SDL  2.0
s_copysign.c
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1 /*
2  * ====================================================
3  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
4  *
5  * Developed at SunPro, a Sun Microsystems, Inc. business.
6  * Permission to use, copy, modify, and distribute this
7  * software is freely granted, provided that this notice
8  * is preserved.
9  * ====================================================
10  */
11 
12 /*
13  * copysign(double x, double y)
14  * copysign(x,y) returns a value with the magnitude of x and
15  * with the sign bit of y.
16  */
17 
18 #include "math_libm.h"
19 #include "math_private.h"
20 
21 double copysign(double x, double y)
22 {
23  u_int32_t hx,hy;
24  GET_HIGH_WORD(hx,x);
25  GET_HIGH_WORD(hy,y);
26  SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
27  return x;
28 }
29 libm_hidden_def(copysign)