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