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 #include <sys/cdefs.h>
14 __FBSDID("$FreeBSD$");
15 
16 /*
17  * copysign(double x, double y)
18  * copysign(x,y) returns a value with the magnitude of x and
19  * with the sign bit of y.
20  */
21 
22 #include "math.h"
23 #include "math_private.h"
24 
25 double
copysign(double x,double y)26 copysign(double x, double y)
27 {
28     u_int32_t hx,hy;
29     GET_HIGH_WORD(hx,x);
30     GET_HIGH_WORD(hy,y);
31     SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
32     return x;
33 }
34