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 (machine_mode mode ATTRIBUTE_UNUSED
,
263 machine_mode mode_rep ATTRIBUTE_UNUSED
)
268 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
271 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
276 /* Return machine mode for non-standard suffix
277 or VOIDmode if non-standard suffixes are unsupported. */
279 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
284 /* The generic C++ ABI specifies this is a 64-bit value. */
286 default_cxx_guard_type (void)
288 return long_long_integer_type_node
;
291 /* Returns the size of the cookie to use when allocating an array
292 whose elements have the indicated TYPE. Assumes that it is already
293 known that a cookie is needed. */
296 default_cxx_get_cookie_size (tree type
)
300 /* We need to allocate an additional max (sizeof (size_t), alignof
301 (true_type)) bytes. */
305 sizetype_size
= size_in_bytes (sizetype
);
306 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
307 if (tree_int_cst_lt (type_align
, sizetype_size
))
308 cookie_size
= sizetype_size
;
310 cookie_size
= type_align
;
315 /* Return true if a parameter must be passed by reference. This version
316 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
319 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED
,
320 machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
321 bool named_arg ATTRIBUTE_UNUSED
)
323 return targetm
.calls
.must_pass_in_stack (mode
, type
);
326 /* Return true if a parameter follows callee copies conventions. This
327 version of the hook is true for all named arguments. */
330 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED
,
331 machine_mode mode ATTRIBUTE_UNUSED
,
332 const_tree type ATTRIBUTE_UNUSED
, bool named
)
337 /* Emit to STREAM the assembler syntax for insn operand X. */
340 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
341 int code ATTRIBUTE_UNUSED
)
344 PRINT_OPERAND (stream
, x
, code
);
350 /* Emit to STREAM the assembler syntax for an insn operand whose memory
354 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
355 machine_mode
/*mode*/,
356 rtx x ATTRIBUTE_UNUSED
)
358 #ifdef PRINT_OPERAND_ADDRESS
359 PRINT_OPERAND_ADDRESS (stream
, x
);
365 /* Return true if CODE is a valid punctuation character for the
366 `print_operand' hook. */
369 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
371 #ifdef PRINT_OPERAND_PUNCT_VALID_P
372 return PRINT_OPERAND_PUNCT_VALID_P (code
);
378 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
380 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
382 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
383 const char *stripped
= targetm
.strip_name_encoding (skipped
);
384 if (*name
!= '*' && user_label_prefix
[0])
385 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
386 return get_identifier (stripped
);
389 /* True if MODE is valid for the target. By "valid", we mean able to
390 be manipulated in non-trivial ways. In particular, this means all
391 the arithmetic is supported.
393 By default we guess this means that any C type is supported. If
394 we can't map the mode back to a type that would be available in C,
395 then reject it. Special case, here, is the double-word arithmetic
396 supported by optabs.c. */
399 default_scalar_mode_supported_p (machine_mode mode
)
401 int precision
= GET_MODE_PRECISION (mode
);
403 switch (GET_MODE_CLASS (mode
))
405 case MODE_PARTIAL_INT
:
407 if (precision
== CHAR_TYPE_SIZE
)
409 if (precision
== SHORT_TYPE_SIZE
)
411 if (precision
== INT_TYPE_SIZE
)
413 if (precision
== LONG_TYPE_SIZE
)
415 if (precision
== LONG_LONG_TYPE_SIZE
)
417 if (precision
== 2 * BITS_PER_WORD
)
422 if (precision
== FLOAT_TYPE_SIZE
)
424 if (precision
== DOUBLE_TYPE_SIZE
)
426 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
430 case MODE_DECIMAL_FLOAT
:
442 /* Return true if libgcc supports floating-point mode MODE (known to
443 be supported as a scalar mode). */
446 default_libgcc_floating_mode_supported_p (machine_mode mode
)
469 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
470 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
473 default_floatn_mode (int n
, bool extended
)
477 machine_mode cand1
= VOIDmode
, cand2
= VOIDmode
;
499 /* Those are the only valid _FloatNx types. */
502 if (cand1
!= VOIDmode
503 && REAL_MODE_FORMAT (cand1
)->ieee_bits
> n
504 && targetm
.scalar_mode_supported_p (cand1
)
505 && targetm
.libgcc_floating_mode_supported_p (cand1
))
507 if (cand2
!= VOIDmode
508 && REAL_MODE_FORMAT (cand2
)->ieee_bits
> n
509 && targetm
.scalar_mode_supported_p (cand2
)
510 && targetm
.libgcc_floating_mode_supported_p (cand2
))
515 machine_mode cand
= VOIDmode
;
519 /* Always enable _Float16 if we have basic support for the mode.
520 Targets can control the range and precision of operations on
521 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
549 && REAL_MODE_FORMAT (cand
)->ieee_bits
== n
550 && targetm
.scalar_mode_supported_p (cand
)
551 && targetm
.libgcc_floating_mode_supported_p (cand
))
557 /* Make some target macros useable by target-independent code. */
559 targhook_words_big_endian (void)
561 return !!WORDS_BIG_ENDIAN
;
565 targhook_float_words_big_endian (void)
567 return !!FLOAT_WORDS_BIG_ENDIAN
;
570 /* True if the target supports floating-point exceptions and rounding
574 default_float_exceptions_rounding_supported_p (void)
583 /* True if the target supports decimal floating point. */
586 default_decimal_float_supported_p (void)
588 return ENABLE_DECIMAL_FLOAT
;
591 /* True if the target supports fixed-point arithmetic. */
594 default_fixed_point_supported_p (void)
596 return ENABLE_FIXED_POINT
;
599 /* True if the target supports GNU indirect functions. */
602 default_has_ifunc_p (void)
604 return HAVE_GNU_INDIRECT_FUNCTION
;
607 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
610 This function checks whether a given INSN is valid within a low-overhead
611 loop. If INSN is invalid it returns the reason for that, otherwise it
612 returns NULL. A called function may clobber any special registers required
613 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
614 register for branch on table instructions. We reject the doloop pattern in
618 default_invalid_within_doloop (const rtx_insn
*insn
)
621 return "Function call in loop.";
623 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
624 return "Computed branch in the loop.";
629 /* Mapping of builtin functions to vectorized variants. */
632 default_builtin_vectorized_function (unsigned int, tree
, tree
)
637 /* Mapping of target builtin functions to vectorized variants. */
640 default_builtin_md_vectorized_function (tree
, tree
, tree
)
645 /* Vectorized conversion. */
648 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
649 tree dest_type ATTRIBUTE_UNUSED
,
650 tree src_type ATTRIBUTE_UNUSED
)
655 /* Default vectorizer cost model values. */
658 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
660 int misalign ATTRIBUTE_UNUSED
)
662 switch (type_of_cost
)
672 case cond_branch_not_taken
:
674 case vec_promote_demote
:
678 case unaligned_store
:
681 case cond_branch_taken
:
685 return TYPE_VECTOR_SUBPARTS (vectype
) - 1;
695 default_builtin_reciprocal (tree
)
701 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
702 cumulative_args_t ca ATTRIBUTE_UNUSED
,
703 machine_mode mode ATTRIBUTE_UNUSED
,
704 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
710 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
711 cumulative_args_t ca ATTRIBUTE_UNUSED
,
712 machine_mode mode ATTRIBUTE_UNUSED
,
713 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
719 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
720 cumulative_args_t ca ATTRIBUTE_UNUSED
,
721 machine_mode mode ATTRIBUTE_UNUSED
,
722 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
728 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
729 machine_mode mode ATTRIBUTE_UNUSED
,
730 const_tree type ATTRIBUTE_UNUSED
,
731 bool named ATTRIBUTE_UNUSED
)
737 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
738 machine_mode mode ATTRIBUTE_UNUSED
,
739 const_tree type ATTRIBUTE_UNUSED
,
740 bool named ATTRIBUTE_UNUSED
)
746 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
747 machine_mode mode ATTRIBUTE_UNUSED
,
748 const_tree type ATTRIBUTE_UNUSED
,
749 bool named ATTRIBUTE_UNUSED
)
755 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
756 const_tree type ATTRIBUTE_UNUSED
)
758 return PARM_BOUNDARY
;
762 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
763 const_tree type ATTRIBUTE_UNUSED
)
765 return PARM_BOUNDARY
;
769 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
774 hook_invalid_arg_for_unprototyped_fn (
775 const_tree typelist ATTRIBUTE_UNUSED
,
776 const_tree funcdecl ATTRIBUTE_UNUSED
,
777 const_tree val ATTRIBUTE_UNUSED
)
782 /* Initialize the stack protection decls. */
784 /* Stack protection related decls living in libgcc. */
785 static GTY(()) tree stack_chk_guard_decl
;
788 default_stack_protect_guard (void)
790 tree t
= stack_chk_guard_decl
;
796 t
= build_decl (UNKNOWN_LOCATION
,
797 VAR_DECL
, get_identifier ("__stack_chk_guard"),
801 DECL_EXTERNAL (t
) = 1;
803 TREE_THIS_VOLATILE (t
) = 1;
804 DECL_ARTIFICIAL (t
) = 1;
805 DECL_IGNORED_P (t
) = 1;
807 /* Do not share RTL as the declaration is visible outside of
810 RTX_FLAG (x
, used
) = 1;
812 stack_chk_guard_decl
= t
;
818 static GTY(()) tree stack_chk_fail_decl
;
821 default_external_stack_protect_fail (void)
823 tree t
= stack_chk_fail_decl
;
827 t
= build_function_type_list (void_type_node
, NULL_TREE
);
828 t
= build_decl (UNKNOWN_LOCATION
,
829 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
832 DECL_EXTERNAL (t
) = 1;
834 TREE_THIS_VOLATILE (t
) = 1;
835 TREE_NOTHROW (t
) = 1;
836 DECL_ARTIFICIAL (t
) = 1;
837 DECL_IGNORED_P (t
) = 1;
838 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
839 DECL_VISIBILITY_SPECIFIED (t
) = 1;
841 stack_chk_fail_decl
= t
;
844 return build_call_expr (t
, 0);
848 default_hidden_stack_protect_fail (void)
850 #ifndef HAVE_GAS_HIDDEN
851 return default_external_stack_protect_fail ();
853 tree t
= stack_chk_fail_decl
;
856 return default_external_stack_protect_fail ();
860 t
= build_function_type_list (void_type_node
, NULL_TREE
);
861 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
862 get_identifier ("__stack_chk_fail_local"), t
);
865 DECL_EXTERNAL (t
) = 1;
867 TREE_THIS_VOLATILE (t
) = 1;
868 TREE_NOTHROW (t
) = 1;
869 DECL_ARTIFICIAL (t
) = 1;
870 DECL_IGNORED_P (t
) = 1;
871 DECL_VISIBILITY_SPECIFIED (t
) = 1;
872 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
874 stack_chk_fail_decl
= t
;
877 return build_call_expr (t
, 0);
882 hook_bool_const_rtx_commutative_p (const_rtx x
,
883 int outer_code ATTRIBUTE_UNUSED
)
885 return COMMUTATIVE_P (x
);
889 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
890 const_tree fn_decl_or_type
,
891 bool outgoing ATTRIBUTE_UNUSED
)
893 /* The old interface doesn't handle receiving the function type. */
895 && !DECL_P (fn_decl_or_type
))
896 fn_decl_or_type
= NULL
;
898 #ifdef FUNCTION_VALUE
899 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
906 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
907 const_rtx fun ATTRIBUTE_UNUSED
)
910 return LIBCALL_VALUE (mode
);
916 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
919 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
921 #ifdef FUNCTION_VALUE_REGNO_P
922 return FUNCTION_VALUE_REGNO_P (regno
);
929 default_internal_arg_pointer (void)
931 /* If the reg that the virtual arg pointer will be translated into is
932 not a fixed reg or is the stack pointer, make a copy of the virtual
933 arg pointer, and address parms via the copy. The frame pointer is
934 considered fixed even though it is not marked as such. */
935 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
936 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
937 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
938 return copy_to_reg (virtual_incoming_args_rtx
);
940 return virtual_incoming_args_rtx
;
944 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
948 #ifdef STATIC_CHAIN_INCOMING_REGNUM
949 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
953 #ifdef STATIC_CHAIN_REGNUM
954 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
958 static bool issued_error
;
962 sorry ("nested functions not supported on this target");
965 /* It really doesn't matter what we return here, so long at it
966 doesn't cause the rest of the compiler to crash. */
967 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
972 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
973 rtx
ARG_UNUSED (r_chain
))
975 sorry ("nested function trampolines not supported on this target");
979 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
980 tree funtype ATTRIBUTE_UNUSED
,
981 int size ATTRIBUTE_UNUSED
)
987 default_branch_target_register_class (void)
993 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
995 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1001 default_lra_p (void)
1007 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1013 default_register_usage_leveling_p (void)
1019 default_different_addr_displacement_p (void)
1025 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1026 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1027 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1028 secondary_reload_info
*sri
)
1030 enum reg_class rclass
= NO_REGS
;
1031 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1033 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1035 sri
->icode
= sri
->prev_sri
->t_icode
;
1038 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1040 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
1042 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1044 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
1046 if (rclass
!= NO_REGS
)
1048 enum insn_code icode
1049 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1052 if (icode
!= CODE_FOR_nothing
1053 && !insn_operand_matches (icode
, in_p
, x
))
1054 icode
= CODE_FOR_nothing
;
1055 else if (icode
!= CODE_FOR_nothing
)
1057 const char *insn_constraint
, *scratch_constraint
;
1058 enum reg_class insn_class
, scratch_class
;
1060 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1061 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1062 if (!*insn_constraint
)
1063 insn_class
= ALL_REGS
;
1068 gcc_assert (*insn_constraint
== '=');
1071 insn_class
= (reg_class_for_constraint
1072 (lookup_constraint (insn_constraint
)));
1073 gcc_assert (insn_class
!= NO_REGS
);
1076 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1077 /* The scratch register's constraint must start with "=&",
1078 except for an input reload, where only "=" is necessary,
1079 and where it might be beneficial to re-use registers from
1081 gcc_assert (scratch_constraint
[0] == '='
1082 && (in_p
|| scratch_constraint
[1] == '&'));
1083 scratch_constraint
++;
1084 if (*scratch_constraint
== '&')
1085 scratch_constraint
++;
1086 scratch_class
= (reg_class_for_constraint
1087 (lookup_constraint (scratch_constraint
)));
1089 if (reg_class_subset_p (reload_class
, insn_class
))
1091 gcc_assert (scratch_class
== rclass
);
1095 rclass
= insn_class
;
1098 if (rclass
== NO_REGS
)
1101 sri
->t_icode
= icode
;
1106 /* By default, if flag_pic is true, then neither local nor global relocs
1107 should be placed in readonly memory. */
1110 default_reloc_rw_mask (void)
1112 return flag_pic
? 3 : 0;
1115 /* By default, do no modification. */
1116 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1122 /* Default to natural alignment for vector types. */
1124 default_vector_alignment (const_tree type
)
1126 HOST_WIDE_INT align
= tree_to_shwi (TYPE_SIZE (type
));
1127 if (align
> MAX_OFILE_ALIGNMENT
)
1128 align
= MAX_OFILE_ALIGNMENT
;
1132 /* By default assume vectors of element TYPE require a multiple of the natural
1133 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1135 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1140 /* By default, assume that a target supports any factor of misalignment
1141 memory access if it supports movmisalign patten.
1142 is_packed is true if the memory access is defined in a packed struct. */
1144 default_builtin_support_vector_misalignment (machine_mode mode
,
1152 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1157 /* By default, only attempt to parallelize bitwise operations, and
1158 possibly adds/subtracts using bit-twiddling. */
1161 default_preferred_simd_mode (machine_mode mode ATTRIBUTE_UNUSED
)
1166 /* By default only the size derived from the preferred vector mode
1170 default_autovectorize_vector_sizes (void)
1175 /* By defaults a vector of integers is used as a mask. */
1178 default_get_mask_mode (unsigned nunits
, unsigned vector_size
)
1180 unsigned elem_size
= vector_size
/ nunits
;
1181 machine_mode elem_mode
1182 = smallest_mode_for_size (elem_size
* BITS_PER_UNIT
, MODE_INT
);
1183 machine_mode vector_mode
;
1185 gcc_assert (elem_size
* nunits
== vector_size
);
1187 vector_mode
= mode_for_vector (elem_mode
, nunits
);
1188 if (!VECTOR_MODE_P (vector_mode
)
1189 || !targetm
.vector_mode_supported_p (vector_mode
))
1190 vector_mode
= BLKmode
;
1195 /* By default, the cost model accumulates three separate costs (prologue,
1196 loop body, and epilogue) for a vectorized loop or block. So allocate an
1197 array of three unsigned ints, set it to zero, and return its address. */
1200 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1202 unsigned *cost
= XNEWVEC (unsigned, 3);
1203 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1207 /* By default, the cost model looks up the cost of the given statement
1208 kind and mode, multiplies it by the occurrence count, accumulates
1209 it into the cost specified by WHERE, and returns the cost added. */
1212 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1213 struct _stmt_vec_info
*stmt_info
, int misalign
,
1214 enum vect_cost_model_location where
)
1216 unsigned *cost
= (unsigned *) data
;
1217 unsigned retval
= 0;
1219 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1220 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1222 /* Statements in an inner loop relative to the loop being
1223 vectorized are weighted more heavily. The value here is
1224 arbitrary and could potentially be improved with analysis. */
1225 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1226 count
*= 50; /* FIXME. */
1228 retval
= (unsigned) (count
* stmt_cost
);
1229 cost
[where
] += retval
;
1234 /* By default, the cost model just returns the accumulated costs. */
1237 default_finish_cost (void *data
, unsigned *prologue_cost
,
1238 unsigned *body_cost
, unsigned *epilogue_cost
)
1240 unsigned *cost
= (unsigned *) data
;
1241 *prologue_cost
= cost
[vect_prologue
];
1242 *body_cost
= cost
[vect_body
];
1243 *epilogue_cost
= cost
[vect_epilogue
];
1246 /* Free the cost data. */
1249 default_destroy_cost_data (void *data
)
1254 /* Determine whether or not a pointer mode is valid. Assume defaults
1255 of ptr_mode or Pmode - can be overridden. */
1257 default_valid_pointer_mode (machine_mode mode
)
1259 return (mode
== ptr_mode
|| mode
== Pmode
);
1262 /* Determine whether the memory reference specified by REF may alias
1263 the C libraries errno location. */
1265 default_ref_may_alias_errno (ao_ref
*ref
)
1267 tree base
= ao_ref_base (ref
);
1268 /* The default implementation assumes the errno location is
1269 a declaration of type int or is always accessed via a
1270 pointer to int. We assume that accesses to errno are
1271 not deliberately obfuscated (even in conforming ways). */
1272 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1273 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1275 /* The default implementation assumes an errno location
1276 declaration is never defined in the current compilation unit. */
1278 && !TREE_STATIC (base
))
1280 else if (TREE_CODE (base
) == MEM_REF
1281 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1283 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1284 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1289 /* Return the mode for a pointer to a given ADDRSPACE,
1290 defaulting to ptr_mode for all address spaces. */
1293 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1298 /* Return the mode for an address in a given ADDRSPACE,
1299 defaulting to Pmode for all address spaces. */
1302 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1307 /* Named address space version of valid_pointer_mode.
1308 To match the above, the same modes apply to all address spaces. */
1311 default_addr_space_valid_pointer_mode (machine_mode mode
,
1312 addr_space_t as ATTRIBUTE_UNUSED
)
1314 return targetm
.valid_pointer_mode (mode
);
1317 /* Some places still assume that all pointer or address modes are the
1318 standard Pmode and ptr_mode. These optimizations become invalid if
1319 the target actually supports multiple different modes. For now,
1320 we disable such optimizations on such targets, using this function. */
1323 target_default_pointer_address_modes_p (void)
1325 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1327 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1333 /* Named address space version of legitimate_address_p.
1334 By default, all address spaces have the same form. */
1337 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1339 addr_space_t as ATTRIBUTE_UNUSED
)
1341 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1344 /* Named address space version of LEGITIMIZE_ADDRESS.
1345 By default, all address spaces have the same form. */
1348 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1349 addr_space_t as ATTRIBUTE_UNUSED
)
1351 return targetm
.legitimize_address (x
, oldx
, mode
);
1354 /* The default hook for determining if one named address space is a subset of
1355 another and to return which address space to use as the common address
1359 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1361 return (subset
== superset
);
1364 /* The default hook for determining if 0 within a named address
1365 space is a valid address. */
1368 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1373 /* The default hook for debugging the address space is to return the
1374 address space number to indicate DW_AT_address_class. */
1376 default_addr_space_debug (addr_space_t as
)
1381 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1382 Don't complain about any address space. */
1385 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1390 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1391 called for targets with only a generic address space. */
1394 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1395 tree from_type ATTRIBUTE_UNUSED
,
1396 tree to_type ATTRIBUTE_UNUSED
)
1402 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1407 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1410 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1411 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1417 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1418 tree
ARG_UNUSED (name
),
1419 tree
ARG_UNUSED (args
),
1420 int ARG_UNUSED (flags
))
1422 warning (OPT_Wattributes
,
1423 "target attribute is not supported on this machine");
1429 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1430 tree
ARG_UNUSED (pop_target
))
1432 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1433 emit no warning because "#pragma GCC pop_target" is valid on targets that
1434 do not have the "target" pragma. */
1436 warning (OPT_Wpragmas
,
1437 "#pragma GCC target is not supported for this machine");
1443 default_target_can_inline_p (tree caller
, tree callee
)
1445 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1446 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1448 callee_opts
= target_option_default_node
;
1450 caller_opts
= target_option_default_node
;
1452 /* If both caller and callee have attributes, assume that if the
1453 pointer is different, the two functions have different target
1454 options since build_target_option_node uses a hash table for the
1456 return callee_opts
== caller_opts
;
1459 /* If the machine does not have a case insn that compares the bounds,
1460 this means extra overhead for dispatch tables, which raises the
1461 threshold for using them. */
1464 default_case_values_threshold (void)
1466 return (targetm
.have_casesi () ? 4 : 5);
1470 default_have_conditional_execution (void)
1472 return HAVE_conditional_execution
;
1475 /* By default we assume that c99 functions are present at the runtime,
1476 but sincos is not. */
1478 default_libc_has_function (enum function_class fn_class
)
1480 if (fn_class
== function_c94
1481 || fn_class
== function_c99_misc
1482 || fn_class
== function_c99_math_complex
)
1489 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1495 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1501 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1506 /* Compute cost of moving registers to/from memory. */
1509 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1510 reg_class_t rclass ATTRIBUTE_UNUSED
,
1511 bool in ATTRIBUTE_UNUSED
)
1513 #ifndef MEMORY_MOVE_COST
1514 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1516 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1520 /* Compute cost of moving data from a register of class FROM to one of
1524 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1525 reg_class_t from ATTRIBUTE_UNUSED
,
1526 reg_class_t to ATTRIBUTE_UNUSED
)
1528 #ifndef REGISTER_MOVE_COST
1531 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1535 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1536 behavior. SPEED_P is true if we are compiling for speed. */
1539 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1541 unsigned int move_ratio
;
1543 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1545 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1547 #else /* No movmem patterns, pick a default. */
1548 move_ratio
= ((speed_p
) ? 15 : 3);
1554 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1555 used; return FALSE if the movmem/setmem optab should be expanded, or
1556 a call to memcpy emitted. */
1559 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1560 unsigned int alignment
,
1561 enum by_pieces_operation op
,
1564 unsigned int max_size
= 0;
1565 unsigned int ratio
= 0;
1569 case CLEAR_BY_PIECES
:
1570 max_size
= STORE_MAX_PIECES
;
1571 ratio
= CLEAR_RATIO (speed_p
);
1573 case MOVE_BY_PIECES
:
1574 max_size
= MOVE_MAX_PIECES
;
1575 ratio
= get_move_ratio (speed_p
);
1578 max_size
= STORE_MAX_PIECES
;
1579 ratio
= SET_RATIO (speed_p
);
1581 case STORE_BY_PIECES
:
1582 max_size
= STORE_MAX_PIECES
;
1583 ratio
= get_move_ratio (speed_p
);
1585 case COMPARE_BY_PIECES
:
1586 max_size
= COMPARE_MAX_PIECES
;
1587 /* Pick a likely default, just as in get_move_ratio. */
1588 ratio
= speed_p
? 15 : 3;
1592 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1595 /* This hook controls code generation for expanding a memcmp operation by
1596 pieces. Return 1 for the normal pattern of compare/jump after each pair
1597 of loads, or a higher number to reduce the number of branches. */
1600 default_compare_by_pieces_branch_ratio (machine_mode
)
1605 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1606 entry. If RECORD_P is true and the target supports named sections,
1607 the location of the NOPs will be recorded in a special object section
1608 called "__patchable_function_entries". This routine may be called
1609 twice per function to put NOPs before and after the function
1613 default_print_patchable_function_entry (FILE *file
,
1614 unsigned HOST_WIDE_INT patch_area_size
,
1617 const char *nop_templ
= 0;
1619 rtx_insn
*my_nop
= make_insn_raw (gen_nop ());
1621 /* We use the template alone, relying on the (currently sane) assumption
1622 that the NOP template does not have variable operands. */
1623 code_num
= recog_memoized (my_nop
);
1624 nop_templ
= get_insn_template (code_num
, my_nop
);
1626 if (record_p
&& targetm_common
.have_named_sections
)
1629 static int patch_area_number
;
1630 section
*previous_section
= in_section
;
1632 patch_area_number
++;
1633 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE", patch_area_number
);
1635 switch_to_section (get_section ("__patchable_function_entries",
1637 fputs (integer_asm_op (POINTER_SIZE_UNITS
, false), file
);
1638 assemble_name_raw (file
, buf
);
1641 switch_to_section (previous_section
);
1642 ASM_OUTPUT_LABEL (file
, buf
);
1646 for (i
= 0; i
< patch_area_size
; ++i
)
1647 fprintf (file
, "\t%s\n", nop_templ
);
1651 default_profile_before_prologue (void)
1653 #ifdef PROFILE_BEFORE_PROLOGUE
1660 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1663 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1666 #ifdef PREFERRED_RELOAD_CLASS
1667 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1673 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1676 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1682 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1684 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1689 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1692 default_class_likely_spilled_p (reg_class_t rclass
)
1694 return (reg_class_size
[(int) rclass
] == 1);
1697 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1700 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1701 machine_mode mode ATTRIBUTE_UNUSED
)
1703 #ifdef CLASS_MAX_NREGS
1704 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1706 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1710 /* Determine the debugging unwind mechanism for the target. */
1712 enum unwind_info_type
1713 default_debug_unwind_info (void)
1715 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1716 /* ??? Change all users to the hook, then poison this. */
1717 #ifdef DWARF2_FRAME_INFO
1718 if (DWARF2_FRAME_INFO
)
1722 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1723 #ifdef DWARF2_DEBUGGING_INFO
1724 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1731 /* Determine the correct mode for a Dwarf frame register that represents
1735 default_dwarf_frame_reg_mode (int regno
)
1737 machine_mode save_mode
= reg_raw_mode
[regno
];
1739 if (HARD_REGNO_CALL_PART_CLOBBERED (regno
, save_mode
))
1740 save_mode
= choose_hard_reg_mode (regno
, 1, true);
1744 /* To be used by targets where reg_raw_mode doesn't return the right
1745 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1748 default_get_reg_raw_mode (int regno
)
1750 return reg_raw_mode
[regno
];
1753 /* Return true if a leaf function should stay leaf even with profiling
1757 default_keep_leaf_when_profiled ()
1762 /* Return true if the state of option OPTION should be stored in PCH files
1763 and checked by default_pch_valid_p. Store the option's current state
1767 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1769 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1771 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1773 if (option_flag_var (option
, &global_options
) == &target_flags
)
1774 if (targetm
.check_pch_target_flags
)
1776 return get_option_state (&global_options
, option
, state
);
1779 /* Default version of get_pch_validity.
1780 By default, every flag difference is fatal; that will be mostly right for
1781 most targets, but completely right for very few. */
1784 default_get_pch_validity (size_t *sz
)
1786 struct cl_option_state state
;
1791 if (targetm
.check_pch_target_flags
)
1792 *sz
+= sizeof (target_flags
);
1793 for (i
= 0; i
< cl_options_count
; i
++)
1794 if (option_affects_pch_p (i
, &state
))
1797 result
= r
= XNEWVEC (char, *sz
);
1801 if (targetm
.check_pch_target_flags
)
1803 memcpy (r
, &target_flags
, sizeof (target_flags
));
1804 r
+= sizeof (target_flags
);
1807 for (i
= 0; i
< cl_options_count
; i
++)
1808 if (option_affects_pch_p (i
, &state
))
1810 memcpy (r
, state
.data
, state
.size
);
1817 /* Return a message which says that a PCH file was created with a different
1818 setting of OPTION. */
1821 pch_option_mismatch (const char *option
)
1823 return xasprintf (_("created and used with differing settings of '%s'"),
1827 /* Default version of pch_valid_p. */
1830 default_pch_valid_p (const void *data_p
, size_t len
)
1832 struct cl_option_state state
;
1833 const char *data
= (const char *)data_p
;
1836 /* -fpic and -fpie also usually make a PCH invalid. */
1837 if (data
[0] != flag_pic
)
1838 return _("created and used with different settings of -fpic");
1839 if (data
[1] != flag_pie
)
1840 return _("created and used with different settings of -fpie");
1843 /* Check target_flags. */
1844 if (targetm
.check_pch_target_flags
)
1849 memcpy (&tf
, data
, sizeof (target_flags
));
1850 data
+= sizeof (target_flags
);
1851 len
-= sizeof (target_flags
);
1852 r
= targetm
.check_pch_target_flags (tf
);
1857 for (i
= 0; i
< cl_options_count
; i
++)
1858 if (option_affects_pch_p (i
, &state
))
1860 if (memcmp (data
, state
.data
, state
.size
) != 0)
1861 return pch_option_mismatch (cl_options
[i
].opt_text
);
1869 /* Default version of cstore_mode. */
1872 default_cstore_mode (enum insn_code icode
)
1874 return insn_data
[(int) icode
].operand
[0].mode
;
1877 /* Default version of member_type_forces_blk. */
1880 default_member_type_forces_blk (const_tree
, machine_mode
)
1886 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
1887 rtx ptr ATTRIBUTE_UNUSED
,
1888 rtx bnd ATTRIBUTE_UNUSED
)
1894 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
1895 rtx addr ATTRIBUTE_UNUSED
,
1896 rtx bounds ATTRIBUTE_UNUSED
,
1897 rtx to ATTRIBUTE_UNUSED
)
1903 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
1909 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
1910 rtx bounds ATTRIBUTE_UNUSED
)
1915 /* Default version of canonicalize_comparison. */
1918 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1922 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
1925 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
1929 #ifndef PAD_VARARGS_DOWN
1930 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
1933 /* Build an indirect-ref expression over the given TREE, which represents a
1934 piece of a va_arg() expansion. */
1936 build_va_arg_indirect_ref (tree addr
)
1938 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
1942 /* The "standard" implementation of va_arg: read the value from the
1943 current (padded) address and increment by the (padded) size. */
1946 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
1949 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
1950 unsigned HOST_WIDE_INT align
, boundary
;
1953 /* All of the alignment and movement below is for args-grow-up machines.
1954 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
1955 implement their own specialized gimplify_va_arg_expr routines. */
1956 if (ARGS_GROW_DOWNWARD
)
1959 indirect
= pass_by_reference (NULL
, TYPE_MODE (type
), type
, false);
1961 type
= build_pointer_type (type
);
1963 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
1964 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
1966 /* When we align parameter on stack for caller, if the parameter
1967 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
1968 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
1969 here with caller. */
1970 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
1971 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
1973 boundary
/= BITS_PER_UNIT
;
1975 /* Hoist the valist value into a temporary for the moment. */
1976 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
1978 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
1979 requires greater alignment, we must perform dynamic alignment. */
1980 if (boundary
> align
1981 && !integer_zerop (TYPE_SIZE (type
)))
1983 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1984 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
1985 gimplify_and_add (t
, pre_p
);
1987 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1988 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
1990 build_int_cst (TREE_TYPE (valist
), -boundary
)));
1991 gimplify_and_add (t
, pre_p
);
1996 /* If the actual alignment is less than the alignment of the type,
1997 adjust the type accordingly so that we don't assume strict alignment
1998 when dereferencing the pointer. */
1999 boundary
*= BITS_PER_UNIT
;
2000 if (boundary
< TYPE_ALIGN (type
))
2002 type
= build_variant_type_copy (type
);
2003 SET_TYPE_ALIGN (type
, boundary
);
2006 /* Compute the rounded size of the type. */
2007 type_size
= size_in_bytes (type
);
2008 rounded_size
= round_up (type_size
, align
);
2010 /* Reduce rounded_size so it's sharable with the postqueue. */
2011 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2015 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2017 /* Small args are padded downward. */
2018 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2019 rounded_size
, size_int (align
));
2020 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2021 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2022 addr
= fold_build_pointer_plus (addr
, t
);
2025 /* Compute new value for AP. */
2026 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2027 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2028 gimplify_and_add (t
, pre_p
);
2030 addr
= fold_convert (build_pointer_type (type
), addr
);
2033 addr
= build_va_arg_indirect_ref (addr
);
2035 return build_va_arg_indirect_ref (addr
);
2039 default_chkp_bound_type (void)
2041 tree res
= make_node (POINTER_BOUNDS_TYPE
);
2042 TYPE_PRECISION (res
) = TYPE_PRECISION (size_type_node
) * 2;
2043 TYPE_NAME (res
) = get_identifier ("__bounds_type");
2044 SET_TYPE_MODE (res
, targetm
.chkp_bound_mode ());
2050 default_chkp_bound_mode (void)
2056 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED
)
2062 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED
,
2063 const_tree fn_decl_or_type ATTRIBUTE_UNUSED
,
2064 bool outgoing ATTRIBUTE_UNUSED
)
2070 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED
,
2071 HOST_WIDE_INT ub ATTRIBUTE_UNUSED
)
2077 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED
,
2078 tree lb ATTRIBUTE_UNUSED
,
2079 tree ub ATTRIBUTE_UNUSED
,
2080 tree
*stmts ATTRIBUTE_UNUSED
)
2086 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED
,
2087 machine_mode mode ATTRIBUTE_UNUSED
,
2088 tree type ATTRIBUTE_UNUSED
,
2089 int *pretend_arg_size ATTRIBUTE_UNUSED
,
2090 int second_time ATTRIBUTE_UNUSED
)
2094 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2095 not support nested low-overhead loops. */
2098 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2099 unsigned int loop_depth
, bool)
2101 return loop_depth
== 1;
2104 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2107 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2112 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2115 default_max_noce_ifcvt_seq_cost (edge e
)
2117 bool predictable_p
= predictable_edge_p (e
);
2119 enum compiler_param param
2121 ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2122 : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST
);
2124 /* If we have a parameter set, use that, otherwise take a guess using
2126 if (global_options_set
.x_param_values
[param
])
2127 return PARAM_VALUE (param
);
2129 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2132 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2135 default_min_arithmetic_precision (void)
2137 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2140 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2142 enum flt_eval_method
2143 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2145 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2148 #include "gt-targhooks.h"