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Diffstat (limited to 'sysdeps/ieee754/nan.h')
| -rw-r--r-- | sysdeps/ieee754/nan.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/sysdeps/ieee754/nan.h b/sysdeps/ieee754/nan.h new file mode 100644 index 0000000000..e34c172dcb --- /dev/null +++ b/sysdeps/ieee754/nan.h @@ -0,0 +1,46 @@ +/* `NAN' constant for IEEE 754 machines. + +Copyright (C) 1992 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., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#ifndef _NAN_H + +#define _NAN_H 1 + +/* IEEE Not A Number. */ + +#include <endian.h> + +#if __BYTE_ORDER == __BIG_ENDIAN +#define __nan_bytes { 0x7f, 0xf8, 0, 0, 0, 0, 0, 0 } +#endif +#if __BYTE_ORDER == __LITTLE_ENDIAN +#define __nan_bytes { 0, 0, 0, 0, 0, 0, 0xf8, 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) +#endif /* GCC. */ + +#endif /* nan.h */ |