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 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * _D_cplx_lr_div(z, w) returns z / w computed by the textbook
31 * formula without regard to exceptions or special cases.
32 *
33 * This code is intended to be used only when CX_LIMITED_RANGE is
34 * ON; otherwise use _D_cplx_div.
35 */
36
37 #if !defined(i386) && !defined(__i386) && !defined(__amd64)
38 #error This code is for x86 only
39 #endif
40
41 double _Complex
_D_cplx_lr_div(double _Complex z,double _Complex w)42 _D_cplx_lr_div(double _Complex z, double _Complex w)
43 {
44 double _Complex v;
45 long double a, b, c, d, r;
46
47 /* LINTED alignment */
48 a = ((double *)&z)[0];
49 /* LINTED alignment */
50 b = ((double *)&z)[1];
51 /* LINTED alignment */
52 c = ((double *)&w)[0];
53 /* LINTED alignment */
54 d = ((double *)&w)[1];
55 r = 1.0f / (c * c + d * d);
56 /* LINTED alignment */
57 ((double *)&v)[0] = (double)((a * c + b * d) * r);
58 /* LINTED alignment */
59 ((double *)&v)[1] = (double)((b * c - a * d) * r);
60 return (v);
61 }
62