prime/src/Runtime/s_copysign.c

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/* @(#)s_copysign.c 1.2 95/01/04 */
/*
* ====================================================
* 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 "fdlibm.h"
#ifdef __STDC__
double copysign(double x, double y)
#else
double __copysign(x, y)
double x, y;
#endif
{
__HI(x) = (__HI(x) & 0x7fffffff) | (__HI(y) & 0x80000000);
return x;
}