/* @(#)w_atan2.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.

 * ====================================================

 *

 */

/* 

 * wrapper atan2(y,x)

 */

#include "fdlibm.h"

#ifdef __STDC__

	double atan2(double y, double x)	/* wrapper atan2 */

#else

	double atan2(y,x)			/* wrapper atan2 */

	double y,x;

#endif

{

#ifdef _IEEE_LIBM

	return __ieee754_atan2(y,x);

#else

	double z;

	z = __ieee754_atan2(y,x);

	if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z;

	if(x==0.0&&y==0.0) {

	        return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */

	} else

	    return z;

#endif

}