/* @(#)w_atan2.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.
 * ====================================================
 *
 */

/*
 * 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
}