atl_drefsyrkln.c

来自「基于Blas CLapck的.用过的人知道是干啥的」· C语言 代码 · 共 103 行

/* ---------------------------------------------------------------------
 *
 * -- Automatically Tuned Linear Algebra Software (ATLAS)
 *    (C) Copyright 2000 All Rights Reserved
 *
 * -- ATLAS routine -- Version 3.2 -- December 25, 2000
 *
 * Author         : Antoine P. Petitet
 * Originally developed at the University of Tennessee,
 * Innovative Computing Laboratory, Knoxville TN, 37996-1301, USA.
 *
 * ---------------------------------------------------------------------
 *
 * -- Copyright notice and Licensing terms:
 *
 *  Redistribution  and  use in  source and binary forms, with or without
 *  modification, are  permitted provided  that the following  conditions
 *  are met:
 *
 * 1. Redistributions  of  source  code  must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce  the above copyright
 *    notice,  this list of conditions, and the  following disclaimer in
 *    the documentation and/or other materials provided with the distri-
 *    bution.
 * 3. The name of the University,  the ATLAS group,  or the names of its
 *    contributors  may not be used to endorse or promote products deri-
 *    ved from this software without specific written permission.
 *
 * -- Disclaimer:
 *
 * THIS  SOFTWARE  IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,  INCLUDING,  BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,  INDIRECT, INCIDENTAL, SPE-
 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO,  PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEO-
 * RY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT  (IN-
 * CLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ---------------------------------------------------------------------
 */
/*
 * Include files
 */
#include "atlas_refmisc.h"
#include "atlas_reflvl3.h"
#include "atlas_reflevel3.h"

void ATL_drefsyrkLN
(
   const int                  N,
   const int                  K,
   const double               ALPHA,
   const double               * A,
   const int                  LDA,
   const double               BETA,
   double                     * C,
   const int                  LDC
)
{
/*
 * Purpose
 * =======
 *
 * ATL_drefsyrkLN( ... )
 *
 * <=>
 *
 * ATL_drefsyrk( AtlasLower, AtlasNoTrans, ... )
 *
 * See ATL_drefsyrk for details.
 *
 * ---------------------------------------------------------------------
 */
/*
 * .. Local Variables ..
 */
   register double            t0;
   int                        i, iail, iaj, iajl, icij, j, jal, jcj, l;
/* ..
 * .. Executable Statements ..
 *
 */
   for( j = 0, iaj = 0, jcj = 0; j < N; j++, iaj += 1, jcj += LDC )
   {
      Mdvscal( N-j, BETA, C+j+jcj, 1 );
      for( l = 0, iajl = iaj, jal = 0; l < K; l++, iajl += LDA, jal += LDA )
      {
         t0 = ALPHA * A[iajl];
         for( i = j, iail = j+jal, icij = j+jcj;
              i < N; i++, iail += 1,     icij += 1 )
         { C[icij] += t0 * A[iail]; }
      }
   }
/*
 * End of ATL_drefsyrkLN
 */
}