1 /* Default target hook functions.
2 Copyright (C) 2003-2013 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 "stor-layout.h"
60 #include "diagnostic-core.h"
64 #include "target-def.h"
66 #include "hard-reg-set.h"
75 #include "stringpool.h"
76 #include "tree-ssanames.h"
77 #include "tree-ssa-alias.h"
78 #include "insn-codes.h"
82 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED
,
83 rtx addr ATTRIBUTE_UNUSED
,
84 bool strict ATTRIBUTE_UNUSED
)
86 #ifdef GO_IF_LEGITIMATE_ADDRESS
87 /* Defer to the old implementation using a goto. */
89 return strict_memory_address_p (mode
, addr
);
91 return memory_address_p (mode
, addr
);
98 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
100 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
101 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
106 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
110 /* Any floating arithmetic may trap. */
111 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
114 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
116 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
124 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
125 enum machine_mode mode
,
126 int *punsignedp ATTRIBUTE_UNUSED
,
127 const_tree funtype ATTRIBUTE_UNUSED
,
128 int for_return ATTRIBUTE_UNUSED
)
130 if (type
!= NULL_TREE
&& for_return
== 2)
131 return promote_mode (type
, mode
, punsignedp
);
136 default_promote_function_mode_always_promote (const_tree type
,
137 enum machine_mode mode
,
139 const_tree funtype ATTRIBUTE_UNUSED
,
140 int for_return ATTRIBUTE_UNUSED
)
142 return promote_mode (type
, mode
, punsignedp
);
147 default_cc_modes_compatible (enum machine_mode m1
, enum machine_mode m2
)
155 default_return_in_memory (const_tree type
,
156 const_tree fntype ATTRIBUTE_UNUSED
)
158 return (TYPE_MODE (type
) == BLKmode
);
162 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
163 enum machine_mode mode ATTRIBUTE_UNUSED
)
169 default_expand_builtin_saveregs (void)
171 error ("__builtin_saveregs not supported by this target");
176 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED
,
177 enum machine_mode mode ATTRIBUTE_UNUSED
,
178 tree type ATTRIBUTE_UNUSED
,
179 int *pretend_arg_size ATTRIBUTE_UNUSED
,
180 int second_time ATTRIBUTE_UNUSED
)
184 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
187 default_builtin_setjmp_frame_value (void)
189 return virtual_stack_vars_rtx
;
192 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
195 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
201 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
203 return (targetm
.calls
.setup_incoming_varargs
204 != default_setup_incoming_varargs
);
208 default_eh_return_filter_mode (void)
210 return targetm
.unwind_word_mode ();
214 default_libgcc_cmp_return_mode (void)
220 default_libgcc_shift_count_mode (void)
226 default_unwind_word_mode (void)
231 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
233 unsigned HOST_WIDE_INT
234 default_shift_truncation_mask (enum machine_mode mode
)
236 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
239 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
242 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED
)
244 return have_insn_for (DIV
, mode
) ? 3 : 2;
247 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
250 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED
,
251 enum machine_mode mode_rep ATTRIBUTE_UNUSED
)
256 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
259 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
264 /* Return machine mode for non-standard suffix
265 or VOIDmode if non-standard suffixes are unsupported. */
267 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
272 /* The generic C++ ABI specifies this is a 64-bit value. */
274 default_cxx_guard_type (void)
276 return long_long_integer_type_node
;
279 /* Returns the size of the cookie to use when allocating an array
280 whose elements have the indicated TYPE. Assumes that it is already
281 known that a cookie is needed. */
284 default_cxx_get_cookie_size (tree type
)
288 /* We need to allocate an additional max (sizeof (size_t), alignof
289 (true_type)) bytes. */
293 sizetype_size
= size_in_bytes (sizetype
);
294 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
295 if (INT_CST_LT (type_align
, sizetype_size
))
296 cookie_size
= sizetype_size
;
298 cookie_size
= type_align
;
303 /* Return true if a parameter must be passed by reference. This version
304 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
307 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED
,
308 enum machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
309 bool named_arg ATTRIBUTE_UNUSED
)
311 return targetm
.calls
.must_pass_in_stack (mode
, type
);
314 /* Return true if a parameter follows callee copies conventions. This
315 version of the hook is true for all named arguments. */
318 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED
,
319 enum machine_mode mode ATTRIBUTE_UNUSED
,
320 const_tree type ATTRIBUTE_UNUSED
, bool named
)
325 /* Emit to STREAM the assembler syntax for insn operand X. */
328 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
329 int code ATTRIBUTE_UNUSED
)
332 PRINT_OPERAND (stream
, x
, code
);
338 /* Emit to STREAM the assembler syntax for an insn operand whose memory
342 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
343 rtx x ATTRIBUTE_UNUSED
)
345 #ifdef PRINT_OPERAND_ADDRESS
346 PRINT_OPERAND_ADDRESS (stream
, x
);
352 /* Return true if CODE is a valid punctuation character for the
353 `print_operand' hook. */
356 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
358 #ifdef PRINT_OPERAND_PUNCT_VALID_P
359 return PRINT_OPERAND_PUNCT_VALID_P (code
);
365 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
367 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
369 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
370 const char *stripped
= targetm
.strip_name_encoding (skipped
);
371 if (*name
!= '*' && user_label_prefix
[0])
372 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
373 return get_identifier (stripped
);
376 /* True if MODE is valid for the target. By "valid", we mean able to
377 be manipulated in non-trivial ways. In particular, this means all
378 the arithmetic is supported.
380 By default we guess this means that any C type is supported. If
381 we can't map the mode back to a type that would be available in C,
382 then reject it. Special case, here, is the double-word arithmetic
383 supported by optabs.c. */
386 default_scalar_mode_supported_p (enum machine_mode mode
)
388 int precision
= GET_MODE_PRECISION (mode
);
390 switch (GET_MODE_CLASS (mode
))
392 case MODE_PARTIAL_INT
:
394 if (precision
== CHAR_TYPE_SIZE
)
396 if (precision
== SHORT_TYPE_SIZE
)
398 if (precision
== INT_TYPE_SIZE
)
400 if (precision
== LONG_TYPE_SIZE
)
402 if (precision
== LONG_LONG_TYPE_SIZE
)
404 if (precision
== 2 * BITS_PER_WORD
)
409 if (precision
== FLOAT_TYPE_SIZE
)
411 if (precision
== DOUBLE_TYPE_SIZE
)
413 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
417 case MODE_DECIMAL_FLOAT
:
429 /* Make some target macros useable by target-independent code. */
431 targhook_words_big_endian (void)
433 return !!WORDS_BIG_ENDIAN
;
437 targhook_float_words_big_endian (void)
439 return !!FLOAT_WORDS_BIG_ENDIAN
;
442 /* True if the target supports floating-point exceptions and rounding
446 default_float_exceptions_rounding_supported_p (void)
455 /* True if the target supports decimal floating point. */
458 default_decimal_float_supported_p (void)
460 return ENABLE_DECIMAL_FLOAT
;
463 /* True if the target supports fixed-point arithmetic. */
466 default_fixed_point_supported_p (void)
468 return ENABLE_FIXED_POINT
;
471 /* True if the target supports GNU indirect functions. */
474 default_has_ifunc_p (void)
476 return HAVE_GNU_INDIRECT_FUNCTION
;
479 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
482 This function checks whether a given INSN is valid within a low-overhead
483 loop. If INSN is invalid it returns the reason for that, otherwise it
484 returns NULL. A called function may clobber any special registers required
485 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
486 register for branch on table instructions. We reject the doloop pattern in
490 default_invalid_within_doloop (const_rtx insn
)
493 return "Function call in loop.";
495 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
496 return "Computed branch in the loop.";
501 /* Mapping of builtin functions to vectorized variants. */
504 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
505 tree type_out ATTRIBUTE_UNUSED
,
506 tree type_in ATTRIBUTE_UNUSED
)
511 /* Vectorized conversion. */
514 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
515 tree dest_type ATTRIBUTE_UNUSED
,
516 tree src_type ATTRIBUTE_UNUSED
)
521 /* Default vectorizer cost model values. */
524 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
526 int misalign ATTRIBUTE_UNUSED
)
530 switch (type_of_cost
)
540 case cond_branch_not_taken
:
542 case vec_promote_demote
:
546 case unaligned_store
:
549 case cond_branch_taken
:
553 elements
= TYPE_VECTOR_SUBPARTS (vectype
);
554 return elements
/ 2 + 1;
564 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
565 bool md_fn ATTRIBUTE_UNUSED
,
566 bool sqrt ATTRIBUTE_UNUSED
)
572 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
573 cumulative_args_t ca ATTRIBUTE_UNUSED
,
574 enum machine_mode mode ATTRIBUTE_UNUSED
,
575 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
581 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
582 cumulative_args_t ca ATTRIBUTE_UNUSED
,
583 enum machine_mode mode ATTRIBUTE_UNUSED
,
584 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
590 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
591 cumulative_args_t ca ATTRIBUTE_UNUSED
,
592 enum machine_mode mode ATTRIBUTE_UNUSED
,
593 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
599 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
600 enum machine_mode mode ATTRIBUTE_UNUSED
,
601 const_tree type ATTRIBUTE_UNUSED
,
602 bool named ATTRIBUTE_UNUSED
)
608 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
609 enum machine_mode mode ATTRIBUTE_UNUSED
,
610 const_tree type ATTRIBUTE_UNUSED
,
611 bool named ATTRIBUTE_UNUSED
)
617 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
618 enum machine_mode mode ATTRIBUTE_UNUSED
,
619 const_tree type ATTRIBUTE_UNUSED
,
620 bool named ATTRIBUTE_UNUSED
)
626 default_function_arg_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
627 const_tree type ATTRIBUTE_UNUSED
)
629 return PARM_BOUNDARY
;
633 default_function_arg_round_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
634 const_tree type ATTRIBUTE_UNUSED
)
636 return PARM_BOUNDARY
;
640 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
645 hook_invalid_arg_for_unprototyped_fn (
646 const_tree typelist ATTRIBUTE_UNUSED
,
647 const_tree funcdecl ATTRIBUTE_UNUSED
,
648 const_tree val ATTRIBUTE_UNUSED
)
653 /* Initialize the stack protection decls. */
655 /* Stack protection related decls living in libgcc. */
656 static GTY(()) tree stack_chk_guard_decl
;
659 default_stack_protect_guard (void)
661 tree t
= stack_chk_guard_decl
;
667 t
= build_decl (UNKNOWN_LOCATION
,
668 VAR_DECL
, get_identifier ("__stack_chk_guard"),
672 DECL_EXTERNAL (t
) = 1;
674 TREE_THIS_VOLATILE (t
) = 1;
675 DECL_ARTIFICIAL (t
) = 1;
676 DECL_IGNORED_P (t
) = 1;
678 /* Do not share RTL as the declaration is visible outside of
681 RTX_FLAG (x
, used
) = 1;
683 stack_chk_guard_decl
= t
;
689 static GTY(()) tree stack_chk_fail_decl
;
692 default_external_stack_protect_fail (void)
694 tree t
= stack_chk_fail_decl
;
698 t
= build_function_type_list (void_type_node
, NULL_TREE
);
699 t
= build_decl (UNKNOWN_LOCATION
,
700 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
703 DECL_EXTERNAL (t
) = 1;
705 TREE_THIS_VOLATILE (t
) = 1;
706 TREE_NOTHROW (t
) = 1;
707 DECL_ARTIFICIAL (t
) = 1;
708 DECL_IGNORED_P (t
) = 1;
709 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
710 DECL_VISIBILITY_SPECIFIED (t
) = 1;
712 stack_chk_fail_decl
= t
;
715 return build_call_expr (t
, 0);
719 default_hidden_stack_protect_fail (void)
721 #ifndef HAVE_GAS_HIDDEN
722 return default_external_stack_protect_fail ();
724 tree t
= stack_chk_fail_decl
;
727 return default_external_stack_protect_fail ();
731 t
= build_function_type_list (void_type_node
, NULL_TREE
);
732 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
733 get_identifier ("__stack_chk_fail_local"), t
);
736 DECL_EXTERNAL (t
) = 1;
738 TREE_THIS_VOLATILE (t
) = 1;
739 TREE_NOTHROW (t
) = 1;
740 DECL_ARTIFICIAL (t
) = 1;
741 DECL_IGNORED_P (t
) = 1;
742 DECL_VISIBILITY_SPECIFIED (t
) = 1;
743 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
745 stack_chk_fail_decl
= t
;
748 return build_call_expr (t
, 0);
753 hook_bool_const_rtx_commutative_p (const_rtx x
,
754 int outer_code ATTRIBUTE_UNUSED
)
756 return COMMUTATIVE_P (x
);
760 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
761 const_tree fn_decl_or_type
,
762 bool outgoing ATTRIBUTE_UNUSED
)
764 /* The old interface doesn't handle receiving the function type. */
766 && !DECL_P (fn_decl_or_type
))
767 fn_decl_or_type
= NULL
;
769 #ifdef FUNCTION_VALUE
770 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
777 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED
,
778 const_rtx fun ATTRIBUTE_UNUSED
)
781 return LIBCALL_VALUE (mode
);
787 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
790 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
792 #ifdef FUNCTION_VALUE_REGNO_P
793 return FUNCTION_VALUE_REGNO_P (regno
);
800 default_internal_arg_pointer (void)
802 /* If the reg that the virtual arg pointer will be translated into is
803 not a fixed reg or is the stack pointer, make a copy of the virtual
804 arg pointer, and address parms via the copy. The frame pointer is
805 considered fixed even though it is not marked as such. */
806 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
807 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
808 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
809 return copy_to_reg (virtual_incoming_args_rtx
);
811 return virtual_incoming_args_rtx
;
815 default_static_chain (const_tree fndecl
, bool incoming_p
)
817 if (!DECL_STATIC_CHAIN (fndecl
))
822 #ifdef STATIC_CHAIN_INCOMING_REGNUM
823 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
827 #ifdef STATIC_CHAIN_REGNUM
828 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
832 static bool issued_error
;
836 sorry ("nested functions not supported on this target");
839 /* It really doesn't matter what we return here, so long at it
840 doesn't cause the rest of the compiler to crash. */
841 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
846 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
847 rtx
ARG_UNUSED (r_chain
))
849 sorry ("nested function trampolines not supported on this target");
853 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
854 tree funtype ATTRIBUTE_UNUSED
,
855 int size ATTRIBUTE_UNUSED
)
861 default_branch_target_register_class (void)
873 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
879 default_register_usage_leveling_p (void)
885 default_different_addr_displacement_p (void)
891 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
892 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
893 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
894 secondary_reload_info
*sri
)
896 enum reg_class rclass
= NO_REGS
;
897 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
899 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
901 sri
->icode
= sri
->prev_sri
->t_icode
;
904 #ifdef SECONDARY_INPUT_RELOAD_CLASS
906 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
908 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
910 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
912 if (rclass
!= NO_REGS
)
915 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
918 if (icode
!= CODE_FOR_nothing
919 && !insn_operand_matches (icode
, in_p
, x
))
920 icode
= CODE_FOR_nothing
;
921 else if (icode
!= CODE_FOR_nothing
)
923 const char *insn_constraint
, *scratch_constraint
;
924 char insn_letter
, scratch_letter
;
925 enum reg_class insn_class
, scratch_class
;
927 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
928 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
929 if (!*insn_constraint
)
930 insn_class
= ALL_REGS
;
935 gcc_assert (*insn_constraint
== '=');
938 insn_letter
= *insn_constraint
;
940 = (insn_letter
== 'r' ? GENERAL_REGS
941 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
943 gcc_assert (insn_class
!= NO_REGS
);
946 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
947 /* The scratch register's constraint must start with "=&",
948 except for an input reload, where only "=" is necessary,
949 and where it might be beneficial to re-use registers from
951 gcc_assert (scratch_constraint
[0] == '='
952 && (in_p
|| scratch_constraint
[1] == '&'));
953 scratch_constraint
++;
954 if (*scratch_constraint
== '&')
955 scratch_constraint
++;
956 scratch_letter
= *scratch_constraint
;
958 = (scratch_letter
== 'r' ? GENERAL_REGS
959 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
960 scratch_constraint
));
962 if (reg_class_subset_p (reload_class
, insn_class
))
964 gcc_assert (scratch_class
== rclass
);
971 if (rclass
== NO_REGS
)
974 sri
->t_icode
= icode
;
979 /* By default, if flag_pic is true, then neither local nor global relocs
980 should be placed in readonly memory. */
983 default_reloc_rw_mask (void)
985 return flag_pic
? 3 : 0;
988 /* By default, do no modification. */
989 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
995 /* Default to natural alignment for vector types. */
997 default_vector_alignment (const_tree type
)
999 return tree_to_shwi (TYPE_SIZE (type
));
1003 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
1008 /* Assuming that types whose size is > pointer-size are not guaranteed to be
1009 naturally aligned. */
1010 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
1013 /* Assuming that types whose size is <= pointer-size
1014 are naturally aligned. */
1018 /* By default, assume that a target supports any factor of misalignment
1019 memory access if it supports movmisalign patten.
1020 is_packed is true if the memory access is defined in a packed struct. */
1022 default_builtin_support_vector_misalignment (enum machine_mode mode
,
1030 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1035 /* By default, only attempt to parallelize bitwise operations, and
1036 possibly adds/subtracts using bit-twiddling. */
1039 default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED
)
1044 /* By default only the size derived from the preferred vector mode
1048 default_autovectorize_vector_sizes (void)
1053 /* By default, the cost model accumulates three separate costs (prologue,
1054 loop body, and epilogue) for a vectorized loop or block. So allocate an
1055 array of three unsigned ints, set it to zero, and return its address. */
1058 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1060 unsigned *cost
= XNEWVEC (unsigned, 3);
1061 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1065 /* By default, the cost model looks up the cost of the given statement
1066 kind and mode, multiplies it by the occurrence count, accumulates
1067 it into the cost specified by WHERE, and returns the cost added. */
1070 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1071 struct _stmt_vec_info
*stmt_info
, int misalign
,
1072 enum vect_cost_model_location where
)
1074 unsigned *cost
= (unsigned *) data
;
1075 unsigned retval
= 0;
1077 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1078 int stmt_cost
= default_builtin_vectorization_cost (kind
, vectype
,
1080 /* Statements in an inner loop relative to the loop being
1081 vectorized are weighted more heavily. The value here is
1082 arbitrary and could potentially be improved with analysis. */
1083 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1084 count
*= 50; /* FIXME. */
1086 retval
= (unsigned) (count
* stmt_cost
);
1087 cost
[where
] += retval
;
1092 /* By default, the cost model just returns the accumulated costs. */
1095 default_finish_cost (void *data
, unsigned *prologue_cost
,
1096 unsigned *body_cost
, unsigned *epilogue_cost
)
1098 unsigned *cost
= (unsigned *) data
;
1099 *prologue_cost
= cost
[vect_prologue
];
1100 *body_cost
= cost
[vect_body
];
1101 *epilogue_cost
= cost
[vect_epilogue
];
1104 /* Free the cost data. */
1107 default_destroy_cost_data (void *data
)
1112 /* Determine whether or not a pointer mode is valid. Assume defaults
1113 of ptr_mode or Pmode - can be overridden. */
1115 default_valid_pointer_mode (enum machine_mode mode
)
1117 return (mode
== ptr_mode
|| mode
== Pmode
);
1120 /* Determine whether the memory reference specified by REF may alias
1121 the C libraries errno location. */
1123 default_ref_may_alias_errno (ao_ref
*ref
)
1125 tree base
= ao_ref_base (ref
);
1126 /* The default implementation assumes the errno location is
1127 a declaration of type int or is always accessed via a
1128 pointer to int. We assume that accesses to errno are
1129 not deliberately obfuscated (even in conforming ways). */
1130 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1131 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1133 /* The default implementation assumes an errno location
1134 declaration is never defined in the current compilation unit. */
1136 && !TREE_STATIC (base
))
1138 else if (TREE_CODE (base
) == MEM_REF
1139 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1141 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1142 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1147 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1148 for the generic address space only. */
1151 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1153 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1157 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1158 for the generic address space only. */
1161 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1163 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1167 /* Named address space version of valid_pointer_mode. */
1170 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
1172 if (!ADDR_SPACE_GENERIC_P (as
))
1173 return (mode
== targetm
.addr_space
.pointer_mode (as
)
1174 || mode
== targetm
.addr_space
.address_mode (as
));
1176 return targetm
.valid_pointer_mode (mode
);
1179 /* Some places still assume that all pointer or address modes are the
1180 standard Pmode and ptr_mode. These optimizations become invalid if
1181 the target actually supports multiple different modes. For now,
1182 we disable such optimizations on such targets, using this function. */
1185 target_default_pointer_address_modes_p (void)
1187 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1189 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1195 /* Named address space version of legitimate_address_p. */
1198 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
1199 bool strict
, addr_space_t as
)
1201 if (!ADDR_SPACE_GENERIC_P (as
))
1204 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1207 /* Named address space version of LEGITIMIZE_ADDRESS. */
1210 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
1211 enum machine_mode mode
, addr_space_t as
)
1213 if (!ADDR_SPACE_GENERIC_P (as
))
1216 return targetm
.legitimize_address (x
, oldx
, mode
);
1219 /* The default hook for determining if one named address space is a subset of
1220 another and to return which address space to use as the common address
1224 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1226 return (subset
== superset
);
1229 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1230 called for targets with only a generic address space. */
1233 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1234 tree from_type ATTRIBUTE_UNUSED
,
1235 tree to_type ATTRIBUTE_UNUSED
)
1241 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1246 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1249 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1250 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1256 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1257 tree
ARG_UNUSED (name
),
1258 tree
ARG_UNUSED (args
),
1259 int ARG_UNUSED (flags
))
1261 warning (OPT_Wattributes
,
1262 "target attribute is not supported on this machine");
1268 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1269 tree
ARG_UNUSED (pop_target
))
1271 warning (OPT_Wpragmas
,
1272 "#pragma GCC target is not supported for this machine");
1278 default_target_can_inline_p (tree caller
, tree callee
)
1281 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1282 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1284 /* If callee has no option attributes, then it is ok to inline */
1288 /* If caller has no option attributes, but callee does then it is not ok to
1290 else if (!caller_opts
)
1293 /* If both caller and callee have attributes, assume that if the
1294 pointer is different, the two functions have different target
1295 options since build_target_option_node uses a hash table for the
1298 ret
= (callee_opts
== caller_opts
);
1304 # define HAVE_casesi 0
1307 /* If the machine does not have a case insn that compares the bounds,
1308 this means extra overhead for dispatch tables, which raises the
1309 threshold for using them. */
1312 default_case_values_threshold (void)
1314 return (HAVE_casesi
? 4 : 5);
1318 default_have_conditional_execution (void)
1320 #ifdef HAVE_conditional_execution
1321 return HAVE_conditional_execution
;
1328 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1333 /* Compute cost of moving registers to/from memory. */
1336 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1337 reg_class_t rclass ATTRIBUTE_UNUSED
,
1338 bool in ATTRIBUTE_UNUSED
)
1340 #ifndef MEMORY_MOVE_COST
1341 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1343 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1347 /* Compute cost of moving data from a register of class FROM to one of
1351 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1352 reg_class_t from ATTRIBUTE_UNUSED
,
1353 reg_class_t to ATTRIBUTE_UNUSED
)
1355 #ifndef REGISTER_MOVE_COST
1358 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1363 default_profile_before_prologue (void)
1365 #ifdef PROFILE_BEFORE_PROLOGUE
1372 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1375 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1378 #ifdef PREFERRED_RELOAD_CLASS
1379 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1385 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1388 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1394 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1396 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1401 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1404 default_class_likely_spilled_p (reg_class_t rclass
)
1406 return (reg_class_size
[(int) rclass
] == 1);
1409 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1412 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1413 enum machine_mode mode ATTRIBUTE_UNUSED
)
1415 #ifdef CLASS_MAX_NREGS
1416 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1418 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1422 /* Determine the debugging unwind mechanism for the target. */
1424 enum unwind_info_type
1425 default_debug_unwind_info (void)
1427 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1428 /* ??? Change all users to the hook, then poison this. */
1429 #ifdef DWARF2_FRAME_INFO
1430 if (DWARF2_FRAME_INFO
)
1434 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1435 #ifdef DWARF2_DEBUGGING_INFO
1436 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1443 /* To be used by targets where reg_raw_mode doesn't return the right
1444 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1447 default_get_reg_raw_mode (int regno
)
1449 return reg_raw_mode
[regno
];
1452 /* Return true if the state of option OPTION should be stored in PCH files
1453 and checked by default_pch_valid_p. Store the option's current state
1457 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1459 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1461 if (option_flag_var (option
, &global_options
) == &target_flags
)
1462 if (targetm
.check_pch_target_flags
)
1464 return get_option_state (&global_options
, option
, state
);
1467 /* Default version of get_pch_validity.
1468 By default, every flag difference is fatal; that will be mostly right for
1469 most targets, but completely right for very few. */
1472 default_get_pch_validity (size_t *sz
)
1474 struct cl_option_state state
;
1479 if (targetm
.check_pch_target_flags
)
1480 *sz
+= sizeof (target_flags
);
1481 for (i
= 0; i
< cl_options_count
; i
++)
1482 if (option_affects_pch_p (i
, &state
))
1485 result
= r
= XNEWVEC (char, *sz
);
1489 if (targetm
.check_pch_target_flags
)
1491 memcpy (r
, &target_flags
, sizeof (target_flags
));
1492 r
+= sizeof (target_flags
);
1495 for (i
= 0; i
< cl_options_count
; i
++)
1496 if (option_affects_pch_p (i
, &state
))
1498 memcpy (r
, state
.data
, state
.size
);
1505 /* Return a message which says that a PCH file was created with a different
1506 setting of OPTION. */
1509 pch_option_mismatch (const char *option
)
1513 asprintf (&r
, _("created and used with differing settings of '%s'"), option
);
1515 return _("out of memory");
1519 /* Default version of pch_valid_p. */
1522 default_pch_valid_p (const void *data_p
, size_t len
)
1524 struct cl_option_state state
;
1525 const char *data
= (const char *)data_p
;
1528 /* -fpic and -fpie also usually make a PCH invalid. */
1529 if (data
[0] != flag_pic
)
1530 return _("created and used with different settings of -fpic");
1531 if (data
[1] != flag_pie
)
1532 return _("created and used with different settings of -fpie");
1535 /* Check target_flags. */
1536 if (targetm
.check_pch_target_flags
)
1541 memcpy (&tf
, data
, sizeof (target_flags
));
1542 data
+= sizeof (target_flags
);
1543 len
-= sizeof (target_flags
);
1544 r
= targetm
.check_pch_target_flags (tf
);
1549 for (i
= 0; i
< cl_options_count
; i
++)
1550 if (option_affects_pch_p (i
, &state
))
1552 if (memcmp (data
, state
.data
, state
.size
) != 0)
1553 return pch_option_mismatch (cl_options
[i
].opt_text
);
1561 /* Default version of cstore_mode. */
1564 default_cstore_mode (enum insn_code icode
)
1566 return insn_data
[(int) icode
].operand
[0].mode
;
1569 /* Default version of member_type_forces_blk. */
1572 default_member_type_forces_blk (const_tree
, enum machine_mode
)
1577 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
1578 rtx ptr ATTRIBUTE_UNUSED
,
1579 rtx bnd ATTRIBUTE_UNUSED
)
1585 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
1586 rtx addr ATTRIBUTE_UNUSED
,
1587 rtx bounds ATTRIBUTE_UNUSED
,
1588 rtx to ATTRIBUTE_UNUSED
)
1594 default_fn_abi_va_list_bounds_size (tree fndecl ATTRIBUTE_UNUSED
)
1596 return integer_zero_node
;
1599 /* Default version of canonicalize_comparison. */
1602 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1606 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
1609 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
1613 #ifndef PAD_VARARGS_DOWN
1614 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
1617 /* Build an indirect-ref expression over the given TREE, which represents a
1618 piece of a va_arg() expansion. */
1620 build_va_arg_indirect_ref (tree addr
)
1622 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
1626 /* The "standard" implementation of va_arg: read the value from the
1627 current (padded) address and increment by the (padded) size. */
1630 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
1633 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
1634 unsigned HOST_WIDE_INT align
, boundary
;
1637 #ifdef ARGS_GROW_DOWNWARD
1638 /* All of the alignment and movement below is for args-grow-up machines.
1639 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
1640 implement their own specialized gimplify_va_arg_expr routines. */
1644 indirect
= pass_by_reference (NULL
, TYPE_MODE (type
), type
, false);
1646 type
= build_pointer_type (type
);
1648 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
1649 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
1651 /* When we align parameter on stack for caller, if the parameter
1652 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
1653 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
1654 here with caller. */
1655 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
1656 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
1658 boundary
/= BITS_PER_UNIT
;
1660 /* Hoist the valist value into a temporary for the moment. */
1661 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
1663 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
1664 requires greater alignment, we must perform dynamic alignment. */
1665 if (boundary
> align
1666 && !integer_zerop (TYPE_SIZE (type
)))
1668 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1669 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
1670 gimplify_and_add (t
, pre_p
);
1672 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1673 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
1675 build_int_cst (TREE_TYPE (valist
), -boundary
)));
1676 gimplify_and_add (t
, pre_p
);
1681 /* If the actual alignment is less than the alignment of the type,
1682 adjust the type accordingly so that we don't assume strict alignment
1683 when dereferencing the pointer. */
1684 boundary
*= BITS_PER_UNIT
;
1685 if (boundary
< TYPE_ALIGN (type
))
1687 type
= build_variant_type_copy (type
);
1688 TYPE_ALIGN (type
) = boundary
;
1691 /* Compute the rounded size of the type. */
1692 type_size
= size_in_bytes (type
);
1693 rounded_size
= round_up (type_size
, align
);
1695 /* Reduce rounded_size so it's sharable with the postqueue. */
1696 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
1700 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
1702 /* Small args are padded downward. */
1703 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
1704 rounded_size
, size_int (align
));
1705 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
1706 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
1707 addr
= fold_build_pointer_plus (addr
, t
);
1710 /* Compute new value for AP. */
1711 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
1712 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
1713 gimplify_and_add (t
, pre_p
);
1715 addr
= fold_convert (build_pointer_type (type
), addr
);
1718 addr
= build_va_arg_indirect_ref (addr
);
1720 return build_va_arg_indirect_ref (addr
);
1724 default_chkp_bound_type (void)
1726 tree res
= make_node (POINTER_BOUNDS_TYPE
);
1727 TYPE_PRECISION (res
) = TYPE_PRECISION (size_type_node
) * 2;
1733 default_chkp_bound_mode (void)
1739 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED
)
1744 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
1745 not support nested low-overhead loops. */
1748 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
1749 unsigned int loop_depth
, bool)
1751 return loop_depth
== 1;
1754 #include "gt-targhooks.h"