about summary refs log tree commit diff
path: root/src/math/s_copysign.c
blob: 59d3877c77cd9055eab5b800c5a6880958d32568 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
/* @(#)s_copysign.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

/*
 * copysign(double x, double y)
 * copysign(x,y) returns a value with the magnitude of x and
 * with the sign bit of y.
 */

#include <math.h>
#include "math_private.h"

double
copysign(double x, double y)
{
        uint32_t hx,hy;
        GET_HIGH_WORD(hx,x);
        GET_HIGH_WORD(hy,y);
        SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
        return x;
}