1 /* $NetBSD: s_copysignl.c,v 1.6 2019/02/04 04:37:50 mrg Exp $ */
2
3 /*-
4 * Copyright (c) 2010 The NetBSD Foundation, Inc.
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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28 #include <sys/cdefs.h>
29 __RCSID("$NetBSD: s_copysignl.c,v 1.6 2019/02/04 04:37:50 mrg Exp $");
30 #include "namespace.h"
31
32 #include <math.h>
33 #include <machine/ieee.h>
34 #include <string.h>
35
36 #if defined(__HAVE_LONG_DOUBLE) || defined(__HAVE_IBM_LONGDOUBLE)
37
38 #ifdef __weak_alias
__weak_alias(copysignl,_copysignl)39 __weak_alias(copysignl, _copysignl)
40 #endif
41
42 /*
43 * copysignl(long double x, long double y)
44 * This function returns a value with the magnitude of x and the sign of y.
45 */
46 #ifdef EXT_EXP_INFNAN
47 long double
48 copysignl(long double x, long double y)
49 {
50 union ieee_ext_u ux, uy;
51
52 ux.extu_ld = x;
53 uy.extu_ld = y;
54
55 ux.extu_ext.ext_sign = uy.extu_ext.ext_sign;
56
57 return (ux.extu_ld);
58 }
59 #elif defined(__HAVE_IBM_LONGDOUBLE)
60 long double
61 copysignl(long double x, long double y)
62 {
63 union ldbl_u ux, uy;
64
65 memset(&ux, 0, sizeof ux);
66 memset(&uy, 0, sizeof uy);
67 ux.ldblu_ld = x;
68 uy.ldblu_ld = y;
69 ux.ldblu_d[0] = copysign(ux.ldblu_d[0], uy.ldblu_d[0]);
70 ux.ldblu_d[1] = copysign(ux.ldblu_d[1], uy.ldblu_d[1]);
71
72 return ux.ldblu_ld;
73 }
74 #endif
75 #endif /* __HAVE_LONG_DOUBLE || __HAVE_IBM_LONGDOUBLE */
76