1 /* Default target hook functions.
2 Copyright (C) 2003-2016 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"
66 #include "diagnostic-core.h"
67 #include "fold-const.h"
68 #include "stor-layout.h"
85 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
86 rtx addr ATTRIBUTE_UNUSED
,
87 bool strict ATTRIBUTE_UNUSED
)
89 #ifdef GO_IF_LEGITIMATE_ADDRESS
90 /* Defer to the old implementation using a goto. */
92 return strict_memory_address_p (mode
, addr
);
94 return memory_address_p (mode
, addr
);
101 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
103 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
104 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
109 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
113 /* Any floating arithmetic may trap. */
114 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
117 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
119 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
127 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
129 int *punsignedp ATTRIBUTE_UNUSED
,
130 const_tree funtype ATTRIBUTE_UNUSED
,
131 int for_return ATTRIBUTE_UNUSED
)
133 if (type
!= NULL_TREE
&& for_return
== 2)
134 return promote_mode (type
, mode
, punsignedp
);
139 default_promote_function_mode_always_promote (const_tree type
,
142 const_tree funtype ATTRIBUTE_UNUSED
,
143 int for_return ATTRIBUTE_UNUSED
)
145 return promote_mode (type
, mode
, punsignedp
);
149 default_cc_modes_compatible (machine_mode m1
, machine_mode m2
)
157 default_return_in_memory (const_tree type
,
158 const_tree fntype ATTRIBUTE_UNUSED
)
160 return (TYPE_MODE (type
) == BLKmode
);
164 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
165 machine_mode mode ATTRIBUTE_UNUSED
)
171 default_legitimize_address_displacement (rtx
*disp ATTRIBUTE_UNUSED
,
172 rtx
*offset ATTRIBUTE_UNUSED
,
173 machine_mode mode ATTRIBUTE_UNUSED
)
179 default_expand_builtin_saveregs (void)
181 error ("__builtin_saveregs not supported by this target");
186 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED
,
187 machine_mode mode ATTRIBUTE_UNUSED
,
188 tree type ATTRIBUTE_UNUSED
,
189 int *pretend_arg_size ATTRIBUTE_UNUSED
,
190 int second_time ATTRIBUTE_UNUSED
)
194 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
197 default_builtin_setjmp_frame_value (void)
199 return virtual_stack_vars_rtx
;
202 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
205 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
211 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
213 return (targetm
.calls
.setup_incoming_varargs
214 != default_setup_incoming_varargs
);
218 default_eh_return_filter_mode (void)
220 return targetm
.unwind_word_mode ();
224 default_libgcc_cmp_return_mode (void)
230 default_libgcc_shift_count_mode (void)
236 default_unwind_word_mode (void)
241 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
243 unsigned HOST_WIDE_INT
244 default_shift_truncation_mask (machine_mode mode
)
246 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
249 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
252 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED
)
254 return have_insn_for (DIV
, mode
) ? 3 : 2;
257 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
260 default_mode_rep_extended (machine_mode mode ATTRIBUTE_UNUSED
,
261 machine_mode mode_rep ATTRIBUTE_UNUSED
)
266 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
269 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
274 /* Return machine mode for non-standard suffix
275 or VOIDmode if non-standard suffixes are unsupported. */
277 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
282 /* The generic C++ ABI specifies this is a 64-bit value. */
284 default_cxx_guard_type (void)
286 return long_long_integer_type_node
;
289 /* Returns the size of the cookie to use when allocating an array
290 whose elements have the indicated TYPE. Assumes that it is already
291 known that a cookie is needed. */
294 default_cxx_get_cookie_size (tree type
)
298 /* We need to allocate an additional max (sizeof (size_t), alignof
299 (true_type)) bytes. */
303 sizetype_size
= size_in_bytes (sizetype
);
304 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
305 if (tree_int_cst_lt (type_align
, sizetype_size
))
306 cookie_size
= sizetype_size
;
308 cookie_size
= type_align
;
313 /* Return true if a parameter must be passed by reference. This version
314 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
317 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED
,
318 machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
319 bool named_arg ATTRIBUTE_UNUSED
)
321 return targetm
.calls
.must_pass_in_stack (mode
, type
);
324 /* Return true if a parameter follows callee copies conventions. This
325 version of the hook is true for all named arguments. */
328 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED
,
329 machine_mode mode ATTRIBUTE_UNUSED
,
330 const_tree type ATTRIBUTE_UNUSED
, bool named
)
335 /* Emit to STREAM the assembler syntax for insn operand X. */
338 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
339 int code ATTRIBUTE_UNUSED
)
342 PRINT_OPERAND (stream
, x
, code
);
348 /* Emit to STREAM the assembler syntax for an insn operand whose memory
352 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
353 machine_mode
/*mode*/,
354 rtx x ATTRIBUTE_UNUSED
)
356 #ifdef PRINT_OPERAND_ADDRESS
357 PRINT_OPERAND_ADDRESS (stream
, x
);
363 /* Return true if CODE is a valid punctuation character for the
364 `print_operand' hook. */
367 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
369 #ifdef PRINT_OPERAND_PUNCT_VALID_P
370 return PRINT_OPERAND_PUNCT_VALID_P (code
);
376 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
378 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
380 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
381 const char *stripped
= targetm
.strip_name_encoding (skipped
);
382 if (*name
!= '*' && user_label_prefix
[0])
383 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
384 return get_identifier (stripped
);
387 /* True if MODE is valid for the target. By "valid", we mean able to
388 be manipulated in non-trivial ways. In particular, this means all
389 the arithmetic is supported.
391 By default we guess this means that any C type is supported. If
392 we can't map the mode back to a type that would be available in C,
393 then reject it. Special case, here, is the double-word arithmetic
394 supported by optabs.c. */
397 default_scalar_mode_supported_p (machine_mode mode
)
399 int precision
= GET_MODE_PRECISION (mode
);
401 switch (GET_MODE_CLASS (mode
))
403 case MODE_PARTIAL_INT
:
405 if (precision
== CHAR_TYPE_SIZE
)
407 if (precision
== SHORT_TYPE_SIZE
)
409 if (precision
== INT_TYPE_SIZE
)
411 if (precision
== LONG_TYPE_SIZE
)
413 if (precision
== LONG_LONG_TYPE_SIZE
)
415 if (precision
== 2 * BITS_PER_WORD
)
420 if (precision
== FLOAT_TYPE_SIZE
)
422 if (precision
== DOUBLE_TYPE_SIZE
)
424 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
428 case MODE_DECIMAL_FLOAT
:
440 /* Return true if libgcc supports floating-point mode MODE (known to
441 be supported as a scalar mode). */
444 default_libgcc_floating_mode_supported_p (machine_mode mode
)
467 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
468 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
471 default_floatn_mode (int n
, bool extended
)
475 machine_mode cand1
= VOIDmode
, cand2
= VOIDmode
;
497 /* Those are the only valid _FloatNx types. */
500 if (cand1
!= VOIDmode
501 && REAL_MODE_FORMAT (cand1
)->ieee_bits
> n
502 && targetm
.scalar_mode_supported_p (cand1
)
503 && targetm
.libgcc_floating_mode_supported_p (cand1
))
505 if (cand2
!= VOIDmode
506 && REAL_MODE_FORMAT (cand2
)->ieee_bits
> n
507 && targetm
.scalar_mode_supported_p (cand2
)
508 && targetm
.libgcc_floating_mode_supported_p (cand2
))
513 machine_mode cand
= VOIDmode
;
517 /* We do not use HFmode for _Float16 by default because the
518 required excess precision support is not present and the
519 interactions with promotion of the older __fp16 need to
545 && REAL_MODE_FORMAT (cand
)->ieee_bits
== n
546 && targetm
.scalar_mode_supported_p (cand
)
547 && targetm
.libgcc_floating_mode_supported_p (cand
))
553 /* Make some target macros useable by target-independent code. */
555 targhook_words_big_endian (void)
557 return !!WORDS_BIG_ENDIAN
;
561 targhook_float_words_big_endian (void)
563 return !!FLOAT_WORDS_BIG_ENDIAN
;
566 /* True if the target supports floating-point exceptions and rounding
570 default_float_exceptions_rounding_supported_p (void)
579 /* True if the target supports decimal floating point. */
582 default_decimal_float_supported_p (void)
584 return ENABLE_DECIMAL_FLOAT
;
587 /* True if the target supports fixed-point arithmetic. */
590 default_fixed_point_supported_p (void)
592 return ENABLE_FIXED_POINT
;
595 /* True if the target supports GNU indirect functions. */
598 default_has_ifunc_p (void)
600 return HAVE_GNU_INDIRECT_FUNCTION
;
603 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
606 This function checks whether a given INSN is valid within a low-overhead
607 loop. If INSN is invalid it returns the reason for that, otherwise it
608 returns NULL. A called function may clobber any special registers required
609 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
610 register for branch on table instructions. We reject the doloop pattern in
614 default_invalid_within_doloop (const rtx_insn
*insn
)
617 return "Function call in loop.";
619 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
620 return "Computed branch in the loop.";
625 /* Mapping of builtin functions to vectorized variants. */
628 default_builtin_vectorized_function (unsigned int, tree
, tree
)
633 /* Mapping of target builtin functions to vectorized variants. */
636 default_builtin_md_vectorized_function (tree
, tree
, tree
)
641 /* Vectorized conversion. */
644 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
645 tree dest_type ATTRIBUTE_UNUSED
,
646 tree src_type ATTRIBUTE_UNUSED
)
651 /* Default vectorizer cost model values. */
654 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
656 int misalign ATTRIBUTE_UNUSED
)
658 switch (type_of_cost
)
668 case cond_branch_not_taken
:
670 case vec_promote_demote
:
674 case unaligned_store
:
677 case cond_branch_taken
:
681 return TYPE_VECTOR_SUBPARTS (vectype
) - 1;
691 default_builtin_reciprocal (tree
)
697 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
698 cumulative_args_t ca ATTRIBUTE_UNUSED
,
699 machine_mode mode ATTRIBUTE_UNUSED
,
700 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
706 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
707 cumulative_args_t ca ATTRIBUTE_UNUSED
,
708 machine_mode mode ATTRIBUTE_UNUSED
,
709 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
715 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
716 cumulative_args_t ca ATTRIBUTE_UNUSED
,
717 machine_mode mode ATTRIBUTE_UNUSED
,
718 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
724 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
725 machine_mode mode ATTRIBUTE_UNUSED
,
726 const_tree type ATTRIBUTE_UNUSED
,
727 bool named ATTRIBUTE_UNUSED
)
733 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
734 machine_mode mode ATTRIBUTE_UNUSED
,
735 const_tree type ATTRIBUTE_UNUSED
,
736 bool named ATTRIBUTE_UNUSED
)
742 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
743 machine_mode mode ATTRIBUTE_UNUSED
,
744 const_tree type ATTRIBUTE_UNUSED
,
745 bool named ATTRIBUTE_UNUSED
)
751 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
752 const_tree type ATTRIBUTE_UNUSED
)
754 return PARM_BOUNDARY
;
758 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
759 const_tree type ATTRIBUTE_UNUSED
)
761 return PARM_BOUNDARY
;
765 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
770 hook_invalid_arg_for_unprototyped_fn (
771 const_tree typelist ATTRIBUTE_UNUSED
,
772 const_tree funcdecl ATTRIBUTE_UNUSED
,
773 const_tree val ATTRIBUTE_UNUSED
)
778 /* Initialize the stack protection decls. */
780 /* Stack protection related decls living in libgcc. */
781 static GTY(()) tree stack_chk_guard_decl
;
784 default_stack_protect_guard (void)
786 tree t
= stack_chk_guard_decl
;
792 t
= build_decl (UNKNOWN_LOCATION
,
793 VAR_DECL
, get_identifier ("__stack_chk_guard"),
797 DECL_EXTERNAL (t
) = 1;
799 TREE_THIS_VOLATILE (t
) = 1;
800 DECL_ARTIFICIAL (t
) = 1;
801 DECL_IGNORED_P (t
) = 1;
803 /* Do not share RTL as the declaration is visible outside of
806 RTX_FLAG (x
, used
) = 1;
808 stack_chk_guard_decl
= t
;
814 static GTY(()) tree stack_chk_fail_decl
;
817 default_external_stack_protect_fail (void)
819 tree t
= stack_chk_fail_decl
;
823 t
= build_function_type_list (void_type_node
, NULL_TREE
);
824 t
= build_decl (UNKNOWN_LOCATION
,
825 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
828 DECL_EXTERNAL (t
) = 1;
830 TREE_THIS_VOLATILE (t
) = 1;
831 TREE_NOTHROW (t
) = 1;
832 DECL_ARTIFICIAL (t
) = 1;
833 DECL_IGNORED_P (t
) = 1;
834 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
835 DECL_VISIBILITY_SPECIFIED (t
) = 1;
837 stack_chk_fail_decl
= t
;
840 return build_call_expr (t
, 0);
844 default_hidden_stack_protect_fail (void)
846 #ifndef HAVE_GAS_HIDDEN
847 return default_external_stack_protect_fail ();
849 tree t
= stack_chk_fail_decl
;
852 return default_external_stack_protect_fail ();
856 t
= build_function_type_list (void_type_node
, NULL_TREE
);
857 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
858 get_identifier ("__stack_chk_fail_local"), t
);
861 DECL_EXTERNAL (t
) = 1;
863 TREE_THIS_VOLATILE (t
) = 1;
864 TREE_NOTHROW (t
) = 1;
865 DECL_ARTIFICIAL (t
) = 1;
866 DECL_IGNORED_P (t
) = 1;
867 DECL_VISIBILITY_SPECIFIED (t
) = 1;
868 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
870 stack_chk_fail_decl
= t
;
873 return build_call_expr (t
, 0);
878 hook_bool_const_rtx_commutative_p (const_rtx x
,
879 int outer_code ATTRIBUTE_UNUSED
)
881 return COMMUTATIVE_P (x
);
885 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
886 const_tree fn_decl_or_type
,
887 bool outgoing ATTRIBUTE_UNUSED
)
889 /* The old interface doesn't handle receiving the function type. */
891 && !DECL_P (fn_decl_or_type
))
892 fn_decl_or_type
= NULL
;
894 #ifdef FUNCTION_VALUE
895 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
902 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
903 const_rtx fun ATTRIBUTE_UNUSED
)
906 return LIBCALL_VALUE (mode
);
912 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
915 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
917 #ifdef FUNCTION_VALUE_REGNO_P
918 return FUNCTION_VALUE_REGNO_P (regno
);
925 default_internal_arg_pointer (void)
927 /* If the reg that the virtual arg pointer will be translated into is
928 not a fixed reg or is the stack pointer, make a copy of the virtual
929 arg pointer, and address parms via the copy. The frame pointer is
930 considered fixed even though it is not marked as such. */
931 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
932 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
933 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
934 return copy_to_reg (virtual_incoming_args_rtx
);
936 return virtual_incoming_args_rtx
;
940 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
944 #ifdef STATIC_CHAIN_INCOMING_REGNUM
945 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
949 #ifdef STATIC_CHAIN_REGNUM
950 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
954 static bool issued_error
;
958 sorry ("nested functions not supported on this target");
961 /* It really doesn't matter what we return here, so long at it
962 doesn't cause the rest of the compiler to crash. */
963 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
968 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
969 rtx
ARG_UNUSED (r_chain
))
971 sorry ("nested function trampolines not supported on this target");
975 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
976 tree funtype ATTRIBUTE_UNUSED
,
977 int size ATTRIBUTE_UNUSED
)
983 default_branch_target_register_class (void)
989 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
991 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1003 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1009 default_register_usage_leveling_p (void)
1015 default_different_addr_displacement_p (void)
1021 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1022 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1023 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1024 secondary_reload_info
*sri
)
1026 enum reg_class rclass
= NO_REGS
;
1027 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1029 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1031 sri
->icode
= sri
->prev_sri
->t_icode
;
1034 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1036 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
1038 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1040 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
1042 if (rclass
!= NO_REGS
)
1044 enum insn_code icode
1045 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1048 if (icode
!= CODE_FOR_nothing
1049 && !insn_operand_matches (icode
, in_p
, x
))
1050 icode
= CODE_FOR_nothing
;
1051 else if (icode
!= CODE_FOR_nothing
)
1053 const char *insn_constraint
, *scratch_constraint
;
1054 enum reg_class insn_class
, scratch_class
;
1056 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1057 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1058 if (!*insn_constraint
)
1059 insn_class
= ALL_REGS
;
1064 gcc_assert (*insn_constraint
== '=');
1067 insn_class
= (reg_class_for_constraint
1068 (lookup_constraint (insn_constraint
)));
1069 gcc_assert (insn_class
!= NO_REGS
);
1072 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1073 /* The scratch register's constraint must start with "=&",
1074 except for an input reload, where only "=" is necessary,
1075 and where it might be beneficial to re-use registers from
1077 gcc_assert (scratch_constraint
[0] == '='
1078 && (in_p
|| scratch_constraint
[1] == '&'));
1079 scratch_constraint
++;
1080 if (*scratch_constraint
== '&')
1081 scratch_constraint
++;
1082 scratch_class
= (reg_class_for_constraint
1083 (lookup_constraint (scratch_constraint
)));
1085 if (reg_class_subset_p (reload_class
, insn_class
))
1087 gcc_assert (scratch_class
== rclass
);
1091 rclass
= insn_class
;
1094 if (rclass
== NO_REGS
)
1097 sri
->t_icode
= icode
;
1102 /* By default, if flag_pic is true, then neither local nor global relocs
1103 should be placed in readonly memory. */
1106 default_reloc_rw_mask (void)
1108 return flag_pic
? 3 : 0;
1111 /* By default, do no modification. */
1112 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1118 /* Default to natural alignment for vector types. */
1120 default_vector_alignment (const_tree type
)
1122 HOST_WIDE_INT align
= tree_to_shwi (TYPE_SIZE (type
));
1123 if (align
> MAX_OFILE_ALIGNMENT
)
1124 align
= MAX_OFILE_ALIGNMENT
;
1129 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
1134 /* Assuming that types whose size is > pointer-size are not guaranteed to be
1135 naturally aligned. */
1136 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
1139 /* Assuming that types whose size is <= pointer-size
1140 are naturally aligned. */
1144 /* By default, assume that a target supports any factor of misalignment
1145 memory access if it supports movmisalign patten.
1146 is_packed is true if the memory access is defined in a packed struct. */
1148 default_builtin_support_vector_misalignment (machine_mode mode
,
1156 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1161 /* By default, only attempt to parallelize bitwise operations, and
1162 possibly adds/subtracts using bit-twiddling. */
1165 default_preferred_simd_mode (machine_mode mode ATTRIBUTE_UNUSED
)
1170 /* By default only the size derived from the preferred vector mode
1174 default_autovectorize_vector_sizes (void)
1179 /* By defaults a vector of integers is used as a mask. */
1182 default_get_mask_mode (unsigned nunits
, unsigned vector_size
)
1184 unsigned elem_size
= vector_size
/ nunits
;
1185 machine_mode elem_mode
1186 = smallest_mode_for_size (elem_size
* BITS_PER_UNIT
, MODE_INT
);
1187 machine_mode vector_mode
;
1189 gcc_assert (elem_size
* nunits
== vector_size
);
1191 vector_mode
= mode_for_vector (elem_mode
, nunits
);
1192 if (!VECTOR_MODE_P (vector_mode
)
1193 || !targetm
.vector_mode_supported_p (vector_mode
))
1194 vector_mode
= BLKmode
;
1199 /* By default, the cost model accumulates three separate costs (prologue,
1200 loop body, and epilogue) for a vectorized loop or block. So allocate an
1201 array of three unsigned ints, set it to zero, and return its address. */
1204 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1206 unsigned *cost
= XNEWVEC (unsigned, 3);
1207 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1211 /* By default, the cost model looks up the cost of the given statement
1212 kind and mode, multiplies it by the occurrence count, accumulates
1213 it into the cost specified by WHERE, and returns the cost added. */
1216 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1217 struct _stmt_vec_info
*stmt_info
, int misalign
,
1218 enum vect_cost_model_location where
)
1220 unsigned *cost
= (unsigned *) data
;
1221 unsigned retval
= 0;
1223 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1224 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1226 /* Statements in an inner loop relative to the loop being
1227 vectorized are weighted more heavily. The value here is
1228 arbitrary and could potentially be improved with analysis. */
1229 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1230 count
*= 50; /* FIXME. */
1232 retval
= (unsigned) (count
* stmt_cost
);
1233 cost
[where
] += retval
;
1238 /* By default, the cost model just returns the accumulated costs. */
1241 default_finish_cost (void *data
, unsigned *prologue_cost
,
1242 unsigned *body_cost
, unsigned *epilogue_cost
)
1244 unsigned *cost
= (unsigned *) data
;
1245 *prologue_cost
= cost
[vect_prologue
];
1246 *body_cost
= cost
[vect_body
];
1247 *epilogue_cost
= cost
[vect_epilogue
];
1250 /* Free the cost data. */
1253 default_destroy_cost_data (void *data
)
1258 /* Determine whether or not a pointer mode is valid. Assume defaults
1259 of ptr_mode or Pmode - can be overridden. */
1261 default_valid_pointer_mode (machine_mode mode
)
1263 return (mode
== ptr_mode
|| mode
== Pmode
);
1266 /* Determine whether the memory reference specified by REF may alias
1267 the C libraries errno location. */
1269 default_ref_may_alias_errno (ao_ref
*ref
)
1271 tree base
= ao_ref_base (ref
);
1272 /* The default implementation assumes the errno location is
1273 a declaration of type int or is always accessed via a
1274 pointer to int. We assume that accesses to errno are
1275 not deliberately obfuscated (even in conforming ways). */
1276 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1277 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1279 /* The default implementation assumes an errno location
1280 declaration is never defined in the current compilation unit. */
1282 && !TREE_STATIC (base
))
1284 else if (TREE_CODE (base
) == MEM_REF
1285 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1287 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1288 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1293 /* Return the mode for a pointer to a given ADDRSPACE,
1294 defaulting to ptr_mode for all address spaces. */
1297 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1302 /* Return the mode for an address in a given ADDRSPACE,
1303 defaulting to Pmode for all address spaces. */
1306 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1311 /* Named address space version of valid_pointer_mode.
1312 To match the above, the same modes apply to all address spaces. */
1315 default_addr_space_valid_pointer_mode (machine_mode mode
,
1316 addr_space_t as ATTRIBUTE_UNUSED
)
1318 return targetm
.valid_pointer_mode (mode
);
1321 /* Some places still assume that all pointer or address modes are the
1322 standard Pmode and ptr_mode. These optimizations become invalid if
1323 the target actually supports multiple different modes. For now,
1324 we disable such optimizations on such targets, using this function. */
1327 target_default_pointer_address_modes_p (void)
1329 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1331 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1337 /* Named address space version of legitimate_address_p.
1338 By default, all address spaces have the same form. */
1341 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1343 addr_space_t as ATTRIBUTE_UNUSED
)
1345 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1348 /* Named address space version of LEGITIMIZE_ADDRESS.
1349 By default, all address spaces have the same form. */
1352 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1353 addr_space_t as ATTRIBUTE_UNUSED
)
1355 return targetm
.legitimize_address (x
, oldx
, mode
);
1358 /* The default hook for determining if one named address space is a subset of
1359 another and to return which address space to use as the common address
1363 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1365 return (subset
== superset
);
1368 /* The default hook for determining if 0 within a named address
1369 space is a valid address. */
1372 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1377 /* The default hook for debugging the address space is to return the
1378 address space number to indicate DW_AT_address_class. */
1380 default_addr_space_debug (addr_space_t as
)
1385 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1386 Don't complain about any address space. */
1389 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1394 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1395 called for targets with only a generic address space. */
1398 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1399 tree from_type ATTRIBUTE_UNUSED
,
1400 tree to_type ATTRIBUTE_UNUSED
)
1406 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1411 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1414 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1415 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1421 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1422 tree
ARG_UNUSED (name
),
1423 tree
ARG_UNUSED (args
),
1424 int ARG_UNUSED (flags
))
1426 warning (OPT_Wattributes
,
1427 "target attribute is not supported on this machine");
1433 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1434 tree
ARG_UNUSED (pop_target
))
1436 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1437 emit no warning because "#pragma GCC pop_target" is valid on targets that
1438 do not have the "target" pragma. */
1440 warning (OPT_Wpragmas
,
1441 "#pragma GCC target is not supported for this machine");
1447 default_target_can_inline_p (tree caller
, tree callee
)
1450 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1451 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1453 /* If callee has no option attributes, then it is ok to inline */
1457 /* If caller has no option attributes, but callee does then it is not ok to
1459 else if (!caller_opts
)
1462 /* If both caller and callee have attributes, assume that if the
1463 pointer is different, the two functions have different target
1464 options since build_target_option_node uses a hash table for the
1467 ret
= (callee_opts
== caller_opts
);
1472 /* If the machine does not have a case insn that compares the bounds,
1473 this means extra overhead for dispatch tables, which raises the
1474 threshold for using them. */
1477 default_case_values_threshold (void)
1479 return (targetm
.have_casesi () ? 4 : 5);
1483 default_have_conditional_execution (void)
1485 return HAVE_conditional_execution
;
1488 /* By default we assume that c99 functions are present at the runtime,
1489 but sincos is not. */
1491 default_libc_has_function (enum function_class fn_class
)
1493 if (fn_class
== function_c94
1494 || fn_class
== function_c99_misc
1495 || fn_class
== function_c99_math_complex
)
1502 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1508 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1513 /* Return the format string to which "%p" corresponds. By default,
1514 assume it corresponds to the C99 "%zx" format and set *FLAGS to
1515 the empty string to indicate that format flags have no effect.
1516 An example of an implementation that matches this description
1520 default_printf_pointer_format (tree
, const char **flags
)
1527 /* For Glibc and uClibc targets also define the hook here because
1528 otherwise it would have to be duplicated in each target's .c file
1529 (such as in bfin/bfin.c and c6x/c6x.c, etc.)
1530 Glibc and uClibc format pointers as if by "%zx" except for the null
1531 pointer which outputs "(nil)". It ignores the pound ('#') format
1532 flag but interprets the space and plus flags the same as in the integer
1536 linux_printf_pointer_format (tree arg
, const char **flags
)
1540 return arg
&& integer_zerop (arg
) ? "(nil)" : "%#zx";
1544 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1549 /* Compute cost of moving registers to/from memory. */
1552 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1553 reg_class_t rclass ATTRIBUTE_UNUSED
,
1554 bool in ATTRIBUTE_UNUSED
)
1556 #ifndef MEMORY_MOVE_COST
1557 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1559 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1563 /* Compute cost of moving data from a register of class FROM to one of
1567 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1568 reg_class_t from ATTRIBUTE_UNUSED
,
1569 reg_class_t to ATTRIBUTE_UNUSED
)
1571 #ifndef REGISTER_MOVE_COST
1574 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1578 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1579 behavior. SPEED_P is true if we are compiling for speed. */
1582 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1584 unsigned int move_ratio
;
1586 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1588 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1590 #else /* No movmem patterns, pick a default. */
1591 move_ratio
= ((speed_p
) ? 15 : 3);
1597 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1598 used; return FALSE if the movmem/setmem optab should be expanded, or
1599 a call to memcpy emitted. */
1602 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1603 unsigned int alignment
,
1604 enum by_pieces_operation op
,
1607 unsigned int max_size
= 0;
1608 unsigned int ratio
= 0;
1612 case CLEAR_BY_PIECES
:
1613 max_size
= STORE_MAX_PIECES
;
1614 ratio
= CLEAR_RATIO (speed_p
);
1616 case MOVE_BY_PIECES
:
1617 max_size
= MOVE_MAX_PIECES
;
1618 ratio
= get_move_ratio (speed_p
);
1621 max_size
= STORE_MAX_PIECES
;
1622 ratio
= SET_RATIO (speed_p
);
1624 case STORE_BY_PIECES
:
1625 max_size
= STORE_MAX_PIECES
;
1626 ratio
= get_move_ratio (speed_p
);
1628 case COMPARE_BY_PIECES
:
1629 max_size
= COMPARE_MAX_PIECES
;
1630 /* Pick a likely default, just as in get_move_ratio. */
1631 ratio
= speed_p
? 15 : 3;
1635 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1638 /* This hook controls code generation for expanding a memcmp operation by
1639 pieces. Return 1 for the normal pattern of compare/jump after each pair
1640 of loads, or a higher number to reduce the number of branches. */
1643 default_compare_by_pieces_branch_ratio (machine_mode
)
1649 default_profile_before_prologue (void)
1651 #ifdef PROFILE_BEFORE_PROLOGUE
1658 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1661 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1664 #ifdef PREFERRED_RELOAD_CLASS
1665 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1671 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1674 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1680 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1682 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1687 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1690 default_class_likely_spilled_p (reg_class_t rclass
)
1692 return (reg_class_size
[(int) rclass
] == 1);
1695 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1698 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1699 machine_mode mode ATTRIBUTE_UNUSED
)
1701 #ifdef CLASS_MAX_NREGS
1702 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1704 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1708 /* Determine the debugging unwind mechanism for the target. */
1710 enum unwind_info_type
1711 default_debug_unwind_info (void)
1713 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1714 /* ??? Change all users to the hook, then poison this. */
1715 #ifdef DWARF2_FRAME_INFO
1716 if (DWARF2_FRAME_INFO
)
1720 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1721 #ifdef DWARF2_DEBUGGING_INFO
1722 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1729 /* Determine the correct mode for a Dwarf frame register that represents
1733 default_dwarf_frame_reg_mode (int regno
)
1735 machine_mode save_mode
= reg_raw_mode
[regno
];
1737 if (HARD_REGNO_CALL_PART_CLOBBERED (regno
, save_mode
))
1738 save_mode
= choose_hard_reg_mode (regno
, 1, true);
1742 /* To be used by targets where reg_raw_mode doesn't return the right
1743 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1746 default_get_reg_raw_mode (int regno
)
1748 return reg_raw_mode
[regno
];
1751 /* Return true if a leaf function should stay leaf even with profiling
1755 default_keep_leaf_when_profiled ()
1760 /* Return true if the state of option OPTION should be stored in PCH files
1761 and checked by default_pch_valid_p. Store the option's current state
1765 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1767 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1769 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1771 if (option_flag_var (option
, &global_options
) == &target_flags
)
1772 if (targetm
.check_pch_target_flags
)
1774 return get_option_state (&global_options
, option
, state
);
1777 /* Default version of get_pch_validity.
1778 By default, every flag difference is fatal; that will be mostly right for
1779 most targets, but completely right for very few. */
1782 default_get_pch_validity (size_t *sz
)
1784 struct cl_option_state state
;
1789 if (targetm
.check_pch_target_flags
)
1790 *sz
+= sizeof (target_flags
);
1791 for (i
= 0; i
< cl_options_count
; i
++)
1792 if (option_affects_pch_p (i
, &state
))
1795 result
= r
= XNEWVEC (char, *sz
);
1799 if (targetm
.check_pch_target_flags
)
1801 memcpy (r
, &target_flags
, sizeof (target_flags
));
1802 r
+= sizeof (target_flags
);
1805 for (i
= 0; i
< cl_options_count
; i
++)
1806 if (option_affects_pch_p (i
, &state
))
1808 memcpy (r
, state
.data
, state
.size
);
1815 /* Return a message which says that a PCH file was created with a different
1816 setting of OPTION. */
1819 pch_option_mismatch (const char *option
)
1821 return xasprintf (_("created and used with differing settings of '%s'"),
1825 /* Default version of pch_valid_p. */
1828 default_pch_valid_p (const void *data_p
, size_t len
)
1830 struct cl_option_state state
;
1831 const char *data
= (const char *)data_p
;
1834 /* -fpic and -fpie also usually make a PCH invalid. */
1835 if (data
[0] != flag_pic
)
1836 return _("created and used with different settings of -fpic");
1837 if (data
[1] != flag_pie
)
1838 return _("created and used with different settings of -fpie");
1841 /* Check target_flags. */
1842 if (targetm
.check_pch_target_flags
)
1847 memcpy (&tf
, data
, sizeof (target_flags
));
1848 data
+= sizeof (target_flags
);
1849 len
-= sizeof (target_flags
);
1850 r
= targetm
.check_pch_target_flags (tf
);
1855 for (i
= 0; i
< cl_options_count
; i
++)
1856 if (option_affects_pch_p (i
, &state
))
1858 if (memcmp (data
, state
.data
, state
.size
) != 0)
1859 return pch_option_mismatch (cl_options
[i
].opt_text
);
1867 /* Default version of cstore_mode. */
1870 default_cstore_mode (enum insn_code icode
)
1872 return insn_data
[(int) icode
].operand
[0].mode
;
1875 /* Default version of member_type_forces_blk. */
1878 default_member_type_forces_blk (const_tree
, machine_mode
)
1884 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
1885 rtx ptr ATTRIBUTE_UNUSED
,
1886 rtx bnd ATTRIBUTE_UNUSED
)
1892 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
1893 rtx addr ATTRIBUTE_UNUSED
,
1894 rtx bounds ATTRIBUTE_UNUSED
,
1895 rtx to ATTRIBUTE_UNUSED
)
1901 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
1907 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
1908 rtx bounds ATTRIBUTE_UNUSED
)
1913 /* Default version of canonicalize_comparison. */
1916 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1920 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
1923 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
1927 #ifndef PAD_VARARGS_DOWN
1928 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
1931 /* Build an indirect-ref expression over the given TREE, which represents a
1932 piece of a va_arg() expansion. */
1934 build_va_arg_indirect_ref (tree addr
)
1936 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
1940 /* The "standard" implementation of va_arg: read the value from the
1941 current (padded) address and increment by the (padded) size. */
1944 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
1947 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
1948 unsigned HOST_WIDE_INT align
, boundary
;
1951 /* All of the alignment and movement below is for args-grow-up machines.
1952 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
1953 implement their own specialized gimplify_va_arg_expr routines. */
1954 if (ARGS_GROW_DOWNWARD
)
1957 indirect
= pass_by_reference (NULL
, TYPE_MODE (type
), type
, false);
1959 type
= build_pointer_type (type
);
1961 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
1962 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
1964 /* When we align parameter on stack for caller, if the parameter
1965 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
1966 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
1967 here with caller. */
1968 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
1969 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
1971 boundary
/= BITS_PER_UNIT
;
1973 /* Hoist the valist value into a temporary for the moment. */
1974 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
1976 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
1977 requires greater alignment, we must perform dynamic alignment. */
1978 if (boundary
> align
1979 && !integer_zerop (TYPE_SIZE (type
)))
1981 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1982 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
1983 gimplify_and_add (t
, pre_p
);
1985 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1986 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
1988 build_int_cst (TREE_TYPE (valist
), -boundary
)));
1989 gimplify_and_add (t
, pre_p
);
1994 /* If the actual alignment is less than the alignment of the type,
1995 adjust the type accordingly so that we don't assume strict alignment
1996 when dereferencing the pointer. */
1997 boundary
*= BITS_PER_UNIT
;
1998 if (boundary
< TYPE_ALIGN (type
))
2000 type
= build_variant_type_copy (type
);
2001 SET_TYPE_ALIGN (type
, boundary
);
2004 /* Compute the rounded size of the type. */
2005 type_size
= size_in_bytes (type
);
2006 rounded_size
= round_up (type_size
, align
);
2008 /* Reduce rounded_size so it's sharable with the postqueue. */
2009 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2013 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2015 /* Small args are padded downward. */
2016 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2017 rounded_size
, size_int (align
));
2018 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2019 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2020 addr
= fold_build_pointer_plus (addr
, t
);
2023 /* Compute new value for AP. */
2024 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2025 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2026 gimplify_and_add (t
, pre_p
);
2028 addr
= fold_convert (build_pointer_type (type
), addr
);
2031 addr
= build_va_arg_indirect_ref (addr
);
2033 return build_va_arg_indirect_ref (addr
);
2037 default_chkp_bound_type (void)
2039 tree res
= make_node (POINTER_BOUNDS_TYPE
);
2040 TYPE_PRECISION (res
) = TYPE_PRECISION (size_type_node
) * 2;
2041 TYPE_NAME (res
) = get_identifier ("__bounds_type");
2042 SET_TYPE_MODE (res
, targetm
.chkp_bound_mode ());
2048 default_chkp_bound_mode (void)
2054 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED
)
2060 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED
,
2061 const_tree fn_decl_or_type ATTRIBUTE_UNUSED
,
2062 bool outgoing ATTRIBUTE_UNUSED
)
2068 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED
,
2069 HOST_WIDE_INT ub ATTRIBUTE_UNUSED
)
2075 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED
,
2076 tree lb ATTRIBUTE_UNUSED
,
2077 tree ub ATTRIBUTE_UNUSED
,
2078 tree
*stmts ATTRIBUTE_UNUSED
)
2084 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED
,
2085 enum machine_mode mode ATTRIBUTE_UNUSED
,
2086 tree type ATTRIBUTE_UNUSED
,
2087 int *pretend_arg_size ATTRIBUTE_UNUSED
,
2088 int second_time ATTRIBUTE_UNUSED
)
2092 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2093 not support nested low-overhead loops. */
2096 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2097 unsigned int loop_depth
, bool)
2099 return loop_depth
== 1;
2102 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2105 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2110 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2113 default_max_noce_ifcvt_seq_cost (edge e
)
2115 bool predictable_p
= predictable_edge_p (e
);
2117 enum compiler_param param
2119 ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2120 : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST
);
2122 /* If we have a parameter set, use that, otherwise take a guess using
2124 if (global_options_set
.x_param_values
[param
])
2125 return PARAM_VALUE (param
);
2127 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2130 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2133 default_min_arithmetic_precision (void)
2135 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2138 #include "gt-targhooks.h"