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