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 * $FreeBSD$
27 */
28
29#include <math.h>
30
31#include "fpmath.h"
32
33/*
34 * XXX These routines belong in libm, but they must remain in libc for
35 *     binary compat until we can bump libm's major version number.
36 */
37
38__weak_reference(__isinf, isinf);
39
40int
41__isinf(double d)
42{
43	union IEEEd2bits u;
44
45	u.d = d;
46	return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
47}
48
49int
50__isinff(float f)
51{
52	union IEEEf2bits u;
53
54	u.f = f;
55	return (u.bits.exp == 255 && u.bits.man == 0);
56}
57
58int
59__isinfl(long double e)
60{
61	union IEEEl2bits u;
62
63	u.e = e;
64	mask_nbit_l(u);
65#ifndef __alpha__
66	return (u.bits.exp == 32767 && u.bits.manl == 0 && u.bits.manh == 0);
67#else
68	return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
69#endif
70}
71