/* $NetBSD: isinff_ieee754.c,v 1.1 2004/03/04 23:42:39 kleink Exp $ */ | |
/* | |
* Copyright (c) 1992, 1993 | |
* The Regents of the University of California. All rights reserved. | |
* | |
* This software was developed by the Computer Systems Engineering group | |
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and | |
* contributed to Berkeley. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* 1. Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* 2. Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* 3. Neither the name of the University nor the names of its contributors | |
* may be used to endorse or promote products derived from this software | |
* without specific prior written permission. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
* SUCH DAMAGE. | |
* | |
* from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp | |
*/ | |
#include <LibConfig.h> | |
#include <sys/EfiCdefs.h> | |
#if defined(LIBC_SCCS) && !defined(lint) | |
#if 0 | |
static char sccsid[] = "@(#)isinf.c 8.1 (Berkeley) 6/4/93"; | |
#else | |
__RCSID("$NetBSD: isinff_ieee754.c,v 1.1 2004/03/04 23:42:39 kleink Exp $"); | |
#endif | |
#endif /* LIBC_SCCS and not lint */ | |
#include <machine/ieee.h> | |
#include <math.h> | |
/* | |
* 7.12.3.3 isinf - test for infinity | |
* IEEE 754 single-precision version | |
*/ | |
int | |
__isinff(float x) | |
{ | |
union ieee_single_u u; | |
u.sngu_f = x; | |
return (u.sngu_sng.sng_exp == SNG_EXP_INFNAN && | |
u.sngu_sng.sng_frac == 0); | |
} |