1 /* Default target hook functions.
2 Copyright (C) 2003-2021 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* The migration of target macros to target hooks works as follows:
22 1. Create a target hook that uses the existing target macros to
23 implement the same functionality.
25 2. Convert all the MI files to use the hook instead of the macro.
27 3. Repeat for a majority of the remaining target macros. This will
30 4. Tell target maintainers to start migrating.
32 5. Eventually convert the backends to override the hook instead of
33 defining the macros. This will take some time too.
35 6. TBD when, poison the macros. Unmigrated targets will break at
38 Note that we expect steps 1-3 to be done by the people that
39 understand what the MI does with each macro, and step 5 to be done
40 by the target maintainers for their respective targets.
42 Note that steps 1 and 2 don't have to be done together, but no
43 target can override the new hook until step 2 is complete for it.
45 Once the macros are poisoned, we will revert to the old migration
46 rules - migrate the macro, callers, and targets all at once. This
47 comment can thus be removed at that point. */
51 #include "coretypes.h"
56 #include "tree-ssa-alias.h"
57 #include "gimple-expr.h"
63 #include "stringpool.h"
65 #include "tree-ssanames.h"
66 #include "profile-count.h"
70 #include "diagnostic-core.h"
71 #include "fold-const.h"
72 #include "stor-layout.h"
80 #include "common/common-target.h"
87 #include "langhooks.h"
89 #include "function-abi.h"
95 #include "tree-vectorizer.h"
98 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
99 rtx addr ATTRIBUTE_UNUSED
,
100 bool strict ATTRIBUTE_UNUSED
)
102 #ifdef GO_IF_LEGITIMATE_ADDRESS
103 /* Defer to the old implementation using a goto. */
105 return strict_memory_address_p (mode
, addr
);
107 return memory_address_p (mode
, addr
);
114 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
116 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
117 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
122 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
126 /* Any floating arithmetic may trap. */
127 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
130 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
132 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
140 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
142 int *punsignedp ATTRIBUTE_UNUSED
,
143 const_tree funtype ATTRIBUTE_UNUSED
,
144 int for_return ATTRIBUTE_UNUSED
)
146 if (type
!= NULL_TREE
&& for_return
== 2)
147 return promote_mode (type
, mode
, punsignedp
);
152 default_promote_function_mode_always_promote (const_tree type
,
155 const_tree funtype ATTRIBUTE_UNUSED
,
156 int for_return ATTRIBUTE_UNUSED
)
158 return promote_mode (type
, mode
, punsignedp
);
162 default_cc_modes_compatible (machine_mode m1
, machine_mode m2
)
170 default_return_in_memory (const_tree type
,
171 const_tree fntype ATTRIBUTE_UNUSED
)
173 return (TYPE_MODE (type
) == BLKmode
);
177 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
178 machine_mode mode ATTRIBUTE_UNUSED
)
184 default_legitimize_address_displacement (rtx
*, rtx
*, poly_int64
,
191 default_const_not_ok_for_debug_p (rtx x
)
193 if (GET_CODE (x
) == UNSPEC
)
199 default_expand_builtin_saveregs (void)
201 error ("%<__builtin_saveregs%> not supported by this target");
206 default_setup_incoming_varargs (cumulative_args_t
,
207 const function_arg_info
&, int *, int)
211 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
214 default_builtin_setjmp_frame_value (void)
216 return virtual_stack_vars_rtx
;
219 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
222 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
228 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
230 return (targetm
.calls
.setup_incoming_varargs
231 != default_setup_incoming_varargs
);
235 default_eh_return_filter_mode (void)
237 return targetm
.unwind_word_mode ();
241 default_libgcc_cmp_return_mode (void)
247 default_libgcc_shift_count_mode (void)
253 default_unwind_word_mode (void)
258 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
260 unsigned HOST_WIDE_INT
261 default_shift_truncation_mask (machine_mode mode
)
263 return SHIFT_COUNT_TRUNCATED
? GET_MODE_UNIT_BITSIZE (mode
) - 1 : 0;
266 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
269 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED
)
271 return have_insn_for (DIV
, mode
) ? 3 : 2;
274 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
277 default_mode_rep_extended (scalar_int_mode
, scalar_int_mode
)
282 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
285 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
290 /* Return machine mode for non-standard suffix
291 or VOIDmode if non-standard suffixes are unsupported. */
293 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
298 /* The generic C++ ABI specifies this is a 64-bit value. */
300 default_cxx_guard_type (void)
302 return long_long_integer_type_node
;
305 /* Returns the size of the cookie to use when allocating an array
306 whose elements have the indicated TYPE. Assumes that it is already
307 known that a cookie is needed. */
310 default_cxx_get_cookie_size (tree type
)
314 /* We need to allocate an additional max (sizeof (size_t), alignof
315 (true_type)) bytes. */
319 sizetype_size
= size_in_bytes (sizetype
);
320 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
321 if (tree_int_cst_lt (type_align
, sizetype_size
))
322 cookie_size
= sizetype_size
;
324 cookie_size
= type_align
;
329 /* Return true if a parameter must be passed by reference. This version
330 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
333 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t
,
334 const function_arg_info
&arg
)
336 return targetm
.calls
.must_pass_in_stack (arg
);
339 /* Return true if a parameter follows callee copies conventions. This
340 version of the hook is true for all named arguments. */
343 hook_callee_copies_named (cumulative_args_t
, const function_arg_info
&arg
)
348 /* Emit to STREAM the assembler syntax for insn operand X. */
351 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
352 int code ATTRIBUTE_UNUSED
)
355 PRINT_OPERAND (stream
, x
, code
);
361 /* Emit to STREAM the assembler syntax for an insn operand whose memory
365 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
366 machine_mode
/*mode*/,
367 rtx x ATTRIBUTE_UNUSED
)
369 #ifdef PRINT_OPERAND_ADDRESS
370 PRINT_OPERAND_ADDRESS (stream
, x
);
376 /* Return true if CODE is a valid punctuation character for the
377 `print_operand' hook. */
380 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
382 #ifdef PRINT_OPERAND_PUNCT_VALID_P
383 return PRINT_OPERAND_PUNCT_VALID_P (code
);
389 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
391 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
393 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
394 const char *stripped
= targetm
.strip_name_encoding (skipped
);
395 if (*name
!= '*' && user_label_prefix
[0])
396 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
397 return get_identifier (stripped
);
400 /* The default implementation of TARGET_TRANSLATE_MODE_ATTRIBUTE. */
403 default_translate_mode_attribute (machine_mode mode
)
408 /* True if MODE is valid for the target. By "valid", we mean able to
409 be manipulated in non-trivial ways. In particular, this means all
410 the arithmetic is supported.
412 By default we guess this means that any C type is supported. If
413 we can't map the mode back to a type that would be available in C,
414 then reject it. Special case, here, is the double-word arithmetic
415 supported by optabs.c. */
418 default_scalar_mode_supported_p (scalar_mode mode
)
420 int precision
= GET_MODE_PRECISION (mode
);
422 switch (GET_MODE_CLASS (mode
))
424 case MODE_PARTIAL_INT
:
426 if (precision
== CHAR_TYPE_SIZE
)
428 if (precision
== SHORT_TYPE_SIZE
)
430 if (precision
== INT_TYPE_SIZE
)
432 if (precision
== LONG_TYPE_SIZE
)
434 if (precision
== LONG_LONG_TYPE_SIZE
)
436 if (precision
== 2 * BITS_PER_WORD
)
441 if (precision
== FLOAT_TYPE_SIZE
)
443 if (precision
== DOUBLE_TYPE_SIZE
)
445 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
449 case MODE_DECIMAL_FLOAT
:
461 /* Return true if libgcc supports floating-point mode MODE (known to
462 be supported as a scalar mode). */
465 default_libgcc_floating_mode_supported_p (scalar_float_mode mode
)
488 /* Return the machine mode to use for the type _FloatN, if EXTENDED is
489 false, or _FloatNx, if EXTENDED is true, or VOIDmode if not
491 opt_scalar_float_mode
492 default_floatn_mode (int n
, bool extended
)
496 opt_scalar_float_mode cand1
, cand2
;
497 scalar_float_mode mode
;
519 /* Those are the only valid _FloatNx types. */
522 if (cand1
.exists (&mode
)
523 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
524 && targetm
.scalar_mode_supported_p (mode
)
525 && targetm
.libgcc_floating_mode_supported_p (mode
))
527 if (cand2
.exists (&mode
)
528 && REAL_MODE_FORMAT (mode
)->ieee_bits
> n
529 && targetm
.scalar_mode_supported_p (mode
)
530 && targetm
.libgcc_floating_mode_supported_p (mode
))
535 opt_scalar_float_mode cand
;
536 scalar_float_mode mode
;
540 /* Always enable _Float16 if we have basic support for the mode.
541 Targets can control the range and precision of operations on
542 the _Float16 type using TARGET_C_EXCESS_PRECISION. */
569 if (cand
.exists (&mode
)
570 && REAL_MODE_FORMAT (mode
)->ieee_bits
== n
571 && targetm
.scalar_mode_supported_p (mode
)
572 && targetm
.libgcc_floating_mode_supported_p (mode
))
575 return opt_scalar_float_mode ();
578 /* Define this to return true if the _Floatn and _Floatnx built-in functions
579 should implicitly enable the built-in function without the __builtin_ prefix
580 in addition to the normal built-in function with the __builtin_ prefix. The
581 default is to only enable built-in functions without the __builtin_ prefix
582 for the GNU C langauge. The argument FUNC is the enum builtin_in_function
583 id of the function to be enabled. */
586 default_floatn_builtin_p (int func ATTRIBUTE_UNUSED
)
588 static bool first_time_p
= true;
589 static bool c_or_objective_c
;
593 first_time_p
= false;
594 c_or_objective_c
= lang_GNU_C () || lang_GNU_OBJC ();
597 return c_or_objective_c
;
600 /* Make some target macros useable by target-independent code. */
602 targhook_words_big_endian (void)
604 return !!WORDS_BIG_ENDIAN
;
608 targhook_float_words_big_endian (void)
610 return !!FLOAT_WORDS_BIG_ENDIAN
;
613 /* True if the target supports floating-point exceptions and rounding
617 default_float_exceptions_rounding_supported_p (void)
626 /* True if the target supports decimal floating point. */
629 default_decimal_float_supported_p (void)
631 return ENABLE_DECIMAL_FLOAT
;
634 /* True if the target supports fixed-point arithmetic. */
637 default_fixed_point_supported_p (void)
639 return ENABLE_FIXED_POINT
;
642 /* True if the target supports GNU indirect functions. */
645 default_has_ifunc_p (void)
647 return HAVE_GNU_INDIRECT_FUNCTION
;
650 /* Return true if we predict the loop LOOP will be transformed to a
651 low-overhead loop, otherwise return false.
653 By default, false is returned, as this hook's applicability should be
654 verified for each target. Target maintainers should re-define the hook
655 if the target can take advantage of it. */
658 default_predict_doloop_p (class loop
*loop ATTRIBUTE_UNUSED
)
663 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
666 This function checks whether a given INSN is valid within a low-overhead
667 loop. If INSN is invalid it returns the reason for that, otherwise it
668 returns NULL. A called function may clobber any special registers required
669 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
670 register for branch on table instructions. We reject the doloop pattern in
674 default_invalid_within_doloop (const rtx_insn
*insn
)
677 return "Function call in loop.";
679 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
680 return "Computed branch in the loop.";
685 /* Mapping of builtin functions to vectorized variants. */
688 default_builtin_vectorized_function (unsigned int, tree
, tree
)
693 /* Mapping of target builtin functions to vectorized variants. */
696 default_builtin_md_vectorized_function (tree
, tree
, tree
)
701 /* Default vectorizer cost model values. */
704 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
706 int misalign ATTRIBUTE_UNUSED
)
708 switch (type_of_cost
)
718 case cond_branch_not_taken
:
720 case vec_promote_demote
:
724 case unaligned_store
:
727 case cond_branch_taken
:
731 return estimated_poly_value (TYPE_VECTOR_SUBPARTS (vectype
)) - 1;
741 default_builtin_reciprocal (tree
)
747 hook_bool_CUMULATIVE_ARGS_arg_info_false (cumulative_args_t
,
748 const function_arg_info
&)
754 hook_bool_CUMULATIVE_ARGS_arg_info_true (cumulative_args_t
,
755 const function_arg_info
&)
761 hook_int_CUMULATIVE_ARGS_arg_info_0 (cumulative_args_t
,
762 const function_arg_info
&)
768 hook_void_CUMULATIVE_ARGS_tree (cumulative_args_t ca ATTRIBUTE_UNUSED
,
769 tree ATTRIBUTE_UNUSED
)
774 default_function_arg_advance (cumulative_args_t
, const function_arg_info
&)
779 /* Default implementation of TARGET_FUNCTION_ARG_OFFSET. */
782 default_function_arg_offset (machine_mode
, const_tree
)
787 /* Default implementation of TARGET_FUNCTION_ARG_PADDING: usually pad
788 upward, but pad short args downward on big-endian machines. */
791 default_function_arg_padding (machine_mode mode
, const_tree type
)
793 if (!BYTES_BIG_ENDIAN
)
796 unsigned HOST_WIDE_INT size
;
799 if (!type
|| TREE_CODE (TYPE_SIZE (type
)) != INTEGER_CST
)
801 size
= int_size_in_bytes (type
);
804 /* Targets with variable-sized modes must override this hook
805 and handle variable-sized modes explicitly. */
806 size
= GET_MODE_SIZE (mode
).to_constant ();
808 if (size
< (PARM_BOUNDARY
/ BITS_PER_UNIT
))
815 default_function_arg (cumulative_args_t
, const function_arg_info
&)
821 default_function_incoming_arg (cumulative_args_t
, const function_arg_info
&)
827 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
828 const_tree type ATTRIBUTE_UNUSED
)
830 return PARM_BOUNDARY
;
834 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
835 const_tree type ATTRIBUTE_UNUSED
)
837 return PARM_BOUNDARY
;
841 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
846 hook_invalid_arg_for_unprototyped_fn (
847 const_tree typelist ATTRIBUTE_UNUSED
,
848 const_tree funcdecl ATTRIBUTE_UNUSED
,
849 const_tree val ATTRIBUTE_UNUSED
)
854 /* Initialize the stack protection decls. */
856 /* Stack protection related decls living in libgcc. */
857 static GTY(()) tree stack_chk_guard_decl
;
860 default_stack_protect_guard (void)
862 tree t
= stack_chk_guard_decl
;
868 t
= build_decl (UNKNOWN_LOCATION
,
869 VAR_DECL
, get_identifier ("__stack_chk_guard"),
873 DECL_EXTERNAL (t
) = 1;
875 TREE_THIS_VOLATILE (t
) = 1;
876 DECL_ARTIFICIAL (t
) = 1;
877 DECL_IGNORED_P (t
) = 1;
879 /* Do not share RTL as the declaration is visible outside of
882 RTX_FLAG (x
, used
) = 1;
884 stack_chk_guard_decl
= t
;
890 static GTY(()) tree stack_chk_fail_decl
;
893 default_external_stack_protect_fail (void)
895 tree t
= stack_chk_fail_decl
;
899 t
= build_function_type_list (void_type_node
, NULL_TREE
);
900 t
= build_decl (UNKNOWN_LOCATION
,
901 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
904 DECL_EXTERNAL (t
) = 1;
906 TREE_THIS_VOLATILE (t
) = 1;
907 TREE_NOTHROW (t
) = 1;
908 DECL_ARTIFICIAL (t
) = 1;
909 DECL_IGNORED_P (t
) = 1;
910 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
911 DECL_VISIBILITY_SPECIFIED (t
) = 1;
913 stack_chk_fail_decl
= t
;
916 return build_call_expr (t
, 0);
920 default_hidden_stack_protect_fail (void)
922 #ifndef HAVE_GAS_HIDDEN
923 return default_external_stack_protect_fail ();
925 tree t
= stack_chk_fail_decl
;
928 return default_external_stack_protect_fail ();
932 t
= build_function_type_list (void_type_node
, NULL_TREE
);
933 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
934 get_identifier ("__stack_chk_fail_local"), t
);
937 DECL_EXTERNAL (t
) = 1;
939 TREE_THIS_VOLATILE (t
) = 1;
940 TREE_NOTHROW (t
) = 1;
941 DECL_ARTIFICIAL (t
) = 1;
942 DECL_IGNORED_P (t
) = 1;
943 DECL_VISIBILITY_SPECIFIED (t
) = 1;
944 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
946 stack_chk_fail_decl
= t
;
949 return build_call_expr (t
, 0);
954 hook_bool_const_rtx_commutative_p (const_rtx x
,
955 int outer_code ATTRIBUTE_UNUSED
)
957 return COMMUTATIVE_P (x
);
961 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
962 const_tree fn_decl_or_type
,
963 bool outgoing ATTRIBUTE_UNUSED
)
965 /* The old interface doesn't handle receiving the function type. */
967 && !DECL_P (fn_decl_or_type
))
968 fn_decl_or_type
= NULL
;
970 #ifdef FUNCTION_VALUE
971 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
978 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
979 const_rtx fun ATTRIBUTE_UNUSED
)
982 return LIBCALL_VALUE (MACRO_MODE (mode
));
988 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
991 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
993 #ifdef FUNCTION_VALUE_REGNO_P
994 return FUNCTION_VALUE_REGNO_P (regno
);
1000 /* The default hook for TARGET_ZERO_CALL_USED_REGS. */
1003 default_zero_call_used_regs (HARD_REG_SET need_zeroed_hardregs
)
1005 gcc_assert (!hard_reg_set_empty_p (need_zeroed_hardregs
));
1007 HARD_REG_SET failed
;
1008 CLEAR_HARD_REG_SET (failed
);
1009 bool progress
= false;
1011 /* First, try to zero each register in need_zeroed_hardregs by
1012 loading a zero into it, taking note of any failures in
1014 for (unsigned int regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1015 if (TEST_HARD_REG_BIT (need_zeroed_hardregs
, regno
))
1017 rtx_insn
*last_insn
= get_last_insn ();
1018 machine_mode mode
= GET_MODE (regno_reg_rtx
[regno
]);
1019 rtx zero
= CONST0_RTX (mode
);
1020 rtx_insn
*insn
= emit_move_insn (regno_reg_rtx
[regno
], zero
);
1021 if (!valid_insn_p (insn
))
1023 SET_HARD_REG_BIT (failed
, regno
);
1024 delete_insns_since (last_insn
);
1030 /* Now retry with copies from zeroed registers, as long as we've
1031 made some PROGRESS, and registers remain to be zeroed in
1033 while (progress
&& !hard_reg_set_empty_p (failed
))
1035 HARD_REG_SET retrying
= failed
;
1037 CLEAR_HARD_REG_SET (failed
);
1040 for (unsigned int regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
1041 if (TEST_HARD_REG_BIT (retrying
, regno
))
1043 machine_mode mode
= GET_MODE (regno_reg_rtx
[regno
]);
1044 bool success
= false;
1045 /* Look for a source. */
1046 for (unsigned int src
= 0; src
< FIRST_PSEUDO_REGISTER
; src
++)
1048 /* If SRC hasn't been zeroed (yet?), skip it. */
1049 if (! TEST_HARD_REG_BIT (need_zeroed_hardregs
, src
))
1051 if (TEST_HARD_REG_BIT (retrying
, src
))
1054 /* Check that SRC can hold MODE, and that any other
1055 registers needed to hold MODE in SRC have also been
1057 if (!targetm
.hard_regno_mode_ok (src
, mode
))
1059 unsigned n
= targetm
.hard_regno_nregs (src
, mode
);
1061 for (unsigned i
= 1; ok
&& i
< n
; i
++)
1062 ok
= (TEST_HARD_REG_BIT (need_zeroed_hardregs
, src
+ i
)
1063 && !TEST_HARD_REG_BIT (retrying
, src
+ i
));
1067 /* SRC is usable, try to copy from it. */
1068 rtx_insn
*last_insn
= get_last_insn ();
1069 rtx zsrc
= gen_rtx_REG (mode
, src
);
1070 rtx_insn
*insn
= emit_move_insn (regno_reg_rtx
[regno
], zsrc
);
1071 if (!valid_insn_p (insn
))
1072 /* It didn't work, remove any inserts. We'll look
1074 delete_insns_since (last_insn
);
1077 /* We're done for REGNO. */
1083 /* If nothing worked for REGNO this round, marked it to be
1084 retried if we get another round. */
1086 SET_HARD_REG_BIT (failed
, regno
);
1088 /* Take note so as to enable another round if needed. */
1093 /* If any register remained, report it. */
1096 static bool issued_error
;
1099 issued_error
= true;
1100 sorry ("%qs not supported on this target",
1101 "-fzero-call-used-regs");
1105 return need_zeroed_hardregs
;
1109 default_internal_arg_pointer (void)
1111 /* If the reg that the virtual arg pointer will be translated into is
1112 not a fixed reg or is the stack pointer, make a copy of the virtual
1113 arg pointer, and address parms via the copy. The frame pointer is
1114 considered fixed even though it is not marked as such. */
1115 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
1116 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
1117 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
1118 return copy_to_reg (virtual_incoming_args_rtx
);
1120 return virtual_incoming_args_rtx
;
1124 default_static_chain (const_tree
ARG_UNUSED (fndecl_or_type
), bool incoming_p
)
1128 #ifdef STATIC_CHAIN_INCOMING_REGNUM
1129 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
1133 #ifdef STATIC_CHAIN_REGNUM
1134 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
1138 static bool issued_error
;
1141 issued_error
= true;
1142 sorry ("nested functions not supported on this target");
1145 /* It really doesn't matter what we return here, so long at it
1146 doesn't cause the rest of the compiler to crash. */
1147 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
1152 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
1153 rtx
ARG_UNUSED (r_chain
))
1155 sorry ("nested function trampolines not supported on this target");
1159 default_return_pops_args (tree
, tree
, poly_int64
)
1165 default_ira_change_pseudo_allocno_class (int regno ATTRIBUTE_UNUSED
,
1167 reg_class_t best_cl ATTRIBUTE_UNUSED
)
1173 default_lra_p (void)
1179 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
1185 default_register_usage_leveling_p (void)
1191 default_different_addr_displacement_p (void)
1197 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
1198 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
1199 machine_mode reload_mode ATTRIBUTE_UNUSED
,
1200 secondary_reload_info
*sri
)
1202 enum reg_class rclass
= NO_REGS
;
1203 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
1205 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
1207 sri
->icode
= sri
->prev_sri
->t_icode
;
1210 #ifdef SECONDARY_INPUT_RELOAD_CLASS
1212 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
,
1213 MACRO_MODE (reload_mode
), x
);
1215 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
1217 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
,
1218 MACRO_MODE (reload_mode
), x
);
1220 if (rclass
!= NO_REGS
)
1222 enum insn_code icode
1223 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
1226 if (icode
!= CODE_FOR_nothing
1227 && !insn_operand_matches (icode
, in_p
, x
))
1228 icode
= CODE_FOR_nothing
;
1229 else if (icode
!= CODE_FOR_nothing
)
1231 const char *insn_constraint
, *scratch_constraint
;
1232 enum reg_class insn_class
, scratch_class
;
1234 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
1235 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
1236 if (!*insn_constraint
)
1237 insn_class
= ALL_REGS
;
1242 gcc_assert (*insn_constraint
== '=');
1245 insn_class
= (reg_class_for_constraint
1246 (lookup_constraint (insn_constraint
)));
1247 gcc_assert (insn_class
!= NO_REGS
);
1250 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
1251 /* The scratch register's constraint must start with "=&",
1252 except for an input reload, where only "=" is necessary,
1253 and where it might be beneficial to re-use registers from
1255 gcc_assert (scratch_constraint
[0] == '='
1256 && (in_p
|| scratch_constraint
[1] == '&'));
1257 scratch_constraint
++;
1258 if (*scratch_constraint
== '&')
1259 scratch_constraint
++;
1260 scratch_class
= (reg_class_for_constraint
1261 (lookup_constraint (scratch_constraint
)));
1263 if (reg_class_subset_p (reload_class
, insn_class
))
1265 gcc_assert (scratch_class
== rclass
);
1269 rclass
= insn_class
;
1272 if (rclass
== NO_REGS
)
1275 sri
->t_icode
= icode
;
1280 /* The default implementation of TARGET_SECONDARY_MEMORY_NEEDED_MODE. */
1283 default_secondary_memory_needed_mode (machine_mode mode
)
1285 if (!targetm
.lra_p ()
1286 && known_lt (GET_MODE_BITSIZE (mode
), BITS_PER_WORD
)
1287 && INTEGRAL_MODE_P (mode
))
1288 return mode_for_size (BITS_PER_WORD
, GET_MODE_CLASS (mode
), 0).require ();
1292 /* By default, if flag_pic is true, then neither local nor global relocs
1293 should be placed in readonly memory. */
1296 default_reloc_rw_mask (void)
1298 return flag_pic
? 3 : 0;
1301 /* By default, address diff vectors are generated
1302 for jump tables when flag_pic is true. */
1305 default_generate_pic_addr_diff_vec (void)
1310 /* By default, do no modification. */
1311 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1317 /* The default implementation of TARGET_STATIC_RTX_ALIGNMENT. */
1320 default_static_rtx_alignment (machine_mode mode
)
1322 return GET_MODE_ALIGNMENT (mode
);
1325 /* The default implementation of TARGET_CONSTANT_ALIGNMENT. */
1328 default_constant_alignment (const_tree
, HOST_WIDE_INT align
)
1333 /* An implementation of TARGET_CONSTANT_ALIGNMENT that aligns strings
1334 to at least BITS_PER_WORD but otherwise makes no changes. */
1337 constant_alignment_word_strings (const_tree exp
, HOST_WIDE_INT align
)
1339 if (TREE_CODE (exp
) == STRING_CST
)
1340 return MAX (align
, BITS_PER_WORD
);
1344 /* Default to natural alignment for vector types, bounded by
1345 MAX_OFILE_ALIGNMENT. */
1348 default_vector_alignment (const_tree type
)
1350 unsigned HOST_WIDE_INT align
= MAX_OFILE_ALIGNMENT
;
1351 tree size
= TYPE_SIZE (type
);
1352 if (tree_fits_uhwi_p (size
))
1353 align
= tree_to_uhwi (size
);
1354 if (align
>= MAX_OFILE_ALIGNMENT
)
1355 return MAX_OFILE_ALIGNMENT
;
1356 return MAX (align
, GET_MODE_ALIGNMENT (TYPE_MODE (type
)));
1359 /* The default implementation of
1360 TARGET_VECTORIZE_PREFERRED_VECTOR_ALIGNMENT. */
1363 default_preferred_vector_alignment (const_tree type
)
1365 return TYPE_ALIGN (type
);
1368 /* By default assume vectors of element TYPE require a multiple of the natural
1369 alignment of TYPE. TYPE is naturally aligned if IS_PACKED is false. */
1371 default_builtin_vector_alignment_reachable (const_tree
/*type*/, bool is_packed
)
1376 /* By default, assume that a target supports any factor of misalignment
1377 memory access if it supports movmisalign patten.
1378 is_packed is true if the memory access is defined in a packed struct. */
1380 default_builtin_support_vector_misalignment (machine_mode mode
,
1388 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1393 /* By default, only attempt to parallelize bitwise operations, and
1394 possibly adds/subtracts using bit-twiddling. */
1397 default_preferred_simd_mode (scalar_mode
)
1402 /* By default do not split reductions further. */
1405 default_split_reduction (machine_mode mode
)
1410 /* By default only the preferred vector mode is tried. */
1413 default_autovectorize_vector_modes (vector_modes
*, bool)
1418 /* The default implementation of TARGET_VECTORIZE_RELATED_MODE. */
1421 default_vectorize_related_mode (machine_mode vector_mode
,
1422 scalar_mode element_mode
,
1425 machine_mode result_mode
;
1426 if ((maybe_ne (nunits
, 0U)
1427 || multiple_p (GET_MODE_SIZE (vector_mode
),
1428 GET_MODE_SIZE (element_mode
), &nunits
))
1429 && mode_for_vector (element_mode
, nunits
).exists (&result_mode
)
1430 && VECTOR_MODE_P (result_mode
)
1431 && targetm
.vector_mode_supported_p (result_mode
))
1434 return opt_machine_mode ();
1437 /* By default a vector of integers is used as a mask. */
1440 default_get_mask_mode (machine_mode mode
)
1442 return related_int_vector_mode (mode
);
1445 /* By default consider masked stores to be expensive. */
1448 default_empty_mask_is_expensive (unsigned ifn
)
1450 return ifn
== IFN_MASK_STORE
;
1453 /* By default, the cost model accumulates three separate costs (prologue,
1454 loop body, and epilogue) for a vectorized loop or block. So allocate an
1455 array of three unsigned ints, set it to zero, and return its address. */
1458 default_init_cost (class loop
*loop_info ATTRIBUTE_UNUSED
,
1459 bool costing_for_scalar ATTRIBUTE_UNUSED
)
1461 unsigned *cost
= XNEWVEC (unsigned, 3);
1462 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1466 /* By default, the cost model looks up the cost of the given statement
1467 kind and mode, multiplies it by the occurrence count, accumulates
1468 it into the cost specified by WHERE, and returns the cost added. */
1471 default_add_stmt_cost (class vec_info
*vinfo
, void *data
, int count
,
1472 enum vect_cost_for_stmt kind
,
1473 class _stmt_vec_info
*stmt_info
, tree vectype
,
1475 enum vect_cost_model_location where
)
1477 unsigned *cost
= (unsigned *) data
;
1478 unsigned retval
= 0;
1479 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1481 /* Statements in an inner loop relative to the loop being
1482 vectorized are weighted more heavily. The value here is
1483 arbitrary and could potentially be improved with analysis. */
1484 if (where
== vect_body
&& stmt_info
1485 && stmt_in_inner_loop_p (vinfo
, stmt_info
))
1487 loop_vec_info loop_vinfo
= dyn_cast
<loop_vec_info
> (vinfo
);
1488 gcc_assert (loop_vinfo
);
1489 count
*= LOOP_VINFO_INNER_LOOP_COST_FACTOR (loop_vinfo
);
1492 retval
= (unsigned) (count
* stmt_cost
);
1493 cost
[where
] += retval
;
1498 /* By default, the cost model just returns the accumulated costs. */
1501 default_finish_cost (void *data
, unsigned *prologue_cost
,
1502 unsigned *body_cost
, unsigned *epilogue_cost
)
1504 unsigned *cost
= (unsigned *) data
;
1505 *prologue_cost
= cost
[vect_prologue
];
1506 *body_cost
= cost
[vect_body
];
1507 *epilogue_cost
= cost
[vect_epilogue
];
1510 /* Free the cost data. */
1513 default_destroy_cost_data (void *data
)
1518 /* Determine whether or not a pointer mode is valid. Assume defaults
1519 of ptr_mode or Pmode - can be overridden. */
1521 default_valid_pointer_mode (scalar_int_mode mode
)
1523 return (mode
== ptr_mode
|| mode
== Pmode
);
1526 /* Determine whether the memory reference specified by REF may alias
1527 the C libraries errno location. */
1529 default_ref_may_alias_errno (ao_ref
*ref
)
1531 tree base
= ao_ref_base (ref
);
1532 /* The default implementation assumes the errno location is
1533 a declaration of type int or is always accessed via a
1534 pointer to int. We assume that accesses to errno are
1535 not deliberately obfuscated (even in conforming ways). */
1536 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1537 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1539 /* The default implementation assumes an errno location declaration
1540 is never defined in the current compilation unit and may not be
1541 aliased by a local variable. */
1543 && DECL_EXTERNAL (base
)
1544 && !TREE_STATIC (base
))
1546 else if (TREE_CODE (base
) == MEM_REF
1547 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1549 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1550 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1555 /* Return the mode for a pointer to a given ADDRSPACE,
1556 defaulting to ptr_mode for all address spaces. */
1559 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1564 /* Return the mode for an address in a given ADDRSPACE,
1565 defaulting to Pmode for all address spaces. */
1568 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1573 /* Named address space version of valid_pointer_mode.
1574 To match the above, the same modes apply to all address spaces. */
1577 default_addr_space_valid_pointer_mode (scalar_int_mode mode
,
1578 addr_space_t as ATTRIBUTE_UNUSED
)
1580 return targetm
.valid_pointer_mode (mode
);
1583 /* Some places still assume that all pointer or address modes are the
1584 standard Pmode and ptr_mode. These optimizations become invalid if
1585 the target actually supports multiple different modes. For now,
1586 we disable such optimizations on such targets, using this function. */
1589 target_default_pointer_address_modes_p (void)
1591 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1593 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1599 /* Named address space version of legitimate_address_p.
1600 By default, all address spaces have the same form. */
1603 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1605 addr_space_t as ATTRIBUTE_UNUSED
)
1607 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1610 /* Named address space version of LEGITIMIZE_ADDRESS.
1611 By default, all address spaces have the same form. */
1614 default_addr_space_legitimize_address (rtx x
, rtx oldx
, machine_mode mode
,
1615 addr_space_t as ATTRIBUTE_UNUSED
)
1617 return targetm
.legitimize_address (x
, oldx
, mode
);
1620 /* The default hook for determining if one named address space is a subset of
1621 another and to return which address space to use as the common address
1625 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1627 return (subset
== superset
);
1630 /* The default hook for determining if 0 within a named address
1631 space is a valid address. */
1634 default_addr_space_zero_address_valid (addr_space_t as ATTRIBUTE_UNUSED
)
1639 /* The default hook for debugging the address space is to return the
1640 address space number to indicate DW_AT_address_class. */
1642 default_addr_space_debug (addr_space_t as
)
1647 /* The default hook implementation for TARGET_ADDR_SPACE_DIAGNOSE_USAGE.
1648 Don't complain about any address space. */
1651 default_addr_space_diagnose_usage (addr_space_t
, location_t
)
1656 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1657 called for targets with only a generic address space. */
1660 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1661 tree from_type ATTRIBUTE_UNUSED
,
1662 tree to_type ATTRIBUTE_UNUSED
)
1667 /* The defualt implementation of TARGET_HARD_REGNO_NREGS. */
1670 default_hard_regno_nregs (unsigned int, machine_mode mode
)
1672 /* Targets with variable-sized modes must provide their own definition
1674 return CEIL (GET_MODE_SIZE (mode
).to_constant (), UNITS_PER_WORD
);
1678 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1683 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1686 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1687 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1692 extern bool default_new_address_profitable_p (rtx
, rtx
);
1695 /* The default implementation of TARGET_NEW_ADDRESS_PROFITABLE_P. */
1698 default_new_address_profitable_p (rtx memref ATTRIBUTE_UNUSED
,
1699 rtx_insn
*insn ATTRIBUTE_UNUSED
,
1700 rtx new_addr ATTRIBUTE_UNUSED
)
1706 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1707 tree
ARG_UNUSED (name
),
1708 tree
ARG_UNUSED (args
),
1709 int ARG_UNUSED (flags
))
1711 warning (OPT_Wattributes
,
1712 "target attribute is not supported on this machine");
1718 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1719 tree
ARG_UNUSED (pop_target
))
1721 /* If args is NULL the caller is handle_pragma_pop_options (). In that case,
1722 emit no warning because "#pragma GCC pop_target" is valid on targets that
1723 do not have the "target" pragma. */
1725 warning (OPT_Wpragmas
,
1726 "%<#pragma GCC target%> is not supported for this machine");
1732 default_target_can_inline_p (tree caller
, tree callee
)
1734 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1735 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1737 callee_opts
= target_option_default_node
;
1739 caller_opts
= target_option_default_node
;
1741 /* If both caller and callee have attributes, assume that if the
1742 pointer is different, the two functions have different target
1743 options since build_target_option_node uses a hash table for the
1745 return callee_opts
== caller_opts
;
1748 /* If the machine does not have a case insn that compares the bounds,
1749 this means extra overhead for dispatch tables, which raises the
1750 threshold for using them. */
1753 default_case_values_threshold (void)
1755 return (targetm
.have_casesi () ? 4 : 5);
1759 default_have_conditional_execution (void)
1761 return HAVE_conditional_execution
;
1764 /* By default we assume that c99 functions are present at the runtime,
1765 but sincos is not. */
1767 default_libc_has_function (enum function_class fn_class
,
1768 tree type ATTRIBUTE_UNUSED
)
1770 if (fn_class
== function_c94
1771 || fn_class
== function_c99_misc
1772 || fn_class
== function_c99_math_complex
)
1778 /* By default assume that libc has not a fast implementation. */
1781 default_libc_has_fast_function (int fcode ATTRIBUTE_UNUSED
)
1787 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
,
1788 tree type ATTRIBUTE_UNUSED
)
1794 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
,
1795 tree type ATTRIBUTE_UNUSED
)
1801 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1806 /* Compute cost of moving registers to/from memory. */
1809 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1810 reg_class_t rclass ATTRIBUTE_UNUSED
,
1811 bool in ATTRIBUTE_UNUSED
)
1813 #ifndef MEMORY_MOVE_COST
1814 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1816 return MEMORY_MOVE_COST (MACRO_MODE (mode
), (enum reg_class
) rclass
, in
);
1820 /* Compute cost of moving data from a register of class FROM to one of
1824 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1825 reg_class_t from ATTRIBUTE_UNUSED
,
1826 reg_class_t to ATTRIBUTE_UNUSED
)
1828 #ifndef REGISTER_MOVE_COST
1831 return REGISTER_MOVE_COST (MACRO_MODE (mode
),
1832 (enum reg_class
) from
, (enum reg_class
) to
);
1836 /* The default implementation of TARGET_SLOW_UNALIGNED_ACCESS. */
1839 default_slow_unaligned_access (machine_mode
, unsigned int)
1841 return STRICT_ALIGNMENT
;
1844 /* The default implementation of TARGET_ESTIMATED_POLY_VALUE. */
1847 default_estimated_poly_value (poly_int64 x
, poly_value_estimate_kind
)
1852 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1853 behavior. SPEED_P is true if we are compiling for speed. */
1856 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1858 unsigned int move_ratio
;
1860 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1862 #if defined (HAVE_cpymemqi) || defined (HAVE_cpymemhi) || defined (HAVE_cpymemsi) || defined (HAVE_cpymemdi) || defined (HAVE_cpymemti)
1864 #else /* No cpymem patterns, pick a default. */
1865 move_ratio
= ((speed_p
) ? 15 : 3);
1871 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1872 used; return FALSE if the cpymem/setmem optab should be expanded, or
1873 a call to memcpy emitted. */
1876 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size
,
1877 unsigned int alignment
,
1878 enum by_pieces_operation op
,
1881 unsigned int max_size
= 0;
1882 unsigned int ratio
= 0;
1886 case CLEAR_BY_PIECES
:
1887 max_size
= STORE_MAX_PIECES
;
1888 ratio
= CLEAR_RATIO (speed_p
);
1890 case MOVE_BY_PIECES
:
1891 max_size
= MOVE_MAX_PIECES
;
1892 ratio
= get_move_ratio (speed_p
);
1895 max_size
= STORE_MAX_PIECES
;
1896 ratio
= SET_RATIO (speed_p
);
1898 case STORE_BY_PIECES
:
1899 max_size
= STORE_MAX_PIECES
;
1900 ratio
= get_move_ratio (speed_p
);
1902 case COMPARE_BY_PIECES
:
1903 max_size
= COMPARE_MAX_PIECES
;
1904 /* Pick a likely default, just as in get_move_ratio. */
1905 ratio
= speed_p
? 15 : 3;
1909 return by_pieces_ninsns (size
, alignment
, max_size
+ 1, op
) < ratio
;
1912 /* This hook controls code generation for expanding a memcmp operation by
1913 pieces. Return 1 for the normal pattern of compare/jump after each pair
1914 of loads, or a higher number to reduce the number of branches. */
1917 default_compare_by_pieces_branch_ratio (machine_mode
)
1922 /* Helper for default_print_patchable_function_entry and other
1923 print_patchable_function_entry hook implementations. */
1926 default_print_patchable_function_entry_1 (FILE *file
,
1927 unsigned HOST_WIDE_INT
1932 const char *nop_templ
= 0;
1934 rtx_insn
*my_nop
= make_insn_raw (gen_nop ());
1936 /* We use the template alone, relying on the (currently sane) assumption
1937 that the NOP template does not have variable operands. */
1938 code_num
= recog_memoized (my_nop
);
1939 nop_templ
= get_insn_template (code_num
, my_nop
);
1941 if (record_p
&& targetm_common
.have_named_sections
)
1944 static int patch_area_number
;
1945 section
*previous_section
= in_section
;
1946 const char *asm_op
= integer_asm_op (POINTER_SIZE_UNITS
, false);
1948 gcc_assert (asm_op
!= NULL
);
1949 patch_area_number
++;
1950 ASM_GENERATE_INTERNAL_LABEL (buf
, "LPFE", patch_area_number
);
1952 switch_to_section (get_section ("__patchable_function_entries",
1953 flags
, current_function_decl
));
1954 assemble_align (POINTER_SIZE
);
1955 fputs (asm_op
, file
);
1956 assemble_name_raw (file
, buf
);
1959 switch_to_section (previous_section
);
1960 ASM_OUTPUT_LABEL (file
, buf
);
1964 for (i
= 0; i
< patch_area_size
; ++i
)
1965 output_asm_insn (nop_templ
, NULL
);
1968 /* Write PATCH_AREA_SIZE NOPs into the asm outfile FILE around a function
1969 entry. If RECORD_P is true and the target supports named sections,
1970 the location of the NOPs will be recorded in a special object section
1971 called "__patchable_function_entries". This routine may be called
1972 twice per function to put NOPs before and after the function
1976 default_print_patchable_function_entry (FILE *file
,
1977 unsigned HOST_WIDE_INT patch_area_size
,
1980 unsigned int flags
= SECTION_WRITE
| SECTION_RELRO
;
1981 if (HAVE_GAS_SECTION_LINK_ORDER
)
1982 flags
|= SECTION_LINK_ORDER
;
1983 default_print_patchable_function_entry_1 (file
, patch_area_size
, record_p
,
1988 default_profile_before_prologue (void)
1990 #ifdef PROFILE_BEFORE_PROLOGUE
1997 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
2000 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
2003 #ifdef PREFERRED_RELOAD_CLASS
2004 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
2010 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
2013 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
2019 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
2021 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
2026 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
2029 default_class_likely_spilled_p (reg_class_t rclass
)
2031 return (reg_class_size
[(int) rclass
] == 1);
2034 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
2037 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
2038 machine_mode mode ATTRIBUTE_UNUSED
)
2040 #ifdef CLASS_MAX_NREGS
2041 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
,
2044 /* Targets with variable-sized modes must provide their own definition
2046 unsigned int size
= GET_MODE_SIZE (mode
).to_constant ();
2047 return (size
+ UNITS_PER_WORD
- 1) / UNITS_PER_WORD
;
2051 /* Determine the debugging unwind mechanism for the target. */
2053 enum unwind_info_type
2054 default_debug_unwind_info (void)
2056 /* If the target wants to force the use of dwarf2 unwind info, let it. */
2057 /* ??? Change all users to the hook, then poison this. */
2058 #ifdef DWARF2_FRAME_INFO
2059 if (DWARF2_FRAME_INFO
)
2063 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
2064 #ifdef DWARF2_DEBUGGING_INFO
2065 if (dwarf_debuginfo_p ())
2072 /* Targets that set NUM_POLY_INT_COEFFS to something greater than 1
2073 must define this hook. */
2076 default_dwarf_poly_indeterminate_value (unsigned int, unsigned int *, int *)
2081 /* Determine the correct mode for a Dwarf frame register that represents
2085 default_dwarf_frame_reg_mode (int regno
)
2087 machine_mode save_mode
= reg_raw_mode
[regno
];
2089 if (targetm
.hard_regno_call_part_clobbered (eh_edge_abi
.id (),
2091 save_mode
= choose_hard_reg_mode (regno
, 1, &eh_edge_abi
);
2095 /* To be used by targets where reg_raw_mode doesn't return the right
2096 mode for registers used in apply_builtin_return and apply_builtin_arg. */
2099 default_get_reg_raw_mode (int regno
)
2101 /* Targets must override this hook if the underlying register is
2103 return as_a
<fixed_size_mode
> (reg_raw_mode
[regno
]);
2106 /* Return true if a leaf function should stay leaf even with profiling
2110 default_keep_leaf_when_profiled ()
2115 /* Return true if the state of option OPTION should be stored in PCH files
2116 and checked by default_pch_valid_p. Store the option's current state
2120 option_affects_pch_p (int option
, struct cl_option_state
*state
)
2122 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
2124 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
2126 if (option_flag_var (option
, &global_options
) == &target_flags
)
2127 if (targetm
.check_pch_target_flags
)
2129 return get_option_state (&global_options
, option
, state
);
2132 /* Default version of get_pch_validity.
2133 By default, every flag difference is fatal; that will be mostly right for
2134 most targets, but completely right for very few. */
2137 default_get_pch_validity (size_t *sz
)
2139 struct cl_option_state state
;
2144 if (targetm
.check_pch_target_flags
)
2145 *sz
+= sizeof (target_flags
);
2146 for (i
= 0; i
< cl_options_count
; i
++)
2147 if (option_affects_pch_p (i
, &state
))
2150 result
= r
= XNEWVEC (char, *sz
);
2154 if (targetm
.check_pch_target_flags
)
2156 memcpy (r
, &target_flags
, sizeof (target_flags
));
2157 r
+= sizeof (target_flags
);
2160 for (i
= 0; i
< cl_options_count
; i
++)
2161 if (option_affects_pch_p (i
, &state
))
2163 memcpy (r
, state
.data
, state
.size
);
2170 /* Return a message which says that a PCH file was created with a different
2171 setting of OPTION. */
2174 pch_option_mismatch (const char *option
)
2176 return xasprintf (_("created and used with differing settings of '%s'"),
2180 /* Default version of pch_valid_p. */
2183 default_pch_valid_p (const void *data_p
, size_t len
)
2185 struct cl_option_state state
;
2186 const char *data
= (const char *)data_p
;
2189 /* -fpic and -fpie also usually make a PCH invalid. */
2190 if (data
[0] != flag_pic
)
2191 return _("created and used with different settings of %<-fpic%>");
2192 if (data
[1] != flag_pie
)
2193 return _("created and used with different settings of %<-fpie%>");
2196 /* Check target_flags. */
2197 if (targetm
.check_pch_target_flags
)
2202 memcpy (&tf
, data
, sizeof (target_flags
));
2203 data
+= sizeof (target_flags
);
2204 len
-= sizeof (target_flags
);
2205 r
= targetm
.check_pch_target_flags (tf
);
2210 for (i
= 0; i
< cl_options_count
; i
++)
2211 if (option_affects_pch_p (i
, &state
))
2213 if (memcmp (data
, state
.data
, state
.size
) != 0)
2214 return pch_option_mismatch (cl_options
[i
].opt_text
);
2222 /* Default version of cstore_mode. */
2225 default_cstore_mode (enum insn_code icode
)
2227 return as_a
<scalar_int_mode
> (insn_data
[(int) icode
].operand
[0].mode
);
2230 /* Default version of member_type_forces_blk. */
2233 default_member_type_forces_blk (const_tree
, machine_mode
)
2239 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
2240 rtx ptr ATTRIBUTE_UNUSED
,
2241 rtx bnd ATTRIBUTE_UNUSED
)
2247 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
2248 rtx addr ATTRIBUTE_UNUSED
,
2249 rtx bounds ATTRIBUTE_UNUSED
,
2250 rtx to ATTRIBUTE_UNUSED
)
2256 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED
)
2262 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED
,
2263 rtx bounds ATTRIBUTE_UNUSED
)
2268 /* Default version of canonicalize_comparison. */
2271 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
2275 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
2278 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
2282 #ifndef PAD_VARARGS_DOWN
2283 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
2286 /* Build an indirect-ref expression over the given TREE, which represents a
2287 piece of a va_arg() expansion. */
2289 build_va_arg_indirect_ref (tree addr
)
2291 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
2295 /* The "standard" implementation of va_arg: read the value from the
2296 current (padded) address and increment by the (padded) size. */
2299 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
2302 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
2303 unsigned HOST_WIDE_INT align
, boundary
;
2306 /* All of the alignment and movement below is for args-grow-up machines.
2307 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
2308 implement their own specialized gimplify_va_arg_expr routines. */
2309 if (ARGS_GROW_DOWNWARD
)
2312 indirect
= pass_va_arg_by_reference (type
);
2314 type
= build_pointer_type (type
);
2316 if (targetm
.calls
.split_complex_arg
2317 && TREE_CODE (type
) == COMPLEX_TYPE
2318 && targetm
.calls
.split_complex_arg (type
))
2320 tree real_part
, imag_part
;
2322 real_part
= std_gimplify_va_arg_expr (valist
,
2323 TREE_TYPE (type
), pre_p
, NULL
);
2324 real_part
= get_initialized_tmp_var (real_part
, pre_p
);
2326 imag_part
= std_gimplify_va_arg_expr (unshare_expr (valist
),
2327 TREE_TYPE (type
), pre_p
, NULL
);
2328 imag_part
= get_initialized_tmp_var (imag_part
, pre_p
);
2330 return build2 (COMPLEX_EXPR
, type
, real_part
, imag_part
);
2333 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
2334 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
2336 /* When we align parameter on stack for caller, if the parameter
2337 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
2338 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
2339 here with caller. */
2340 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
2341 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
2343 boundary
/= BITS_PER_UNIT
;
2345 /* Hoist the valist value into a temporary for the moment. */
2346 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
);
2348 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
2349 requires greater alignment, we must perform dynamic alignment. */
2350 if (boundary
> align
2351 && !TYPE_EMPTY_P (type
)
2352 && !integer_zerop (TYPE_SIZE (type
)))
2354 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2355 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
2356 gimplify_and_add (t
, pre_p
);
2358 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
2359 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
2361 build_int_cst (TREE_TYPE (valist
), -boundary
)));
2362 gimplify_and_add (t
, pre_p
);
2367 /* If the actual alignment is less than the alignment of the type,
2368 adjust the type accordingly so that we don't assume strict alignment
2369 when dereferencing the pointer. */
2370 boundary
*= BITS_PER_UNIT
;
2371 if (boundary
< TYPE_ALIGN (type
))
2373 type
= build_variant_type_copy (type
);
2374 SET_TYPE_ALIGN (type
, boundary
);
2377 /* Compute the rounded size of the type. */
2378 type_size
= arg_size_in_bytes (type
);
2379 rounded_size
= round_up (type_size
, align
);
2381 /* Reduce rounded_size so it's sharable with the postqueue. */
2382 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
2386 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
2388 /* Small args are padded downward. */
2389 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
2390 rounded_size
, size_int (align
));
2391 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
2392 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
2393 addr
= fold_build_pointer_plus (addr
, t
);
2396 /* Compute new value for AP. */
2397 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
2398 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
2399 gimplify_and_add (t
, pre_p
);
2401 addr
= fold_convert (build_pointer_type (type
), addr
);
2404 addr
= build_va_arg_indirect_ref (addr
);
2406 return build_va_arg_indirect_ref (addr
);
2409 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
2410 not support nested low-overhead loops. */
2413 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
2414 unsigned int loop_depth
, bool)
2416 return loop_depth
== 1;
2419 /* Default implementation of TARGET_OPTAB_SUPPORTED_P. */
2422 default_optab_supported_p (int, machine_mode
, machine_mode
, optimization_type
)
2427 /* Default implementation of TARGET_MAX_NOCE_IFCVT_SEQ_COST. */
2430 default_max_noce_ifcvt_seq_cost (edge e
)
2432 bool predictable_p
= predictable_edge_p (e
);
2436 if (global_options_set
.x_param_max_rtl_if_conversion_predictable_cost
)
2437 return param_max_rtl_if_conversion_predictable_cost
;
2441 if (global_options_set
.x_param_max_rtl_if_conversion_unpredictable_cost
)
2442 return param_max_rtl_if_conversion_unpredictable_cost
;
2445 return BRANCH_COST (true, predictable_p
) * COSTS_N_INSNS (3);
2448 /* Default implementation of TARGET_MIN_ARITHMETIC_PRECISION. */
2451 default_min_arithmetic_precision (void)
2453 return WORD_REGISTER_OPERATIONS
? BITS_PER_WORD
: BITS_PER_UNIT
;
2456 /* Default implementation of TARGET_C_EXCESS_PRECISION. */
2458 enum flt_eval_method
2459 default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED
)
2461 return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT
;
2464 /* Default implementation for
2465 TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE. */
2467 default_stack_clash_protection_alloca_probe_range (void)
2472 /* The default implementation of TARGET_EARLY_REMAT_MODES. */
2475 default_select_early_remat_modes (sbitmap
)
2479 /* The default implementation of TARGET_PREFERRED_ELSE_VALUE. */
2482 default_preferred_else_value (unsigned, tree type
, unsigned, tree
*)
2484 return build_zero_cst (type
);
2487 /* Default implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE. */
2489 default_have_speculation_safe_value (bool active ATTRIBUTE_UNUSED
)
2491 #ifdef HAVE_speculation_barrier
2492 return active
? HAVE_speculation_barrier
: true;
2497 /* Alternative implementation of TARGET_HAVE_SPECULATION_SAFE_VALUE
2498 that can be used on targets that never have speculative execution. */
2500 speculation_safe_value_not_needed (bool active
)
2505 /* Default implementation of the speculation-safe-load builtin. This
2506 implementation simply copies val to result and generates a
2507 speculation_barrier insn, if such a pattern is defined. */
2509 default_speculation_safe_value (machine_mode mode ATTRIBUTE_UNUSED
,
2510 rtx result
, rtx val
,
2511 rtx failval ATTRIBUTE_UNUSED
)
2513 emit_move_insn (result
, val
);
2515 #ifdef HAVE_speculation_barrier
2516 /* Assume the target knows what it is doing: if it defines a
2517 speculation barrier, but it is not enabled, then assume that one
2519 if (HAVE_speculation_barrier
)
2520 emit_insn (gen_speculation_barrier ());
2526 /* How many bits to shift in order to access the tag bits.
2527 The default is to store the tag in the top 8 bits of a 64 bit pointer, hence
2528 shifting 56 bits will leave just the tag. */
2529 #define HWASAN_SHIFT (GET_MODE_PRECISION (Pmode) - 8)
2530 #define HWASAN_SHIFT_RTX GEN_INT (HWASAN_SHIFT)
2533 default_memtag_can_tag_addresses ()
2539 default_memtag_tag_size ()
2545 default_memtag_granule_size ()
2550 /* The default implementation of TARGET_MEMTAG_INSERT_RANDOM_TAG. */
2552 default_memtag_insert_random_tag (rtx untagged
, rtx target
)
2554 gcc_assert (param_hwasan_instrument_stack
);
2555 if (param_hwasan_random_frame_tag
)
2557 rtx fn
= init_one_libfunc ("__hwasan_generate_tag");
2558 rtx new_tag
= emit_library_call_value (fn
, NULL_RTX
, LCT_NORMAL
, QImode
);
2559 return targetm
.memtag
.set_tag (untagged
, new_tag
, target
);
2563 /* NOTE: The kernel API does not have __hwasan_generate_tag exposed.
2564 In the future we may add the option emit random tags with inline
2565 instrumentation instead of function calls. This would be the same
2566 between the kernel and userland. */
2571 /* The default implementation of TARGET_MEMTAG_ADD_TAG. */
2573 default_memtag_add_tag (rtx base
, poly_int64 offset
, uint8_t tag_offset
)
2575 /* Need to look into what the most efficient code sequence is.
2576 This is a code sequence that would be emitted *many* times, so we
2577 want it as small as possible.
2579 There are two places where tag overflow is a question:
2580 - Tagging the shadow stack.
2581 (both tagging and untagging).
2582 - Tagging addressable pointers.
2584 We need to ensure both behaviors are the same (i.e. that the tag that
2585 ends up in a pointer after "overflowing" the tag bits with a tag addition
2586 is the same that ends up in the shadow space).
2588 The aim is that the behavior of tag addition should follow modulo
2589 wrapping in both instances.
2591 The libhwasan code doesn't have any path that increments a pointer's tag,
2592 which means it has no opinion on what happens when a tag increment
2593 overflows (and hence we can choose our own behavior). */
2595 offset
+= ((uint64_t)tag_offset
<< HWASAN_SHIFT
);
2596 return plus_constant (Pmode
, base
, offset
);
2599 /* The default implementation of TARGET_MEMTAG_SET_TAG. */
2601 default_memtag_set_tag (rtx untagged
, rtx tag
, rtx target
)
2603 gcc_assert (GET_MODE (untagged
) == Pmode
&& GET_MODE (tag
) == QImode
);
2604 tag
= expand_simple_binop (Pmode
, ASHIFT
, tag
, HWASAN_SHIFT_RTX
, NULL_RTX
,
2605 /* unsignedp = */1, OPTAB_WIDEN
);
2606 rtx ret
= expand_simple_binop (Pmode
, IOR
, untagged
, tag
, target
,
2607 /* unsignedp = */1, OPTAB_DIRECT
);
2612 /* The default implementation of TARGET_MEMTAG_EXTRACT_TAG. */
2614 default_memtag_extract_tag (rtx tagged_pointer
, rtx target
)
2616 rtx tag
= expand_simple_binop (Pmode
, LSHIFTRT
, tagged_pointer
,
2617 HWASAN_SHIFT_RTX
, target
,
2620 rtx ret
= gen_lowpart (QImode
, tag
);
2625 /* The default implementation of TARGET_MEMTAG_UNTAGGED_POINTER. */
2627 default_memtag_untagged_pointer (rtx tagged_pointer
, rtx target
)
2629 rtx tag_mask
= gen_int_mode ((HOST_WIDE_INT_1U
<< HWASAN_SHIFT
) - 1, Pmode
);
2630 rtx untagged_base
= expand_simple_binop (Pmode
, AND
, tagged_pointer
,
2631 tag_mask
, target
, true,
2633 gcc_assert (untagged_base
);
2634 return untagged_base
;
2637 #include "gt-targhooks.h"