s_isnan.c revision 209110
1/*-
2 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/lib/msun/src/s_isnan.c 209110 2010-06-12 17:32:05Z das $
27 */
28
29#include <math.h>
30
31#include "fpmath.h"
32
33/* Provided by libc */
34#if 0
35int
36isnan(double d)
37{
38	union IEEEd2bits u;
39
40	u.d = d;
41	return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0));
42}
43#endif
44
45int
46__isnanf(float f)
47{
48	union IEEEf2bits u;
49
50	u.f = f;
51	return (u.bits.exp == 255 && u.bits.man != 0);
52}
53
54int
55__isnanl(long double e)
56{
57	union IEEEl2bits u;
58
59	u.e = e;
60	mask_nbit_l(u);
61	return (u.bits.exp == 32767 && (u.bits.manl != 0 || u.bits.manh != 0));
62}
63
64__weak_reference(__isnanf, isnanf);
65