1 /* 2 * CDDL HEADER START 3 * 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. 7 * 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. 12 * 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] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23 */ 24 /* 25 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #pragma weak atan2pi = __atan2pi 30 31 /* 32 * atan2pi(x) = atan2(x)/pi 33 */ 34 35 #include "libm.h" 36 37 static const double invpi = 0.3183098861837906715377675; 38 39 double 40 atan2pi(double y, double x) { 41 int ix, iy; 42 43 if (x == 0.0 && y == 0.0) { 44 ix = ((int *)&x)[HIWORD]; 45 iy = ((int *)&y)[HIWORD]; 46 if (ix >= 0) 47 return (y); 48 return ((iy >= 0)? 1.0 : -1.0); 49 } 50 return (atan2(y, x) * invpi); 51 } 52