1 /* Default target hook functions.
2 Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
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"
63 #include "target-def.h"
65 #include "hard-reg-set.h"
72 #include "tree-flow.h"
73 #include "tree-ssa-alias.h"
77 default_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED,
78 rtx addr ATTRIBUTE_UNUSED,
79 bool strict ATTRIBUTE_UNUSED)
81 #ifdef GO_IF_LEGITIMATE_ADDRESS
82 /* Defer to the old implementation using a goto. */
84 return strict_memory_address_p (mode, addr);
86 return memory_address_p (mode, addr);
93 default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
95 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
96 ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file, fun);
101 default_unspec_may_trap_p (const_rtx x, unsigned flags)
105 if (GET_CODE (x) == UNSPEC_VOLATILE
106 /* Any floating arithmetic may trap. */
107 || (SCALAR_FLOAT_MODE_P (GET_MODE (x))
108 && flag_trapping_math))
111 for (i = 0; i < XVECLEN (x, 0); ++i)
113 if (may_trap_p_1 (XVECEXP (x, 0, i), flags))
121 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED,
122 enum machine_mode mode,
123 int *punsignedp ATTRIBUTE_UNUSED,
124 const_tree funtype ATTRIBUTE_UNUSED,
125 int for_return ATTRIBUTE_UNUSED)
127 if (type != NULL_TREE && for_return == 2)
128 return promote_mode (type, mode, punsignedp);
133 default_promote_function_mode_always_promote (const_tree type,
134 enum machine_mode mode,
136 const_tree funtype ATTRIBUTE_UNUSED,
137 int for_return ATTRIBUTE_UNUSED)
139 return promote_mode (type, mode, punsignedp);
144 default_cc_modes_compatible (enum machine_mode m1, enum machine_mode m2)
152 default_return_in_memory (const_tree type,
153 const_tree fntype ATTRIBUTE_UNUSED)
155 return (TYPE_MODE (type) == BLKmode);
159 default_legitimize_address (rtx x, rtx orig_x ATTRIBUTE_UNUSED,
160 enum machine_mode mode ATTRIBUTE_UNUSED)
166 default_expand_builtin_saveregs (void)
168 error ("__builtin_saveregs not supported by this target");
173 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED,
174 enum machine_mode mode ATTRIBUTE_UNUSED,
175 tree type ATTRIBUTE_UNUSED,
176 int *pretend_arg_size ATTRIBUTE_UNUSED,
177 int second_time ATTRIBUTE_UNUSED)
181 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
184 default_builtin_setjmp_frame_value (void)
186 return virtual_stack_vars_rtx;
189 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
192 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED)
198 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED)
200 return (targetm.calls.setup_incoming_varargs
201 != default_setup_incoming_varargs);
205 default_eh_return_filter_mode (void)
207 return targetm.unwind_word_mode ();
211 default_libgcc_cmp_return_mode (void)
217 default_libgcc_shift_count_mode (void)
223 default_unwind_word_mode (void)
228 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
230 unsigned HOST_WIDE_INT
231 default_shift_truncation_mask (enum machine_mode mode)
233 return SHIFT_COUNT_TRUNCATED ? GET_MODE_BITSIZE (mode) - 1 : 0;
236 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
239 default_min_divisions_for_recip_mul (enum machine_mode mode ATTRIBUTE_UNUSED)
241 return have_insn_for (DIV, mode) ? 3 : 2;
244 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
247 default_mode_rep_extended (enum machine_mode mode ATTRIBUTE_UNUSED,
248 enum machine_mode mode_rep ATTRIBUTE_UNUSED)
253 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
256 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED)
261 /* Return machine mode for non-standard suffix
262 or VOIDmode if non-standard suffixes are unsupported. */
264 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED)
269 /* The generic C++ ABI specifies this is a 64-bit value. */
271 default_cxx_guard_type (void)
273 return long_long_integer_type_node;
277 /* Returns the size of the cookie to use when allocating an array
278 whose elements have the indicated TYPE. Assumes that it is already
279 known that a cookie is needed. */
282 default_cxx_get_cookie_size (tree type)
286 /* We need to allocate an additional max (sizeof (size_t), alignof
287 (true_type)) bytes. */
291 sizetype_size = size_in_bytes (sizetype);
292 type_align = size_int (TYPE_ALIGN_UNIT (type));
293 if (INT_CST_LT_UNSIGNED (type_align, sizetype_size))
294 cookie_size = sizetype_size;
296 cookie_size = type_align;
301 /* Return true if a parameter must be passed by reference. This version
302 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
305 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED,
306 enum machine_mode mode ATTRIBUTE_UNUSED, const_tree type ATTRIBUTE_UNUSED,
307 bool named_arg ATTRIBUTE_UNUSED)
309 return targetm.calls.must_pass_in_stack (mode, type);
312 /* Return true if a parameter follows callee copies conventions. This
313 version of the hook is true for all named arguments. */
316 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED,
317 enum machine_mode mode ATTRIBUTE_UNUSED,
318 const_tree type ATTRIBUTE_UNUSED, bool named)
323 /* Emit to STREAM the assembler syntax for insn operand X. */
326 default_print_operand (FILE *stream ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
327 int code ATTRIBUTE_UNUSED)
330 PRINT_OPERAND (stream, x, code);
336 /* Emit to STREAM the assembler syntax for an insn operand whose memory
340 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED,
341 rtx x ATTRIBUTE_UNUSED)
343 #ifdef PRINT_OPERAND_ADDRESS
344 PRINT_OPERAND_ADDRESS (stream, x);
350 /* Return true if CODE is a valid punctuation character for the
351 `print_operand' hook. */
354 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED)
356 #ifdef PRINT_OPERAND_PUNCT_VALID_P
357 return PRINT_OPERAND_PUNCT_VALID_P (code);
363 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
365 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED)
367 const char *skipped = name + (*name == '*' ? 1 : 0);
368 const char *stripped = targetm.strip_name_encoding (skipped);
369 if (*name != '*' && user_label_prefix[0])
370 stripped = ACONCAT ((user_label_prefix, stripped, NULL));
371 return get_identifier (stripped);
374 /* The default implementation of TARGET_ASM_OUTPUT_ADDR_CONST_EXTRA. */
377 default_asm_output_addr_const_extra (FILE *file ATTRIBUTE_UNUSED,
378 rtx x ATTRIBUTE_UNUSED)
380 #ifdef OUTPUT_ADDR_CONST_EXTRA
381 OUTPUT_ADDR_CONST_EXTRA (file, x, fail);
389 /* True if MODE is valid for the target. By "valid", we mean able to
390 be manipulated in non-trivial ways. In particular, this means all
391 the arithmetic is supported.
393 By default we guess this means that any C type is supported. If
394 we can't map the mode back to a type that would be available in C,
395 then reject it. Special case, here, is the double-word arithmetic
396 supported by optabs.c. */
399 default_scalar_mode_supported_p (enum machine_mode mode)
401 int precision = GET_MODE_PRECISION (mode);
403 switch (GET_MODE_CLASS (mode))
405 case MODE_PARTIAL_INT:
407 if (precision == CHAR_TYPE_SIZE)
409 if (precision == SHORT_TYPE_SIZE)
411 if (precision == INT_TYPE_SIZE)
413 if (precision == LONG_TYPE_SIZE)
415 if (precision == LONG_LONG_TYPE_SIZE)
417 if (precision == 2 * BITS_PER_WORD)
422 if (precision == FLOAT_TYPE_SIZE)
424 if (precision == DOUBLE_TYPE_SIZE)
426 if (precision == LONG_DOUBLE_TYPE_SIZE)
430 case MODE_DECIMAL_FLOAT:
442 /* Make some target macros useable by target-independent code. */
444 targhook_words_big_endian (void)
446 return !!WORDS_BIG_ENDIAN;
450 targhook_float_words_big_endian (void)
452 return !!FLOAT_WORDS_BIG_ENDIAN;
455 /* True if the target supports decimal floating point. */
458 default_decimal_float_supported_p (void)
460 return ENABLE_DECIMAL_FLOAT;
463 /* True if the target supports fixed-point arithmetic. */
466 default_fixed_point_supported_p (void)
468 return ENABLE_FIXED_POINT;
471 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
474 This function checks whether a given INSN is valid within a low-overhead
475 loop. If INSN is invalid it returns the reason for that, otherwise it
476 returns NULL. A called function may clobber any special registers required
477 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
478 register for branch on table instructions. We reject the doloop pattern in
482 default_invalid_within_doloop (const_rtx insn)
485 return "Function call in loop.";
487 if (JUMP_TABLE_DATA_P (insn))
488 return "Computed branch in the loop.";
493 /* Mapping of builtin functions to vectorized variants. */
496 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED,
497 tree type_out ATTRIBUTE_UNUSED,
498 tree type_in ATTRIBUTE_UNUSED)
503 /* Vectorized conversion. */
506 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED,
507 tree dest_type ATTRIBUTE_UNUSED,
508 tree src_type ATTRIBUTE_UNUSED)
513 /* Default vectorizer cost model values. */
516 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
517 tree vectype ATTRIBUTE_UNUSED,
518 int misalign ATTRIBUTE_UNUSED)
520 switch (type_of_cost)
530 case cond_branch_not_taken:
535 case unaligned_store:
538 case cond_branch_taken:
549 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED,
550 bool md_fn ATTRIBUTE_UNUSED,
551 bool sqrt ATTRIBUTE_UNUSED)
557 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
558 cumulative_args_t ca ATTRIBUTE_UNUSED,
559 enum machine_mode mode ATTRIBUTE_UNUSED,
560 const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
566 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
567 cumulative_args_t ca ATTRIBUTE_UNUSED,
568 enum machine_mode mode ATTRIBUTE_UNUSED,
569 const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
575 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
576 cumulative_args_t ca ATTRIBUTE_UNUSED,
577 enum machine_mode mode ATTRIBUTE_UNUSED,
578 tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
584 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED,
585 enum machine_mode mode ATTRIBUTE_UNUSED,
586 const_tree type ATTRIBUTE_UNUSED,
587 bool named ATTRIBUTE_UNUSED)
593 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
594 enum machine_mode mode ATTRIBUTE_UNUSED,
595 const_tree type ATTRIBUTE_UNUSED,
596 bool named ATTRIBUTE_UNUSED)
602 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
603 enum machine_mode mode ATTRIBUTE_UNUSED,
604 const_tree type ATTRIBUTE_UNUSED,
605 bool named ATTRIBUTE_UNUSED)
611 default_function_arg_boundary (enum machine_mode mode ATTRIBUTE_UNUSED,
612 const_tree type ATTRIBUTE_UNUSED)
614 return PARM_BOUNDARY;
618 default_function_arg_round_boundary (enum machine_mode mode ATTRIBUTE_UNUSED,
619 const_tree type ATTRIBUTE_UNUSED)
621 return PARM_BOUNDARY;
625 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
630 hook_invalid_arg_for_unprototyped_fn (
631 const_tree typelist ATTRIBUTE_UNUSED,
632 const_tree funcdecl ATTRIBUTE_UNUSED,
633 const_tree val ATTRIBUTE_UNUSED)
638 /* Initialize the stack protection decls. */
640 /* Stack protection related decls living in libgcc. */
641 static GTY(()) tree stack_chk_guard_decl;
644 default_stack_protect_guard (void)
646 tree t = stack_chk_guard_decl;
652 t = build_decl (UNKNOWN_LOCATION,
653 VAR_DECL, get_identifier ("__stack_chk_guard"),
657 DECL_EXTERNAL (t) = 1;
659 TREE_THIS_VOLATILE (t) = 1;
660 DECL_ARTIFICIAL (t) = 1;
661 DECL_IGNORED_P (t) = 1;
663 /* Do not share RTL as the declaration is visible outside of
666 RTX_FLAG (x, used) = 1;
668 stack_chk_guard_decl = t;
674 static GTY(()) tree stack_chk_fail_decl;
677 default_external_stack_protect_fail (void)
679 tree t = stack_chk_fail_decl;
683 t = build_function_type_list (void_type_node, NULL_TREE);
684 t = build_decl (UNKNOWN_LOCATION,
685 FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
688 DECL_EXTERNAL (t) = 1;
690 TREE_THIS_VOLATILE (t) = 1;
691 TREE_NOTHROW (t) = 1;
692 DECL_ARTIFICIAL (t) = 1;
693 DECL_IGNORED_P (t) = 1;
694 DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
695 DECL_VISIBILITY_SPECIFIED (t) = 1;
697 stack_chk_fail_decl = t;
700 return build_call_expr (t, 0);
704 default_hidden_stack_protect_fail (void)
706 #ifndef HAVE_GAS_HIDDEN
707 return default_external_stack_protect_fail ();
709 tree t = stack_chk_fail_decl;
712 return default_external_stack_protect_fail ();
716 t = build_function_type_list (void_type_node, NULL_TREE);
717 t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
718 get_identifier ("__stack_chk_fail_local"), t);
721 DECL_EXTERNAL (t) = 1;
723 TREE_THIS_VOLATILE (t) = 1;
724 TREE_NOTHROW (t) = 1;
725 DECL_ARTIFICIAL (t) = 1;
726 DECL_IGNORED_P (t) = 1;
727 DECL_VISIBILITY_SPECIFIED (t) = 1;
728 DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
730 stack_chk_fail_decl = t;
733 return build_call_expr (t, 0);
738 hook_bool_const_rtx_commutative_p (const_rtx x,
739 int outer_code ATTRIBUTE_UNUSED)
741 return COMMUTATIVE_P (x);
745 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
746 const_tree fn_decl_or_type,
747 bool outgoing ATTRIBUTE_UNUSED)
749 /* The old interface doesn't handle receiving the function type. */
751 && !DECL_P (fn_decl_or_type))
752 fn_decl_or_type = NULL;
754 #ifdef FUNCTION_VALUE
755 return FUNCTION_VALUE (ret_type, fn_decl_or_type);
762 default_libcall_value (enum machine_mode mode ATTRIBUTE_UNUSED,
763 const_rtx fun ATTRIBUTE_UNUSED)
766 return LIBCALL_VALUE (mode);
772 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
775 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
777 #ifdef FUNCTION_VALUE_REGNO_P
778 return FUNCTION_VALUE_REGNO_P (regno);
785 default_internal_arg_pointer (void)
787 /* If the reg that the virtual arg pointer will be translated into is
788 not a fixed reg or is the stack pointer, make a copy of the virtual
789 arg pointer, and address parms via the copy. The frame pointer is
790 considered fixed even though it is not marked as such. */
791 if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
792 || ! (fixed_regs[ARG_POINTER_REGNUM]
793 || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
794 return copy_to_reg (virtual_incoming_args_rtx);
796 return virtual_incoming_args_rtx;
800 default_static_chain (const_tree fndecl, bool incoming_p)
802 if (!DECL_STATIC_CHAIN (fndecl))
807 #ifdef STATIC_CHAIN_INCOMING_REGNUM
808 return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
812 #ifdef STATIC_CHAIN_REGNUM
813 return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
817 static bool issued_error;
821 sorry ("nested functions not supported on this target");
824 /* It really doesn't matter what we return here, so long at it
825 doesn't cause the rest of the compiler to crash. */
826 return gen_rtx_MEM (Pmode, stack_pointer_rtx);
831 default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
832 rtx ARG_UNUSED (r_chain))
834 sorry ("nested function trampolines not supported on this target");
838 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED,
839 tree funtype ATTRIBUTE_UNUSED,
840 int size ATTRIBUTE_UNUSED)
846 default_branch_target_register_class (void)
852 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
853 reg_class_t reload_class_i ATTRIBUTE_UNUSED,
854 enum machine_mode reload_mode ATTRIBUTE_UNUSED,
855 secondary_reload_info *sri)
857 enum reg_class rclass = NO_REGS;
858 enum reg_class reload_class = (enum reg_class) reload_class_i;
860 if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
862 sri->icode = sri->prev_sri->t_icode;
865 #ifdef SECONDARY_INPUT_RELOAD_CLASS
867 rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x);
869 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
871 rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x);
873 if (rclass != NO_REGS)
876 = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
879 if (icode != CODE_FOR_nothing
880 && !insn_operand_matches (icode, in_p, x))
881 icode = CODE_FOR_nothing;
882 else if (icode != CODE_FOR_nothing)
884 const char *insn_constraint, *scratch_constraint;
885 char insn_letter, scratch_letter;
886 enum reg_class insn_class, scratch_class;
888 gcc_assert (insn_data[(int) icode].n_operands == 3);
889 insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
890 if (!*insn_constraint)
891 insn_class = ALL_REGS;
896 gcc_assert (*insn_constraint == '=');
899 insn_letter = *insn_constraint;
901 = (insn_letter == 'r' ? GENERAL_REGS
902 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) insn_letter,
904 gcc_assert (insn_class != NO_REGS);
907 scratch_constraint = insn_data[(int) icode].operand[2].constraint;
908 /* The scratch register's constraint must start with "=&",
909 except for an input reload, where only "=" is necessary,
910 and where it might be beneficial to re-use registers from
912 gcc_assert (scratch_constraint[0] == '='
913 && (in_p || scratch_constraint[1] == '&'));
914 scratch_constraint++;
915 if (*scratch_constraint == '&')
916 scratch_constraint++;
917 scratch_letter = *scratch_constraint;
919 = (scratch_letter == 'r' ? GENERAL_REGS
920 : REG_CLASS_FROM_CONSTRAINT ((unsigned char) scratch_letter,
921 scratch_constraint));
923 if (reg_class_subset_p (reload_class, insn_class))
925 gcc_assert (scratch_class == rclass);
932 if (rclass == NO_REGS)
935 sri->t_icode = icode;
940 /* By default, if flag_pic is true, then neither local nor global relocs
941 should be placed in readonly memory. */
944 default_reloc_rw_mask (void)
946 return flag_pic ? 3 : 0;
949 /* By default, do no modification. */
950 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
957 default_builtin_vector_alignment_reachable (const_tree type, bool is_packed)
962 /* Assuming that types whose size is > pointer-size are not guaranteed to be
963 naturally aligned. */
964 if (tree_int_cst_compare (TYPE_SIZE (type), bitsize_int (POINTER_SIZE)) > 0)
967 /* Assuming that types whose size is <= pointer-size
968 are naturally aligned. */
972 /* By default, assume that a target supports any factor of misalignment
973 memory access if it supports movmisalign patten.
974 is_packed is true if the memory access is defined in a packed struct. */
976 default_builtin_support_vector_misalignment (enum machine_mode mode,
984 if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
989 /* By default, only attempt to parallelize bitwise operations, and
990 possibly adds/subtracts using bit-twiddling. */
993 default_preferred_simd_mode (enum machine_mode mode ATTRIBUTE_UNUSED)
998 /* By default only the size derived from the preferred vector mode
1002 default_autovectorize_vector_sizes (void)
1007 /* Determine whether or not a pointer mode is valid. Assume defaults
1008 of ptr_mode or Pmode - can be overridden. */
1010 default_valid_pointer_mode (enum machine_mode mode)
1012 return (mode == ptr_mode || mode == Pmode);
1015 /* Determine whether the memory reference specified by REF may alias
1016 the C libraries errno location. */
1018 default_ref_may_alias_errno (ao_ref *ref)
1020 tree base = ao_ref_base (ref);
1021 /* The default implementation assumes the errno location is
1022 a declaration of type int or is always accessed via a
1023 pointer to int. We assume that accesses to errno are
1024 not deliberately obfuscated (even in conforming ways). */
1025 if (TYPE_UNSIGNED (TREE_TYPE (base))
1026 || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1028 /* The default implementation assumes an errno location
1029 declaration is never defined in the current compilation unit. */
1031 && !TREE_STATIC (base))
1033 else if (TREE_CODE (base) == MEM_REF
1034 && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1036 struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1037 return !pi || pi->pt.anything || pi->pt.nonlocal;
1042 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1043 for the generic address space only. */
1046 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1048 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace));
1052 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1053 for the generic address space only. */
1056 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1058 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace));
1062 /* Named address space version of valid_pointer_mode. */
1065 default_addr_space_valid_pointer_mode (enum machine_mode mode, addr_space_t as)
1067 if (!ADDR_SPACE_GENERIC_P (as))
1068 return (mode == targetm.addr_space.pointer_mode (as)
1069 || mode == targetm.addr_space.address_mode (as));
1071 return targetm.valid_pointer_mode (mode);
1074 /* Some places still assume that all pointer or address modes are the
1075 standard Pmode and ptr_mode. These optimizations become invalid if
1076 the target actually supports multiple different modes. For now,
1077 we disable such optimizations on such targets, using this function. */
1080 target_default_pointer_address_modes_p (void)
1082 if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1084 if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1090 /* Named address space version of legitimate_address_p. */
1093 default_addr_space_legitimate_address_p (enum machine_mode mode, rtx mem,
1094 bool strict, addr_space_t as)
1096 if (!ADDR_SPACE_GENERIC_P (as))
1099 return targetm.legitimate_address_p (mode, mem, strict);
1102 /* Named address space version of LEGITIMIZE_ADDRESS. */
1105 default_addr_space_legitimize_address (rtx x, rtx oldx,
1106 enum machine_mode mode, addr_space_t as)
1108 if (!ADDR_SPACE_GENERIC_P (as))
1111 return targetm.legitimize_address (x, oldx, mode);
1114 /* The default hook for determining if one named address space is a subset of
1115 another and to return which address space to use as the common address
1119 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1121 return (subset == superset);
1124 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1125 called for targets with only a generic address space. */
1128 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1129 tree from_type ATTRIBUTE_UNUSED,
1130 tree to_type ATTRIBUTE_UNUSED)
1136 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1141 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1144 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED)
1146 #ifdef GO_IF_MODE_DEPENDENT_ADDRESS
1148 GO_IF_MODE_DEPENDENT_ADDRESS (CONST_CAST_RTX (addr), win);
1150 /* Label `win' might (not) be used via GO_IF_MODE_DEPENDENT_ADDRESS. */
1151 win: ATTRIBUTE_UNUSED_LABEL
1162 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1163 tree ARG_UNUSED (name),
1164 tree ARG_UNUSED (args),
1165 int ARG_UNUSED (flags))
1167 warning (OPT_Wattributes,
1168 "target attribute is not supported on this machine");
1174 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1175 tree ARG_UNUSED (pop_target))
1177 warning (OPT_Wpragmas,
1178 "#pragma GCC target is not supported for this machine");
1184 default_target_can_inline_p (tree caller, tree callee)
1187 tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1188 tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1190 /* If callee has no option attributes, then it is ok to inline */
1194 /* If caller has no option attributes, but callee does then it is not ok to
1196 else if (!caller_opts)
1199 /* If both caller and callee have attributes, assume that if the
1200 pointer is different, the two functions have different target
1201 options since build_target_option_node uses a hash table for the
1204 ret = (callee_opts == caller_opts);
1210 # define HAVE_casesi 0
1213 /* If the machine does not have a case insn that compares the bounds,
1214 this means extra overhead for dispatch tables, which raises the
1215 threshold for using them. */
1217 unsigned int default_case_values_threshold (void)
1219 return (HAVE_casesi ? 4 : 5);
1223 default_have_conditional_execution (void)
1225 #ifdef HAVE_conditional_execution
1226 return HAVE_conditional_execution;
1232 /* Compute cost of moving registers to/from memory. */
1235 default_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED,
1236 reg_class_t rclass ATTRIBUTE_UNUSED,
1237 bool in ATTRIBUTE_UNUSED)
1239 #ifndef MEMORY_MOVE_COST
1240 return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1242 return MEMORY_MOVE_COST (mode, (enum reg_class) rclass, in);
1246 /* Compute cost of moving data from a register of class FROM to one of
1250 default_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED,
1251 reg_class_t from ATTRIBUTE_UNUSED,
1252 reg_class_t to ATTRIBUTE_UNUSED)
1254 #ifndef REGISTER_MOVE_COST
1257 return REGISTER_MOVE_COST (mode, (enum reg_class) from, (enum reg_class) to);
1262 default_profile_before_prologue (void)
1264 #ifdef PROFILE_BEFORE_PROLOGUE
1271 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1274 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1277 #ifdef PREFERRED_RELOAD_CLASS
1278 return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1284 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1287 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1290 #ifdef PREFERRED_OUTPUT_RELOAD_CLASS
1291 return PREFERRED_OUTPUT_RELOAD_CLASS (x, (enum reg_class) rclass);
1297 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1299 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1304 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1307 default_class_likely_spilled_p (reg_class_t rclass)
1309 return (reg_class_size[(int) rclass] == 1);
1312 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1315 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED,
1316 enum machine_mode mode ATTRIBUTE_UNUSED)
1318 #ifdef CLASS_MAX_NREGS
1319 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass, mode);
1321 return ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD);
1325 /* Determine the debugging unwind mechanism for the target. */
1327 enum unwind_info_type
1328 default_debug_unwind_info (void)
1330 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1331 /* ??? Change all users to the hook, then poison this. */
1332 #ifdef DWARF2_FRAME_INFO
1333 if (DWARF2_FRAME_INFO)
1337 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1338 #ifdef DWARF2_DEBUGGING_INFO
1339 if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1346 /* To be used by targets where reg_raw_mode doesn't return the right
1347 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1350 default_get_reg_raw_mode(int regno)
1352 return reg_raw_mode[regno];
1355 /* Return true if the state of option OPTION should be stored in PCH files
1356 and checked by default_pch_valid_p. Store the option's current state
1360 option_affects_pch_p (int option, struct cl_option_state *state)
1362 if ((cl_options[option].flags & CL_TARGET) == 0)
1364 if (option_flag_var (option, &global_options) == &target_flags)
1365 if (targetm.check_pch_target_flags)
1367 return get_option_state (&global_options, option, state);
1370 /* Default version of get_pch_validity.
1371 By default, every flag difference is fatal; that will be mostly right for
1372 most targets, but completely right for very few. */
1375 default_get_pch_validity (size_t *sz)
1377 struct cl_option_state state;
1382 if (targetm.check_pch_target_flags)
1383 *sz += sizeof (target_flags);
1384 for (i = 0; i < cl_options_count; i++)
1385 if (option_affects_pch_p (i, &state))
1388 result = r = XNEWVEC (char, *sz);
1392 if (targetm.check_pch_target_flags)
1394 memcpy (r, &target_flags, sizeof (target_flags));
1395 r += sizeof (target_flags);
1398 for (i = 0; i < cl_options_count; i++)
1399 if (option_affects_pch_p (i, &state))
1401 memcpy (r, state.data, state.size);
1408 /* Return a message which says that a PCH file was created with a different
1409 setting of OPTION. */
1412 pch_option_mismatch (const char *option)
1416 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1418 return _("out of memory");
1422 /* Default version of pch_valid_p. */
1425 default_pch_valid_p (const void *data_p, size_t len)
1427 struct cl_option_state state;
1428 const char *data = (const char *)data_p;
1431 /* -fpic and -fpie also usually make a PCH invalid. */
1432 if (data[0] != flag_pic)
1433 return _("created and used with different settings of -fpic");
1434 if (data[1] != flag_pie)
1435 return _("created and used with different settings of -fpie");
1438 /* Check target_flags. */
1439 if (targetm.check_pch_target_flags)
1444 memcpy (&tf, data, sizeof (target_flags));
1445 data += sizeof (target_flags);
1446 len -= sizeof (target_flags);
1447 r = targetm.check_pch_target_flags (tf);
1452 for (i = 0; i < cl_options_count; i++)
1453 if (option_affects_pch_p (i, &state))
1455 if (memcmp (data, state.data, state.size) != 0)
1456 return pch_option_mismatch (cl_options[i].opt_text);
1464 #include "gt-targhooks.h"