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 2003 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * On SPARC V8, _Q_cplx_lr_div(v, z, w) sets *v = *z / *w computed
29 * by the textbook formula without regard to exceptions or special
30 * cases.
31 *
32 * On SPARC V9, _Q_cplx_lr_div(z, w) returns *z / *w.
33 *
34 * This code is intended to be used only when CX_LIMITED_RANGE is ON;
35 * otherwise use _Q_cplx_div.
36 */
37
38 #if !defined(sparc) && !defined(__sparc)
39 #error This code is for SPARC only
40 #endif
41
42 #ifdef __sparcv9
43 long double _Complex
_Q_cplx_lr_div(const long double _Complex * z,const long double _Complex * w)44 _Q_cplx_lr_div(const long double _Complex *z, const long double _Complex *w)
45 {
46 long double _Complex v = 0;
47 #else
48 void
49 _Q_cplx_lr_div(long double _Complex *v, const long double _Complex *z,
50 const long double _Complex *w)
51 {
52 #endif
53 long double a, b, c, d, r;
54
55 a = ((long double *)z)[0];
56 b = ((long double *)z)[1];
57 c = ((long double *)w)[0];
58 d = ((long double *)w)[1];
59
60 r = 1.0L / (c * c + d * d);
61
62 #ifdef __sparcv9
63 ((long double *)&v)[0] = (a * c + b * d) * r;
64 ((long double *)&v)[1] = (b * c - a * d) * r;
65 return (v);
66 #else
67 ((long double *)v)[0] = (a * c + b * d) * r;
68 ((long double *)v)[1] = (b * c - a * d) * r;
69 #endif
70 }
71