/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* atan2pi(x) = atan2(x)/pi
*/
#include "libm.h"
static const double invpi = 0.3183098861837906715377675;
double
atan2pi(double y, double x) {
int ix, iy;
if (x == 0.0 && y == 0.0) {
ix = ((int *)&x)[HIWORD];
iy = ((int *)&y)[HIWORD];
if (ix >= 0)
return (y);
return ((iy >= 0)? 1.0 : -1.0);
}
return (atan2(y, x) * invpi);
}