| /* `NAN' constant for IEEE 754 machines. |
| 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 |
| modify it under the terms of the GNU Library General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #ifndef _NAN_H |
| |
| #define _NAN_H 1 |
| |
| /* 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 |
| |
| 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 */ |