s_copysign.c revision 22808 
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#ifndef lint
14static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_copysign.c 22808 1997-02-16 18:26:31Z bde $";
15#endif
16
17/*
18 * copysign(double x, double y)
19 * copysign(x,y) returns a value with the magnitude of x and
20 * with the sign bit of y.
21 */
22
23#include "math.h"
24#include "math_private.h"
25
26#ifdef __STDC__
27	double __generic_copysign(double x, double y)
28#else
29	double __generic_copysign(x,y)
30	double x,y;
31#endif
32{
33	u_int32_t hx,hy;
34	GET_HIGH_WORD(hx,x);
35	GET_HIGH_WORD(hy,y);
36	SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
37        return x;
38}
39