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 <math.h>
30
31 #include "fpmath.h"
32
33 /* Provided by libc.so */
34 #ifndef PIC
35 #undef isnan
36 int
isnan(double d)37 isnan(double d)
38 {
39 union IEEEd2bits u;
40
41 u.d = d;
42 return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0));
43 }
44 #endif /* !PIC */
45
46 /*
47 * Because math.h defines __isnanf as an alias for compatibility with glibc and
48 * CUDA, we have to undefine it here to avoid redefinition errors.
49 */
50 #undef __isnanf
51
52 int
__isnanf(float f)53 __isnanf(float f)
54 {
55 union IEEEf2bits u;
56
57 u.f = f;
58 return (u.bits.exp == 255 && u.bits.man != 0);
59 }
60
61 int
__isnanl(long double e)62 __isnanl(long double e)
63 {
64 union IEEEl2bits u;
65
66 u.e = e;
67 mask_nbit_l(u);
68 return (u.bits.exp == 32767 && (u.bits.manl != 0 || u.bits.manh != 0));
69 }
70
71 __weak_reference(__isnanf, isnanf);
72