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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 #include <LibConfig.h>
13 #include <sys/EfiCdefs.h>
14 #if defined(LIBM_SCCS) && !defined(lint)
15 __RCSID("$NetBSD: s_copysign.c,v 1.11 2002/05/26 22:01:54 wiz 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.h"
25 #include "math_private.h"
26
27 double
28 copysign(double x, double y)
29 {
30 u_int32_t hx,hy;
31 GET_HIGH_WORD(hx,x);
32 GET_HIGH_WORD(hy,y);
33 SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
34 return x;
35 }