1 /* $NetBSD: s_copysignl.c,v 1.5 2015/05/14 19:26:12 joerg 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 1.5 2015/05/14 19:26:12 joerg Exp $");
30 #include "namespace.h"
31
32 #include <math.h>
33 #include <machine/ieee.h>
34
35 #if defined(__HAVE_LONG_DOUBLE) || defined(__HAVE_IBM_LONGDOUBLE)
36
37 #ifdef __weak_alias
__weak_alias(copysignl,_copysignl)38 __weak_alias(copysignl, _copysignl)
39 #endif
40
41 /*
42 * copysignl(long double x, long double y)
43 * This function returns a value with the magnitude of x and the sign of y.
44 */
45 #ifdef EXT_EXP_INFNAN
46 long double
47 copysignl(long double x, long double y)
48 {
49 union ieee_ext_u ux, uy;
50
51 ux.extu_ld = x;
52 uy.extu_ld = y;
53
54 ux.extu_ext.ext_sign = uy.extu_ext.ext_sign;
55
56 return (ux.extu_ld);
57 }
58 #elif defined(__HAVE_IBM_LONGDOUBLE)
59 long double
60 copysignl(long double x, long double y)
61 {
62 union ldbl_u ux, uy;
63
64 ux.ldblu_ld = x;
65 uy.ldblu_ld = y;
66 ux.ldblu_d[0] = copysign(ux.ldblu_d[0], uy.ldblu_d[0]);
67 ux.ldblu_d[1] = copysign(ux.ldblu_d[1], uy.ldblu_d[1]);
68
69 return ux.ldblu_ld;
70 }
71 #endif
72 #endif /* __HAVE_LONG_DOUBLE || __HAVE_IBM_LONGDOUBLE */
73