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 /* 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 */ 25 26 /* 27 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 #pragma weak __carg = carg 32 33 #include <math.h> /* atan2 */ 34 #include "complex_wrapper.h" 35 36 static const double pi = 3.14159265358979311600e+00, 37 pi_lo = 1.22464679914735320717e-16; 38 39 double 40 carg(dcomplex z) 41 { 42 int ix, iy; 43 44 ix = ((int *)&(D_RE(z)))[HIWORD]; 45 iy = ((int *)&(D_IM(z)))[HIWORD]; 46 47 if ((((ix | iy) & ~0x80000000) | ((int *)&(D_RE(z)))[LOWORD] | 48 ((int *)&(D_IM(z)))[LOWORD]) == 0) { 49 /* x and y are both zero */ 50 if (ix == 0) 51 return (D_IM(z)); 52 53 return ((iy == 0) ? pi + pi_lo : -pi - pi_lo); 54 } 55 56 return (atan2(D_IM(z), D_RE(z))); 57 }