1
/* Copyright (C) 1991, 1992, 1995, 1997, 2002 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 Lesser General Public
6
License as published by the Free Software Foundation; either
7
version 2.1 of the 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
Lesser General Public License for more details.
14
You should have received a copy of the GNU Lesser General Public
15
License along with the GNU C Library; if not, write to the Free
16
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22
/* Return 0 if VALUE is finite or NaN, +1 if it
23
is +Infinity, -1 if it is -Infinity. */
25
__isinfl (long double value)
27
union ieee854_long_double u;
31
/* An IEEE 854 infinity has an exponent with the
32
maximum possible value and a zero mantissa.
33
In Motorola's interpretation the integer bit is ignored. */
34
if ((u.ieee.exponent & 0x7fff) == 0x7fff &&
35
(u.ieee.mantissa0 & 0x7fffffff) == 0 && u.ieee.mantissa1 == 0)
36
return u.ieee.negative ? -1 : 1;
42
weak_alias (__isinfl, isinfl);