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/* w_atan2f.c -- float version of w_atan2.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */

/*
 * ====================================================
 * 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.
 * ====================================================
 */

#ifndef lint
static char rcsid[] = "$\Id: w_atan2f.c,v 1.2 1995/05/30 05:50:44 rgrimes Exp $";
#endif

/*
 * wrapper atan2f(y,x)
 */

#include "math.h"
#include "math_private.h"


#ifdef __STDC__
        float atan2f(float y, float x)          /* wrapper atan2f */
#else
        float atan2f(y,x)                       /* wrapper atan2 */
        float y,x;
#endif
{
#ifdef _IEEE_LIBM
        return __ieee754_atan2f(y,x);
#else
        float z;
        z = __ieee754_atan2f(y,x);
        if(_LIB_VERSION == _IEEE_||isnanf(x)||isnanf(y)) return z;
        if(x==(float)0.0&&y==(float)0.0) {
                /* atan2f(+-0,+-0) */
                return (float)__kernel_standard((double)y,(double)x,103);
        } else
            return z;
#endif
}