1 /* Default target hook functions.
2 Copyright (C) 2003-2019 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"
84 #include "langhooks.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 ca ATTRIBUTE_UNUSED
,
197 machine_mode mode ATTRIBUTE_UNUSED
,
198 tree type ATTRIBUTE_UNUSED
,
199 int *pretend_arg_size ATTRIBUTE_UNUSED
,
200 int second_time ATTRIBUTE_UNUSED
)
204 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
207 default_builtin_setjmp_frame_value (void)
209 return virtual_stack_vars_rtx
;
212 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
215 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
221 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
223 return (targetm
.calls
.setup_incoming_varargs
224 != default_setup_incoming_varargs
);
228 default_eh_return_filter_mode (void)
230 return targetm
.unwind_word_mode ();
234 default_libgcc_cmp_return_mode (void)
240 default_libgcc_shift_count_mode (void)
246 default_unwind_word_mode (void)
251 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
253 unsigned HOST_WIDE_INT
254 default_shift_truncation_mask (machine_mode mode
)
256 return SHIFT_COUNT_TRUNCATED
? GET_MODE_UNIT_BITSIZE (mode
) - 1 : 0;
259 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
262 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED
)
264 return have_insn_for (DIV
, mode
) ? 3 : 2;
267 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
270 default_mode_rep_extended (scalar_int_mode
, scalar_int_mode
)
275 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
278 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
283 /* Return machine mode for non-standard suffix
284 or VOIDmode if non-standard suffixes are unsupported. */
286 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
291 /* The generic C++ ABI specifies this is a 64-bit value. */
293 default_cxx_guard_type (void)
295 return long_long_integer_type_node
;
298 /* Returns the size of the cookie to use when allocating an array
299 whose elements have the indicated TYPE. Assumes that it is already
300 known that a cookie is needed. */
303 default_cxx_get_cookie_size (tree type
)
307 /* We need to allocate an additional max (sizeof (size_t), alignof
308 (true_type)) bytes. */
312 sizetype_size
= size_in_bytes (sizetype
);
313 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
314 if (tree_int_cst_lt (type_align
, sizetype_size
))
315 cookie_size
= sizetype_size
;
317 cookie_size
= type_align
;
322 /* Return true if a parameter must be passed by reference. This version
323 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
326 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t
,
327 const function_arg_info
&arg
)
329 return targetm
.calls
.must_pass_in_stack (arg
.mode
, arg
.type
);
332 /* Return true if a parameter follows callee copies conventions. This
333 version of the hook is true for all named arguments. */
336 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED
,
337 machine_mode mode ATTRIBUTE_UNUSED
,
338 const_tree type ATTRIBUTE_UNUSED
, bool named
)
343 /* Emit to STREAM the assembler syntax for insn operand X. */
346 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
347 int code ATTRIBUTE_UNUSED
)
350 PRINT_OPERAND (stream
, x
, code
);
356 /* Emit to STREAM the assembler syntax for an insn operand whose memory
360 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
361 machine_mode
/*mode*/,
362 rtx x ATTRIBUTE_UNUSED
)
364 #ifdef PRINT_OPERAND_ADDRESS
365 PRINT_OPERAND_ADDRESS (stream
, x
);
371 /* Return true if CODE is a valid punctuation character for the
372 `print_operand' hook. */
375 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
377 #ifdef PRINT_OPERAND_PUNCT_VALID_P
378 return PRINT_OPERAND_PUNCT_VALID_P (code
);
384 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
386 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
388 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
389 const char *stripped
= targetm
.strip_name_encoding (skipped
);
390 if (*name
!= '*' && user_label_prefix
[0])
391 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
392 return get_identifier (stripped
);
395 /* The default implementation of TARGET_TRANSLATE_MODE_ATTRIBUTE. */
398 default_translate_mode_attribute (machine_mode mode
)
403 /* True if MODE is valid for the target. By "valid", we mean able to
404 be manipulated in non-trivial ways. In particular, this means all
405 the arithmetic is supported.
407 By default we guess this means that any C type is supported. If
408 we can't map the mode back to a type that would be available in C,
409 then reject it. Special case, here, is the double-word arithmetic
410 supported by optabs.c. */
413 default_scalar_mode_supported_p (scalar_mode mode
)
415 int precision
= GET_MODE_PRECISION (mode
);
417 switch (GET_MODE_CLASS (mode
))
419 case MODE_PARTIAL_INT
:
421 if (precision
== CHAR_TYPE_SIZE
)
423 if (precision
== SHORT_TYPE_SIZE
)
425 if (precision
== INT_TYPE_SIZE
)
427 if (precision
== LONG_TYPE_SIZE
)
429 if (precision
== LONG_LONG_TYPE_SIZE
)
431 if (precision
== 2 * BITS_PER_WORD
)
436 if (precision
== FLOAT_TYPE_SIZE
)
438 if (precision
== DOUBLE_TYPE_SIZE
)
440 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
444 case MODE_DECIMAL_FLOAT
:
456 /* Return true if libgcc supports floating-point mode MODE (known to
457 be supported as a scalar mode). */
460 default_libgcc_floating_mode_supported_p (scalar_float_mode mode
)
483 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
484 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
486 opt_scalar_float_mode
487 default_floatn_mode (int n
, bool extended
)
491 opt_scalar_float_mode cand1
, cand2
;
492 scalar_float_mode mode
;
514 /* Those are the only valid _FloatNx types. */
517 if (cand1
.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
))
522 if (cand2
.exists (&mode
)
523 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
524 && targetm
.scalar_mode_supported_p (mode
)
525 && targetm
.libgcc_floating_mode_supported_p (mode
))
530 opt_scalar_float_mode cand
;
531 scalar_float_mode mode
;
535 /* Always enable _Float16 if we have basic support for the mode.
536 Targets can control the range and precision of operations on
537 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
564 if (cand
.exists (&mode
)
565 && REAL_MODE_FORMAT (mode
)->ieee_bits
== n
566 && targetm
.scalar_mode_supported_p (mode
)
567 && targetm
.libgcc_floating_mode_supported_p (mode
))
570 return opt_scalar_float_mode ();
573 /* Define this to return true if the _Floatn and _Floatnx built-in functions
574 should implicitly enable the built-in function without the __builtin_ prefix
575 in addition to the normal built-in function with the __builtin_ prefix. The
576 default is to only enable built-in functions without the __builtin_ prefix
577 for the GNU C langauge. The argument FUNC is the enum builtin_in_function
578 id of the function to be enabled. */
581 default_floatn_builtin_p (int func ATTRIBUTE_UNUSED
)
583 static bool first_time_p
= true;
584 static bool c_or_objective_c
;
588 first_time_p
= false;
589 c_or_objective_c
= lang_GNU_C () || lang_GNU_OBJC ();
592 return c_or_objective_c
;
595 /* Make some target macros useable by target-independent code. */
597 targhook_words_big_endian (void)
599 return !!WORDS_BIG_ENDIAN
;
603 targhook_float_words_big_endian (void)
605 return !!FLOAT_WORDS_BIG_ENDIAN
;
608 /* True if the target supports floating-point exceptions and rounding
612 default_float_exceptions_rounding_supported_p (void)
621 /* True if the target supports decimal floating point. */
624 default_decimal_float_supported_p (void)
626 return ENABLE_DECIMAL_FLOAT
;
629 /* True if the target supports fixed-point arithmetic. */
632 default_fixed_point_supported_p (void)
634 return ENABLE_FIXED_POINT
;
637 /* True if the target supports GNU indirect functions. */
640 default_has_ifunc_p (void)
642 return HAVE_GNU_INDIRECT_FUNCTION
;
645 /* Return true if we predict the loop LOOP will be transformed to a
646 low-overhead loop, otherwise return false.
648 By default, false is returned, as this hook's applicability should be
649 verified for each target. Target maintainers should re-define the hook
650 if the target can take advantage of it. */
653 default_predict_doloop_p (class loop
*loop ATTRIBUTE_UNUSED
)
658 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
661 This function checks whether a given INSN is valid within a low-overhead
662 loop. If INSN is invalid it returns the reason for that, otherwise it
663 returns NULL. A called function may clobber any special registers required
664 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
665 register for branch on table instructions. We reject the doloop pattern in
669 default_invalid_within_doloop (const rtx_insn
*insn
)
672 return "Function call in loop.";
674 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
675 return "Computed branch in the loop.";
680 /* Mapping of builtin functions to vectorized variants. */
683 default_builtin_vectorized_function (unsigned int, tree
, tree
)
688 /* Mapping of target builtin functions to vectorized variants. */
691 default_builtin_md_vectorized_function (tree
, tree
, tree
)
696 /* Vectorized conversion. */
699 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
700 tree dest_type ATTRIBUTE_UNUSED
,
701 tree src_type ATTRIBUTE_UNUSED
)
706 /* Default vectorizer cost model values. */
709 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
711 int misalign ATTRIBUTE_UNUSED
)
713 switch (type_of_cost
)
723 case cond_branch_not_taken
:
725 case vec_promote_demote
:
729 case unaligned_store
:
732 case cond_branch_taken
:
736 return estimated_poly_value (TYPE_VECTOR_SUBPARTS (vectype
)) - 1;
746 default_builtin_reciprocal (tree
)
752 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
753 cumulative_args_t ca ATTRIBUTE_UNUSED
,
754 machine_mode mode ATTRIBUTE_UNUSED
,
755 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
761 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
762 cumulative_args_t ca ATTRIBUTE_UNUSED
,
763 machine_mode mode ATTRIBUTE_UNUSED
,
764 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
770 hook_bool_CUMULATIVE_ARGS_arg_info_false (cumulative_args_t
,
771 const function_arg_info
&)
777 hook_int_CUMULATIVE_ARGS_arg_info_0 (cumulative_args_t
,
778 const function_arg_info
&)
784 hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED
,
785 tree ATTRIBUTE_UNUSED
)
790 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
791 machine_mode mode ATTRIBUTE_UNUSED
,
792 const_tree type ATTRIBUTE_UNUSED
,
793 bool named ATTRIBUTE_UNUSED
)
798 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET. */
801 default_function_arg_offset (machine_mode
, const_tree
)
806 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
807 upward, but pad short args downward on big-endian machines. */
810 default_function_arg_padding (machine_mode mode
, const_tree type
)
812 if (!BYTES_BIG_ENDIAN
)
815 unsigned HOST_WIDE_INT size
;
818 if (!type
|| TREE_CODE (TYPE_SIZE (type
)) != INTEGER_CST
)
820 size
= int_size_in_bytes (type
);
823 /* Targets with variable-sized modes must override this hook
824 and handle variable-sized modes explicitly. */
825 size
= GET_MODE_SIZE (mode
).to_constant ();
827 if (size
< (PARM_BOUNDARY
/ BITS_PER_UNIT
))
834 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
835 machine_mode mode ATTRIBUTE_UNUSED
,
836 const_tree type ATTRIBUTE_UNUSED
,
837 bool named ATTRIBUTE_UNUSED
)
843 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
844 machine_mode mode ATTRIBUTE_UNUSED
,
845 const_tree type ATTRIBUTE_UNUSED
,
846 bool named ATTRIBUTE_UNUSED
)
852 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
853 const_tree type ATTRIBUTE_UNUSED
)
855 return PARM_BOUNDARY
;
859 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
860 const_tree type ATTRIBUTE_UNUSED
)
862 return PARM_BOUNDARY
;
866 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
871 hook_invalid_arg_for_unprototyped_fn (
872 const_tree typelist ATTRIBUTE_UNUSED
,
873 const_tree funcdecl ATTRIBUTE_UNUSED
,
874 const_tree val ATTRIBUTE_UNUSED
)
879 /* Initialize the stack protection decls. */
881 /* Stack protection related decls living in libgcc. */
882 static GTY(()) tree stack_chk_guard_decl
;
885 default_stack_protect_guard (void)
887 tree t
= stack_chk_guard_decl
;
893 t
= build_decl (UNKNOWN_LOCATION
,
894 VAR_DECL
, get_identifier ("__stack_chk_guard"),
898 DECL_EXTERNAL (t
) = 1;
900 TREE_THIS_VOLATILE (t
) = 1;
901 DECL_ARTIFICIAL (t
) = 1;
902 DECL_IGNORED_P (t
) = 1;
904 /* Do not share RTL as the declaration is visible outside of
907 RTX_FLAG (x
, used
) = 1;
909 stack_chk_guard_decl
= t
;
915 static GTY(()) tree stack_chk_fail_decl
;
918 default_external_stack_protect_fail (void)
920 tree t
= stack_chk_fail_decl
;
924 t
= build_function_type_list (void_type_node
, NULL_TREE
);
925 t
= build_decl (UNKNOWN_LOCATION
,
926 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
929 DECL_EXTERNAL (t
) = 1;
931 TREE_THIS_VOLATILE (t
) = 1;
932 TREE_NOTHROW (t
) = 1;
933 DECL_ARTIFICIAL (t
) = 1;
934 DECL_IGNORED_P (t
) = 1;
935 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
936 DECL_VISIBILITY_SPECIFIED (t
) = 1;
938 stack_chk_fail_decl
= t
;
941 return build_call_expr (t
, 0);
945 default_hidden_stack_protect_fail (void)
947 #ifndef HAVE_GAS_HIDDEN
948 return default_external_stack_protect_fail ();
950 tree t
= stack_chk_fail_decl
;
953 return default_external_stack_protect_fail ();
957 t
= build_function_type_list (void_type_node
, NULL_TREE
);
958 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
959 get_identifier ("__stack_chk_fail_local"), t
);
962 DECL_EXTERNAL (t
) = 1;
964 TREE_THIS_VOLATILE (t
) = 1;
965 TREE_NOTHROW (t
) = 1;
966 DECL_ARTIFICIAL (t
) = 1;
967 DECL_IGNORED_P (t
) = 1;
968 DECL_VISIBILITY_SPECIFIED (t
) = 1;
969 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
971 stack_chk_fail_decl
= t
;
974 return build_call_expr (t
, 0);
979 hook_bool_const_rtx_commutative_p (const_rtx x
,
980 int outer_code ATTRIBUTE_UNUSED
)
982 return COMMUTATIVE_P (x
);
986 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
987 const_tree fn_decl_or_type
,
988 bool outgoing ATTRIBUTE_UNUSED
)
990 /* The old interface doesn't handle receiving the function type. */
992 && !DECL_P (fn_decl_or_type
))
993 fn_decl_or_type
= NULL
;
995 #ifdef FUNCTION_VALUE
996 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
1003 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
1004 const_rtx fun ATTRIBUTE_UNUSED
)
1006 #ifdef LIBCALL_VALUE
1007 return LIBCALL_VALUE (MACRO_MODE (mode
));
1013 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
1016 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
1018 #ifdef FUNCTION_VALUE_REGNO_P
1019 return FUNCTION_VALUE_REGNO_P (regno
);
1026 default_internal_arg_pointer (void)
1028 /* If the reg that the virtual arg pointer will be translated into is
1029 not a fixed reg or is the stack pointer, make a copy of the virtual
1030 arg pointer, and address parms via the copy. The frame pointer is
1031 considered fixed even though it is not marked as such. */
1032 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
1033 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
1034 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
1035 return copy_to_reg (virtual_incoming_args_rtx
);
1037 return virtual_incoming_args_rtx
;
1041 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
1045 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1046 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
1050 #ifdef STATIC_CHAIN_REGNUM
1051 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
1055 static bool issued_error
;
1058 issued_error
= true;
1059 sorry ("nested functions not supported on this target");
1062 /* It really doesn't matter what we return here, so long at it
1063 doesn't cause the rest of the compiler to crash. */
1064 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
1069 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
1070 rtx
ARG_UNUSED (r_chain
))
1072 sorry ("nested function trampolines not supported on this target");
1076 default_return_pops_args (tree
, tree
, poly_int64
)
1082 default_branch_target_register_class (void)
1088 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
1090 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1096 default_lra_p (void)
1102 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1108 default_register_usage_leveling_p (void)
1114 default_different_addr_displacement_p (void)
1120 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1121 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1122 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1123 secondary_reload_info
*sri
)
1125 enum reg_class rclass
= NO_REGS
;
1126 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1128 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1130 sri
->icode
= sri
->prev_sri
->t_icode
;
1133 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1135 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
,
1136 MACRO_MODE (reload_mode
), x
);
1138 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1140 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
,
1141 MACRO_MODE (reload_mode
), x
);
1143 if (rclass
!= NO_REGS
)
1145 enum insn_code icode
1146 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1149 if (icode
!= CODE_FOR_nothing
1150 && !insn_operand_matches (icode
, in_p
, x
))
1151 icode
= CODE_FOR_nothing
;
1152 else if (icode
!= CODE_FOR_nothing
)
1154 const char *insn_constraint
, *scratch_constraint
;
1155 enum reg_class insn_class
, scratch_class
;
1157 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1158 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1159 if (!*insn_constraint
)
1160 insn_class
= ALL_REGS
;
1165 gcc_assert (*insn_constraint
== '=');
1168 insn_class
= (reg_class_for_constraint
1169 (lookup_constraint (insn_constraint
)));
1170 gcc_assert (insn_class
!= NO_REGS
);
1173 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1174 /* The scratch register's constraint must start with "=&",
1175 except for an input reload, where only "=" is necessary,
1176 and where it might be beneficial to re-use registers from
1178 gcc_assert (scratch_constraint
[0] == '='
1179 && (in_p
|| scratch_constraint
[1] == '&'));
1180 scratch_constraint
++;
1181 if (*scratch_constraint
== '&')
1182 scratch_constraint
++;
1183 scratch_class
= (reg_class_for_constraint
1184 (lookup_constraint (scratch_constraint
)));
1186 if (reg_class_subset_p (reload_class
, insn_class
))
1188 gcc_assert (scratch_class
== rclass
);
1192 rclass
= insn_class
;
1195 if (rclass
== NO_REGS
)
1198 sri
->t_icode
= icode
;
1203 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE. */
1206 default_secondary_memory_needed_mode (machine_mode mode
)
1208 if (!targetm
.lra_p ()
1209 && known_lt (GET_MODE_BITSIZE (mode
), BITS_PER_WORD
)
1210 && INTEGRAL_MODE_P (mode
))
1211 return mode_for_size (BITS_PER_WORD
, GET_MODE_CLASS (mode
), 0).require ();
1215 /* By default, if flag_pic is true, then neither local nor global relocs
1216 should be placed in readonly memory. */
1219 default_reloc_rw_mask (void)
1221 return flag_pic
? 3 : 0;
1224 /* By default, address diff vectors are generated
1225 for jump tables when flag_pic is true. */
1228 default_generate_pic_addr_diff_vec (void)
1233 /* By default, do no modification. */
1234 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1240 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT. */
1243 default_static_rtx_alignment (machine_mode mode
)
1245 return GET_MODE_ALIGNMENT (mode
);
1248 /* The default implementation of TARGET_CONSTANT_ALIGNMENT. */
1251 default_constant_alignment (const_tree
, HOST_WIDE_INT align
)
1256 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1257 to at least BITS_PER_WORD but otherwise makes no changes. */
1260 constant_alignment_word_strings (const_tree exp
, HOST_WIDE_INT align
)
1262 if (TREE_CODE (exp
) == STRING_CST
)
1263 return MAX (align
, BITS_PER_WORD
);
1267 /* Default to natural alignment for vector types, bounded by
1268 MAX_OFILE_ALIGNMENT. */
1271 default_vector_alignment (const_tree type
)
1273 unsigned HOST_WIDE_INT align
= MAX_OFILE_ALIGNMENT
;
1274 tree size
= TYPE_SIZE (type
);
1275 if (tree_fits_uhwi_p (size
))
1276 align
= tree_to_uhwi (size
);
1278 return align
< MAX_OFILE_ALIGNMENT
? align
: MAX_OFILE_ALIGNMENT
;
1281 /* The default implementation of
1282 TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT. */
1285 default_preferred_vector_alignment (const_tree type
)
1287 return TYPE_ALIGN (type
);
1290 /* By default assume vectors of element TYPE require a multiple of the natural
1291 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1293 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1298 /* By default, assume that a target supports any factor of misalignment
1299 memory access if it supports movmisalign patten.
1300 is_packed is true if the memory access is defined in a packed struct. */
1302 default_builtin_support_vector_misalignment (machine_mode mode
,
1310 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1315 /* By default, only attempt to parallelize bitwise operations, and
1316 possibly adds/subtracts using bit-twiddling. */
1319 default_preferred_simd_mode (scalar_mode
)
1324 /* By default do not split reductions further. */
1327 default_split_reduction (machine_mode mode
)
1332 /* By default only the size derived from the preferred vector mode
1336 default_autovectorize_vector_sizes (vector_sizes
*, bool)
1340 /* By default a vector of integers is used as a mask. */
1343 default_get_mask_mode (poly_uint64 nunits
, poly_uint64 vector_size
)
1345 unsigned int elem_size
= vector_element_size (vector_size
, nunits
);
1346 scalar_int_mode elem_mode
1347 = smallest_int_mode_for_size (elem_size
* BITS_PER_UNIT
);
1348 machine_mode vector_mode
;
1350 gcc_assert (known_eq (elem_size
* nunits
, vector_size
));
1352 if (mode_for_vector (elem_mode
, nunits
).exists (&vector_mode
)
1353 && VECTOR_MODE_P (vector_mode
)
1354 && targetm
.vector_mode_supported_p (vector_mode
))
1357 return opt_machine_mode ();
1360 /* By default consider masked stores to be expensive. */
1363 default_empty_mask_is_expensive (unsigned ifn
)
1365 return ifn
== IFN_MASK_STORE
;
1368 /* By default, the cost model accumulates three separate costs (prologue,
1369 loop body, and epilogue) for a vectorized loop or block. So allocate an
1370 array of three unsigned ints, set it to zero, and return its address. */
1373 default_init_cost (class loop
*loop_info ATTRIBUTE_UNUSED
)
1375 unsigned *cost
= XNEWVEC (unsigned, 3);
1376 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1380 /* By default, the cost model looks up the cost of the given statement
1381 kind and mode, multiplies it by the occurrence count, accumulates
1382 it into the cost specified by WHERE, and returns the cost added. */
1385 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1386 class _stmt_vec_info
*stmt_info
, int misalign
,
1387 enum vect_cost_model_location where
)
1389 unsigned *cost
= (unsigned *) data
;
1390 unsigned retval
= 0;
1392 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1393 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1395 /* Statements in an inner loop relative to the loop being
1396 vectorized are weighted more heavily. The value here is
1397 arbitrary and could potentially be improved with analysis. */
1398 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1399 count
*= 50; /* FIXME. */
1401 retval
= (unsigned) (count
* stmt_cost
);
1402 cost
[where
] += retval
;
1407 /* By default, the cost model just returns the accumulated costs. */
1410 default_finish_cost (void *data
, unsigned *prologue_cost
,
1411 unsigned *body_cost
, unsigned *epilogue_cost
)
1413 unsigned *cost
= (unsigned *) data
;
1414 *prologue_cost
= cost
[vect_prologue
];
1415 *body_cost
= cost
[vect_body
];
1416 *epilogue_cost
= cost
[vect_epilogue
];
1419 /* Free the cost data. */
1422 default_destroy_cost_data (void *data
)
1427 /* Determine whether or not a pointer mode is valid. Assume defaults
1428 of ptr_mode or Pmode - can be overridden. */
1430 default_valid_pointer_mode (scalar_int_mode mode
)
1432 return (mode
== ptr_mode
|| mode
== Pmode
);
1435 /* Determine whether the memory reference specified by REF may alias
1436 the C libraries errno location. */
1438 default_ref_may_alias_errno (ao_ref
*ref
)
1440 tree base
= ao_ref_base (ref
);
1441 /* The default implementation assumes the errno location is
1442 a declaration of type int or is always accessed via a
1443 pointer to int. We assume that accesses to errno are
1444 not deliberately obfuscated (even in conforming ways). */
1445 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1446 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1448 /* The default implementation assumes an errno location
1449 declaration is never defined in the current compilation unit. */
1451 && !TREE_STATIC (base
))
1453 else if (TREE_CODE (base
) == MEM_REF
1454 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1456 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1457 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1462 /* Return the mode for a pointer to a given ADDRSPACE,
1463 defaulting to ptr_mode for all address spaces. */
1466 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1471 /* Return the mode for an address in a given ADDRSPACE,
1472 defaulting to Pmode for all address spaces. */
1475 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1480 /* Named address space version of valid_pointer_mode.
1481 To match the above, the same modes apply to all address spaces. */
1484 default_addr_space_valid_pointer_mode (scalar_int_mode mode
,
1485 addr_space_t as ATTRIBUTE_UNUSED
)
1487 return targetm
.valid_pointer_mode (mode
);
1490 /* Some places still assume that all pointer or address modes are the
1491 standard Pmode and ptr_mode. These optimizations become invalid if
1492 the target actually supports multiple different modes. For now,
1493 we disable such optimizations on such targets, using this function. */
1496 target_default_pointer_address_modes_p (void)
1498 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1500 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1506 /* Named address space version of legitimate_address_p.
1507 By default, all address spaces have the same form. */
1510 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1512 addr_space_t as ATTRIBUTE_UNUSED
)
1514 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1517 /* Named address space version of LEGITIMIZE_ADDRESS.
1518 By default, all address spaces have the same form. */
1521 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1522 addr_space_t as ATTRIBUTE_UNUSED
)
1524 return targetm
.legitimize_address (x
, oldx
, mode
);
1527 /* The default hook for determining if one named address space is a subset of
1528 another and to return which address space to use as the common address
1532 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1534 return (subset
== superset
);
1537 /* The default hook for determining if 0 within a named address
1538 space is a valid address. */
1541 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1546 /* The default hook for debugging the address space is to return the
1547 address space number to indicate DW_AT_address_class. */
1549 default_addr_space_debug (addr_space_t as
)
1554 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1555 Don't complain about any address space. */
1558 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1563 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1564 called for targets with only a generic address space. */
1567 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1568 tree from_type ATTRIBUTE_UNUSED
,
1569 tree to_type ATTRIBUTE_UNUSED
)
1574 /* The defualt implementation of TARGET_HARD_REGNO_NREGS. */
1577 default_hard_regno_nregs (unsigned int, machine_mode mode
)
1579 /* Targets with variable-sized modes must provide their own definition
1581 return CEIL (GET_MODE_SIZE (mode
).to_constant (), UNITS_PER_WORD
);
1585 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1590 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1593 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1594 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1600 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1601 tree
ARG_UNUSED (name
),
1602 tree
ARG_UNUSED (args
),
1603 int ARG_UNUSED (flags
))
1605 warning (OPT_Wattributes
,
1606 "target attribute is not supported on this machine");
1612 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1613 tree
ARG_UNUSED (pop_target
))
1615 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1616 emit no warning because "#pragma GCC pop_target" is valid on targets that
1617 do not have the "target" pragma. */
1619 warning (OPT_Wpragmas
,
1620 "%<#pragma GCC target%> is not supported for this machine");
1626 default_target_can_inline_p (tree caller
, tree callee
)
1628 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1629 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1631 callee_opts
= target_option_default_node
;
1633 caller_opts
= target_option_default_node
;
1635 /* If both caller and callee have attributes, assume that if the
1636 pointer is different, the two functions have different target
1637 options since build_target_option_node uses a hash table for the
1639 return callee_opts
== caller_opts
;
1642 /* If the machine does not have a case insn that compares the bounds,
1643 this means extra overhead for dispatch tables, which raises the
1644 threshold for using them. */
1647 default_case_values_threshold (void)
1649 return (targetm
.have_casesi () ? 4 : 5);
1653 default_have_conditional_execution (void)
1655 return HAVE_conditional_execution
;
1658 /* By default we assume that c99 functions are present at the runtime,
1659 but sincos is not. */
1661 default_libc_has_function (enum function_class fn_class
)
1663 if (fn_class
== function_c94
1664 || fn_class
== function_c99_misc
1665 || fn_class
== function_c99_math_complex
)
1671 /* By default assume that libc has not a fast implementation. */
1674 default_libc_has_fast_function (int fcode ATTRIBUTE_UNUSED
)
1680 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1686 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1692 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1697 /* Compute cost of moving registers to/from memory. */
1700 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1701 reg_class_t rclass ATTRIBUTE_UNUSED
,
1702 bool in ATTRIBUTE_UNUSED
)
1704 #ifndef MEMORY_MOVE_COST
1705 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1707 return MEMORY_MOVE_COST (MACRO_MODE (mode
), (enum reg_class
) rclass
, in
);
1711 /* Compute cost of moving data from a register of class FROM to one of
1715 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1716 reg_class_t from ATTRIBUTE_UNUSED
,
1717 reg_class_t to ATTRIBUTE_UNUSED
)
1719 #ifndef REGISTER_MOVE_COST
1722 return REGISTER_MOVE_COST (MACRO_MODE (mode
),
1723 (enum reg_class
) from
, (enum reg_class
) to
);
1727 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS. */
1730 default_slow_unaligned_access (machine_mode
, unsigned int)
1732 return STRICT_ALIGNMENT
;
1735 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE. */
1738 default_estimated_poly_value (poly_int64 x
)
1743 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1744 behavior. SPEED_P is true if we are compiling for speed. */
1747 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1749 unsigned int move_ratio
;
1751 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1753 #if defined (HAVE_cpymemqi) || defined (HAVE_cpymemhi) || defined (HAVE_cpymemsi) || defined (HAVE_cpymemdi) || defined (HAVE_cpymemti)
1755 #else /* No cpymem patterns, pick a default. */
1756 move_ratio
= ((speed_p
) ? 15 : 3);
1762 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1763 used; return FALSE if the cpymem/setmem optab should be expanded, or
1764 a call to memcpy emitted. */
1767 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1768 unsigned int alignment
,
1769 enum by_pieces_operation op
,
1772 unsigned int max_size
= 0;
1773 unsigned int ratio
= 0;
1777 case CLEAR_BY_PIECES
:
1778 max_size
= STORE_MAX_PIECES
;
1779 ratio
= CLEAR_RATIO (speed_p
);
1781 case MOVE_BY_PIECES
:
1782 max_size
= MOVE_MAX_PIECES
;
1783 ratio
= get_move_ratio (speed_p
);
1786 max_size
= STORE_MAX_PIECES
;
1787 ratio
= SET_RATIO (speed_p
);
1789 case STORE_BY_PIECES
:
1790 max_size
= STORE_MAX_PIECES
;
1791 ratio
= get_move_ratio (speed_p
);
1793 case COMPARE_BY_PIECES
:
1794 max_size
= COMPARE_MAX_PIECES
;
1795 /* Pick a likely default, just as in get_move_ratio. */
1796 ratio
= speed_p
? 15 : 3;
1800 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1803 /* This hook controls code generation for expanding a memcmp operation by
1804 pieces. Return 1 for the normal pattern of compare/jump after each pair
1805 of loads, or a higher number to reduce the number of branches. */
1808 default_compare_by_pieces_branch_ratio (machine_mode
)
1813 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1814 entry. If RECORD_P is true and the target supports named sections,
1815 the location of the NOPs will be recorded in a special object section
1816 called "__patchable_function_entries". This routine may be called
1817 twice per function to put NOPs before and after the function
1821 default_print_patchable_function_entry (FILE *file
,
1822 unsigned HOST_WIDE_INT patch_area_size
,
1825 const char *nop_templ
= 0;
1827 rtx_insn
*my_nop
= make_insn_raw (gen_nop ());
1829 /* We use the template alone, relying on the (currently sane) assumption
1830 that the NOP template does not have variable operands. */
1831 code_num
= recog_memoized (my_nop
);
1832 nop_templ
= get_insn_template (code_num
, my_nop
);
1834 if (record_p
&& targetm_common
.have_named_sections
)
1837 static int patch_area_number
;
1838 section
*previous_section
= in_section
;
1839 const char *asm_op
= integer_asm_op (POINTER_SIZE_UNITS
, false);
1841 gcc_assert (asm_op
!= NULL
);
1842 patch_area_number
++;
1843 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE", patch_area_number
);
1845 switch_to_section (get_section ("__patchable_function_entries",
1846 SECTION_WRITE
| SECTION_RELRO
, NULL
));
1847 fputs (asm_op
, file
);
1848 assemble_name_raw (file
, buf
);
1851 switch_to_section (previous_section
);
1852 ASM_OUTPUT_LABEL (file
, buf
);
1856 for (i
= 0; i
< patch_area_size
; ++i
)
1857 fprintf (file
, "\t%s\n", nop_templ
);
1861 default_profile_before_prologue (void)
1863 #ifdef PROFILE_BEFORE_PROLOGUE
1870 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1873 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1876 #ifdef PREFERRED_RELOAD_CLASS
1877 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1883 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1886 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1892 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1894 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1899 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1902 default_class_likely_spilled_p (reg_class_t rclass
)
1904 return (reg_class_size
[(int) rclass
] == 1);
1907 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1910 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1911 machine_mode mode ATTRIBUTE_UNUSED
)
1913 #ifdef CLASS_MAX_NREGS
1914 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
,
1917 /* Targets with variable-sized modes must provide their own definition
1919 unsigned int size
= GET_MODE_SIZE (mode
).to_constant ();
1920 return (size
+ UNITS_PER_WORD
- 1) / UNITS_PER_WORD
;
1924 /* Determine the debugging unwind mechanism for the target. */
1926 enum unwind_info_type
1927 default_debug_unwind_info (void)
1929 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1930 /* ??? Change all users to the hook, then poison this. */
1931 #ifdef DWARF2_FRAME_INFO
1932 if (DWARF2_FRAME_INFO
)
1936 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1937 #ifdef DWARF2_DEBUGGING_INFO
1938 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1945 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
1946 must define this hook. */
1949 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
1954 /* Determine the correct mode for a Dwarf frame register that represents
1958 default_dwarf_frame_reg_mode (int regno
)
1960 machine_mode save_mode
= reg_raw_mode
[regno
];
1962 if (targetm
.hard_regno_call_part_clobbered (NULL
, regno
, save_mode
))
1963 save_mode
= choose_hard_reg_mode (regno
, 1, true);
1967 /* To be used by targets where reg_raw_mode doesn't return the right
1968 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1971 default_get_reg_raw_mode (int regno
)
1973 /* Targets must override this hook if the underlying register is
1975 return as_a
<fixed_size_mode
> (reg_raw_mode
[regno
]);
1978 /* Return true if a leaf function should stay leaf even with profiling
1982 default_keep_leaf_when_profiled ()
1987 /* Return true if the state of option OPTION should be stored in PCH files
1988 and checked by default_pch_valid_p. Store the option's current state
1992 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1994 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1996 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1998 if (option_flag_var (option
, &global_options
) == &target_flags
)
1999 if (targetm
.check_pch_target_flags
)
2001 return get_option_state (&global_options
, option
, state
);
2004 /* Default version of get_pch_validity.
2005 By default, every flag difference is fatal; that will be mostly right for
2006 most targets, but completely right for very few. */
2009 default_get_pch_validity (size_t *sz
)
2011 struct cl_option_state state
;
2016 if (targetm
.check_pch_target_flags
)
2017 *sz
+= sizeof (target_flags
);
2018 for (i
= 0; i
< cl_options_count
; i
++)
2019 if (option_affects_pch_p (i
, &state
))
2022 result
= r
= XNEWVEC (char, *sz
);
2026 if (targetm
.check_pch_target_flags
)
2028 memcpy (r
, &target_flags
, sizeof (target_flags
));
2029 r
+= sizeof (target_flags
);
2032 for (i
= 0; i
< cl_options_count
; i
++)
2033 if (option_affects_pch_p (i
, &state
))
2035 memcpy (r
, state
.data
, state
.size
);
2042 /* Return a message which says that a PCH file was created with a different
2043 setting of OPTION. */
2046 pch_option_mismatch (const char *option
)
2048 return xasprintf (_("created and used with differing settings of '%s'"),
2052 /* Default version of pch_valid_p. */
2055 default_pch_valid_p (const void *data_p
, size_t len
)
2057 struct cl_option_state state
;
2058 const char *data
= (const char *)data_p
;
2061 /* -fpic and -fpie also usually make a PCH invalid. */
2062 if (data
[0] != flag_pic
)
2063 return _("created and used with different settings of %<-fpic%>");
2064 if (data
[1] != flag_pie
)
2065 return _("created and used with different settings of %<-fpie%>");
2068 /* Check target_flags. */
2069 if (targetm
.check_pch_target_flags
)
2074 memcpy (&tf
, data
, sizeof (target_flags
));
2075 data
+= sizeof (target_flags
);
2076 len
-= sizeof (target_flags
);
2077 r
= targetm
.check_pch_target_flags (tf
);
2082 for (i
= 0; i
< cl_options_count
; i
++)
2083 if (option_affects_pch_p (i
, &state
))
2085 if (memcmp (data
, state
.data
, state
.size
) != 0)
2086 return pch_option_mismatch (cl_options
[i
].opt_text
);
2094 /* Default version of cstore_mode. */
2097 default_cstore_mode (enum insn_code icode
)
2099 return as_a
<scalar_int_mode
> (insn_data
[(int) icode
].operand
[0].mode
);
2102 /* Default version of member_type_forces_blk. */
2105 default_member_type_forces_blk (const_tree
, machine_mode
)
2111 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
2112 rtx ptr ATTRIBUTE_UNUSED
,
2113 rtx bnd ATTRIBUTE_UNUSED
)
2119 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
2120 rtx addr ATTRIBUTE_UNUSED
,
2121 rtx bounds ATTRIBUTE_UNUSED
,
2122 rtx to ATTRIBUTE_UNUSED
)
2128 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
2134 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
2135 rtx bounds ATTRIBUTE_UNUSED
)
2140 /* Default version of canonicalize_comparison. */
2143 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
2147 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
2150 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
2154 #ifndef PAD_VARARGS_DOWN
2155 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2158 /* Build an indirect-ref expression over the given TREE, which represents a
2159 piece of a va_arg() expansion. */
2161 build_va_arg_indirect_ref (tree addr
)
2163 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
2167 /* The "standard" implementation of va_arg: read the value from the
2168 current (padded) address and increment by the (padded) size. */
2171 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
2174 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
2175 unsigned HOST_WIDE_INT align
, boundary
;
2178 /* All of the alignment and movement below is for args-grow-up machines.
2179 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2180 implement their own specialized gimplify_va_arg_expr routines. */
2181 if (ARGS_GROW_DOWNWARD
)
2184 indirect
= pass_va_arg_by_reference (type
);
2186 type
= build_pointer_type (type
);
2188 if (targetm
.calls
.split_complex_arg
2189 && TREE_CODE (type
) == COMPLEX_TYPE
2190 && targetm
.calls
.split_complex_arg (type
))
2192 tree real_part
, imag_part
;
2194 real_part
= std_gimplify_va_arg_expr (valist
,
2195 TREE_TYPE (type
), pre_p
, NULL
);
2196 real_part
= get_initialized_tmp_var (real_part
, pre_p
, NULL
);
2198 imag_part
= std_gimplify_va_arg_expr (unshare_expr (valist
),
2199 TREE_TYPE (type
), pre_p
, NULL
);
2200 imag_part
= get_initialized_tmp_var (imag_part
, pre_p
, NULL
);
2202 return build2 (COMPLEX_EXPR
, type
, real_part
, imag_part
);
2205 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2206 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
2208 /* When we align parameter on stack for caller, if the parameter
2209 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2210 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
2211 here with caller. */
2212 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
2213 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
2215 boundary
/= BITS_PER_UNIT
;
2217 /* Hoist the valist value into a temporary for the moment. */
2218 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
2220 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
2221 requires greater alignment, we must perform dynamic alignment. */
2222 if (boundary
> align
2223 && !TYPE_EMPTY_P (type
)
2224 && !integer_zerop (TYPE_SIZE (type
)))
2226 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2227 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
2228 gimplify_and_add (t
, pre_p
);
2230 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2231 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
2233 build_int_cst (TREE_TYPE (valist
), -boundary
)));
2234 gimplify_and_add (t
, pre_p
);
2239 /* If the actual alignment is less than the alignment of the type,
2240 adjust the type accordingly so that we don't assume strict alignment
2241 when dereferencing the pointer. */
2242 boundary
*= BITS_PER_UNIT
;
2243 if (boundary
< TYPE_ALIGN (type
))
2245 type
= build_variant_type_copy (type
);
2246 SET_TYPE_ALIGN (type
, boundary
);
2249 /* Compute the rounded size of the type. */
2250 type_size
= arg_size_in_bytes (type
);
2251 rounded_size
= round_up (type_size
, align
);
2253 /* Reduce rounded_size so it's sharable with the postqueue. */
2254 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2258 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2260 /* Small args are padded downward. */
2261 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2262 rounded_size
, size_int (align
));
2263 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2264 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2265 addr
= fold_build_pointer_plus (addr
, t
);
2268 /* Compute new value for AP. */
2269 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2270 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2271 gimplify_and_add (t
, pre_p
);
2273 addr
= fold_convert (build_pointer_type (type
), addr
);
2276 addr
= build_va_arg_indirect_ref (addr
);
2278 return build_va_arg_indirect_ref (addr
);
2281 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2282 not support nested low-overhead loops. */
2285 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2286 unsigned int loop_depth
, bool)
2288 return loop_depth
== 1;
2291 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2294 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2299 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2302 default_max_noce_ifcvt_seq_cost (edge e
)
2304 bool predictable_p
= predictable_edge_p (e
);
2306 enum compiler_param param
2308 ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2309 : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST
);
2311 /* If we have a parameter set, use that, otherwise take a guess using
2313 if (global_options_set
.x_param_values
[param
])
2314 return PARAM_VALUE (param
);
2316 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2319 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2322 default_min_arithmetic_precision (void)
2324 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2327 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2329 enum flt_eval_method
2330 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2332 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2335 /* Default implementation for
2336 TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE. */
2338 default_stack_clash_protection_alloca_probe_range (void)
2343 /* The default implementation of TARGET_EARLY_REMAT_MODES. */
2346 default_select_early_remat_modes (sbitmap
)
2350 /* The default implementation of TARGET_PREFERRED_ELSE_VALUE. */
2353 default_preferred_else_value (unsigned, tree type
, unsigned, tree
*)
2355 return build_zero_cst (type
);
2358 /* Default implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE. */
2360 default_have_speculation_safe_value (bool active ATTRIBUTE_UNUSED
)
2362 #ifdef HAVE_speculation_barrier
2363 return active
? HAVE_speculation_barrier
: true;
2368 /* Alternative implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE
2369 that can be used on targets that never have speculative execution. */
2371 speculation_safe_value_not_needed (bool active
)
2376 /* Default implementation of the speculation-safe-load builtin. This
2377 implementation simply copies val to result and generates a
2378 speculation_barrier insn, if such a pattern is defined. */
2380 default_speculation_safe_value (machine_mode mode ATTRIBUTE_UNUSED
,
2381 rtx result
, rtx val
,
2382 rtx failval ATTRIBUTE_UNUSED
)
2384 emit_move_insn (result
, val
);
2386 #ifdef HAVE_speculation_barrier
2387 /* Assume the target knows what it is doing: if it defines a
2388 speculation barrier, but it is not enabled, then assume that one
2390 if (HAVE_speculation_barrier
)
2391 emit_insn (gen_speculation_barrier ());
2398 default_remove_extra_call_preserved_regs (rtx_insn
*, HARD_REG_SET
*)
2402 #include "gt-targhooks.h"