1 /* Default target hook functions.
2 Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 /* The migration of target macros to target hooks works as follows:
23 1. Create a target hook that uses the existing target macros to
24 implement the same functionality.
26 2. Convert all the MI files to use the hook instead of the macro.
28 3. Repeat for a majority of the remaining target macros. This will
31 4. Tell target maintainers to start migrating.
33 5. Eventually convert the backends to override the hook instead of
34 defining the macros. This will take some time too.
36 6. TBD when, poison the macros. Unmigrated targets will break at
39 Note that we expect steps 1-3 to be done by the people that
40 understand what the MI does with each macro, and step 5 to be done
41 by the target maintainers for their respective targets.
43 Note that steps 1 and 2 don't have to be done together, but no
44 target can override the new hook until step 2 is complete for it.
46 Once the macros are poisoned, we will revert to the old migration
47 rules - migrate the macro, callers, and targets all at once. This
48 comment can thus be removed at that point. */
52 #include "coretypes.h"
59 #include "diagnostic-core.h"
64 #include "target-def.h"
66 #include "hard-reg-set.h"
74 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED,
75 rtx addr ATTRIBUTE_UNUSED,
76 bool strict ATTRIBUTE_UNUSED)
78 #ifdef GO_IF_LEGITIMATE_ADDRESS
79 /* Defer to the old implementation using a goto. */
81 return strict_memory_address_p (mode, addr);
83 return memory_address_p (mode, addr);
90 default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
92 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
93 ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file, fun);
98 default_unspec_may_trap_p (const_rtx x, unsigned flags)
102 if (GET_CODE (x) == UNSPEC_VOLATILE
103 /* Any floating arithmetic may trap. */
104 || (SCALAR_FLOAT_MODE_P (GET_MODE (x))
105 && flag_trapping_math))
108 for (i = 0; i < XVECLEN (x, 0); ++i)
110 if (may_trap_p_1 (XVECEXP (x, 0, i), flags))
118 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED,
119 enum machine_mode mode,
120 int *punsignedp ATTRIBUTE_UNUSED,
121 const_tree funtype ATTRIBUTE_UNUSED,
122 int for_return ATTRIBUTE_UNUSED)
125 return promote_mode (type, mode, punsignedp);
130 default_promote_function_mode_always_promote (const_tree type,
131 enum machine_mode mode,
133 const_tree funtype ATTRIBUTE_UNUSED,
134 int for_return ATTRIBUTE_UNUSED)
136 return promote_mode (type, mode, punsignedp);
141 default_cc_modes_compatible (enum machine_mode m1, enum machine_mode m2)
149 default_return_in_memory (const_tree type,
150 const_tree fntype ATTRIBUTE_UNUSED)
152 return (TYPE_MODE (type) == BLKmode);
156 default_legitimize_address (rtx x, rtx orig_x ATTRIBUTE_UNUSED,
157 enum machine_mode mode ATTRIBUTE_UNUSED)
163 default_expand_builtin_saveregs (void)
165 error ("__builtin_saveregs not supported by this target");
170 default_setup_incoming_varargs (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
171 enum machine_mode mode ATTRIBUTE_UNUSED,
172 tree type ATTRIBUTE_UNUSED,
173 int *pretend_arg_size ATTRIBUTE_UNUSED,
174 int second_time ATTRIBUTE_UNUSED)
178 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
181 default_builtin_setjmp_frame_value (void)
183 return virtual_stack_vars_rtx;
186 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
189 hook_bool_CUMULATIVE_ARGS_false (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED)
195 default_pretend_outgoing_varargs_named (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED)
197 return (targetm.calls.setup_incoming_varargs
198 != default_setup_incoming_varargs);
202 default_eh_return_filter_mode (void)
204 return targetm.unwind_word_mode ();
208 default_libgcc_cmp_return_mode (void)
214 default_libgcc_shift_count_mode (void)
220 default_unwind_word_mode (void)
225 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
227 unsigned HOST_WIDE_INT
228 default_shift_truncation_mask (enum machine_mode mode)
230 return SHIFT_COUNT_TRUNCATED ? GET_MODE_BITSIZE (mode) - 1 : 0;
233 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
236 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED)
238 return have_insn_for (DIV, mode) ? 3 : 2;
241 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
244 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED,
245 enum machine_mode mode_rep ATTRIBUTE_UNUSED)
250 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
253 hook_bool_CUMULATIVE_ARGS_true (CUMULATIVE_ARGS * a ATTRIBUTE_UNUSED)
258 /* Return machine mode for non-standard suffix
259 or VOIDmode if non-standard suffixes are unsupported. */
261 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED)
266 /* The generic C++ ABI specifies this is a 64-bit value. */
268 default_cxx_guard_type (void)
270 return long_long_integer_type_node;
274 /* Returns the size of the cookie to use when allocating an array
275 whose elements have the indicated TYPE. Assumes that it is already
276 known that a cookie is needed. */
279 default_cxx_get_cookie_size (tree type)
283 /* We need to allocate an additional max (sizeof (size_t), alignof
284 (true_type)) bytes. */
288 sizetype_size = size_in_bytes (sizetype);
289 type_align = size_int (TYPE_ALIGN_UNIT (type));
290 if (INT_CST_LT_UNSIGNED (type_align, sizetype_size))
291 cookie_size = sizetype_size;
293 cookie_size = type_align;
298 /* Return true if a parameter must be passed by reference. This version
299 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
302 hook_pass_by_reference_must_pass_in_stack (CUMULATIVE_ARGS *c ATTRIBUTE_UNUSED,
303 enum machine_mode mode ATTRIBUTE_UNUSED, const_tree type ATTRIBUTE_UNUSED,
304 bool named_arg ATTRIBUTE_UNUSED)
306 return targetm.calls.must_pass_in_stack (mode, type);
309 /* Return true if a parameter follows callee copies conventions. This
310 version of the hook is true for all named arguments. */
313 hook_callee_copies_named (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
314 enum machine_mode mode ATTRIBUTE_UNUSED,
315 const_tree type ATTRIBUTE_UNUSED, bool named)
320 /* Emit to STREAM the assembler syntax for insn operand X. */
323 default_print_operand (FILE *stream ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
324 int code ATTRIBUTE_UNUSED)
327 PRINT_OPERAND (stream, x, code);
333 /* Emit to STREAM the assembler syntax for an insn operand whose memory
337 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED,
338 rtx x ATTRIBUTE_UNUSED)
340 #ifdef PRINT_OPERAND_ADDRESS
341 PRINT_OPERAND_ADDRESS (stream, x);
347 /* Return true if CODE is a valid punctuation character for the
348 `print_operand' hook. */
351 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED)
353 #ifdef PRINT_OPERAND_PUNCT_VALID_P
354 return PRINT_OPERAND_PUNCT_VALID_P (code);
360 /* The default implementation of TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA. */
363 default_asm_output_addr_const_extra (FILE *file ATTRIBUTE_UNUSED,
364 rtx x ATTRIBUTE_UNUSED)
366 #ifdef OUTPUT_ADDR_CONST_EXTRA
367 OUTPUT_ADDR_CONST_EXTRA (file, x, fail);
375 /* True if MODE is valid for the target. By "valid", we mean able to
376 be manipulated in non-trivial ways. In particular, this means all
377 the arithmetic is supported.
379 By default we guess this means that any C type is supported. If
380 we can't map the mode back to a type that would be available in C,
381 then reject it. Special case, here, is the double-word arithmetic
382 supported by optabs.c. */
385 default_scalar_mode_supported_p (enum machine_mode mode)
387 int precision = GET_MODE_PRECISION (mode);
389 switch (GET_MODE_CLASS (mode))
391 case MODE_PARTIAL_INT:
393 if (precision == CHAR_TYPE_SIZE)
395 if (precision == SHORT_TYPE_SIZE)
397 if (precision == INT_TYPE_SIZE)
399 if (precision == LONG_TYPE_SIZE)
401 if (precision == LONG_LONG_TYPE_SIZE)
403 if (precision == 2 * BITS_PER_WORD)
408 if (precision == FLOAT_TYPE_SIZE)
410 if (precision == DOUBLE_TYPE_SIZE)
412 if (precision == LONG_DOUBLE_TYPE_SIZE)
416 case MODE_DECIMAL_FLOAT:
428 /* Make some target macros useable by target-independent code. */
430 targhook_words_big_endian (void)
432 return !!WORDS_BIG_ENDIAN;
436 targhook_float_words_big_endian (void)
438 return !!FLOAT_WORDS_BIG_ENDIAN;
441 /* True if the target supports decimal floating point. */
444 default_decimal_float_supported_p (void)
446 return ENABLE_DECIMAL_FLOAT;
449 /* True if the target supports fixed-point arithmetic. */
452 default_fixed_point_supported_p (void)
454 return ENABLE_FIXED_POINT;
457 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
460 This function checks whether a given INSN is valid within a low-overhead
461 loop. If INSN is invalid it returns the reason for that, otherwise it
462 returns NULL. A called function may clobber any special registers required
463 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
464 register for branch on table instructions. We reject the doloop pattern in
468 default_invalid_within_doloop (const_rtx insn)
471 return "Function call in loop.";
473 if (JUMP_TABLE_DATA_P (insn))
474 return "Computed branch in the loop.";
479 /* Mapping of builtin functions to vectorized variants. */
482 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED,
483 tree type_out ATTRIBUTE_UNUSED,
484 tree type_in ATTRIBUTE_UNUSED)
489 /* Vectorized conversion. */
492 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED,
493 tree dest_type ATTRIBUTE_UNUSED,
494 tree src_type ATTRIBUTE_UNUSED)
499 /* Default vectorizer cost model values. */
502 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
503 tree vectype ATTRIBUTE_UNUSED,
504 int misalign ATTRIBUTE_UNUSED)
506 switch (type_of_cost)
516 case cond_branch_not_taken:
521 case unaligned_store:
524 case cond_branch_taken:
535 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED,
536 bool md_fn ATTRIBUTE_UNUSED,
537 bool sqrt ATTRIBUTE_UNUSED)
543 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
544 CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
545 enum machine_mode mode ATTRIBUTE_UNUSED,
546 const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
552 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
553 CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
554 enum machine_mode mode ATTRIBUTE_UNUSED,
555 const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
561 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
562 CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
563 enum machine_mode mode ATTRIBUTE_UNUSED,
564 tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
570 default_function_arg_advance (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
571 enum machine_mode mode ATTRIBUTE_UNUSED,
572 const_tree type ATTRIBUTE_UNUSED,
573 bool named ATTRIBUTE_UNUSED)
575 #ifdef FUNCTION_ARG_ADVANCE
576 CUMULATIVE_ARGS args = *ca;
577 FUNCTION_ARG_ADVANCE (args, mode, CONST_CAST_TREE (type), named);
585 default_function_arg (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
586 enum machine_mode mode ATTRIBUTE_UNUSED,
587 const_tree type ATTRIBUTE_UNUSED,
588 bool named ATTRIBUTE_UNUSED)
591 return FUNCTION_ARG (*ca, mode, CONST_CAST_TREE (type), named);
598 default_function_incoming_arg (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
599 enum machine_mode mode ATTRIBUTE_UNUSED,
600 const_tree type ATTRIBUTE_UNUSED,
601 bool named ATTRIBUTE_UNUSED)
603 #ifdef FUNCTION_INCOMING_ARG
604 return FUNCTION_INCOMING_ARG (*ca, mode, CONST_CAST_TREE (type), named);
611 default_function_arg_boundary (enum machine_mode mode ATTRIBUTE_UNUSED,
612 const_tree type ATTRIBUTE_UNUSED)
614 return PARM_BOUNDARY;
618 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
623 hook_invalid_arg_for_unprototyped_fn (
624 const_tree typelist ATTRIBUTE_UNUSED,
625 const_tree funcdecl ATTRIBUTE_UNUSED,
626 const_tree val ATTRIBUTE_UNUSED)
631 /* Initialize the stack protection decls. */
633 /* Stack protection related decls living in libgcc. */
634 static GTY(()) tree stack_chk_guard_decl;
637 default_stack_protect_guard (void)
639 tree t = stack_chk_guard_decl;
645 t = build_decl (UNKNOWN_LOCATION,
646 VAR_DECL, get_identifier ("__stack_chk_guard"),
650 DECL_EXTERNAL (t) = 1;
652 TREE_THIS_VOLATILE (t) = 1;
653 DECL_ARTIFICIAL (t) = 1;
654 DECL_IGNORED_P (t) = 1;
656 /* Do not share RTL as the declaration is visible outside of
659 RTX_FLAG (x, used) = 1;
661 stack_chk_guard_decl = t;
667 static GTY(()) tree stack_chk_fail_decl;
670 default_external_stack_protect_fail (void)
672 tree t = stack_chk_fail_decl;
676 t = build_function_type_list (void_type_node, NULL_TREE);
677 t = build_decl (UNKNOWN_LOCATION,
678 FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
681 DECL_EXTERNAL (t) = 1;
683 TREE_THIS_VOLATILE (t) = 1;
684 TREE_NOTHROW (t) = 1;
685 DECL_ARTIFICIAL (t) = 1;
686 DECL_IGNORED_P (t) = 1;
687 DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
688 DECL_VISIBILITY_SPECIFIED (t) = 1;
690 stack_chk_fail_decl = t;
693 return build_call_expr (t, 0);
697 default_hidden_stack_protect_fail (void)
699 #ifndef HAVE_GAS_HIDDEN
700 return default_external_stack_protect_fail ();
702 tree t = stack_chk_fail_decl;
705 return default_external_stack_protect_fail ();
709 t = build_function_type_list (void_type_node, NULL_TREE);
710 t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
711 get_identifier ("__stack_chk_fail_local"), t);
714 DECL_EXTERNAL (t) = 1;
716 TREE_THIS_VOLATILE (t) = 1;
717 TREE_NOTHROW (t) = 1;
718 DECL_ARTIFICIAL (t) = 1;
719 DECL_IGNORED_P (t) = 1;
720 DECL_VISIBILITY_SPECIFIED (t) = 1;
721 DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
723 stack_chk_fail_decl = t;
726 return build_call_expr (t, 0);
731 hook_bool_const_rtx_commutative_p (const_rtx x,
732 int outer_code ATTRIBUTE_UNUSED)
734 return COMMUTATIVE_P (x);
738 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
739 const_tree fn_decl_or_type,
740 bool outgoing ATTRIBUTE_UNUSED)
742 /* The old interface doesn't handle receiving the function type. */
744 && !DECL_P (fn_decl_or_type))
745 fn_decl_or_type = NULL;
747 #ifdef FUNCTION_VALUE
748 return FUNCTION_VALUE (ret_type, fn_decl_or_type);
755 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED,
756 const_rtx fun ATTRIBUTE_UNUSED)
759 return LIBCALL_VALUE (mode);
765 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
768 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
770 #ifdef FUNCTION_VALUE_REGNO_P
771 return FUNCTION_VALUE_REGNO_P (regno);
778 default_internal_arg_pointer (void)
780 /* If the reg that the virtual arg pointer will be translated into is
781 not a fixed reg or is the stack pointer, make a copy of the virtual
782 arg pointer, and address parms via the copy. The frame pointer is
783 considered fixed even though it is not marked as such. */
784 if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
785 || ! (fixed_regs[ARG_POINTER_REGNUM]
786 || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
787 return copy_to_reg (virtual_incoming_args_rtx);
789 return virtual_incoming_args_rtx;
793 default_static_chain (const_tree fndecl, bool incoming_p)
795 if (!DECL_STATIC_CHAIN (fndecl))
800 #ifdef STATIC_CHAIN_INCOMING_REGNUM
801 return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
805 #ifdef STATIC_CHAIN_REGNUM
806 return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
810 static bool issued_error;
814 sorry ("nested functions not supported on this target");
817 /* It really doesn't matter what we return here, so long at it
818 doesn't cause the rest of the compiler to crash. */
819 return gen_rtx_MEM (Pmode, stack_pointer_rtx);
824 default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
825 rtx ARG_UNUSED (r_chain))
827 sorry ("nested function trampolines not supported on this target");
831 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED,
832 tree funtype ATTRIBUTE_UNUSED,
833 int size ATTRIBUTE_UNUSED)
839 default_branch_target_register_class (void)
844 #ifdef IRA_COVER_CLASSES
846 default_ira_cover_classes (void)
848 static reg_class_t classes[] = IRA_COVER_CLASSES;
854 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
855 reg_class_t reload_class_i ATTRIBUTE_UNUSED,
856 enum machine_mode reload_mode ATTRIBUTE_UNUSED,
857 secondary_reload_info *sri)
859 enum reg_class rclass = NO_REGS;
860 enum reg_class reload_class = (enum reg_class) reload_class_i;
862 if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
864 sri->icode = sri->prev_sri->t_icode;
867 #ifdef SECONDARY_INPUT_RELOAD_CLASS
869 rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x);
871 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
873 rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x);
875 if (rclass != NO_REGS)
878 = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
881 if (icode != CODE_FOR_nothing
882 && insn_data[(int) icode].operand[in_p].predicate
883 && ! insn_data[(int) icode].operand[in_p].predicate (x, reload_mode))
884 icode = CODE_FOR_nothing;
885 else if (icode != CODE_FOR_nothing)
887 const char *insn_constraint, *scratch_constraint;
888 char insn_letter, scratch_letter;
889 enum reg_class insn_class, scratch_class;
891 gcc_assert (insn_data[(int) icode].n_operands == 3);
892 insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
893 if (!*insn_constraint)
894 insn_class = ALL_REGS;
899 gcc_assert (*insn_constraint == '=');
902 insn_letter = *insn_constraint;
904 = (insn_letter == 'r' ? GENERAL_REGS
905 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter,
907 gcc_assert (insn_class != NO_REGS);
910 scratch_constraint = insn_data[(int) icode].operand[2].constraint;
911 /* The scratch register's constraint must start with "=&",
912 except for an input reload, where only "=" is necessary,
913 and where it might be beneficial to re-use registers from
915 gcc_assert (scratch_constraint[0] == '='
916 && (in_p || scratch_constraint[1] == '&'));
917 scratch_constraint++;
918 if (*scratch_constraint == '&')
919 scratch_constraint++;
920 scratch_letter = *scratch_constraint;
922 = (scratch_letter == 'r' ? GENERAL_REGS
923 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter,
924 scratch_constraint));
926 if (reg_class_subset_p (reload_class, insn_class))
928 gcc_assert (scratch_class == rclass);
935 if (rclass == NO_REGS)
938 sri->t_icode = icode;
944 default_handle_c_option (size_t code ATTRIBUTE_UNUSED,
945 const char *arg ATTRIBUTE_UNUSED,
946 int value ATTRIBUTE_UNUSED)
951 /* By default, if flag_pic is true, then neither local nor global relocs
952 should be placed in readonly memory. */
955 default_reloc_rw_mask (void)
957 return flag_pic ? 3 : 0;
960 /* By default, do no modification. */
961 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
968 default_builtin_vector_alignment_reachable (const_tree type, bool is_packed)
973 /* Assuming that types whose size is > pointer-size are not guaranteed to be
974 naturally aligned. */
975 if (tree_int_cst_compare (TYPE_SIZE (type), bitsize_int (POINTER_SIZE)) > 0)
978 /* Assuming that types whose size is <= pointer-size
979 are naturally aligned. */
983 /* By default, assume that a target supports any factor of misalignment
984 memory access if it supports movmisalign patten.
985 is_packed is true if the memory access is defined in a packed struct. */
987 default_builtin_support_vector_misalignment (enum machine_mode mode,
995 if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
1000 /* By default, only attempt to parallelize bitwise operations, and
1001 possibly adds/subtracts using bit-twiddling. */
1004 default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED)
1009 /* By default only the size derived from the preferred vector mode
1013 default_autovectorize_vector_sizes (void)
1018 /* Determine whether or not a pointer mode is valid. Assume defaults
1019 of ptr_mode or Pmode - can be overridden. */
1021 default_valid_pointer_mode (enum machine_mode mode)
1023 return (mode == ptr_mode || mode == Pmode);
1026 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1027 for the generic address space only. */
1030 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1032 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace));
1036 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1037 for the generic address space only. */
1040 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1042 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace));
1046 /* Named address space version of valid_pointer_mode. */
1049 default_addr_space_valid_pointer_mode (enum machine_mode mode, addr_space_t as)
1051 if (!ADDR_SPACE_GENERIC_P (as))
1052 return (mode == targetm.addr_space.pointer_mode (as)
1053 || mode == targetm.addr_space.address_mode (as));
1055 return targetm.valid_pointer_mode (mode);
1058 /* Some places still assume that all pointer or address modes are the
1059 standard Pmode and ptr_mode. These optimizations become invalid if
1060 the target actually supports multiple different modes. For now,
1061 we disable such optimizations on such targets, using this function. */
1064 target_default_pointer_address_modes_p (void)
1066 if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1068 if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1074 /* Named address space version of legitimate_address_p. */
1077 default_addr_space_legitimate_address_p (enum machine_mode mode, rtx mem,
1078 bool strict, addr_space_t as)
1080 if (!ADDR_SPACE_GENERIC_P (as))
1083 return targetm.legitimate_address_p (mode, mem, strict);
1086 /* Named address space version of LEGITIMIZE_ADDRESS. */
1089 default_addr_space_legitimize_address (rtx x, rtx oldx,
1090 enum machine_mode mode, addr_space_t as)
1092 if (!ADDR_SPACE_GENERIC_P (as))
1095 return targetm.legitimize_address (x, oldx, mode);
1098 /* The default hook for determining if one named address space is a subset of
1099 another and to return which address space to use as the common address
1103 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1105 return (subset == superset);
1108 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1109 called for targets with only a generic address space. */
1112 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1113 tree from_type ATTRIBUTE_UNUSED,
1114 tree to_type ATTRIBUTE_UNUSED)
1120 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1125 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1128 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED)
1130 #ifdef GO_IF_MODE_DEPENDENT_ADDRESS
1132 GO_IF_MODE_DEPENDENT_ADDRESS (CONST_CAST_RTX (addr), win);
1134 /* Label `win' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */
1135 win: ATTRIBUTE_UNUSED_LABEL
1146 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1147 tree ARG_UNUSED (name),
1148 tree ARG_UNUSED (args),
1149 int ARG_UNUSED (flags))
1151 warning (OPT_Wattributes,
1152 "target attribute is not supported on this machine");
1158 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1159 tree ARG_UNUSED (pop_target))
1161 warning (OPT_Wpragmas,
1162 "#pragma GCC target is not supported for this machine");
1168 default_target_can_inline_p (tree caller, tree callee)
1171 tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1172 tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1174 /* If callee has no option attributes, then it is ok to inline */
1178 /* If caller has no option attributes, but callee does then it is not ok to
1180 else if (!caller_opts)
1183 /* If both caller and callee have attributes, assume that if the pointer is
1184 different, the the two functions have different target options since
1185 build_target_option_node uses a hash table for the options. */
1187 ret = (callee_opts == caller_opts);
1193 # define HAVE_casesi 0
1196 /* If the machine does not have a case insn that compares the bounds,
1197 this means extra overhead for dispatch tables, which raises the
1198 threshold for using them. */
1200 unsigned int default_case_values_threshold (void)
1202 return (HAVE_casesi ? 4 : 5);
1206 default_have_conditional_execution (void)
1208 #ifdef HAVE_conditional_execution
1209 return HAVE_conditional_execution;
1215 /* Compute cost of moving registers to/from memory. */
1218 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED,
1219 reg_class_t rclass ATTRIBUTE_UNUSED,
1220 bool in ATTRIBUTE_UNUSED)
1222 #ifndef MEMORY_MOVE_COST
1223 return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1225 return MEMORY_MOVE_COST (mode, (enum reg_class) rclass, in);
1229 /* Compute cost of moving data from a register of class FROM to one of
1233 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED,
1234 reg_class_t from ATTRIBUTE_UNUSED,
1235 reg_class_t to ATTRIBUTE_UNUSED)
1237 #ifndef REGISTER_MOVE_COST
1240 return REGISTER_MOVE_COST (mode, (enum reg_class) from, (enum reg_class) to);
1245 default_profile_before_prologue (void)
1247 #ifdef PROFILE_BEFORE_PROLOGUE
1254 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1257 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1260 #ifdef PREFERRED_RELOAD_CLASS
1261 return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1267 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1270 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1273 #ifdef PREFERRED_OUTPUT_RELOAD_CLASS
1274 return PREFERRED_OUTPUT_RELOAD_CLASS (x, (enum reg_class) rclass);
1280 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1283 default_class_likely_spilled_p (reg_class_t rclass)
1285 return (reg_class_size[(int) rclass] == 1);
1288 /* Determine the debugging unwind mechanism for the target. */
1290 enum unwind_info_type
1291 default_debug_unwind_info (void)
1293 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1294 /* ??? Change all users to the hook, then poison this. */
1295 #ifdef DWARF2_FRAME_INFO
1296 if (DWARF2_FRAME_INFO)
1300 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1301 #ifdef DWARF2_DEBUGGING_INFO
1302 if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1309 /* Determine the exception handling mechanism for the target. */
1311 enum unwind_info_type
1312 default_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
1314 /* Obey the configure switch to turn on sjlj exceptions. */
1315 #ifdef CONFIG_SJLJ_EXCEPTIONS
1316 if (CONFIG_SJLJ_EXCEPTIONS)
1320 /* ??? Change all users to the hook, then poison this. */
1321 #ifdef DWARF2_UNWIND_INFO
1322 if (DWARF2_UNWIND_INFO)
1329 /* To be used by targets that force dwarf2 unwind enabled. */
1331 enum unwind_info_type
1332 dwarf2_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
1334 /* Obey the configure switch to turn on sjlj exceptions. */
1335 #ifdef CONFIG_SJLJ_EXCEPTIONS
1336 if (CONFIG_SJLJ_EXCEPTIONS)
1343 /* To be used by targets that force sjlj unwind enabled. */
1345 enum unwind_info_type
1346 sjlj_except_unwind_info (struct gcc_options *opts ATTRIBUTE_UNUSED)
1351 /* To be used by targets where reg_raw_mode doesn't return the right
1352 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1355 default_get_reg_raw_mode(int regno)
1357 return reg_raw_mode[regno];
1360 const struct default_options empty_optimization_table[] =
1362 { OPT_LEVELS_NONE, 0, NULL, 0 }
1365 #include "gt-targhooks.h"