NetBSD-5.0.2/lib/libm/src/w_atan2f.c

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

#include <sys/cdefs.h>
#if defined(LIBM_SCCS) && !defined(lint)
__RCSID("$NetBSD: w_atan2f.c,v 1.7 2007/08/10 21:20:36 drochner Exp $");
#endif

/*
 * wrapper atan2f(y,x)
 */

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

#ifdef __weak_alias
__weak_alias(atan2f, _atan2f)
#endif

float
atan2f(float y, float x)		/* wrapper atan2f */
{
#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
}