1 /* Default target hook functions.
2 Copyright (C) 2003-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* The migration of target macros to target hooks works as follows:
22 1. Create a target hook that uses the existing target macros to
23 implement the same functionality.
25 2. Convert all the MI files to use the hook instead of the macro.
27 3. Repeat for a majority of the remaining target macros. This will
30 4. Tell target maintainers to start migrating.
32 5. Eventually convert the backends to override the hook instead of
33 defining the macros. This will take some time too.
35 6. TBD when, poison the macros. Unmigrated targets will break at
38 Note that we expect steps 1-3 to be done by the people that
39 understand what the MI does with each macro, and step 5 to be done
40 by the target maintainers for their respective targets.
42 Note that steps 1 and 2 don't have to be done together, but no
43 target can override the new hook until step 2 is complete for it.
45 Once the macros are poisoned, we will revert to the old migration
46 rules - migrate the macro, callers, and targets all at once. This
47 comment can thus be removed at that point. */
51 #include "coretypes.h"
58 #include "double-int.h"
65 #include "fold-const.h"
66 #include "stor-layout.h"
70 #include "diagnostic-core.h"
71 #include "hard-reg-set.h"
76 #include "target-def.h"
79 #include "insn-codes.h"
84 #include "tree-ssa-alias.h"
85 #include "gimple-expr.h"
87 #include "stringpool.h"
88 #include "tree-ssanames.h"
92 default_legitimate_address_p (machine_mode mode ATTRIBUTE_UNUSED,
93 rtx addr ATTRIBUTE_UNUSED,
94 bool strict ATTRIBUTE_UNUSED)
96 #ifdef GO_IF_LEGITIMATE_ADDRESS
97 /* Defer to the old implementation using a goto. */
99 return strict_memory_address_p (mode, addr);
101 return memory_address_p (mode, addr);
108 default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
110 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
111 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file, fun);
116 default_unspec_may_trap_p (const_rtx x, unsigned flags)
120 /* Any floating arithmetic may trap. */
121 if ((SCALAR_FLOAT_MODE_P (GET_MODE (x)) && flag_trapping_math))
124 for (i = 0; i < XVECLEN (x, 0); ++i)
126 if (may_trap_p_1 (XVECEXP (x, 0, i), flags))
134 default_promote_function_mode (const_tree type ATTRIBUTE_UNUSED,
136 int *punsignedp ATTRIBUTE_UNUSED,
137 const_tree funtype ATTRIBUTE_UNUSED,
138 int for_return ATTRIBUTE_UNUSED)
140 if (type != NULL_TREE && for_return == 2)
141 return promote_mode (type, mode, punsignedp);
146 default_promote_function_mode_always_promote (const_tree type,
149 const_tree funtype ATTRIBUTE_UNUSED,
150 int for_return ATTRIBUTE_UNUSED)
152 return promote_mode (type, mode, punsignedp);
156 default_cc_modes_compatible (machine_mode m1, machine_mode m2)
164 default_return_in_memory (const_tree type,
165 const_tree fntype ATTRIBUTE_UNUSED)
167 return (TYPE_MODE (type) == BLKmode);
171 default_legitimize_address (rtx x, rtx orig_x ATTRIBUTE_UNUSED,
172 machine_mode mode ATTRIBUTE_UNUSED)
178 default_legitimize_address_displacement (rtx *disp ATTRIBUTE_UNUSED,
179 rtx *offset ATTRIBUTE_UNUSED,
180 machine_mode mode ATTRIBUTE_UNUSED)
186 default_expand_builtin_saveregs (void)
188 error ("__builtin_saveregs not supported by this target");
193 default_setup_incoming_varargs (cumulative_args_t ca ATTRIBUTE_UNUSED,
194 machine_mode mode ATTRIBUTE_UNUSED,
195 tree type ATTRIBUTE_UNUSED,
196 int *pretend_arg_size ATTRIBUTE_UNUSED,
197 int second_time ATTRIBUTE_UNUSED)
201 /* The default implementation of TARGET_BUILTIN_SETJMP_FRAME_VALUE. */
204 default_builtin_setjmp_frame_value (void)
206 return virtual_stack_vars_rtx;
209 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns false. */
212 hook_bool_CUMULATIVE_ARGS_false (cumulative_args_t ca ATTRIBUTE_UNUSED)
218 default_pretend_outgoing_varargs_named (cumulative_args_t ca ATTRIBUTE_UNUSED)
220 return (targetm.calls.setup_incoming_varargs
221 != default_setup_incoming_varargs);
225 default_eh_return_filter_mode (void)
227 return targetm.unwind_word_mode ();
231 default_libgcc_cmp_return_mode (void)
237 default_libgcc_shift_count_mode (void)
243 default_unwind_word_mode (void)
248 /* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
250 unsigned HOST_WIDE_INT
251 default_shift_truncation_mask (machine_mode mode)
253 return SHIFT_COUNT_TRUNCATED ? GET_MODE_BITSIZE (mode) - 1 : 0;
256 /* The default implementation of TARGET_MIN_DIVISIONS_FOR_RECIP_MUL. */
259 default_min_divisions_for_recip_mul (machine_mode mode ATTRIBUTE_UNUSED)
261 return have_insn_for (DIV, mode) ? 3 : 2;
264 /* The default implementation of TARGET_MODE_REP_EXTENDED. */
267 default_mode_rep_extended (machine_mode mode ATTRIBUTE_UNUSED,
268 machine_mode mode_rep ATTRIBUTE_UNUSED)
273 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
276 hook_bool_CUMULATIVE_ARGS_true (cumulative_args_t a ATTRIBUTE_UNUSED)
281 /* Return machine mode for non-standard suffix
282 or VOIDmode if non-standard suffixes are unsupported. */
284 default_mode_for_suffix (char suffix ATTRIBUTE_UNUSED)
289 /* The generic C++ ABI specifies this is a 64-bit value. */
291 default_cxx_guard_type (void)
293 return long_long_integer_type_node;
296 /* Returns the size of the cookie to use when allocating an array
297 whose elements have the indicated TYPE. Assumes that it is already
298 known that a cookie is needed. */
301 default_cxx_get_cookie_size (tree type)
305 /* We need to allocate an additional max (sizeof (size_t), alignof
306 (true_type)) bytes. */
310 sizetype_size = size_in_bytes (sizetype);
311 type_align = size_int (TYPE_ALIGN_UNIT (type));
312 if (tree_int_cst_lt (type_align, sizetype_size))
313 cookie_size = sizetype_size;
315 cookie_size = type_align;
320 /* Return true if a parameter must be passed by reference. This version
321 of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
324 hook_pass_by_reference_must_pass_in_stack (cumulative_args_t c ATTRIBUTE_UNUSED,
325 machine_mode mode ATTRIBUTE_UNUSED, const_tree type ATTRIBUTE_UNUSED,
326 bool named_arg ATTRIBUTE_UNUSED)
328 return targetm.calls.must_pass_in_stack (mode, type);
331 /* Return true if a parameter follows callee copies conventions. This
332 version of the hook is true for all named arguments. */
335 hook_callee_copies_named (cumulative_args_t ca ATTRIBUTE_UNUSED,
336 machine_mode mode ATTRIBUTE_UNUSED,
337 const_tree type ATTRIBUTE_UNUSED, bool named)
342 /* Emit to STREAM the assembler syntax for insn operand X. */
345 default_print_operand (FILE *stream ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
346 int code ATTRIBUTE_UNUSED)
349 PRINT_OPERAND (stream, x, code);
355 /* Emit to STREAM the assembler syntax for an insn operand whose memory
359 default_print_operand_address (FILE *stream ATTRIBUTE_UNUSED,
360 rtx x ATTRIBUTE_UNUSED)
362 #ifdef PRINT_OPERAND_ADDRESS
363 PRINT_OPERAND_ADDRESS (stream, x);
369 /* Return true if CODE is a valid punctuation character for the
370 `print_operand' hook. */
373 default_print_operand_punct_valid_p (unsigned char code ATTRIBUTE_UNUSED)
375 #ifdef PRINT_OPERAND_PUNCT_VALID_P
376 return PRINT_OPERAND_PUNCT_VALID_P (code);
382 /* The default implementation of TARGET_MANGLE_ASSEMBLER_NAME. */
384 default_mangle_assembler_name (const char *name ATTRIBUTE_UNUSED)
386 const char *skipped = name + (*name == '*' ? 1 : 0);
387 const char *stripped = targetm.strip_name_encoding (skipped);
388 if (*name != '*' && user_label_prefix[0])
389 stripped = ACONCAT ((user_label_prefix, stripped, NULL));
390 return get_identifier (stripped);
393 /* True if MODE is valid for the target. By "valid", we mean able to
394 be manipulated in non-trivial ways. In particular, this means all
395 the arithmetic is supported.
397 By default we guess this means that any C type is supported. If
398 we can't map the mode back to a type that would be available in C,
399 then reject it. Special case, here, is the double-word arithmetic
400 supported by optabs.c. */
403 default_scalar_mode_supported_p (machine_mode mode)
405 int precision = GET_MODE_PRECISION (mode);
407 switch (GET_MODE_CLASS (mode))
409 case MODE_PARTIAL_INT:
411 if (precision == CHAR_TYPE_SIZE)
413 if (precision == SHORT_TYPE_SIZE)
415 if (precision == INT_TYPE_SIZE)
417 if (precision == LONG_TYPE_SIZE)
419 if (precision == LONG_LONG_TYPE_SIZE)
421 if (precision == 2 * BITS_PER_WORD)
426 if (precision == FLOAT_TYPE_SIZE)
428 if (precision == DOUBLE_TYPE_SIZE)
430 if (precision == LONG_DOUBLE_TYPE_SIZE)
434 case MODE_DECIMAL_FLOAT:
446 /* Return true if libgcc supports floating-point mode MODE (known to
447 be supported as a scalar mode). */
450 default_libgcc_floating_mode_supported_p (machine_mode mode)
473 /* Make some target macros useable by target-independent code. */
475 targhook_words_big_endian (void)
477 return !!WORDS_BIG_ENDIAN;
481 targhook_float_words_big_endian (void)
483 return !!FLOAT_WORDS_BIG_ENDIAN;
486 /* True if the target supports floating-point exceptions and rounding
490 default_float_exceptions_rounding_supported_p (void)
499 /* True if the target supports decimal floating point. */
502 default_decimal_float_supported_p (void)
504 return ENABLE_DECIMAL_FLOAT;
507 /* True if the target supports fixed-point arithmetic. */
510 default_fixed_point_supported_p (void)
512 return ENABLE_FIXED_POINT;
515 /* True if the target supports GNU indirect functions. */
518 default_has_ifunc_p (void)
520 return HAVE_GNU_INDIRECT_FUNCTION;
523 /* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
526 This function checks whether a given INSN is valid within a low-overhead
527 loop. If INSN is invalid it returns the reason for that, otherwise it
528 returns NULL. A called function may clobber any special registers required
529 for low-overhead looping. Additionally, some targets (eg, PPC) use the count
530 register for branch on table instructions. We reject the doloop pattern in
534 default_invalid_within_doloop (const rtx_insn *insn)
537 return "Function call in loop.";
539 if (tablejump_p (insn, NULL, NULL) || computed_jump_p (insn))
540 return "Computed branch in the loop.";
545 /* Mapping of builtin functions to vectorized variants. */
548 default_builtin_vectorized_function (tree fndecl ATTRIBUTE_UNUSED,
549 tree type_out ATTRIBUTE_UNUSED,
550 tree type_in ATTRIBUTE_UNUSED)
555 /* Vectorized conversion. */
558 default_builtin_vectorized_conversion (unsigned int code ATTRIBUTE_UNUSED,
559 tree dest_type ATTRIBUTE_UNUSED,
560 tree src_type ATTRIBUTE_UNUSED)
565 /* Default vectorizer cost model values. */
568 default_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
570 int misalign ATTRIBUTE_UNUSED)
574 switch (type_of_cost)
584 case cond_branch_not_taken:
586 case vec_promote_demote:
590 case unaligned_store:
593 case cond_branch_taken:
597 elements = TYPE_VECTOR_SUBPARTS (vectype);
598 return elements / 2 + 1;
608 default_builtin_reciprocal (unsigned int fn ATTRIBUTE_UNUSED,
609 bool md_fn ATTRIBUTE_UNUSED,
610 bool sqrt ATTRIBUTE_UNUSED)
616 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
617 cumulative_args_t ca ATTRIBUTE_UNUSED,
618 machine_mode mode ATTRIBUTE_UNUSED,
619 const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
625 hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
626 cumulative_args_t ca ATTRIBUTE_UNUSED,
627 machine_mode mode ATTRIBUTE_UNUSED,
628 const_tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
634 hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
635 cumulative_args_t ca ATTRIBUTE_UNUSED,
636 machine_mode mode ATTRIBUTE_UNUSED,
637 tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
643 default_function_arg_advance (cumulative_args_t ca ATTRIBUTE_UNUSED,
644 machine_mode mode ATTRIBUTE_UNUSED,
645 const_tree type ATTRIBUTE_UNUSED,
646 bool named ATTRIBUTE_UNUSED)
652 default_function_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
653 machine_mode mode ATTRIBUTE_UNUSED,
654 const_tree type ATTRIBUTE_UNUSED,
655 bool named ATTRIBUTE_UNUSED)
661 default_function_incoming_arg (cumulative_args_t ca ATTRIBUTE_UNUSED,
662 machine_mode mode ATTRIBUTE_UNUSED,
663 const_tree type ATTRIBUTE_UNUSED,
664 bool named ATTRIBUTE_UNUSED)
670 default_function_arg_boundary (machine_mode mode ATTRIBUTE_UNUSED,
671 const_tree type ATTRIBUTE_UNUSED)
673 return PARM_BOUNDARY;
677 default_function_arg_round_boundary (machine_mode mode ATTRIBUTE_UNUSED,
678 const_tree type ATTRIBUTE_UNUSED)
680 return PARM_BOUNDARY;
684 hook_void_bitmap (bitmap regs ATTRIBUTE_UNUSED)
689 hook_invalid_arg_for_unprototyped_fn (
690 const_tree typelist ATTRIBUTE_UNUSED,
691 const_tree funcdecl ATTRIBUTE_UNUSED,
692 const_tree val ATTRIBUTE_UNUSED)
697 /* Initialize the stack protection decls. */
699 /* Stack protection related decls living in libgcc. */
700 static GTY(()) tree stack_chk_guard_decl;
703 default_stack_protect_guard (void)
705 tree t = stack_chk_guard_decl;
711 t = build_decl (UNKNOWN_LOCATION,
712 VAR_DECL, get_identifier ("__stack_chk_guard"),
716 DECL_EXTERNAL (t) = 1;
718 TREE_THIS_VOLATILE (t) = 1;
719 DECL_ARTIFICIAL (t) = 1;
720 DECL_IGNORED_P (t) = 1;
722 /* Do not share RTL as the declaration is visible outside of
725 RTX_FLAG (x, used) = 1;
727 stack_chk_guard_decl = t;
733 static GTY(()) tree stack_chk_fail_decl;
736 default_external_stack_protect_fail (void)
738 tree t = stack_chk_fail_decl;
742 t = build_function_type_list (void_type_node, NULL_TREE);
743 t = build_decl (UNKNOWN_LOCATION,
744 FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
747 DECL_EXTERNAL (t) = 1;
749 TREE_THIS_VOLATILE (t) = 1;
750 TREE_NOTHROW (t) = 1;
751 DECL_ARTIFICIAL (t) = 1;
752 DECL_IGNORED_P (t) = 1;
753 DECL_VISIBILITY (t) = VISIBILITY_DEFAULT;
754 DECL_VISIBILITY_SPECIFIED (t) = 1;
756 stack_chk_fail_decl = t;
759 return build_call_expr (t, 0);
763 default_hidden_stack_protect_fail (void)
765 #ifndef HAVE_GAS_HIDDEN
766 return default_external_stack_protect_fail ();
768 tree t = stack_chk_fail_decl;
771 return default_external_stack_protect_fail ();
775 t = build_function_type_list (void_type_node, NULL_TREE);
776 t = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
777 get_identifier ("__stack_chk_fail_local"), t);
780 DECL_EXTERNAL (t) = 1;
782 TREE_THIS_VOLATILE (t) = 1;
783 TREE_NOTHROW (t) = 1;
784 DECL_ARTIFICIAL (t) = 1;
785 DECL_IGNORED_P (t) = 1;
786 DECL_VISIBILITY_SPECIFIED (t) = 1;
787 DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
789 stack_chk_fail_decl = t;
792 return build_call_expr (t, 0);
797 hook_bool_const_rtx_commutative_p (const_rtx x,
798 int outer_code ATTRIBUTE_UNUSED)
800 return COMMUTATIVE_P (x);
804 default_function_value (const_tree ret_type ATTRIBUTE_UNUSED,
805 const_tree fn_decl_or_type,
806 bool outgoing ATTRIBUTE_UNUSED)
808 /* The old interface doesn't handle receiving the function type. */
810 && !DECL_P (fn_decl_or_type))
811 fn_decl_or_type = NULL;
813 #ifdef FUNCTION_VALUE
814 return FUNCTION_VALUE (ret_type, fn_decl_or_type);
821 default_libcall_value (machine_mode mode ATTRIBUTE_UNUSED,
822 const_rtx fun ATTRIBUTE_UNUSED)
825 return LIBCALL_VALUE (mode);
831 /* The default hook for TARGET_FUNCTION_VALUE_REGNO_P. */
834 default_function_value_regno_p (const unsigned int regno ATTRIBUTE_UNUSED)
836 #ifdef FUNCTION_VALUE_REGNO_P
837 return FUNCTION_VALUE_REGNO_P (regno);
844 default_internal_arg_pointer (void)
846 /* If the reg that the virtual arg pointer will be translated into is
847 not a fixed reg or is the stack pointer, make a copy of the virtual
848 arg pointer, and address parms via the copy. The frame pointer is
849 considered fixed even though it is not marked as such. */
850 if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM
851 || ! (fixed_regs[ARG_POINTER_REGNUM]
852 || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM)))
853 return copy_to_reg (virtual_incoming_args_rtx);
855 return virtual_incoming_args_rtx;
859 default_static_chain (const_tree ARG_UNUSED (fndecl_or_type), bool incoming_p)
863 #ifdef STATIC_CHAIN_INCOMING_REGNUM
864 return gen_rtx_REG (Pmode, STATIC_CHAIN_INCOMING_REGNUM);
868 #ifdef STATIC_CHAIN_REGNUM
869 return gen_rtx_REG (Pmode, STATIC_CHAIN_REGNUM);
873 static bool issued_error;
877 sorry ("nested functions not supported on this target");
880 /* It really doesn't matter what we return here, so long at it
881 doesn't cause the rest of the compiler to crash. */
882 return gen_rtx_MEM (Pmode, stack_pointer_rtx);
887 default_trampoline_init (rtx ARG_UNUSED (m_tramp), tree ARG_UNUSED (t_func),
888 rtx ARG_UNUSED (r_chain))
890 sorry ("nested function trampolines not supported on this target");
894 default_return_pops_args (tree fundecl ATTRIBUTE_UNUSED,
895 tree funtype ATTRIBUTE_UNUSED,
896 int size ATTRIBUTE_UNUSED)
902 default_branch_target_register_class (void)
914 default_register_priority (int hard_regno ATTRIBUTE_UNUSED)
920 default_register_usage_leveling_p (void)
926 default_different_addr_displacement_p (void)
932 default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
933 reg_class_t reload_class_i ATTRIBUTE_UNUSED,
934 machine_mode reload_mode ATTRIBUTE_UNUSED,
935 secondary_reload_info *sri)
937 enum reg_class rclass = NO_REGS;
938 enum reg_class reload_class = (enum reg_class) reload_class_i;
940 if (sri->prev_sri && sri->prev_sri->t_icode != CODE_FOR_nothing)
942 sri->icode = sri->prev_sri->t_icode;
945 #ifdef SECONDARY_INPUT_RELOAD_CLASS
947 rclass = SECONDARY_INPUT_RELOAD_CLASS (reload_class, reload_mode, x);
949 #ifdef SECONDARY_OUTPUT_RELOAD_CLASS
951 rclass = SECONDARY_OUTPUT_RELOAD_CLASS (reload_class, reload_mode, x);
953 if (rclass != NO_REGS)
956 = direct_optab_handler (in_p ? reload_in_optab : reload_out_optab,
959 if (icode != CODE_FOR_nothing
960 && !insn_operand_matches (icode, in_p, x))
961 icode = CODE_FOR_nothing;
962 else if (icode != CODE_FOR_nothing)
964 const char *insn_constraint, *scratch_constraint;
965 enum reg_class insn_class, scratch_class;
967 gcc_assert (insn_data[(int) icode].n_operands == 3);
968 insn_constraint = insn_data[(int) icode].operand[!in_p].constraint;
969 if (!*insn_constraint)
970 insn_class = ALL_REGS;
975 gcc_assert (*insn_constraint == '=');
978 insn_class = (reg_class_for_constraint
979 (lookup_constraint (insn_constraint)));
980 gcc_assert (insn_class != NO_REGS);
983 scratch_constraint = insn_data[(int) icode].operand[2].constraint;
984 /* The scratch register's constraint must start with "=&",
985 except for an input reload, where only "=" is necessary,
986 and where it might be beneficial to re-use registers from
988 gcc_assert (scratch_constraint[0] == '='
989 && (in_p || scratch_constraint[1] == '&'));
990 scratch_constraint++;
991 if (*scratch_constraint == '&')
992 scratch_constraint++;
993 scratch_class = (reg_class_for_constraint
994 (lookup_constraint (scratch_constraint)));
996 if (reg_class_subset_p (reload_class, insn_class))
998 gcc_assert (scratch_class == rclass);
1002 rclass = insn_class;
1005 if (rclass == NO_REGS)
1008 sri->t_icode = icode;
1013 /* By default, if flag_pic is true, then neither local nor global relocs
1014 should be placed in readonly memory. */
1017 default_reloc_rw_mask (void)
1019 return flag_pic ? 3 : 0;
1022 /* By default, do no modification. */
1023 tree default_mangle_decl_assembler_name (tree decl ATTRIBUTE_UNUSED,
1029 /* Default to natural alignment for vector types. */
1031 default_vector_alignment (const_tree type)
1033 return tree_to_shwi (TYPE_SIZE (type));
1037 default_builtin_vector_alignment_reachable (const_tree type, bool is_packed)
1042 /* Assuming that types whose size is > pointer-size are not guaranteed to be
1043 naturally aligned. */
1044 if (tree_int_cst_compare (TYPE_SIZE (type), bitsize_int (POINTER_SIZE)) > 0)
1047 /* Assuming that types whose size is <= pointer-size
1048 are naturally aligned. */
1052 /* By default, assume that a target supports any factor of misalignment
1053 memory access if it supports movmisalign patten.
1054 is_packed is true if the memory access is defined in a packed struct. */
1056 default_builtin_support_vector_misalignment (machine_mode mode,
1064 if (optab_handler (movmisalign_optab, mode) != CODE_FOR_nothing)
1069 /* By default, only attempt to parallelize bitwise operations, and
1070 possibly adds/subtracts using bit-twiddling. */
1073 default_preferred_simd_mode (machine_mode mode ATTRIBUTE_UNUSED)
1078 /* By default only the size derived from the preferred vector mode
1082 default_autovectorize_vector_sizes (void)
1087 /* By default, the cost model accumulates three separate costs (prologue,
1088 loop body, and epilogue) for a vectorized loop or block. So allocate an
1089 array of three unsigned ints, set it to zero, and return its address. */
1092 default_init_cost (struct loop *loop_info ATTRIBUTE_UNUSED)
1094 unsigned *cost = XNEWVEC (unsigned, 3);
1095 cost[vect_prologue] = cost[vect_body] = cost[vect_epilogue] = 0;
1099 /* By default, the cost model looks up the cost of the given statement
1100 kind and mode, multiplies it by the occurrence count, accumulates
1101 it into the cost specified by WHERE, and returns the cost added. */
1104 default_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
1105 struct _stmt_vec_info *stmt_info, int misalign,
1106 enum vect_cost_model_location where)
1108 unsigned *cost = (unsigned *) data;
1109 unsigned retval = 0;
1111 tree vectype = stmt_info ? stmt_vectype (stmt_info) : NULL_TREE;
1112 int stmt_cost = targetm.vectorize.builtin_vectorization_cost (kind, vectype,
1114 /* Statements in an inner loop relative to the loop being
1115 vectorized are weighted more heavily. The value here is
1116 arbitrary and could potentially be improved with analysis. */
1117 if (where == vect_body && stmt_info && stmt_in_inner_loop_p (stmt_info))
1118 count *= 50; /* FIXME. */
1120 retval = (unsigned) (count * stmt_cost);
1121 cost[where] += retval;
1126 /* By default, the cost model just returns the accumulated costs. */
1129 default_finish_cost (void *data, unsigned *prologue_cost,
1130 unsigned *body_cost, unsigned *epilogue_cost)
1132 unsigned *cost = (unsigned *) data;
1133 *prologue_cost = cost[vect_prologue];
1134 *body_cost = cost[vect_body];
1135 *epilogue_cost = cost[vect_epilogue];
1138 /* Free the cost data. */
1141 default_destroy_cost_data (void *data)
1146 /* Determine whether or not a pointer mode is valid. Assume defaults
1147 of ptr_mode or Pmode - can be overridden. */
1149 default_valid_pointer_mode (machine_mode mode)
1151 return (mode == ptr_mode || mode == Pmode);
1154 /* Determine whether the memory reference specified by REF may alias
1155 the C libraries errno location. */
1157 default_ref_may_alias_errno (ao_ref *ref)
1159 tree base = ao_ref_base (ref);
1160 /* The default implementation assumes the errno location is
1161 a declaration of type int or is always accessed via a
1162 pointer to int. We assume that accesses to errno are
1163 not deliberately obfuscated (even in conforming ways). */
1164 if (TYPE_UNSIGNED (TREE_TYPE (base))
1165 || TYPE_MODE (TREE_TYPE (base)) != TYPE_MODE (integer_type_node))
1167 /* The default implementation assumes an errno location
1168 declaration is never defined in the current compilation unit. */
1170 && !TREE_STATIC (base))
1172 else if (TREE_CODE (base) == MEM_REF
1173 && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME)
1175 struct ptr_info_def *pi = SSA_NAME_PTR_INFO (TREE_OPERAND (base, 0));
1176 return !pi || pi->pt.anything || pi->pt.nonlocal;
1181 /* Return the mode for a pointer to a given ADDRSPACE, defaulting to ptr_mode
1182 for the generic address space only. */
1185 default_addr_space_pointer_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1187 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace));
1191 /* Return the mode for an address in a given ADDRSPACE, defaulting to Pmode
1192 for the generic address space only. */
1195 default_addr_space_address_mode (addr_space_t addrspace ATTRIBUTE_UNUSED)
1197 gcc_assert (ADDR_SPACE_GENERIC_P (addrspace));
1201 /* Named address space version of valid_pointer_mode. */
1204 default_addr_space_valid_pointer_mode (machine_mode mode, addr_space_t as)
1206 if (!ADDR_SPACE_GENERIC_P (as))
1207 return (mode == targetm.addr_space.pointer_mode (as)
1208 || mode == targetm.addr_space.address_mode (as));
1210 return targetm.valid_pointer_mode (mode);
1213 /* Some places still assume that all pointer or address modes are the
1214 standard Pmode and ptr_mode. These optimizations become invalid if
1215 the target actually supports multiple different modes. For now,
1216 we disable such optimizations on such targets, using this function. */
1219 target_default_pointer_address_modes_p (void)
1221 if (targetm.addr_space.address_mode != default_addr_space_address_mode)
1223 if (targetm.addr_space.pointer_mode != default_addr_space_pointer_mode)
1229 /* Named address space version of legitimate_address_p. */
1232 default_addr_space_legitimate_address_p (machine_mode mode, rtx mem,
1233 bool strict, addr_space_t as)
1235 if (!ADDR_SPACE_GENERIC_P (as))
1238 return targetm.legitimate_address_p (mode, mem, strict);
1241 /* Named address space version of LEGITIMIZE_ADDRESS. */
1244 default_addr_space_legitimize_address (rtx x, rtx oldx,
1245 machine_mode mode, addr_space_t as)
1247 if (!ADDR_SPACE_GENERIC_P (as))
1250 return targetm.legitimize_address (x, oldx, mode);
1253 /* The default hook for determining if one named address space is a subset of
1254 another and to return which address space to use as the common address
1258 default_addr_space_subset_p (addr_space_t subset, addr_space_t superset)
1260 return (subset == superset);
1263 /* The default hook for TARGET_ADDR_SPACE_CONVERT. This hook should never be
1264 called for targets with only a generic address space. */
1267 default_addr_space_convert (rtx op ATTRIBUTE_UNUSED,
1268 tree from_type ATTRIBUTE_UNUSED,
1269 tree to_type ATTRIBUTE_UNUSED)
1275 default_hard_regno_scratch_ok (unsigned int regno ATTRIBUTE_UNUSED)
1280 /* The default implementation of TARGET_MODE_DEPENDENT_ADDRESS_P. */
1283 default_mode_dependent_address_p (const_rtx addr ATTRIBUTE_UNUSED,
1284 addr_space_t addrspace ATTRIBUTE_UNUSED)
1290 default_target_option_valid_attribute_p (tree ARG_UNUSED (fndecl),
1291 tree ARG_UNUSED (name),
1292 tree ARG_UNUSED (args),
1293 int ARG_UNUSED (flags))
1295 warning (OPT_Wattributes,
1296 "target attribute is not supported on this machine");
1302 default_target_option_pragma_parse (tree ARG_UNUSED (args),
1303 tree ARG_UNUSED (pop_target))
1305 warning (OPT_Wpragmas,
1306 "#pragma GCC target is not supported for this machine");
1312 default_target_can_inline_p (tree caller, tree callee)
1315 tree callee_opts = DECL_FUNCTION_SPECIFIC_TARGET (callee);
1316 tree caller_opts = DECL_FUNCTION_SPECIFIC_TARGET (caller);
1318 /* If callee has no option attributes, then it is ok to inline */
1322 /* If caller has no option attributes, but callee does then it is not ok to
1324 else if (!caller_opts)
1327 /* If both caller and callee have attributes, assume that if the
1328 pointer is different, the two functions have different target
1329 options since build_target_option_node uses a hash table for the
1332 ret = (callee_opts == caller_opts);
1338 # define HAVE_casesi 0
1341 /* If the machine does not have a case insn that compares the bounds,
1342 this means extra overhead for dispatch tables, which raises the
1343 threshold for using them. */
1346 default_case_values_threshold (void)
1348 return (HAVE_casesi ? 4 : 5);
1352 default_have_conditional_execution (void)
1354 #ifdef HAVE_conditional_execution
1355 return HAVE_conditional_execution;
1361 /* By default we assume that c99 functions are present at the runtime,
1362 but sincos is not. */
1364 default_libc_has_function (enum function_class fn_class)
1366 if (fn_class == function_c94
1367 || fn_class == function_c99_misc
1368 || fn_class == function_c99_math_complex)
1375 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1381 no_c99_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
1387 default_builtin_tm_load_store (tree ARG_UNUSED (type))
1392 /* Compute cost of moving registers to/from memory. */
1395 default_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1396 reg_class_t rclass ATTRIBUTE_UNUSED,
1397 bool in ATTRIBUTE_UNUSED)
1399 #ifndef MEMORY_MOVE_COST
1400 return (4 + memory_move_secondary_cost (mode, (enum reg_class) rclass, in));
1402 return MEMORY_MOVE_COST (mode, (enum reg_class) rclass, in);
1406 /* Compute cost of moving data from a register of class FROM to one of
1410 default_register_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
1411 reg_class_t from ATTRIBUTE_UNUSED,
1412 reg_class_t to ATTRIBUTE_UNUSED)
1414 #ifndef REGISTER_MOVE_COST
1417 return REGISTER_MOVE_COST (mode, (enum reg_class) from, (enum reg_class) to);
1421 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default
1422 behaviour. SPEED_P is true if we are compiling for speed. */
1425 get_move_ratio (bool speed_p ATTRIBUTE_UNUSED)
1427 unsigned int move_ratio;
1429 move_ratio = (unsigned int) MOVE_RATIO (speed_p);
1431 #if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
1433 #else /* No movmem patterns, pick a default. */
1434 move_ratio = ((speed_p) ? 15 : 3);
1440 /* Return TRUE if the move_by_pieces/set_by_pieces infrastructure should be
1441 used; return FALSE if the movmem/setmem optab should be expanded, or
1442 a call to memcpy emitted. */
1445 default_use_by_pieces_infrastructure_p (unsigned HOST_WIDE_INT size,
1446 unsigned int alignment,
1447 enum by_pieces_operation op,
1450 unsigned int max_size = 0;
1451 unsigned int ratio = 0;
1455 case CLEAR_BY_PIECES:
1456 max_size = STORE_MAX_PIECES;
1457 ratio = CLEAR_RATIO (speed_p);
1459 case MOVE_BY_PIECES:
1460 max_size = MOVE_MAX_PIECES;
1461 ratio = get_move_ratio (speed_p);
1464 max_size = STORE_MAX_PIECES;
1465 ratio = SET_RATIO (speed_p);
1467 case STORE_BY_PIECES:
1468 max_size = STORE_MAX_PIECES;
1469 ratio = get_move_ratio (speed_p);
1473 return move_by_pieces_ninsns (size, alignment, max_size + 1) < ratio;
1477 default_profile_before_prologue (void)
1479 #ifdef PROFILE_BEFORE_PROLOGUE
1486 /* The default implementation of TARGET_PREFERRED_RELOAD_CLASS. */
1489 default_preferred_reload_class (rtx x ATTRIBUTE_UNUSED,
1492 #ifdef PREFERRED_RELOAD_CLASS
1493 return (reg_class_t) PREFERRED_RELOAD_CLASS (x, (enum reg_class) rclass);
1499 /* The default implementation of TARGET_OUTPUT_PREFERRED_RELOAD_CLASS. */
1502 default_preferred_output_reload_class (rtx x ATTRIBUTE_UNUSED,
1508 /* The default implementation of TARGET_PREFERRED_RENAME_CLASS. */
1510 default_preferred_rename_class (reg_class_t rclass ATTRIBUTE_UNUSED)
1515 /* The default implementation of TARGET_CLASS_LIKELY_SPILLED_P. */
1518 default_class_likely_spilled_p (reg_class_t rclass)
1520 return (reg_class_size[(int) rclass] == 1);
1523 /* The default implementation of TARGET_CLASS_MAX_NREGS. */
1526 default_class_max_nregs (reg_class_t rclass ATTRIBUTE_UNUSED,
1527 machine_mode mode ATTRIBUTE_UNUSED)
1529 #ifdef CLASS_MAX_NREGS
1530 return (unsigned char) CLASS_MAX_NREGS ((enum reg_class) rclass, mode);
1532 return ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1) / UNITS_PER_WORD);
1536 /* Determine the debugging unwind mechanism for the target. */
1538 enum unwind_info_type
1539 default_debug_unwind_info (void)
1541 /* If the target wants to force the use of dwarf2 unwind info, let it. */
1542 /* ??? Change all users to the hook, then poison this. */
1543 #ifdef DWARF2_FRAME_INFO
1544 if (DWARF2_FRAME_INFO)
1548 /* Otherwise, only turn it on if dwarf2 debugging is enabled. */
1549 #ifdef DWARF2_DEBUGGING_INFO
1550 if (write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1557 /* Determine the correct mode for a Dwarf frame register that represents
1561 default_dwarf_frame_reg_mode (int regno)
1563 machine_mode save_mode = reg_raw_mode[regno];
1565 if (HARD_REGNO_CALL_PART_CLOBBERED (regno, save_mode))
1566 save_mode = choose_hard_reg_mode (regno, 1, true);
1570 /* To be used by targets where reg_raw_mode doesn't return the right
1571 mode for registers used in apply_builtin_return and apply_builtin_arg. */
1574 default_get_reg_raw_mode (int regno)
1576 return reg_raw_mode[regno];
1579 /* Return true if a leaf function should stay leaf even with profiling
1583 default_keep_leaf_when_profiled ()
1588 /* Return true if the state of option OPTION should be stored in PCH files
1589 and checked by default_pch_valid_p. Store the option's current state
1593 option_affects_pch_p (int option, struct cl_option_state *state)
1595 if ((cl_options[option].flags & CL_TARGET) == 0)
1597 if ((cl_options[option].flags & CL_PCH_IGNORE) != 0)
1599 if (option_flag_var (option, &global_options) == &target_flags)
1600 if (targetm.check_pch_target_flags)
1602 return get_option_state (&global_options, option, state);
1605 /* Default version of get_pch_validity.
1606 By default, every flag difference is fatal; that will be mostly right for
1607 most targets, but completely right for very few. */
1610 default_get_pch_validity (size_t *sz)
1612 struct cl_option_state state;
1617 if (targetm.check_pch_target_flags)
1618 *sz += sizeof (target_flags);
1619 for (i = 0; i < cl_options_count; i++)
1620 if (option_affects_pch_p (i, &state))
1623 result = r = XNEWVEC (char, *sz);
1627 if (targetm.check_pch_target_flags)
1629 memcpy (r, &target_flags, sizeof (target_flags));
1630 r += sizeof (target_flags);
1633 for (i = 0; i < cl_options_count; i++)
1634 if (option_affects_pch_p (i, &state))
1636 memcpy (r, state.data, state.size);
1643 /* Return a message which says that a PCH file was created with a different
1644 setting of OPTION. */
1647 pch_option_mismatch (const char *option)
1649 return xasprintf (_("created and used with differing settings of '%s'"),
1653 /* Default version of pch_valid_p. */
1656 default_pch_valid_p (const void *data_p, size_t len)
1658 struct cl_option_state state;
1659 const char *data = (const char *)data_p;
1662 /* -fpic and -fpie also usually make a PCH invalid. */
1663 if (data[0] != flag_pic)
1664 return _("created and used with different settings of -fpic");
1665 if (data[1] != flag_pie)
1666 return _("created and used with different settings of -fpie");
1669 /* Check target_flags. */
1670 if (targetm.check_pch_target_flags)
1675 memcpy (&tf, data, sizeof (target_flags));
1676 data += sizeof (target_flags);
1677 len -= sizeof (target_flags);
1678 r = targetm.check_pch_target_flags (tf);
1683 for (i = 0; i < cl_options_count; i++)
1684 if (option_affects_pch_p (i, &state))
1686 if (memcmp (data, state.data, state.size) != 0)
1687 return pch_option_mismatch (cl_options[i].opt_text);
1695 /* Default version of cstore_mode. */
1698 default_cstore_mode (enum insn_code icode)
1700 return insn_data[(int) icode].operand[0].mode;
1703 /* Default version of member_type_forces_blk. */
1706 default_member_type_forces_blk (const_tree, machine_mode)
1712 default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED,
1713 rtx ptr ATTRIBUTE_UNUSED,
1714 rtx bnd ATTRIBUTE_UNUSED)
1720 default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED,
1721 rtx addr ATTRIBUTE_UNUSED,
1722 rtx bounds ATTRIBUTE_UNUSED,
1723 rtx to ATTRIBUTE_UNUSED)
1729 default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED)
1735 default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED,
1736 rtx bounds ATTRIBUTE_UNUSED)
1741 /* Default version of canonicalize_comparison. */
1744 default_canonicalize_comparison (int *, rtx *, rtx *, bool)
1748 /* Default implementation of TARGET_ATOMIC_ASSIGN_EXPAND_FENV. */
1751 default_atomic_assign_expand_fenv (tree *, tree *, tree *)
1755 #ifndef PAD_VARARGS_DOWN
1756 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
1759 /* Build an indirect-ref expression over the given TREE, which represents a
1760 piece of a va_arg() expansion. */
1762 build_va_arg_indirect_ref (tree addr)
1764 addr = build_simple_mem_ref_loc (EXPR_LOCATION (addr), addr);
1768 /* The "standard" implementation of va_arg: read the value from the
1769 current (padded) address and increment by the (padded) size. */
1772 std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
1775 tree addr, t, type_size, rounded_size, valist_tmp;
1776 unsigned HOST_WIDE_INT align, boundary;
1779 #ifdef ARGS_GROW_DOWNWARD
1780 /* All of the alignment and movement below is for args-grow-up machines.
1781 As of 2004, there are only 3 ARGS_GROW_DOWNWARD targets, and they all
1782 implement their own specialized gimplify_va_arg_expr routines. */
1786 indirect = pass_by_reference (NULL, TYPE_MODE (type), type, false);
1788 type = build_pointer_type (type);
1790 align = PARM_BOUNDARY / BITS_PER_UNIT;
1791 boundary = targetm.calls.function_arg_boundary (TYPE_MODE (type), type);
1793 /* When we align parameter on stack for caller, if the parameter
1794 alignment is beyond MAX_SUPPORTED_STACK_ALIGNMENT, it will be
1795 aligned at MAX_SUPPORTED_STACK_ALIGNMENT. We will match callee
1796 here with caller. */
1797 if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT)
1798 boundary = MAX_SUPPORTED_STACK_ALIGNMENT;
1800 boundary /= BITS_PER_UNIT;
1802 /* Hoist the valist value into a temporary for the moment. */
1803 valist_tmp = get_initialized_tmp_var (valist, pre_p, NULL);
1805 /* va_list pointer is aligned to PARM_BOUNDARY. If argument actually
1806 requires greater alignment, we must perform dynamic alignment. */
1807 if (boundary > align
1808 && !integer_zerop (TYPE_SIZE (type)))
1810 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
1811 fold_build_pointer_plus_hwi (valist_tmp, boundary - 1));
1812 gimplify_and_add (t, pre_p);
1814 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist_tmp,
1815 fold_build2 (BIT_AND_EXPR, TREE_TYPE (valist),
1817 build_int_cst (TREE_TYPE (valist), -boundary)));
1818 gimplify_and_add (t, pre_p);
1823 /* If the actual alignment is less than the alignment of the type,
1824 adjust the type accordingly so that we don't assume strict alignment
1825 when dereferencing the pointer. */
1826 boundary *= BITS_PER_UNIT;
1827 if (boundary < TYPE_ALIGN (type))
1829 type = build_variant_type_copy (type);
1830 TYPE_ALIGN (type) = boundary;
1833 /* Compute the rounded size of the type. */
1834 type_size = size_in_bytes (type);
1835 rounded_size = round_up (type_size, align);
1837 /* Reduce rounded_size so it's sharable with the postqueue. */
1838 gimplify_expr (&rounded_size, pre_p, post_p, is_gimple_val, fb_rvalue);
1842 if (PAD_VARARGS_DOWN && !integer_zerop (rounded_size))
1844 /* Small args are padded downward. */
1845 t = fold_build2_loc (input_location, GT_EXPR, sizetype,
1846 rounded_size, size_int (align));
1847 t = fold_build3 (COND_EXPR, sizetype, t, size_zero_node,
1848 size_binop (MINUS_EXPR, rounded_size, type_size));
1849 addr = fold_build_pointer_plus (addr, t);
1852 /* Compute new value for AP. */
1853 t = fold_build_pointer_plus (valist_tmp, rounded_size);
1854 t = build2 (MODIFY_EXPR, TREE_TYPE (valist), valist, t);
1855 gimplify_and_add (t, pre_p);
1857 addr = fold_convert (build_pointer_type (type), addr);
1860 addr = build_va_arg_indirect_ref (addr);
1862 return build_va_arg_indirect_ref (addr);
1866 default_chkp_bound_type (void)
1868 tree res = make_node (POINTER_BOUNDS_TYPE);
1869 TYPE_PRECISION (res) = TYPE_PRECISION (size_type_node) * 2;
1870 TYPE_NAME (res) = get_identifier ("__bounds_type");
1871 SET_TYPE_MODE (res, targetm.chkp_bound_mode ());
1877 default_chkp_bound_mode (void)
1883 default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED)
1889 default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED,
1890 const_tree fn_decl_or_type ATTRIBUTE_UNUSED,
1891 bool outgoing ATTRIBUTE_UNUSED)
1897 default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED,
1898 HOST_WIDE_INT ub ATTRIBUTE_UNUSED)
1904 default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED,
1905 tree lb ATTRIBUTE_UNUSED,
1906 tree ub ATTRIBUTE_UNUSED,
1907 tree *stmts ATTRIBUTE_UNUSED)
1913 default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED,
1914 enum machine_mode mode ATTRIBUTE_UNUSED,
1915 tree type ATTRIBUTE_UNUSED,
1916 int *pretend_arg_size ATTRIBUTE_UNUSED,
1917 int second_time ATTRIBUTE_UNUSED)
1921 /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
1922 not support nested low-overhead loops. */
1925 can_use_doloop_if_innermost (const widest_int &, const widest_int &,
1926 unsigned int loop_depth, bool)
1928 return loop_depth == 1;
1931 #include "gt-targhooks.h"