.
1346 By default, all address spaces have the same form. */
1349 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1350 addr_space_t as ATTRIBUTE_UNUSED
)
1352 return targetm
.legitimize_address (x
, oldx
, mode
);
1355 /* The default hook for determining if one named address space is a subset of
1356 another and to return which address space to use as the common address
1360 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1362 return (subset
== superset
);
1365 /* The default hook for determining if 0 within a named address
1366 space is a valid address. */
1369 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1374 /* The default hook for debugging the address space is to return the
1375 address space number to indicate DW_AT_address_class. */
1377 default_addr_space_debug (addr_space_t as
)
1382 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1383 Don't complain about any address space. */
1386 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1391 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1392 called for targets with only a generic address space. */
1395 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1396 tree from_type ATTRIBUTE_UNUSED
,
1397 tree to_type ATTRIBUTE_UNUSED
)
1403 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1408 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1411 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1412 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1418 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1419 tree
ARG_UNUSED (name
),
1420 tree
ARG_UNUSED (args
),
1421 int ARG_UNUSED (flags
))
1423 warning (OPT_Wattributes
,
1424 "target attribute is not supported on this machine");
1430 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1431 tree
ARG_UNUSED (pop_target
))
1433 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1434 emit no warning because "#pragma GCC pop_target" is valid on targets that
1435 do not have the "target" pragma. */
1437 warning (OPT_Wpragmas
,
1438 "#pragma GCC target is not supported for this machine");
1444 default_target_can_inline_p (tree caller
, tree callee
)
1446 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1447 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1449 callee_opts
= target_option_default_node
;
1451 caller_opts
= target_option_default_node
;
1453 /* If both caller and callee have attributes, assume that if the
1454 pointer is different, the two functions have different target
1455 options since build_target_option_node uses a hash table for the
1457 return callee_opts
== caller_opts
;
1460 /* If the machine does not have a case insn that compares the bounds,
1461 this means extra overhead for dispatch tables, which raises the
1462 threshold for using them. */
1465 default_case_values_threshold (void)
1467 return (targetm
.have_casesi () ? 4 : 5);
1471 default_have_conditional_execution (void)
1473 return HAVE_conditional_execution
;
1476 /* By default we assume that c99 functions are present at the runtime,
1477 but sincos is not. */
1479 default_libc_has_function (enum function_class fn_class
)
1481 if (fn_class
== function_c94
1482 || fn_class
== function_c99_misc
1483 || fn_class
== function_c99_math_complex
)
1490 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1496 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1502 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1507 /* Compute cost of moving registers to/from memory. */
1510 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1511 reg_class_t rclass ATTRIBUTE_UNUSED
,
1512 bool in ATTRIBUTE_UNUSED
)
1514 #ifndef MEMORY_MOVE_COST
1515 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1517 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1521 /* Compute cost of moving data from a register of class FROM to one of
1525 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1526 reg_class_t from ATTRIBUTE_UNUSED
,
1527 reg_class_t to ATTRIBUTE_UNUSED
)
1529 #ifndef REGISTER_MOVE_COST
1532 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1536 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1537 behavior. SPEED_P is true if we are compiling for speed. */
1540 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1542 unsigned int move_ratio
;
1544 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1546 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1548 #else /* No movmem patterns, pick a default. */
1549 move_ratio
= ((speed_p
) ? 15 : 3);
1555 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1556 used; return FALSE if the movmem/setmem optab should be expanded, or
1557 a call to memcpy emitted. */
1560 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1561 unsigned int alignment
,
1562 enum by_pieces_operation op
,
1565 unsigned int max_size
= 0;
1566 unsigned int ratio
= 0;
1570 case CLEAR_BY_PIECES
:
1571 max_size
= STORE_MAX_PIECES
;
1572 ratio
= CLEAR_RATIO (speed_p
);
1574 case MOVE_BY_PIECES
:
1575 max_size
= MOVE_MAX_PIECES
;
1576 ratio
= get_move_ratio (speed_p
);
1579 max_size
= STORE_MAX_PIECES
;
1580 ratio
= SET_RATIO (speed_p
);
1582 case STORE_BY_PIECES
:
1583 max_size
= STORE_MAX_PIECES
;
1584 ratio
= get_move_ratio (speed_p
);
1586 case COMPARE_BY_PIECES
:
1587 max_size
= COMPARE_MAX_PIECES
;
1588 /* Pick a likely default, just as in get_move_ratio. */
1589 ratio
= speed_p
? 15 : 3;
1593 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1596 /* This hook controls code generation for expanding a memcmp operation by
1597 pieces. Return 1 for the normal pattern of compare/jump after each pair
1598 of loads, or a higher number to reduce the number of branches. */
1601 default_compare_by_pieces_branch_ratio (machine_mode
)
1606 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1607 entry. If RECORD_P is true and the target supports named sections,
1608 the location of the NOPs will be recorded in a special object section
1609 called "__patchable_function_entries". This routine may be called
1610 twice per function to put NOPs before and after the function
1614 default_print_patchable_function_entry (FILE *file
,
1615 unsigned HOST_WIDE_INT patch_area_size
,
1618 const char *nop_templ
= 0;
1620 rtx_insn
*my_nop
= make_insn_raw (gen_nop ());
1622 /* We use the template alone, relying on the (currently sane) assumption
1623 that the NOP template does not have variable operands. */
1624 code_num
= recog_memoized (my_nop
);
1625 nop_templ
= get_insn_template (code_num
, my_nop
);
1627 if (record_p
&& targetm_common
.have_named_sections
)
1630 static int patch_area_number
;
1631 section
*previous_section
= in_section
;
1633 patch_area_number
++;
1634 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE", patch_area_number
);
1636 switch_to_section (get_section ("__patchable_function_entries",
1638 fputs (integer_asm_op (POINTER_SIZE_UNITS
, false), file
);
1639 assemble_name_raw (file
, buf
);
1642 switch_to_section (previous_section
);
1643 ASM_OUTPUT_LABEL (file
, buf
);
1647 for (i
= 0; i
< patch_area_size
; ++i
)
1648 fprintf (file
, "\t%s\n", nop_templ
);
1652 default_profile_before_prologue (void)
1654 #ifdef PROFILE_BEFORE_PROLOGUE
1661 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1664 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1667 #ifdef PREFERRED_RELOAD_CLASS
1668 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1674 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1677 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1683 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1685 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1690 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1693 default_class_likely_spilled_p (reg_class_t rclass
)
1695 return (reg_class_size
[(int) rclass
] == 1);
1698 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1701 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1702 machine_mode mode ATTRIBUTE_UNUSED
)
1704 #ifdef CLASS_MAX_NREGS
1705 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1707 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1711 /* Determine the debugging unwind mechanism for the target. */
1713 enum unwind_info_type
1714 default_debug_unwind_info (void)
1716 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1717 /* ??? Change all users to the hook, then poison this. */
1718 #ifdef DWARF2_FRAME_INFO
1719 if (DWARF2_FRAME_INFO
)
1723 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1724 #ifdef DWARF2_DEBUGGING_INFO
1725 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1732 /* Determine the correct mode for a Dwarf frame register that represents
1736 default_dwarf_frame_reg_mode (int regno
)
1738 machine_mode save_mode
= reg_raw_mode
[regno
];
1740 if (HARD_REGNO_CALL_PART_CLOBBERED (regno
, save_mode
))
1741 save_mode
= choose_hard_reg_mode (regno
, 1, true);
1745 /* To be used by targets where reg_raw_mode doesn't return the right
1746 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1749 default_get_reg_raw_mode (int regno
)
1751 return reg_raw_mode
[regno
];
1754 /* Return true if a leaf function should stay leaf even with profiling
1758 default_keep_leaf_when_profiled ()
1763 /* Return true if the state of option OPTION should be stored in PCH files
1764 and checked by default_pch_valid_p. Store the option's current state
1768 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1770 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1772 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1774 if (option_flag_var (option
, &global_options
) == &target_flags
)
1775 if (targetm
.check_pch_target_flags
)
1777 return get_option_state (&global_options
, option
, state
);
1780 /* Default version of get_pch_validity.
1781 By default, every flag difference is fatal; that will be mostly right for
1782 most targets, but completely right for very few. */
1785 default_get_pch_validity (size_t *sz
)
1787 struct cl_option_state state
;
1792 if (targetm
.check_pch_target_flags
)
1793 *sz
+= sizeof (target_flags
);
1794 for (i
= 0; i
< cl_options_count
; i
++)
1795 if (option_affects_pch_p (i
, &state
))
1798 result
= r
= XNEWVEC (char, *sz
);
1802 if (targetm
.check_pch_target_flags
)
1804 memcpy (r
, &target_flags
, sizeof (target_flags
));
1805 r
+= sizeof (target_flags
);
1808 for (i
= 0; i
< cl_options_count
; i
++)
1809 if (option_affects_pch_p (i
, &state
))
1811 memcpy (r
, state
.data
, state
.size
);
1818 /* Return a message which says that a PCH file was created with a different
1819 setting of OPTION. */
1822 pch_option_mismatch (const char *option
)
1824 return xasprintf (_("created and used with differing settings of '%s'"),
1828 /* Default version of pch_valid_p. */
1831 default_pch_valid_p (const void *data_p
, size_t len
)
1833 struct cl_option_state state
;
1834 const char *data
= (const char *)data_p
;
1837 /* -fpic and -fpie also usually make a PCH invalid. */
1838 if (data
[0] != flag_pic
)
1839 return _("created and used with different settings of -fpic");
1840 if (data
[1] != flag_pie
)
1841 return _("created and used with different settings of -fpie");
1844 /* Check target_flags. */
1845 if (targetm
.check_pch_target_flags
)
1850 memcpy (&tf
, data
, sizeof (target_flags
));
1851 data
+= sizeof (target_flags
);
1852 len
-= sizeof (target_flags
);
1853 r
= targetm
.check_pch_target_flags (tf
);
1858 for (i
= 0; i
< cl_options_count
; i
++)
1859 if (option_affects_pch_p (i
, &state
))
1861 if (memcmp (data
, state
.data
, state
.size
) != 0)
1862 return pch_option_mismatch (cl_options
[i
].opt_text
);
1870 /* Default version of cstore_mode. */
1873 default_cstore_mode (enum insn_code icode
)
1875 return as_a
<scalar_int_mode
> (insn_data
[(int) icode
].operand
[0].mode
);
1878 /* Default version of member_type_forces_blk. */
1881 default_member_type_forces_blk (const_tree
, machine_mode
)
1887 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
1888 rtx ptr ATTRIBUTE_UNUSED
,
1889 rtx bnd ATTRIBUTE_UNUSED
)
1895 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
1896 rtx addr ATTRIBUTE_UNUSED
,
1897 rtx bounds ATTRIBUTE_UNUSED
,
1898 rtx to ATTRIBUTE_UNUSED
)
1904 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
1910 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
1911 rtx bounds ATTRIBUTE_UNUSED
)
1916 /* Default version of canonicalize_comparison. */
1919 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1923 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
1926 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
1930 #ifndef PAD_VARARGS_DOWN
1931 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
1934 /* Build an indirect-ref expression over the given TREE, which represents a
1935 piece of a va_arg() expansion. */
1937 build_va_arg_indirect_ref (tree addr
)
1939 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
1943 /* The "standard" implementation of va_arg: read the value from the
1944 current (padded) address and increment by the (padded) size. */
1947 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
1950 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
1951 unsigned HOST_WIDE_INT align
, boundary
;
1954 /* All of the alignment and movement below is for args-grow-up machines.
1955 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
1956 implement their own specialized gimplify_va_arg_expr routines. */
1957 if (ARGS_GROW_DOWNWARD
)
1960 indirect
= pass_by_reference (NULL
, TYPE_MODE (type
), type
, false);
1962 type
= build_pointer_type (type
);
1964 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
1965 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
1967 /* When we align parameter on stack for caller, if the parameter
1968 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
1969 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
1970 here with caller. */
1971 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
1972 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
1974 boundary
/= BITS_PER_UNIT
;
1976 /* Hoist the valist value into a temporary for the moment. */
1977 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
1979 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
1980 requires greater alignment, we must perform dynamic alignment. */
1981 if (boundary
> align
1982 && !integer_zerop (TYPE_SIZE (type
)))
1984 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1985 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
1986 gimplify_and_add (t
, pre_p
);
1988 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1989 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
1991 build_int_cst (TREE_TYPE (valist
), -boundary
)));
1992 gimplify_and_add (t
, pre_p
);
1997 /* If the actual alignment is less than the alignment of the type,
1998 adjust the type accordingly so that we don't assume strict alignment
1999 when dereferencing the pointer. */
2000 boundary
*= BITS_PER_UNIT
;
2001 if (boundary
< TYPE_ALIGN (type
))
2003 type
= build_variant_type_copy (type
);
2004 SET_TYPE_ALIGN (type
, boundary
);
2007 /* Compute the rounded size of the type. */
2008 type_size
= size_in_bytes (type
);
2009 rounded_size
= round_up (type_size
, align
);
2011 /* Reduce rounded_size so it's sharable with the postqueue. */
2012 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2016 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2018 /* Small args are padded downward. */
2019 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2020 rounded_size
, size_int (align
));
2021 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2022 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2023 addr
= fold_build_pointer_plus (addr
, t
);
2026 /* Compute new value for AP. */
2027 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2028 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2029 gimplify_and_add (t
, pre_p
);
2031 addr
= fold_convert (build_pointer_type (type
), addr
);
2034 addr
= build_va_arg_indirect_ref (addr
);
2036 return build_va_arg_indirect_ref (addr
);
2040 default_chkp_bound_type (void)
2042 tree res
= make_node (POINTER_BOUNDS_TYPE
);
2043 TYPE_PRECISION (res
) = TYPE_PRECISION (size_type_node
) * 2;
2044 TYPE_NAME (res
) = get_identifier ("__bounds_type");
2045 SET_TYPE_MODE (res
, targetm
.chkp_bound_mode ());
2051 default_chkp_bound_mode (void)
2057 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED
)
2063 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED
,
2064 const_tree fn_decl_or_type ATTRIBUTE_UNUSED
,
2065 bool outgoing ATTRIBUTE_UNUSED
)
2071 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED
,
2072 HOST_WIDE_INT ub ATTRIBUTE_UNUSED
)
2078 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED
,
2079 tree lb ATTRIBUTE_UNUSED
,
2080 tree ub ATTRIBUTE_UNUSED
,
2081 tree
*stmts ATTRIBUTE_UNUSED
)
2087 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED
,
2088 machine_mode mode ATTRIBUTE_UNUSED
,
2089 tree type ATTRIBUTE_UNUSED
,
2090 int *pretend_arg_size ATTRIBUTE_UNUSED
,
2091 int second_time ATTRIBUTE_UNUSED
)
2095 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2096 not support nested low-overhead loops. */
2099 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2100 unsigned int loop_depth
, bool)
2102 return loop_depth
== 1;
2105 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2108 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2113 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2116 default_max_noce_ifcvt_seq_cost (edge e
)
2118 bool predictable_p
= predictable_edge_p (e
);
2120 enum compiler_param param
2122 ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2123 : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST
);
2125 /* If we have a parameter set, use that, otherwise take a guess using
2127 if (global_options_set
.x_param_values
[param
])
2128 return PARAM_VALUE (param
);
2130 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2133 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2136 default_min_arithmetic_precision (void)
2138 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2141 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2143 enum flt_eval_method
2144 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2146 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2149 #include "gt-targhooks.h"