POK
copysign.c
1 /*
2  * POK header
3  *
4  * The following file is a part of the POK project. Any modification should
5  * made according to the POK licence. You CANNOT use this file or a part of
6  * this file is this part of a file for your own project
7  *
8  * For more information on the POK licence, please see our LICENCE FILE
9  *
10  * Please follow the coding guidelines described in doc/CODING_GUIDELINES
11  *
12  * Copyright (c) 2007-2009 POK team
13  *
14  * Created by julien on Fri Jan 30 14:41:34 2009
15  */
16 
17 /* @(#)s_copysign.c 5.1 93/09/24 */
18 /*
19  * ====================================================
20  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
21  *
22  * Developed at SunPro, a Sun Microsystems, Inc. business.
23  * Permission to use, copy, modify, and distribute this
24  * software is freely granted, provided that this notice
25  * is preserved.
26  * ====================================================
27  */
28 
29 /*
30  * copysign(double x, double y)
31  * copysign(x,y) returns a value with the magnitude of x and
32  * with the sign bit of y.
33  */
34 
35 #ifdef POK_NEEDS_LIBMATH
36 
37 #include <libm.h>
38 #include "math_private.h"
39 
40 double
41 copysign(double x, double y)
42 {
43  uint32_t hx,hy;
44  GET_HIGH_WORD(hx,x);
45  GET_HIGH_WORD(hy,y);
46  SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
47  return x;
48 }
49 
50 #endif