Update.
[glibc.git] / sysdeps / m68k / s_isnanl.c
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1 /* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
19 #include <math.h>
20 #include "ieee754.h"
22 #undef __isnanl
23 #undef isnanl
26 /* Return nonzero if VALUE is not a number. */
27 int
28 __isnanl (long double value)
30 union ieee854_long_double u;
32 u.d = value;
34 /* IEEE 854 NaN's have the maximum possible
35 exponent and a nonzero mantissa. In Motorola's
36 interpretation the integer bit is ignored. */
37 return ((u.ieee.exponent & 0x7fff) == 0x7fff &&
38 ((u.ieee.mantissa0 & 0x7fffffff) != 0 || u.ieee.mantissa1 != 0));
41 weak_alias (__isnanl, isnanl);