glibc/sysdeps/m68k/s_isinfl.c
Andreas Jaeger 41bdb6e20c Update to LGPL v2.1.
2001-07-06  Paul Eggert  <eggert@twinsun.com>

	* manual/argp.texi: Remove ignored LGPL copyright notice; it's
	not appropriate for documentation anyway.
	* manual/libc-texinfo.sh: "Library General Public License" ->
	"Lesser General Public License".

2001-07-06  Andreas Jaeger  <aj@suse.de>

	* All files under GPL/LGPL version 2: Place under LGPL version
	2.1.
2001-07-06 04:58:11 +00:00

46 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; 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 __isinfl
#undef isinfl
/* Return 0 if VALUE is finite or NaN, +1 if it
is +Infinity, -1 if it is -Infinity. */
int
__isinfl (long double value)
{
union ieee854_long_double u;
u.d = value;
/* An IEEE 854 infinity has an exponent with the
maximum possible value and a zero mantissa.
In Motorola's interpretation the integer bit is ignored. */
if ((u.ieee.exponent & 0x7fff) == 0x7fff &&
(u.ieee.mantissa0 & 0x7fffffff) == 0 && u.ieee.mantissa1 == 0)
return u.ieee.negative ? -1 : 1;
return 0;
}
weak_alias (__isinfl, isinfl);