1 /* Default target hook functions.
2 Copyright (C) 2003-2020 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"
83 #include "langhooks.h"
85 #include "function-abi.h"
88 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
89 rtx addr ATTRIBUTE_UNUSED
,
90 bool strict ATTRIBUTE_UNUSED
)
92 #ifdef GO_IF_LEGITIMATE_ADDRESS
93 /* Defer to the old implementation using a goto. */
95 return strict_memory_address_p (mode
, addr
);
97 return memory_address_p (mode
, addr
);
104 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
106 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
107 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
112 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
116 /* Any floating arithmetic may trap. */
117 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
120 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
122 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
130 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
132 int *punsignedp ATTRIBUTE_UNUSED
,
133 const_tree funtype ATTRIBUTE_UNUSED
,
134 int for_return ATTRIBUTE_UNUSED
)
136 if (type
!= NULL_TREE
&& for_return
== 2)
137 return promote_mode (type
, mode
, punsignedp
);
142 default_promote_function_mode_always_promote (const_tree type
,
145 const_tree funtype ATTRIBUTE_UNUSED
,
146 int for_return ATTRIBUTE_UNUSED
)
148 return promote_mode (type
, mode
, punsignedp
);
152 default_cc_modes_compatible (machine_mode m1
, machine_mode m2
)
160 default_return_in_memory (const_tree type
,
161 const_tree fntype ATTRIBUTE_UNUSED
)
163 return (TYPE_MODE (type
) == BLKmode
);
167 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
168 machine_mode mode ATTRIBUTE_UNUSED
)
174 default_legitimize_address_displacement (rtx
*, rtx
*, poly_int64
,
181 default_const_not_ok_for_debug_p (rtx x
)
183 if (GET_CODE (x
) == UNSPEC
)
189 default_expand_builtin_saveregs (void)
191 error ("%<__builtin_saveregs%> not supported by this target");
196 default_setup_incoming_varargs (cumulative_args_t
,
197 const function_arg_info
&, int *, int)
201 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
204 default_builtin_setjmp_frame_value (void)
206 return virtual_stack_vars_rtx
;
209 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
212 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
218 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
220 return (targetm
.calls
.setup_incoming_varargs
221 != default_setup_incoming_varargs
);
225 default_eh_return_filter_mode (void)
227 return targetm
.unwind_word_mode ();
231 default_libgcc_cmp_return_mode (void)
237 default_libgcc_shift_count_mode (void)
243 default_unwind_word_mode (void)
248 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
250 unsigned HOST_WIDE_INT
251 default_shift_truncation_mask (machine_mode mode
)
253 return SHIFT_COUNT_TRUNCATED
? GET_MODE_UNIT_BITSIZE (mode
) - 1 : 0;
256 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
259 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED
)
261 return have_insn_for (DIV
, mode
) ? 3 : 2;
264 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
267 default_mode_rep_extended (scalar_int_mode
, scalar_int_mode
)
272 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
275 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
280 /* Return machine mode for non-standard suffix
281 or VOIDmode if non-standard suffixes are unsupported. */
283 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
288 /* The generic C++ ABI specifies this is a 64-bit value. */
290 default_cxx_guard_type (void)
292 return long_long_integer_type_node
;
295 /* Returns the size of the cookie to use when allocating an array
296 whose elements have the indicated TYPE. Assumes that it is already
297 known that a cookie is needed. */
300 default_cxx_get_cookie_size (tree type
)
304 /* We need to allocate an additional max (sizeof (size_t), alignof
305 (true_type)) bytes. */
309 sizetype_size
= size_in_bytes (sizetype
);
310 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
311 if (tree_int_cst_lt (type_align
, sizetype_size
))
312 cookie_size
= sizetype_size
;
314 cookie_size
= type_align
;
319 /* Return true if a parameter must be passed by reference. This version
320 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
323 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t
,
324 const function_arg_info
&arg
)
326 return targetm
.calls
.must_pass_in_stack (arg
);
329 /* Return true if a parameter follows callee copies conventions. This
330 version of the hook is true for all named arguments. */
333 hook_callee_copies_named (cumulative_args_t
, const function_arg_info
&arg
)
338 /* Emit to STREAM the assembler syntax for insn operand X. */
341 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
342 int code ATTRIBUTE_UNUSED
)
345 PRINT_OPERAND (stream
, x
, code
);
351 /* Emit to STREAM the assembler syntax for an insn operand whose memory
355 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
356 machine_mode
/*mode*/,
357 rtx x ATTRIBUTE_UNUSED
)
359 #ifdef PRINT_OPERAND_ADDRESS
360 PRINT_OPERAND_ADDRESS (stream
, x
);
366 /* Return true if CODE is a valid punctuation character for the
367 `print_operand' hook. */
370 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
372 #ifdef PRINT_OPERAND_PUNCT_VALID_P
373 return PRINT_OPERAND_PUNCT_VALID_P (code
);
379 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
381 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
383 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
384 const char *stripped
= targetm
.strip_name_encoding (skipped
);
385 if (*name
!= '*' && user_label_prefix
[0])
386 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
387 return get_identifier (stripped
);
390 /* The default implementation of TARGET_TRANSLATE_MODE_ATTRIBUTE. */
393 default_translate_mode_attribute (machine_mode mode
)
398 /* True if MODE is valid for the target. By "valid", we mean able to
399 be manipulated in non-trivial ways. In particular, this means all
400 the arithmetic is supported.
402 By default we guess this means that any C type is supported. If
403 we can't map the mode back to a type that would be available in C,
404 then reject it. Special case, here, is the double-word arithmetic
405 supported by optabs.c. */
408 default_scalar_mode_supported_p (scalar_mode mode
)
410 int precision
= GET_MODE_PRECISION (mode
);
412 switch (GET_MODE_CLASS (mode
))
414 case MODE_PARTIAL_INT
:
416 if (precision
== CHAR_TYPE_SIZE
)
418 if (precision
== SHORT_TYPE_SIZE
)
420 if (precision
== INT_TYPE_SIZE
)
422 if (precision
== LONG_TYPE_SIZE
)
424 if (precision
== LONG_LONG_TYPE_SIZE
)
426 if (precision
== 2 * BITS_PER_WORD
)
431 if (precision
== FLOAT_TYPE_SIZE
)
433 if (precision
== DOUBLE_TYPE_SIZE
)
435 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
439 case MODE_DECIMAL_FLOAT
:
451 /* Return true if libgcc supports floating-point mode MODE (known to
452 be supported as a scalar mode). */
455 default_libgcc_floating_mode_supported_p (scalar_float_mode mode
)
478 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
479 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
481 opt_scalar_float_mode
482 default_floatn_mode (int n
, bool extended
)
486 opt_scalar_float_mode cand1
, cand2
;
487 scalar_float_mode mode
;
509 /* Those are the only valid _FloatNx types. */
512 if (cand1
.exists (&mode
)
513 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
514 && targetm
.scalar_mode_supported_p (mode
)
515 && targetm
.libgcc_floating_mode_supported_p (mode
))
517 if (cand2
.exists (&mode
)
518 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
519 && targetm
.scalar_mode_supported_p (mode
)
520 && targetm
.libgcc_floating_mode_supported_p (mode
))
525 opt_scalar_float_mode cand
;
526 scalar_float_mode mode
;
530 /* Always enable _Float16 if we have basic support for the mode.
531 Targets can control the range and precision of operations on
532 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
559 if (cand
.exists (&mode
)
560 && REAL_MODE_FORMAT (mode
)->ieee_bits
== n
561 && targetm
.scalar_mode_supported_p (mode
)
562 && targetm
.libgcc_floating_mode_supported_p (mode
))
565 return opt_scalar_float_mode ();
568 /* Define this to return true if the _Floatn and _Floatnx built-in functions
569 should implicitly enable the built-in function without the __builtin_ prefix
570 in addition to the normal built-in function with the __builtin_ prefix. The
571 default is to only enable built-in functions without the __builtin_ prefix
572 for the GNU C langauge. The argument FUNC is the enum builtin_in_function
573 id of the function to be enabled. */
576 default_floatn_builtin_p (int func ATTRIBUTE_UNUSED
)
578 static bool first_time_p
= true;
579 static bool c_or_objective_c
;
583 first_time_p
= false;
584 c_or_objective_c
= lang_GNU_C () || lang_GNU_OBJC ();
587 return c_or_objective_c
;
590 /* Make some target macros useable by target-independent code. */
592 targhook_words_big_endian (void)
594 return !!WORDS_BIG_ENDIAN
;
598 targhook_float_words_big_endian (void)
600 return !!FLOAT_WORDS_BIG_ENDIAN
;
603 /* True if the target supports floating-point exceptions and rounding
607 default_float_exceptions_rounding_supported_p (void)
616 /* True if the target supports decimal floating point. */
619 default_decimal_float_supported_p (void)
621 return ENABLE_DECIMAL_FLOAT
;
624 /* True if the target supports fixed-point arithmetic. */
627 default_fixed_point_supported_p (void)
629 return ENABLE_FIXED_POINT
;
632 /* True if the target supports GNU indirect functions. */
635 default_has_ifunc_p (void)
637 return HAVE_GNU_INDIRECT_FUNCTION
;
640 /* Return true if we predict the loop LOOP will be transformed to a
641 low-overhead loop, otherwise return false.
643 By default, false is returned, as this hook's applicability should be
644 verified for each target. Target maintainers should re-define the hook
645 if the target can take advantage of it. */
648 default_predict_doloop_p (class loop
*loop ATTRIBUTE_UNUSED
)
653 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
656 This function checks whether a given INSN is valid within a low-overhead
657 loop. If INSN is invalid it returns the reason for that, otherwise it
658 returns NULL. A called function may clobber any special registers required
659 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
660 register for branch on table instructions. We reject the doloop pattern in
664 default_invalid_within_doloop (const rtx_insn
*insn
)
667 return "Function call in loop.";
669 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
670 return "Computed branch in the loop.";
675 /* Mapping of builtin functions to vectorized variants. */
678 default_builtin_vectorized_function (unsigned int, tree
, tree
)
683 /* Mapping of target builtin functions to vectorized variants. */
686 default_builtin_md_vectorized_function (tree
, tree
, tree
)
691 /* Default vectorizer cost model values. */
694 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
696 int misalign ATTRIBUTE_UNUSED
)
698 switch (type_of_cost
)
708 case cond_branch_not_taken
:
710 case vec_promote_demote
:
714 case unaligned_store
:
717 case cond_branch_taken
:
721 return estimated_poly_value (TYPE_VECTOR_SUBPARTS (vectype
)) - 1;
731 default_builtin_reciprocal (tree
)
737 hook_bool_CUMULATIVE_ARGS_arg_info_false (cumulative_args_t
,
738 const function_arg_info
&)
744 hook_bool_CUMULATIVE_ARGS_arg_info_true (cumulative_args_t
,
745 const function_arg_info
&)
751 hook_int_CUMULATIVE_ARGS_arg_info_0 (cumulative_args_t
,
752 const function_arg_info
&)
758 hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED
,
759 tree ATTRIBUTE_UNUSED
)
764 default_function_arg_advance (cumulative_args_t
, const function_arg_info
&)
769 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET. */
772 default_function_arg_offset (machine_mode
, const_tree
)
777 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
778 upward, but pad short args downward on big-endian machines. */
781 default_function_arg_padding (machine_mode mode
, const_tree type
)
783 if (!BYTES_BIG_ENDIAN
)
786 unsigned HOST_WIDE_INT size
;
789 if (!type
|| TREE_CODE (TYPE_SIZE (type
)) != INTEGER_CST
)
791 size
= int_size_in_bytes (type
);
794 /* Targets with variable-sized modes must override this hook
795 and handle variable-sized modes explicitly. */
796 size
= GET_MODE_SIZE (mode
).to_constant ();
798 if (size
< (PARM_BOUNDARY
/ BITS_PER_UNIT
))
805 default_function_arg (cumulative_args_t
, const function_arg_info
&)
811 default_function_incoming_arg (cumulative_args_t
, const function_arg_info
&)
817 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
818 const_tree type ATTRIBUTE_UNUSED
)
820 return PARM_BOUNDARY
;
824 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
825 const_tree type ATTRIBUTE_UNUSED
)
827 return PARM_BOUNDARY
;
831 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
836 hook_invalid_arg_for_unprototyped_fn (
837 const_tree typelist ATTRIBUTE_UNUSED
,
838 const_tree funcdecl ATTRIBUTE_UNUSED
,
839 const_tree val ATTRIBUTE_UNUSED
)
844 /* Initialize the stack protection decls. */
846 /* Stack protection related decls living in libgcc. */
847 static GTY(()) tree stack_chk_guard_decl
;
850 default_stack_protect_guard (void)
852 tree t
= stack_chk_guard_decl
;
858 t
= build_decl (UNKNOWN_LOCATION
,
859 VAR_DECL
, get_identifier ("__stack_chk_guard"),
863 DECL_EXTERNAL (t
) = 1;
865 TREE_THIS_VOLATILE (t
) = 1;
866 DECL_ARTIFICIAL (t
) = 1;
867 DECL_IGNORED_P (t
) = 1;
869 /* Do not share RTL as the declaration is visible outside of
872 RTX_FLAG (x
, used
) = 1;
874 stack_chk_guard_decl
= t
;
880 static GTY(()) tree stack_chk_fail_decl
;
883 default_external_stack_protect_fail (void)
885 tree t
= stack_chk_fail_decl
;
889 t
= build_function_type_list (void_type_node
, NULL_TREE
);
890 t
= build_decl (UNKNOWN_LOCATION
,
891 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
894 DECL_EXTERNAL (t
) = 1;
896 TREE_THIS_VOLATILE (t
) = 1;
897 TREE_NOTHROW (t
) = 1;
898 DECL_ARTIFICIAL (t
) = 1;
899 DECL_IGNORED_P (t
) = 1;
900 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
901 DECL_VISIBILITY_SPECIFIED (t
) = 1;
903 stack_chk_fail_decl
= t
;
906 return build_call_expr (t
, 0);
910 default_hidden_stack_protect_fail (void)
912 #ifndef HAVE_GAS_HIDDEN
913 return default_external_stack_protect_fail ();
915 tree t
= stack_chk_fail_decl
;
918 return default_external_stack_protect_fail ();
922 t
= build_function_type_list (void_type_node
, NULL_TREE
);
923 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
924 get_identifier ("__stack_chk_fail_local"), t
);
927 DECL_EXTERNAL (t
) = 1;
929 TREE_THIS_VOLATILE (t
) = 1;
930 TREE_NOTHROW (t
) = 1;
931 DECL_ARTIFICIAL (t
) = 1;
932 DECL_IGNORED_P (t
) = 1;
933 DECL_VISIBILITY_SPECIFIED (t
) = 1;
934 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
936 stack_chk_fail_decl
= t
;
939 return build_call_expr (t
, 0);
944 hook_bool_const_rtx_commutative_p (const_rtx x
,
945 int outer_code ATTRIBUTE_UNUSED
)
947 return COMMUTATIVE_P (x
);
951 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
952 const_tree fn_decl_or_type
,
953 bool outgoing ATTRIBUTE_UNUSED
)
955 /* The old interface doesn't handle receiving the function type. */
957 && !DECL_P (fn_decl_or_type
))
958 fn_decl_or_type
= NULL
;
960 #ifdef FUNCTION_VALUE
961 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
968 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
969 const_rtx fun ATTRIBUTE_UNUSED
)
972 return LIBCALL_VALUE (MACRO_MODE (mode
));
978 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
981 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
983 #ifdef FUNCTION_VALUE_REGNO_P
984 return FUNCTION_VALUE_REGNO_P (regno
);
991 default_internal_arg_pointer (void)
993 /* If the reg that the virtual arg pointer will be translated into is
994 not a fixed reg or is the stack pointer, make a copy of the virtual
995 arg pointer, and address parms via the copy. The frame pointer is
996 considered fixed even though it is not marked as such. */
997 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
998 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
999 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
1000 return copy_to_reg (virtual_incoming_args_rtx
);
1002 return virtual_incoming_args_rtx
;
1006 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
1010 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1011 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
1015 #ifdef STATIC_CHAIN_REGNUM
1016 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
1020 static bool issued_error
;
1023 issued_error
= true;
1024 sorry ("nested functions not supported on this target");
1027 /* It really doesn't matter what we return here, so long at it
1028 doesn't cause the rest of the compiler to crash. */
1029 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
1034 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
1035 rtx
ARG_UNUSED (r_chain
))
1037 sorry ("nested function trampolines not supported on this target");
1041 default_return_pops_args (tree
, tree
, poly_int64
)
1047 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
1049 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1055 default_lra_p (void)
1061 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1067 default_register_usage_leveling_p (void)
1073 default_different_addr_displacement_p (void)
1079 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1080 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1081 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1082 secondary_reload_info
*sri
)
1084 enum reg_class rclass
= NO_REGS
;
1085 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1087 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1089 sri
->icode
= sri
->prev_sri
->t_icode
;
1092 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1094 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
,
1095 MACRO_MODE (reload_mode
), x
);
1097 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1099 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
,
1100 MACRO_MODE (reload_mode
), x
);
1102 if (rclass
!= NO_REGS
)
1104 enum insn_code icode
1105 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1108 if (icode
!= CODE_FOR_nothing
1109 && !insn_operand_matches (icode
, in_p
, x
))
1110 icode
= CODE_FOR_nothing
;
1111 else if (icode
!= CODE_FOR_nothing
)
1113 const char *insn_constraint
, *scratch_constraint
;
1114 enum reg_class insn_class
, scratch_class
;
1116 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1117 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1118 if (!*insn_constraint
)
1119 insn_class
= ALL_REGS
;
1124 gcc_assert (*insn_constraint
== '=');
1127 insn_class
= (reg_class_for_constraint
1128 (lookup_constraint (insn_constraint
)));
1129 gcc_assert (insn_class
!= NO_REGS
);
1132 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1133 /* The scratch register's constraint must start with "=&",
1134 except for an input reload, where only "=" is necessary,
1135 and where it might be beneficial to re-use registers from
1137 gcc_assert (scratch_constraint
[0] == '='
1138 && (in_p
|| scratch_constraint
[1] == '&'));
1139 scratch_constraint
++;
1140 if (*scratch_constraint
== '&')
1141 scratch_constraint
++;
1142 scratch_class
= (reg_class_for_constraint
1143 (lookup_constraint (scratch_constraint
)));
1145 if (reg_class_subset_p (reload_class
, insn_class
))
1147 gcc_assert (scratch_class
== rclass
);
1151 rclass
= insn_class
;
1154 if (rclass
== NO_REGS
)
1157 sri
->t_icode
= icode
;
1162 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE. */
1165 default_secondary_memory_needed_mode (machine_mode mode
)
1167 if (!targetm
.lra_p ()
1168 && known_lt (GET_MODE_BITSIZE (mode
), BITS_PER_WORD
)
1169 && INTEGRAL_MODE_P (mode
))
1170 return mode_for_size (BITS_PER_WORD
, GET_MODE_CLASS (mode
), 0).require ();
1174 /* By default, if flag_pic is true, then neither local nor global relocs
1175 should be placed in readonly memory. */
1178 default_reloc_rw_mask (void)
1180 return flag_pic
? 3 : 0;
1183 /* By default, address diff vectors are generated
1184 for jump tables when flag_pic is true. */
1187 default_generate_pic_addr_diff_vec (void)
1192 /* By default, do no modification. */
1193 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1199 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT. */
1202 default_static_rtx_alignment (machine_mode mode
)
1204 return GET_MODE_ALIGNMENT (mode
);
1207 /* The default implementation of TARGET_CONSTANT_ALIGNMENT. */
1210 default_constant_alignment (const_tree
, HOST_WIDE_INT align
)
1215 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1216 to at least BITS_PER_WORD but otherwise makes no changes. */
1219 constant_alignment_word_strings (const_tree exp
, HOST_WIDE_INT align
)
1221 if (TREE_CODE (exp
) == STRING_CST
)
1222 return MAX (align
, BITS_PER_WORD
);
1226 /* Default to natural alignment for vector types, bounded by
1227 MAX_OFILE_ALIGNMENT. */
1230 default_vector_alignment (const_tree type
)
1232 unsigned HOST_WIDE_INT align
= MAX_OFILE_ALIGNMENT
;
1233 tree size
= TYPE_SIZE (type
);
1234 if (tree_fits_uhwi_p (size
))
1235 align
= tree_to_uhwi (size
);
1237 return align
< MAX_OFILE_ALIGNMENT
? align
: MAX_OFILE_ALIGNMENT
;
1240 /* The default implementation of
1241 TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT. */
1244 default_preferred_vector_alignment (const_tree type
)
1246 return TYPE_ALIGN (type
);
1249 /* By default assume vectors of element TYPE require a multiple of the natural
1250 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1252 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1257 /* By default, assume that a target supports any factor of misalignment
1258 memory access if it supports movmisalign patten.
1259 is_packed is true if the memory access is defined in a packed struct. */
1261 default_builtin_support_vector_misalignment (machine_mode mode
,
1269 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1274 /* By default, only attempt to parallelize bitwise operations, and
1275 possibly adds/subtracts using bit-twiddling. */
1278 default_preferred_simd_mode (scalar_mode
)
1283 /* By default do not split reductions further. */
1286 default_split_reduction (machine_mode mode
)
1291 /* By default only the preferred vector mode is tried. */
1294 default_autovectorize_vector_modes (vector_modes
*, bool)
1299 /* The default implementation of TARGET_VECTORIZE_RELATED_MODE. */
1302 default_vectorize_related_mode (machine_mode vector_mode
,
1303 scalar_mode element_mode
,
1306 machine_mode result_mode
;
1307 if ((maybe_ne (nunits
, 0U)
1308 || multiple_p (GET_MODE_SIZE (vector_mode
),
1309 GET_MODE_SIZE (element_mode
), &nunits
))
1310 && mode_for_vector (element_mode
, nunits
).exists (&result_mode
)
1311 && VECTOR_MODE_P (result_mode
)
1312 && targetm
.vector_mode_supported_p (result_mode
))
1315 return opt_machine_mode ();
1318 /* By default a vector of integers is used as a mask. */
1321 default_get_mask_mode (machine_mode mode
)
1323 return related_int_vector_mode (mode
);
1326 /* By default consider masked stores to be expensive. */
1329 default_empty_mask_is_expensive (unsigned ifn
)
1331 return ifn
== IFN_MASK_STORE
;
1334 /* By default, the cost model accumulates three separate costs (prologue,
1335 loop body, and epilogue) for a vectorized loop or block. So allocate an
1336 array of three unsigned ints, set it to zero, and return its address. */
1339 default_init_cost (class loop
*loop_info ATTRIBUTE_UNUSED
)
1341 unsigned *cost
= XNEWVEC (unsigned, 3);
1342 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1346 /* By default, the cost model looks up the cost of the given statement
1347 kind and mode, multiplies it by the occurrence count, accumulates
1348 it into the cost specified by WHERE, and returns the cost added. */
1351 default_add_stmt_cost (class vec_info
*vinfo
, void *data
, int count
,
1352 enum vect_cost_for_stmt kind
,
1353 class _stmt_vec_info
*stmt_info
, tree vectype
,
1355 enum vect_cost_model_location where
)
1357 unsigned *cost
= (unsigned *) data
;
1358 unsigned retval
= 0;
1359 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1361 /* Statements in an inner loop relative to the loop being
1362 vectorized are weighted more heavily. The value here is
1363 arbitrary and could potentially be improved with analysis. */
1364 if (where
== vect_body
&& stmt_info
1365 && stmt_in_inner_loop_p (vinfo
, stmt_info
))
1366 count
*= 50; /* FIXME. */
1368 retval
= (unsigned) (count
* stmt_cost
);
1369 cost
[where
] += retval
;
1374 /* By default, the cost model just returns the accumulated costs. */
1377 default_finish_cost (void *data
, unsigned *prologue_cost
,
1378 unsigned *body_cost
, unsigned *epilogue_cost
)
1380 unsigned *cost
= (unsigned *) data
;
1381 *prologue_cost
= cost
[vect_prologue
];
1382 *body_cost
= cost
[vect_body
];
1383 *epilogue_cost
= cost
[vect_epilogue
];
1386 /* Free the cost data. */
1389 default_destroy_cost_data (void *data
)
1394 /* Determine whether or not a pointer mode is valid. Assume defaults
1395 of ptr_mode or Pmode - can be overridden. */
1397 default_valid_pointer_mode (scalar_int_mode mode
)
1399 return (mode
== ptr_mode
|| mode
== Pmode
);
1402 /* Determine whether the memory reference specified by REF may alias
1403 the C libraries errno location. */
1405 default_ref_may_alias_errno (ao_ref
*ref
)
1407 tree base
= ao_ref_base (ref
);
1408 /* The default implementation assumes the errno location is
1409 a declaration of type int or is always accessed via a
1410 pointer to int. We assume that accesses to errno are
1411 not deliberately obfuscated (even in conforming ways). */
1412 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1413 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1415 /* The default implementation assumes an errno location declaration
1416 is never defined in the current compilation unit and may not be
1417 aliased by a local variable. */
1419 && DECL_EXTERNAL (base
)
1420 && !TREE_STATIC (base
))
1422 else if (TREE_CODE (base
) == MEM_REF
1423 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1425 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1426 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1431 /* Return the mode for a pointer to a given ADDRSPACE,
1432 defaulting to ptr_mode for all address spaces. */
1435 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1440 /* Return the mode for an address in a given ADDRSPACE,
1441 defaulting to Pmode for all address spaces. */
1444 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1449 /* Named address space version of valid_pointer_mode.
1450 To match the above, the same modes apply to all address spaces. */
1453 default_addr_space_valid_pointer_mode (scalar_int_mode mode
,
1454 addr_space_t as ATTRIBUTE_UNUSED
)
1456 return targetm
.valid_pointer_mode (mode
);
1459 /* Some places still assume that all pointer or address modes are the
1460 standard Pmode and ptr_mode. These optimizations become invalid if
1461 the target actually supports multiple different modes. For now,
1462 we disable such optimizations on such targets, using this function. */
1465 target_default_pointer_address_modes_p (void)
1467 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1469 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1475 /* Named address space version of legitimate_address_p.
1476 By default, all address spaces have the same form. */
1479 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1481 addr_space_t as ATTRIBUTE_UNUSED
)
1483 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1486 /* Named address space version of LEGITIMIZE_ADDRESS.
1487 By default, all address spaces have the same form. */
1490 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1491 addr_space_t as ATTRIBUTE_UNUSED
)
1493 return targetm
.legitimize_address (x
, oldx
, mode
);
1496 /* The default hook for determining if one named address space is a subset of
1497 another and to return which address space to use as the common address
1501 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1503 return (subset
== superset
);
1506 /* The default hook for determining if 0 within a named address
1507 space is a valid address. */
1510 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1515 /* The default hook for debugging the address space is to return the
1516 address space number to indicate DW_AT_address_class. */
1518 default_addr_space_debug (addr_space_t as
)
1523 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1524 Don't complain about any address space. */
1527 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1532 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1533 called for targets with only a generic address space. */
1536 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1537 tree from_type ATTRIBUTE_UNUSED
,
1538 tree to_type ATTRIBUTE_UNUSED
)
1543 /* The defualt implementation of TARGET_HARD_REGNO_NREGS. */
1546 default_hard_regno_nregs (unsigned int, machine_mode mode
)
1548 /* Targets with variable-sized modes must provide their own definition
1550 return CEIL (GET_MODE_SIZE (mode
).to_constant (), UNITS_PER_WORD
);
1554 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1559 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1562 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1563 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1568 extern bool default_new_address_profitable_p (rtx
, rtx
);
1571 /* The default implementation of TARGET_NEW_ADDRESS_PROFITABLE_P. */
1574 default_new_address_profitable_p (rtx memref ATTRIBUTE_UNUSED
,
1575 rtx_insn
*insn ATTRIBUTE_UNUSED
,
1576 rtx new_addr ATTRIBUTE_UNUSED
)
1582 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1583 tree
ARG_UNUSED (name
),
1584 tree
ARG_UNUSED (args
),
1585 int ARG_UNUSED (flags
))
1587 warning (OPT_Wattributes
,
1588 "target attribute is not supported on this machine");
1594 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1595 tree
ARG_UNUSED (pop_target
))
1597 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1598 emit no warning because "#pragma GCC pop_target" is valid on targets that
1599 do not have the "target" pragma. */
1601 warning (OPT_Wpragmas
,
1602 "%<#pragma GCC target%> is not supported for this machine");
1608 default_target_can_inline_p (tree caller
, tree callee
)
1610 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1611 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1613 callee_opts
= target_option_default_node
;
1615 caller_opts
= target_option_default_node
;
1617 /* If both caller and callee have attributes, assume that if the
1618 pointer is different, the two functions have different target
1619 options since build_target_option_node uses a hash table for the
1621 return callee_opts
== caller_opts
;
1624 /* If the machine does not have a case insn that compares the bounds,
1625 this means extra overhead for dispatch tables, which raises the
1626 threshold for using them. */
1629 default_case_values_threshold (void)
1631 return (targetm
.have_casesi () ? 4 : 5);
1635 default_have_conditional_execution (void)
1637 return HAVE_conditional_execution
;
1640 /* By default we assume that c99 functions are present at the runtime,
1641 but sincos is not. */
1643 default_libc_has_function (enum function_class fn_class
)
1645 if (fn_class
== function_c94
1646 || fn_class
== function_c99_misc
1647 || fn_class
== function_c99_math_complex
)
1653 /* By default assume that libc has not a fast implementation. */
1656 default_libc_has_fast_function (int fcode ATTRIBUTE_UNUSED
)
1662 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1668 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1674 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1679 /* Compute cost of moving registers to/from memory. */
1682 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1683 reg_class_t rclass ATTRIBUTE_UNUSED
,
1684 bool in ATTRIBUTE_UNUSED
)
1686 #ifndef MEMORY_MOVE_COST
1687 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1689 return MEMORY_MOVE_COST (MACRO_MODE (mode
), (enum reg_class
) rclass
, in
);
1693 /* Compute cost of moving data from a register of class FROM to one of
1697 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1698 reg_class_t from ATTRIBUTE_UNUSED
,
1699 reg_class_t to ATTRIBUTE_UNUSED
)
1701 #ifndef REGISTER_MOVE_COST
1704 return REGISTER_MOVE_COST (MACRO_MODE (mode
),
1705 (enum reg_class
) from
, (enum reg_class
) to
);
1709 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS. */
1712 default_slow_unaligned_access (machine_mode
, unsigned int)
1714 return STRICT_ALIGNMENT
;
1717 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE. */
1720 default_estimated_poly_value (poly_int64 x
)
1725 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1726 behavior. SPEED_P is true if we are compiling for speed. */
1729 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1731 unsigned int move_ratio
;
1733 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1735 #if defined (HAVE_cpymemqi) || defined (HAVE_cpymemhi) || defined (HAVE_cpymemsi) || defined (HAVE_cpymemdi) || defined (HAVE_cpymemti)
1737 #else /* No cpymem patterns, pick a default. */
1738 move_ratio
= ((speed_p
) ? 15 : 3);
1744 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1745 used; return FALSE if the cpymem/setmem optab should be expanded, or
1746 a call to memcpy emitted. */
1749 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1750 unsigned int alignment
,
1751 enum by_pieces_operation op
,
1754 unsigned int max_size
= 0;
1755 unsigned int ratio
= 0;
1759 case CLEAR_BY_PIECES
:
1760 max_size
= STORE_MAX_PIECES
;
1761 ratio
= CLEAR_RATIO (speed_p
);
1763 case MOVE_BY_PIECES
:
1764 max_size
= MOVE_MAX_PIECES
;
1765 ratio
= get_move_ratio (speed_p
);
1768 max_size
= STORE_MAX_PIECES
;
1769 ratio
= SET_RATIO (speed_p
);
1771 case STORE_BY_PIECES
:
1772 max_size
= STORE_MAX_PIECES
;
1773 ratio
= get_move_ratio (speed_p
);
1775 case COMPARE_BY_PIECES
:
1776 max_size
= COMPARE_MAX_PIECES
;
1777 /* Pick a likely default, just as in get_move_ratio. */
1778 ratio
= speed_p
? 15 : 3;
1782 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1785 /* This hook controls code generation for expanding a memcmp operation by
1786 pieces. Return 1 for the normal pattern of compare/jump after each pair
1787 of loads, or a higher number to reduce the number of branches. */
1790 default_compare_by_pieces_branch_ratio (machine_mode
)
1795 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1796 entry. If RECORD_P is true and the target supports named sections,
1797 the location of the NOPs will be recorded in a special object section
1798 called "__patchable_function_entries". This routine may be called
1799 twice per function to put NOPs before and after the function
1803 default_print_patchable_function_entry (FILE *file
,
1804 unsigned HOST_WIDE_INT patch_area_size
,
1807 const char *nop_templ
= 0;
1809 rtx_insn
*my_nop
= make_insn_raw (gen_nop ());
1811 /* We use the template alone, relying on the (currently sane) assumption
1812 that the NOP template does not have variable operands. */
1813 code_num
= recog_memoized (my_nop
);
1814 nop_templ
= get_insn_template (code_num
, my_nop
);
1816 if (record_p
&& targetm_common
.have_named_sections
)
1819 static int patch_area_number
;
1820 section
*previous_section
= in_section
;
1821 const char *asm_op
= integer_asm_op (POINTER_SIZE_UNITS
, false);
1823 gcc_assert (asm_op
!= NULL
);
1824 patch_area_number
++;
1825 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE", patch_area_number
);
1827 switch_to_section (get_section ("__patchable_function_entries",
1828 SECTION_WRITE
| SECTION_RELRO
, NULL
));
1829 assemble_align (POINTER_SIZE
);
1830 fputs (asm_op
, file
);
1831 assemble_name_raw (file
, buf
);
1834 switch_to_section (previous_section
);
1835 ASM_OUTPUT_LABEL (file
, buf
);
1839 for (i
= 0; i
< patch_area_size
; ++i
)
1840 output_asm_insn (nop_templ
, NULL
);
1844 default_profile_before_prologue (void)
1846 #ifdef PROFILE_BEFORE_PROLOGUE
1853 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1856 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1859 #ifdef PREFERRED_RELOAD_CLASS
1860 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1866 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1869 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1875 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1877 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1882 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1885 default_class_likely_spilled_p (reg_class_t rclass
)
1887 return (reg_class_size
[(int) rclass
] == 1);
1890 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1893 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1894 machine_mode mode ATTRIBUTE_UNUSED
)
1896 #ifdef CLASS_MAX_NREGS
1897 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
,
1900 /* Targets with variable-sized modes must provide their own definition
1902 unsigned int size
= GET_MODE_SIZE (mode
).to_constant ();
1903 return (size
+ UNITS_PER_WORD
- 1) / UNITS_PER_WORD
;
1907 /* Determine the debugging unwind mechanism for the target. */
1909 enum unwind_info_type
1910 default_debug_unwind_info (void)
1912 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1913 /* ??? Change all users to the hook, then poison this. */
1914 #ifdef DWARF2_FRAME_INFO
1915 if (DWARF2_FRAME_INFO
)
1919 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1920 #ifdef DWARF2_DEBUGGING_INFO
1921 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1928 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
1929 must define this hook. */
1932 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
1937 /* Determine the correct mode for a Dwarf frame register that represents
1941 default_dwarf_frame_reg_mode (int regno
)
1943 machine_mode save_mode
= reg_raw_mode
[regno
];
1945 if (targetm
.hard_regno_call_part_clobbered (eh_edge_abi
.id (),
1947 save_mode
= choose_hard_reg_mode (regno
, 1, &eh_edge_abi
);
1951 /* To be used by targets where reg_raw_mode doesn't return the right
1952 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1955 default_get_reg_raw_mode (int regno
)
1957 /* Targets must override this hook if the underlying register is
1959 return as_a
<fixed_size_mode
> (reg_raw_mode
[regno
]);
1962 /* Return true if a leaf function should stay leaf even with profiling
1966 default_keep_leaf_when_profiled ()
1971 /* Return true if the state of option OPTION should be stored in PCH files
1972 and checked by default_pch_valid_p. Store the option's current state
1976 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1978 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1980 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1982 if (option_flag_var (option
, &global_options
) == &target_flags
)
1983 if (targetm
.check_pch_target_flags
)
1985 return get_option_state (&global_options
, option
, state
);
1988 /* Default version of get_pch_validity.
1989 By default, every flag difference is fatal; that will be mostly right for
1990 most targets, but completely right for very few. */
1993 default_get_pch_validity (size_t *sz
)
1995 struct cl_option_state state
;
2000 if (targetm
.check_pch_target_flags
)
2001 *sz
+= sizeof (target_flags
);
2002 for (i
= 0; i
< cl_options_count
; i
++)
2003 if (option_affects_pch_p (i
, &state
))
2006 result
= r
= XNEWVEC (char, *sz
);
2010 if (targetm
.check_pch_target_flags
)
2012 memcpy (r
, &target_flags
, sizeof (target_flags
));
2013 r
+= sizeof (target_flags
);
2016 for (i
= 0; i
< cl_options_count
; i
++)
2017 if (option_affects_pch_p (i
, &state
))
2019 memcpy (r
, state
.data
, state
.size
);
2026 /* Return a message which says that a PCH file was created with a different
2027 setting of OPTION. */
2030 pch_option_mismatch (const char *option
)
2032 return xasprintf (_("created and used with differing settings of '%s'"),
2036 /* Default version of pch_valid_p. */
2039 default_pch_valid_p (const void *data_p
, size_t len
)
2041 struct cl_option_state state
;
2042 const char *data
= (const char *)data_p
;
2045 /* -fpic and -fpie also usually make a PCH invalid. */
2046 if (data
[0] != flag_pic
)
2047 return _("created and used with different settings of %<-fpic%>");
2048 if (data
[1] != flag_pie
)
2049 return _("created and used with different settings of %<-fpie%>");
2052 /* Check target_flags. */
2053 if (targetm
.check_pch_target_flags
)
2058 memcpy (&tf
, data
, sizeof (target_flags
));
2059 data
+= sizeof (target_flags
);
2060 len
-= sizeof (target_flags
);
2061 r
= targetm
.check_pch_target_flags (tf
);
2066 for (i
= 0; i
< cl_options_count
; i
++)
2067 if (option_affects_pch_p (i
, &state
))
2069 if (memcmp (data
, state
.data
, state
.size
) != 0)
2070 return pch_option_mismatch (cl_options
[i
].opt_text
);
2078 /* Default version of cstore_mode. */
2081 default_cstore_mode (enum insn_code icode
)
2083 return as_a
<scalar_int_mode
> (insn_data
[(int) icode
].operand
[0].mode
);
2086 /* Default version of member_type_forces_blk. */
2089 default_member_type_forces_blk (const_tree
, machine_mode
)
2095 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
2096 rtx ptr ATTRIBUTE_UNUSED
,
2097 rtx bnd ATTRIBUTE_UNUSED
)
2103 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
2104 rtx addr ATTRIBUTE_UNUSED
,
2105 rtx bounds ATTRIBUTE_UNUSED
,
2106 rtx to ATTRIBUTE_UNUSED
)
2112 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
2118 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
2119 rtx bounds ATTRIBUTE_UNUSED
)
2124 /* Default version of canonicalize_comparison. */
2127 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
2131 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
2134 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
2138 #ifndef PAD_VARARGS_DOWN
2139 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2142 /* Build an indirect-ref expression over the given TREE, which represents a
2143 piece of a va_arg() expansion. */
2145 build_va_arg_indirect_ref (tree addr
)
2147 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
2151 /* The "standard" implementation of va_arg: read the value from the
2152 current (padded) address and increment by the (padded) size. */
2155 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
2158 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
2159 unsigned HOST_WIDE_INT align
, boundary
;
2162 /* All of the alignment and movement below is for args-grow-up machines.
2163 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2164 implement their own specialized gimplify_va_arg_expr routines. */
2165 if (ARGS_GROW_DOWNWARD
)
2168 indirect
= pass_va_arg_by_reference (type
);
2170 type
= build_pointer_type (type
);
2172 if (targetm
.calls
.split_complex_arg
2173 && TREE_CODE (type
) == COMPLEX_TYPE
2174 && targetm
.calls
.split_complex_arg (type
))
2176 tree real_part
, imag_part
;
2178 real_part
= std_gimplify_va_arg_expr (valist
,
2179 TREE_TYPE (type
), pre_p
, NULL
);
2180 real_part
= get_initialized_tmp_var (real_part
, pre_p
);
2182 imag_part
= std_gimplify_va_arg_expr (unshare_expr (valist
),
2183 TREE_TYPE (type
), pre_p
, NULL
);
2184 imag_part
= get_initialized_tmp_var (imag_part
, pre_p
);
2186 return build2 (COMPLEX_EXPR
, type
, real_part
, imag_part
);
2189 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2190 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
2192 /* When we align parameter on stack for caller, if the parameter
2193 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2194 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
2195 here with caller. */
2196 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
2197 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
2199 boundary
/= BITS_PER_UNIT
;
2201 /* Hoist the valist value into a temporary for the moment. */
2202 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
);
2204 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
2205 requires greater alignment, we must perform dynamic alignment. */
2206 if (boundary
> align
2207 && !TYPE_EMPTY_P (type
)
2208 && !integer_zerop (TYPE_SIZE (type
)))
2210 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2211 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
2212 gimplify_and_add (t
, pre_p
);
2214 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2215 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
2217 build_int_cst (TREE_TYPE (valist
), -boundary
)));
2218 gimplify_and_add (t
, pre_p
);
2223 /* If the actual alignment is less than the alignment of the type,
2224 adjust the type accordingly so that we don't assume strict alignment
2225 when dereferencing the pointer. */
2226 boundary
*= BITS_PER_UNIT
;
2227 if (boundary
< TYPE_ALIGN (type
))
2229 type
= build_variant_type_copy (type
);
2230 SET_TYPE_ALIGN (type
, boundary
);
2233 /* Compute the rounded size of the type. */
2234 type_size
= arg_size_in_bytes (type
);
2235 rounded_size
= round_up (type_size
, align
);
2237 /* Reduce rounded_size so it's sharable with the postqueue. */
2238 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2242 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2244 /* Small args are padded downward. */
2245 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2246 rounded_size
, size_int (align
));
2247 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2248 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2249 addr
= fold_build_pointer_plus (addr
, t
);
2252 /* Compute new value for AP. */
2253 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2254 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2255 gimplify_and_add (t
, pre_p
);
2257 addr
= fold_convert (build_pointer_type (type
), addr
);
2260 addr
= build_va_arg_indirect_ref (addr
);
2262 return build_va_arg_indirect_ref (addr
);
2265 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2266 not support nested low-overhead loops. */
2269 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2270 unsigned int loop_depth
, bool)
2272 return loop_depth
== 1;
2275 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2278 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2283 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2286 default_max_noce_ifcvt_seq_cost (edge e
)
2288 bool predictable_p
= predictable_edge_p (e
);
2292 if (global_options_set
.x_param_max_rtl_if_conversion_predictable_cost
)
2293 return param_max_rtl_if_conversion_predictable_cost
;
2297 if (global_options_set
.x_param_max_rtl_if_conversion_unpredictable_cost
)
2298 return param_max_rtl_if_conversion_unpredictable_cost
;
2301 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2304 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2307 default_min_arithmetic_precision (void)
2309 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2312 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2314 enum flt_eval_method
2315 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2317 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2320 /* Default implementation for
2321 TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE. */
2323 default_stack_clash_protection_alloca_probe_range (void)
2328 /* The default implementation of TARGET_EARLY_REMAT_MODES. */
2331 default_select_early_remat_modes (sbitmap
)
2335 /* The default implementation of TARGET_PREFERRED_ELSE_VALUE. */
2338 default_preferred_else_value (unsigned, tree type
, unsigned, tree
*)
2340 return build_zero_cst (type
);
2343 /* Default implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE. */
2345 default_have_speculation_safe_value (bool active ATTRIBUTE_UNUSED
)
2347 #ifdef HAVE_speculation_barrier
2348 return active
? HAVE_speculation_barrier
: true;
2353 /* Alternative implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE
2354 that can be used on targets that never have speculative execution. */
2356 speculation_safe_value_not_needed (bool active
)
2361 /* Default implementation of the speculation-safe-load builtin. This
2362 implementation simply copies val to result and generates a
2363 speculation_barrier insn, if such a pattern is defined. */
2365 default_speculation_safe_value (machine_mode mode ATTRIBUTE_UNUSED
,
2366 rtx result
, rtx val
,
2367 rtx failval ATTRIBUTE_UNUSED
)
2369 emit_move_insn (result
, val
);
2371 #ifdef HAVE_speculation_barrier
2372 /* Assume the target knows what it is doing: if it defines a
2373 speculation barrier, but it is not enabled, then assume that one
2375 if (HAVE_speculation_barrier
)
2376 emit_insn (gen_speculation_barrier ());
2382 #include "gt-targhooks.h"