1*2fe8fb19SBen Gras /* $NetBSD: isnand_ieee754.c,v 1.1 2004/03/04 23:42:39 kleink Exp $ */
2*2fe8fb19SBen Gras
3*2fe8fb19SBen Gras /*
4*2fe8fb19SBen Gras * Copyright (c) 1992, 1993
5*2fe8fb19SBen Gras * The Regents of the University of California. All rights reserved.
6*2fe8fb19SBen Gras *
7*2fe8fb19SBen Gras * This software was developed by the Computer Systems Engineering group
8*2fe8fb19SBen Gras * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9*2fe8fb19SBen Gras * contributed to Berkeley.
10*2fe8fb19SBen Gras *
11*2fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without
12*2fe8fb19SBen Gras * modification, are permitted provided that the following conditions
13*2fe8fb19SBen Gras * are met:
14*2fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright
15*2fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer.
16*2fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright
17*2fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the
18*2fe8fb19SBen Gras * documentation and/or other materials provided with the distribution.
19*2fe8fb19SBen Gras * 3. Neither the name of the University nor the names of its contributors
20*2fe8fb19SBen Gras * may be used to endorse or promote products derived from this software
21*2fe8fb19SBen Gras * without specific prior written permission.
22*2fe8fb19SBen Gras *
23*2fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24*2fe8fb19SBen Gras * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25*2fe8fb19SBen Gras * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26*2fe8fb19SBen Gras * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27*2fe8fb19SBen Gras * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28*2fe8fb19SBen Gras * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29*2fe8fb19SBen Gras * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30*2fe8fb19SBen Gras * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31*2fe8fb19SBen Gras * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32*2fe8fb19SBen Gras * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33*2fe8fb19SBen Gras * SUCH DAMAGE.
34*2fe8fb19SBen Gras *
35*2fe8fb19SBen Gras * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp
36*2fe8fb19SBen Gras */
37*2fe8fb19SBen Gras
38*2fe8fb19SBen Gras #include <sys/cdefs.h>
39*2fe8fb19SBen Gras #if defined(LIBC_SCCS) && !defined(lint)
40*2fe8fb19SBen Gras #if 0
41*2fe8fb19SBen Gras static char sccsid[] = "@(#)isinf.c 8.1 (Berkeley) 6/4/93";
42*2fe8fb19SBen Gras #else
43*2fe8fb19SBen Gras __RCSID("$NetBSD: isnand_ieee754.c,v 1.1 2004/03/04 23:42:39 kleink Exp $");
44*2fe8fb19SBen Gras #endif
45*2fe8fb19SBen Gras #endif /* LIBC_SCCS and not lint */
46*2fe8fb19SBen Gras
47*2fe8fb19SBen Gras #include <machine/ieee.h>
48*2fe8fb19SBen Gras #include <math.h>
49*2fe8fb19SBen Gras
50*2fe8fb19SBen Gras /* libc.so.12 ABI compatbility */
51*2fe8fb19SBen Gras #ifdef __weak_alias
__weak_alias(isnan,__isnand)52*2fe8fb19SBen Gras __weak_alias(isnan,__isnand)
53*2fe8fb19SBen Gras #endif
54*2fe8fb19SBen Gras
55*2fe8fb19SBen Gras /*
56*2fe8fb19SBen Gras * 7.12.3.4 isnan - test for a NaN
57*2fe8fb19SBen Gras * IEEE 754 double-precision version
58*2fe8fb19SBen Gras */
59*2fe8fb19SBen Gras int
60*2fe8fb19SBen Gras __isnand(double x)
61*2fe8fb19SBen Gras {
62*2fe8fb19SBen Gras union ieee_double_u u;
63*2fe8fb19SBen Gras
64*2fe8fb19SBen Gras u.dblu_d = x;
65*2fe8fb19SBen Gras
66*2fe8fb19SBen Gras return (u.dblu_dbl.dbl_exp == DBL_EXP_INFNAN &&
67*2fe8fb19SBen Gras (u.dblu_dbl.dbl_frach != 0 || u.dblu_dbl.dbl_fracl != 0));
68*2fe8fb19SBen Gras }
69