ATL_tbnrm1.c (bench/ATL

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/*

 *             Automatically Tuned Linear Algebra Software v3.10.1

 *                   (C) Copyright 1999 Antoine P. Petitet

 *

 * 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 distribution.

 *   3. The name of the ATLAS group or the names of its contributers may

 *      not be used to endorse or promote products derived from this

 *      software without specific written permission.

 *

 * 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 ATLAS GROUP OR ITS CONTRIBUTORS

 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 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 THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 */

#include "atlas_misc.h"

#include "atlas_tst.h"

#include "atlas_level1.h"

TYPE Mjoin(PATL,tbnrm1)(const enum ATLAS_UPLO UPLO, const enum ATLAS_DIAG DIAG,

                        const int N, const int K, const TYPE *A, const int LDA)

/*

 * Calculates the 1-norm of a triangular band matrix

 */

{

   int i, i0, i1, iaij, j, jaj, l, lda2 = ( LDA SHIFT );

   TYPE max=0.0, t0;

   if( UPLO == AtlasUpper )

   {

      for( j = 0, jaj  = 0; j < N; j++, jaj += lda2 )

      {

         l       = K - j;

         i0      = ( j - K > 0 ? j - K : 0 );

         t0 = ATL_rzero;

         for( i = i0, iaij = ((l+i0) SHIFT)+jaj; i < j; i++, iaij += (1 SHIFT) )

         {

#ifdef TREAL

            t0 += Mabs( A[iaij] );

#else

            t0 += Mabs( A[iaij] ) + Mabs( A[iaij+1] );

#endif

         }

         if( DIAG == AtlasNonUnit ) t0 += ATL_rone;

         if (t0 > max) max = t0;

      }

   }

   else

   {

      for( j = N-1, jaj = (N-1)*lda2; j >= 0; j--, jaj -= lda2 )

      {

         t0 = ATL_rzero;

         if( DIAG == AtlasNonUnit ) t0 += ATL_rone;

         i1   = ( N - 1 > j + K ? j + K : N - 1 );

         for( i  = j+1, iaij = (1 SHIFT)+jaj; i <= i1; i++, iaij += (1 SHIFT) )

         {

#ifdef TREAL

            t0 += Mabs( A[iaij] );

#else

            t0 += Mabs( A[iaij] ) + Mabs( A[iaij+1] );

#endif

         }

         if (t0 > max) max = t0;

      }

   }

   return(max);

}