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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * _X_cplx_lr_div(z, w) returns z / w computed by the textbook
29 * formula without regard to exceptions or special cases.
30 *
31 * This code is intended to be used only when CX_LIMITED_RANGE is
32 * ON; otherwise use _X_cplx_div.
33 */
34
35 #if !defined(i386) && !defined(__i386) && !defined(__amd64)
36 #error This code is for x86 only
37 #endif
38
39 long double _Complex
_X_cplx_lr_div(long double _Complex z,long double _Complex w)40 _X_cplx_lr_div(long double _Complex z, long double _Complex w)
41 {
42 long double _Complex v = 0;
43 long double a, b, c, d, r;
44
45 a = ((long double *)&z)[0];
46 b = ((long double *)&z)[1];
47 c = ((long double *)&w)[0];
48 d = ((long double *)&w)[1];
49 r = 1.0f / (c * c + d * d);
50 ((long double *)&v)[0] = (a * c + b * d) * r;
51 ((long double *)&v)[1] = (b * c - a * d) * r;
52 return (v);
53 }
54