69 lines
2.5 KiB
C
69 lines
2.5 KiB
C
|
/* $NetBSD: isnand_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 <sys/cdefs.h>
|
||
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
||
|
|
#if 0
|
||
|
|
static char sccsid[] = "@(#)isinf.c 8.1 (Berkeley) 6/4/93";
|
||
|
|
#else
|
||
|
|
__RCSID("$NetBSD: isnand_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>
|
||
|
|
|
||
|
|
/* libc.so.12 ABI compatbility */
|
||
|
|
#ifdef __weak_alias
|
||
|
|
__weak_alias(isnan,__isnand)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 7.12.3.4 isnan - test for a NaN
|
||
|
|
* IEEE 754 double-precision version
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
__isnand(double x)
|
||
|
|
{
|
||
|
|
union ieee_double_u u;
|
||
|
|
|
||
|
|
u.dblu_d = x;
|
||
|
|
|
||
|
|
return (u.dblu_dbl.dbl_exp == DBL_EXP_INFNAN &&
|
||
|
|
(u.dblu_dbl.dbl_frach != 0 || u.dblu_dbl.dbl_fracl != 0));
|
||
|
|
}
|