xref: /titanic_41/usr/src/lib/libmvec/common/__vz_pow.c (revision 5b2ba9d3d1e04dde804c89e9879f7dfc9bcebf61)
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 (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
24  */
25 /*
26  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
27  * Use is subject to license terms.
28  */
29 
30 #ifdef __RESTRICT
31 #define restrict _Restrict
32 #else
33 #define restrict
34 #endif
35 
36 extern void __vz_exp(int, double *, int, double *, int, double *);
37 extern void __vz_log(int, double *, int, double *, int);
38 
39 void
__vz_pow(int n,double * restrict x,int stridex,double * restrict y,int stridey,double * restrict z,int stridez,double * restrict tmp)40 __vz_pow(int n, double * restrict x, int stridex, double * restrict y,
41 	int stridey, double * restrict z, int stridez, double * restrict tmp)
42 {
43 	double	r;
44 	int		i, j, k;
45 
46 	__vz_log(n, x, stridex, tmp, 1);
47 	stridey <<= 1;
48 	for (i = j = 0; i < n; i++, j += stridey)
49 	{
50 		k = i << 1;
51 		r = y[j] * tmp[k] - y[j+1] * tmp[k+1];
52 		tmp[k+1] = y[j+1] * tmp[k] + y[j] * tmp[k+1];
53 		tmp[k] = r;
54 	}
55 	__vz_exp(n, tmp, 1, z, stridez, tmp + n + n);
56 }
57