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Annotation of gcc/config/m68k/m68kemb.h, revision 1.1.1.1

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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