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
472 opt_scalar_float_mode
473 default_floatn_mode (int n
, bool extended
)
477 opt_scalar_float_mode cand1
, cand2
;
478 scalar_float_mode mode
;
500 /* Those are the only valid _FloatNx types. */
503 if (cand1
.exists (&mode
)
504 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
505 && targetm
.scalar_mode_supported_p (mode
)
506 && targetm
.libgcc_floating_mode_supported_p (mode
))
508 if (cand2
.exists (&mode
)
509 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
510 && targetm
.scalar_mode_supported_p (mode
)
511 && targetm
.libgcc_floating_mode_supported_p (mode
))
516 opt_scalar_float_mode cand
;
517 scalar_float_mode mode
;
521 /* Always enable _Float16 if we have basic support for the mode.
522 Targets can control the range and precision of operations on
523 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
550 if (cand
.exists (&mode
)
551 && REAL_MODE_FORMAT (mode
)->ieee_bits
== n
552 && targetm
.scalar_mode_supported_p (mode
)
553 && targetm
.libgcc_floating_mode_supported_p (mode
))
556 return opt_scalar_float_mode ();
559 /* Make some target macros useable by target-independent code. */
561 targhook_words_big_endian (void)
563 return !!WORDS_BIG_ENDIAN
;
567 targhook_float_words_big_endian (void)
569 return !!FLOAT_WORDS_BIG_ENDIAN
;
572 /* True if the target supports floating-point exceptions and rounding
576 default_float_exceptions_rounding_supported_p (void)
585 /* True if the target supports decimal floating point. */
588 default_decimal_float_supported_p (void)
590 return ENABLE_DECIMAL_FLOAT
;
593 /* True if the target supports fixed-point arithmetic. */
596 default_fixed_point_supported_p (void)
598 return ENABLE_FIXED_POINT
;
601 /* True if the target supports GNU indirect functions. */
604 default_has_ifunc_p (void)
606 return HAVE_GNU_INDIRECT_FUNCTION
;
609 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
612 This function checks whether a given INSN is valid within a low-overhead
613 loop. If INSN is invalid it returns the reason for that, otherwise it
614 returns NULL. A called function may clobber any special registers required
615 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
616 register for branch on table instructions. We reject the doloop pattern in
620 default_invalid_within_doloop (const rtx_insn
*insn
)
623 return "Function call in loop.";
625 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
626 return "Computed branch in the loop.";
631 /* Mapping of builtin functions to vectorized variants. */
634 default_builtin_vectorized_function (unsigned int, tree
, tree
)
639 /* Mapping of target builtin functions to vectorized variants. */
642 default_builtin_md_vectorized_function (tree
, tree
, tree
)
647 /* Vectorized conversion. */
650 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
651 tree dest_type ATTRIBUTE_UNUSED
,
652 tree src_type ATTRIBUTE_UNUSED
)
657 /* Default vectorizer cost model values. */
660 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
662 int misalign ATTRIBUTE_UNUSED
)
664 switch (type_of_cost
)
674 case cond_branch_not_taken
:
676 case vec_promote_demote
:
680 case unaligned_store
:
683 case cond_branch_taken
:
687 return TYPE_VECTOR_SUBPARTS (vectype
) - 1;
697 default_builtin_reciprocal (tree
)
703 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
704 cumulative_args_t ca ATTRIBUTE_UNUSED
,
705 machine_mode mode ATTRIBUTE_UNUSED
,
706 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
712 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
713 cumulative_args_t ca ATTRIBUTE_UNUSED
,
714 machine_mode mode ATTRIBUTE_UNUSED
,
715 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
721 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
722 cumulative_args_t ca ATTRIBUTE_UNUSED
,
723 machine_mode mode ATTRIBUTE_UNUSED
,
724 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
730 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
731 machine_mode mode ATTRIBUTE_UNUSED
,
732 const_tree type ATTRIBUTE_UNUSED
,
733 bool named ATTRIBUTE_UNUSED
)
739 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
740 machine_mode mode ATTRIBUTE_UNUSED
,
741 const_tree type ATTRIBUTE_UNUSED
,
742 bool named ATTRIBUTE_UNUSED
)
748 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
749 machine_mode mode ATTRIBUTE_UNUSED
,
750 const_tree type ATTRIBUTE_UNUSED
,
751 bool named ATTRIBUTE_UNUSED
)
757 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
758 const_tree type ATTRIBUTE_UNUSED
)
760 return PARM_BOUNDARY
;
764 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
765 const_tree type ATTRIBUTE_UNUSED
)
767 return PARM_BOUNDARY
;
771 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
776 hook_invalid_arg_for_unprototyped_fn (
777 const_tree typelist ATTRIBUTE_UNUSED
,
778 const_tree funcdecl ATTRIBUTE_UNUSED
,
779 const_tree val ATTRIBUTE_UNUSED
)
784 /* Initialize the stack protection decls. */
786 /* Stack protection related decls living in libgcc. */
787 static GTY(()) tree stack_chk_guard_decl
;
790 default_stack_protect_guard (void)
792 tree t
= stack_chk_guard_decl
;
798 t
= build_decl (UNKNOWN_LOCATION
,
799 VAR_DECL
, get_identifier ("__stack_chk_guard"),
803 DECL_EXTERNAL (t
) = 1;
805 TREE_THIS_VOLATILE (t
) = 1;
806 DECL_ARTIFICIAL (t
) = 1;
807 DECL_IGNORED_P (t
) = 1;
809 /* Do not share RTL as the declaration is visible outside of
812 RTX_FLAG (x
, used
) = 1;
814 stack_chk_guard_decl
= t
;
820 static GTY(()) tree stack_chk_fail_decl
;
823 default_external_stack_protect_fail (void)
825 tree t
= stack_chk_fail_decl
;
829 t
= build_function_type_list (void_type_node
, NULL_TREE
);
830 t
= build_decl (UNKNOWN_LOCATION
,
831 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
834 DECL_EXTERNAL (t
) = 1;
836 TREE_THIS_VOLATILE (t
) = 1;
837 TREE_NOTHROW (t
) = 1;
838 DECL_ARTIFICIAL (t
) = 1;
839 DECL_IGNORED_P (t
) = 1;
840 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
841 DECL_VISIBILITY_SPECIFIED (t
) = 1;
843 stack_chk_fail_decl
= t
;
846 return build_call_expr (t
, 0);
850 default_hidden_stack_protect_fail (void)
852 #ifndef HAVE_GAS_HIDDEN
853 return default_external_stack_protect_fail ();
855 tree t
= stack_chk_fail_decl
;
858 return default_external_stack_protect_fail ();
862 t
= build_function_type_list (void_type_node
, NULL_TREE
);
863 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
864 get_identifier ("__stack_chk_fail_local"), t
);
867 DECL_EXTERNAL (t
) = 1;
869 TREE_THIS_VOLATILE (t
) = 1;
870 TREE_NOTHROW (t
) = 1;
871 DECL_ARTIFICIAL (t
) = 1;
872 DECL_IGNORED_P (t
) = 1;
873 DECL_VISIBILITY_SPECIFIED (t
) = 1;
874 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
876 stack_chk_fail_decl
= t
;
879 return build_call_expr (t
, 0);
884 hook_bool_const_rtx_commutative_p (const_rtx x
,
885 int outer_code ATTRIBUTE_UNUSED
)
887 return COMMUTATIVE_P (x
);
891 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
892 const_tree fn_decl_or_type
,
893 bool outgoing ATTRIBUTE_UNUSED
)
895 /* The old interface doesn't handle receiving the function type. */
897 && !DECL_P (fn_decl_or_type
))
898 fn_decl_or_type
= NULL
;
900 #ifdef FUNCTION_VALUE
901 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
908 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
909 const_rtx fun ATTRIBUTE_UNUSED
)
912 return LIBCALL_VALUE (mode
);
918 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
921 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
923 #ifdef FUNCTION_VALUE_REGNO_P
924 return FUNCTION_VALUE_REGNO_P (regno
);
931 default_internal_arg_pointer (void)
933 /* If the reg that the virtual arg pointer will be translated into is
934 not a fixed reg or is the stack pointer, make a copy of the virtual
935 arg pointer, and address parms via the copy. The frame pointer is
936 considered fixed even though it is not marked as such. */
937 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
938 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
939 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
940 return copy_to_reg (virtual_incoming_args_rtx
);
942 return virtual_incoming_args_rtx
;
946 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
950 #ifdef STATIC_CHAIN_INCOMING_REGNUM
951 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
955 #ifdef STATIC_CHAIN_REGNUM
956 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
960 static bool issued_error
;
964 sorry ("nested functions not supported on this target");
967 /* It really doesn't matter what we return here, so long at it
968 doesn't cause the rest of the compiler to crash. */
969 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
974 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
975 rtx
ARG_UNUSED (r_chain
))
977 sorry ("nested function trampolines not supported on this target");
981 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
982 tree funtype ATTRIBUTE_UNUSED
,
983 int size ATTRIBUTE_UNUSED
)
989 default_branch_target_register_class (void)
995 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
997 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1003 default_lra_p (void)
1009 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1015 default_register_usage_leveling_p (void)
1021 default_different_addr_displacement_p (void)
1027 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1028 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1029 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1030 secondary_reload_info
*sri
)
1032 enum reg_class rclass
= NO_REGS
;
1033 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1035 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1037 sri
->icode
= sri
->prev_sri
->t_icode
;
1040 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1042 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
1044 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1046 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
1048 if (rclass
!= NO_REGS
)
1050 enum insn_code icode
1051 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1054 if (icode
!= CODE_FOR_nothing
1055 && !insn_operand_matches (icode
, in_p
, x
))
1056 icode
= CODE_FOR_nothing
;
1057 else if (icode
!= CODE_FOR_nothing
)
1059 const char *insn_constraint
, *scratch_constraint
;
1060 enum reg_class insn_class
, scratch_class
;
1062 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1063 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1064 if (!*insn_constraint
)
1065 insn_class
= ALL_REGS
;
1070 gcc_assert (*insn_constraint
== '=');
1073 insn_class
= (reg_class_for_constraint
1074 (lookup_constraint (insn_constraint
)));
1075 gcc_assert (insn_class
!= NO_REGS
);
1078 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1079 /* The scratch register's constraint must start with "=&",
1080 except for an input reload, where only "=" is necessary,
1081 and where it might be beneficial to re-use registers from
1083 gcc_assert (scratch_constraint
[0] == '='
1084 && (in_p
|| scratch_constraint
[1] == '&'));
1085 scratch_constraint
++;
1086 if (*scratch_constraint
== '&')
1087 scratch_constraint
++;
1088 scratch_class
= (reg_class_for_constraint
1089 (lookup_constraint (scratch_constraint
)));
1091 if (reg_class_subset_p (reload_class
, insn_class
))
1093 gcc_assert (scratch_class
== rclass
);
1097 rclass
= insn_class
;
1100 if (rclass
== NO_REGS
)
1103 sri
->t_icode
= icode
;
1108 /* By default, if flag_pic is true, then neither local nor global relocs
1109 should be placed in readonly memory. */
1112 default_reloc_rw_mask (void)
1114 return flag_pic
? 3 : 0;
1117 /* By default, do no modification. */
1118 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1124 /* Default to natural alignment for vector types. */
1126 default_vector_alignment (const_tree type
)
1128 HOST_WIDE_INT align
= tree_to_shwi (TYPE_SIZE (type
));
1129 if (align
> MAX_OFILE_ALIGNMENT
)
1130 align
= MAX_OFILE_ALIGNMENT
;
1134 /* By default assume vectors of element TYPE require a multiple of the natural
1135 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1137 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1142 /* By default, assume that a target supports any factor of misalignment
1143 memory access if it supports movmisalign patten.
1144 is_packed is true if the memory access is defined in a packed struct. */
1146 default_builtin_support_vector_misalignment (machine_mode mode
,
1154 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1159 /* By default, only attempt to parallelize bitwise operations, and
1160 possibly adds/subtracts using bit-twiddling. */
1163 default_preferred_simd_mode (machine_mode mode ATTRIBUTE_UNUSED
)
1168 /* By default only the size derived from the preferred vector mode
1172 default_autovectorize_vector_sizes (void)
1177 /* By defaults a vector of integers is used as a mask. */
1180 default_get_mask_mode (unsigned nunits
, unsigned vector_size
)
1182 unsigned elem_size
= vector_size
/ nunits
;
1183 machine_mode elem_mode
1184 = smallest_mode_for_size (elem_size
* BITS_PER_UNIT
, MODE_INT
);
1185 machine_mode vector_mode
;
1187 gcc_assert (elem_size
* nunits
== vector_size
);
1189 vector_mode
= mode_for_vector (elem_mode
, nunits
);
1190 if (!VECTOR_MODE_P (vector_mode
)
1191 || !targetm
.vector_mode_supported_p (vector_mode
))
1192 vector_mode
= BLKmode
;
1197 /* By default, the cost model accumulates three separate costs (prologue,
1198 loop body, and epilogue) for a vectorized loop or block. So allocate an
1199 array of three unsigned ints, set it to zero, and return its address. */
1202 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1204 unsigned *cost
= XNEWVEC (unsigned, 3);
1205 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1209 /* By default, the cost model looks up the cost of the given statement
1210 kind and mode, multiplies it by the occurrence count, accumulates
1211 it into the cost specified by WHERE, and returns the cost added. */
1214 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1215 struct _stmt_vec_info
*stmt_info
, int misalign
,
1216 enum vect_cost_model_location where
)
1218 unsigned *cost
= (unsigned *) data
;
1219 unsigned retval
= 0;
1221 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1222 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1224 /* Statements in an inner loop relative to the loop being
1225 vectorized are weighted more heavily. The value here is
1226 arbitrary and could potentially be improved with analysis. */
1227 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1228 count
*= 50; /* FIXME. */
1230 retval
= (unsigned) (count
* stmt_cost
);
1231 cost
[where
] += retval
;
1236 /* By default, the cost model just returns the accumulated costs. */
1239 default_finish_cost (void *data
, unsigned *prologue_cost
,
1240 unsigned *body_cost
, unsigned *epilogue_cost
)
1242 unsigned *cost
= (unsigned *) data
;
1243 *prologue_cost
= cost
[vect_prologue
];
1244 *body_cost
= cost
[vect_body
];
1245 *epilogue_cost
= cost
[vect_epilogue
];
1248 /* Free the cost data. */
1251 default_destroy_cost_data (void *data
)
1256 /* Determine whether or not a pointer mode is valid. Assume defaults
1257 of ptr_mode or Pmode - can be overridden. */
1259 default_valid_pointer_mode (machine_mode mode
)
1261 return (mode
== ptr_mode
|| mode
== Pmode
);
1264 /* Determine whether the memory reference specified by REF may alias
1265 the C libraries errno location. */
1267 default_ref_may_alias_errno (ao_ref
*ref
)
1269 tree base
= ao_ref_base (ref
);
1270 /* The default implementation assumes the errno location is
1271 a declaration of type int or is always accessed via a
1272 pointer to int. We assume that accesses to errno are
1273 not deliberately obfuscated (even in conforming ways). */
1274 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1275 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1277 /* The default implementation assumes an errno location
1278 declaration is never defined in the current compilation unit. */
1280 && !TREE_STATIC (base
))
1282 else if (TREE_CODE (base
) == MEM_REF
1283 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1285 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1286 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1291 /* Return the mode for a pointer to a given ADDRSPACE,
1292 defaulting to ptr_mode for all address spaces. */
1295 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1300 /* Return the mode for an address in a given ADDRSPACE,
1301 defaulting to Pmode for all address spaces. */
1304 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1309 /* Named address space version of valid_pointer_mode.
1310 To match the above, the same modes apply to all address spaces. */
1313 default_addr_space_valid_pointer_mode (machine_mode mode
,
1314 addr_space_t as ATTRIBUTE_UNUSED
)
1316 return targetm
.valid_pointer_mode (mode
);
1319 /* Some places still assume that all pointer or address modes are the
1320 standard Pmode and ptr_mode. These optimizations become invalid if
1321 the target actually supports multiple different modes. For now,
1322 we disable such optimizations on such targets, using this function. */
1325 target_default_pointer_address_modes_p (void)
1327 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1329 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1335 /* Named address space version of legitimate_address_p.
1336 By default, all address spaces have the same form. */
1339 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1341 addr_space_t as ATTRIBUTE_UNUSED
)
1343 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1346 /* Named address space version of LEGITIMIZE_ADDRESS.
1347 By default, all address spaces have the same form. */
1350 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1351 addr_space_t as ATTRIBUTE_UNUSED
)
1353 return targetm
.legitimize_address (x
, oldx
, mode
);
1356 /* The default hook for determining if one named address space is a subset of
1357 another and to return which address space to use as the common address
1361 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1363 return (subset
== superset
);
1366 /* The default hook for determining if 0 within a named address
1367 space is a valid address. */
1370 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1375 /* The default hook for debugging the address space is to return the
1376 address space number to indicate DW_AT_address_class. */
1378 default_addr_space_debug (addr_space_t as
)
1383 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1384 Don't complain about any address space. */
1387 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1392 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1393 called for targets with only a generic address space. */
1396 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1397 tree from_type ATTRIBUTE_UNUSED
,
1398 tree to_type ATTRIBUTE_UNUSED
)
1404 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1409 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1412 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1413 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1419 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1420 tree
ARG_UNUSED (name
),
1421 tree
ARG_UNUSED (args
),
1422 int ARG_UNUSED (flags
))
1424 warning (OPT_Wattributes
,
1425 "target attribute is not supported on this machine");
1431 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1432 tree
ARG_UNUSED (pop_target
))
1434 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1435 emit no warning because "#pragma GCC pop_target" is valid on targets that
1436 do not have the "target" pragma. */
1438 warning (OPT_Wpragmas
,
1439 "#pragma GCC target is not supported for this machine");
1445 default_target_can_inline_p (tree caller
, tree callee
)
1447 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1448 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1450 callee_opts
= target_option_default_node
;
1452 caller_opts
= target_option_default_node
;
1454 /* If both caller and callee have attributes, assume that if the
1455 pointer is different, the two functions have different target
1456 options since build_target_option_node uses a hash table for the
1458 return callee_opts
== caller_opts
;
1461 /* If the machine does not have a case insn that compares the bounds,
1462 this means extra overhead for dispatch tables, which raises the
1463 threshold for using them. */
1466 default_case_values_threshold (void)
1468 return (targetm
.have_casesi () ? 4 : 5);
1472 default_have_conditional_execution (void)
1474 return HAVE_conditional_execution
;
1477 /* By default we assume that c99 functions are present at the runtime,
1478 but sincos is not. */
1480 default_libc_has_function (enum function_class fn_class
)
1482 if (fn_class
== function_c94
1483 || fn_class
== function_c99_misc
1484 || fn_class
== function_c99_math_complex
)
1491 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1497 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1503 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1508 /* Compute cost of moving registers to/from memory. */
1511 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1512 reg_class_t rclass ATTRIBUTE_UNUSED
,
1513 bool in ATTRIBUTE_UNUSED
)
1515 #ifndef MEMORY_MOVE_COST
1516 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1518 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1522 /* Compute cost of moving data from a register of class FROM to one of
1526 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1527 reg_class_t from ATTRIBUTE_UNUSED
,
1528 reg_class_t to ATTRIBUTE_UNUSED
)
1530 #ifndef REGISTER_MOVE_COST
1533 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1537 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1538 behavior. SPEED_P is true if we are compiling for speed. */
1541 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1543 unsigned int move_ratio
;
1545 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1547 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1549 #else /* No movmem patterns, pick a default. */
1550 move_ratio
= ((speed_p
) ? 15 : 3);
1556 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1557 used; return FALSE if the movmem/setmem optab should be expanded, or
1558 a call to memcpy emitted. */
1561 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1562 unsigned int alignment
,
1563 enum by_pieces_operation op
,
1566 unsigned int max_size
= 0;
1567 unsigned int ratio
= 0;
1571 case CLEAR_BY_PIECES
:
1572 max_size
= STORE_MAX_PIECES
;
1573 ratio
= CLEAR_RATIO (speed_p
);
1575 case MOVE_BY_PIECES
:
1576 max_size
= MOVE_MAX_PIECES
;
1577 ratio
= get_move_ratio (speed_p
);
1580 max_size
= STORE_MAX_PIECES
;
1581 ratio
= SET_RATIO (speed_p
);
1583 case STORE_BY_PIECES
:
1584 max_size
= STORE_MAX_PIECES
;
1585 ratio
= get_move_ratio (speed_p
);
1587 case COMPARE_BY_PIECES
:
1588 max_size
= COMPARE_MAX_PIECES
;
1589 /* Pick a likely default, just as in get_move_ratio. */
1590 ratio
= speed_p
? 15 : 3;
1594 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1597 /* This hook controls code generation for expanding a memcmp operation by
1598 pieces. Return 1 for the normal pattern of compare/jump after each pair
1599 of loads, or a higher number to reduce the number of branches. */
1602 default_compare_by_pieces_branch_ratio (machine_mode
)
1607 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1608 entry. If RECORD_P is true and the target supports named sections,
1609 the location of the NOPs will be recorded in a special object section
1610 called "__patchable_function_entries". This routine may be called
1611 twice per function to put NOPs before and after the function
1615 default_print_patchable_function_entry (FILE *file
,
1616 unsigned HOST_WIDE_INT patch_area_size
,
1619 const char *nop_templ
= 0;
1621 rtx_insn
*my_nop
= make_insn_raw (gen_nop ());
1623 /* We use the template alone, relying on the (currently sane) assumption
1624 that the NOP template does not have variable operands. */
1625 code_num
= recog_memoized (my_nop
);
1626 nop_templ
= get_insn_template (code_num
, my_nop
);
1628 if (record_p
&& targetm_common
.have_named_sections
)
1631 static int patch_area_number
;
1632 section
*previous_section
= in_section
;
1634 patch_area_number
++;
1635 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE", patch_area_number
);
1637 switch_to_section (get_section ("__patchable_function_entries",
1639 fputs (integer_asm_op (POINTER_SIZE_UNITS
, false), file
);
1640 assemble_name_raw (file
, buf
);
1643 switch_to_section (previous_section
);
1644 ASM_OUTPUT_LABEL (file
, buf
);
1648 for (i
= 0; i
< patch_area_size
; ++i
)
1649 fprintf (file
, "\t%s\n", nop_templ
);
1653 default_profile_before_prologue (void)
1655 #ifdef PROFILE_BEFORE_PROLOGUE
1662 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1665 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1668 #ifdef PREFERRED_RELOAD_CLASS
1669 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1675 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1678 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1684 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1686 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1691 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1694 default_class_likely_spilled_p (reg_class_t rclass
)
1696 return (reg_class_size
[(int) rclass
] == 1);
1699 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1702 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1703 machine_mode mode ATTRIBUTE_UNUSED
)
1705 #ifdef CLASS_MAX_NREGS
1706 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1708 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1712 /* Determine the debugging unwind mechanism for the target. */
1714 enum unwind_info_type
1715 default_debug_unwind_info (void)
1717 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1718 /* ??? Change all users to the hook, then poison this. */
1719 #ifdef DWARF2_FRAME_INFO
1720 if (DWARF2_FRAME_INFO
)
1724 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1725 #ifdef DWARF2_DEBUGGING_INFO
1726 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1733 /* Determine the correct mode for a Dwarf frame register that represents
1737 default_dwarf_frame_reg_mode (int regno
)
1739 machine_mode save_mode
= reg_raw_mode
[regno
];
1741 if (HARD_REGNO_CALL_PART_CLOBBERED (regno
, save_mode
))
1742 save_mode
= choose_hard_reg_mode (regno
, 1, true);
1746 /* To be used by targets where reg_raw_mode doesn't return the right
1747 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1750 default_get_reg_raw_mode (int regno
)
1752 return reg_raw_mode
[regno
];
1755 /* Return true if a leaf function should stay leaf even with profiling
1759 default_keep_leaf_when_profiled ()
1764 /* Return true if the state of option OPTION should be stored in PCH files
1765 and checked by default_pch_valid_p. Store the option's current state
1769 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1771 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1773 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1775 if (option_flag_var (option
, &global_options
) == &target_flags
)
1776 if (targetm
.check_pch_target_flags
)
1778 return get_option_state (&global_options
, option
, state
);
1781 /* Default version of get_pch_validity.
1782 By default, every flag difference is fatal; that will be mostly right for
1783 most targets, but completely right for very few. */
1786 default_get_pch_validity (size_t *sz
)
1788 struct cl_option_state state
;
1793 if (targetm
.check_pch_target_flags
)
1794 *sz
+= sizeof (target_flags
);
1795 for (i
= 0; i
< cl_options_count
; i
++)
1796 if (option_affects_pch_p (i
, &state
))
1799 result
= r
= XNEWVEC (char, *sz
);
1803 if (targetm
.check_pch_target_flags
)
1805 memcpy (r
, &target_flags
, sizeof (target_flags
));
1806 r
+= sizeof (target_flags
);
1809 for (i
= 0; i
< cl_options_count
; i
++)
1810 if (option_affects_pch_p (i
, &state
))
1812 memcpy (r
, state
.data
, state
.size
);
1819 /* Return a message which says that a PCH file was created with a different
1820 setting of OPTION. */
1823 pch_option_mismatch (const char *option
)
1825 return xasprintf (_("created and used with differing settings of '%s'"),
1829 /* Default version of pch_valid_p. */
1832 default_pch_valid_p (const void *data_p
, size_t len
)
1834 struct cl_option_state state
;
1835 const char *data
= (const char *)data_p
;
1838 /* -fpic and -fpie also usually make a PCH invalid. */
1839 if (data
[0] != flag_pic
)
1840 return _("created and used with different settings of -fpic");
1841 if (data
[1] != flag_pie
)
1842 return _("created and used with different settings of -fpie");
1845 /* Check target_flags. */
1846 if (targetm
.check_pch_target_flags
)
1851 memcpy (&tf
, data
, sizeof (target_flags
));
1852 data
+= sizeof (target_flags
);
1853 len
-= sizeof (target_flags
);
1854 r
= targetm
.check_pch_target_flags (tf
);
1859 for (i
= 0; i
< cl_options_count
; i
++)
1860 if (option_affects_pch_p (i
, &state
))
1862 if (memcmp (data
, state
.data
, state
.size
) != 0)
1863 return pch_option_mismatch (cl_options
[i
].opt_text
);
1871 /* Default version of cstore_mode. */
1874 default_cstore_mode (enum insn_code icode
)
1876 return insn_data
[(int) icode
].operand
[0].mode
;
1879 /* Default version of member_type_forces_blk. */
1882 default_member_type_forces_blk (const_tree
, machine_mode
)
1888 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
1889 rtx ptr ATTRIBUTE_UNUSED
,
1890 rtx bnd ATTRIBUTE_UNUSED
)
1896 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
1897 rtx addr ATTRIBUTE_UNUSED
,
1898 rtx bounds ATTRIBUTE_UNUSED
,
1899 rtx to ATTRIBUTE_UNUSED
)
1905 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
1911 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
1912 rtx bounds ATTRIBUTE_UNUSED
)
1917 /* Default version of canonicalize_comparison. */
1920 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1924 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
1927 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
1931 #ifndef PAD_VARARGS_DOWN
1932 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
1935 /* Build an indirect-ref expression over the given TREE, which represents a
1936 piece of a va_arg() expansion. */
1938 build_va_arg_indirect_ref (tree addr
)
1940 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
1944 /* The "standard" implementation of va_arg: read the value from the
1945 current (padded) address and increment by the (padded) size. */
1948 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
1951 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
1952 unsigned HOST_WIDE_INT align
, boundary
;
1955 /* All of the alignment and movement below is for args-grow-up machines.
1956 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
1957 implement their own specialized gimplify_va_arg_expr routines. */
1958 if (ARGS_GROW_DOWNWARD
)
1961 indirect
= pass_by_reference (NULL
, TYPE_MODE (type
), type
, false);
1963 type
= build_pointer_type (type
);
1965 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
1966 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
1968 /* When we align parameter on stack for caller, if the parameter
1969 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
1970 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
1971 here with caller. */
1972 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
1973 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
1975 boundary
/= BITS_PER_UNIT
;
1977 /* Hoist the valist value into a temporary for the moment. */
1978 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
1980 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
1981 requires greater alignment, we must perform dynamic alignment. */
1982 if (boundary
> align
1983 && !integer_zerop (TYPE_SIZE (type
)))
1985 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1986 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
1987 gimplify_and_add (t
, pre_p
);
1989 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1990 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
1992 build_int_cst (TREE_TYPE (valist
), -boundary
)));
1993 gimplify_and_add (t
, pre_p
);
1998 /* If the actual alignment is less than the alignment of the type,
1999 adjust the type accordingly so that we don't assume strict alignment
2000 when dereferencing the pointer. */
2001 boundary
*= BITS_PER_UNIT
;
2002 if (boundary
< TYPE_ALIGN (type
))
2004 type
= build_variant_type_copy (type
);
2005 SET_TYPE_ALIGN (type
, boundary
);
2008 /* Compute the rounded size of the type. */
2009 type_size
= size_in_bytes (type
);
2010 rounded_size
= round_up (type_size
, align
);
2012 /* Reduce rounded_size so it's sharable with the postqueue. */
2013 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2017 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2019 /* Small args are padded downward. */
2020 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2021 rounded_size
, size_int (align
));
2022 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2023 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2024 addr
= fold_build_pointer_plus (addr
, t
);
2027 /* Compute new value for AP. */
2028 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2029 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2030 gimplify_and_add (t
, pre_p
);
2032 addr
= fold_convert (build_pointer_type (type
), addr
);
2035 addr
= build_va_arg_indirect_ref (addr
);
2037 return build_va_arg_indirect_ref (addr
);
2041 default_chkp_bound_type (void)
2043 tree res
= make_node (POINTER_BOUNDS_TYPE
);
2044 TYPE_PRECISION (res
) = TYPE_PRECISION (size_type_node
) * 2;
2045 TYPE_NAME (res
) = get_identifier ("__bounds_type");
2046 SET_TYPE_MODE (res
, targetm
.chkp_bound_mode ());
2052 default_chkp_bound_mode (void)
2058 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED
)
2064 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED
,
2065 const_tree fn_decl_or_type ATTRIBUTE_UNUSED
,
2066 bool outgoing ATTRIBUTE_UNUSED
)
2072 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED
,
2073 HOST_WIDE_INT ub ATTRIBUTE_UNUSED
)
2079 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED
,
2080 tree lb ATTRIBUTE_UNUSED
,
2081 tree ub ATTRIBUTE_UNUSED
,
2082 tree
*stmts ATTRIBUTE_UNUSED
)
2088 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED
,
2089 machine_mode mode ATTRIBUTE_UNUSED
,
2090 tree type ATTRIBUTE_UNUSED
,
2091 int *pretend_arg_size ATTRIBUTE_UNUSED
,
2092 int second_time ATTRIBUTE_UNUSED
)
2096 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2097 not support nested low-overhead loops. */
2100 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2101 unsigned int loop_depth
, bool)
2103 return loop_depth
== 1;
2106 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2109 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2114 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2117 default_max_noce_ifcvt_seq_cost (edge e
)
2119 bool predictable_p
= predictable_edge_p (e
);
2121 enum compiler_param param
2123 ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2124 : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST
);
2126 /* If we have a parameter set, use that, otherwise take a guess using
2128 if (global_options_set
.x_param_values
[param
])
2129 return PARAM_VALUE (param
);
2131 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2134 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2137 default_min_arithmetic_precision (void)
2139 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2142 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2144 enum flt_eval_method
2145 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2147 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2150 #include "gt-targhooks.h"