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"
58 #include "diagnostic-core.h"
62 #include "target-def.h"
64 #include "hard-reg-set.h"
72 #include "tree-ssanames.h"
73 #include "tree-ssa-alias.h"
74 #include "insn-codes.h"
78 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED
,
79 rtx addr ATTRIBUTE_UNUSED
,
80 bool strict ATTRIBUTE_UNUSED
)
82 #ifdef GO_IF_LEGITIMATE_ADDRESS
83 /* Defer to the old implementation using a goto. */
85 return strict_memory_address_p (mode
, addr
);
87 return memory_address_p (mode
, addr
);
94 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
96 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
97 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
102 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
106 /* Any floating arithmetic may trap. */
107 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
110 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
112 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
120 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
121 enum machine_mode mode
,
122 int *punsignedp ATTRIBUTE_UNUSED
,
123 const_tree funtype ATTRIBUTE_UNUSED
,
124 int for_return ATTRIBUTE_UNUSED
)
126 if (type
!= NULL_TREE
&& for_return
== 2)
127 return promote_mode (type
, mode
, punsignedp
);
132 default_promote_function_mode_always_promote (const_tree type
,
133 enum machine_mode mode
,
135 const_tree funtype ATTRIBUTE_UNUSED
,
136 int for_return ATTRIBUTE_UNUSED
)
138 return promote_mode (type
, mode
, punsignedp
);
143 default_cc_modes_compatible (enum machine_mode m1
, enum machine_mode m2
)
151 default_return_in_memory (const_tree type
,
152 const_tree fntype ATTRIBUTE_UNUSED
)
154 return (TYPE_MODE (type
) == BLKmode
);
158 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
159 enum machine_mode mode ATTRIBUTE_UNUSED
)
165 default_expand_builtin_saveregs (void)
167 error ("__builtin_saveregs not supported by this target");
172 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED
,
173 enum machine_mode mode ATTRIBUTE_UNUSED
,
174 tree type ATTRIBUTE_UNUSED
,
175 int *pretend_arg_size ATTRIBUTE_UNUSED
,
176 int second_time ATTRIBUTE_UNUSED
)
180 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
183 default_builtin_setjmp_frame_value (void)
185 return virtual_stack_vars_rtx
;
188 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
191 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
197 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
199 return (targetm
.calls
.setup_incoming_varargs
200 != default_setup_incoming_varargs
);
204 default_eh_return_filter_mode (void)
206 return targetm
.unwind_word_mode ();
210 default_libgcc_cmp_return_mode (void)
216 default_libgcc_shift_count_mode (void)
222 default_unwind_word_mode (void)
227 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
229 unsigned HOST_WIDE_INT
230 default_shift_truncation_mask (enum machine_mode mode
)
232 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
235 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
238 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED
)
240 return have_insn_for (DIV
, mode
) ? 3 : 2;
243 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
246 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED
,
247 enum machine_mode mode_rep ATTRIBUTE_UNUSED
)
252 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
255 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
260 /* Return machine mode for non-standard suffix
261 or VOIDmode if non-standard suffixes are unsupported. */
263 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
268 /* The generic C++ ABI specifies this is a 64-bit value. */
270 default_cxx_guard_type (void)
272 return long_long_integer_type_node
;
276 /* Returns the size of the cookie to use when allocating an array
277 whose elements have the indicated TYPE. Assumes that it is already
278 known that a cookie is needed. */
281 default_cxx_get_cookie_size (tree type
)
285 /* We need to allocate an additional max (sizeof (size_t), alignof
286 (true_type)) bytes. */
290 sizetype_size
= size_in_bytes (sizetype
);
291 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
292 if (INT_CST_LT_UNSIGNED (type_align
, sizetype_size
))
293 cookie_size
= sizetype_size
;
295 cookie_size
= type_align
;
300 /* Return true if a parameter must be passed by reference. This version
301 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
304 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED
,
305 enum machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
306 bool named_arg ATTRIBUTE_UNUSED
)
308 return targetm
.calls
.must_pass_in_stack (mode
, type
);
311 /* Return true if a parameter follows callee copies conventions. This
312 version of the hook is true for all named arguments. */
315 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED
,
316 enum machine_mode mode ATTRIBUTE_UNUSED
,
317 const_tree type ATTRIBUTE_UNUSED
, bool named
)
322 /* Emit to STREAM the assembler syntax for insn operand X. */
325 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
326 int code ATTRIBUTE_UNUSED
)
329 PRINT_OPERAND (stream
, x
, code
);
335 /* Emit to STREAM the assembler syntax for an insn operand whose memory
339 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
340 rtx x ATTRIBUTE_UNUSED
)
342 #ifdef PRINT_OPERAND_ADDRESS
343 PRINT_OPERAND_ADDRESS (stream
, x
);
349 /* Return true if CODE is a valid punctuation character for the
350 `print_operand' hook. */
353 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
355 #ifdef PRINT_OPERAND_PUNCT_VALID_P
356 return PRINT_OPERAND_PUNCT_VALID_P (code
);
362 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
364 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
366 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
367 const char *stripped
= targetm
.strip_name_encoding (skipped
);
368 if (*name
!= '*' && user_label_prefix
[0])
369 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
370 return get_identifier (stripped
);
373 /* True if MODE is valid for the target. By "valid", we mean able to
374 be manipulated in non-trivial ways. In particular, this means all
375 the arithmetic is supported.
377 By default we guess this means that any C type is supported. If
378 we can't map the mode back to a type that would be available in C,
379 then reject it. Special case, here, is the double-word arithmetic
380 supported by optabs.c. */
383 default_scalar_mode_supported_p (enum machine_mode mode
)
385 int precision
= GET_MODE_PRECISION (mode
);
387 switch (GET_MODE_CLASS (mode
))
389 case MODE_PARTIAL_INT
:
391 if (precision
== CHAR_TYPE_SIZE
)
393 if (precision
== SHORT_TYPE_SIZE
)
395 if (precision
== INT_TYPE_SIZE
)
397 if (precision
== LONG_TYPE_SIZE
)
399 if (precision
== LONG_LONG_TYPE_SIZE
)
401 if (precision
== 2 * BITS_PER_WORD
)
406 if (precision
== FLOAT_TYPE_SIZE
)
408 if (precision
== DOUBLE_TYPE_SIZE
)
410 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
414 case MODE_DECIMAL_FLOAT
:
426 /* Make some target macros useable by target-independent code. */
428 targhook_words_big_endian (void)
430 return !!WORDS_BIG_ENDIAN
;
434 targhook_float_words_big_endian (void)
436 return !!FLOAT_WORDS_BIG_ENDIAN
;
439 /* True if the target supports decimal floating point. */
442 default_decimal_float_supported_p (void)
444 return ENABLE_DECIMAL_FLOAT
;
447 /* True if the target supports fixed-point arithmetic. */
450 default_fixed_point_supported_p (void)
452 return ENABLE_FIXED_POINT
;
455 /* True if the target supports GNU indirect functions. */
458 default_has_ifunc_p (void)
460 return HAVE_GNU_INDIRECT_FUNCTION
;
463 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
466 This function checks whether a given INSN is valid within a low-overhead
467 loop. If INSN is invalid it returns the reason for that, otherwise it
468 returns NULL. A called function may clobber any special registers required
469 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
470 register for branch on table instructions. We reject the doloop pattern in
474 default_invalid_within_doloop (const_rtx insn
)
477 return "Function call in loop.";
479 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
480 return "Computed branch in the loop.";
485 /* Mapping of builtin functions to vectorized variants. */
488 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
489 tree type_out ATTRIBUTE_UNUSED
,
490 tree type_in ATTRIBUTE_UNUSED
)
495 /* Vectorized conversion. */
498 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
499 tree dest_type ATTRIBUTE_UNUSED
,
500 tree src_type ATTRIBUTE_UNUSED
)
505 /* Default vectorizer cost model values. */
508 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
510 int misalign ATTRIBUTE_UNUSED
)
514 switch (type_of_cost
)
524 case cond_branch_not_taken
:
526 case vec_promote_demote
:
530 case unaligned_store
:
533 case cond_branch_taken
:
537 elements
= TYPE_VECTOR_SUBPARTS (vectype
);
538 return elements
/ 2 + 1;
548 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
549 bool md_fn ATTRIBUTE_UNUSED
,
550 bool sqrt ATTRIBUTE_UNUSED
)
556 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
557 cumulative_args_t ca ATTRIBUTE_UNUSED
,
558 enum machine_mode mode ATTRIBUTE_UNUSED
,
559 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
565 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
566 cumulative_args_t ca ATTRIBUTE_UNUSED
,
567 enum machine_mode mode ATTRIBUTE_UNUSED
,
568 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
574 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
575 cumulative_args_t ca ATTRIBUTE_UNUSED
,
576 enum machine_mode mode ATTRIBUTE_UNUSED
,
577 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
583 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
584 enum machine_mode mode ATTRIBUTE_UNUSED
,
585 const_tree type ATTRIBUTE_UNUSED
,
586 bool named ATTRIBUTE_UNUSED
)
592 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
593 enum machine_mode mode ATTRIBUTE_UNUSED
,
594 const_tree type ATTRIBUTE_UNUSED
,
595 bool named ATTRIBUTE_UNUSED
)
601 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
602 enum machine_mode mode ATTRIBUTE_UNUSED
,
603 const_tree type ATTRIBUTE_UNUSED
,
604 bool named ATTRIBUTE_UNUSED
)
610 default_function_arg_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
611 const_tree type ATTRIBUTE_UNUSED
)
613 return PARM_BOUNDARY
;
617 default_function_arg_round_boundary (enum machine_mode mode ATTRIBUTE_UNUSED
,
618 const_tree type ATTRIBUTE_UNUSED
)
620 return PARM_BOUNDARY
;
624 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
629 hook_invalid_arg_for_unprototyped_fn (
630 const_tree typelist ATTRIBUTE_UNUSED
,
631 const_tree funcdecl ATTRIBUTE_UNUSED
,
632 const_tree val ATTRIBUTE_UNUSED
)
637 /* Initialize the stack protection decls. */
639 /* Stack protection related decls living in libgcc. */
640 static GTY(()) tree stack_chk_guard_decl
;
643 default_stack_protect_guard (void)
645 tree t
= stack_chk_guard_decl
;
651 t
= build_decl (UNKNOWN_LOCATION
,
652 VAR_DECL
, get_identifier ("__stack_chk_guard"),
656 DECL_EXTERNAL (t
) = 1;
658 TREE_THIS_VOLATILE (t
) = 1;
659 DECL_ARTIFICIAL (t
) = 1;
660 DECL_IGNORED_P (t
) = 1;
662 /* Do not share RTL as the declaration is visible outside of
665 RTX_FLAG (x
, used
) = 1;
667 stack_chk_guard_decl
= t
;
673 static GTY(()) tree stack_chk_fail_decl
;
676 default_external_stack_protect_fail (void)
678 tree t
= stack_chk_fail_decl
;
682 t
= build_function_type_list (void_type_node
, NULL_TREE
);
683 t
= build_decl (UNKNOWN_LOCATION
,
684 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
687 DECL_EXTERNAL (t
) = 1;
689 TREE_THIS_VOLATILE (t
) = 1;
690 TREE_NOTHROW (t
) = 1;
691 DECL_ARTIFICIAL (t
) = 1;
692 DECL_IGNORED_P (t
) = 1;
693 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
694 DECL_VISIBILITY_SPECIFIED (t
) = 1;
696 stack_chk_fail_decl
= t
;
699 return build_call_expr (t
, 0);
703 default_hidden_stack_protect_fail (void)
705 #ifndef HAVE_GAS_HIDDEN
706 return default_external_stack_protect_fail ();
708 tree t
= stack_chk_fail_decl
;
711 return default_external_stack_protect_fail ();
715 t
= build_function_type_list (void_type_node
, NULL_TREE
);
716 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
717 get_identifier ("__stack_chk_fail_local"), t
);
720 DECL_EXTERNAL (t
) = 1;
722 TREE_THIS_VOLATILE (t
) = 1;
723 TREE_NOTHROW (t
) = 1;
724 DECL_ARTIFICIAL (t
) = 1;
725 DECL_IGNORED_P (t
) = 1;
726 DECL_VISIBILITY_SPECIFIED (t
) = 1;
727 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
729 stack_chk_fail_decl
= t
;
732 return build_call_expr (t
, 0);
737 hook_bool_const_rtx_commutative_p (const_rtx x
,
738 int outer_code ATTRIBUTE_UNUSED
)
740 return COMMUTATIVE_P (x
);
744 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
745 const_tree fn_decl_or_type
,
746 bool outgoing ATTRIBUTE_UNUSED
)
748 /* The old interface doesn't handle receiving the function type. */
750 && !DECL_P (fn_decl_or_type
))
751 fn_decl_or_type
= NULL
;
753 #ifdef FUNCTION_VALUE
754 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
761 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED
,
762 const_rtx fun ATTRIBUTE_UNUSED
)
765 return LIBCALL_VALUE (mode
);
771 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
774 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
776 #ifdef FUNCTION_VALUE_REGNO_P
777 return FUNCTION_VALUE_REGNO_P (regno
);
784 default_internal_arg_pointer (void)
786 /* If the reg that the virtual arg pointer will be translated into is
787 not a fixed reg or is the stack pointer, make a copy of the virtual
788 arg pointer, and address parms via the copy. The frame pointer is
789 considered fixed even though it is not marked as such. */
790 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
791 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
792 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
793 return copy_to_reg (virtual_incoming_args_rtx
);
795 return virtual_incoming_args_rtx
;
799 default_static_chain (const_tree fndecl
, bool incoming_p
)
801 if (!DECL_STATIC_CHAIN (fndecl
))
806 #ifdef STATIC_CHAIN_INCOMING_REGNUM
807 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
811 #ifdef STATIC_CHAIN_REGNUM
812 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
816 static bool issued_error
;
820 sorry ("nested functions not supported on this target");
823 /* It really doesn't matter what we return here, so long at it
824 doesn't cause the rest of the compiler to crash. */
825 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
830 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
831 rtx
ARG_UNUSED (r_chain
))
833 sorry ("nested function trampolines not supported on this target");
837 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
838 tree funtype ATTRIBUTE_UNUSED
,
839 int size ATTRIBUTE_UNUSED
)
845 default_branch_target_register_class (void)
857 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
863 default_register_usage_leveling_p (void)
869 default_different_addr_displacement_p (void)
875 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
876 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
877 enum machine_mode reload_mode ATTRIBUTE_UNUSED
,
878 secondary_reload_info
*sri
)
880 enum reg_class rclass
= NO_REGS
;
881 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
883 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
885 sri
->icode
= sri
->prev_sri
->t_icode
;
888 #ifdef SECONDARY_INPUT_RELOAD_CLASS
890 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
892 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
894 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
896 if (rclass
!= NO_REGS
)
899 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
902 if (icode
!= CODE_FOR_nothing
903 && !insn_operand_matches (icode
, in_p
, x
))
904 icode
= CODE_FOR_nothing
;
905 else if (icode
!= CODE_FOR_nothing
)
907 const char *insn_constraint
, *scratch_constraint
;
908 char insn_letter
, scratch_letter
;
909 enum reg_class insn_class
, scratch_class
;
911 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
912 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
913 if (!*insn_constraint
)
914 insn_class
= ALL_REGS
;
919 gcc_assert (*insn_constraint
== '=');
922 insn_letter
= *insn_constraint
;
924 = (insn_letter
== 'r' ? GENERAL_REGS
925 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter
,
927 gcc_assert (insn_class
!= NO_REGS
);
930 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
931 /* The scratch register's constraint must start with "=&",
932 except for an input reload, where only "=" is necessary,
933 and where it might be beneficial to re-use registers from
935 gcc_assert (scratch_constraint
[0] == '='
936 && (in_p
|| scratch_constraint
[1] == '&'));
937 scratch_constraint
++;
938 if (*scratch_constraint
== '&')
939 scratch_constraint
++;
940 scratch_letter
= *scratch_constraint
;
942 = (scratch_letter
== 'r' ? GENERAL_REGS
943 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter
,
944 scratch_constraint
));
946 if (reg_class_subset_p (reload_class
, insn_class
))
948 gcc_assert (scratch_class
== rclass
);
955 if (rclass
== NO_REGS
)
958 sri
->t_icode
= icode
;
963 /* By default, if flag_pic is true, then neither local nor global relocs
964 should be placed in readonly memory. */
967 default_reloc_rw_mask (void)
969 return flag_pic
? 3 : 0;
972 /* By default, do no modification. */
973 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
979 /* Default to natural alignment for vector types. */
981 default_vector_alignment (const_tree type
)
983 return tree_low_cst (TYPE_SIZE (type
), 0);
987 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
992 /* Assuming that types whose size is > pointer-size are not guaranteed to be
993 naturally aligned. */
994 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
997 /* Assuming that types whose size is <= pointer-size
998 are naturally aligned. */
1002 /* By default, assume that a target supports any factor of misalignment
1003 memory access if it supports movmisalign patten.
1004 is_packed is true if the memory access is defined in a packed struct. */
1006 default_builtin_support_vector_misalignment (enum machine_mode mode
,
1014 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1019 /* By default, only attempt to parallelize bitwise operations, and
1020 possibly adds/subtracts using bit-twiddling. */
1023 default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED
)
1028 /* By default only the size derived from the preferred vector mode
1032 default_autovectorize_vector_sizes (void)
1037 /* By default, the cost model accumulates three separate costs (prologue,
1038 loop body, and epilogue) for a vectorized loop or block. So allocate an
1039 array of three unsigned ints, set it to zero, and return its address. */
1042 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1044 unsigned *cost
= XNEWVEC (unsigned, 3);
1045 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1049 /* By default, the cost model looks up the cost of the given statement
1050 kind and mode, multiplies it by the occurrence count, accumulates
1051 it into the cost specified by WHERE, and returns the cost added. */
1054 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1055 struct _stmt_vec_info
*stmt_info
, int misalign
,
1056 enum vect_cost_model_location where
)
1058 unsigned *cost
= (unsigned *) data
;
1059 unsigned retval
= 0;
1061 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1062 int stmt_cost
= default_builtin_vectorization_cost (kind
, vectype
,
1064 /* Statements in an inner loop relative to the loop being
1065 vectorized are weighted more heavily. The value here is
1066 arbitrary and could potentially be improved with analysis. */
1067 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1068 count
*= 50; /* FIXME. */
1070 retval
= (unsigned) (count
* stmt_cost
);
1071 cost
[where
] += retval
;
1076 /* By default, the cost model just returns the accumulated costs. */
1079 default_finish_cost (void *data
, unsigned *prologue_cost
,
1080 unsigned *body_cost
, unsigned *epilogue_cost
)
1082 unsigned *cost
= (unsigned *) data
;
1083 *prologue_cost
= cost
[vect_prologue
];
1084 *body_cost
= cost
[vect_body
];
1085 *epilogue_cost
= cost
[vect_epilogue
];
1088 /* Free the cost data. */
1091 default_destroy_cost_data (void *data
)
1096 /* Determine whether or not a pointer mode is valid. Assume defaults
1097 of ptr_mode or Pmode - can be overridden. */
1099 default_valid_pointer_mode (enum machine_mode mode
)
1101 return (mode
== ptr_mode
|| mode
== Pmode
);
1104 /* Determine whether the memory reference specified by REF may alias
1105 the C libraries errno location. */
1107 default_ref_may_alias_errno (ao_ref
*ref
)
1109 tree base
= ao_ref_base (ref
);
1110 /* The default implementation assumes the errno location is
1111 a declaration of type int or is always accessed via a
1112 pointer to int. We assume that accesses to errno are
1113 not deliberately obfuscated (even in conforming ways). */
1114 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1115 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1117 /* The default implementation assumes an errno location
1118 declaration is never defined in the current compilation unit. */
1120 && !TREE_STATIC (base
))
1122 else if (TREE_CODE (base
) == MEM_REF
1123 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1125 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1126 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1131 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1132 for the generic address space only. */
1135 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1137 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1141 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1142 for the generic address space only. */
1145 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1147 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1151 /* Named address space version of valid_pointer_mode. */
1154 default_addr_space_valid_pointer_mode (enum machine_mode mode
, addr_space_t as
)
1156 if (!ADDR_SPACE_GENERIC_P (as
))
1157 return (mode
== targetm
.addr_space
.pointer_mode (as
)
1158 || mode
== targetm
.addr_space
.address_mode (as
));
1160 return targetm
.valid_pointer_mode (mode
);
1163 /* Some places still assume that all pointer or address modes are the
1164 standard Pmode and ptr_mode. These optimizations become invalid if
1165 the target actually supports multiple different modes. For now,
1166 we disable such optimizations on such targets, using this function. */
1169 target_default_pointer_address_modes_p (void)
1171 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1173 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1179 /* Named address space version of legitimate_address_p. */
1182 default_addr_space_legitimate_address_p (enum machine_mode mode
, rtx mem
,
1183 bool strict
, addr_space_t as
)
1185 if (!ADDR_SPACE_GENERIC_P (as
))
1188 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1191 /* Named address space version of LEGITIMIZE_ADDRESS. */
1194 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
1195 enum machine_mode mode
, addr_space_t as
)
1197 if (!ADDR_SPACE_GENERIC_P (as
))
1200 return targetm
.legitimize_address (x
, oldx
, mode
);
1203 /* The default hook for determining if one named address space is a subset of
1204 another and to return which address space to use as the common address
1208 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1210 return (subset
== superset
);
1213 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1214 called for targets with only a generic address space. */
1217 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1218 tree from_type ATTRIBUTE_UNUSED
,
1219 tree to_type ATTRIBUTE_UNUSED
)
1225 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1230 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1233 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1234 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1240 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1241 tree
ARG_UNUSED (name
),
1242 tree
ARG_UNUSED (args
),
1243 int ARG_UNUSED (flags
))
1245 warning (OPT_Wattributes
,
1246 "target attribute is not supported on this machine");
1252 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1253 tree
ARG_UNUSED (pop_target
))
1255 warning (OPT_Wpragmas
,
1256 "#pragma GCC target is not supported for this machine");
1262 default_target_can_inline_p (tree caller
, tree callee
)
1265 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1266 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1268 /* If callee has no option attributes, then it is ok to inline */
1272 /* If caller has no option attributes, but callee does then it is not ok to
1274 else if (!caller_opts
)
1277 /* If both caller and callee have attributes, assume that if the
1278 pointer is different, the two functions have different target
1279 options since build_target_option_node uses a hash table for the
1282 ret
= (callee_opts
== caller_opts
);
1288 # define HAVE_casesi 0
1291 /* If the machine does not have a case insn that compares the bounds,
1292 this means extra overhead for dispatch tables, which raises the
1293 threshold for using them. */
1296 default_case_values_threshold (void)
1298 return (HAVE_casesi
? 4 : 5);
1302 default_have_conditional_execution (void)
1304 #ifdef HAVE_conditional_execution
1305 return HAVE_conditional_execution
;
1312 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1317 /* Compute cost of moving registers to/from memory. */
1320 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1321 reg_class_t rclass ATTRIBUTE_UNUSED
,
1322 bool in ATTRIBUTE_UNUSED
)
1324 #ifndef MEMORY_MOVE_COST
1325 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1327 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1331 /* Compute cost of moving data from a register of class FROM to one of
1335 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED
,
1336 reg_class_t from ATTRIBUTE_UNUSED
,
1337 reg_class_t to ATTRIBUTE_UNUSED
)
1339 #ifndef REGISTER_MOVE_COST
1342 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1347 default_profile_before_prologue (void)
1349 #ifdef PROFILE_BEFORE_PROLOGUE
1356 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1359 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1362 #ifdef PREFERRED_RELOAD_CLASS
1363 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1369 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1372 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1378 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1380 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1385 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1388 default_class_likely_spilled_p (reg_class_t rclass
)
1390 return (reg_class_size
[(int) rclass
] == 1);
1393 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1396 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1397 enum machine_mode mode ATTRIBUTE_UNUSED
)
1399 #ifdef CLASS_MAX_NREGS
1400 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1402 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1406 /* Determine the debugging unwind mechanism for the target. */
1408 enum unwind_info_type
1409 default_debug_unwind_info (void)
1411 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1412 /* ??? Change all users to the hook, then poison this. */
1413 #ifdef DWARF2_FRAME_INFO
1414 if (DWARF2_FRAME_INFO
)
1418 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1419 #ifdef DWARF2_DEBUGGING_INFO
1420 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1427 /* To be used by targets where reg_raw_mode doesn't return the right
1428 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1431 default_get_reg_raw_mode (int regno
)
1433 return reg_raw_mode
[regno
];
1436 /* Return true if the state of option OPTION should be stored in PCH files
1437 and checked by default_pch_valid_p. Store the option's current state
1441 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1443 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1445 if (option_flag_var (option
, &global_options
) == &target_flags
)
1446 if (targetm
.check_pch_target_flags
)
1448 return get_option_state (&global_options
, option
, state
);
1451 /* Default version of get_pch_validity.
1452 By default, every flag difference is fatal; that will be mostly right for
1453 most targets, but completely right for very few. */
1456 default_get_pch_validity (size_t *sz
)
1458 struct cl_option_state state
;
1463 if (targetm
.check_pch_target_flags
)
1464 *sz
+= sizeof (target_flags
);
1465 for (i
= 0; i
< cl_options_count
; i
++)
1466 if (option_affects_pch_p (i
, &state
))
1469 result
= r
= XNEWVEC (char, *sz
);
1473 if (targetm
.check_pch_target_flags
)
1475 memcpy (r
, &target_flags
, sizeof (target_flags
));
1476 r
+= sizeof (target_flags
);
1479 for (i
= 0; i
< cl_options_count
; i
++)
1480 if (option_affects_pch_p (i
, &state
))
1482 memcpy (r
, state
.data
, state
.size
);
1489 /* Return a message which says that a PCH file was created with a different
1490 setting of OPTION. */
1493 pch_option_mismatch (const char *option
)
1497 asprintf (&r
, _("created and used with differing settings of '%s'"), option
);
1499 return _("out of memory");
1503 /* Default version of pch_valid_p. */
1506 default_pch_valid_p (const void *data_p
, size_t len
)
1508 struct cl_option_state state
;
1509 const char *data
= (const char *)data_p
;
1512 /* -fpic and -fpie also usually make a PCH invalid. */
1513 if (data
[0] != flag_pic
)
1514 return _("created and used with different settings of -fpic");
1515 if (data
[1] != flag_pie
)
1516 return _("created and used with different settings of -fpie");
1519 /* Check target_flags. */
1520 if (targetm
.check_pch_target_flags
)
1525 memcpy (&tf
, data
, sizeof (target_flags
));
1526 data
+= sizeof (target_flags
);
1527 len
-= sizeof (target_flags
);
1528 r
= targetm
.check_pch_target_flags (tf
);
1533 for (i
= 0; i
< cl_options_count
; i
++)
1534 if (option_affects_pch_p (i
, &state
))
1536 if (memcmp (data
, state
.data
, state
.size
) != 0)
1537 return pch_option_mismatch (cl_options
[i
].opt_text
);
1545 /* Default version of cstore_mode. */
1548 default_cstore_mode (enum insn_code icode
)
1550 return insn_data
[(int) icode
].operand
[0].mode
;
1553 /* Default version of member_type_forces_blk. */
1556 default_member_type_forces_blk (const_tree
, enum machine_mode
)
1561 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED
,
1562 rtx ptr ATTRIBUTE_UNUSED
,
1563 rtx bnd ATTRIBUTE_UNUSED
)
1569 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED
,
1570 rtx addr ATTRIBUTE_UNUSED
,
1571 rtx bounds ATTRIBUTE_UNUSED
,
1572 rtx to ATTRIBUTE_UNUSED
)
1578 default_fn_abi_va_list_bounds_size (tree fndecl ATTRIBUTE_UNUSED
)
1580 return integer_zero_node
;
1583 /* Default version of canonicalize_comparison. */
1586 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1590 #ifndef PAD_VARARGS_DOWN
1591 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
1594 /* Build an indirect-ref expression over the given TREE, which represents a
1595 piece of a va_arg() expansion. */
1597 build_va_arg_indirect_ref (tree addr
)
1599 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
1603 /* The "standard" implementation of va_arg: read the value from the
1604 current (padded) address and increment by the (padded) size. */
1607 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
1610 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
1611 unsigned HOST_WIDE_INT align
, boundary
;
1614 #ifdef ARGS_GROW_DOWNWARD
1615 /* All of the alignment and movement below is for args-grow-up machines.
1616 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
1617 implement their own specialized gimplify_va_arg_expr routines. */
1621 indirect
= pass_by_reference (NULL
, TYPE_MODE (type
), type
, false);
1623 type
= build_pointer_type (type
);
1625 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
1626 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
1628 /* When we align parameter on stack for caller, if the parameter
1629 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
1630 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
1631 here with caller. */
1632 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
1633 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
1635 boundary
/= BITS_PER_UNIT
;
1637 /* Hoist the valist value into a temporary for the moment. */
1638 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
1640 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
1641 requires greater alignment, we must perform dynamic alignment. */
1642 if (boundary
> align
1643 && !integer_zerop (TYPE_SIZE (type
)))
1645 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1646 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
1647 gimplify_and_add (t
, pre_p
);
1649 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1650 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
1652 build_int_cst (TREE_TYPE (valist
), -boundary
)));
1653 gimplify_and_add (t
, pre_p
);
1658 /* If the actual alignment is less than the alignment of the type,
1659 adjust the type accordingly so that we don't assume strict alignment
1660 when dereferencing the pointer. */
1661 boundary
*= BITS_PER_UNIT
;
1662 if (boundary
< TYPE_ALIGN (type
))
1664 type
= build_variant_type_copy (type
);
1665 TYPE_ALIGN (type
) = boundary
;
1668 /* Compute the rounded size of the type. */
1669 type_size
= size_in_bytes (type
);
1670 rounded_size
= round_up (type_size
, align
);
1672 /* Reduce rounded_size so it's sharable with the postqueue. */
1673 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
1677 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
1679 /* Small args are padded downward. */
1680 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
1681 rounded_size
, size_int (align
));
1682 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
1683 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
1684 addr
= fold_build_pointer_plus (addr
, t
);
1687 /* Compute new value for AP. */
1688 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
1689 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
1690 gimplify_and_add (t
, pre_p
);
1692 addr
= fold_convert (build_pointer_type (type
), addr
);
1695 addr
= build_va_arg_indirect_ref (addr
);
1697 return build_va_arg_indirect_ref (addr
);
1701 default_chkp_bound_type (void)
1703 tree res
= make_node (POINTER_BOUNDS_TYPE
);
1704 TYPE_PRECISION (res
) = TYPE_PRECISION (size_type_node
) * 2;
1710 default_chkp_bound_mode (void)
1716 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED
)
1722 #include "gt-targhooks.h"