1 /* Default target hook functions.
2 Copyright (C) 2003-2014 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 "hard-reg-set.h"
69 #include "target-def.h"
76 #include "tree-ssa-alias.h"
77 #include "gimple-expr.h"
79 #include "stringpool.h"
80 #include "tree-ssanames.h"
81 #include "insn-codes.h"
85 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED
,
86 rtx addr ATTRIBUTE_UNUSED
,
87 bool strict ATTRIBUTE_UNUSED
)
89 #ifdef GO_IF_LEGITIMATE_ADDRESS
90 /* Defer to the old implementation using a goto. */
92 return strict_memory_address_p (mode
, addr
);
94 return memory_address_p (mode
, addr
);
101 default_external_libcall (rtx fun ATTRIBUTE_UNUSED
)
103 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
104 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file
, fun
);
109 default_unspec_may_trap_p (const_rtx x
, unsigned flags
)
113 /* Any floating arithmetic may trap. */
114 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x
)) && flag_trapping_math
))
117 for (i
= 0; i
< XVECLEN (x
, 0); ++i
)
119 if (may_trap_p_1 (XVECEXP (x
, 0, i
), flags
))
127 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED
,
129 int *punsignedp ATTRIBUTE_UNUSED
,
130 const_tree funtype ATTRIBUTE_UNUSED
,
131 int for_return ATTRIBUTE_UNUSED
)
133 if (type
!= NULL_TREE
&& for_return
== 2)
134 return promote_mode (type
, mode
, punsignedp
);
139 default_promote_function_mode_always_promote (const_tree type
,
142 const_tree funtype ATTRIBUTE_UNUSED
,
143 int for_return ATTRIBUTE_UNUSED
)
145 return promote_mode (type
, mode
, punsignedp
);
149 default_cc_modes_compatible (machine_mode m1
, machine_mode m2
)
157 default_return_in_memory (const_tree type
,
158 const_tree fntype ATTRIBUTE_UNUSED
)
160 return (TYPE_MODE (type
) == BLKmode
);
164 default_legitimize_address (rtx x
, rtx orig_x ATTRIBUTE_UNUSED
,
165 machine_mode mode ATTRIBUTE_UNUSED
)
171 default_expand_builtin_saveregs (void)
173 error ("__builtin_saveregs not supported by this target");
178 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED
,
179 machine_mode mode ATTRIBUTE_UNUSED
,
180 tree type ATTRIBUTE_UNUSED
,
181 int *pretend_arg_size ATTRIBUTE_UNUSED
,
182 int second_time ATTRIBUTE_UNUSED
)
186 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
189 default_builtin_setjmp_frame_value (void)
191 return virtual_stack_vars_rtx
;
194 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
197 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED
)
203 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED
)
205 return (targetm
.calls
.setup_incoming_varargs
206 != default_setup_incoming_varargs
);
210 default_eh_return_filter_mode (void)
212 return targetm
.unwind_word_mode ();
216 default_libgcc_cmp_return_mode (void)
222 default_libgcc_shift_count_mode (void)
228 default_unwind_word_mode (void)
233 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
235 unsigned HOST_WIDE_INT
236 default_shift_truncation_mask (machine_mode mode
)
238 return SHIFT_COUNT_TRUNCATED
? GET_MODE_BITSIZE (mode
) - 1 : 0;
241 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
244 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED
)
246 return have_insn_for (DIV
, mode
) ? 3 : 2;
249 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
252 default_mode_rep_extended (machine_mode mode ATTRIBUTE_UNUSED
,
253 machine_mode mode_rep ATTRIBUTE_UNUSED
)
258 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
261 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED
)
266 /* Return machine mode for non-standard suffix
267 or VOIDmode if non-standard suffixes are unsupported. */
269 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED
)
274 /* The generic C++ ABI specifies this is a 64-bit value. */
276 default_cxx_guard_type (void)
278 return long_long_integer_type_node
;
281 /* Returns the size of the cookie to use when allocating an array
282 whose elements have the indicated TYPE. Assumes that it is already
283 known that a cookie is needed. */
286 default_cxx_get_cookie_size (tree type
)
290 /* We need to allocate an additional max (sizeof (size_t), alignof
291 (true_type)) bytes. */
295 sizetype_size
= size_in_bytes (sizetype
);
296 type_align
= size_int (TYPE_ALIGN_UNIT (type
));
297 if (tree_int_cst_lt (type_align
, sizetype_size
))
298 cookie_size
= sizetype_size
;
300 cookie_size
= type_align
;
305 /* Return true if a parameter must be passed by reference. This version
306 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
309 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED
,
310 machine_mode mode ATTRIBUTE_UNUSED
, const_tree type ATTRIBUTE_UNUSED
,
311 bool named_arg ATTRIBUTE_UNUSED
)
313 return targetm
.calls
.must_pass_in_stack (mode
, type
);
316 /* Return true if a parameter follows callee copies conventions. This
317 version of the hook is true for all named arguments. */
320 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED
,
321 machine_mode mode ATTRIBUTE_UNUSED
,
322 const_tree type ATTRIBUTE_UNUSED
, bool named
)
327 /* Emit to STREAM the assembler syntax for insn operand X. */
330 default_print_operand (FILE *stream ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
331 int code ATTRIBUTE_UNUSED
)
334 PRINT_OPERAND (stream
, x
, code
);
340 /* Emit to STREAM the assembler syntax for an insn operand whose memory
344 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED
,
345 rtx x ATTRIBUTE_UNUSED
)
347 #ifdef PRINT_OPERAND_ADDRESS
348 PRINT_OPERAND_ADDRESS (stream
, x
);
354 /* Return true if CODE is a valid punctuation character for the
355 `print_operand' hook. */
358 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED
)
360 #ifdef PRINT_OPERAND_PUNCT_VALID_P
361 return PRINT_OPERAND_PUNCT_VALID_P (code
);
367 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
369 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED
)
371 const char *skipped
= name
+ (*name
== '*' ? 1 : 0);
372 const char *stripped
= targetm
.strip_name_encoding (skipped
);
373 if (*name
!= '*' && user_label_prefix
[0])
374 stripped
= ACONCAT ((user_label_prefix
, stripped
, NULL
));
375 return get_identifier (stripped
);
378 /* True if MODE is valid for the target. By "valid", we mean able to
379 be manipulated in non-trivial ways. In particular, this means all
380 the arithmetic is supported.
382 By default we guess this means that any C type is supported. If
383 we can't map the mode back to a type that would be available in C,
384 then reject it. Special case, here, is the double-word arithmetic
385 supported by optabs.c. */
388 default_scalar_mode_supported_p (machine_mode mode
)
390 int precision
= GET_MODE_PRECISION (mode
);
392 switch (GET_MODE_CLASS (mode
))
394 case MODE_PARTIAL_INT
:
396 if (precision
== CHAR_TYPE_SIZE
)
398 if (precision
== SHORT_TYPE_SIZE
)
400 if (precision
== INT_TYPE_SIZE
)
402 if (precision
== LONG_TYPE_SIZE
)
404 if (precision
== LONG_LONG_TYPE_SIZE
)
406 if (precision
== 2 * BITS_PER_WORD
)
411 if (precision
== FLOAT_TYPE_SIZE
)
413 if (precision
== DOUBLE_TYPE_SIZE
)
415 if (precision
== LONG_DOUBLE_TYPE_SIZE
)
419 case MODE_DECIMAL_FLOAT
:
431 /* Return true if libgcc supports floating-point mode MODE (known to
432 be supported as a scalar mode). */
435 default_libgcc_floating_mode_supported_p (machine_mode mode
)
458 /* Make some target macros useable by target-independent code. */
460 targhook_words_big_endian (void)
462 return !!WORDS_BIG_ENDIAN
;
466 targhook_float_words_big_endian (void)
468 return !!FLOAT_WORDS_BIG_ENDIAN
;
471 /* True if the target supports floating-point exceptions and rounding
475 default_float_exceptions_rounding_supported_p (void)
484 /* True if the target supports decimal floating point. */
487 default_decimal_float_supported_p (void)
489 return ENABLE_DECIMAL_FLOAT
;
492 /* True if the target supports fixed-point arithmetic. */
495 default_fixed_point_supported_p (void)
497 return ENABLE_FIXED_POINT
;
500 /* True if the target supports GNU indirect functions. */
503 default_has_ifunc_p (void)
505 return HAVE_GNU_INDIRECT_FUNCTION
;
508 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
511 This function checks whether a given INSN is valid within a low-overhead
512 loop. If INSN is invalid it returns the reason for that, otherwise it
513 returns NULL. A called function may clobber any special registers required
514 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
515 register for branch on table instructions. We reject the doloop pattern in
519 default_invalid_within_doloop (const rtx_insn
*insn
)
522 return "Function call in loop.";
524 if (tablejump_p (insn
, NULL
, NULL
) || computed_jump_p (insn
))
525 return "Computed branch in the loop.";
530 /* Mapping of builtin functions to vectorized variants. */
533 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED
,
534 tree type_out ATTRIBUTE_UNUSED
,
535 tree type_in ATTRIBUTE_UNUSED
)
540 /* Vectorized conversion. */
543 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED
,
544 tree dest_type ATTRIBUTE_UNUSED
,
545 tree src_type ATTRIBUTE_UNUSED
)
550 /* Default vectorizer cost model values. */
553 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost
,
555 int misalign ATTRIBUTE_UNUSED
)
559 switch (type_of_cost
)
569 case cond_branch_not_taken
:
571 case vec_promote_demote
:
575 case unaligned_store
:
578 case cond_branch_taken
:
582 elements
= TYPE_VECTOR_SUBPARTS (vectype
);
583 return elements
/ 2 + 1;
593 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED
,
594 bool md_fn ATTRIBUTE_UNUSED
,
595 bool sqrt ATTRIBUTE_UNUSED
)
601 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
602 cumulative_args_t ca ATTRIBUTE_UNUSED
,
603 machine_mode mode ATTRIBUTE_UNUSED
,
604 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
610 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
611 cumulative_args_t ca ATTRIBUTE_UNUSED
,
612 machine_mode mode ATTRIBUTE_UNUSED
,
613 const_tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
619 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
620 cumulative_args_t ca ATTRIBUTE_UNUSED
,
621 machine_mode mode ATTRIBUTE_UNUSED
,
622 tree type ATTRIBUTE_UNUSED
, bool named ATTRIBUTE_UNUSED
)
628 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED
,
629 machine_mode mode ATTRIBUTE_UNUSED
,
630 const_tree type ATTRIBUTE_UNUSED
,
631 bool named ATTRIBUTE_UNUSED
)
637 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
638 machine_mode mode ATTRIBUTE_UNUSED
,
639 const_tree type ATTRIBUTE_UNUSED
,
640 bool named ATTRIBUTE_UNUSED
)
646 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED
,
647 machine_mode mode ATTRIBUTE_UNUSED
,
648 const_tree type ATTRIBUTE_UNUSED
,
649 bool named ATTRIBUTE_UNUSED
)
655 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
656 const_tree type ATTRIBUTE_UNUSED
)
658 return PARM_BOUNDARY
;
662 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED
,
663 const_tree type ATTRIBUTE_UNUSED
)
665 return PARM_BOUNDARY
;
669 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED
)
674 hook_invalid_arg_for_unprototyped_fn (
675 const_tree typelist ATTRIBUTE_UNUSED
,
676 const_tree funcdecl ATTRIBUTE_UNUSED
,
677 const_tree val ATTRIBUTE_UNUSED
)
682 /* Initialize the stack protection decls. */
684 /* Stack protection related decls living in libgcc. */
685 static GTY(()) tree stack_chk_guard_decl
;
688 default_stack_protect_guard (void)
690 tree t
= stack_chk_guard_decl
;
696 t
= build_decl (UNKNOWN_LOCATION
,
697 VAR_DECL
, get_identifier ("__stack_chk_guard"),
701 DECL_EXTERNAL (t
) = 1;
703 TREE_THIS_VOLATILE (t
) = 1;
704 DECL_ARTIFICIAL (t
) = 1;
705 DECL_IGNORED_P (t
) = 1;
707 /* Do not share RTL as the declaration is visible outside of
710 RTX_FLAG (x
, used
) = 1;
712 stack_chk_guard_decl
= t
;
718 static GTY(()) tree stack_chk_fail_decl
;
721 default_external_stack_protect_fail (void)
723 tree t
= stack_chk_fail_decl
;
727 t
= build_function_type_list (void_type_node
, NULL_TREE
);
728 t
= build_decl (UNKNOWN_LOCATION
,
729 FUNCTION_DECL
, get_identifier ("__stack_chk_fail"), t
);
732 DECL_EXTERNAL (t
) = 1;
734 TREE_THIS_VOLATILE (t
) = 1;
735 TREE_NOTHROW (t
) = 1;
736 DECL_ARTIFICIAL (t
) = 1;
737 DECL_IGNORED_P (t
) = 1;
738 DECL_VISIBILITY (t
) = VISIBILITY_DEFAULT
;
739 DECL_VISIBILITY_SPECIFIED (t
) = 1;
741 stack_chk_fail_decl
= t
;
744 return build_call_expr (t
, 0);
748 default_hidden_stack_protect_fail (void)
750 #ifndef HAVE_GAS_HIDDEN
751 return default_external_stack_protect_fail ();
753 tree t
= stack_chk_fail_decl
;
756 return default_external_stack_protect_fail ();
760 t
= build_function_type_list (void_type_node
, NULL_TREE
);
761 t
= build_decl (UNKNOWN_LOCATION
, FUNCTION_DECL
,
762 get_identifier ("__stack_chk_fail_local"), t
);
765 DECL_EXTERNAL (t
) = 1;
767 TREE_THIS_VOLATILE (t
) = 1;
768 TREE_NOTHROW (t
) = 1;
769 DECL_ARTIFICIAL (t
) = 1;
770 DECL_IGNORED_P (t
) = 1;
771 DECL_VISIBILITY_SPECIFIED (t
) = 1;
772 DECL_VISIBILITY (t
) = VISIBILITY_HIDDEN
;
774 stack_chk_fail_decl
= t
;
777 return build_call_expr (t
, 0);
782 hook_bool_const_rtx_commutative_p (const_rtx x
,
783 int outer_code ATTRIBUTE_UNUSED
)
785 return COMMUTATIVE_P (x
);
789 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED
,
790 const_tree fn_decl_or_type
,
791 bool outgoing ATTRIBUTE_UNUSED
)
793 /* The old interface doesn't handle receiving the function type. */
795 && !DECL_P (fn_decl_or_type
))
796 fn_decl_or_type
= NULL
;
798 #ifdef FUNCTION_VALUE
799 return FUNCTION_VALUE (ret_type
, fn_decl_or_type
);
806 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED
,
807 const_rtx fun ATTRIBUTE_UNUSED
)
810 return LIBCALL_VALUE (mode
);
816 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
819 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED
)
821 #ifdef FUNCTION_VALUE_REGNO_P
822 return FUNCTION_VALUE_REGNO_P (regno
);
829 default_internal_arg_pointer (void)
831 /* If the reg that the virtual arg pointer will be translated into is
832 not a fixed reg or is the stack pointer, make a copy of the virtual
833 arg pointer, and address parms via the copy. The frame pointer is
834 considered fixed even though it is not marked as such. */
835 if ((ARG_POINTER_REGNUM
== STACK_POINTER_REGNUM
836 || ! (fixed_regs
[ARG_POINTER_REGNUM
]
837 || ARG_POINTER_REGNUM
== FRAME_POINTER_REGNUM
)))
838 return copy_to_reg (virtual_incoming_args_rtx
);
840 return virtual_incoming_args_rtx
;
844 default_static_chain (const_tree fndecl
, bool incoming_p
)
846 if (!DECL_STATIC_CHAIN (fndecl
))
851 #ifdef STATIC_CHAIN_INCOMING_REGNUM
852 return gen_rtx_REG (Pmode
, STATIC_CHAIN_INCOMING_REGNUM
);
856 #ifdef STATIC_CHAIN_REGNUM
857 return gen_rtx_REG (Pmode
, STATIC_CHAIN_REGNUM
);
861 static bool issued_error
;
865 sorry ("nested functions not supported on this target");
868 /* It really doesn't matter what we return here, so long at it
869 doesn't cause the rest of the compiler to crash. */
870 return gen_rtx_MEM (Pmode
, stack_pointer_rtx
);
875 default_trampoline_init (rtx
ARG_UNUSED (m_tramp
), tree
ARG_UNUSED (t_func
),
876 rtx
ARG_UNUSED (r_chain
))
878 sorry ("nested function trampolines not supported on this target");
882 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED
,
883 tree funtype ATTRIBUTE_UNUSED
,
884 int size ATTRIBUTE_UNUSED
)
890 default_branch_target_register_class (void)
902 default_register_priority (int hard_regno ATTRIBUTE_UNUSED
)
908 default_register_usage_leveling_p (void)
914 default_different_addr_displacement_p (void)
920 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED
, rtx x ATTRIBUTE_UNUSED
,
921 reg_class_t reload_class_i ATTRIBUTE_UNUSED
,
922 machine_mode reload_mode ATTRIBUTE_UNUSED
,
923 secondary_reload_info
*sri
)
925 enum reg_class rclass
= NO_REGS
;
926 enum reg_class reload_class
= (enum reg_class
) reload_class_i
;
928 if (sri
->prev_sri
&& sri
->prev_sri
->t_icode
!= CODE_FOR_nothing
)
930 sri
->icode
= sri
->prev_sri
->t_icode
;
933 #ifdef SECONDARY_INPUT_RELOAD_CLASS
935 rclass
= SECONDARY_INPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
937 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
939 rclass
= SECONDARY_OUTPUT_RELOAD_CLASS (reload_class
, reload_mode
, x
);
941 if (rclass
!= NO_REGS
)
944 = direct_optab_handler (in_p
? reload_in_optab
: reload_out_optab
,
947 if (icode
!= CODE_FOR_nothing
948 && !insn_operand_matches (icode
, in_p
, x
))
949 icode
= CODE_FOR_nothing
;
950 else if (icode
!= CODE_FOR_nothing
)
952 const char *insn_constraint
, *scratch_constraint
;
953 enum reg_class insn_class
, scratch_class
;
955 gcc_assert (insn_data
[(int) icode
].n_operands
== 3);
956 insn_constraint
= insn_data
[(int) icode
].operand
[!in_p
].constraint
;
957 if (!*insn_constraint
)
958 insn_class
= ALL_REGS
;
963 gcc_assert (*insn_constraint
== '=');
966 insn_class
= (reg_class_for_constraint
967 (lookup_constraint (insn_constraint
)));
968 gcc_assert (insn_class
!= NO_REGS
);
971 scratch_constraint
= insn_data
[(int) icode
].operand
[2].constraint
;
972 /* The scratch register's constraint must start with "=&",
973 except for an input reload, where only "=" is necessary,
974 and where it might be beneficial to re-use registers from
976 gcc_assert (scratch_constraint
[0] == '='
977 && (in_p
|| scratch_constraint
[1] == '&'));
978 scratch_constraint
++;
979 if (*scratch_constraint
== '&')
980 scratch_constraint
++;
981 scratch_class
= (reg_class_for_constraint
982 (lookup_constraint (scratch_constraint
)));
984 if (reg_class_subset_p (reload_class
, insn_class
))
986 gcc_assert (scratch_class
== rclass
);
993 if (rclass
== NO_REGS
)
996 sri
->t_icode
= icode
;
1001 /* By default, if flag_pic is true, then neither local nor global relocs
1002 should be placed in readonly memory. */
1005 default_reloc_rw_mask (void)
1007 return flag_pic
? 3 : 0;
1010 /* By default, do no modification. */
1011 tree
default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED
,
1017 /* Default to natural alignment for vector types. */
1019 default_vector_alignment (const_tree type
)
1021 return tree_to_shwi (TYPE_SIZE (type
));
1025 default_builtin_vector_alignment_reachable (const_tree type
, bool is_packed
)
1030 /* Assuming that types whose size is > pointer-size are not guaranteed to be
1031 naturally aligned. */
1032 if (tree_int_cst_compare (TYPE_SIZE (type
), bitsize_int (POINTER_SIZE
)) > 0)
1035 /* Assuming that types whose size is <= pointer-size
1036 are naturally aligned. */
1040 /* By default, assume that a target supports any factor of misalignment
1041 memory access if it supports movmisalign patten.
1042 is_packed is true if the memory access is defined in a packed struct. */
1044 default_builtin_support_vector_misalignment (machine_mode mode
,
1052 if (optab_handler (movmisalign_optab
, mode
) != CODE_FOR_nothing
)
1057 /* By default, only attempt to parallelize bitwise operations, and
1058 possibly adds/subtracts using bit-twiddling. */
1061 default_preferred_simd_mode (machine_mode mode ATTRIBUTE_UNUSED
)
1066 /* By default only the size derived from the preferred vector mode
1070 default_autovectorize_vector_sizes (void)
1075 /* By default, the cost model accumulates three separate costs (prologue,
1076 loop body, and epilogue) for a vectorized loop or block. So allocate an
1077 array of three unsigned ints, set it to zero, and return its address. */
1080 default_init_cost (struct loop
*loop_info ATTRIBUTE_UNUSED
)
1082 unsigned *cost
= XNEWVEC (unsigned, 3);
1083 cost
[vect_prologue
] = cost
[vect_body
] = cost
[vect_epilogue
] = 0;
1087 /* By default, the cost model looks up the cost of the given statement
1088 kind and mode, multiplies it by the occurrence count, accumulates
1089 it into the cost specified by WHERE, and returns the cost added. */
1092 default_add_stmt_cost (void *data
, int count
, enum vect_cost_for_stmt kind
,
1093 struct _stmt_vec_info
*stmt_info
, int misalign
,
1094 enum vect_cost_model_location where
)
1096 unsigned *cost
= (unsigned *) data
;
1097 unsigned retval
= 0;
1099 tree vectype
= stmt_info
? stmt_vectype (stmt_info
) : NULL_TREE
;
1100 int stmt_cost
= targetm
.vectorize
.builtin_vectorization_cost (kind
, vectype
,
1102 /* Statements in an inner loop relative to the loop being
1103 vectorized are weighted more heavily. The value here is
1104 arbitrary and could potentially be improved with analysis. */
1105 if (where
== vect_body
&& stmt_info
&& stmt_in_inner_loop_p (stmt_info
))
1106 count
*= 50; /* FIXME. */
1108 retval
= (unsigned) (count
* stmt_cost
);
1109 cost
[where
] += retval
;
1114 /* By default, the cost model just returns the accumulated costs. */
1117 default_finish_cost (void *data
, unsigned *prologue_cost
,
1118 unsigned *body_cost
, unsigned *epilogue_cost
)
1120 unsigned *cost
= (unsigned *) data
;
1121 *prologue_cost
= cost
[vect_prologue
];
1122 *body_cost
= cost
[vect_body
];
1123 *epilogue_cost
= cost
[vect_epilogue
];
1126 /* Free the cost data. */
1129 default_destroy_cost_data (void *data
)
1134 /* Determine whether or not a pointer mode is valid. Assume defaults
1135 of ptr_mode or Pmode - can be overridden. */
1137 default_valid_pointer_mode (machine_mode mode
)
1139 return (mode
== ptr_mode
|| mode
== Pmode
);
1142 /* Determine whether the memory reference specified by REF may alias
1143 the C libraries errno location. */
1145 default_ref_may_alias_errno (ao_ref
*ref
)
1147 tree base
= ao_ref_base (ref
);
1148 /* The default implementation assumes the errno location is
1149 a declaration of type int or is always accessed via a
1150 pointer to int. We assume that accesses to errno are
1151 not deliberately obfuscated (even in conforming ways). */
1152 if (TYPE_UNSIGNED (TREE_TYPE (base
))
1153 || TYPE_MODE (TREE_TYPE (base
)) != TYPE_MODE (integer_type_node
))
1155 /* The default implementation assumes an errno location
1156 declaration is never defined in the current compilation unit. */
1158 && !TREE_STATIC (base
))
1160 else if (TREE_CODE (base
) == MEM_REF
1161 && TREE_CODE (TREE_OPERAND (base
, 0)) == SSA_NAME
)
1163 struct ptr_info_def
*pi
= SSA_NAME_PTR_INFO (TREE_OPERAND (base
, 0));
1164 return !pi
|| pi
->pt
.anything
|| pi
->pt
.nonlocal
;
1169 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1170 for the generic address space only. */
1173 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1175 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1179 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1180 for the generic address space only. */
1183 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED
)
1185 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace
));
1189 /* Named address space version of valid_pointer_mode. */
1192 default_addr_space_valid_pointer_mode (machine_mode mode
, addr_space_t as
)
1194 if (!ADDR_SPACE_GENERIC_P (as
))
1195 return (mode
== targetm
.addr_space
.pointer_mode (as
)
1196 || mode
== targetm
.addr_space
.address_mode (as
));
1198 return targetm
.valid_pointer_mode (mode
);
1201 /* Some places still assume that all pointer or address modes are the
1202 standard Pmode and ptr_mode. These optimizations become invalid if
1203 the target actually supports multiple different modes. For now,
1204 we disable such optimizations on such targets, using this function. */
1207 target_default_pointer_address_modes_p (void)
1209 if (targetm
.addr_space
.address_mode
!= default_addr_space_address_mode
)
1211 if (targetm
.addr_space
.pointer_mode
!= default_addr_space_pointer_mode
)
1217 /* Named address space version of legitimate_address_p. */
1220 default_addr_space_legitimate_address_p (machine_mode mode
, rtx mem
,
1221 bool strict
, addr_space_t as
)
1223 if (!ADDR_SPACE_GENERIC_P (as
))
1226 return targetm
.legitimate_address_p (mode
, mem
, strict
);
1229 /* Named address space version of LEGITIMIZE_ADDRESS. */
1232 default_addr_space_legitimize_address (rtx x
, rtx oldx
,
1233 machine_mode mode
, addr_space_t as
)
1235 if (!ADDR_SPACE_GENERIC_P (as
))
1238 return targetm
.legitimize_address (x
, oldx
, mode
);
1241 /* The default hook for determining if one named address space is a subset of
1242 another and to return which address space to use as the common address
1246 default_addr_space_subset_p (addr_space_t subset
, addr_space_t superset
)
1248 return (subset
== superset
);
1251 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1252 called for targets with only a generic address space. */
1255 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED
,
1256 tree from_type ATTRIBUTE_UNUSED
,
1257 tree to_type ATTRIBUTE_UNUSED
)
1263 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED
)
1268 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1271 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED
,
1272 addr_space_t addrspace ATTRIBUTE_UNUSED
)
1278 default_target_option_valid_attribute_p (tree
ARG_UNUSED (fndecl
),
1279 tree
ARG_UNUSED (name
),
1280 tree
ARG_UNUSED (args
),
1281 int ARG_UNUSED (flags
))
1283 warning (OPT_Wattributes
,
1284 "target attribute is not supported on this machine");
1290 default_target_option_pragma_parse (tree
ARG_UNUSED (args
),
1291 tree
ARG_UNUSED (pop_target
))
1293 warning (OPT_Wpragmas
,
1294 "#pragma GCC target is not supported for this machine");
1300 default_target_can_inline_p (tree caller
, tree callee
)
1303 tree callee_opts
= DECL_FUNCTION_SPECIFIC_TARGET (callee
);
1304 tree caller_opts
= DECL_FUNCTION_SPECIFIC_TARGET (caller
);
1306 /* If callee has no option attributes, then it is ok to inline */
1310 /* If caller has no option attributes, but callee does then it is not ok to
1312 else if (!caller_opts
)
1315 /* If both caller and callee have attributes, assume that if the
1316 pointer is different, the two functions have different target
1317 options since build_target_option_node uses a hash table for the
1320 ret
= (callee_opts
== caller_opts
);
1326 # define HAVE_casesi 0
1329 /* If the machine does not have a case insn that compares the bounds,
1330 this means extra overhead for dispatch tables, which raises the
1331 threshold for using them. */
1334 default_case_values_threshold (void)
1336 return (HAVE_casesi
? 4 : 5);
1340 default_have_conditional_execution (void)
1342 #ifdef HAVE_conditional_execution
1343 return HAVE_conditional_execution
;
1349 /* By default we assume that c99 functions are present at the runtime,
1350 but sincos is not. */
1352 default_libc_has_function (enum function_class fn_class
)
1354 if (fn_class
== function_c94
1355 || fn_class
== function_c99_misc
1356 || fn_class
== function_c99_math_complex
)
1363 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1369 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED
)
1375 default_builtin_tm_load_store (tree
ARG_UNUSED (type
))
1380 /* Compute cost of moving registers to/from memory. */
1383 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1384 reg_class_t rclass ATTRIBUTE_UNUSED
,
1385 bool in ATTRIBUTE_UNUSED
)
1387 #ifndef MEMORY_MOVE_COST
1388 return (4 + memory_move_secondary_cost (mode
, (enum reg_class
) rclass
, in
));
1390 return MEMORY_MOVE_COST (mode
, (enum reg_class
) rclass
, in
);
1394 /* Compute cost of moving data from a register of class FROM to one of
1398 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED
,
1399 reg_class_t from ATTRIBUTE_UNUSED
,
1400 reg_class_t to ATTRIBUTE_UNUSED
)
1402 #ifndef REGISTER_MOVE_COST
1405 return REGISTER_MOVE_COST (mode
, (enum reg_class
) from
, (enum reg_class
) to
);
1409 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1410 behaviour. SPEED_P is true if we are compiling for speed. */
1413 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED
)
1415 unsigned int move_ratio
;
1417 move_ratio
= (unsigned int) MOVE_RATIO (speed_p
);
1419 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1421 #else /* No movmem patterns, pick a default. */
1422 move_ratio
= ((speed_p
) ? 15 : 3);
1428 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1429 used; return FALSE if the movmem/setmem optab should be expanded, or
1430 a call to memcpy emitted. */
1433 default_use_by_pieces_infrastructure_p (unsigned int size
,
1434 unsigned int alignment
,
1435 enum by_pieces_operation op
,
1438 unsigned int max_size
= 0;
1439 unsigned int ratio
= 0;
1443 case CLEAR_BY_PIECES
:
1444 max_size
= STORE_MAX_PIECES
;
1445 ratio
= CLEAR_RATIO (speed_p
);
1447 case MOVE_BY_PIECES
:
1448 max_size
= MOVE_MAX_PIECES
;
1449 ratio
= get_move_ratio (speed_p
);
1452 max_size
= STORE_MAX_PIECES
;
1453 ratio
= SET_RATIO (speed_p
);
1455 case STORE_BY_PIECES
:
1456 max_size
= STORE_MAX_PIECES
;
1457 ratio
= get_move_ratio (speed_p
);
1461 return move_by_pieces_ninsns (size
, alignment
, max_size
+ 1) < ratio
;
1465 default_profile_before_prologue (void)
1467 #ifdef PROFILE_BEFORE_PROLOGUE
1474 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1477 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED
,
1480 #ifdef PREFERRED_RELOAD_CLASS
1481 return (reg_class_t
) PREFERRED_RELOAD_CLASS (x
, (enum reg_class
) rclass
);
1487 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1490 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED
,
1496 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1498 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED
)
1503 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1506 default_class_likely_spilled_p (reg_class_t rclass
)
1508 return (reg_class_size
[(int) rclass
] == 1);
1511 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1514 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED
,
1515 machine_mode mode ATTRIBUTE_UNUSED
)
1517 #ifdef CLASS_MAX_NREGS
1518 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class
) rclass
, mode
);
1520 return ((GET_MODE_SIZE (mode
) + UNITS_PER_WORD
- 1) / UNITS_PER_WORD
);
1524 /* Determine the debugging unwind mechanism for the target. */
1526 enum unwind_info_type
1527 default_debug_unwind_info (void)
1529 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1530 /* ??? Change all users to the hook, then poison this. */
1531 #ifdef DWARF2_FRAME_INFO
1532 if (DWARF2_FRAME_INFO
)
1536 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1537 #ifdef DWARF2_DEBUGGING_INFO
1538 if (write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1545 /* Determine the correct mode for a Dwarf frame register that represents
1549 default_dwarf_frame_reg_mode (int regno
)
1551 machine_mode save_mode
= reg_raw_mode
[regno
];
1553 if (HARD_REGNO_CALL_PART_CLOBBERED (regno
, save_mode
))
1554 save_mode
= choose_hard_reg_mode (regno
, 1, true);
1558 /* To be used by targets where reg_raw_mode doesn't return the right
1559 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1562 default_get_reg_raw_mode (int regno
)
1564 return reg_raw_mode
[regno
];
1567 /* Return true if a leaf function should stay leaf even with profiling
1571 default_keep_leaf_when_profiled ()
1576 /* Return true if the state of option OPTION should be stored in PCH files
1577 and checked by default_pch_valid_p. Store the option's current state
1581 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1583 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1585 if ((cl_options
[option
].flags
& CL_PCH_IGNORE
) != 0)
1587 if (option_flag_var (option
, &global_options
) == &target_flags
)
1588 if (targetm
.check_pch_target_flags
)
1590 return get_option_state (&global_options
, option
, state
);
1593 /* Default version of get_pch_validity.
1594 By default, every flag difference is fatal; that will be mostly right for
1595 most targets, but completely right for very few. */
1598 default_get_pch_validity (size_t *sz
)
1600 struct cl_option_state state
;
1605 if (targetm
.check_pch_target_flags
)
1606 *sz
+= sizeof (target_flags
);
1607 for (i
= 0; i
< cl_options_count
; i
++)
1608 if (option_affects_pch_p (i
, &state
))
1611 result
= r
= XNEWVEC (char, *sz
);
1615 if (targetm
.check_pch_target_flags
)
1617 memcpy (r
, &target_flags
, sizeof (target_flags
));
1618 r
+= sizeof (target_flags
);
1621 for (i
= 0; i
< cl_options_count
; i
++)
1622 if (option_affects_pch_p (i
, &state
))
1624 memcpy (r
, state
.data
, state
.size
);
1631 /* Return a message which says that a PCH file was created with a different
1632 setting of OPTION. */
1635 pch_option_mismatch (const char *option
)
1639 asprintf (&r
, _("created and used with differing settings of '%s'"), option
);
1641 return _("out of memory");
1645 /* Default version of pch_valid_p. */
1648 default_pch_valid_p (const void *data_p
, size_t len
)
1650 struct cl_option_state state
;
1651 const char *data
= (const char *)data_p
;
1654 /* -fpic and -fpie also usually make a PCH invalid. */
1655 if (data
[0] != flag_pic
)
1656 return _("created and used with different settings of -fpic");
1657 if (data
[1] != flag_pie
)
1658 return _("created and used with different settings of -fpie");
1661 /* Check target_flags. */
1662 if (targetm
.check_pch_target_flags
)
1667 memcpy (&tf
, data
, sizeof (target_flags
));
1668 data
+= sizeof (target_flags
);
1669 len
-= sizeof (target_flags
);
1670 r
= targetm
.check_pch_target_flags (tf
);
1675 for (i
= 0; i
< cl_options_count
; i
++)
1676 if (option_affects_pch_p (i
, &state
))
1678 if (memcmp (data
, state
.data
, state
.size
) != 0)
1679 return pch_option_mismatch (cl_options
[i
].opt_text
);
1687 /* Default version of cstore_mode. */
1690 default_cstore_mode (enum insn_code icode
)
1692 return insn_data
[(int) icode
].operand
[0].mode
;
1695 /* Default version of member_type_forces_blk. */
1698 default_member_type_forces_blk (const_tree
, machine_mode
)
1703 /* Default version of canonicalize_comparison. */
1706 default_canonicalize_comparison (int *, rtx
*, rtx
*, bool)
1710 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
1713 default_atomic_assign_expand_fenv (tree
*, tree
*, tree
*)
1717 #ifndef PAD_VARARGS_DOWN
1718 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
1721 /* Build an indirect-ref expression over the given TREE, which represents a
1722 piece of a va_arg() expansion. */
1724 build_va_arg_indirect_ref (tree addr
)
1726 addr
= build_simple_mem_ref_loc (EXPR_LOCATION (addr
), addr
);
1730 /* The "standard" implementation of va_arg: read the value from the
1731 current (padded) address and increment by the (padded) size. */
1734 std_gimplify_va_arg_expr (tree valist
, tree type
, gimple_seq
*pre_p
,
1737 tree addr
, t
, type_size
, rounded_size
, valist_tmp
;
1738 unsigned HOST_WIDE_INT align
, boundary
;
1741 #ifdef ARGS_GROW_DOWNWARD
1742 /* All of the alignment and movement below is for args-grow-up machines.
1743 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
1744 implement their own specialized gimplify_va_arg_expr routines. */
1748 indirect
= pass_by_reference (NULL
, TYPE_MODE (type
), type
, false);
1750 type
= build_pointer_type (type
);
1752 align
= PARM_BOUNDARY
/ BITS_PER_UNIT
;
1753 boundary
= targetm
.calls
.function_arg_boundary (TYPE_MODE (type
), type
);
1755 /* When we align parameter on stack for caller, if the parameter
1756 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
1757 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
1758 here with caller. */
1759 if (boundary
> MAX_SUPPORTED_STACK_ALIGNMENT
)
1760 boundary
= MAX_SUPPORTED_STACK_ALIGNMENT
;
1762 boundary
/= BITS_PER_UNIT
;
1764 /* Hoist the valist value into a temporary for the moment. */
1765 valist_tmp
= get_initialized_tmp_var (valist
, pre_p
, NULL
);
1767 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
1768 requires greater alignment, we must perform dynamic alignment. */
1769 if (boundary
> align
1770 && !integer_zerop (TYPE_SIZE (type
)))
1772 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1773 fold_build_pointer_plus_hwi (valist_tmp
, boundary
- 1));
1774 gimplify_and_add (t
, pre_p
);
1776 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist_tmp
,
1777 fold_build2 (BIT_AND_EXPR
, TREE_TYPE (valist
),
1779 build_int_cst (TREE_TYPE (valist
), -boundary
)));
1780 gimplify_and_add (t
, pre_p
);
1785 /* If the actual alignment is less than the alignment of the type,
1786 adjust the type accordingly so that we don't assume strict alignment
1787 when dereferencing the pointer. */
1788 boundary
*= BITS_PER_UNIT
;
1789 if (boundary
< TYPE_ALIGN (type
))
1791 type
= build_variant_type_copy (type
);
1792 TYPE_ALIGN (type
) = boundary
;
1795 /* Compute the rounded size of the type. */
1796 type_size
= size_in_bytes (type
);
1797 rounded_size
= round_up (type_size
, align
);
1799 /* Reduce rounded_size so it's sharable with the postqueue. */
1800 gimplify_expr (&rounded_size
, pre_p
, post_p
, is_gimple_val
, fb_rvalue
);
1804 if (PAD_VARARGS_DOWN
&& !integer_zerop (rounded_size
))
1806 /* Small args are padded downward. */
1807 t
= fold_build2_loc (input_location
, GT_EXPR
, sizetype
,
1808 rounded_size
, size_int (align
));
1809 t
= fold_build3 (COND_EXPR
, sizetype
, t
, size_zero_node
,
1810 size_binop (MINUS_EXPR
, rounded_size
, type_size
));
1811 addr
= fold_build_pointer_plus (addr
, t
);
1814 /* Compute new value for AP. */
1815 t
= fold_build_pointer_plus (valist_tmp
, rounded_size
);
1816 t
= build2 (MODIFY_EXPR
, TREE_TYPE (valist
), valist
, t
);
1817 gimplify_and_add (t
, pre_p
);
1819 addr
= fold_convert (build_pointer_type (type
), addr
);
1822 addr
= build_va_arg_indirect_ref (addr
);
1824 return build_va_arg_indirect_ref (addr
);
1827 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
1828 not support nested low-overhead loops. */
1831 can_use_doloop_if_innermost (const widest_int
&, const widest_int
&,
1832 unsigned int loop_depth
, bool)
1834 return loop_depth
== 1;
1837 #include "gt-targhooks.h"