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/* $OpenBSD: isinfl.c,v 1.2 2008/12/09 19:52:33 martynas Exp $ */
/*
* Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <machine/ieee.h>
#include <math.h>
int
__isinfl(long double e)
{
struct ieee_ext *p = (struct ieee_ext *)&e;
p->ext_frach &= ~0x80000000; /* clear normalization bit */
return (p->ext_exp == EXT_EXP_INFNAN &&
p->ext_frach == 0 && p->ext_fracl == 0);
}
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