1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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
29 #include <machine/float.h>
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
40 __weak_reference(__isinf, isinf);
41
42 int
__isinf(double d)43 __isinf(double d)
44 {
45 union IEEEd2bits u;
46
47 u.d = d;
48 return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
49 }
50
51 int
__isinff(float f)52 __isinff(float f)
53 {
54 union IEEEf2bits u;
55
56 u.f = f;
57 return (u.bits.exp == 255 && u.bits.man == 0);
58 }
59
60 int
__isinfl(long double e)61 __isinfl(long double e)
62 {
63 union IEEEl2bits u;
64
65 u.e = e;
66 mask_nbit_l(u);
67 #if LDBL_MANT_DIG == 53
68 return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
69 #else
70 return (u.bits.exp == 32767 && u.bits.manl == 0 && u.bits.manh == 0);
71 #endif
72 }
73