1 /* Default target hook functions.
2 Copyright (C) 2003-2019 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* The migration of target macros to target hooks works as follows:
22 1. Create a target hook that uses the existing target macros to
23 implement the same functionality.
25 2. Convert all the MI files to use the hook instead of the macro.
27 3. Repeat for a majority of the remaining target macros. This will
30 4. Tell target maintainers to start migrating.
32 5. Eventually convert the backends to override the hook instead of
33 defining the macros. This will take some time too.
35 6. TBD when, poison the macros. Unmigrated targets will break at
38 Note that we expect steps 1-3 to be done by the people that
39 understand what the MI does with each macro, and step 5 to be done
40 by the target maintainers for their respective targets.
42 Note that steps 1 and 2 don't have to be done together, but no
43 target can override the new hook until step 2 is complete for it.
45 Once the macros are poisoned, we will revert to the old migration
46 rules - migrate the macro, callers, and targets all at once. This
47 comment can thus be removed at that point. */
51 #include "coretypes.h"
56 #include "tree-ssa-alias.h"
57 #include "gimple-expr.h"
60 #include "stringpool.h"
62 #include "tree-ssanames.h"
63 #include "profile-count.h"
67 #include "diagnostic-core.h"
68 #include "fold-const.h"
69 #include "stor-layout.h"
76 #include "common/common-target.h"
84 #include "langhooks.h"
86 #include "function-abi.h"
89 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
90 rtx addr ATTRIBUTE_UNUSED
,
91 bool strict ATTRIBUTE_UNUSED
)
93 #ifdef GO_IF_LEGITIMATE_ADDRESS
94 /* Defer to the old implementation using a goto. */
96 return strict_memory_address_p (mode
, addr
);
98 return memory_address_p (mode
, addr
);
105 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
107 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
108 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
113 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
117 /* Any floating arithmetic may trap. */
118 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
121 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
123 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
131 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
133 int *punsignedp ATTRIBUTE_UNUSED
,
134 const_tree funtype ATTRIBUTE_UNUSED
,
135 int for_return ATTRIBUTE_UNUSED
)
137 if (type
!= NULL_TREE
&& for_return
== 2)
138 return promote_mode (type
, mode
, punsignedp
);
143 default_promote_function_mode_always_promote (const_tree type
,
146 const_tree funtype ATTRIBUTE_UNUSED
,
147 int for_return ATTRIBUTE_UNUSED
)
149 return promote_mode (type
, mode
, punsignedp
);
153 default_cc_modes_compatible (machine_mode m1
, machine_mode m2
)
161 default_return_in_memory (const_tree type
,
162 const_tree fntype ATTRIBUTE_UNUSED
)
164 return (TYPE_MODE (type
) == BLKmode
);
168 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
169 machine_mode mode ATTRIBUTE_UNUSED
)
175 default_legitimize_address_displacement (rtx
*, rtx
*, poly_int64
,
182 default_const_not_ok_for_debug_p (rtx x
)
184 if (GET_CODE (x
) == UNSPEC
)
190 default_expand_builtin_saveregs (void)
192 error ("%<__builtin_saveregs%> not supported by this target");
197 default_setup_incoming_varargs (cumulative_args_t
,
198 const function_arg_info
&, int *, int)
202 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
205 default_builtin_setjmp_frame_value (void)
207 return virtual_stack_vars_rtx
;
210 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
213 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
219 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
221 return (targetm
.calls
.setup_incoming_varargs
222 != default_setup_incoming_varargs
);
226 default_eh_return_filter_mode (void)
228 return targetm
.unwind_word_mode ();
232 default_libgcc_cmp_return_mode (void)
238 default_libgcc_shift_count_mode (void)
244 default_unwind_word_mode (void)
249 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
251 unsigned HOST_WIDE_INT
252 default_shift_truncation_mask (machine_mode mode
)
254 return SHIFT_COUNT_TRUNCATED
? GET_MODE_UNIT_BITSIZE (mode
) - 1 : 0;
257 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
260 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED
)
262 return have_insn_for (DIV
, mode
) ? 3 : 2;
265 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
268 default_mode_rep_extended (scalar_int_mode
, scalar_int_mode
)
273 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
276 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
281 /* Return machine mode for non-standard suffix
282 or VOIDmode if non-standard suffixes are unsupported. */
284 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
289 /* The generic C++ ABI specifies this is a 64-bit value. */
291 default_cxx_guard_type (void)
293 return long_long_integer_type_node
;
296 /* Returns the size of the cookie to use when allocating an array
297 whose elements have the indicated TYPE. Assumes that it is already
298 known that a cookie is needed. */
301 default_cxx_get_cookie_size (tree type
)
305 /* We need to allocate an additional max (sizeof (size_t), alignof
306 (true_type)) bytes. */
310 sizetype_size
= size_in_bytes (sizetype
);
311 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
312 if (tree_int_cst_lt (type_align
, sizetype_size
))
313 cookie_size
= sizetype_size
;
315 cookie_size
= type_align
;
320 /* Return true if a parameter must be passed by reference. This version
321 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
324 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t
,
325 const function_arg_info
&arg
)
327 return targetm
.calls
.must_pass_in_stack (arg
);
330 /* Return true if a parameter follows callee copies conventions. This
331 version of the hook is true for all named arguments. */
334 hook_callee_copies_named (cumulative_args_t
, const function_arg_info
&arg
)
339 /* Emit to STREAM the assembler syntax for insn operand X. */
342 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
343 int code ATTRIBUTE_UNUSED
)
346 PRINT_OPERAND (stream
, x
, code
);
352 /* Emit to STREAM the assembler syntax for an insn operand whose memory
356 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
357 machine_mode
/*mode*/,
358 rtx x ATTRIBUTE_UNUSED
)
360 #ifdef PRINT_OPERAND_ADDRESS
361 PRINT_OPERAND_ADDRESS (stream
, x
);
367 /* Return true if CODE is a valid punctuation character for the
368 `print_operand' hook. */
371 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
373 #ifdef PRINT_OPERAND_PUNCT_VALID_P
374 return PRINT_OPERAND_PUNCT_VALID_P (code
);
380 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
382 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
384 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
385 const char *stripped
= targetm
.strip_name_encoding (skipped
);
386 if (*name
!= '*' && user_label_prefix
[0])
387 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
388 return get_identifier (stripped
);
391 /* The default implementation of TARGET_TRANSLATE_MODE_ATTRIBUTE. */
394 default_translate_mode_attribute (machine_mode mode
)
399 /* True if MODE is valid for the target. By "valid", we mean able to
400 be manipulated in non-trivial ways. In particular, this means all
401 the arithmetic is supported.
403 By default we guess this means that any C type is supported. If
404 we can't map the mode back to a type that would be available in C,
405 then reject it. Special case, here, is the double-word arithmetic
406 supported by optabs.c. */
409 default_scalar_mode_supported_p (scalar_mode mode
)
411 int precision
= GET_MODE_PRECISION (mode
);
413 switch (GET_MODE_CLASS (mode
))
415 case MODE_PARTIAL_INT
:
417 if (precision
== CHAR_TYPE_SIZE
)
419 if (precision
== SHORT_TYPE_SIZE
)
421 if (precision
== INT_TYPE_SIZE
)
423 if (precision
== LONG_TYPE_SIZE
)
425 if (precision
== LONG_LONG_TYPE_SIZE
)
427 if (precision
== 2 * BITS_PER_WORD
)
432 if (precision
== FLOAT_TYPE_SIZE
)
434 if (precision
== DOUBLE_TYPE_SIZE
)
436 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
440 case MODE_DECIMAL_FLOAT
:
452 /* Return true if libgcc supports floating-point mode MODE (known to
453 be supported as a scalar mode). */
456 default_libgcc_floating_mode_supported_p (scalar_float_mode mode
)
479 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
480 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
482 opt_scalar_float_mode
483 default_floatn_mode (int n
, bool extended
)
487 opt_scalar_float_mode cand1
, cand2
;
488 scalar_float_mode mode
;
510 /* Those are the only valid _FloatNx types. */
513 if (cand1
.exists (&mode
)
514 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
515 && targetm
.scalar_mode_supported_p (mode
)
516 && targetm
.libgcc_floating_mode_supported_p (mode
))
518 if (cand2
.exists (&mode
)
519 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
520 && targetm
.scalar_mode_supported_p (mode
)
521 && targetm
.libgcc_floating_mode_supported_p (mode
))
526 opt_scalar_float_mode cand
;
527 scalar_float_mode mode
;
531 /* Always enable _Float16 if we have basic support for the mode.
532 Targets can control the range and precision of operations on
533 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
560 if (cand
.exists (&mode
)
561 && REAL_MODE_FORMAT (mode
)->ieee_bits
== n
562 && targetm
.scalar_mode_supported_p (mode
)
563 && targetm
.libgcc_floating_mode_supported_p (mode
))
566 return opt_scalar_float_mode ();
569 /* Define this to return true if the _Floatn and _Floatnx built-in functions
570 should implicitly enable the built-in function without the __builtin_ prefix
571 in addition to the normal built-in function with the __builtin_ prefix. The
572 default is to only enable built-in functions without the __builtin_ prefix
573 for the GNU C langauge. The argument FUNC is the enum builtin_in_function
574 id of the function to be enabled. */
577 default_floatn_builtin_p (int func ATTRIBUTE_UNUSED
)
579 static bool first_time_p
= true;
580 static bool c_or_objective_c
;
584 first_time_p
= false;
585 c_or_objective_c
= lang_GNU_C () || lang_GNU_OBJC ();
588 return c_or_objective_c
;
591 /* Make some target macros useable by target-independent code. */
593 targhook_words_big_endian (void)
595 return !!WORDS_BIG_ENDIAN
;
599 targhook_float_words_big_endian (void)
601 return !!FLOAT_WORDS_BIG_ENDIAN
;
604 /* True if the target supports floating-point exceptions and rounding
608 default_float_exceptions_rounding_supported_p (void)
617 /* True if the target supports decimal floating point. */
620 default_decimal_float_supported_p (void)
622 return ENABLE_DECIMAL_FLOAT
;
625 /* True if the target supports fixed-point arithmetic. */
628 default_fixed_point_supported_p (void)
630 return ENABLE_FIXED_POINT
;
633 /* True if the target supports GNU indirect functions. */
636 default_has_ifunc_p (void)
638 return HAVE_GNU_INDIRECT_FUNCTION
;
641 /* Return true if we predict the loop LOOP will be transformed to a
642 low-overhead loop, otherwise return false.
644 By default, false is returned, as this hook's applicability should be
645 verified for each target. Target maintainers should re-define the hook
646 if the target can take advantage of it. */
649 default_predict_doloop_p (class loop
*loop ATTRIBUTE_UNUSED
)
654 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
657 This function checks whether a given INSN is valid within a low-overhead
658 loop. If INSN is invalid it returns the reason for that, otherwise it
659 returns NULL. A called function may clobber any special registers required
660 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
661 register for branch on table instructions. We reject the doloop pattern in
665 default_invalid_within_doloop (const rtx_insn
*insn
)
668 return "Function call in loop.";
670 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
671 return "Computed branch in the loop.";
676 /* Mapping of builtin functions to vectorized variants. */
679 default_builtin_vectorized_function (unsigned int, tree
, tree
)
684 /* Mapping of target builtin functions to vectorized variants. */
687 default_builtin_md_vectorized_function (tree
, tree
, tree
)
692 /* Vectorized conversion. */
695 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
696 tree dest_type ATTRIBUTE_UNUSED
,
697 tree src_type ATTRIBUTE_UNUSED
)
702 /* Default vectorizer cost model values. */
705 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
707 int misalign ATTRIBUTE_UNUSED
)
709 switch (type_of_cost
)
719 case cond_branch_not_taken
:
721 case vec_promote_demote
:
725 case unaligned_store
:
728 case cond_branch_taken
:
732 return estimated_poly_value (TYPE_VECTOR_SUBPARTS (vectype
)) - 1;
742 default_builtin_reciprocal (tree
)
748 hook_bool_CUMULATIVE_ARGS_arg_info_false (cumulative_args_t
,
749 const function_arg_info
&)
755 hook_bool_CUMULATIVE_ARGS_arg_info_true (cumulative_args_t
,
756 const function_arg_info
&)
762 hook_int_CUMULATIVE_ARGS_arg_info_0 (cumulative_args_t
,
763 const function_arg_info
&)
769 hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED
,
770 tree ATTRIBUTE_UNUSED
)
775 default_function_arg_advance (cumulative_args_t
, const function_arg_info
&)
780 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET. */
783 default_function_arg_offset (machine_mode
, const_tree
)
788 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
789 upward, but pad short args downward on big-endian machines. */
792 default_function_arg_padding (machine_mode mode
, const_tree type
)
794 if (!BYTES_BIG_ENDIAN
)
797 unsigned HOST_WIDE_INT size
;
800 if (!type
|| TREE_CODE (TYPE_SIZE (type
)) != INTEGER_CST
)
802 size
= int_size_in_bytes (type
);
805 /* Targets with variable-sized modes must override this hook
806 and handle variable-sized modes explicitly. */
807 size
= GET_MODE_SIZE (mode
).to_constant ();
809 if (size
< (PARM_BOUNDARY
/ BITS_PER_UNIT
))
816 default_function_arg (cumulative_args_t
, const function_arg_info
&)
822 default_function_incoming_arg (cumulative_args_t
, const function_arg_info
&)
828 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
829 const_tree type ATTRIBUTE_UNUSED
)
831 return PARM_BOUNDARY
;
835 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
836 const_tree type ATTRIBUTE_UNUSED
)
838 return PARM_BOUNDARY
;
842 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
847 hook_invalid_arg_for_unprototyped_fn (
848 const_tree typelist ATTRIBUTE_UNUSED
,
849 const_tree funcdecl ATTRIBUTE_UNUSED
,
850 const_tree val ATTRIBUTE_UNUSED
)
855 /* Initialize the stack protection decls. */
857 /* Stack protection related decls living in libgcc. */
858 static GTY(()) tree stack_chk_guard_decl
;
861 default_stack_protect_guard (void)
863 tree t
= stack_chk_guard_decl
;
869 t
= build_decl (UNKNOWN_LOCATION
,
870 VAR_DECL
, get_identifier ("__stack_chk_guard"),
874 DECL_EXTERNAL (t
) = 1;
876 TREE_THIS_VOLATILE (t
) = 1;
877 DECL_ARTIFICIAL (t
) = 1;
878 DECL_IGNORED_P (t
) = 1;
880 /* Do not share RTL as the declaration is visible outside of
883 RTX_FLAG (x
, used
) = 1;
885 stack_chk_guard_decl
= t
;
891 static GTY(()) tree stack_chk_fail_decl
;
894 default_external_stack_protect_fail (void)
896 tree t
= stack_chk_fail_decl
;
900 t
= build_function_type_list (void_type_node
, NULL_TREE
);
901 t
= build_decl (UNKNOWN_LOCATION
,
902 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
905 DECL_EXTERNAL (t
) = 1;
907 TREE_THIS_VOLATILE (t
) = 1;
908 TREE_NOTHROW (t
) = 1;
909 DECL_ARTIFICIAL (t
) = 1;
910 DECL_IGNORED_P (t
) = 1;
911 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
912 DECL_VISIBILITY_SPECIFIED (t
) = 1;
914 stack_chk_fail_decl
= t
;
917 return build_call_expr (t
, 0);
921 default_hidden_stack_protect_fail (void)
923 #ifndef HAVE_GAS_HIDDEN
924 return default_external_stack_protect_fail ();
926 tree t
= stack_chk_fail_decl
;
929 return default_external_stack_protect_fail ();
933 t
= build_function_type_list (void_type_node
, NULL_TREE
);
934 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
935 get_identifier ("__stack_chk_fail_local"), t
);
938 DECL_EXTERNAL (t
) = 1;
940 TREE_THIS_VOLATILE (t
) = 1;
941 TREE_NOTHROW (t
) = 1;
942 DECL_ARTIFICIAL (t
) = 1;
943 DECL_IGNORED_P (t
) = 1;
944 DECL_VISIBILITY_SPECIFIED (t
) = 1;
945 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
947 stack_chk_fail_decl
= t
;
950 return build_call_expr (t
, 0);
955 hook_bool_const_rtx_commutative_p (const_rtx x
,
956 int outer_code ATTRIBUTE_UNUSED
)
958 return COMMUTATIVE_P (x
);
962 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
963 const_tree fn_decl_or_type
,
964 bool outgoing ATTRIBUTE_UNUSED
)
966 /* The old interface doesn't handle receiving the function type. */
968 && !DECL_P (fn_decl_or_type
))
969 fn_decl_or_type
= NULL
;
971 #ifdef FUNCTION_VALUE
972 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
979 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
980 const_rtx fun ATTRIBUTE_UNUSED
)
983 return LIBCALL_VALUE (MACRO_MODE (mode
));
989 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
992 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
994 #ifdef FUNCTION_VALUE_REGNO_P
995 return FUNCTION_VALUE_REGNO_P (regno
);
1002 default_internal_arg_pointer (void)
1004 /* If the reg that the virtual arg pointer will be translated into is
1005 not a fixed reg or is the stack pointer, make a copy of the virtual
1006 arg pointer, and address parms via the copy. The frame pointer is
1007 considered fixed even though it is not marked as such. */
1008 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
1009 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
1010 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
1011 return copy_to_reg (virtual_incoming_args_rtx
);
1013 return virtual_incoming_args_rtx
;
1017 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
1021 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1022 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
1026 #ifdef STATIC_CHAIN_REGNUM
1027 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
1031 static bool issued_error
;
1034 issued_error
= true;
1035 sorry ("nested functions not supported on this target");
1038 /* It really doesn't matter what we return here, so long at it
1039 doesn't cause the rest of the compiler to crash. */
1040 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
1045 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
1046 rtx
ARG_UNUSED (r_chain
))
1048 sorry ("nested function trampolines not supported on this target");
1052 default_return_pops_args (tree
, tree
, poly_int64
)
1058 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
1060 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1066 default_lra_p (void)
1072 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1078 default_register_usage_leveling_p (void)
1084 default_different_addr_displacement_p (void)
1090 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1091 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1092 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1093 secondary_reload_info
*sri
)
1095 enum reg_class rclass
= NO_REGS
;
1096 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1098 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1100 sri
->icode
= sri
->prev_sri
->t_icode
;
1103 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1105 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
,
1106 MACRO_MODE (reload_mode
), x
);
1108 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1110 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
,
1111 MACRO_MODE (reload_mode
), x
);
1113 if (rclass
!= NO_REGS
)
1115 enum insn_code icode
1116 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1119 if (icode
!= CODE_FOR_nothing
1120 && !insn_operand_matches (icode
, in_p
, x
))
1121 icode
= CODE_FOR_nothing
;
1122 else if (icode
!= CODE_FOR_nothing
)
1124 const char *insn_constraint
, *scratch_constraint
;
1125 enum reg_class insn_class
, scratch_class
;
1127 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1128 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1129 if (!*insn_constraint
)
1130 insn_class
= ALL_REGS
;
1135 gcc_assert (*insn_constraint
== '=');
1138 insn_class
= (reg_class_for_constraint
1139 (lookup_constraint (insn_constraint
)));
1140 gcc_assert (insn_class
!= NO_REGS
);
1143 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1144 /* The scratch register's constraint must start with "=&",
1145 except for an input reload, where only "=" is necessary,
1146 and where it might be beneficial to re-use registers from
1148 gcc_assert (scratch_constraint
[0] == '='
1149 && (in_p
|| scratch_constraint
[1] == '&'));
1150 scratch_constraint
++;
1151 if (*scratch_constraint
== '&')
1152 scratch_constraint
++;
1153 scratch_class
= (reg_class_for_constraint
1154 (lookup_constraint (scratch_constraint
)));
1156 if (reg_class_subset_p (reload_class
, insn_class
))
1158 gcc_assert (scratch_class
== rclass
);
1162 rclass
= insn_class
;
1165 if (rclass
== NO_REGS
)
1168 sri
->t_icode
= icode
;
1173 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE. */
1176 default_secondary_memory_needed_mode (machine_mode mode
)
1178 if (!targetm
.lra_p ()
1179 && known_lt (GET_MODE_BITSIZE (mode
), BITS_PER_WORD
)
1180 && INTEGRAL_MODE_P (mode
))
1181 return mode_for_size (BITS_PER_WORD
, GET_MODE_CLASS (mode
), 0).require ();
1185 /* By default, if flag_pic is true, then neither local nor global relocs
1186 should be placed in readonly memory. */
1189 default_reloc_rw_mask (void)
1191 return flag_pic
? 3 : 0;
1194 /* By default, address diff vectors are generated
1195 for jump tables when flag_pic is true. */
1198 default_generate_pic_addr_diff_vec (void)
1203 /* By default, do no modification. */
1204 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1210 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT. */
1213 default_static_rtx_alignment (machine_mode mode
)
1215 return GET_MODE_ALIGNMENT (mode
);
1218 /* The default implementation of TARGET_CONSTANT_ALIGNMENT. */
1221 default_constant_alignment (const_tree
, HOST_WIDE_INT align
)
1226 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1227 to at least BITS_PER_WORD but otherwise makes no changes. */
1230 constant_alignment_word_strings (const_tree exp
, HOST_WIDE_INT align
)
1232 if (TREE_CODE (exp
) == STRING_CST
)
1233 return MAX (align
, BITS_PER_WORD
);
1237 /* Default to natural alignment for vector types, bounded by
1238 MAX_OFILE_ALIGNMENT. */
1241 default_vector_alignment (const_tree type
)
1243 unsigned HOST_WIDE_INT align
= MAX_OFILE_ALIGNMENT
;
1244 tree size
= TYPE_SIZE (type
);
1245 if (tree_fits_uhwi_p (size
))
1246 align
= tree_to_uhwi (size
);
1248 return align
< MAX_OFILE_ALIGNMENT
? align
: MAX_OFILE_ALIGNMENT
;
1251 /* The default implementation of
1252 TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT. */
1255 default_preferred_vector_alignment (const_tree type
)
1257 return TYPE_ALIGN (type
);
1260 /* By default assume vectors of element TYPE require a multiple of the natural
1261 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1263 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1268 /* By default, assume that a target supports any factor of misalignment
1269 memory access if it supports movmisalign patten.
1270 is_packed is true if the memory access is defined in a packed struct. */
1272 default_builtin_support_vector_misalignment (machine_mode mode
,
1280 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1285 /* By default, only attempt to parallelize bitwise operations, and
1286 possibly adds/subtracts using bit-twiddling. */
1289 default_preferred_simd_mode (scalar_mode
)
1294 /* By default do not split reductions further. */
1297 default_split_reduction (machine_mode mode
)
1302 /* By default only the size derived from the preferred vector mode
1306 default_autovectorize_vector_sizes (vector_sizes
*, bool)
1310 /* By default a vector of integers is used as a mask. */
1313 default_get_mask_mode (poly_uint64 nunits
, poly_uint64 vector_size
)
1315 unsigned int elem_size
= vector_element_size (vector_size
, nunits
);
1316 scalar_int_mode elem_mode
1317 = smallest_int_mode_for_size (elem_size
* BITS_PER_UNIT
);
1318 machine_mode vector_mode
;
1320 gcc_assert (known_eq (elem_size
* nunits
, vector_size
));
1322 if (mode_for_vector (elem_mode
, nunits
).exists (&vector_mode
)
1323 && VECTOR_MODE_P (vector_mode
)
1324 && targetm
.vector_mode_supported_p (vector_mode
))
1327 return opt_machine_mode ();
1330 /* By default consider masked stores to be expensive. */
1333 default_empty_mask_is_expensive (unsigned ifn
)
1335 return ifn
== IFN_MASK_STORE
;
1338 /* By default, the cost model accumulates three separate costs (prologue,
1339 loop body, and epilogue) for a vectorized loop or block. So allocate an
1340 array of three unsigned ints, set it to zero, and return its address. */
1343 default_init_cost (class loop
*loop_info ATTRIBUTE_UNUSED
)
1345 unsigned *cost
= XNEWVEC (unsigned, 3);
1346 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1350 /* By default, the cost model looks up the cost of the given statement
1351 kind and mode, multiplies it by the occurrence count, accumulates
1352 it into the cost specified by WHERE, and returns the cost added. */
1355 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1356 class _stmt_vec_info
*stmt_info
, int misalign
,
1357 enum vect_cost_model_location where
)
1359 unsigned *cost
= (unsigned *) data
;
1360 unsigned retval
= 0;
1362 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1363 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1365 /* Statements in an inner loop relative to the loop being
1366 vectorized are weighted more heavily. The value here is
1367 arbitrary and could potentially be improved with analysis. */
1368 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1369 count
*= 50; /* FIXME. */
1371 retval
= (unsigned) (count
* stmt_cost
);
1372 cost
[where
] += retval
;
1377 /* By default, the cost model just returns the accumulated costs. */
1380 default_finish_cost (void *data
, unsigned *prologue_cost
,
1381 unsigned *body_cost
, unsigned *epilogue_cost
)
1383 unsigned *cost
= (unsigned *) data
;
1384 *prologue_cost
= cost
[vect_prologue
];
1385 *body_cost
= cost
[vect_body
];
1386 *epilogue_cost
= cost
[vect_epilogue
];
1389 /* Free the cost data. */
1392 default_destroy_cost_data (void *data
)
1397 /* Determine whether or not a pointer mode is valid. Assume defaults
1398 of ptr_mode or Pmode - can be overridden. */
1400 default_valid_pointer_mode (scalar_int_mode mode
)
1402 return (mode
== ptr_mode
|| mode
== Pmode
);
1405 /* Determine whether the memory reference specified by REF may alias
1406 the C libraries errno location. */
1408 default_ref_may_alias_errno (ao_ref
*ref
)
1410 tree base
= ao_ref_base (ref
);
1411 /* The default implementation assumes the errno location is
1412 a declaration of type int or is always accessed via a
1413 pointer to int. We assume that accesses to errno are
1414 not deliberately obfuscated (even in conforming ways). */
1415 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1416 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1418 /* The default implementation assumes an errno location
1419 declaration is never defined in the current compilation unit. */
1421 && !TREE_STATIC (base
))
1423 else if (TREE_CODE (base
) == MEM_REF
1424 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1426 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1427 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1432 /* Return the mode for a pointer to a given ADDRSPACE,
1433 defaulting to ptr_mode for all address spaces. */
1436 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1441 /* Return the mode for an address in a given ADDRSPACE,
1442 defaulting to Pmode for all address spaces. */
1445 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1450 /* Named address space version of valid_pointer_mode.
1451 To match the above, the same modes apply to all address spaces. */
1454 default_addr_space_valid_pointer_mode (scalar_int_mode mode
,
1455 addr_space_t as ATTRIBUTE_UNUSED
)
1457 return targetm
.valid_pointer_mode (mode
);
1460 /* Some places still assume that all pointer or address modes are the
1461 standard Pmode and ptr_mode. These optimizations become invalid if
1462 the target actually supports multiple different modes. For now,
1463 we disable such optimizations on such targets, using this function. */
1466 target_default_pointer_address_modes_p (void)
1468 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1470 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1476 /* Named address space version of legitimate_address_p.
1477 By default, all address spaces have the same form. */
1480 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1482 addr_space_t as ATTRIBUTE_UNUSED
)
1484 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1487 /* Named address space version of LEGITIMIZE_ADDRESS.
1488 By default, all address spaces have the same form. */
1491 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1492 addr_space_t as ATTRIBUTE_UNUSED
)
1494 return targetm
.legitimize_address (x
, oldx
, mode
);
1497 /* The default hook for determining if one named address space is a subset of
1498 another and to return which address space to use as the common address
1502 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1504 return (subset
== superset
);
1507 /* The default hook for determining if 0 within a named address
1508 space is a valid address. */
1511 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1516 /* The default hook for debugging the address space is to return the
1517 address space number to indicate DW_AT_address_class. */
1519 default_addr_space_debug (addr_space_t as
)
1524 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1525 Don't complain about any address space. */
1528 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1533 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1534 called for targets with only a generic address space. */
1537 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1538 tree from_type ATTRIBUTE_UNUSED
,
1539 tree to_type ATTRIBUTE_UNUSED
)
1544 /* The defualt implementation of TARGET_HARD_REGNO_NREGS. */
1547 default_hard_regno_nregs (unsigned int, machine_mode mode
)
1549 /* Targets with variable-sized modes must provide their own definition
1551 return CEIL (GET_MODE_SIZE (mode
).to_constant (), UNITS_PER_WORD
);
1555 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1560 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1563 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1564 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1570 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1571 tree
ARG_UNUSED (name
),
1572 tree
ARG_UNUSED (args
),
1573 int ARG_UNUSED (flags
))
1575 warning (OPT_Wattributes
,
1576 "target attribute is not supported on this machine");
1582 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1583 tree
ARG_UNUSED (pop_target
))
1585 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1586 emit no warning because "#pragma GCC pop_target" is valid on targets that
1587 do not have the "target" pragma. */
1589 warning (OPT_Wpragmas
,
1590 "%<#pragma GCC target%> is not supported for this machine");
1596 default_target_can_inline_p (tree caller
, tree callee
)
1598 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1599 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1601 callee_opts
= target_option_default_node
;
1603 caller_opts
= target_option_default_node
;
1605 /* If both caller and callee have attributes, assume that if the
1606 pointer is different, the two functions have different target
1607 options since build_target_option_node uses a hash table for the
1609 return callee_opts
== caller_opts
;
1612 /* If the machine does not have a case insn that compares the bounds,
1613 this means extra overhead for dispatch tables, which raises the
1614 threshold for using them. */
1617 default_case_values_threshold (void)
1619 return (targetm
.have_casesi () ? 4 : 5);
1623 default_have_conditional_execution (void)
1625 return HAVE_conditional_execution
;
1628 /* By default we assume that c99 functions are present at the runtime,
1629 but sincos is not. */
1631 default_libc_has_function (enum function_class fn_class
)
1633 if (fn_class
== function_c94
1634 || fn_class
== function_c99_misc
1635 || fn_class
== function_c99_math_complex
)
1641 /* By default assume that libc has not a fast implementation. */
1644 default_libc_has_fast_function (int fcode ATTRIBUTE_UNUSED
)
1650 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1656 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1662 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1667 /* Compute cost of moving registers to/from memory. */
1670 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1671 reg_class_t rclass ATTRIBUTE_UNUSED
,
1672 bool in ATTRIBUTE_UNUSED
)
1674 #ifndef MEMORY_MOVE_COST
1675 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1677 return MEMORY_MOVE_COST (MACRO_MODE (mode
), (enum reg_class
) rclass
, in
);
1681 /* Compute cost of moving data from a register of class FROM to one of
1685 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1686 reg_class_t from ATTRIBUTE_UNUSED
,
1687 reg_class_t to ATTRIBUTE_UNUSED
)
1689 #ifndef REGISTER_MOVE_COST
1692 return REGISTER_MOVE_COST (MACRO_MODE (mode
),
1693 (enum reg_class
) from
, (enum reg_class
) to
);
1697 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS. */
1700 default_slow_unaligned_access (machine_mode
, unsigned int)
1702 return STRICT_ALIGNMENT
;
1705 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE. */
1708 default_estimated_poly_value (poly_int64 x
)
1713 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1714 behavior. SPEED_P is true if we are compiling for speed. */
1717 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1719 unsigned int move_ratio
;
1721 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1723 #if defined (HAVE_cpymemqi) || defined (HAVE_cpymemhi) || defined (HAVE_cpymemsi) || defined (HAVE_cpymemdi) || defined (HAVE_cpymemti)
1725 #else /* No cpymem patterns, pick a default. */
1726 move_ratio
= ((speed_p
) ? 15 : 3);
1732 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1733 used; return FALSE if the cpymem/setmem optab should be expanded, or
1734 a call to memcpy emitted. */
1737 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1738 unsigned int alignment
,
1739 enum by_pieces_operation op
,
1742 unsigned int max_size
= 0;
1743 unsigned int ratio
= 0;
1747 case CLEAR_BY_PIECES
:
1748 max_size
= STORE_MAX_PIECES
;
1749 ratio
= CLEAR_RATIO (speed_p
);
1751 case MOVE_BY_PIECES
:
1752 max_size
= MOVE_MAX_PIECES
;
1753 ratio
= get_move_ratio (speed_p
);
1756 max_size
= STORE_MAX_PIECES
;
1757 ratio
= SET_RATIO (speed_p
);
1759 case STORE_BY_PIECES
:
1760 max_size
= STORE_MAX_PIECES
;
1761 ratio
= get_move_ratio (speed_p
);
1763 case COMPARE_BY_PIECES
:
1764 max_size
= COMPARE_MAX_PIECES
;
1765 /* Pick a likely default, just as in get_move_ratio. */
1766 ratio
= speed_p
? 15 : 3;
1770 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1773 /* This hook controls code generation for expanding a memcmp operation by
1774 pieces. Return 1 for the normal pattern of compare/jump after each pair
1775 of loads, or a higher number to reduce the number of branches. */
1778 default_compare_by_pieces_branch_ratio (machine_mode
)
1783 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1784 entry. If RECORD_P is true and the target supports named sections,
1785 the location of the NOPs will be recorded in a special object section
1786 called "__patchable_function_entries". This routine may be called
1787 twice per function to put NOPs before and after the function
1791 default_print_patchable_function_entry (FILE *file
,
1792 unsigned HOST_WIDE_INT patch_area_size
,
1795 const char *nop_templ
= 0;
1797 rtx_insn
*my_nop
= make_insn_raw (gen_nop ());
1799 /* We use the template alone, relying on the (currently sane) assumption
1800 that the NOP template does not have variable operands. */
1801 code_num
= recog_memoized (my_nop
);
1802 nop_templ
= get_insn_template (code_num
, my_nop
);
1804 if (record_p
&& targetm_common
.have_named_sections
)
1807 static int patch_area_number
;
1808 section
*previous_section
= in_section
;
1809 const char *asm_op
= integer_asm_op (POINTER_SIZE_UNITS
, false);
1811 gcc_assert (asm_op
!= NULL
);
1812 patch_area_number
++;
1813 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE", patch_area_number
);
1815 switch_to_section (get_section ("__patchable_function_entries",
1816 SECTION_WRITE
| SECTION_RELRO
, NULL
));
1817 fputs (asm_op
, file
);
1818 assemble_name_raw (file
, buf
);
1821 switch_to_section (previous_section
);
1822 ASM_OUTPUT_LABEL (file
, buf
);
1826 for (i
= 0; i
< patch_area_size
; ++i
)
1827 fprintf (file
, "\t%s\n", nop_templ
);
1831 default_profile_before_prologue (void)
1833 #ifdef PROFILE_BEFORE_PROLOGUE
1840 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1843 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1846 #ifdef PREFERRED_RELOAD_CLASS
1847 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1853 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1856 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1862 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1864 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1869 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1872 default_class_likely_spilled_p (reg_class_t rclass
)
1874 return (reg_class_size
[(int) rclass
] == 1);
1877 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1880 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1881 machine_mode mode ATTRIBUTE_UNUSED
)
1883 #ifdef CLASS_MAX_NREGS
1884 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
,
1887 /* Targets with variable-sized modes must provide their own definition
1889 unsigned int size
= GET_MODE_SIZE (mode
).to_constant ();
1890 return (size
+ UNITS_PER_WORD
- 1) / UNITS_PER_WORD
;
1894 /* Determine the debugging unwind mechanism for the target. */
1896 enum unwind_info_type
1897 default_debug_unwind_info (void)
1899 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1900 /* ??? Change all users to the hook, then poison this. */
1901 #ifdef DWARF2_FRAME_INFO
1902 if (DWARF2_FRAME_INFO
)
1906 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1907 #ifdef DWARF2_DEBUGGING_INFO
1908 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1915 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
1916 must define this hook. */
1919 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
1924 /* Determine the correct mode for a Dwarf frame register that represents
1928 default_dwarf_frame_reg_mode (int regno
)
1930 machine_mode save_mode
= reg_raw_mode
[regno
];
1932 if (targetm
.hard_regno_call_part_clobbered (eh_edge_abi
.id (),
1934 save_mode
= choose_hard_reg_mode (regno
, 1, &eh_edge_abi
);
1938 /* To be used by targets where reg_raw_mode doesn't return the right
1939 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1942 default_get_reg_raw_mode (int regno
)
1944 /* Targets must override this hook if the underlying register is
1946 return as_a
<fixed_size_mode
> (reg_raw_mode
[regno
]);
1949 /* Return true if a leaf function should stay leaf even with profiling
1953 default_keep_leaf_when_profiled ()
1958 /* Return true if the state of option OPTION should be stored in PCH files
1959 and checked by default_pch_valid_p. Store the option's current state
1963 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1965 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1967 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1969 if (option_flag_var (option
, &global_options
) == &target_flags
)
1970 if (targetm
.check_pch_target_flags
)
1972 return get_option_state (&global_options
, option
, state
);
1975 /* Default version of get_pch_validity.
1976 By default, every flag difference is fatal; that will be mostly right for
1977 most targets, but completely right for very few. */
1980 default_get_pch_validity (size_t *sz
)
1982 struct cl_option_state state
;
1987 if (targetm
.check_pch_target_flags
)
1988 *sz
+= sizeof (target_flags
);
1989 for (i
= 0; i
< cl_options_count
; i
++)
1990 if (option_affects_pch_p (i
, &state
))
1993 result
= r
= XNEWVEC (char, *sz
);
1997 if (targetm
.check_pch_target_flags
)
1999 memcpy (r
, &target_flags
, sizeof (target_flags
));
2000 r
+= sizeof (target_flags
);
2003 for (i
= 0; i
< cl_options_count
; i
++)
2004 if (option_affects_pch_p (i
, &state
))
2006 memcpy (r
, state
.data
, state
.size
);
2013 /* Return a message which says that a PCH file was created with a different
2014 setting of OPTION. */
2017 pch_option_mismatch (const char *option
)
2019 return xasprintf (_("created and used with differing settings of '%s'"),
2023 /* Default version of pch_valid_p. */
2026 default_pch_valid_p (const void *data_p
, size_t len
)
2028 struct cl_option_state state
;
2029 const char *data
= (const char *)data_p
;
2032 /* -fpic and -fpie also usually make a PCH invalid. */
2033 if (data
[0] != flag_pic
)
2034 return _("created and used with different settings of %<-fpic%>");
2035 if (data
[1] != flag_pie
)
2036 return _("created and used with different settings of %<-fpie%>");
2039 /* Check target_flags. */
2040 if (targetm
.check_pch_target_flags
)
2045 memcpy (&tf
, data
, sizeof (target_flags
));
2046 data
+= sizeof (target_flags
);
2047 len
-= sizeof (target_flags
);
2048 r
= targetm
.check_pch_target_flags (tf
);
2053 for (i
= 0; i
< cl_options_count
; i
++)
2054 if (option_affects_pch_p (i
, &state
))
2056 if (memcmp (data
, state
.data
, state
.size
) != 0)
2057 return pch_option_mismatch (cl_options
[i
].opt_text
);
2065 /* Default version of cstore_mode. */
2068 default_cstore_mode (enum insn_code icode
)
2070 return as_a
<scalar_int_mode
> (insn_data
[(int) icode
].operand
[0].mode
);
2073 /* Default version of member_type_forces_blk. */
2076 default_member_type_forces_blk (const_tree
, machine_mode
)
2082 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
2083 rtx ptr ATTRIBUTE_UNUSED
,
2084 rtx bnd ATTRIBUTE_UNUSED
)
2090 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
2091 rtx addr ATTRIBUTE_UNUSED
,
2092 rtx bounds ATTRIBUTE_UNUSED
,
2093 rtx to ATTRIBUTE_UNUSED
)
2099 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
2105 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
2106 rtx bounds ATTRIBUTE_UNUSED
)
2111 /* Default version of canonicalize_comparison. */
2114 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
2118 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
2121 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
2125 #ifndef PAD_VARARGS_DOWN
2126 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2129 /* Build an indirect-ref expression over the given TREE, which represents a
2130 piece of a va_arg() expansion. */
2132 build_va_arg_indirect_ref (tree addr
)
2134 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
2138 /* The "standard" implementation of va_arg: read the value from the
2139 current (padded) address and increment by the (padded) size. */
2142 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
2145 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
2146 unsigned HOST_WIDE_INT align
, boundary
;
2149 /* All of the alignment and movement below is for args-grow-up machines.
2150 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2151 implement their own specialized gimplify_va_arg_expr routines. */
2152 if (ARGS_GROW_DOWNWARD
)
2155 indirect
= pass_va_arg_by_reference (type
);
2157 type
= build_pointer_type (type
);
2159 if (targetm
.calls
.split_complex_arg
2160 && TREE_CODE (type
) == COMPLEX_TYPE
2161 && targetm
.calls
.split_complex_arg (type
))
2163 tree real_part
, imag_part
;
2165 real_part
= std_gimplify_va_arg_expr (valist
,
2166 TREE_TYPE (type
), pre_p
, NULL
);
2167 real_part
= get_initialized_tmp_var (real_part
, pre_p
, NULL
);
2169 imag_part
= std_gimplify_va_arg_expr (unshare_expr (valist
),
2170 TREE_TYPE (type
), pre_p
, NULL
);
2171 imag_part
= get_initialized_tmp_var (imag_part
, pre_p
, NULL
);
2173 return build2 (COMPLEX_EXPR
, type
, real_part
, imag_part
);
2176 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2177 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
2179 /* When we align parameter on stack for caller, if the parameter
2180 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2181 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
2182 here with caller. */
2183 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
2184 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
2186 boundary
/= BITS_PER_UNIT
;
2188 /* Hoist the valist value into a temporary for the moment. */
2189 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
2191 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
2192 requires greater alignment, we must perform dynamic alignment. */
2193 if (boundary
> align
2194 && !TYPE_EMPTY_P (type
)
2195 && !integer_zerop (TYPE_SIZE (type
)))
2197 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2198 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
2199 gimplify_and_add (t
, pre_p
);
2201 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2202 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
2204 build_int_cst (TREE_TYPE (valist
), -boundary
)));
2205 gimplify_and_add (t
, pre_p
);
2210 /* If the actual alignment is less than the alignment of the type,
2211 adjust the type accordingly so that we don't assume strict alignment
2212 when dereferencing the pointer. */
2213 boundary
*= BITS_PER_UNIT
;
2214 if (boundary
< TYPE_ALIGN (type
))
2216 type
= build_variant_type_copy (type
);
2217 SET_TYPE_ALIGN (type
, boundary
);
2220 /* Compute the rounded size of the type. */
2221 type_size
= arg_size_in_bytes (type
);
2222 rounded_size
= round_up (type_size
, align
);
2224 /* Reduce rounded_size so it's sharable with the postqueue. */
2225 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2229 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2231 /* Small args are padded downward. */
2232 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2233 rounded_size
, size_int (align
));
2234 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2235 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2236 addr
= fold_build_pointer_plus (addr
, t
);
2239 /* Compute new value for AP. */
2240 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2241 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2242 gimplify_and_add (t
, pre_p
);
2244 addr
= fold_convert (build_pointer_type (type
), addr
);
2247 addr
= build_va_arg_indirect_ref (addr
);
2249 return build_va_arg_indirect_ref (addr
);
2252 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2253 not support nested low-overhead loops. */
2256 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2257 unsigned int loop_depth
, bool)
2259 return loop_depth
== 1;
2262 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2265 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2270 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2273 default_max_noce_ifcvt_seq_cost (edge e
)
2275 bool predictable_p
= predictable_edge_p (e
);
2277 enum compiler_param param
2279 ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2280 : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST
);
2282 /* If we have a parameter set, use that, otherwise take a guess using
2284 if (global_options_set
.x_param_values
[param
])
2285 return PARAM_VALUE (param
);
2287 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2290 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2293 default_min_arithmetic_precision (void)
2295 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2298 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2300 enum flt_eval_method
2301 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2303 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2306 /* Default implementation for
2307 TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE. */
2309 default_stack_clash_protection_alloca_probe_range (void)
2314 /* The default implementation of TARGET_EARLY_REMAT_MODES. */
2317 default_select_early_remat_modes (sbitmap
)
2321 /* The default implementation of TARGET_PREFERRED_ELSE_VALUE. */
2324 default_preferred_else_value (unsigned, tree type
, unsigned, tree
*)
2326 return build_zero_cst (type
);
2329 /* Default implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE. */
2331 default_have_speculation_safe_value (bool active ATTRIBUTE_UNUSED
)
2333 #ifdef HAVE_speculation_barrier
2334 return active
? HAVE_speculation_barrier
: true;
2339 /* Alternative implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE
2340 that can be used on targets that never have speculative execution. */
2342 speculation_safe_value_not_needed (bool active
)
2347 /* Default implementation of the speculation-safe-load builtin. This
2348 implementation simply copies val to result and generates a
2349 speculation_barrier insn, if such a pattern is defined. */
2351 default_speculation_safe_value (machine_mode mode ATTRIBUTE_UNUSED
,
2352 rtx result
, rtx val
,
2353 rtx failval ATTRIBUTE_UNUSED
)
2355 emit_move_insn (result
, val
);
2357 #ifdef HAVE_speculation_barrier
2358 /* Assume the target knows what it is doing: if it defines a
2359 speculation barrier, but it is not enabled, then assume that one
2361 if (HAVE_speculation_barrier
)
2362 emit_insn (gen_speculation_barrier ());
2368 #include "gt-targhooks.h"