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_mul(v, z, w) sets *v = *z * *w computed by
29 * the textbook formula without regard to exceptions or special cases.
30 *
31 * On SPARC V9, _Q_cplx_lr_mul(z, w) returns *z * *w.
32 *
33 * This code is intended to be used only when CX_LIMITED_RANGE is ON;
34 * otherwise use _Q_cplx_mul.
35 */
36
37 #if !defined(sparc) && !defined(__sparc)
38 #error This code is for SPARC only
39 #endif
40
41 #ifdef __sparcv9
42 long double _Complex
_Q_cplx_lr_mul(const long double _Complex * z,const long double _Complex * w)43 _Q_cplx_lr_mul(const long double _Complex *z, const long double _Complex *w)
44 {
45 long double _Complex v = 0;
46 #else
47 void
48 _Q_cplx_lr_mul(long double _Complex *v, const long double _Complex *z,
49 const long double _Complex *w)
50 {
51 #endif
52 long double a, b, c, d;
53
54 a = ((long double *)z)[0];
55 b = ((long double *)z)[1];
56 c = ((long double *)w)[0];
57 d = ((long double *)w)[1];
58
59 #ifdef __sparcv9
60 ((long double *)&v)[0] = (a * c - b * d);
61 ((long double *)&v)[1] = (a * d + b * c);
62 return (v);
63 #else
64 ((long double *)v)[0] = (a * c - b * d);
65 ((long double *)v)[1] = (a * d + b * c);
66 #endif
67 }
68