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 /*
14 * copysign(double x, double y)
15 * copysign(x,y) returns a value with the magnitude of x and
16 * with the sign bit of y.
17 */
18
19 #include <float.h>
20 #include <math.h>
21
22 #include "math_private.h"
23
24 double
copysign(double x,double y)25 copysign(double x, double y)
26 {
27 u_int32_t hx,hy;
28 GET_HIGH_WORD(hx,x);
29 GET_HIGH_WORD(hy,y);
30 SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
31 return x;
32 }
33 DEF_STD(copysign);
34 LDBL_MAYBE_CLONE(copysign);
35