1 /* Default target hook functions.
2 Copyright (C) 2003-2018 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"
87 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
88 rtx addr ATTRIBUTE_UNUSED
,
89 bool strict ATTRIBUTE_UNUSED
)
91 #ifdef GO_IF_LEGITIMATE_ADDRESS
92 /* Defer to the old implementation using a goto. */
94 return strict_memory_address_p (mode
, addr
);
96 return memory_address_p (mode
, addr
);
103 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
105 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
106 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
111 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
115 /* Any floating arithmetic may trap. */
116 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
119 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
121 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
129 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
131 int *punsignedp ATTRIBUTE_UNUSED
,
132 const_tree funtype ATTRIBUTE_UNUSED
,
133 int for_return ATTRIBUTE_UNUSED
)
135 if (type
!= NULL_TREE
&& for_return
== 2)
136 return promote_mode (type
, mode
, punsignedp
);
141 default_promote_function_mode_always_promote (const_tree type
,
144 const_tree funtype ATTRIBUTE_UNUSED
,
145 int for_return ATTRIBUTE_UNUSED
)
147 return promote_mode (type
, mode
, punsignedp
);
151 default_cc_modes_compatible (machine_mode m1
, machine_mode m2
)
159 default_return_in_memory (const_tree type
,
160 const_tree fntype ATTRIBUTE_UNUSED
)
162 return (TYPE_MODE (type
) == BLKmode
);
166 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
167 machine_mode mode ATTRIBUTE_UNUSED
)
173 default_legitimize_address_displacement (rtx
*disp ATTRIBUTE_UNUSED
,
174 rtx
*offset ATTRIBUTE_UNUSED
,
175 machine_mode mode ATTRIBUTE_UNUSED
)
181 default_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 c ATTRIBUTE_UNUSED
,
327 machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
328 bool named_arg ATTRIBUTE_UNUSED
)
330 return targetm
.calls
.must_pass_in_stack (mode
, type
);
333 /* Return true if a parameter follows callee copies conventions. This
334 version of the hook is true for all named arguments. */
337 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED
,
338 machine_mode mode ATTRIBUTE_UNUSED
,
339 const_tree type ATTRIBUTE_UNUSED
, bool named
)
344 /* Emit to STREAM the assembler syntax for insn operand X. */
347 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
348 int code ATTRIBUTE_UNUSED
)
351 PRINT_OPERAND (stream
, x
, code
);
357 /* Emit to STREAM the assembler syntax for an insn operand whose memory
361 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
362 machine_mode
/*mode*/,
363 rtx x ATTRIBUTE_UNUSED
)
365 #ifdef PRINT_OPERAND_ADDRESS
366 PRINT_OPERAND_ADDRESS (stream
, x
);
372 /* Return true if CODE is a valid punctuation character for the
373 `print_operand' hook. */
376 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
378 #ifdef PRINT_OPERAND_PUNCT_VALID_P
379 return PRINT_OPERAND_PUNCT_VALID_P (code
);
385 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
387 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
389 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
390 const char *stripped
= targetm
.strip_name_encoding (skipped
);
391 if (*name
!= '*' && user_label_prefix
[0])
392 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
393 return get_identifier (stripped
);
396 /* True if MODE is valid for the target. By "valid", we mean able to
397 be manipulated in non-trivial ways. In particular, this means all
398 the arithmetic is supported.
400 By default we guess this means that any C type is supported. If
401 we can't map the mode back to a type that would be available in C,
402 then reject it. Special case, here, is the double-word arithmetic
403 supported by optabs.c. */
406 default_scalar_mode_supported_p (scalar_mode mode
)
408 int precision
= GET_MODE_PRECISION (mode
);
410 switch (GET_MODE_CLASS (mode
))
412 case MODE_PARTIAL_INT
:
414 if (precision
== CHAR_TYPE_SIZE
)
416 if (precision
== SHORT_TYPE_SIZE
)
418 if (precision
== INT_TYPE_SIZE
)
420 if (precision
== LONG_TYPE_SIZE
)
422 if (precision
== LONG_LONG_TYPE_SIZE
)
424 if (precision
== 2 * BITS_PER_WORD
)
429 if (precision
== FLOAT_TYPE_SIZE
)
431 if (precision
== DOUBLE_TYPE_SIZE
)
433 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
437 case MODE_DECIMAL_FLOAT
:
449 /* Return true if libgcc supports floating-point mode MODE (known to
450 be supported as a scalar mode). */
453 default_libgcc_floating_mode_supported_p (scalar_float_mode mode
)
476 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
477 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
479 opt_scalar_float_mode
480 default_floatn_mode (int n
, bool extended
)
484 opt_scalar_float_mode cand1
, cand2
;
485 scalar_float_mode mode
;
507 /* Those are the only valid _FloatNx types. */
510 if (cand1
.exists (&mode
)
511 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
512 && targetm
.scalar_mode_supported_p (mode
)
513 && targetm
.libgcc_floating_mode_supported_p (mode
))
515 if (cand2
.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
))
523 opt_scalar_float_mode cand
;
524 scalar_float_mode mode
;
528 /* Always enable _Float16 if we have basic support for the mode.
529 Targets can control the range and precision of operations on
530 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
557 if (cand
.exists (&mode
)
558 && REAL_MODE_FORMAT (mode
)->ieee_bits
== n
559 && targetm
.scalar_mode_supported_p (mode
)
560 && targetm
.libgcc_floating_mode_supported_p (mode
))
563 return opt_scalar_float_mode ();
566 /* Define this to return true if the _Floatn and _Floatnx built-in functions
567 should implicitly enable the built-in function without the __builtin_ prefix
568 in addition to the normal built-in function with the __builtin_ prefix. The
569 default is to only enable built-in functions without the __builtin_ prefix
570 for the GNU C langauge. The argument FUNC is the enum builtin_in_function
571 id of the function to be enabled. */
574 default_floatn_builtin_p (int func ATTRIBUTE_UNUSED
)
576 static bool first_time_p
= true;
577 static bool c_or_objective_c
;
581 first_time_p
= false;
582 c_or_objective_c
= lang_GNU_C () || lang_GNU_OBJC ();
585 return c_or_objective_c
;
588 /* Make some target macros useable by target-independent code. */
590 targhook_words_big_endian (void)
592 return !!WORDS_BIG_ENDIAN
;
596 targhook_float_words_big_endian (void)
598 return !!FLOAT_WORDS_BIG_ENDIAN
;
601 /* True if the target supports floating-point exceptions and rounding
605 default_float_exceptions_rounding_supported_p (void)
614 /* True if the target supports decimal floating point. */
617 default_decimal_float_supported_p (void)
619 return ENABLE_DECIMAL_FLOAT
;
622 /* True if the target supports fixed-point arithmetic. */
625 default_fixed_point_supported_p (void)
627 return ENABLE_FIXED_POINT
;
630 /* True if the target supports GNU indirect functions. */
633 default_has_ifunc_p (void)
635 return HAVE_GNU_INDIRECT_FUNCTION
;
638 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
641 This function checks whether a given INSN is valid within a low-overhead
642 loop. If INSN is invalid it returns the reason for that, otherwise it
643 returns NULL. A called function may clobber any special registers required
644 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
645 register for branch on table instructions. We reject the doloop pattern in
649 default_invalid_within_doloop (const rtx_insn
*insn
)
652 return "Function call in loop.";
654 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
655 return "Computed branch in the loop.";
660 /* Mapping of builtin functions to vectorized variants. */
663 default_builtin_vectorized_function (unsigned int, tree
, tree
)
668 /* Mapping of target builtin functions to vectorized variants. */
671 default_builtin_md_vectorized_function (tree
, tree
, tree
)
676 /* Vectorized conversion. */
679 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
680 tree dest_type ATTRIBUTE_UNUSED
,
681 tree src_type ATTRIBUTE_UNUSED
)
686 /* Default vectorizer cost model values. */
689 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
691 int misalign ATTRIBUTE_UNUSED
)
693 switch (type_of_cost
)
703 case cond_branch_not_taken
:
705 case vec_promote_demote
:
709 case unaligned_store
:
712 case cond_branch_taken
:
716 return estimated_poly_value (TYPE_VECTOR_SUBPARTS (vectype
)) - 1;
726 default_builtin_reciprocal (tree
)
732 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
733 cumulative_args_t ca ATTRIBUTE_UNUSED
,
734 machine_mode mode ATTRIBUTE_UNUSED
,
735 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
741 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
742 cumulative_args_t ca ATTRIBUTE_UNUSED
,
743 machine_mode mode ATTRIBUTE_UNUSED
,
744 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
750 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
751 cumulative_args_t ca ATTRIBUTE_UNUSED
,
752 machine_mode mode ATTRIBUTE_UNUSED
,
753 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
759 hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED
,
760 tree ATTRIBUTE_UNUSED
)
765 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
766 machine_mode mode ATTRIBUTE_UNUSED
,
767 const_tree type ATTRIBUTE_UNUSED
,
768 bool named ATTRIBUTE_UNUSED
)
773 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET. */
776 default_function_arg_offset (machine_mode
, const_tree
)
781 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
782 upward, but pad short args downward on big-endian machines. */
785 default_function_arg_padding (machine_mode mode
, const_tree type
)
787 if (!BYTES_BIG_ENDIAN
)
790 unsigned HOST_WIDE_INT size
;
793 if (!type
|| TREE_CODE (TYPE_SIZE (type
)) != INTEGER_CST
)
795 size
= int_size_in_bytes (type
);
798 /* Targets with variable-sized modes must override this hook
799 and handle variable-sized modes explicitly. */
800 size
= GET_MODE_SIZE (mode
).to_constant ();
802 if (size
< (PARM_BOUNDARY
/ BITS_PER_UNIT
))
809 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
810 machine_mode mode ATTRIBUTE_UNUSED
,
811 const_tree type ATTRIBUTE_UNUSED
,
812 bool named ATTRIBUTE_UNUSED
)
818 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
819 machine_mode mode ATTRIBUTE_UNUSED
,
820 const_tree type ATTRIBUTE_UNUSED
,
821 bool named ATTRIBUTE_UNUSED
)
827 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
828 const_tree type ATTRIBUTE_UNUSED
)
830 return PARM_BOUNDARY
;
834 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
835 const_tree type ATTRIBUTE_UNUSED
)
837 return PARM_BOUNDARY
;
841 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
846 hook_invalid_arg_for_unprototyped_fn (
847 const_tree typelist ATTRIBUTE_UNUSED
,
848 const_tree funcdecl ATTRIBUTE_UNUSED
,
849 const_tree val ATTRIBUTE_UNUSED
)
854 /* Initialize the stack protection decls. */
856 /* Stack protection related decls living in libgcc. */
857 static GTY(()) tree stack_chk_guard_decl
;
860 default_stack_protect_guard (void)
862 tree t
= stack_chk_guard_decl
;
868 t
= build_decl (UNKNOWN_LOCATION
,
869 VAR_DECL
, get_identifier ("__stack_chk_guard"),
873 DECL_EXTERNAL (t
) = 1;
875 TREE_THIS_VOLATILE (t
) = 1;
876 DECL_ARTIFICIAL (t
) = 1;
877 DECL_IGNORED_P (t
) = 1;
879 /* Do not share RTL as the declaration is visible outside of
882 RTX_FLAG (x
, used
) = 1;
884 stack_chk_guard_decl
= t
;
890 static GTY(()) tree stack_chk_fail_decl
;
893 default_external_stack_protect_fail (void)
895 tree t
= stack_chk_fail_decl
;
899 t
= build_function_type_list (void_type_node
, NULL_TREE
);
900 t
= build_decl (UNKNOWN_LOCATION
,
901 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
904 DECL_EXTERNAL (t
) = 1;
906 TREE_THIS_VOLATILE (t
) = 1;
907 TREE_NOTHROW (t
) = 1;
908 DECL_ARTIFICIAL (t
) = 1;
909 DECL_IGNORED_P (t
) = 1;
910 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
911 DECL_VISIBILITY_SPECIFIED (t
) = 1;
913 stack_chk_fail_decl
= t
;
916 return build_call_expr (t
, 0);
920 default_hidden_stack_protect_fail (void)
922 #ifndef HAVE_GAS_HIDDEN
923 return default_external_stack_protect_fail ();
925 tree t
= stack_chk_fail_decl
;
928 return default_external_stack_protect_fail ();
932 t
= build_function_type_list (void_type_node
, NULL_TREE
);
933 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
934 get_identifier ("__stack_chk_fail_local"), t
);
937 DECL_EXTERNAL (t
) = 1;
939 TREE_THIS_VOLATILE (t
) = 1;
940 TREE_NOTHROW (t
) = 1;
941 DECL_ARTIFICIAL (t
) = 1;
942 DECL_IGNORED_P (t
) = 1;
943 DECL_VISIBILITY_SPECIFIED (t
) = 1;
944 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
946 stack_chk_fail_decl
= t
;
949 return build_call_expr (t
, 0);
954 hook_bool_const_rtx_commutative_p (const_rtx x
,
955 int outer_code ATTRIBUTE_UNUSED
)
957 return COMMUTATIVE_P (x
);
961 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
962 const_tree fn_decl_or_type
,
963 bool outgoing ATTRIBUTE_UNUSED
)
965 /* The old interface doesn't handle receiving the function type. */
967 && !DECL_P (fn_decl_or_type
))
968 fn_decl_or_type
= NULL
;
970 #ifdef FUNCTION_VALUE
971 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
978 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
979 const_rtx fun ATTRIBUTE_UNUSED
)
982 return LIBCALL_VALUE (MACRO_MODE (mode
));
988 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
991 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
993 #ifdef FUNCTION_VALUE_REGNO_P
994 return FUNCTION_VALUE_REGNO_P (regno
);
1001 default_internal_arg_pointer (void)
1003 /* If the reg that the virtual arg pointer will be translated into is
1004 not a fixed reg or is the stack pointer, make a copy of the virtual
1005 arg pointer, and address parms via the copy. The frame pointer is
1006 considered fixed even though it is not marked as such. */
1007 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
1008 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
1009 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
1010 return copy_to_reg (virtual_incoming_args_rtx
);
1012 return virtual_incoming_args_rtx
;
1016 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
1020 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1021 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
1025 #ifdef STATIC_CHAIN_REGNUM
1026 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
1030 static bool issued_error
;
1033 issued_error
= true;
1034 sorry ("nested functions not supported on this target");
1037 /* It really doesn't matter what we return here, so long at it
1038 doesn't cause the rest of the compiler to crash. */
1039 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
1044 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
1045 rtx
ARG_UNUSED (r_chain
))
1047 sorry ("nested function trampolines not supported on this target");
1051 default_return_pops_args (tree
, tree
, poly_int64
)
1057 default_branch_target_register_class (void)
1063 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
1065 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1071 default_lra_p (void)
1077 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1083 default_register_usage_leveling_p (void)
1089 default_different_addr_displacement_p (void)
1095 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1096 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1097 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1098 secondary_reload_info
*sri
)
1100 enum reg_class rclass
= NO_REGS
;
1101 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1103 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1105 sri
->icode
= sri
->prev_sri
->t_icode
;
1108 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1110 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
,
1111 MACRO_MODE (reload_mode
), x
);
1113 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1115 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
,
1116 MACRO_MODE (reload_mode
), x
);
1118 if (rclass
!= NO_REGS
)
1120 enum insn_code icode
1121 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1124 if (icode
!= CODE_FOR_nothing
1125 && !insn_operand_matches (icode
, in_p
, x
))
1126 icode
= CODE_FOR_nothing
;
1127 else if (icode
!= CODE_FOR_nothing
)
1129 const char *insn_constraint
, *scratch_constraint
;
1130 enum reg_class insn_class
, scratch_class
;
1132 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1133 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1134 if (!*insn_constraint
)
1135 insn_class
= ALL_REGS
;
1140 gcc_assert (*insn_constraint
== '=');
1143 insn_class
= (reg_class_for_constraint
1144 (lookup_constraint (insn_constraint
)));
1145 gcc_assert (insn_class
!= NO_REGS
);
1148 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1149 /* The scratch register's constraint must start with "=&",
1150 except for an input reload, where only "=" is necessary,
1151 and where it might be beneficial to re-use registers from
1153 gcc_assert (scratch_constraint
[0] == '='
1154 && (in_p
|| scratch_constraint
[1] == '&'));
1155 scratch_constraint
++;
1156 if (*scratch_constraint
== '&')
1157 scratch_constraint
++;
1158 scratch_class
= (reg_class_for_constraint
1159 (lookup_constraint (scratch_constraint
)));
1161 if (reg_class_subset_p (reload_class
, insn_class
))
1163 gcc_assert (scratch_class
== rclass
);
1167 rclass
= insn_class
;
1170 if (rclass
== NO_REGS
)
1173 sri
->t_icode
= icode
;
1178 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE. */
1181 default_secondary_memory_needed_mode (machine_mode mode
)
1183 if (!targetm
.lra_p ()
1184 && known_lt (GET_MODE_BITSIZE (mode
), BITS_PER_WORD
)
1185 && INTEGRAL_MODE_P (mode
))
1186 return mode_for_size (BITS_PER_WORD
, GET_MODE_CLASS (mode
), 0).require ();
1190 /* By default, if flag_pic is true, then neither local nor global relocs
1191 should be placed in readonly memory. */
1194 default_reloc_rw_mask (void)
1196 return flag_pic
? 3 : 0;
1199 /* By default, do no modification. */
1200 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1206 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT. */
1209 default_static_rtx_alignment (machine_mode mode
)
1211 return GET_MODE_ALIGNMENT (mode
);
1214 /* The default implementation of TARGET_CONSTANT_ALIGNMENT. */
1217 default_constant_alignment (const_tree
, HOST_WIDE_INT align
)
1222 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1223 to at least BITS_PER_WORD but otherwise makes no changes. */
1226 constant_alignment_word_strings (const_tree exp
, HOST_WIDE_INT align
)
1228 if (TREE_CODE (exp
) == STRING_CST
)
1229 return MAX (align
, BITS_PER_WORD
);
1233 /* Default to natural alignment for vector types. */
1235 default_vector_alignment (const_tree type
)
1237 HOST_WIDE_INT align
= tree_to_shwi (TYPE_SIZE (type
));
1238 if (align
> MAX_OFILE_ALIGNMENT
)
1239 align
= MAX_OFILE_ALIGNMENT
;
1243 /* The default implementation of
1244 TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT. */
1247 default_preferred_vector_alignment (const_tree type
)
1249 return TYPE_ALIGN (type
);
1252 /* By default assume vectors of element TYPE require a multiple of the natural
1253 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1255 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1260 /* By default, assume that a target supports any factor of misalignment
1261 memory access if it supports movmisalign patten.
1262 is_packed is true if the memory access is defined in a packed struct. */
1264 default_builtin_support_vector_misalignment (machine_mode mode
,
1272 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1277 /* By default, only attempt to parallelize bitwise operations, and
1278 possibly adds/subtracts using bit-twiddling. */
1281 default_preferred_simd_mode (scalar_mode
)
1286 /* By default do not split reductions further. */
1289 default_split_reduction (machine_mode mode
)
1294 /* By default only the size derived from the preferred vector mode
1298 default_autovectorize_vector_sizes (vector_sizes
*)
1302 /* By default a vector of integers is used as a mask. */
1305 default_get_mask_mode (poly_uint64 nunits
, poly_uint64 vector_size
)
1307 unsigned int elem_size
= vector_element_size (vector_size
, nunits
);
1308 scalar_int_mode elem_mode
1309 = smallest_int_mode_for_size (elem_size
* BITS_PER_UNIT
);
1310 machine_mode vector_mode
;
1312 gcc_assert (known_eq (elem_size
* nunits
, vector_size
));
1314 if (mode_for_vector (elem_mode
, nunits
).exists (&vector_mode
)
1315 && VECTOR_MODE_P (vector_mode
)
1316 && targetm
.vector_mode_supported_p (vector_mode
))
1319 return opt_machine_mode ();
1322 /* By default, the cost model accumulates three separate costs (prologue,
1323 loop body, and epilogue) for a vectorized loop or block. So allocate an
1324 array of three unsigned ints, set it to zero, and return its address. */
1327 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1329 unsigned *cost
= XNEWVEC (unsigned, 3);
1330 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1334 /* By default, the cost model looks up the cost of the given statement
1335 kind and mode, multiplies it by the occurrence count, accumulates
1336 it into the cost specified by WHERE, and returns the cost added. */
1339 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1340 struct _stmt_vec_info
*stmt_info
, int misalign
,
1341 enum vect_cost_model_location where
)
1343 unsigned *cost
= (unsigned *) data
;
1344 unsigned retval
= 0;
1346 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1347 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1349 /* Statements in an inner loop relative to the loop being
1350 vectorized are weighted more heavily. The value here is
1351 arbitrary and could potentially be improved with analysis. */
1352 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1353 count
*= 50; /* FIXME. */
1355 retval
= (unsigned) (count
* stmt_cost
);
1356 cost
[where
] += retval
;
1361 /* By default, the cost model just returns the accumulated costs. */
1364 default_finish_cost (void *data
, unsigned *prologue_cost
,
1365 unsigned *body_cost
, unsigned *epilogue_cost
)
1367 unsigned *cost
= (unsigned *) data
;
1368 *prologue_cost
= cost
[vect_prologue
];
1369 *body_cost
= cost
[vect_body
];
1370 *epilogue_cost
= cost
[vect_epilogue
];
1373 /* Free the cost data. */
1376 default_destroy_cost_data (void *data
)
1381 /* Determine whether or not a pointer mode is valid. Assume defaults
1382 of ptr_mode or Pmode - can be overridden. */
1384 default_valid_pointer_mode (scalar_int_mode mode
)
1386 return (mode
== ptr_mode
|| mode
== Pmode
);
1389 /* Determine whether the memory reference specified by REF may alias
1390 the C libraries errno location. */
1392 default_ref_may_alias_errno (ao_ref
*ref
)
1394 tree base
= ao_ref_base (ref
);
1395 /* The default implementation assumes the errno location is
1396 a declaration of type int or is always accessed via a
1397 pointer to int. We assume that accesses to errno are
1398 not deliberately obfuscated (even in conforming ways). */
1399 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1400 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1402 /* The default implementation assumes an errno location
1403 declaration is never defined in the current compilation unit. */
1405 && !TREE_STATIC (base
))
1407 else if (TREE_CODE (base
) == MEM_REF
1408 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1410 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1411 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1416 /* Return the mode for a pointer to a given ADDRSPACE,
1417 defaulting to ptr_mode for all address spaces. */
1420 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1425 /* Return the mode for an address in a given ADDRSPACE,
1426 defaulting to Pmode for all address spaces. */
1429 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1434 /* Named address space version of valid_pointer_mode.
1435 To match the above, the same modes apply to all address spaces. */
1438 default_addr_space_valid_pointer_mode (scalar_int_mode mode
,
1439 addr_space_t as ATTRIBUTE_UNUSED
)
1441 return targetm
.valid_pointer_mode (mode
);
1444 /* Some places still assume that all pointer or address modes are the
1445 standard Pmode and ptr_mode. These optimizations become invalid if
1446 the target actually supports multiple different modes. For now,
1447 we disable such optimizations on such targets, using this function. */
1450 target_default_pointer_address_modes_p (void)
1452 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1454 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1460 /* Named address space version of legitimate_address_p.
1461 By default, all address spaces have the same form. */
1464 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1466 addr_space_t as ATTRIBUTE_UNUSED
)
1468 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1471 /* Named address space version of LEGITIMIZE_ADDRESS.
1472 By default, all address spaces have the same form. */
1475 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1476 addr_space_t as ATTRIBUTE_UNUSED
)
1478 return targetm
.legitimize_address (x
, oldx
, mode
);
1481 /* The default hook for determining if one named address space is a subset of
1482 another and to return which address space to use as the common address
1486 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1488 return (subset
== superset
);
1491 /* The default hook for determining if 0 within a named address
1492 space is a valid address. */
1495 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1500 /* The default hook for debugging the address space is to return the
1501 address space number to indicate DW_AT_address_class. */
1503 default_addr_space_debug (addr_space_t as
)
1508 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1509 Don't complain about any address space. */
1512 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1517 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1518 called for targets with only a generic address space. */
1521 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1522 tree from_type ATTRIBUTE_UNUSED
,
1523 tree to_type ATTRIBUTE_UNUSED
)
1528 /* The defualt implementation of TARGET_HARD_REGNO_NREGS. */
1531 default_hard_regno_nregs (unsigned int, machine_mode mode
)
1533 /* Targets with variable-sized modes must provide their own definition
1535 return CEIL (GET_MODE_SIZE (mode
).to_constant (), UNITS_PER_WORD
);
1539 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1544 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1547 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1548 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1554 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1555 tree
ARG_UNUSED (name
),
1556 tree
ARG_UNUSED (args
),
1557 int ARG_UNUSED (flags
))
1559 warning (OPT_Wattributes
,
1560 "target attribute is not supported on this machine");
1566 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1567 tree
ARG_UNUSED (pop_target
))
1569 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1570 emit no warning because "#pragma GCC pop_target" is valid on targets that
1571 do not have the "target" pragma. */
1573 warning (OPT_Wpragmas
,
1574 "#pragma GCC target is not supported for this machine");
1580 default_target_can_inline_p (tree caller
, tree callee
)
1582 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1583 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1585 callee_opts
= target_option_default_node
;
1587 caller_opts
= target_option_default_node
;
1589 /* If both caller and callee have attributes, assume that if the
1590 pointer is different, the two functions have different target
1591 options since build_target_option_node uses a hash table for the
1593 return callee_opts
== caller_opts
;
1596 /* If the machine does not have a case insn that compares the bounds,
1597 this means extra overhead for dispatch tables, which raises the
1598 threshold for using them. */
1601 default_case_values_threshold (void)
1603 return (targetm
.have_casesi () ? 4 : 5);
1607 default_have_conditional_execution (void)
1609 return HAVE_conditional_execution
;
1612 /* By default we assume that c99 functions are present at the runtime,
1613 but sincos is not. */
1615 default_libc_has_function (enum function_class fn_class
)
1617 if (fn_class
== function_c94
1618 || fn_class
== function_c99_misc
1619 || fn_class
== function_c99_math_complex
)
1626 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1632 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1638 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1643 /* Compute cost of moving registers to/from memory. */
1646 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1647 reg_class_t rclass ATTRIBUTE_UNUSED
,
1648 bool in ATTRIBUTE_UNUSED
)
1650 #ifndef MEMORY_MOVE_COST
1651 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1653 return MEMORY_MOVE_COST (MACRO_MODE (mode
), (enum reg_class
) rclass
, in
);
1657 /* Compute cost of moving data from a register of class FROM to one of
1661 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1662 reg_class_t from ATTRIBUTE_UNUSED
,
1663 reg_class_t to ATTRIBUTE_UNUSED
)
1665 #ifndef REGISTER_MOVE_COST
1668 return REGISTER_MOVE_COST (MACRO_MODE (mode
),
1669 (enum reg_class
) from
, (enum reg_class
) to
);
1673 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS. */
1676 default_slow_unaligned_access (machine_mode
, unsigned int)
1678 return STRICT_ALIGNMENT
;
1681 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE. */
1684 default_estimated_poly_value (poly_int64 x
)
1689 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1690 behavior. SPEED_P is true if we are compiling for speed. */
1693 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1695 unsigned int move_ratio
;
1697 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1699 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1701 #else /* No movmem patterns, pick a default. */
1702 move_ratio
= ((speed_p
) ? 15 : 3);
1708 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1709 used; return FALSE if the movmem/setmem optab should be expanded, or
1710 a call to memcpy emitted. */
1713 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1714 unsigned int alignment
,
1715 enum by_pieces_operation op
,
1718 unsigned int max_size
= 0;
1719 unsigned int ratio
= 0;
1723 case CLEAR_BY_PIECES
:
1724 max_size
= STORE_MAX_PIECES
;
1725 ratio
= CLEAR_RATIO (speed_p
);
1727 case MOVE_BY_PIECES
:
1728 max_size
= MOVE_MAX_PIECES
;
1729 ratio
= get_move_ratio (speed_p
);
1732 max_size
= STORE_MAX_PIECES
;
1733 ratio
= SET_RATIO (speed_p
);
1735 case STORE_BY_PIECES
:
1736 max_size
= STORE_MAX_PIECES
;
1737 ratio
= get_move_ratio (speed_p
);
1739 case COMPARE_BY_PIECES
:
1740 max_size
= COMPARE_MAX_PIECES
;
1741 /* Pick a likely default, just as in get_move_ratio. */
1742 ratio
= speed_p
? 15 : 3;
1746 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1749 /* This hook controls code generation for expanding a memcmp operation by
1750 pieces. Return 1 for the normal pattern of compare/jump after each pair
1751 of loads, or a higher number to reduce the number of branches. */
1754 default_compare_by_pieces_branch_ratio (machine_mode
)
1759 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1760 entry. If RECORD_P is true and the target supports named sections,
1761 the location of the NOPs will be recorded in a special object section
1762 called "__patchable_function_entries". This routine may be called
1763 twice per function to put NOPs before and after the function
1767 default_print_patchable_function_entry (FILE *file
,
1768 unsigned HOST_WIDE_INT patch_area_size
,
1771 const char *nop_templ
= 0;
1773 rtx_insn
*my_nop
= make_insn_raw (gen_nop ());
1775 /* We use the template alone, relying on the (currently sane) assumption
1776 that the NOP template does not have variable operands. */
1777 code_num
= recog_memoized (my_nop
);
1778 nop_templ
= get_insn_template (code_num
, my_nop
);
1780 if (record_p
&& targetm_common
.have_named_sections
)
1783 static int patch_area_number
;
1784 section
*previous_section
= in_section
;
1786 patch_area_number
++;
1787 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE", patch_area_number
);
1789 switch_to_section (get_section ("__patchable_function_entries",
1791 fputs (integer_asm_op (POINTER_SIZE_UNITS
, false), file
);
1792 assemble_name_raw (file
, buf
);
1795 switch_to_section (previous_section
);
1796 ASM_OUTPUT_LABEL (file
, buf
);
1800 for (i
= 0; i
< patch_area_size
; ++i
)
1801 fprintf (file
, "\t%s\n", nop_templ
);
1805 default_profile_before_prologue (void)
1807 #ifdef PROFILE_BEFORE_PROLOGUE
1814 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1817 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1820 #ifdef PREFERRED_RELOAD_CLASS
1821 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1827 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1830 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1836 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1838 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1843 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1846 default_class_likely_spilled_p (reg_class_t rclass
)
1848 return (reg_class_size
[(int) rclass
] == 1);
1851 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1854 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1855 machine_mode mode ATTRIBUTE_UNUSED
)
1857 #ifdef CLASS_MAX_NREGS
1858 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
,
1861 /* Targets with variable-sized modes must provide their own definition
1863 unsigned int size
= GET_MODE_SIZE (mode
).to_constant ();
1864 return (size
+ UNITS_PER_WORD
- 1) / UNITS_PER_WORD
;
1868 /* Determine the debugging unwind mechanism for the target. */
1870 enum unwind_info_type
1871 default_debug_unwind_info (void)
1873 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1874 /* ??? Change all users to the hook, then poison this. */
1875 #ifdef DWARF2_FRAME_INFO
1876 if (DWARF2_FRAME_INFO
)
1880 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1881 #ifdef DWARF2_DEBUGGING_INFO
1882 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1889 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
1890 must define this hook. */
1893 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
1898 /* Determine the correct mode for a Dwarf frame register that represents
1902 default_dwarf_frame_reg_mode (int regno
)
1904 machine_mode save_mode
= reg_raw_mode
[regno
];
1906 if (targetm
.hard_regno_call_part_clobbered (regno
, save_mode
))
1907 save_mode
= choose_hard_reg_mode (regno
, 1, true);
1911 /* To be used by targets where reg_raw_mode doesn't return the right
1912 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1915 default_get_reg_raw_mode (int regno
)
1917 /* Targets must override this hook if the underlying register is
1919 return as_a
<fixed_size_mode
> (reg_raw_mode
[regno
]);
1922 /* Return true if a leaf function should stay leaf even with profiling
1926 default_keep_leaf_when_profiled ()
1931 /* Return true if the state of option OPTION should be stored in PCH files
1932 and checked by default_pch_valid_p. Store the option's current state
1936 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1938 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1940 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1942 if (option_flag_var (option
, &global_options
) == &target_flags
)
1943 if (targetm
.check_pch_target_flags
)
1945 return get_option_state (&global_options
, option
, state
);
1948 /* Default version of get_pch_validity.
1949 By default, every flag difference is fatal; that will be mostly right for
1950 most targets, but completely right for very few. */
1953 default_get_pch_validity (size_t *sz
)
1955 struct cl_option_state state
;
1960 if (targetm
.check_pch_target_flags
)
1961 *sz
+= sizeof (target_flags
);
1962 for (i
= 0; i
< cl_options_count
; i
++)
1963 if (option_affects_pch_p (i
, &state
))
1966 result
= r
= XNEWVEC (char, *sz
);
1970 if (targetm
.check_pch_target_flags
)
1972 memcpy (r
, &target_flags
, sizeof (target_flags
));
1973 r
+= sizeof (target_flags
);
1976 for (i
= 0; i
< cl_options_count
; i
++)
1977 if (option_affects_pch_p (i
, &state
))
1979 memcpy (r
, state
.data
, state
.size
);
1986 /* Return a message which says that a PCH file was created with a different
1987 setting of OPTION. */
1990 pch_option_mismatch (const char *option
)
1992 return xasprintf (_("created and used with differing settings of '%s'"),
1996 /* Default version of pch_valid_p. */
1999 default_pch_valid_p (const void *data_p
, size_t len
)
2001 struct cl_option_state state
;
2002 const char *data
= (const char *)data_p
;
2005 /* -fpic and -fpie also usually make a PCH invalid. */
2006 if (data
[0] != flag_pic
)
2007 return _("created and used with different settings of -fpic");
2008 if (data
[1] != flag_pie
)
2009 return _("created and used with different settings of -fpie");
2012 /* Check target_flags. */
2013 if (targetm
.check_pch_target_flags
)
2018 memcpy (&tf
, data
, sizeof (target_flags
));
2019 data
+= sizeof (target_flags
);
2020 len
-= sizeof (target_flags
);
2021 r
= targetm
.check_pch_target_flags (tf
);
2026 for (i
= 0; i
< cl_options_count
; i
++)
2027 if (option_affects_pch_p (i
, &state
))
2029 if (memcmp (data
, state
.data
, state
.size
) != 0)
2030 return pch_option_mismatch (cl_options
[i
].opt_text
);
2038 /* Default version of cstore_mode. */
2041 default_cstore_mode (enum insn_code icode
)
2043 return as_a
<scalar_int_mode
> (insn_data
[(int) icode
].operand
[0].mode
);
2046 /* Default version of member_type_forces_blk. */
2049 default_member_type_forces_blk (const_tree
, machine_mode
)
2055 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
2056 rtx ptr ATTRIBUTE_UNUSED
,
2057 rtx bnd ATTRIBUTE_UNUSED
)
2063 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
2064 rtx addr ATTRIBUTE_UNUSED
,
2065 rtx bounds ATTRIBUTE_UNUSED
,
2066 rtx to ATTRIBUTE_UNUSED
)
2072 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
2078 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
2079 rtx bounds ATTRIBUTE_UNUSED
)
2084 /* Default version of canonicalize_comparison. */
2087 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
2091 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
2094 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
2098 #ifndef PAD_VARARGS_DOWN
2099 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2102 /* Build an indirect-ref expression over the given TREE, which represents a
2103 piece of a va_arg() expansion. */
2105 build_va_arg_indirect_ref (tree addr
)
2107 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
2111 /* The "standard" implementation of va_arg: read the value from the
2112 current (padded) address and increment by the (padded) size. */
2115 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
2118 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
2119 unsigned HOST_WIDE_INT align
, boundary
;
2122 /* All of the alignment and movement below is for args-grow-up machines.
2123 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2124 implement their own specialized gimplify_va_arg_expr routines. */
2125 if (ARGS_GROW_DOWNWARD
)
2128 indirect
= pass_by_reference (NULL
, TYPE_MODE (type
), type
, false);
2130 type
= build_pointer_type (type
);
2132 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2133 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
2135 /* When we align parameter on stack for caller, if the parameter
2136 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2137 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
2138 here with caller. */
2139 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
2140 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
2142 boundary
/= BITS_PER_UNIT
;
2144 /* Hoist the valist value into a temporary for the moment. */
2145 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
2147 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
2148 requires greater alignment, we must perform dynamic alignment. */
2149 if (boundary
> align
2150 && !TYPE_EMPTY_P (type
)
2151 && !integer_zerop (TYPE_SIZE (type
)))
2153 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2154 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
2155 gimplify_and_add (t
, pre_p
);
2157 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2158 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
2160 build_int_cst (TREE_TYPE (valist
), -boundary
)));
2161 gimplify_and_add (t
, pre_p
);
2166 /* If the actual alignment is less than the alignment of the type,
2167 adjust the type accordingly so that we don't assume strict alignment
2168 when dereferencing the pointer. */
2169 boundary
*= BITS_PER_UNIT
;
2170 if (boundary
< TYPE_ALIGN (type
))
2172 type
= build_variant_type_copy (type
);
2173 SET_TYPE_ALIGN (type
, boundary
);
2176 /* Compute the rounded size of the type. */
2177 type_size
= arg_size_in_bytes (type
);
2178 rounded_size
= round_up (type_size
, align
);
2180 /* Reduce rounded_size so it's sharable with the postqueue. */
2181 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2185 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2187 /* Small args are padded downward. */
2188 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2189 rounded_size
, size_int (align
));
2190 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2191 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2192 addr
= fold_build_pointer_plus (addr
, t
);
2195 /* Compute new value for AP. */
2196 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2197 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2198 gimplify_and_add (t
, pre_p
);
2200 addr
= fold_convert (build_pointer_type (type
), addr
);
2203 addr
= build_va_arg_indirect_ref (addr
);
2205 return build_va_arg_indirect_ref (addr
);
2209 default_chkp_bound_type (void)
2211 tree res
= make_node (POINTER_BOUNDS_TYPE
);
2212 TYPE_PRECISION (res
) = TYPE_PRECISION (size_type_node
) * 2;
2213 TYPE_NAME (res
) = get_identifier ("__bounds_type");
2214 SET_TYPE_MODE (res
, targetm
.chkp_bound_mode ());
2220 default_chkp_bound_mode (void)
2226 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED
)
2232 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED
,
2233 const_tree fn_decl_or_type ATTRIBUTE_UNUSED
,
2234 bool outgoing ATTRIBUTE_UNUSED
)
2240 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED
,
2241 HOST_WIDE_INT ub ATTRIBUTE_UNUSED
)
2247 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED
,
2248 tree lb ATTRIBUTE_UNUSED
,
2249 tree ub ATTRIBUTE_UNUSED
,
2250 tree
*stmts ATTRIBUTE_UNUSED
)
2256 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED
,
2257 machine_mode mode ATTRIBUTE_UNUSED
,
2258 tree type ATTRIBUTE_UNUSED
,
2259 int *pretend_arg_size ATTRIBUTE_UNUSED
,
2260 int second_time ATTRIBUTE_UNUSED
)
2264 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2265 not support nested low-overhead loops. */
2268 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2269 unsigned int loop_depth
, bool)
2271 return loop_depth
== 1;
2274 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2277 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2282 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2285 default_max_noce_ifcvt_seq_cost (edge e
)
2287 bool predictable_p
= predictable_edge_p (e
);
2289 enum compiler_param param
2291 ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2292 : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST
);
2294 /* If we have a parameter set, use that, otherwise take a guess using
2296 if (global_options_set
.x_param_values
[param
])
2297 return PARAM_VALUE (param
);
2299 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2302 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2305 default_min_arithmetic_precision (void)
2307 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2310 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2312 enum flt_eval_method
2313 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2315 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2319 default_stack_clash_protection_final_dynamic_probe (rtx residual ATTRIBUTE_UNUSED
)
2324 #include "gt-targhooks.h"