1 /* Default target hook functions.
2 Copyright (C) 2003-2019 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* The migration of target macros to target hooks works as follows:
22 1. Create a target hook that uses the existing target macros to
23 implement the same functionality.
25 2. Convert all the MI files to use the hook instead of the macro.
27 3. Repeat for a majority of the remaining target macros. This will
30 4. Tell target maintainers to start migrating.
32 5. Eventually convert the backends to override the hook instead of
33 defining the macros. This will take some time too.
35 6. TBD when, poison the macros. Unmigrated targets will break at
38 Note that we expect steps 1-3 to be done by the people that
39 understand what the MI does with each macro, and step 5 to be done
40 by the target maintainers for their respective targets.
42 Note that steps 1 and 2 don't have to be done together, but no
43 target can override the new hook until step 2 is complete for it.
45 Once the macros are poisoned, we will revert to the old migration
46 rules - migrate the macro, callers, and targets all at once. This
47 comment can thus be removed at that point. */
51 #include "coretypes.h"
56 #include "tree-ssa-alias.h"
57 #include "gimple-expr.h"
60 #include "stringpool.h"
62 #include "tree-ssanames.h"
63 #include "profile-count.h"
67 #include "diagnostic-core.h"
68 #include "fold-const.h"
69 #include "stor-layout.h"
76 #include "common/common-target.h"
84 #include "langhooks.h"
88 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
89 rtx addr ATTRIBUTE_UNUSED
,
90 bool strict ATTRIBUTE_UNUSED
)
92 #ifdef GO_IF_LEGITIMATE_ADDRESS
93 /* Defer to the old implementation using a goto. */
95 return strict_memory_address_p (mode
, addr
);
97 return memory_address_p (mode
, addr
);
104 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
106 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
107 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
112 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
116 /* Any floating arithmetic may trap. */
117 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
120 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
122 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
130 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
132 int *punsignedp ATTRIBUTE_UNUSED
,
133 const_tree funtype ATTRIBUTE_UNUSED
,
134 int for_return ATTRIBUTE_UNUSED
)
136 if (type
!= NULL_TREE
&& for_return
== 2)
137 return promote_mode (type
, mode
, punsignedp
);
142 default_promote_function_mode_always_promote (const_tree type
,
145 const_tree funtype ATTRIBUTE_UNUSED
,
146 int for_return ATTRIBUTE_UNUSED
)
148 return promote_mode (type
, mode
, punsignedp
);
152 default_cc_modes_compatible (machine_mode m1
, machine_mode m2
)
160 default_return_in_memory (const_tree type
,
161 const_tree fntype ATTRIBUTE_UNUSED
)
163 return (TYPE_MODE (type
) == BLKmode
);
167 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
168 machine_mode mode ATTRIBUTE_UNUSED
)
174 default_legitimize_address_displacement (rtx
*, rtx
*, poly_int64
,
181 default_const_not_ok_for_debug_p (rtx x
)
183 if (GET_CODE (x
) == UNSPEC
)
189 default_expand_builtin_saveregs (void)
191 error ("%<__builtin_saveregs%> not supported by this target");
196 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED
,
197 machine_mode mode ATTRIBUTE_UNUSED
,
198 tree type ATTRIBUTE_UNUSED
,
199 int *pretend_arg_size ATTRIBUTE_UNUSED
,
200 int second_time ATTRIBUTE_UNUSED
)
204 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
207 default_builtin_setjmp_frame_value (void)
209 return virtual_stack_vars_rtx
;
212 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
215 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
221 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
223 return (targetm
.calls
.setup_incoming_varargs
224 != default_setup_incoming_varargs
);
228 default_eh_return_filter_mode (void)
230 return targetm
.unwind_word_mode ();
234 default_libgcc_cmp_return_mode (void)
240 default_libgcc_shift_count_mode (void)
246 default_unwind_word_mode (void)
251 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
253 unsigned HOST_WIDE_INT
254 default_shift_truncation_mask (machine_mode mode
)
256 return SHIFT_COUNT_TRUNCATED
? GET_MODE_UNIT_BITSIZE (mode
) - 1 : 0;
259 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
262 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED
)
264 return have_insn_for (DIV
, mode
) ? 3 : 2;
267 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
270 default_mode_rep_extended (scalar_int_mode
, scalar_int_mode
)
275 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
278 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
283 /* Return machine mode for non-standard suffix
284 or VOIDmode if non-standard suffixes are unsupported. */
286 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
291 /* The generic C++ ABI specifies this is a 64-bit value. */
293 default_cxx_guard_type (void)
295 return long_long_integer_type_node
;
298 /* Returns the size of the cookie to use when allocating an array
299 whose elements have the indicated TYPE. Assumes that it is already
300 known that a cookie is needed. */
303 default_cxx_get_cookie_size (tree type
)
307 /* We need to allocate an additional max (sizeof (size_t), alignof
308 (true_type)) bytes. */
312 sizetype_size
= size_in_bytes (sizetype
);
313 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
314 if (tree_int_cst_lt (type_align
, sizetype_size
))
315 cookie_size
= sizetype_size
;
317 cookie_size
= type_align
;
322 /* Return true if a parameter must be passed by reference. This version
323 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
326 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t 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 /* The default implementation of TARGET_TRANSLATE_MODE_ATTRIBUTE. */
399 default_translate_mode_attribute (machine_mode mode
)
404 /* True if MODE is valid for the target. By "valid", we mean able to
405 be manipulated in non-trivial ways. In particular, this means all
406 the arithmetic is supported.
408 By default we guess this means that any C type is supported. If
409 we can't map the mode back to a type that would be available in C,
410 then reject it. Special case, here, is the double-word arithmetic
411 supported by optabs.c. */
414 default_scalar_mode_supported_p (scalar_mode mode
)
416 int precision
= GET_MODE_PRECISION (mode
);
418 switch (GET_MODE_CLASS (mode
))
420 case MODE_PARTIAL_INT
:
422 if (precision
== CHAR_TYPE_SIZE
)
424 if (precision
== SHORT_TYPE_SIZE
)
426 if (precision
== INT_TYPE_SIZE
)
428 if (precision
== LONG_TYPE_SIZE
)
430 if (precision
== LONG_LONG_TYPE_SIZE
)
432 if (precision
== 2 * BITS_PER_WORD
)
437 if (precision
== FLOAT_TYPE_SIZE
)
439 if (precision
== DOUBLE_TYPE_SIZE
)
441 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
445 case MODE_DECIMAL_FLOAT
:
457 /* Return true if libgcc supports floating-point mode MODE (known to
458 be supported as a scalar mode). */
461 default_libgcc_floating_mode_supported_p (scalar_float_mode mode
)
484 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
485 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
487 opt_scalar_float_mode
488 default_floatn_mode (int n
, bool extended
)
492 opt_scalar_float_mode cand1
, cand2
;
493 scalar_float_mode mode
;
515 /* Those are the only valid _FloatNx types. */
518 if (cand1
.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
))
523 if (cand2
.exists (&mode
)
524 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
525 && targetm
.scalar_mode_supported_p (mode
)
526 && targetm
.libgcc_floating_mode_supported_p (mode
))
531 opt_scalar_float_mode cand
;
532 scalar_float_mode mode
;
536 /* Always enable _Float16 if we have basic support for the mode.
537 Targets can control the range and precision of operations on
538 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
565 if (cand
.exists (&mode
)
566 && REAL_MODE_FORMAT (mode
)->ieee_bits
== n
567 && targetm
.scalar_mode_supported_p (mode
)
568 && targetm
.libgcc_floating_mode_supported_p (mode
))
571 return opt_scalar_float_mode ();
574 /* Define this to return true if the _Floatn and _Floatnx built-in functions
575 should implicitly enable the built-in function without the __builtin_ prefix
576 in addition to the normal built-in function with the __builtin_ prefix. The
577 default is to only enable built-in functions without the __builtin_ prefix
578 for the GNU C langauge. The argument FUNC is the enum builtin_in_function
579 id of the function to be enabled. */
582 default_floatn_builtin_p (int func ATTRIBUTE_UNUSED
)
584 static bool first_time_p
= true;
585 static bool c_or_objective_c
;
589 first_time_p
= false;
590 c_or_objective_c
= lang_GNU_C () || lang_GNU_OBJC ();
593 return c_or_objective_c
;
596 /* Make some target macros useable by target-independent code. */
598 targhook_words_big_endian (void)
600 return !!WORDS_BIG_ENDIAN
;
604 targhook_float_words_big_endian (void)
606 return !!FLOAT_WORDS_BIG_ENDIAN
;
609 /* True if the target supports floating-point exceptions and rounding
613 default_float_exceptions_rounding_supported_p (void)
622 /* True if the target supports decimal floating point. */
625 default_decimal_float_supported_p (void)
627 return ENABLE_DECIMAL_FLOAT
;
630 /* True if the target supports fixed-point arithmetic. */
633 default_fixed_point_supported_p (void)
635 return ENABLE_FIXED_POINT
;
638 /* True if the target supports GNU indirect functions. */
641 default_has_ifunc_p (void)
643 return HAVE_GNU_INDIRECT_FUNCTION
;
646 /* Return true if we predict the loop LOOP will be transformed to a
647 low-overhead loop, otherwise return false.
649 By default, false is returned, as this hook's applicability should be
650 verified for each target. Target maintainers should re-define the hook
651 if the target can take advantage of it. */
654 default_predict_doloop_p (class loop
*loop ATTRIBUTE_UNUSED
)
659 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
662 This function checks whether a given INSN is valid within a low-overhead
663 loop. If INSN is invalid it returns the reason for that, otherwise it
664 returns NULL. A called function may clobber any special registers required
665 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
666 register for branch on table instructions. We reject the doloop pattern in
670 default_invalid_within_doloop (const rtx_insn
*insn
)
673 return "Function call in loop.";
675 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
676 return "Computed branch in the loop.";
681 /* Mapping of builtin functions to vectorized variants. */
684 default_builtin_vectorized_function (unsigned int, tree
, tree
)
689 /* Mapping of target builtin functions to vectorized variants. */
692 default_builtin_md_vectorized_function (tree
, tree
, tree
)
697 /* Vectorized conversion. */
700 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
701 tree dest_type ATTRIBUTE_UNUSED
,
702 tree src_type ATTRIBUTE_UNUSED
)
707 /* Default vectorizer cost model values. */
710 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
712 int misalign ATTRIBUTE_UNUSED
)
714 switch (type_of_cost
)
724 case cond_branch_not_taken
:
726 case vec_promote_demote
:
730 case unaligned_store
:
733 case cond_branch_taken
:
737 return estimated_poly_value (TYPE_VECTOR_SUBPARTS (vectype
)) - 1;
747 default_builtin_reciprocal (tree
)
753 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
754 cumulative_args_t ca ATTRIBUTE_UNUSED
,
755 machine_mode mode ATTRIBUTE_UNUSED
,
756 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
762 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
763 cumulative_args_t ca ATTRIBUTE_UNUSED
,
764 machine_mode mode ATTRIBUTE_UNUSED
,
765 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
771 hook_int_CUMULATIVE_ARGS_arg_info_0 (cumulative_args_t
,
772 const function_arg_info
&)
778 hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED
,
779 tree ATTRIBUTE_UNUSED
)
784 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
785 machine_mode mode ATTRIBUTE_UNUSED
,
786 const_tree type ATTRIBUTE_UNUSED
,
787 bool named ATTRIBUTE_UNUSED
)
792 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET. */
795 default_function_arg_offset (machine_mode
, const_tree
)
800 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
801 upward, but pad short args downward on big-endian machines. */
804 default_function_arg_padding (machine_mode mode
, const_tree type
)
806 if (!BYTES_BIG_ENDIAN
)
809 unsigned HOST_WIDE_INT size
;
812 if (!type
|| TREE_CODE (TYPE_SIZE (type
)) != INTEGER_CST
)
814 size
= int_size_in_bytes (type
);
817 /* Targets with variable-sized modes must override this hook
818 and handle variable-sized modes explicitly. */
819 size
= GET_MODE_SIZE (mode
).to_constant ();
821 if (size
< (PARM_BOUNDARY
/ BITS_PER_UNIT
))
828 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
829 machine_mode mode ATTRIBUTE_UNUSED
,
830 const_tree type ATTRIBUTE_UNUSED
,
831 bool named ATTRIBUTE_UNUSED
)
837 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
838 machine_mode mode ATTRIBUTE_UNUSED
,
839 const_tree type ATTRIBUTE_UNUSED
,
840 bool named ATTRIBUTE_UNUSED
)
846 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
847 const_tree type ATTRIBUTE_UNUSED
)
849 return PARM_BOUNDARY
;
853 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
854 const_tree type ATTRIBUTE_UNUSED
)
856 return PARM_BOUNDARY
;
860 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
865 hook_invalid_arg_for_unprototyped_fn (
866 const_tree typelist ATTRIBUTE_UNUSED
,
867 const_tree funcdecl ATTRIBUTE_UNUSED
,
868 const_tree val ATTRIBUTE_UNUSED
)
873 /* Initialize the stack protection decls. */
875 /* Stack protection related decls living in libgcc. */
876 static GTY(()) tree stack_chk_guard_decl
;
879 default_stack_protect_guard (void)
881 tree t
= stack_chk_guard_decl
;
887 t
= build_decl (UNKNOWN_LOCATION
,
888 VAR_DECL
, get_identifier ("__stack_chk_guard"),
892 DECL_EXTERNAL (t
) = 1;
894 TREE_THIS_VOLATILE (t
) = 1;
895 DECL_ARTIFICIAL (t
) = 1;
896 DECL_IGNORED_P (t
) = 1;
898 /* Do not share RTL as the declaration is visible outside of
901 RTX_FLAG (x
, used
) = 1;
903 stack_chk_guard_decl
= t
;
909 static GTY(()) tree stack_chk_fail_decl
;
912 default_external_stack_protect_fail (void)
914 tree t
= stack_chk_fail_decl
;
918 t
= build_function_type_list (void_type_node
, NULL_TREE
);
919 t
= build_decl (UNKNOWN_LOCATION
,
920 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
923 DECL_EXTERNAL (t
) = 1;
925 TREE_THIS_VOLATILE (t
) = 1;
926 TREE_NOTHROW (t
) = 1;
927 DECL_ARTIFICIAL (t
) = 1;
928 DECL_IGNORED_P (t
) = 1;
929 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
930 DECL_VISIBILITY_SPECIFIED (t
) = 1;
932 stack_chk_fail_decl
= t
;
935 return build_call_expr (t
, 0);
939 default_hidden_stack_protect_fail (void)
941 #ifndef HAVE_GAS_HIDDEN
942 return default_external_stack_protect_fail ();
944 tree t
= stack_chk_fail_decl
;
947 return default_external_stack_protect_fail ();
951 t
= build_function_type_list (void_type_node
, NULL_TREE
);
952 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
953 get_identifier ("__stack_chk_fail_local"), t
);
956 DECL_EXTERNAL (t
) = 1;
958 TREE_THIS_VOLATILE (t
) = 1;
959 TREE_NOTHROW (t
) = 1;
960 DECL_ARTIFICIAL (t
) = 1;
961 DECL_IGNORED_P (t
) = 1;
962 DECL_VISIBILITY_SPECIFIED (t
) = 1;
963 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
965 stack_chk_fail_decl
= t
;
968 return build_call_expr (t
, 0);
973 hook_bool_const_rtx_commutative_p (const_rtx x
,
974 int outer_code ATTRIBUTE_UNUSED
)
976 return COMMUTATIVE_P (x
);
980 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
981 const_tree fn_decl_or_type
,
982 bool outgoing ATTRIBUTE_UNUSED
)
984 /* The old interface doesn't handle receiving the function type. */
986 && !DECL_P (fn_decl_or_type
))
987 fn_decl_or_type
= NULL
;
989 #ifdef FUNCTION_VALUE
990 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
997 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
998 const_rtx fun ATTRIBUTE_UNUSED
)
1000 #ifdef LIBCALL_VALUE
1001 return LIBCALL_VALUE (MACRO_MODE (mode
));
1007 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
1010 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
1012 #ifdef FUNCTION_VALUE_REGNO_P
1013 return FUNCTION_VALUE_REGNO_P (regno
);
1020 default_internal_arg_pointer (void)
1022 /* If the reg that the virtual arg pointer will be translated into is
1023 not a fixed reg or is the stack pointer, make a copy of the virtual
1024 arg pointer, and address parms via the copy. The frame pointer is
1025 considered fixed even though it is not marked as such. */
1026 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
1027 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
1028 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
1029 return copy_to_reg (virtual_incoming_args_rtx
);
1031 return virtual_incoming_args_rtx
;
1035 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
1039 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1040 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
1044 #ifdef STATIC_CHAIN_REGNUM
1045 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
1049 static bool issued_error
;
1052 issued_error
= true;
1053 sorry ("nested functions not supported on this target");
1056 /* It really doesn't matter what we return here, so long at it
1057 doesn't cause the rest of the compiler to crash. */
1058 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
1063 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
1064 rtx
ARG_UNUSED (r_chain
))
1066 sorry ("nested function trampolines not supported on this target");
1070 default_return_pops_args (tree
, tree
, poly_int64
)
1076 default_branch_target_register_class (void)
1082 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
1084 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1090 default_lra_p (void)
1096 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1102 default_register_usage_leveling_p (void)
1108 default_different_addr_displacement_p (void)
1114 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1115 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1116 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1117 secondary_reload_info
*sri
)
1119 enum reg_class rclass
= NO_REGS
;
1120 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1122 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1124 sri
->icode
= sri
->prev_sri
->t_icode
;
1127 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1129 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
,
1130 MACRO_MODE (reload_mode
), x
);
1132 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1134 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
,
1135 MACRO_MODE (reload_mode
), x
);
1137 if (rclass
!= NO_REGS
)
1139 enum insn_code icode
1140 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1143 if (icode
!= CODE_FOR_nothing
1144 && !insn_operand_matches (icode
, in_p
, x
))
1145 icode
= CODE_FOR_nothing
;
1146 else if (icode
!= CODE_FOR_nothing
)
1148 const char *insn_constraint
, *scratch_constraint
;
1149 enum reg_class insn_class
, scratch_class
;
1151 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1152 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1153 if (!*insn_constraint
)
1154 insn_class
= ALL_REGS
;
1159 gcc_assert (*insn_constraint
== '=');
1162 insn_class
= (reg_class_for_constraint
1163 (lookup_constraint (insn_constraint
)));
1164 gcc_assert (insn_class
!= NO_REGS
);
1167 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1168 /* The scratch register's constraint must start with "=&",
1169 except for an input reload, where only "=" is necessary,
1170 and where it might be beneficial to re-use registers from
1172 gcc_assert (scratch_constraint
[0] == '='
1173 && (in_p
|| scratch_constraint
[1] == '&'));
1174 scratch_constraint
++;
1175 if (*scratch_constraint
== '&')
1176 scratch_constraint
++;
1177 scratch_class
= (reg_class_for_constraint
1178 (lookup_constraint (scratch_constraint
)));
1180 if (reg_class_subset_p (reload_class
, insn_class
))
1182 gcc_assert (scratch_class
== rclass
);
1186 rclass
= insn_class
;
1189 if (rclass
== NO_REGS
)
1192 sri
->t_icode
= icode
;
1197 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE. */
1200 default_secondary_memory_needed_mode (machine_mode mode
)
1202 if (!targetm
.lra_p ()
1203 && known_lt (GET_MODE_BITSIZE (mode
), BITS_PER_WORD
)
1204 && INTEGRAL_MODE_P (mode
))
1205 return mode_for_size (BITS_PER_WORD
, GET_MODE_CLASS (mode
), 0).require ();
1209 /* By default, if flag_pic is true, then neither local nor global relocs
1210 should be placed in readonly memory. */
1213 default_reloc_rw_mask (void)
1215 return flag_pic
? 3 : 0;
1218 /* By default, address diff vectors are generated
1219 for jump tables when flag_pic is true. */
1222 default_generate_pic_addr_diff_vec (void)
1227 /* By default, do no modification. */
1228 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1234 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT. */
1237 default_static_rtx_alignment (machine_mode mode
)
1239 return GET_MODE_ALIGNMENT (mode
);
1242 /* The default implementation of TARGET_CONSTANT_ALIGNMENT. */
1245 default_constant_alignment (const_tree
, HOST_WIDE_INT align
)
1250 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1251 to at least BITS_PER_WORD but otherwise makes no changes. */
1254 constant_alignment_word_strings (const_tree exp
, HOST_WIDE_INT align
)
1256 if (TREE_CODE (exp
) == STRING_CST
)
1257 return MAX (align
, BITS_PER_WORD
);
1261 /* Default to natural alignment for vector types, bounded by
1262 MAX_OFILE_ALIGNMENT. */
1265 default_vector_alignment (const_tree type
)
1267 unsigned HOST_WIDE_INT align
= MAX_OFILE_ALIGNMENT
;
1268 tree size
= TYPE_SIZE (type
);
1269 if (tree_fits_uhwi_p (size
))
1270 align
= tree_to_uhwi (size
);
1272 return align
< MAX_OFILE_ALIGNMENT
? align
: MAX_OFILE_ALIGNMENT
;
1275 /* The default implementation of
1276 TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT. */
1279 default_preferred_vector_alignment (const_tree type
)
1281 return TYPE_ALIGN (type
);
1284 /* By default assume vectors of element TYPE require a multiple of the natural
1285 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1287 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1292 /* By default, assume that a target supports any factor of misalignment
1293 memory access if it supports movmisalign patten.
1294 is_packed is true if the memory access is defined in a packed struct. */
1296 default_builtin_support_vector_misalignment (machine_mode mode
,
1304 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1309 /* By default, only attempt to parallelize bitwise operations, and
1310 possibly adds/subtracts using bit-twiddling. */
1313 default_preferred_simd_mode (scalar_mode
)
1318 /* By default do not split reductions further. */
1321 default_split_reduction (machine_mode mode
)
1326 /* By default only the size derived from the preferred vector mode
1330 default_autovectorize_vector_sizes (vector_sizes
*, bool)
1334 /* By default a vector of integers is used as a mask. */
1337 default_get_mask_mode (poly_uint64 nunits
, poly_uint64 vector_size
)
1339 unsigned int elem_size
= vector_element_size (vector_size
, nunits
);
1340 scalar_int_mode elem_mode
1341 = smallest_int_mode_for_size (elem_size
* BITS_PER_UNIT
);
1342 machine_mode vector_mode
;
1344 gcc_assert (known_eq (elem_size
* nunits
, vector_size
));
1346 if (mode_for_vector (elem_mode
, nunits
).exists (&vector_mode
)
1347 && VECTOR_MODE_P (vector_mode
)
1348 && targetm
.vector_mode_supported_p (vector_mode
))
1351 return opt_machine_mode ();
1354 /* By default consider masked stores to be expensive. */
1357 default_empty_mask_is_expensive (unsigned ifn
)
1359 return ifn
== IFN_MASK_STORE
;
1362 /* By default, the cost model accumulates three separate costs (prologue,
1363 loop body, and epilogue) for a vectorized loop or block. So allocate an
1364 array of three unsigned ints, set it to zero, and return its address. */
1367 default_init_cost (class loop
*loop_info ATTRIBUTE_UNUSED
)
1369 unsigned *cost
= XNEWVEC (unsigned, 3);
1370 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1374 /* By default, the cost model looks up the cost of the given statement
1375 kind and mode, multiplies it by the occurrence count, accumulates
1376 it into the cost specified by WHERE, and returns the cost added. */
1379 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1380 class _stmt_vec_info
*stmt_info
, int misalign
,
1381 enum vect_cost_model_location where
)
1383 unsigned *cost
= (unsigned *) data
;
1384 unsigned retval
= 0;
1386 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1387 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1389 /* Statements in an inner loop relative to the loop being
1390 vectorized are weighted more heavily. The value here is
1391 arbitrary and could potentially be improved with analysis. */
1392 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1393 count
*= 50; /* FIXME. */
1395 retval
= (unsigned) (count
* stmt_cost
);
1396 cost
[where
] += retval
;
1401 /* By default, the cost model just returns the accumulated costs. */
1404 default_finish_cost (void *data
, unsigned *prologue_cost
,
1405 unsigned *body_cost
, unsigned *epilogue_cost
)
1407 unsigned *cost
= (unsigned *) data
;
1408 *prologue_cost
= cost
[vect_prologue
];
1409 *body_cost
= cost
[vect_body
];
1410 *epilogue_cost
= cost
[vect_epilogue
];
1413 /* Free the cost data. */
1416 default_destroy_cost_data (void *data
)
1421 /* Determine whether or not a pointer mode is valid. Assume defaults
1422 of ptr_mode or Pmode - can be overridden. */
1424 default_valid_pointer_mode (scalar_int_mode mode
)
1426 return (mode
== ptr_mode
|| mode
== Pmode
);
1429 /* Determine whether the memory reference specified by REF may alias
1430 the C libraries errno location. */
1432 default_ref_may_alias_errno (ao_ref
*ref
)
1434 tree base
= ao_ref_base (ref
);
1435 /* The default implementation assumes the errno location is
1436 a declaration of type int or is always accessed via a
1437 pointer to int. We assume that accesses to errno are
1438 not deliberately obfuscated (even in conforming ways). */
1439 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1440 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1442 /* The default implementation assumes an errno location
1443 declaration is never defined in the current compilation unit. */
1445 && !TREE_STATIC (base
))
1447 else if (TREE_CODE (base
) == MEM_REF
1448 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1450 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1451 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1456 /* Return the mode for a pointer to a given ADDRSPACE,
1457 defaulting to ptr_mode for all address spaces. */
1460 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1465 /* Return the mode for an address in a given ADDRSPACE,
1466 defaulting to Pmode for all address spaces. */
1469 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1474 /* Named address space version of valid_pointer_mode.
1475 To match the above, the same modes apply to all address spaces. */
1478 default_addr_space_valid_pointer_mode (scalar_int_mode mode
,
1479 addr_space_t as ATTRIBUTE_UNUSED
)
1481 return targetm
.valid_pointer_mode (mode
);
1484 /* Some places still assume that all pointer or address modes are the
1485 standard Pmode and ptr_mode. These optimizations become invalid if
1486 the target actually supports multiple different modes. For now,
1487 we disable such optimizations on such targets, using this function. */
1490 target_default_pointer_address_modes_p (void)
1492 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1494 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1500 /* Named address space version of legitimate_address_p.
1501 By default, all address spaces have the same form. */
1504 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1506 addr_space_t as ATTRIBUTE_UNUSED
)
1508 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1511 /* Named address space version of LEGITIMIZE_ADDRESS.
1512 By default, all address spaces have the same form. */
1515 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1516 addr_space_t as ATTRIBUTE_UNUSED
)
1518 return targetm
.legitimize_address (x
, oldx
, mode
);
1521 /* The default hook for determining if one named address space is a subset of
1522 another and to return which address space to use as the common address
1526 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1528 return (subset
== superset
);
1531 /* The default hook for determining if 0 within a named address
1532 space is a valid address. */
1535 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1540 /* The default hook for debugging the address space is to return the
1541 address space number to indicate DW_AT_address_class. */
1543 default_addr_space_debug (addr_space_t as
)
1548 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1549 Don't complain about any address space. */
1552 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1557 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1558 called for targets with only a generic address space. */
1561 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1562 tree from_type ATTRIBUTE_UNUSED
,
1563 tree to_type ATTRIBUTE_UNUSED
)
1568 /* The defualt implementation of TARGET_HARD_REGNO_NREGS. */
1571 default_hard_regno_nregs (unsigned int, machine_mode mode
)
1573 /* Targets with variable-sized modes must provide their own definition
1575 return CEIL (GET_MODE_SIZE (mode
).to_constant (), UNITS_PER_WORD
);
1579 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1584 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1587 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1588 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1594 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1595 tree
ARG_UNUSED (name
),
1596 tree
ARG_UNUSED (args
),
1597 int ARG_UNUSED (flags
))
1599 warning (OPT_Wattributes
,
1600 "target attribute is not supported on this machine");
1606 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1607 tree
ARG_UNUSED (pop_target
))
1609 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1610 emit no warning because "#pragma GCC pop_target" is valid on targets that
1611 do not have the "target" pragma. */
1613 warning (OPT_Wpragmas
,
1614 "%<#pragma GCC target%> is not supported for this machine");
1620 default_target_can_inline_p (tree caller
, tree callee
)
1622 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1623 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1625 callee_opts
= target_option_default_node
;
1627 caller_opts
= target_option_default_node
;
1629 /* If both caller and callee have attributes, assume that if the
1630 pointer is different, the two functions have different target
1631 options since build_target_option_node uses a hash table for the
1633 return callee_opts
== caller_opts
;
1636 /* If the machine does not have a case insn that compares the bounds,
1637 this means extra overhead for dispatch tables, which raises the
1638 threshold for using them. */
1641 default_case_values_threshold (void)
1643 return (targetm
.have_casesi () ? 4 : 5);
1647 default_have_conditional_execution (void)
1649 return HAVE_conditional_execution
;
1652 /* By default we assume that c99 functions are present at the runtime,
1653 but sincos is not. */
1655 default_libc_has_function (enum function_class fn_class
)
1657 if (fn_class
== function_c94
1658 || fn_class
== function_c99_misc
1659 || fn_class
== function_c99_math_complex
)
1665 /* By default assume that libc has not a fast implementation. */
1668 default_libc_has_fast_function (int fcode ATTRIBUTE_UNUSED
)
1674 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1680 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1686 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1691 /* Compute cost of moving registers to/from memory. */
1694 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1695 reg_class_t rclass ATTRIBUTE_UNUSED
,
1696 bool in ATTRIBUTE_UNUSED
)
1698 #ifndef MEMORY_MOVE_COST
1699 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1701 return MEMORY_MOVE_COST (MACRO_MODE (mode
), (enum reg_class
) rclass
, in
);
1705 /* Compute cost of moving data from a register of class FROM to one of
1709 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1710 reg_class_t from ATTRIBUTE_UNUSED
,
1711 reg_class_t to ATTRIBUTE_UNUSED
)
1713 #ifndef REGISTER_MOVE_COST
1716 return REGISTER_MOVE_COST (MACRO_MODE (mode
),
1717 (enum reg_class
) from
, (enum reg_class
) to
);
1721 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS. */
1724 default_slow_unaligned_access (machine_mode
, unsigned int)
1726 return STRICT_ALIGNMENT
;
1729 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE. */
1732 default_estimated_poly_value (poly_int64 x
)
1737 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1738 behavior. SPEED_P is true if we are compiling for speed. */
1741 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1743 unsigned int move_ratio
;
1745 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1747 #if defined (HAVE_cpymemqi) || defined (HAVE_cpymemhi) || defined (HAVE_cpymemsi) || defined (HAVE_cpymemdi) || defined (HAVE_cpymemti)
1749 #else /* No cpymem patterns, pick a default. */
1750 move_ratio
= ((speed_p
) ? 15 : 3);
1756 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1757 used; return FALSE if the cpymem/setmem optab should be expanded, or
1758 a call to memcpy emitted. */
1761 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1762 unsigned int alignment
,
1763 enum by_pieces_operation op
,
1766 unsigned int max_size
= 0;
1767 unsigned int ratio
= 0;
1771 case CLEAR_BY_PIECES
:
1772 max_size
= STORE_MAX_PIECES
;
1773 ratio
= CLEAR_RATIO (speed_p
);
1775 case MOVE_BY_PIECES
:
1776 max_size
= MOVE_MAX_PIECES
;
1777 ratio
= get_move_ratio (speed_p
);
1780 max_size
= STORE_MAX_PIECES
;
1781 ratio
= SET_RATIO (speed_p
);
1783 case STORE_BY_PIECES
:
1784 max_size
= STORE_MAX_PIECES
;
1785 ratio
= get_move_ratio (speed_p
);
1787 case COMPARE_BY_PIECES
:
1788 max_size
= COMPARE_MAX_PIECES
;
1789 /* Pick a likely default, just as in get_move_ratio. */
1790 ratio
= speed_p
? 15 : 3;
1794 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1797 /* This hook controls code generation for expanding a memcmp operation by
1798 pieces. Return 1 for the normal pattern of compare/jump after each pair
1799 of loads, or a higher number to reduce the number of branches. */
1802 default_compare_by_pieces_branch_ratio (machine_mode
)
1807 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1808 entry. If RECORD_P is true and the target supports named sections,
1809 the location of the NOPs will be recorded in a special object section
1810 called "__patchable_function_entries". This routine may be called
1811 twice per function to put NOPs before and after the function
1815 default_print_patchable_function_entry (FILE *file
,
1816 unsigned HOST_WIDE_INT patch_area_size
,
1819 const char *nop_templ
= 0;
1821 rtx_insn
*my_nop
= make_insn_raw (gen_nop ());
1823 /* We use the template alone, relying on the (currently sane) assumption
1824 that the NOP template does not have variable operands. */
1825 code_num
= recog_memoized (my_nop
);
1826 nop_templ
= get_insn_template (code_num
, my_nop
);
1828 if (record_p
&& targetm_common
.have_named_sections
)
1831 static int patch_area_number
;
1832 section
*previous_section
= in_section
;
1833 const char *asm_op
= integer_asm_op (POINTER_SIZE_UNITS
, false);
1835 gcc_assert (asm_op
!= NULL
);
1836 patch_area_number
++;
1837 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE", patch_area_number
);
1839 switch_to_section (get_section ("__patchable_function_entries",
1840 SECTION_WRITE
| SECTION_RELRO
, NULL
));
1841 fputs (asm_op
, file
);
1842 assemble_name_raw (file
, buf
);
1845 switch_to_section (previous_section
);
1846 ASM_OUTPUT_LABEL (file
, buf
);
1850 for (i
= 0; i
< patch_area_size
; ++i
)
1851 fprintf (file
, "\t%s\n", nop_templ
);
1855 default_profile_before_prologue (void)
1857 #ifdef PROFILE_BEFORE_PROLOGUE
1864 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1867 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1870 #ifdef PREFERRED_RELOAD_CLASS
1871 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1877 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1880 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1886 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1888 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1893 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1896 default_class_likely_spilled_p (reg_class_t rclass
)
1898 return (reg_class_size
[(int) rclass
] == 1);
1901 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1904 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1905 machine_mode mode ATTRIBUTE_UNUSED
)
1907 #ifdef CLASS_MAX_NREGS
1908 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
,
1911 /* Targets with variable-sized modes must provide their own definition
1913 unsigned int size
= GET_MODE_SIZE (mode
).to_constant ();
1914 return (size
+ UNITS_PER_WORD
- 1) / UNITS_PER_WORD
;
1918 /* Determine the debugging unwind mechanism for the target. */
1920 enum unwind_info_type
1921 default_debug_unwind_info (void)
1923 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1924 /* ??? Change all users to the hook, then poison this. */
1925 #ifdef DWARF2_FRAME_INFO
1926 if (DWARF2_FRAME_INFO
)
1930 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1931 #ifdef DWARF2_DEBUGGING_INFO
1932 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1939 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
1940 must define this hook. */
1943 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
1948 /* Determine the correct mode for a Dwarf frame register that represents
1952 default_dwarf_frame_reg_mode (int regno
)
1954 machine_mode save_mode
= reg_raw_mode
[regno
];
1956 if (targetm
.hard_regno_call_part_clobbered (NULL
, regno
, save_mode
))
1957 save_mode
= choose_hard_reg_mode (regno
, 1, true);
1961 /* To be used by targets where reg_raw_mode doesn't return the right
1962 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1965 default_get_reg_raw_mode (int regno
)
1967 /* Targets must override this hook if the underlying register is
1969 return as_a
<fixed_size_mode
> (reg_raw_mode
[regno
]);
1972 /* Return true if a leaf function should stay leaf even with profiling
1976 default_keep_leaf_when_profiled ()
1981 /* Return true if the state of option OPTION should be stored in PCH files
1982 and checked by default_pch_valid_p. Store the option's current state
1986 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1988 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1990 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1992 if (option_flag_var (option
, &global_options
) == &target_flags
)
1993 if (targetm
.check_pch_target_flags
)
1995 return get_option_state (&global_options
, option
, state
);
1998 /* Default version of get_pch_validity.
1999 By default, every flag difference is fatal; that will be mostly right for
2000 most targets, but completely right for very few. */
2003 default_get_pch_validity (size_t *sz
)
2005 struct cl_option_state state
;
2010 if (targetm
.check_pch_target_flags
)
2011 *sz
+= sizeof (target_flags
);
2012 for (i
= 0; i
< cl_options_count
; i
++)
2013 if (option_affects_pch_p (i
, &state
))
2016 result
= r
= XNEWVEC (char, *sz
);
2020 if (targetm
.check_pch_target_flags
)
2022 memcpy (r
, &target_flags
, sizeof (target_flags
));
2023 r
+= sizeof (target_flags
);
2026 for (i
= 0; i
< cl_options_count
; i
++)
2027 if (option_affects_pch_p (i
, &state
))
2029 memcpy (r
, state
.data
, state
.size
);
2036 /* Return a message which says that a PCH file was created with a different
2037 setting of OPTION. */
2040 pch_option_mismatch (const char *option
)
2042 return xasprintf (_("created and used with differing settings of '%s'"),
2046 /* Default version of pch_valid_p. */
2049 default_pch_valid_p (const void *data_p
, size_t len
)
2051 struct cl_option_state state
;
2052 const char *data
= (const char *)data_p
;
2055 /* -fpic and -fpie also usually make a PCH invalid. */
2056 if (data
[0] != flag_pic
)
2057 return _("created and used with different settings of %<-fpic%>");
2058 if (data
[1] != flag_pie
)
2059 return _("created and used with different settings of %<-fpie%>");
2062 /* Check target_flags. */
2063 if (targetm
.check_pch_target_flags
)
2068 memcpy (&tf
, data
, sizeof (target_flags
));
2069 data
+= sizeof (target_flags
);
2070 len
-= sizeof (target_flags
);
2071 r
= targetm
.check_pch_target_flags (tf
);
2076 for (i
= 0; i
< cl_options_count
; i
++)
2077 if (option_affects_pch_p (i
, &state
))
2079 if (memcmp (data
, state
.data
, state
.size
) != 0)
2080 return pch_option_mismatch (cl_options
[i
].opt_text
);
2088 /* Default version of cstore_mode. */
2091 default_cstore_mode (enum insn_code icode
)
2093 return as_a
<scalar_int_mode
> (insn_data
[(int) icode
].operand
[0].mode
);
2096 /* Default version of member_type_forces_blk. */
2099 default_member_type_forces_blk (const_tree
, machine_mode
)
2105 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
2106 rtx ptr ATTRIBUTE_UNUSED
,
2107 rtx bnd ATTRIBUTE_UNUSED
)
2113 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
2114 rtx addr ATTRIBUTE_UNUSED
,
2115 rtx bounds ATTRIBUTE_UNUSED
,
2116 rtx to ATTRIBUTE_UNUSED
)
2122 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
2128 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
2129 rtx bounds ATTRIBUTE_UNUSED
)
2134 /* Default version of canonicalize_comparison. */
2137 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
2141 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
2144 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
2148 #ifndef PAD_VARARGS_DOWN
2149 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2152 /* Build an indirect-ref expression over the given TREE, which represents a
2153 piece of a va_arg() expansion. */
2155 build_va_arg_indirect_ref (tree addr
)
2157 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
2161 /* The "standard" implementation of va_arg: read the value from the
2162 current (padded) address and increment by the (padded) size. */
2165 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
2168 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
2169 unsigned HOST_WIDE_INT align
, boundary
;
2172 /* All of the alignment and movement below is for args-grow-up machines.
2173 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2174 implement their own specialized gimplify_va_arg_expr routines. */
2175 if (ARGS_GROW_DOWNWARD
)
2178 indirect
= pass_va_arg_by_reference (type
);
2180 type
= build_pointer_type (type
);
2182 if (targetm
.calls
.split_complex_arg
2183 && TREE_CODE (type
) == COMPLEX_TYPE
2184 && targetm
.calls
.split_complex_arg (type
))
2186 tree real_part
, imag_part
;
2188 real_part
= std_gimplify_va_arg_expr (valist
,
2189 TREE_TYPE (type
), pre_p
, NULL
);
2190 real_part
= get_initialized_tmp_var (real_part
, pre_p
, NULL
);
2192 imag_part
= std_gimplify_va_arg_expr (unshare_expr (valist
),
2193 TREE_TYPE (type
), pre_p
, NULL
);
2194 imag_part
= get_initialized_tmp_var (imag_part
, pre_p
, NULL
);
2196 return build2 (COMPLEX_EXPR
, type
, real_part
, imag_part
);
2199 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2200 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
2202 /* When we align parameter on stack for caller, if the parameter
2203 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2204 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
2205 here with caller. */
2206 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
2207 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
2209 boundary
/= BITS_PER_UNIT
;
2211 /* Hoist the valist value into a temporary for the moment. */
2212 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
2214 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
2215 requires greater alignment, we must perform dynamic alignment. */
2216 if (boundary
> align
2217 && !TYPE_EMPTY_P (type
)
2218 && !integer_zerop (TYPE_SIZE (type
)))
2220 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2221 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
2222 gimplify_and_add (t
, pre_p
);
2224 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2225 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
2227 build_int_cst (TREE_TYPE (valist
), -boundary
)));
2228 gimplify_and_add (t
, pre_p
);
2233 /* If the actual alignment is less than the alignment of the type,
2234 adjust the type accordingly so that we don't assume strict alignment
2235 when dereferencing the pointer. */
2236 boundary
*= BITS_PER_UNIT
;
2237 if (boundary
< TYPE_ALIGN (type
))
2239 type
= build_variant_type_copy (type
);
2240 SET_TYPE_ALIGN (type
, boundary
);
2243 /* Compute the rounded size of the type. */
2244 type_size
= arg_size_in_bytes (type
);
2245 rounded_size
= round_up (type_size
, align
);
2247 /* Reduce rounded_size so it's sharable with the postqueue. */
2248 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2252 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2254 /* Small args are padded downward. */
2255 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2256 rounded_size
, size_int (align
));
2257 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2258 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2259 addr
= fold_build_pointer_plus (addr
, t
);
2262 /* Compute new value for AP. */
2263 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2264 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2265 gimplify_and_add (t
, pre_p
);
2267 addr
= fold_convert (build_pointer_type (type
), addr
);
2270 addr
= build_va_arg_indirect_ref (addr
);
2272 return build_va_arg_indirect_ref (addr
);
2275 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2276 not support nested low-overhead loops. */
2279 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2280 unsigned int loop_depth
, bool)
2282 return loop_depth
== 1;
2285 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2288 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2293 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2296 default_max_noce_ifcvt_seq_cost (edge e
)
2298 bool predictable_p
= predictable_edge_p (e
);
2300 enum compiler_param param
2302 ? PARAM_MAX_RTL_IF_CONVERSION_PREDICTABLE_COST
2303 : PARAM_MAX_RTL_IF_CONVERSION_UNPREDICTABLE_COST
);
2305 /* If we have a parameter set, use that, otherwise take a guess using
2307 if (global_options_set
.x_param_values
[param
])
2308 return PARAM_VALUE (param
);
2310 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2313 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2316 default_min_arithmetic_precision (void)
2318 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2321 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2323 enum flt_eval_method
2324 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2326 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2329 /* Default implementation for
2330 TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE. */
2332 default_stack_clash_protection_alloca_probe_range (void)
2337 /* The default implementation of TARGET_EARLY_REMAT_MODES. */
2340 default_select_early_remat_modes (sbitmap
)
2344 /* The default implementation of TARGET_PREFERRED_ELSE_VALUE. */
2347 default_preferred_else_value (unsigned, tree type
, unsigned, tree
*)
2349 return build_zero_cst (type
);
2352 /* Default implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE. */
2354 default_have_speculation_safe_value (bool active ATTRIBUTE_UNUSED
)
2356 #ifdef HAVE_speculation_barrier
2357 return active
? HAVE_speculation_barrier
: true;
2362 /* Alternative implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE
2363 that can be used on targets that never have speculative execution. */
2365 speculation_safe_value_not_needed (bool active
)
2370 /* Default implementation of the speculation-safe-load builtin. This
2371 implementation simply copies val to result and generates a
2372 speculation_barrier insn, if such a pattern is defined. */
2374 default_speculation_safe_value (machine_mode mode ATTRIBUTE_UNUSED
,
2375 rtx result
, rtx val
,
2376 rtx failval ATTRIBUTE_UNUSED
)
2378 emit_move_insn (result
, val
);
2380 #ifdef HAVE_speculation_barrier
2381 /* Assume the target knows what it is doing: if it defines a
2382 speculation barrier, but it is not enabled, then assume that one
2384 if (HAVE_speculation_barrier
)
2385 emit_insn (gen_speculation_barrier ());
2392 default_remove_extra_call_preserved_regs (rtx_insn
*, HARD_REG_SET
*)
2396 #include "gt-targhooks.h"