1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#include <math.h>
32
33#include "fpmath.h"
34
35/* Provided by libc.so */
36#ifndef PIC
37#undef isnan
38int
39isnan(double d)
40{
41	union IEEEd2bits u;
42
43	u.d = d;
44	return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0));
45}
46#endif /* !PIC */
47
48/*
49 * Because math.h defines __isnanf as an alias for compatibility with glibc and
50 * CUDA, we have to undefine it here to avoid redefinition errors.
51 */
52#undef __isnanf
53
54int
55__isnanf(float f)
56{
57	union IEEEf2bits u;
58
59	u.f = f;
60	return (u.bits.exp == 255 && u.bits.man != 0);
61}
62
63int
64__isnanl(long double e)
65{
66	union IEEEl2bits u;
67
68	u.e = e;
69	mask_nbit_l(u);
70	return (u.bits.exp == 32767 && (u.bits.manl != 0 || u.bits.manh != 0));
71}
72
73__weak_reference(__isnanf, isnanf);
74