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"
63 #include "stringpool.h"
65 #include "tree-ssanames.h"
66 #include "profile-count.h"
70 #include "diagnostic-core.h"
71 #include "fold-const.h"
72 #include "stor-layout.h"
79 #include "common/common-target.h"
86 #include "langhooks.h"
88 #include "function-abi.h"
91 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
92 rtx addr ATTRIBUTE_UNUSED
,
93 bool strict ATTRIBUTE_UNUSED
)
95 #ifdef GO_IF_LEGITIMATE_ADDRESS
96 /* Defer to the old implementation using a goto. */
98 return strict_memory_address_p (mode
, addr
);
100 return memory_address_p (mode
, addr
);
107 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
109 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
110 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
115 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
119 /* Any floating arithmetic may trap. */
120 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
123 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
125 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
133 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
135 int *punsignedp ATTRIBUTE_UNUSED
,
136 const_tree funtype ATTRIBUTE_UNUSED
,
137 int for_return ATTRIBUTE_UNUSED
)
139 if (type
!= NULL_TREE
&& for_return
== 2)
140 return promote_mode (type
, mode
, punsignedp
);
145 default_promote_function_mode_always_promote (const_tree type
,
148 const_tree funtype ATTRIBUTE_UNUSED
,
149 int for_return ATTRIBUTE_UNUSED
)
151 return promote_mode (type
, mode
, punsignedp
);
155 default_cc_modes_compatible (machine_mode m1
, machine_mode m2
)
163 default_return_in_memory (const_tree type
,
164 const_tree fntype ATTRIBUTE_UNUSED
)
166 return (TYPE_MODE (type
) == BLKmode
);
170 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
171 machine_mode mode ATTRIBUTE_UNUSED
)
177 default_legitimize_address_displacement (rtx
*, rtx
*, poly_int64
,
184 default_const_not_ok_for_debug_p (rtx x
)
186 if (GET_CODE (x
) == UNSPEC
)
192 default_expand_builtin_saveregs (void)
194 error ("%<__builtin_saveregs%> not supported by this target");
199 default_setup_incoming_varargs (cumulative_args_t
,
200 const function_arg_info
&, int *, int)
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
);
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
, const function_arg_info
&arg
)
341 /* Emit to STREAM the assembler syntax for insn operand X. */
344 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
345 int code ATTRIBUTE_UNUSED
)
348 PRINT_OPERAND (stream
, x
, code
);
354 /* Emit to STREAM the assembler syntax for an insn operand whose memory
358 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
359 machine_mode
/*mode*/,
360 rtx x ATTRIBUTE_UNUSED
)
362 #ifdef PRINT_OPERAND_ADDRESS
363 PRINT_OPERAND_ADDRESS (stream
, x
);
369 /* Return true if CODE is a valid punctuation character for the
370 `print_operand' hook. */
373 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
375 #ifdef PRINT_OPERAND_PUNCT_VALID_P
376 return PRINT_OPERAND_PUNCT_VALID_P (code
);
382 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
384 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
386 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
387 const char *stripped
= targetm
.strip_name_encoding (skipped
);
388 if (*name
!= '*' && user_label_prefix
[0])
389 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
390 return get_identifier (stripped
);
393 /* The default implementation of TARGET_TRANSLATE_MODE_ATTRIBUTE. */
396 default_translate_mode_attribute (machine_mode mode
)
401 /* True if MODE is valid for the target. By "valid", we mean able to
402 be manipulated in non-trivial ways. In particular, this means all
403 the arithmetic is supported.
405 By default we guess this means that any C type is supported. If
406 we can't map the mode back to a type that would be available in C,
407 then reject it. Special case, here, is the double-word arithmetic
408 supported by optabs.c. */
411 default_scalar_mode_supported_p (scalar_mode mode
)
413 int precision
= GET_MODE_PRECISION (mode
);
415 switch (GET_MODE_CLASS (mode
))
417 case MODE_PARTIAL_INT
:
419 if (precision
== CHAR_TYPE_SIZE
)
421 if (precision
== SHORT_TYPE_SIZE
)
423 if (precision
== INT_TYPE_SIZE
)
425 if (precision
== LONG_TYPE_SIZE
)
427 if (precision
== LONG_LONG_TYPE_SIZE
)
429 if (precision
== 2 * BITS_PER_WORD
)
434 if (precision
== FLOAT_TYPE_SIZE
)
436 if (precision
== DOUBLE_TYPE_SIZE
)
438 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
442 case MODE_DECIMAL_FLOAT
:
454 /* Return true if libgcc supports floating-point mode MODE (known to
455 be supported as a scalar mode). */
458 default_libgcc_floating_mode_supported_p (scalar_float_mode mode
)
481 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
482 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
484 opt_scalar_float_mode
485 default_floatn_mode (int n
, bool extended
)
489 opt_scalar_float_mode cand1
, cand2
;
490 scalar_float_mode mode
;
512 /* Those are the only valid _FloatNx types. */
515 if (cand1
.exists (&mode
)
516 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
517 && targetm
.scalar_mode_supported_p (mode
)
518 && targetm
.libgcc_floating_mode_supported_p (mode
))
520 if (cand2
.exists (&mode
)
521 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
522 && targetm
.scalar_mode_supported_p (mode
)
523 && targetm
.libgcc_floating_mode_supported_p (mode
))
528 opt_scalar_float_mode cand
;
529 scalar_float_mode mode
;
533 /* Always enable _Float16 if we have basic support for the mode.
534 Targets can control the range and precision of operations on
535 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
562 if (cand
.exists (&mode
)
563 && REAL_MODE_FORMAT (mode
)->ieee_bits
== n
564 && targetm
.scalar_mode_supported_p (mode
)
565 && targetm
.libgcc_floating_mode_supported_p (mode
))
568 return opt_scalar_float_mode ();
571 /* Define this to return true if the _Floatn and _Floatnx built-in functions
572 should implicitly enable the built-in function without the __builtin_ prefix
573 in addition to the normal built-in function with the __builtin_ prefix. The
574 default is to only enable built-in functions without the __builtin_ prefix
575 for the GNU C langauge. The argument FUNC is the enum builtin_in_function
576 id of the function to be enabled. */
579 default_floatn_builtin_p (int func ATTRIBUTE_UNUSED
)
581 static bool first_time_p
= true;
582 static bool c_or_objective_c
;
586 first_time_p
= false;
587 c_or_objective_c
= lang_GNU_C () || lang_GNU_OBJC ();
590 return c_or_objective_c
;
593 /* Make some target macros useable by target-independent code. */
595 targhook_words_big_endian (void)
597 return !!WORDS_BIG_ENDIAN
;
601 targhook_float_words_big_endian (void)
603 return !!FLOAT_WORDS_BIG_ENDIAN
;
606 /* True if the target supports floating-point exceptions and rounding
610 default_float_exceptions_rounding_supported_p (void)
619 /* True if the target supports decimal floating point. */
622 default_decimal_float_supported_p (void)
624 return ENABLE_DECIMAL_FLOAT
;
627 /* True if the target supports fixed-point arithmetic. */
630 default_fixed_point_supported_p (void)
632 return ENABLE_FIXED_POINT
;
635 /* True if the target supports GNU indirect functions. */
638 default_has_ifunc_p (void)
640 return HAVE_GNU_INDIRECT_FUNCTION
;
643 /* Return true if we predict the loop LOOP will be transformed to a
644 low-overhead loop, otherwise return false.
646 By default, false is returned, as this hook's applicability should be
647 verified for each target. Target maintainers should re-define the hook
648 if the target can take advantage of it. */
651 default_predict_doloop_p (class loop
*loop ATTRIBUTE_UNUSED
)
656 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
659 This function checks whether a given INSN is valid within a low-overhead
660 loop. If INSN is invalid it returns the reason for that, otherwise it
661 returns NULL. A called function may clobber any special registers required
662 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
663 register for branch on table instructions. We reject the doloop pattern in
667 default_invalid_within_doloop (const rtx_insn
*insn
)
670 return "Function call in loop.";
672 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
673 return "Computed branch in the loop.";
678 /* Mapping of builtin functions to vectorized variants. */
681 default_builtin_vectorized_function (unsigned int, tree
, tree
)
686 /* Mapping of target builtin functions to vectorized variants. */
689 default_builtin_md_vectorized_function (tree
, tree
, tree
)
694 /* Default vectorizer cost model values. */
697 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
699 int misalign ATTRIBUTE_UNUSED
)
701 switch (type_of_cost
)
711 case cond_branch_not_taken
:
713 case vec_promote_demote
:
717 case unaligned_store
:
720 case cond_branch_taken
:
724 return estimated_poly_value (TYPE_VECTOR_SUBPARTS (vectype
)) - 1;
734 default_builtin_reciprocal (tree
)
740 hook_bool_CUMULATIVE_ARGS_arg_info_false (cumulative_args_t
,
741 const function_arg_info
&)
747 hook_bool_CUMULATIVE_ARGS_arg_info_true (cumulative_args_t
,
748 const function_arg_info
&)
754 hook_int_CUMULATIVE_ARGS_arg_info_0 (cumulative_args_t
,
755 const function_arg_info
&)
761 hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED
,
762 tree ATTRIBUTE_UNUSED
)
767 default_function_arg_advance (cumulative_args_t
, const function_arg_info
&)
772 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET. */
775 default_function_arg_offset (machine_mode
, const_tree
)
780 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
781 upward, but pad short args downward on big-endian machines. */
784 default_function_arg_padding (machine_mode mode
, const_tree type
)
786 if (!BYTES_BIG_ENDIAN
)
789 unsigned HOST_WIDE_INT size
;
792 if (!type
|| TREE_CODE (TYPE_SIZE (type
)) != INTEGER_CST
)
794 size
= int_size_in_bytes (type
);
797 /* Targets with variable-sized modes must override this hook
798 and handle variable-sized modes explicitly. */
799 size
= GET_MODE_SIZE (mode
).to_constant ();
801 if (size
< (PARM_BOUNDARY
/ BITS_PER_UNIT
))
808 default_function_arg (cumulative_args_t
, const function_arg_info
&)
814 default_function_incoming_arg (cumulative_args_t
, const function_arg_info
&)
820 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
821 const_tree type ATTRIBUTE_UNUSED
)
823 return PARM_BOUNDARY
;
827 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
828 const_tree type ATTRIBUTE_UNUSED
)
830 return PARM_BOUNDARY
;
834 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
839 hook_invalid_arg_for_unprototyped_fn (
840 const_tree typelist ATTRIBUTE_UNUSED
,
841 const_tree funcdecl ATTRIBUTE_UNUSED
,
842 const_tree val ATTRIBUTE_UNUSED
)
847 /* Initialize the stack protection decls. */
849 /* Stack protection related decls living in libgcc. */
850 static GTY(()) tree stack_chk_guard_decl
;
853 default_stack_protect_guard (void)
855 tree t
= stack_chk_guard_decl
;
861 t
= build_decl (UNKNOWN_LOCATION
,
862 VAR_DECL
, get_identifier ("__stack_chk_guard"),
866 DECL_EXTERNAL (t
) = 1;
868 TREE_THIS_VOLATILE (t
) = 1;
869 DECL_ARTIFICIAL (t
) = 1;
870 DECL_IGNORED_P (t
) = 1;
872 /* Do not share RTL as the declaration is visible outside of
875 RTX_FLAG (x
, used
) = 1;
877 stack_chk_guard_decl
= t
;
883 static GTY(()) tree stack_chk_fail_decl
;
886 default_external_stack_protect_fail (void)
888 tree t
= stack_chk_fail_decl
;
892 t
= build_function_type_list (void_type_node
, NULL_TREE
);
893 t
= build_decl (UNKNOWN_LOCATION
,
894 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
897 DECL_EXTERNAL (t
) = 1;
899 TREE_THIS_VOLATILE (t
) = 1;
900 TREE_NOTHROW (t
) = 1;
901 DECL_ARTIFICIAL (t
) = 1;
902 DECL_IGNORED_P (t
) = 1;
903 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
904 DECL_VISIBILITY_SPECIFIED (t
) = 1;
906 stack_chk_fail_decl
= t
;
909 return build_call_expr (t
, 0);
913 default_hidden_stack_protect_fail (void)
915 #ifndef HAVE_GAS_HIDDEN
916 return default_external_stack_protect_fail ();
918 tree t
= stack_chk_fail_decl
;
921 return default_external_stack_protect_fail ();
925 t
= build_function_type_list (void_type_node
, NULL_TREE
);
926 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
927 get_identifier ("__stack_chk_fail_local"), t
);
930 DECL_EXTERNAL (t
) = 1;
932 TREE_THIS_VOLATILE (t
) = 1;
933 TREE_NOTHROW (t
) = 1;
934 DECL_ARTIFICIAL (t
) = 1;
935 DECL_IGNORED_P (t
) = 1;
936 DECL_VISIBILITY_SPECIFIED (t
) = 1;
937 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
939 stack_chk_fail_decl
= t
;
942 return build_call_expr (t
, 0);
947 hook_bool_const_rtx_commutative_p (const_rtx x
,
948 int outer_code ATTRIBUTE_UNUSED
)
950 return COMMUTATIVE_P (x
);
954 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
955 const_tree fn_decl_or_type
,
956 bool outgoing ATTRIBUTE_UNUSED
)
958 /* The old interface doesn't handle receiving the function type. */
960 && !DECL_P (fn_decl_or_type
))
961 fn_decl_or_type
= NULL
;
963 #ifdef FUNCTION_VALUE
964 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
971 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
972 const_rtx fun ATTRIBUTE_UNUSED
)
975 return LIBCALL_VALUE (MACRO_MODE (mode
));
981 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
984 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
986 #ifdef FUNCTION_VALUE_REGNO_P
987 return FUNCTION_VALUE_REGNO_P (regno
);
993 /* The default hook for TARGET_ZERO_CALL_USED_REGS. */
996 default_zero_call_used_regs (HARD_REG_SET need_zeroed_hardregs
)
998 gcc_assert (!hard_reg_set_empty_p (need_zeroed_hardregs
));
1000 for (unsigned int regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1001 if (TEST_HARD_REG_BIT (need_zeroed_hardregs
, regno
))
1003 rtx_insn
*last_insn
= get_last_insn ();
1004 machine_mode mode
= GET_MODE (regno_reg_rtx
[regno
]);
1005 rtx zero
= CONST0_RTX (mode
);
1006 rtx_insn
*insn
= emit_move_insn (regno_reg_rtx
[regno
], zero
);
1007 if (!valid_insn_p (insn
))
1009 static bool issued_error
;
1012 issued_error
= true;
1013 sorry ("%qs not supported on this target",
1014 "-fzero-call-used-regs");
1016 delete_insns_since (last_insn
);
1019 return need_zeroed_hardregs
;
1023 default_internal_arg_pointer (void)
1025 /* If the reg that the virtual arg pointer will be translated into is
1026 not a fixed reg or is the stack pointer, make a copy of the virtual
1027 arg pointer, and address parms via the copy. The frame pointer is
1028 considered fixed even though it is not marked as such. */
1029 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
1030 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
1031 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
1032 return copy_to_reg (virtual_incoming_args_rtx
);
1034 return virtual_incoming_args_rtx
;
1038 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
1042 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1043 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
1047 #ifdef STATIC_CHAIN_REGNUM
1048 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
1052 static bool issued_error
;
1055 issued_error
= true;
1056 sorry ("nested functions not supported on this target");
1059 /* It really doesn't matter what we return here, so long at it
1060 doesn't cause the rest of the compiler to crash. */
1061 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
1066 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
1067 rtx
ARG_UNUSED (r_chain
))
1069 sorry ("nested function trampolines not supported on this target");
1073 default_return_pops_args (tree
, tree
, poly_int64
)
1079 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
1081 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1087 default_lra_p (void)
1093 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1099 default_register_usage_leveling_p (void)
1105 default_different_addr_displacement_p (void)
1111 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1112 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1113 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1114 secondary_reload_info
*sri
)
1116 enum reg_class rclass
= NO_REGS
;
1117 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1119 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1121 sri
->icode
= sri
->prev_sri
->t_icode
;
1124 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1126 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
,
1127 MACRO_MODE (reload_mode
), x
);
1129 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1131 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
,
1132 MACRO_MODE (reload_mode
), x
);
1134 if (rclass
!= NO_REGS
)
1136 enum insn_code icode
1137 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1140 if (icode
!= CODE_FOR_nothing
1141 && !insn_operand_matches (icode
, in_p
, x
))
1142 icode
= CODE_FOR_nothing
;
1143 else if (icode
!= CODE_FOR_nothing
)
1145 const char *insn_constraint
, *scratch_constraint
;
1146 enum reg_class insn_class
, scratch_class
;
1148 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1149 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1150 if (!*insn_constraint
)
1151 insn_class
= ALL_REGS
;
1156 gcc_assert (*insn_constraint
== '=');
1159 insn_class
= (reg_class_for_constraint
1160 (lookup_constraint (insn_constraint
)));
1161 gcc_assert (insn_class
!= NO_REGS
);
1164 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1165 /* The scratch register's constraint must start with "=&",
1166 except for an input reload, where only "=" is necessary,
1167 and where it might be beneficial to re-use registers from
1169 gcc_assert (scratch_constraint
[0] == '='
1170 && (in_p
|| scratch_constraint
[1] == '&'));
1171 scratch_constraint
++;
1172 if (*scratch_constraint
== '&')
1173 scratch_constraint
++;
1174 scratch_class
= (reg_class_for_constraint
1175 (lookup_constraint (scratch_constraint
)));
1177 if (reg_class_subset_p (reload_class
, insn_class
))
1179 gcc_assert (scratch_class
== rclass
);
1183 rclass
= insn_class
;
1186 if (rclass
== NO_REGS
)
1189 sri
->t_icode
= icode
;
1194 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE. */
1197 default_secondary_memory_needed_mode (machine_mode mode
)
1199 if (!targetm
.lra_p ()
1200 && known_lt (GET_MODE_BITSIZE (mode
), BITS_PER_WORD
)
1201 && INTEGRAL_MODE_P (mode
))
1202 return mode_for_size (BITS_PER_WORD
, GET_MODE_CLASS (mode
), 0).require ();
1206 /* By default, if flag_pic is true, then neither local nor global relocs
1207 should be placed in readonly memory. */
1210 default_reloc_rw_mask (void)
1212 return flag_pic
? 3 : 0;
1215 /* By default, address diff vectors are generated
1216 for jump tables when flag_pic is true. */
1219 default_generate_pic_addr_diff_vec (void)
1224 /* By default, do no modification. */
1225 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1231 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT. */
1234 default_static_rtx_alignment (machine_mode mode
)
1236 return GET_MODE_ALIGNMENT (mode
);
1239 /* The default implementation of TARGET_CONSTANT_ALIGNMENT. */
1242 default_constant_alignment (const_tree
, HOST_WIDE_INT align
)
1247 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1248 to at least BITS_PER_WORD but otherwise makes no changes. */
1251 constant_alignment_word_strings (const_tree exp
, HOST_WIDE_INT align
)
1253 if (TREE_CODE (exp
) == STRING_CST
)
1254 return MAX (align
, BITS_PER_WORD
);
1258 /* Default to natural alignment for vector types, bounded by
1259 MAX_OFILE_ALIGNMENT. */
1262 default_vector_alignment (const_tree type
)
1264 unsigned HOST_WIDE_INT align
= MAX_OFILE_ALIGNMENT
;
1265 tree size
= TYPE_SIZE (type
);
1266 if (tree_fits_uhwi_p (size
))
1267 align
= tree_to_uhwi (size
);
1268 if (align
>= MAX_OFILE_ALIGNMENT
)
1269 return MAX_OFILE_ALIGNMENT
;
1270 return MAX (align
, GET_MODE_ALIGNMENT (TYPE_MODE (type
)));
1273 /* The default implementation of
1274 TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT. */
1277 default_preferred_vector_alignment (const_tree type
)
1279 return TYPE_ALIGN (type
);
1282 /* By default assume vectors of element TYPE require a multiple of the natural
1283 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1285 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1290 /* By default, assume that a target supports any factor of misalignment
1291 memory access if it supports movmisalign patten.
1292 is_packed is true if the memory access is defined in a packed struct. */
1294 default_builtin_support_vector_misalignment (machine_mode mode
,
1302 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1307 /* By default, only attempt to parallelize bitwise operations, and
1308 possibly adds/subtracts using bit-twiddling. */
1311 default_preferred_simd_mode (scalar_mode
)
1316 /* By default do not split reductions further. */
1319 default_split_reduction (machine_mode mode
)
1324 /* By default only the preferred vector mode is tried. */
1327 default_autovectorize_vector_modes (vector_modes
*, bool)
1332 /* The default implementation of TARGET_VECTORIZE_RELATED_MODE. */
1335 default_vectorize_related_mode (machine_mode vector_mode
,
1336 scalar_mode element_mode
,
1339 machine_mode result_mode
;
1340 if ((maybe_ne (nunits
, 0U)
1341 || multiple_p (GET_MODE_SIZE (vector_mode
),
1342 GET_MODE_SIZE (element_mode
), &nunits
))
1343 && mode_for_vector (element_mode
, nunits
).exists (&result_mode
)
1344 && VECTOR_MODE_P (result_mode
)
1345 && targetm
.vector_mode_supported_p (result_mode
))
1348 return opt_machine_mode ();
1351 /* By default a vector of integers is used as a mask. */
1354 default_get_mask_mode (machine_mode mode
)
1356 return related_int_vector_mode (mode
);
1359 /* By default consider masked stores to be expensive. */
1362 default_empty_mask_is_expensive (unsigned ifn
)
1364 return ifn
== IFN_MASK_STORE
;
1367 /* By default, the cost model accumulates three separate costs (prologue,
1368 loop body, and epilogue) for a vectorized loop or block. So allocate an
1369 array of three unsigned ints, set it to zero, and return its address. */
1372 default_init_cost (class loop
*loop_info ATTRIBUTE_UNUSED
)
1374 unsigned *cost
= XNEWVEC (unsigned, 3);
1375 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1379 /* By default, the cost model looks up the cost of the given statement
1380 kind and mode, multiplies it by the occurrence count, accumulates
1381 it into the cost specified by WHERE, and returns the cost added. */
1384 default_add_stmt_cost (class vec_info
*vinfo
, void *data
, int count
,
1385 enum vect_cost_for_stmt kind
,
1386 class _stmt_vec_info
*stmt_info
, tree vectype
,
1388 enum vect_cost_model_location where
)
1390 unsigned *cost
= (unsigned *) data
;
1391 unsigned retval
= 0;
1392 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1394 /* Statements in an inner loop relative to the loop being
1395 vectorized are weighted more heavily. The value here is
1396 arbitrary and could potentially be improved with analysis. */
1397 if (where
== vect_body
&& stmt_info
1398 && stmt_in_inner_loop_p (vinfo
, 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 declaration
1449 is never defined in the current compilation unit and may not be
1450 aliased by a local variable. */
1452 && DECL_EXTERNAL (base
)
1453 && !TREE_STATIC (base
))
1455 else if (TREE_CODE (base
) == MEM_REF
1456 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1458 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1459 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1464 /* Return the mode for a pointer to a given ADDRSPACE,
1465 defaulting to ptr_mode for all address spaces. */
1468 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1473 /* Return the mode for an address in a given ADDRSPACE,
1474 defaulting to Pmode for all address spaces. */
1477 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1482 /* Named address space version of valid_pointer_mode.
1483 To match the above, the same modes apply to all address spaces. */
1486 default_addr_space_valid_pointer_mode (scalar_int_mode mode
,
1487 addr_space_t as ATTRIBUTE_UNUSED
)
1489 return targetm
.valid_pointer_mode (mode
);
1492 /* Some places still assume that all pointer or address modes are the
1493 standard Pmode and ptr_mode. These optimizations become invalid if
1494 the target actually supports multiple different modes. For now,
1495 we disable such optimizations on such targets, using this function. */
1498 target_default_pointer_address_modes_p (void)
1500 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1502 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1508 /* Named address space version of legitimate_address_p.
1509 By default, all address spaces have the same form. */
1512 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1514 addr_space_t as ATTRIBUTE_UNUSED
)
1516 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1519 /* Named address space version of LEGITIMIZE_ADDRESS.
1520 By default, all address spaces have the same form. */
1523 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1524 addr_space_t as ATTRIBUTE_UNUSED
)
1526 return targetm
.legitimize_address (x
, oldx
, mode
);
1529 /* The default hook for determining if one named address space is a subset of
1530 another and to return which address space to use as the common address
1534 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1536 return (subset
== superset
);
1539 /* The default hook for determining if 0 within a named address
1540 space is a valid address. */
1543 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1548 /* The default hook for debugging the address space is to return the
1549 address space number to indicate DW_AT_address_class. */
1551 default_addr_space_debug (addr_space_t as
)
1556 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1557 Don't complain about any address space. */
1560 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1565 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1566 called for targets with only a generic address space. */
1569 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1570 tree from_type ATTRIBUTE_UNUSED
,
1571 tree to_type ATTRIBUTE_UNUSED
)
1576 /* The defualt implementation of TARGET_HARD_REGNO_NREGS. */
1579 default_hard_regno_nregs (unsigned int, machine_mode mode
)
1581 /* Targets with variable-sized modes must provide their own definition
1583 return CEIL (GET_MODE_SIZE (mode
).to_constant (), UNITS_PER_WORD
);
1587 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1592 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1595 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1596 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1601 extern bool default_new_address_profitable_p (rtx
, rtx
);
1604 /* The default implementation of TARGET_NEW_ADDRESS_PROFITABLE_P. */
1607 default_new_address_profitable_p (rtx memref ATTRIBUTE_UNUSED
,
1608 rtx_insn
*insn ATTRIBUTE_UNUSED
,
1609 rtx new_addr ATTRIBUTE_UNUSED
)
1615 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1616 tree
ARG_UNUSED (name
),
1617 tree
ARG_UNUSED (args
),
1618 int ARG_UNUSED (flags
))
1620 warning (OPT_Wattributes
,
1621 "target attribute is not supported on this machine");
1627 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1628 tree
ARG_UNUSED (pop_target
))
1630 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1631 emit no warning because "#pragma GCC pop_target" is valid on targets that
1632 do not have the "target" pragma. */
1634 warning (OPT_Wpragmas
,
1635 "%<#pragma GCC target%> is not supported for this machine");
1641 default_target_can_inline_p (tree caller
, tree callee
)
1643 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1644 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1646 callee_opts
= target_option_default_node
;
1648 caller_opts
= target_option_default_node
;
1650 /* If both caller and callee have attributes, assume that if the
1651 pointer is different, the two functions have different target
1652 options since build_target_option_node uses a hash table for the
1654 return callee_opts
== caller_opts
;
1657 /* If the machine does not have a case insn that compares the bounds,
1658 this means extra overhead for dispatch tables, which raises the
1659 threshold for using them. */
1662 default_case_values_threshold (void)
1664 return (targetm
.have_casesi () ? 4 : 5);
1668 default_have_conditional_execution (void)
1670 return HAVE_conditional_execution
;
1673 /* By default we assume that c99 functions are present at the runtime,
1674 but sincos is not. */
1676 default_libc_has_function (enum function_class fn_class
,
1677 tree type ATTRIBUTE_UNUSED
)
1679 if (fn_class
== function_c94
1680 || fn_class
== function_c99_misc
1681 || fn_class
== function_c99_math_complex
)
1687 /* By default assume that libc has not a fast implementation. */
1690 default_libc_has_fast_function (int fcode ATTRIBUTE_UNUSED
)
1696 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
,
1697 tree type ATTRIBUTE_UNUSED
)
1703 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
,
1704 tree type ATTRIBUTE_UNUSED
)
1710 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1715 /* Compute cost of moving registers to/from memory. */
1718 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1719 reg_class_t rclass ATTRIBUTE_UNUSED
,
1720 bool in ATTRIBUTE_UNUSED
)
1722 #ifndef MEMORY_MOVE_COST
1723 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1725 return MEMORY_MOVE_COST (MACRO_MODE (mode
), (enum reg_class
) rclass
, in
);
1729 /* Compute cost of moving data from a register of class FROM to one of
1733 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1734 reg_class_t from ATTRIBUTE_UNUSED
,
1735 reg_class_t to ATTRIBUTE_UNUSED
)
1737 #ifndef REGISTER_MOVE_COST
1740 return REGISTER_MOVE_COST (MACRO_MODE (mode
),
1741 (enum reg_class
) from
, (enum reg_class
) to
);
1745 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS. */
1748 default_slow_unaligned_access (machine_mode
, unsigned int)
1750 return STRICT_ALIGNMENT
;
1753 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE. */
1756 default_estimated_poly_value (poly_int64 x
)
1761 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1762 behavior. SPEED_P is true if we are compiling for speed. */
1765 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1767 unsigned int move_ratio
;
1769 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1771 #if defined (HAVE_cpymemqi) || defined (HAVE_cpymemhi) || defined (HAVE_cpymemsi) || defined (HAVE_cpymemdi) || defined (HAVE_cpymemti)
1773 #else /* No cpymem patterns, pick a default. */
1774 move_ratio
= ((speed_p
) ? 15 : 3);
1780 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1781 used; return FALSE if the cpymem/setmem optab should be expanded, or
1782 a call to memcpy emitted. */
1785 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1786 unsigned int alignment
,
1787 enum by_pieces_operation op
,
1790 unsigned int max_size
= 0;
1791 unsigned int ratio
= 0;
1795 case CLEAR_BY_PIECES
:
1796 max_size
= STORE_MAX_PIECES
;
1797 ratio
= CLEAR_RATIO (speed_p
);
1799 case MOVE_BY_PIECES
:
1800 max_size
= MOVE_MAX_PIECES
;
1801 ratio
= get_move_ratio (speed_p
);
1804 max_size
= STORE_MAX_PIECES
;
1805 ratio
= SET_RATIO (speed_p
);
1807 case STORE_BY_PIECES
:
1808 max_size
= STORE_MAX_PIECES
;
1809 ratio
= get_move_ratio (speed_p
);
1811 case COMPARE_BY_PIECES
:
1812 max_size
= COMPARE_MAX_PIECES
;
1813 /* Pick a likely default, just as in get_move_ratio. */
1814 ratio
= speed_p
? 15 : 3;
1818 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1821 /* This hook controls code generation for expanding a memcmp operation by
1822 pieces. Return 1 for the normal pattern of compare/jump after each pair
1823 of loads, or a higher number to reduce the number of branches. */
1826 default_compare_by_pieces_branch_ratio (machine_mode
)
1831 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1832 entry. If RECORD_P is true and the target supports named sections,
1833 the location of the NOPs will be recorded in a special object section
1834 called "__patchable_function_entries". This routine may be called
1835 twice per function to put NOPs before and after the function
1839 default_print_patchable_function_entry (FILE *file
,
1840 unsigned HOST_WIDE_INT patch_area_size
,
1843 const char *nop_templ
= 0;
1845 rtx_insn
*my_nop
= make_insn_raw (gen_nop ());
1847 /* We use the template alone, relying on the (currently sane) assumption
1848 that the NOP template does not have variable operands. */
1849 code_num
= recog_memoized (my_nop
);
1850 nop_templ
= get_insn_template (code_num
, my_nop
);
1852 if (record_p
&& targetm_common
.have_named_sections
)
1855 static int patch_area_number
;
1856 section
*previous_section
= in_section
;
1857 const char *asm_op
= integer_asm_op (POINTER_SIZE_UNITS
, false);
1859 gcc_assert (asm_op
!= NULL
);
1860 patch_area_number
++;
1861 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE", patch_area_number
);
1863 switch_to_section (get_section ("__patchable_function_entries",
1864 SECTION_WRITE
| SECTION_RELRO
, NULL
));
1865 assemble_align (POINTER_SIZE
);
1866 fputs (asm_op
, file
);
1867 assemble_name_raw (file
, buf
);
1870 switch_to_section (previous_section
);
1871 ASM_OUTPUT_LABEL (file
, buf
);
1875 for (i
= 0; i
< patch_area_size
; ++i
)
1876 output_asm_insn (nop_templ
, NULL
);
1880 default_profile_before_prologue (void)
1882 #ifdef PROFILE_BEFORE_PROLOGUE
1889 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1892 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1895 #ifdef PREFERRED_RELOAD_CLASS
1896 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1902 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1905 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1911 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1913 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1918 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1921 default_class_likely_spilled_p (reg_class_t rclass
)
1923 return (reg_class_size
[(int) rclass
] == 1);
1926 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1929 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1930 machine_mode mode ATTRIBUTE_UNUSED
)
1932 #ifdef CLASS_MAX_NREGS
1933 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
,
1936 /* Targets with variable-sized modes must provide their own definition
1938 unsigned int size
= GET_MODE_SIZE (mode
).to_constant ();
1939 return (size
+ UNITS_PER_WORD
- 1) / UNITS_PER_WORD
;
1943 /* Determine the debugging unwind mechanism for the target. */
1945 enum unwind_info_type
1946 default_debug_unwind_info (void)
1948 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1949 /* ??? Change all users to the hook, then poison this. */
1950 #ifdef DWARF2_FRAME_INFO
1951 if (DWARF2_FRAME_INFO
)
1955 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1956 #ifdef DWARF2_DEBUGGING_INFO
1957 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1964 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
1965 must define this hook. */
1968 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
1973 /* Determine the correct mode for a Dwarf frame register that represents
1977 default_dwarf_frame_reg_mode (int regno
)
1979 machine_mode save_mode
= reg_raw_mode
[regno
];
1981 if (targetm
.hard_regno_call_part_clobbered (eh_edge_abi
.id (),
1983 save_mode
= choose_hard_reg_mode (regno
, 1, &eh_edge_abi
);
1987 /* To be used by targets where reg_raw_mode doesn't return the right
1988 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1991 default_get_reg_raw_mode (int regno
)
1993 /* Targets must override this hook if the underlying register is
1995 return as_a
<fixed_size_mode
> (reg_raw_mode
[regno
]);
1998 /* Return true if a leaf function should stay leaf even with profiling
2002 default_keep_leaf_when_profiled ()
2007 /* Return true if the state of option OPTION should be stored in PCH files
2008 and checked by default_pch_valid_p. Store the option's current state
2012 option_affects_pch_p (int option
, struct cl_option_state
*state
)
2014 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
2016 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
2018 if (option_flag_var (option
, &global_options
) == &target_flags
)
2019 if (targetm
.check_pch_target_flags
)
2021 return get_option_state (&global_options
, option
, state
);
2024 /* Default version of get_pch_validity.
2025 By default, every flag difference is fatal; that will be mostly right for
2026 most targets, but completely right for very few. */
2029 default_get_pch_validity (size_t *sz
)
2031 struct cl_option_state state
;
2036 if (targetm
.check_pch_target_flags
)
2037 *sz
+= sizeof (target_flags
);
2038 for (i
= 0; i
< cl_options_count
; i
++)
2039 if (option_affects_pch_p (i
, &state
))
2042 result
= r
= XNEWVEC (char, *sz
);
2046 if (targetm
.check_pch_target_flags
)
2048 memcpy (r
, &target_flags
, sizeof (target_flags
));
2049 r
+= sizeof (target_flags
);
2052 for (i
= 0; i
< cl_options_count
; i
++)
2053 if (option_affects_pch_p (i
, &state
))
2055 memcpy (r
, state
.data
, state
.size
);
2062 /* Return a message which says that a PCH file was created with a different
2063 setting of OPTION. */
2066 pch_option_mismatch (const char *option
)
2068 return xasprintf (_("created and used with differing settings of '%s'"),
2072 /* Default version of pch_valid_p. */
2075 default_pch_valid_p (const void *data_p
, size_t len
)
2077 struct cl_option_state state
;
2078 const char *data
= (const char *)data_p
;
2081 /* -fpic and -fpie also usually make a PCH invalid. */
2082 if (data
[0] != flag_pic
)
2083 return _("created and used with different settings of %<-fpic%>");
2084 if (data
[1] != flag_pie
)
2085 return _("created and used with different settings of %<-fpie%>");
2088 /* Check target_flags. */
2089 if (targetm
.check_pch_target_flags
)
2094 memcpy (&tf
, data
, sizeof (target_flags
));
2095 data
+= sizeof (target_flags
);
2096 len
-= sizeof (target_flags
);
2097 r
= targetm
.check_pch_target_flags (tf
);
2102 for (i
= 0; i
< cl_options_count
; i
++)
2103 if (option_affects_pch_p (i
, &state
))
2105 if (memcmp (data
, state
.data
, state
.size
) != 0)
2106 return pch_option_mismatch (cl_options
[i
].opt_text
);
2114 /* Default version of cstore_mode. */
2117 default_cstore_mode (enum insn_code icode
)
2119 return as_a
<scalar_int_mode
> (insn_data
[(int) icode
].operand
[0].mode
);
2122 /* Default version of member_type_forces_blk. */
2125 default_member_type_forces_blk (const_tree
, machine_mode
)
2131 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
2132 rtx ptr ATTRIBUTE_UNUSED
,
2133 rtx bnd ATTRIBUTE_UNUSED
)
2139 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
2140 rtx addr ATTRIBUTE_UNUSED
,
2141 rtx bounds ATTRIBUTE_UNUSED
,
2142 rtx to ATTRIBUTE_UNUSED
)
2148 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
2154 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
2155 rtx bounds ATTRIBUTE_UNUSED
)
2160 /* Default version of canonicalize_comparison. */
2163 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
2167 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
2170 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
2174 #ifndef PAD_VARARGS_DOWN
2175 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2178 /* Build an indirect-ref expression over the given TREE, which represents a
2179 piece of a va_arg() expansion. */
2181 build_va_arg_indirect_ref (tree addr
)
2183 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
2187 /* The "standard" implementation of va_arg: read the value from the
2188 current (padded) address and increment by the (padded) size. */
2191 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
2194 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
2195 unsigned HOST_WIDE_INT align
, boundary
;
2198 /* All of the alignment and movement below is for args-grow-up machines.
2199 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2200 implement their own specialized gimplify_va_arg_expr routines. */
2201 if (ARGS_GROW_DOWNWARD
)
2204 indirect
= pass_va_arg_by_reference (type
);
2206 type
= build_pointer_type (type
);
2208 if (targetm
.calls
.split_complex_arg
2209 && TREE_CODE (type
) == COMPLEX_TYPE
2210 && targetm
.calls
.split_complex_arg (type
))
2212 tree real_part
, imag_part
;
2214 real_part
= std_gimplify_va_arg_expr (valist
,
2215 TREE_TYPE (type
), pre_p
, NULL
);
2216 real_part
= get_initialized_tmp_var (real_part
, pre_p
);
2218 imag_part
= std_gimplify_va_arg_expr (unshare_expr (valist
),
2219 TREE_TYPE (type
), pre_p
, NULL
);
2220 imag_part
= get_initialized_tmp_var (imag_part
, pre_p
);
2222 return build2 (COMPLEX_EXPR
, type
, real_part
, imag_part
);
2225 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2226 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
2228 /* When we align parameter on stack for caller, if the parameter
2229 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2230 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
2231 here with caller. */
2232 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
2233 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
2235 boundary
/= BITS_PER_UNIT
;
2237 /* Hoist the valist value into a temporary for the moment. */
2238 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
);
2240 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
2241 requires greater alignment, we must perform dynamic alignment. */
2242 if (boundary
> align
2243 && !TYPE_EMPTY_P (type
)
2244 && !integer_zerop (TYPE_SIZE (type
)))
2246 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2247 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
2248 gimplify_and_add (t
, pre_p
);
2250 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2251 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
2253 build_int_cst (TREE_TYPE (valist
), -boundary
)));
2254 gimplify_and_add (t
, pre_p
);
2259 /* If the actual alignment is less than the alignment of the type,
2260 adjust the type accordingly so that we don't assume strict alignment
2261 when dereferencing the pointer. */
2262 boundary
*= BITS_PER_UNIT
;
2263 if (boundary
< TYPE_ALIGN (type
))
2265 type
= build_variant_type_copy (type
);
2266 SET_TYPE_ALIGN (type
, boundary
);
2269 /* Compute the rounded size of the type. */
2270 type_size
= arg_size_in_bytes (type
);
2271 rounded_size
= round_up (type_size
, align
);
2273 /* Reduce rounded_size so it's sharable with the postqueue. */
2274 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2278 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2280 /* Small args are padded downward. */
2281 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2282 rounded_size
, size_int (align
));
2283 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2284 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2285 addr
= fold_build_pointer_plus (addr
, t
);
2288 /* Compute new value for AP. */
2289 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2290 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2291 gimplify_and_add (t
, pre_p
);
2293 addr
= fold_convert (build_pointer_type (type
), addr
);
2296 addr
= build_va_arg_indirect_ref (addr
);
2298 return build_va_arg_indirect_ref (addr
);
2301 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2302 not support nested low-overhead loops. */
2305 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2306 unsigned int loop_depth
, bool)
2308 return loop_depth
== 1;
2311 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2314 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2319 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2322 default_max_noce_ifcvt_seq_cost (edge e
)
2324 bool predictable_p
= predictable_edge_p (e
);
2328 if (global_options_set
.x_param_max_rtl_if_conversion_predictable_cost
)
2329 return param_max_rtl_if_conversion_predictable_cost
;
2333 if (global_options_set
.x_param_max_rtl_if_conversion_unpredictable_cost
)
2334 return param_max_rtl_if_conversion_unpredictable_cost
;
2337 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2340 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2343 default_min_arithmetic_precision (void)
2345 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2348 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2350 enum flt_eval_method
2351 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2353 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2356 /* Default implementation for
2357 TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE. */
2359 default_stack_clash_protection_alloca_probe_range (void)
2364 /* The default implementation of TARGET_EARLY_REMAT_MODES. */
2367 default_select_early_remat_modes (sbitmap
)
2371 /* The default implementation of TARGET_PREFERRED_ELSE_VALUE. */
2374 default_preferred_else_value (unsigned, tree type
, unsigned, tree
*)
2376 return build_zero_cst (type
);
2379 /* Default implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE. */
2381 default_have_speculation_safe_value (bool active ATTRIBUTE_UNUSED
)
2383 #ifdef HAVE_speculation_barrier
2384 return active
? HAVE_speculation_barrier
: true;
2389 /* Alternative implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE
2390 that can be used on targets that never have speculative execution. */
2392 speculation_safe_value_not_needed (bool active
)
2397 /* Default implementation of the speculation-safe-load builtin. This
2398 implementation simply copies val to result and generates a
2399 speculation_barrier insn, if such a pattern is defined. */
2401 default_speculation_safe_value (machine_mode mode ATTRIBUTE_UNUSED
,
2402 rtx result
, rtx val
,
2403 rtx failval ATTRIBUTE_UNUSED
)
2405 emit_move_insn (result
, val
);
2407 #ifdef HAVE_speculation_barrier
2408 /* Assume the target knows what it is doing: if it defines a
2409 speculation barrier, but it is not enabled, then assume that one
2411 if (HAVE_speculation_barrier
)
2412 emit_insn (gen_speculation_barrier ());
2418 #include "gt-targhooks.h"