base/math/s_copysign.c

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#if !defined(__ppc__)
/* @(#)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.
 * ====================================================
 */

#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $";
#endif

/*
 * 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 "mathP.h"

#ifdef __STDC__
    double copysign(double x, double y)
#else
    double copysign(x,y)
    double x,y;
#endif
{
    u_int32_t hx,hy;
    GET_HIGH_WORD(hx,x);
    GET_HIGH_WORD(hy,y);
    SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
        return x;
}
#endif

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