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