diff options
Diffstat (limited to 'sysdeps/ieee754/nan.h')
| -rw-r--r-- | sysdeps/ieee754/nan.h | 37 |
1 files changed, 28 insertions, 9 deletions
diff --git a/sysdeps/ieee754/nan.h b/sysdeps/ieee754/nan.h index bea98d96d4..d4e6842562 100644 --- a/sysdeps/ieee754/nan.h +++ b/sysdeps/ieee754/nan.h @@ -1,5 +1,5 @@ /* `NAN' constant for IEEE 754 machines. - Copyright (C) 1992, 1996 Free Software Foundation, Inc. + Copyright (C) 1992, 1996, 1997 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -23,23 +23,42 @@ /* IEEE Not A Number. */ +#ifdef __GNUC__ + +#define NAN \ + (__extension__ \ + ((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \ + { __l: 0x7ff8000000000000ULL }).__d) + +#define NANF \ + (__extension__ \ + ((union { unsigned __l __attribute__((__mode__(__SI__))); flaot __d; }) \ + { __l: 0x7fc00000UL }).__d) + +#else + #include <endian.h> #if __BYTE_ORDER == __BIG_ENDIAN #define __nan_bytes { 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 } +#define __nanf_bytes { 0x7f, 0xc0, 0, 0 } #endif #if __BYTE_ORDER == __LITTLE_ENDIAN #define __nan_bytes { 0, 0, 0, 0, 0, 0, 0xf8, 0x7f } +#define __nanf_bytes { 0, 0, 0xc0, 0x7f } #endif -#ifdef __GNUC__ -#define NAN \ - (__extension__ ((union { unsigned char __c[8]; \ - double __d; }) \ - { __nan_bytes }).__d) -#else /* Not GCC. */ -static CONST char __nan[8] = __nan_bytes; -#define NAN (*(CONST double *) __nan) +static union { unsigned char __c[8]; double __d; } __nan = { __nan_bytes }; +#define NAN (__nan.__d) + +static union { unsigned char __c[4]; double __d; } __nanf = { __nanf_bytes }; +#define NANF (__nanf.__d) + #endif /* GCC. */ +/* Generally there is no separate `long double' format and it is the + same as `double'. */ + +#define NANL NAN + #endif /* nan.h */ |