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"
86 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
87 rtx addr ATTRIBUTE_UNUSED
,
88 bool strict ATTRIBUTE_UNUSED
)
90 #ifdef GO_IF_LEGITIMATE_ADDRESS
91 /* Defer to the old implementation using a goto. */
93 return strict_memory_address_p (mode
, addr
);
95 return memory_address_p (mode
, addr
);
102 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
104 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
105 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
110 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
114 /* Any floating arithmetic may trap. */
115 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
118 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
120 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
128 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
130 int *punsignedp ATTRIBUTE_UNUSED
,
131 const_tree funtype ATTRIBUTE_UNUSED
,
132 int for_return ATTRIBUTE_UNUSED
)
134 if (type
!= NULL_TREE
&& for_return
== 2)
135 return promote_mode (type
, mode
, punsignedp
);
140 default_promote_function_mode_always_promote (const_tree type
,
143 const_tree funtype ATTRIBUTE_UNUSED
,
144 int for_return ATTRIBUTE_UNUSED
)
146 return promote_mode (type
, mode
, punsignedp
);
150 default_cc_modes_compatible (machine_mode m1
, machine_mode m2
)
158 default_return_in_memory (const_tree type
,
159 const_tree fntype ATTRIBUTE_UNUSED
)
161 return (TYPE_MODE (type
) == BLKmode
);
165 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
166 machine_mode mode ATTRIBUTE_UNUSED
)
172 default_legitimize_address_displacement (rtx
*disp ATTRIBUTE_UNUSED
,
173 rtx
*offset ATTRIBUTE_UNUSED
,
174 machine_mode mode ATTRIBUTE_UNUSED
)
180 default_expand_builtin_saveregs (void)
182 error ("__builtin_saveregs not supported by this target");
187 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED
,
188 machine_mode mode ATTRIBUTE_UNUSED
,
189 tree type ATTRIBUTE_UNUSED
,
190 int *pretend_arg_size ATTRIBUTE_UNUSED
,
191 int second_time ATTRIBUTE_UNUSED
)
195 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
198 default_builtin_setjmp_frame_value (void)
200 return virtual_stack_vars_rtx
;
203 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
206 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
212 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
214 return (targetm
.calls
.setup_incoming_varargs
215 != default_setup_incoming_varargs
);
219 default_eh_return_filter_mode (void)
221 return targetm
.unwind_word_mode ();
225 default_libgcc_cmp_return_mode (void)
231 default_libgcc_shift_count_mode (void)
237 default_unwind_word_mode (void)
242 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
244 unsigned HOST_WIDE_INT
245 default_shift_truncation_mask (machine_mode mode
)
247 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
250 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
253 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED
)
255 return have_insn_for (DIV
, mode
) ? 3 : 2;
258 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
261 default_mode_rep_extended (machine_mode mode ATTRIBUTE_UNUSED
,
262 machine_mode mode_rep ATTRIBUTE_UNUSED
)
267 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
270 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
275 /* Return machine mode for non-standard suffix
276 or VOIDmode if non-standard suffixes are unsupported. */
278 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
283 /* The generic C++ ABI specifies this is a 64-bit value. */
285 default_cxx_guard_type (void)
287 return long_long_integer_type_node
;
290 /* Returns the size of the cookie to use when allocating an array
291 whose elements have the indicated TYPE. Assumes that it is already
292 known that a cookie is needed. */
295 default_cxx_get_cookie_size (tree type
)
299 /* We need to allocate an additional max (sizeof (size_t), alignof
300 (true_type)) bytes. */
304 sizetype_size
= size_in_bytes (sizetype
);
305 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
306 if (tree_int_cst_lt (type_align
, sizetype_size
))
307 cookie_size
= sizetype_size
;
309 cookie_size
= type_align
;
314 /* Return true if a parameter must be passed by reference. This version
315 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
318 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED
,
319 machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
320 bool named_arg ATTRIBUTE_UNUSED
)
322 return targetm
.calls
.must_pass_in_stack (mode
, type
);
325 /* Return true if a parameter follows callee copies conventions. This
326 version of the hook is true for all named arguments. */
329 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED
,
330 machine_mode mode ATTRIBUTE_UNUSED
,
331 const_tree type ATTRIBUTE_UNUSED
, bool named
)
336 /* Emit to STREAM the assembler syntax for insn operand X. */
339 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
340 int code ATTRIBUTE_UNUSED
)
343 PRINT_OPERAND (stream
, x
, code
);
349 /* Emit to STREAM the assembler syntax for an insn operand whose memory
353 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
354 machine_mode
/*mode*/,
355 rtx x ATTRIBUTE_UNUSED
)
357 #ifdef PRINT_OPERAND_ADDRESS
358 PRINT_OPERAND_ADDRESS (stream
, x
);
364 /* Return true if CODE is a valid punctuation character for the
365 `print_operand' hook. */
368 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
370 #ifdef PRINT_OPERAND_PUNCT_VALID_P
371 return PRINT_OPERAND_PUNCT_VALID_P (code
);
377 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
379 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
381 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
382 const char *stripped
= targetm
.strip_name_encoding (skipped
);
383 if (*name
!= '*' && user_label_prefix
[0])
384 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
385 return get_identifier (stripped
);
388 /* True if MODE is valid for the target. By "valid", we mean able to
389 be manipulated in non-trivial ways. In particular, this means all
390 the arithmetic is supported.
392 By default we guess this means that any C type is supported. If
393 we can't map the mode back to a type that would be available in C,
394 then reject it. Special case, here, is the double-word arithmetic
395 supported by optabs.c. */
398 default_scalar_mode_supported_p (machine_mode mode
)
400 int precision
= GET_MODE_PRECISION (mode
);
402 switch (GET_MODE_CLASS (mode
))
404 case MODE_PARTIAL_INT
:
406 if (precision
== CHAR_TYPE_SIZE
)
408 if (precision
== SHORT_TYPE_SIZE
)
410 if (precision
== INT_TYPE_SIZE
)
412 if (precision
== LONG_TYPE_SIZE
)
414 if (precision
== LONG_LONG_TYPE_SIZE
)
416 if (precision
== 2 * BITS_PER_WORD
)
421 if (precision
== FLOAT_TYPE_SIZE
)
423 if (precision
== DOUBLE_TYPE_SIZE
)
425 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
429 case MODE_DECIMAL_FLOAT
:
441 /* Return true if libgcc supports floating-point mode MODE (known to
442 be supported as a scalar mode). */
445 default_libgcc_floating_mode_supported_p (machine_mode mode
)
468 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
469 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
472 default_floatn_mode (int n
, bool extended
)
476 machine_mode cand1
= VOIDmode
, cand2
= VOIDmode
;
498 /* Those are the only valid _FloatNx types. */
501 if (cand1
!= VOIDmode
502 && REAL_MODE_FORMAT (cand1
)->ieee_bits
> n
503 && targetm
.scalar_mode_supported_p (cand1
)
504 && targetm
.libgcc_floating_mode_supported_p (cand1
))
506 if (cand2
!= VOIDmode
507 && REAL_MODE_FORMAT (cand2
)->ieee_bits
> n
508 && targetm
.scalar_mode_supported_p (cand2
)
509 && targetm
.libgcc_floating_mode_supported_p (cand2
))
514 machine_mode cand
= VOIDmode
;
518 /* Always enable _Float16 if we have basic support for the mode.
519 Targets can control the range and precision of operations on
520 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
548 && REAL_MODE_FORMAT (cand
)->ieee_bits
== n
549 && targetm
.scalar_mode_supported_p (cand
)
550 && targetm
.libgcc_floating_mode_supported_p (cand
))
556 /* Make some target macros useable by target-independent code. */
558 targhook_words_big_endian (void)
560 return !!WORDS_BIG_ENDIAN
;
564 targhook_float_words_big_endian (void)
566 return !!FLOAT_WORDS_BIG_ENDIAN
;
569 /* True if the target supports floating-point exceptions and rounding
573 default_float_exceptions_rounding_supported_p (void)
582 /* True if the target supports decimal floating point. */
585 default_decimal_float_supported_p (void)
587 return ENABLE_DECIMAL_FLOAT
;
590 /* True if the target supports fixed-point arithmetic. */
593 default_fixed_point_supported_p (void)
595 return ENABLE_FIXED_POINT
;
598 /* True if the target supports GNU indirect functions. */
601 default_has_ifunc_p (void)
603 return HAVE_GNU_INDIRECT_FUNCTION
;
606 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
609 This function checks whether a given INSN is valid within a low-overhead
610 loop. If INSN is invalid it returns the reason for that, otherwise it
611 returns NULL. A called function may clobber any special registers required
612 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
613 register for branch on table instructions. We reject the doloop pattern in
617 default_invalid_within_doloop (const rtx_insn
*insn
)
620 return "Function call in loop.";
622 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
623 return "Computed branch in the loop.";
628 /* Mapping of builtin functions to vectorized variants. */
631 default_builtin_vectorized_function (unsigned int, tree
, tree
)
636 /* Mapping of target builtin functions to vectorized variants. */
639 default_builtin_md_vectorized_function (tree
, tree
, tree
)
644 /* Vectorized conversion. */
647 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
648 tree dest_type ATTRIBUTE_UNUSED
,
649 tree src_type ATTRIBUTE_UNUSED
)
654 /* Default vectorizer cost model values. */
657 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
659 int misalign ATTRIBUTE_UNUSED
)
661 switch (type_of_cost
)
671 case cond_branch_not_taken
:
673 case vec_promote_demote
:
677 case unaligned_store
:
680 case cond_branch_taken
:
684 return TYPE_VECTOR_SUBPARTS (vectype
) - 1;
694 default_builtin_reciprocal (tree
)
700 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
701 cumulative_args_t ca ATTRIBUTE_UNUSED
,
702 machine_mode mode ATTRIBUTE_UNUSED
,
703 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
709 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
710 cumulative_args_t ca ATTRIBUTE_UNUSED
,
711 machine_mode mode ATTRIBUTE_UNUSED
,
712 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
718 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
719 cumulative_args_t ca ATTRIBUTE_UNUSED
,
720 machine_mode mode ATTRIBUTE_UNUSED
,
721 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
727 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
728 machine_mode mode ATTRIBUTE_UNUSED
,
729 const_tree type ATTRIBUTE_UNUSED
,
730 bool named ATTRIBUTE_UNUSED
)
736 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
737 machine_mode mode ATTRIBUTE_UNUSED
,
738 const_tree type ATTRIBUTE_UNUSED
,
739 bool named ATTRIBUTE_UNUSED
)
745 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
746 machine_mode mode ATTRIBUTE_UNUSED
,
747 const_tree type ATTRIBUTE_UNUSED
,
748 bool named ATTRIBUTE_UNUSED
)
754 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
755 const_tree type ATTRIBUTE_UNUSED
)
757 return PARM_BOUNDARY
;
761 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
762 const_tree type ATTRIBUTE_UNUSED
)
764 return PARM_BOUNDARY
;
768 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
773 hook_invalid_arg_for_unprototyped_fn (
774 const_tree typelist ATTRIBUTE_UNUSED
,
775 const_tree funcdecl ATTRIBUTE_UNUSED
,
776 const_tree val ATTRIBUTE_UNUSED
)
781 /* Initialize the stack protection decls. */
783 /* Stack protection related decls living in libgcc. */
784 static GTY(()) tree stack_chk_guard_decl
;
787 default_stack_protect_guard (void)
789 tree t
= stack_chk_guard_decl
;
795 t
= build_decl (UNKNOWN_LOCATION
,
796 VAR_DECL
, get_identifier ("__stack_chk_guard"),
800 DECL_EXTERNAL (t
) = 1;
802 TREE_THIS_VOLATILE (t
) = 1;
803 DECL_ARTIFICIAL (t
) = 1;
804 DECL_IGNORED_P (t
) = 1;
806 /* Do not share RTL as the declaration is visible outside of
809 RTX_FLAG (x
, used
) = 1;
811 stack_chk_guard_decl
= t
;
817 static GTY(()) tree stack_chk_fail_decl
;
820 default_external_stack_protect_fail (void)
822 tree t
= stack_chk_fail_decl
;
826 t
= build_function_type_list (void_type_node
, NULL_TREE
);
827 t
= build_decl (UNKNOWN_LOCATION
,
828 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
831 DECL_EXTERNAL (t
) = 1;
833 TREE_THIS_VOLATILE (t
) = 1;
834 TREE_NOTHROW (t
) = 1;
835 DECL_ARTIFICIAL (t
) = 1;
836 DECL_IGNORED_P (t
) = 1;
837 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
838 DECL_VISIBILITY_SPECIFIED (t
) = 1;
840 stack_chk_fail_decl
= t
;
843 return build_call_expr (t
, 0);
847 default_hidden_stack_protect_fail (void)
849 #ifndef HAVE_GAS_HIDDEN
850 return default_external_stack_protect_fail ();
852 tree t
= stack_chk_fail_decl
;
855 return default_external_stack_protect_fail ();
859 t
= build_function_type_list (void_type_node
, NULL_TREE
);
860 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
861 get_identifier ("__stack_chk_fail_local"), t
);
864 DECL_EXTERNAL (t
) = 1;
866 TREE_THIS_VOLATILE (t
) = 1;
867 TREE_NOTHROW (t
) = 1;
868 DECL_ARTIFICIAL (t
) = 1;
869 DECL_IGNORED_P (t
) = 1;
870 DECL_VISIBILITY_SPECIFIED (t
) = 1;
871 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
873 stack_chk_fail_decl
= t
;
876 return build_call_expr (t
, 0);
881 hook_bool_const_rtx_commutative_p (const_rtx x
,
882 int outer_code ATTRIBUTE_UNUSED
)
884 return COMMUTATIVE_P (x
);
888 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
889 const_tree fn_decl_or_type
,
890 bool outgoing ATTRIBUTE_UNUSED
)
892 /* The old interface doesn't handle receiving the function type. */
894 && !DECL_P (fn_decl_or_type
))
895 fn_decl_or_type
= NULL
;
897 #ifdef FUNCTION_VALUE
898 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
905 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
906 const_rtx fun ATTRIBUTE_UNUSED
)
909 return LIBCALL_VALUE (mode
);
915 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
918 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
920 #ifdef FUNCTION_VALUE_REGNO_P
921 return FUNCTION_VALUE_REGNO_P (regno
);
928 default_internal_arg_pointer (void)
930 /* If the reg that the virtual arg pointer will be translated into is
931 not a fixed reg or is the stack pointer, make a copy of the virtual
932 arg pointer, and address parms via the copy. The frame pointer is
933 considered fixed even though it is not marked as such. */
934 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
935 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
936 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
937 return copy_to_reg (virtual_incoming_args_rtx
);
939 return virtual_incoming_args_rtx
;
943 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
947 #ifdef STATIC_CHAIN_INCOMING_REGNUM
948 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
952 #ifdef STATIC_CHAIN_REGNUM
953 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
957 static bool issued_error
;
961 sorry ("nested functions not supported on this target");
964 /* It really doesn't matter what we return here, so long at it
965 doesn't cause the rest of the compiler to crash. */
966 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
971 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
972 rtx
ARG_UNUSED (r_chain
))
974 sorry ("nested function trampolines not supported on this target");
978 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
979 tree funtype ATTRIBUTE_UNUSED
,
980 int size ATTRIBUTE_UNUSED
)
986 default_branch_target_register_class (void)
992 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
994 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1000 default_lra_p (void)
1006 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1012 default_register_usage_leveling_p (void)
1018 default_different_addr_displacement_p (void)
1024 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1025 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1026 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1027 secondary_reload_info
*sri
)
1029 enum reg_class rclass
= NO_REGS
;
1030 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1032 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1034 sri
->icode
= sri
->prev_sri
->t_icode
;
1037 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1039 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
1041 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1043 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
1045 if (rclass
!= NO_REGS
)
1047 enum insn_code icode
1048 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1051 if (icode
!= CODE_FOR_nothing
1052 && !insn_operand_matches (icode
, in_p
, x
))
1053 icode
= CODE_FOR_nothing
;
1054 else if (icode
!= CODE_FOR_nothing
)
1056 const char *insn_constraint
, *scratch_constraint
;
1057 enum reg_class insn_class
, scratch_class
;
1059 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1060 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1061 if (!*insn_constraint
)
1062 insn_class
= ALL_REGS
;
1067 gcc_assert (*insn_constraint
== '=');
1070 insn_class
= (reg_class_for_constraint
1071 (lookup_constraint (insn_constraint
)));
1072 gcc_assert (insn_class
!= NO_REGS
);
1075 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1076 /* The scratch register's constraint must start with "=&",
1077 except for an input reload, where only "=" is necessary,
1078 and where it might be beneficial to re-use registers from
1080 gcc_assert (scratch_constraint
[0] == '='
1081 && (in_p
|| scratch_constraint
[1] == '&'));
1082 scratch_constraint
++;
1083 if (*scratch_constraint
== '&')
1084 scratch_constraint
++;
1085 scratch_class
= (reg_class_for_constraint
1086 (lookup_constraint (scratch_constraint
)));
1088 if (reg_class_subset_p (reload_class
, insn_class
))
1090 gcc_assert (scratch_class
== rclass
);
1094 rclass
= insn_class
;
1097 if (rclass
== NO_REGS
)
1100 sri
->t_icode
= icode
;
1105 /* By default, if flag_pic is true, then neither local nor global relocs
1106 should be placed in readonly memory. */
1109 default_reloc_rw_mask (void)
1111 return flag_pic
? 3 : 0;
1114 /* By default, do no modification. */
1115 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1121 /* Default to natural alignment for vector types. */
1123 default_vector_alignment (const_tree type
)
1125 HOST_WIDE_INT align
= tree_to_shwi (TYPE_SIZE (type
));
1126 if (align
> MAX_OFILE_ALIGNMENT
)
1127 align
= MAX_OFILE_ALIGNMENT
;
1131 /* By default assume vectors of element TYPE require a multiple of the natural
1132 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1134 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1139 /* By default, assume that a target supports any factor of misalignment
1140 memory access if it supports movmisalign patten.
1141 is_packed is true if the memory access is defined in a packed struct. */
1143 default_builtin_support_vector_misalignment (machine_mode mode
,
1151 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1156 /* By default, only attempt to parallelize bitwise operations, and
1157 possibly adds/subtracts using bit-twiddling. */
1160 default_preferred_simd_mode (machine_mode mode ATTRIBUTE_UNUSED
)
1165 /* By default only the size derived from the preferred vector mode
1169 default_autovectorize_vector_sizes (void)
1174 /* By defaults a vector of integers is used as a mask. */
1177 default_get_mask_mode (unsigned nunits
, unsigned vector_size
)
1179 unsigned elem_size
= vector_size
/ nunits
;
1180 machine_mode elem_mode
1181 = smallest_mode_for_size (elem_size
* BITS_PER_UNIT
, MODE_INT
);
1182 machine_mode vector_mode
;
1184 gcc_assert (elem_size
* nunits
== vector_size
);
1186 vector_mode
= mode_for_vector (elem_mode
, nunits
);
1187 if (!VECTOR_MODE_P (vector_mode
)
1188 || !targetm
.vector_mode_supported_p (vector_mode
))
1189 vector_mode
= BLKmode
;
1194 /* By default, the cost model accumulates three separate costs (prologue,
1195 loop body, and epilogue) for a vectorized loop or block. So allocate an
1196 array of three unsigned ints, set it to zero, and return its address. */
1199 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1201 unsigned *cost
= XNEWVEC (unsigned, 3);
1202 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1206 /* By default, the cost model looks up the cost of the given statement
1207 kind and mode, multiplies it by the occurrence count, accumulates
1208 it into the cost specified by WHERE, and returns the cost added. */
1211 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1212 struct _stmt_vec_info
*stmt_info
, int misalign
,
1213 enum vect_cost_model_location where
)
1215 unsigned *cost
= (unsigned *) data
;
1216 unsigned retval
= 0;
1218 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1219 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1221 /* Statements in an inner loop relative to the loop being
1222 vectorized are weighted more heavily. The value here is
1223 arbitrary and could potentially be improved with analysis. */
1224 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1225 count
*= 50; /* FIXME. */
1227 retval
= (unsigned) (count
* stmt_cost
);
1228 cost
[where
] += retval
;
1233 /* By default, the cost model just returns the accumulated costs. */
1236 default_finish_cost (void *data
, unsigned *prologue_cost
,
1237 unsigned *body_cost
, unsigned *epilogue_cost
)
1239 unsigned *cost
= (unsigned *) data
;
1240 *prologue_cost
= cost
[vect_prologue
];
1241 *body_cost
= cost
[vect_body
];
1242 *epilogue_cost
= cost
[vect_epilogue
];
1245 /* Free the cost data. */
1248 default_destroy_cost_data (void *data
)
1253 /* Determine whether or not a pointer mode is valid. Assume defaults
1254 of ptr_mode or Pmode - can be overridden. */
1256 default_valid_pointer_mode (machine_mode mode
)
1258 return (mode
== ptr_mode
|| mode
== Pmode
);
1261 /* Determine whether the memory reference specified by REF may alias
1262 the C libraries errno location. */
1264 default_ref_may_alias_errno (ao_ref
*ref
)
1266 tree base
= ao_ref_base (ref
);
1267 /* The default implementation assumes the errno location is
1268 a declaration of type int or is always accessed via a
1269 pointer to int. We assume that accesses to errno are
1270 not deliberately obfuscated (even in conforming ways). */
1271 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1272 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1274 /* The default implementation assumes an errno location
1275 declaration is never defined in the current compilation unit. */
1277 && !TREE_STATIC (base
))
1279 else if (TREE_CODE (base
) == MEM_REF
1280 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1282 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1283 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1288 /* Return the mode for a pointer to a given ADDRSPACE,
1289 defaulting to ptr_mode for all address spaces. */
1292 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1297 /* Return the mode for an address in a given ADDRSPACE,
1298 defaulting to Pmode for all address spaces. */
1301 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1306 /* Named address space version of valid_pointer_mode.
1307 To match the above, the same modes apply to all address spaces. */
1310 default_addr_space_valid_pointer_mode (machine_mode mode
,
1311 addr_space_t as ATTRIBUTE_UNUSED
)
1313 return targetm
.valid_pointer_mode (mode
);
1316 /* Some places still assume that all pointer or address modes are the
1317 standard Pmode and ptr_mode. These optimizations become invalid if
1318 the target actually supports multiple different modes. For now,
1319 we disable such optimizations on such targets, using this function. */
1322 target_default_pointer_address_modes_p (void)
1324 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1326 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1332 /* Named address space version of legitimate_address_p.
1333 By default, all address spaces have the same form. */
1336 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1338 addr_space_t as ATTRIBUTE_UNUSED
)
1340 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1343 /* Named address space version of LEGITIMIZE_ADDRESS.
1344 By default, all address spaces have the same form. */
1347 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1348 addr_space_t as ATTRIBUTE_UNUSED
)
1350 return targetm
.legitimize_address (x
, oldx
, mode
);
1353 /* The default hook for determining if one named address space is a subset of
1354 another and to return which address space to use as the common address
1358 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1360 return (subset
== superset
);
1363 /* The default hook for determining if 0 within a named address
1364 space is a valid address. */
1367 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1372 /* The default hook for debugging the address space is to return the
1373 address space number to indicate DW_AT_address_class. */
1375 default_addr_space_debug (addr_space_t as
)
1380 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1381 Don't complain about any address space. */
1384 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1389 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1390 called for targets with only a generic address space. */
1393 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1394 tree from_type ATTRIBUTE_UNUSED
,
1395 tree to_type ATTRIBUTE_UNUSED
)
1401 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1406 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1409 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1410 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1416 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1417 tree
ARG_UNUSED (name
),
1418 tree
ARG_UNUSED (args
),
1419 int ARG_UNUSED (flags
))
1421 warning (OPT_Wattributes
,
1422 "target attribute is not supported on this machine");
1428 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1429 tree
ARG_UNUSED (pop_target
))
1431 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1432 emit no warning because "#pragma GCC pop_target" is valid on targets that
1433 do not have the "target" pragma. */
1435 warning (OPT_Wpragmas
,
1436 "#pragma GCC target is not supported for this machine");
1442 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 /* If callee has no option attributes, then it is ok to inline */
1452 /* If caller has no option attributes, but callee does then it is not ok to
1454 else if (!caller_opts
)
1457 /* If both caller and callee have attributes, assume that if the
1458 pointer is different, the two functions have different target
1459 options since build_target_option_node uses a hash table for the
1462 ret
= (callee_opts
== caller_opts
);
1467 /* If the machine does not have a case insn that compares the bounds,
1468 this means extra overhead for dispatch tables, which raises the
1469 threshold for using them. */
1472 default_case_values_threshold (void)
1474 return (targetm
.have_casesi () ? 4 : 5);
1478 default_have_conditional_execution (void)
1480 return HAVE_conditional_execution
;
1483 /* By default we assume that c99 functions are present at the runtime,
1484 but sincos is not. */
1486 default_libc_has_function (enum function_class fn_class
)
1488 if (fn_class
== function_c94
1489 || fn_class
== function_c99_misc
1490 || fn_class
== function_c99_math_complex
)
1497 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1503 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1509 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1514 /* Compute cost of moving registers to/from memory. */
1517 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1518 reg_class_t rclass ATTRIBUTE_UNUSED
,
1519 bool in ATTRIBUTE_UNUSED
)
1521 #ifndef MEMORY_MOVE_COST
1522 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1524 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1528 /* Compute cost of moving data from a register of class FROM to one of
1532 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1533 reg_class_t from ATTRIBUTE_UNUSED
,
1534 reg_class_t to ATTRIBUTE_UNUSED
)
1536 #ifndef REGISTER_MOVE_COST
1539 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1543 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1544 behavior. SPEED_P is true if we are compiling for speed. */
1547 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1549 unsigned int move_ratio
;
1551 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1553 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1555 #else /* No movmem patterns, pick a default. */
1556 move_ratio
= ((speed_p
) ? 15 : 3);
1562 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1563 used; return FALSE if the movmem/setmem optab should be expanded, or
1564 a call to memcpy emitted. */
1567 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1568 unsigned int alignment
,
1569 enum by_pieces_operation op
,
1572 unsigned int max_size
= 0;
1573 unsigned int ratio
= 0;
1577 case CLEAR_BY_PIECES
:
1578 max_size
= STORE_MAX_PIECES
;
1579 ratio
= CLEAR_RATIO (speed_p
);
1581 case MOVE_BY_PIECES
:
1582 max_size
= MOVE_MAX_PIECES
;
1583 ratio
= get_move_ratio (speed_p
);
1586 max_size
= STORE_MAX_PIECES
;
1587 ratio
= SET_RATIO (speed_p
);
1589 case STORE_BY_PIECES
:
1590 max_size
= STORE_MAX_PIECES
;
1591 ratio
= get_move_ratio (speed_p
);
1593 case COMPARE_BY_PIECES
:
1594 max_size
= COMPARE_MAX_PIECES
;
1595 /* Pick a likely default, just as in get_move_ratio. */
1596 ratio
= speed_p
? 15 : 3;
1600 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1603 /* This hook controls code generation for expanding a memcmp operation by
1604 pieces. Return 1 for the normal pattern of compare/jump after each pair
1605 of loads, or a higher number to reduce the number of branches. */
1608 default_compare_by_pieces_branch_ratio (machine_mode
)
1614 default_profile_before_prologue (void)
1616 #ifdef PROFILE_BEFORE_PROLOGUE
1623 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1626 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1629 #ifdef PREFERRED_RELOAD_CLASS
1630 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1636 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1639 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1645 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1647 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1652 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1655 default_class_likely_spilled_p (reg_class_t rclass
)
1657 return (reg_class_size
[(int) rclass
] == 1);
1660 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1663 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1664 machine_mode mode ATTRIBUTE_UNUSED
)
1666 #ifdef CLASS_MAX_NREGS
1667 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1669 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1673 /* Determine the debugging unwind mechanism for the target. */
1675 enum unwind_info_type
1676 default_debug_unwind_info (void)
1678 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1679 /* ??? Change all users to the hook, then poison this. */
1680 #ifdef DWARF2_FRAME_INFO
1681 if (DWARF2_FRAME_INFO
)
1685 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1686 #ifdef DWARF2_DEBUGGING_INFO
1687 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1694 /* Determine the correct mode for a Dwarf frame register that represents
1698 default_dwarf_frame_reg_mode (int regno
)
1700 machine_mode save_mode
= reg_raw_mode
[regno
];
1702 if (HARD_REGNO_CALL_PART_CLOBBERED (regno
, save_mode
))
1703 save_mode
= choose_hard_reg_mode (regno
, 1, true);
1707 /* To be used by targets where reg_raw_mode doesn't return the right
1708 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1711 default_get_reg_raw_mode (int regno
)
1713 return reg_raw_mode
[regno
];
1716 /* Return true if a leaf function should stay leaf even with profiling
1720 default_keep_leaf_when_profiled ()
1725 /* Return true if the state of option OPTION should be stored in PCH files
1726 and checked by default_pch_valid_p. Store the option's current state
1730 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1732 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1734 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1736 if (option_flag_var (option
, &global_options
) == &target_flags
)
1737 if (targetm
.check_pch_target_flags
)
1739 return get_option_state (&global_options
, option
, state
);
1742 /* Default version of get_pch_validity.
1743 By default, every flag difference is fatal; that will be mostly right for
1744 most targets, but completely right for very few. */
1747 default_get_pch_validity (size_t *sz
)
1749 struct cl_option_state state
;
1754 if (targetm
.check_pch_target_flags
)
1755 *sz
+= sizeof (target_flags
);
1756 for (i
= 0; i
< cl_options_count
; i
++)
1757 if (option_affects_pch_p (i
, &state
))
1760 result
= r
= XNEWVEC (char, *sz
);
1764 if (targetm
.check_pch_target_flags
)
1766 memcpy (r
, &target_flags
, sizeof (target_flags
));
1767 r
+= sizeof (target_flags
);
1770 for (i
= 0; i
< cl_options_count
; i
++)
1771 if (option_affects_pch_p (i
, &state
))
1773 memcpy (r
, state
.data
, state
.size
);
1780 /* Return a message which says that a PCH file was created with a different
1781 setting of OPTION. */
1784 pch_option_mismatch (const char *option
)
1786 return xasprintf (_("created and used with differing settings of '%s'"),
1790 /* Default version of pch_valid_p. */
1793 default_pch_valid_p (const void *data_p
, size_t len
)
1795 struct cl_option_state state
;
1796 const char *data
= (const char *)data_p
;
1799 /* -fpic and -fpie also usually make a PCH invalid. */
1800 if (data
[0] != flag_pic
)
1801 return _("created and used with different settings of -fpic");
1802 if (data
[1] != flag_pie
)
1803 return _("created and used with different settings of -fpie");
1806 /* Check target_flags. */
1807 if (targetm
.check_pch_target_flags
)
1812 memcpy (&tf
, data
, sizeof (target_flags
));
1813 data
+= sizeof (target_flags
);
1814 len
-= sizeof (target_flags
);
1815 r
= targetm
.check_pch_target_flags (tf
);
1820 for (i
= 0; i
< cl_options_count
; i
++)
1821 if (option_affects_pch_p (i
, &state
))
1823 if (memcmp (data
, state
.data
, state
.size
) != 0)
1824 return pch_option_mismatch (cl_options
[i
].opt_text
);
1832 /* Default version of cstore_mode. */
1835 default_cstore_mode (enum insn_code icode
)
1837 return insn_data
[(int) icode
].operand
[0].mode
;
1840 /* Default version of member_type_forces_blk. */
1843 default_member_type_forces_blk (const_tree
, machine_mode
)
1849 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
1850 rtx ptr ATTRIBUTE_UNUSED
,
1851 rtx bnd ATTRIBUTE_UNUSED
)
1857 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
1858 rtx addr ATTRIBUTE_UNUSED
,
1859 rtx bounds ATTRIBUTE_UNUSED
,
1860 rtx to ATTRIBUTE_UNUSED
)
1866 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
1872 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
1873 rtx bounds ATTRIBUTE_UNUSED
)
1878 /* Default version of canonicalize_comparison. */
1881 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1885 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
1888 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
1892 #ifndef PAD_VARARGS_DOWN
1893 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
1896 /* Build an indirect-ref expression over the given TREE, which represents a
1897 piece of a va_arg() expansion. */
1899 build_va_arg_indirect_ref (tree addr
)
1901 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
1905 /* The "standard" implementation of va_arg: read the value from the
1906 current (padded) address and increment by the (padded) size. */
1909 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
1912 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
1913 unsigned HOST_WIDE_INT align
, boundary
;
1916 /* All of the alignment and movement below is for args-grow-up machines.
1917 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
1918 implement their own specialized gimplify_va_arg_expr routines. */
1919 if (ARGS_GROW_DOWNWARD
)
1922 indirect
= pass_by_reference (NULL
, TYPE_MODE (type
), type
, false);
1924 type
= build_pointer_type (type
);
1926 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
1927 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
1929 /* When we align parameter on stack for caller, if the parameter
1930 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
1931 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
1932 here with caller. */
1933 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
1934 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
1936 boundary
/= BITS_PER_UNIT
;
1938 /* Hoist the valist value into a temporary for the moment. */
1939 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
1941 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
1942 requires greater alignment, we must perform dynamic alignment. */
1943 if (boundary
> align
1944 && !integer_zerop (TYPE_SIZE (type
)))
1946 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1947 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
1948 gimplify_and_add (t
, pre_p
);
1950 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1951 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
1953 build_int_cst (TREE_TYPE (valist
), -boundary
)));
1954 gimplify_and_add (t
, pre_p
);
1959 /* If the actual alignment is less than the alignment of the type,
1960 adjust the type accordingly so that we don't assume strict alignment
1961 when dereferencing the pointer. */
1962 boundary
*= BITS_PER_UNIT
;
1963 if (boundary
< TYPE_ALIGN (type
))
1965 type
= build_variant_type_copy (type
);
1966 SET_TYPE_ALIGN (type
, boundary
);
1969 /* Compute the rounded size of the type. */
1970 type_size
= size_in_bytes (type
);
1971 rounded_size
= round_up (type_size
, align
);
1973 /* Reduce rounded_size so it's sharable with the postqueue. */
1974 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
1978 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
1980 /* Small args are padded downward. */
1981 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
1982 rounded_size
, size_int (align
));
1983 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
1984 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
1985 addr
= fold_build_pointer_plus (addr
, t
);
1988 /* Compute new value for AP. */
1989 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
1990 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
1991 gimplify_and_add (t
, pre_p
);
1993 addr
= fold_convert (build_pointer_type (type
), addr
);
1996 addr
= build_va_arg_indirect_ref (addr
);
1998 return build_va_arg_indirect_ref (addr
);
2002 default_chkp_bound_type (void)
2004 tree res
= make_node (POINTER_BOUNDS_TYPE
);
2005 TYPE_PRECISION (res
) = TYPE_PRECISION (size_type_node
) * 2;
2006 TYPE_NAME (res
) = get_identifier ("__bounds_type");
2007 SET_TYPE_MODE (res
, targetm
.chkp_bound_mode ());
2013 default_chkp_bound_mode (void)
2019 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED
)
2025 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED
,
2026 const_tree fn_decl_or_type ATTRIBUTE_UNUSED
,
2027 bool outgoing ATTRIBUTE_UNUSED
)
2033 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED
,
2034 HOST_WIDE_INT ub ATTRIBUTE_UNUSED
)
2040 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED
,
2041 tree lb ATTRIBUTE_UNUSED
,
2042 tree ub ATTRIBUTE_UNUSED
,
2043 tree
*stmts ATTRIBUTE_UNUSED
)
2049 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED
,
2050 enum machine_mode mode ATTRIBUTE_UNUSED
,
2051 tree type ATTRIBUTE_UNUSED
,
2052 int *pretend_arg_size ATTRIBUTE_UNUSED
,
2053 int second_time ATTRIBUTE_UNUSED
)
2057 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2058 not support nested low-overhead loops. */
2061 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2062 unsigned int loop_depth
, bool)
2064 return loop_depth
== 1;
2067 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2070 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2075 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2078 default_max_noce_ifcvt_seq_cost (edge e
)
2080 bool predictable_p
= predictable_edge_p (e
);
2082 enum compiler_param param
2084 ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2085 : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST
);
2087 /* If we have a parameter set, use that, otherwise take a guess using
2089 if (global_options_set
.x_param_values
[param
])
2090 return PARAM_VALUE (param
);
2092 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2095 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2098 default_min_arithmetic_precision (void)
2100 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2103 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2105 enum flt_eval_method
2106 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2108 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2111 #include "gt-targhooks.h"