usr/src/lib/libmvec/common/__vc_pow.c

   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 __vc_exp(int, float *, int, float *, int, float *);
  37 extern void __vc_log(int, float *, int, float *, int);
  38
  39 void
  40 __vc_pow(int n, float * restrict x, int stridex, float * restrict y,
  41         int stridey, float * restrict z, int stridez, float * restrict tmp)
  42 {
  43         float   r;
  44         int             i, j, k;
  45
  46         __vc_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         __vc_exp(n, tmp, 1, z, stridez, tmp + n + n);
  56 }