_Q_cplx_lr_mul.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* On SPARC V8, _Q_cplx_lr_mul(v, z, w) sets *v = *z * *w computed by
* the textbook formula without regard to exceptions or special cases.
*
* On SPARC V9, _Q_cplx_lr_mul(z, w) returns *z * *w.
*
* This code is intended to be used only when CX_LIMITED_RANGE is ON;
* otherwise use _Q_cplx_mul.
*/
#endif
#ifdef __sparcv9
long double _Complex
_Q_cplx_lr_mul(const long double _Complex *z, const long double _Complex *w)
{
long double _Complex v;
#else
void
_Q_cplx_lr_mul(long double _Complex *v, const long double _Complex *z,
const long double _Complex *w)
{
#endif
long double a, b, c, d;
a = ((long double *)z)[0];
b = ((long double *)z)[1];
c = ((long double *)w)[0];
d = ((long double *)w)[1];
#ifdef __sparcv9
((long double *)&v)[0] = (a * c - b * d);
((long double *)&v)[1] = (a * d + b * c);
return (v);
#else
((long double *)v)[0] = (a * c - b * d);
((long double *)v)[1] = (a * d + b * c);
#endif
}