ref: 75c92428225428c8fde2d015f010e608a0b12f1d
dir: purgatorio/libmath/fdlibm/s_copysign.c
/* derived from /netlib/fdlibm */
/* @(#)s_copysign.c 1.3 95/01/18 */
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunSoft, 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"
double copysign(double x, double y)
{
__HI(x) = (__HI(x)&0x7fffffff)|(__HI(y)&0x80000000);
return x;
}