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/*
36 * XXX These routines belong in libm, but they must remain in libc for
37 *     binary compat until we can bump libm's major version number.
38 *
39 * Note this only applies to the dynamic versions of libm and libc, so
40 * for the static and profiled versions we stub out the definitions.
41 * Otherwise you cannot link statically to libm and libc at the same
42 * time, when calling both functions.
43 */
44
45#ifdef PIC
46/*
47 * Because math.h defines __isnan and __isnanf as aliases for compatibility with
48 * glibc and CUDA, we have to undefine them here to avoid redefinition errors.
49 */
50#undef __isnan
51#undef __isnanf
52
53__weak_reference(__isnan, isnan);
54__weak_reference(__isnanf, isnanf);
55
56int
57__isnan(double d)
58{
59	union IEEEd2bits u;
60
61	u.d = d;
62	return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0));
63}
64
65int
66__isnanf(float f)
67{
68	union IEEEf2bits u;
69
70	u.f = f;
71	return (u.bits.exp == 255 && u.bits.man != 0);
72}
73#endif /* PIC */
74