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Annotation of gcc/config/m68k/m68kemb.h, revision 1.1

1.1     ! root        1: /* Definitions of target machine for GNU compiler.  "embedded" 68XXX.
        !             2:    This is meant to be included after m68k.h.
        !             3:    Copyright (C) 1994, 1995 Free Software Foundation, Inc.  */
        !             4: 
        !             5: #define PTRDIFF_TYPE "long int"
        !             6: #define SIZE_TYPE "long unsigned int"
        !             7: 
        !             8: /* In order for bitfields to work on a 68000, or with -mnobitfield, we must
        !             9:    define either PCC_BITFIELD_TYPE_MATTERS or STRUCTURE_SIZE_BOUNDARY.
        !            10:    Defining STRUCTURE_SIZE_BOUNDARY results in structure packing problems,
        !            11:    so we define PCC_BITFIELD_TYPE_MATTERS.  */
        !            12: #define PCC_BITFIELD_TYPE_MATTERS 1
        !            13: 
        !            14: /* Undef PCC_STATIC_STRUCT_RETURN so that we get a re-entrant calling
        !            15:    convention.  */
        !            16: #undef PCC_STATIC_STRUCT_RETURN
        !            17: 
        !            18: /* Don't default to pcc-struct-return, so that we can return small structures
        !            19:    and unions in registers, which is slightly more efficient.  */
        !            20: #define DEFAULT_PCC_STRUCT_RETURN 0
        !            21: 
        !            22: /* Return floating point values in a fp register.  This make fp code a
        !            23:    little bit faster.  It also makes -msoft-float code incompatible with
        !            24:    -m68881 code, so people have to be careful not to mix the two.  */
        !            25: #undef FUNCTION_VALUE
        !            26: #define FUNCTION_VALUE(VALTYPE,FUNC) LIBCALL_VALUE (TYPE_MODE (VALTYPE))
        !            27: 
        !            28: #undef LIBCALL_VALUE
        !            29: #define LIBCALL_VALUE(MODE)                                                \
        !            30:  gen_rtx (REG, (MODE),                                                     \
        !            31:           ((TARGET_68881                                                   \
        !            32:             && ((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode)) \
        !            33:            ? 16 : 0))
        !            34: 
        !            35: #undef FUNCTION_VALUE_REGNO_P
        !            36: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (TARGET_68881 && (N) == 16))
        !            37: 
        !            38: #undef NEEDS_UNTYPED_CALL
        !            39: #define NEEDS_UNTYPED_CALL 1
        !            40: 
        !            41: /* crt0.o should be specified in the linker script.  */
        !            42: #undef STARTFILE_SPEC
        !            43: #define STARTFILE_SPEC ""

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