1 /* @(#)s_copysign.c 5.1 93/09/24 */
2 /*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
9 * is preserved.
10 * ====================================================
11 */
12
13 #if defined(LIBM_SCCS) && !defined(lint)
14 static const char rcsid[] =
15 "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $";
16 #endif
17
18 /*
19 * copysign(double x, double y)
20 * copysign(x,y) returns a value with the magnitude of x and
21 * with the sign bit of y.
22 */
23
24 #include "math_libm.h"
25 #include "math_private.h"
26
libm_hidden_proto(copysign)27 libm_hidden_proto(copysign)
28 #ifdef __STDC__
29 double copysign(double x, double y)
30 #else
31 double copysign(x, y)
32 double x, y;
33 #endif
34 {
35 u_int32_t hx, hy;
36 GET_HIGH_WORD(hx, x);
37 GET_HIGH_WORD(hy, y);
38 SET_HIGH_WORD(x, (hx & 0x7fffffff) | (hy & 0x80000000));
39 return x;
40 }
41
42 libm_hidden_def(copysign)
43