423 lines
15 KiB
C
423 lines
15 KiB
C
/* Target definitions for PowerPC running Darwin (Mac OS X).
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Copyright (C) 1997-2017 Free Software Foundation, Inc.
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Contributed by Apple Computer Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3, or (at your
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option) any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#undef DARWIN_PPC
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#define DARWIN_PPC 1
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/* The "Darwin ABI" is mostly like AIX, but with some key differences. */
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#define DEFAULT_ABI ABI_DARWIN
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#ifdef IN_LIBGCC2
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#undef TARGET_64BIT
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#ifdef __powerpc64__
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#define TARGET_64BIT 1
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#else
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#define TARGET_64BIT 0
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#endif
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#endif
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/* The object file format is Mach-O. */
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#define TARGET_OBJECT_FORMAT OBJECT_MACHO
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/* Size of the Obj-C jump buffer. */
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#define OBJC_JBLEN ((TARGET_64BIT) ? (26*2 + 18*2 + 129 + 1) : (26 + 18*2 + 129 + 1))
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/* We're not ever going to do TOCs. */
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#define TARGET_TOC 0
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#define TARGET_NO_TOC 1
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/* Override the default rs6000 definition. */
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#undef PTRDIFF_TYPE
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#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
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#define TARGET_OS_CPP_BUILTINS() \
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do \
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{ \
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if (!TARGET_64BIT) builtin_define ("__ppc__"); \
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if (TARGET_64BIT) builtin_define ("__ppc64__"); \
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builtin_define ("__POWERPC__"); \
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builtin_define ("__NATURAL_ALIGNMENT__"); \
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darwin_cpp_builtins (pfile); \
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} \
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while (0)
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/* Generate branch islands stubs if this is true. */
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extern int darwin_emit_branch_islands;
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#define SUBTARGET_OVERRIDE_OPTIONS darwin_rs6000_override_options ()
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#define C_COMMON_OVERRIDE_OPTIONS do { \
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/* On powerpc, __cxa_get_exception_ptr is available starting in the \
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10.4.6 libstdc++.dylib. */ \
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if (strverscmp (darwin_macosx_version_min, "10.4.6") < 0 \
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&& flag_use_cxa_get_exception_ptr == 2) \
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flag_use_cxa_get_exception_ptr = 0; \
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if (flag_mkernel) \
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flag_no_builtin = 1; \
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SUBTARGET_C_COMMON_OVERRIDE_OPTIONS; \
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} while (0)
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/* Darwin has 128-bit long double support in libc in 10.4 and later.
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Default to 128-bit long doubles even on earlier platforms for ABI
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consistency; arithmetic will work even if libc and libm support is
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not available. */
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#define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
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/* We want -fPIC by default, unless we're using -static to compile for
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the kernel or some such. The "-faltivec" option should have been
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called "-maltivec" all along. */
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#define CC1_SPEC "\
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%(cc1_cpu) \
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%{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }} \
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%{static: %{Zdynamic: %e conflicting code gen style switches are used}}\
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%{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
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%{faltivec:-maltivec -include altivec.h} %{fno-altivec:-mno-altivec} \
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%<faltivec %<fno-altivec " \
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DARWIN_CC1_SPEC
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#define DARWIN_ARCH_SPEC "%{m64:ppc64;:ppc}"
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#define DARWIN_SUBARCH_SPEC " \
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%{m64: ppc64} \
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%{!m64: \
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%{mcpu=601:ppc601; \
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mcpu=603:ppc603; \
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mcpu=603e:ppc603; \
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mcpu=604:ppc604; \
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mcpu=604e:ppc604e; \
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mcpu=740:ppc750; \
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mcpu=750:ppc750; \
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mcpu=G3:ppc750; \
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mcpu=7400:ppc7400; \
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mcpu=G4:ppc7400; \
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mcpu=7450:ppc7450; \
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mcpu=970:ppc970; \
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mcpu=power4:ppc970; \
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mcpu=G5:ppc970; \
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:ppc}}"
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/* crt2.o is at least partially required for 10.3.x and earlier. */
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#define DARWIN_CRT2_SPEC \
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"%{!m64:%:version-compare(!> 10.4 mmacosx-version-min= crt2.o%s)}"
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#undef SUBTARGET_EXTRA_SPECS
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#define SUBTARGET_EXTRA_SPECS \
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DARWIN_EXTRA_SPECS \
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{ "darwin_arch", DARWIN_ARCH_SPEC }, \
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{ "darwin_crt2", DARWIN_CRT2_SPEC }, \
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{ "darwin_subarch", DARWIN_SUBARCH_SPEC },
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/* Output a .machine directive. */
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#undef TARGET_ASM_FILE_START
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#define TARGET_ASM_FILE_START rs6000_darwin_file_start
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/* Make both r2 and r13 available for allocation. */
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#define FIXED_R2 0
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#define FIXED_R13 0
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/* Base register for access to local variables of the function. */
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#undef HARD_FRAME_POINTER_REGNUM
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#define HARD_FRAME_POINTER_REGNUM 30
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#undef RS6000_PIC_OFFSET_TABLE_REGNUM
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#define RS6000_PIC_OFFSET_TABLE_REGNUM 31
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/* Pad the outgoing args area to 16 bytes instead of the usual 8. */
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#undef STARTING_FRAME_OFFSET
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#define STARTING_FRAME_OFFSET \
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(FRAME_GROWS_DOWNWARD \
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? 0 \
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: (RS6000_ALIGN (crtl->outgoing_args_size, 16) \
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+ RS6000_SAVE_AREA))
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#undef STACK_DYNAMIC_OFFSET
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#define STACK_DYNAMIC_OFFSET(FUNDECL) \
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(RS6000_ALIGN (crtl->outgoing_args_size, 16) \
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+ (STACK_POINTER_OFFSET))
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/* Darwin uses a function call if everything needs to be saved/restored. */
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#undef WORLD_SAVE_P
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#define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
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/* We don't use these on Darwin, they are just place-holders. */
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#define SAVE_FP_PREFIX ""
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#define SAVE_FP_SUFFIX ""
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#define RESTORE_FP_PREFIX ""
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#define RESTORE_FP_SUFFIX ""
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/* The assembler wants the alternate register names, but without
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leading percent sign. */
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#undef REGISTER_NAMES
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#define REGISTER_NAMES \
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{ \
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"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \
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"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", \
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"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
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"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", \
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
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"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
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"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
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"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
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"mq", "lr", "ctr", "ap", \
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"cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", \
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"xer", \
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"v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", \
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"v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15", \
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"v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", \
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"v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31", \
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"vrsave", "vscr", \
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"spe_acc", "spefscr", \
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"sfp", \
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"tfhar", "tfiar", "texasr", \
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"rh0", "rh1", "rh2", "rh3", "rh4", "rh5", "rh6", "rh7", \
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"rh8", "rh9", "rh10", "rh11", "rh12", "rh13", "rh14", "rh15", \
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"rh16", "rh17", "rh18", "rh19", "rh20", "rh21", "rh22", "rh23", \
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"rh24", "rh25", "rh26", "rh27", "rh28", "rh29", "rh30", "rh31" \
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}
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/* This outputs NAME to FILE. */
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#undef RS6000_OUTPUT_BASENAME
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#define RS6000_OUTPUT_BASENAME(FILE, NAME) \
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assemble_name (FILE, NAME)
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/* Globalizing directive for a label. */
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#undef GLOBAL_ASM_OP
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#define GLOBAL_ASM_OP "\t.globl "
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#undef TARGET_ASM_GLOBALIZE_LABEL
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/* This is how to output an internal label prefix. rs6000.c uses this
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when generating traceback tables. */
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/* Not really used for Darwin? */
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#undef ASM_OUTPUT_INTERNAL_LABEL_PREFIX
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#define ASM_OUTPUT_INTERNAL_LABEL_PREFIX(FILE,PREFIX) \
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fprintf (FILE, "%s", PREFIX)
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/* Override the standard rs6000 definition. */
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#undef ASM_COMMENT_START
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#define ASM_COMMENT_START ";"
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/* This is how to output an assembler line that says to advance
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the location counter to a multiple of 2**LOG bytes using the
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"nop" instruction as padding. */
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#define ASM_OUTPUT_ALIGN_WITH_NOP(FILE,LOG) \
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do \
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{ \
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if ((LOG) < 3) \
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{ \
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ASM_OUTPUT_ALIGN (FILE,LOG); \
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} \
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else /* nop == ori r0,r0,0 */ \
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fprintf (FILE, "\t.align32 %d,0x60000000\n", (LOG)); \
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} while (0)
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#ifdef HAVE_GAS_MAX_SKIP_P2ALIGN
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/* This is supported in cctools 465 and later. The macro test
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above prevents using it in earlier build environments. */
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#define ASM_OUTPUT_MAX_SKIP_ALIGN(FILE,LOG,MAX_SKIP) \
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if ((LOG) != 0) \
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{ \
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if ((MAX_SKIP) == 0) \
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fprintf ((FILE), "\t.p2align %d\n", (LOG)); \
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else \
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fprintf ((FILE), "\t.p2align %d,,%d\n", (LOG), (MAX_SKIP)); \
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}
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#endif
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/* Generate insns to call the profiler. */
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#define PROFILE_HOOK(LABEL) output_profile_hook (LABEL)
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/* Function name to call to do profiling. */
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#define RS6000_MCOUNT "*mcount"
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/* Default processor: G4, and G5 for 64-bit. */
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#undef PROCESSOR_DEFAULT
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#define PROCESSOR_DEFAULT PROCESSOR_PPC7400
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#undef PROCESSOR_DEFAULT64
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#define PROCESSOR_DEFAULT64 PROCESSOR_POWER4
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/* Default target flag settings. Despite the fact that STMW/LMW
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serializes, it's still a big code size win to use them. Use FSEL by
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default as well. */
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#undef TARGET_DEFAULT
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#define TARGET_DEFAULT (MASK_MULTIPLE | MASK_PPC_GFXOPT)
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/* Darwin always uses IBM long double, never IEEE long double. */
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#undef TARGET_IEEEQUAD
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#define TARGET_IEEEQUAD 0
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/* Since Darwin doesn't do TOCs, stub this out. */
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#define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE) ((void)X, (void)MODE, 0)
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/* Unlike most other PowerPC targets, chars are signed, for
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consistency with other Darwin architectures. */
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#undef DEFAULT_SIGNED_CHAR
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#define DEFAULT_SIGNED_CHAR (1)
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/* Given an rtx X being reloaded into a reg required to be
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in class CLASS, return the class of reg to actually use.
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In general this is just CLASS; but on some machines
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in some cases it is preferable to use a more restrictive class.
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On the RS/6000, we have to return NO_REGS when we want to reload a
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floating-point CONST_DOUBLE to force it to be copied to memory.
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Don't allow R0 when loading the address of, or otherwise furtling with,
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a SYMBOL_REF. */
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#undef PREFERRED_RELOAD_CLASS
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#define PREFERRED_RELOAD_CLASS(X,CLASS) \
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((CONSTANT_P (X) \
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&& reg_classes_intersect_p ((CLASS), FLOAT_REGS)) \
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? NO_REGS \
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: ((GET_CODE (X) == SYMBOL_REF || GET_CODE (X) == HIGH) \
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&& reg_class_subset_p (BASE_REGS, (CLASS))) \
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? BASE_REGS \
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: (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT \
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&& (CLASS) == NON_SPECIAL_REGS) \
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? GENERAL_REGS \
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: (CLASS))
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/* Compute field alignment.
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This implements the 'power' alignment rule by pegging the alignment of
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items (beyond the first aggregate field) to 32 bits. The pegging is
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suppressed for vector and long double items (both 128 in size).
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There is a dummy use of the FIELD argument to avoid an unused variable
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warning (see PR59496). */
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#define ADJUST_FIELD_ALIGN(FIELD, TYPE, COMPUTED) \
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((void) (FIELD), \
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(TARGET_ALIGN_NATURAL \
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? (COMPUTED) \
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: (COMPUTED) == 128 \
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? 128 \
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: MIN ((COMPUTED), 32)))
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/* Darwin increases natural record alignment to doubleword if the first
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field is an FP double while the FP fields remain word aligned. */
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#define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \
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((TREE_CODE (STRUCT) == RECORD_TYPE \
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|| TREE_CODE (STRUCT) == UNION_TYPE \
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|| TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \
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&& TARGET_ALIGN_NATURAL == 0 \
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? darwin_rs6000_special_round_type_align (STRUCT, COMPUTED, SPECIFIED) \
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: (TREE_CODE (STRUCT) == VECTOR_TYPE \
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&& ALTIVEC_VECTOR_MODE (TYPE_MODE (STRUCT))) \
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? MAX (MAX ((COMPUTED), (SPECIFIED)), 128) \
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: MAX ((COMPUTED), (SPECIFIED)))
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/* Specify padding for the last element of a block move between
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registers and memory. FIRST is nonzero if this is the only
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element. */
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#define BLOCK_REG_PADDING(MODE, TYPE, FIRST) \
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(!(FIRST) ? upward : FUNCTION_ARG_PADDING (MODE, TYPE))
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#define DOUBLE_INT_ASM_OP "\t.quad\t"
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/* For binary compatibility with 2.95; Darwin C APIs use bool from
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stdbool.h, which was an int-sized enum in 2.95. Users can explicitly
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choose to have sizeof(bool)==1 with the -mone-byte-bool switch. */
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#define BOOL_TYPE_SIZE (darwin_one_byte_bool ? CHAR_TYPE_SIZE : INT_TYPE_SIZE)
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#undef REGISTER_TARGET_PRAGMAS
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#define REGISTER_TARGET_PRAGMAS() \
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do \
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{ \
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DARWIN_REGISTER_TARGET_PRAGMAS(); \
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targetm.resolve_overloaded_builtin = altivec_resolve_overloaded_builtin; \
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} \
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while (0)
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#ifdef IN_LIBGCC2
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#include <stdbool.h>
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#endif
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/* True, iff we're generating fast turn around debugging code. When
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true, we arrange for function prologues to start with 5 nops so
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that gdb may insert code to redirect them, and for data to be
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accessed indirectly. The runtime uses this indirection to forward
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references for data to the original instance of that data. */
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#define TARGET_FIX_AND_CONTINUE (darwin_fix_and_continue)
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/* This is the reserved direct dispatch address for Objective-C. */
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#define OFFS_MSGSEND_FAST 0xFFFEFF00
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/* This is the reserved ivar address Objective-C. */
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#define OFFS_ASSIGNIVAR_FAST 0xFFFEFEC0
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/* Old versions of Mac OS/Darwin don't have C99 functions available. */
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#undef TARGET_LIBC_HAS_FUNCTION
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#define TARGET_LIBC_HAS_FUNCTION darwin_libc_has_function
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/* When generating kernel code or kexts, we don't use Altivec by
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default, as kernel code doesn't save/restore those registers. */
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#define OS_MISSING_ALTIVEC (flag_mkernel || flag_apple_kext)
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/* Darwin has support for section anchors on powerpc*.
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It is disabled for any section containing a "zero-sized item" (because these
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are re-written as size=1 to be compatible with the OSX ld64).
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The re-writing would interfere with the computation of anchor offsets.
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Therefore, we place zero-sized items in their own sections and make such
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sections unavailable to section anchoring. */
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#undef TARGET_ASM_OUTPUT_ANCHOR
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#define TARGET_ASM_OUTPUT_ANCHOR darwin_asm_output_anchor
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#undef TARGET_USE_ANCHORS_FOR_SYMBOL_P
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#define TARGET_USE_ANCHORS_FOR_SYMBOL_P darwin_use_anchors_for_symbol_p
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#undef DARWIN_SECTION_ANCHORS
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#define DARWIN_SECTION_ANCHORS 1
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/* PPC Darwin has to rename some of the long double builtins. */
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#undef SUBTARGET_INIT_BUILTINS
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#define SUBTARGET_INIT_BUILTINS \
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do { \
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darwin_patch_builtins (); \
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rs6000_builtin_decls[(unsigned) (RS6000_BUILTIN_CFSTRING)] \
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= darwin_init_cfstring_builtins ((unsigned) (RS6000_BUILTIN_CFSTRING)); \
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} while(0)
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/* So far, there is no rs6000_fold_builtin, if one is introduced, then
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this will need to be modified similar to the x86 case. */
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#define TARGET_FOLD_BUILTIN SUBTARGET_FOLD_BUILTIN
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/* Use standard DWARF numbering for DWARF debugging information. */
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#define RS6000_USE_DWARF_NUMBERING
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