/* 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);