42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
/* Copyright (C) 1991, 1992, 1995, 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. */
|
|
|
|
#include <math.h>
|
|
#include "ieee754.h"
|
|
|
|
#undef __isnanl
|
|
#undef isnanl
|
|
|
|
|
|
/* Return nonzero if VALUE is not a number. */
|
|
int
|
|
__isnanl (long double value)
|
|
{
|
|
union ieee854_long_double u;
|
|
|
|
u.d = value;
|
|
|
|
/* IEEE 854 NaN's have the maximum possible
|
|
exponent and a nonzero mantissa. In Motorola's
|
|
interpretation the integer bit is ignored. */
|
|
return ((u.ieee.exponent & 0x7fff) == 0x7fff &&
|
|
((u.ieee.mantissa0 & 0x7fffffff) != 0 || u.ieee.mantissa1 != 0));
|
|
}
|
|
|
|
weak_alias (__isnanl, isnanl);
|