gbaxpy.tcc (cxxblas/level1extensions/gbaxpy.tcc)

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/*
*   Copyright (c) 2012, Michael Lehn, Klaus Pototzky
*
*   All rights reserved.
*
*   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) Neither the name of the FLENS development group nor the names of
*      its contributors may be used to endorse or promote products derived
*      from this software without specific prior 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 COPYRIGHT
*   OWNER OR 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.
*/

#ifndef CXXBLAS_LEVEL1EXTENSIONS_GBAXPY_TCC
#define CXXBLAS_LEVEL1EXTENSIONS_GBAXPY_TCC 1

#include <cassert>
#include <cxxblas/cxxblas.h>

namespace cxxblas {

template <typename IndexType, typename ALPHA, typename MA, typename MB>
void
gbaxpy(StorageOrder order,
       Transpose trans, IndexType m, IndexType n,
       IndexType kl, IndexType ku,
       const ALPHA &alpha, const MA *A, IndexType ldA,
       MB *B, IndexType ldB)
{
    CXXBLAS_DEBUG_OUT("gbaxpy_generic");

    if (order==ColMajor) {
        gbaxpy(RowMajor, trans, n, m, ku, kl, alpha, A, ldA, B, ldB);
        return;
    }

    if (trans==NoTrans) {
        for (IndexType j=0, i=-kl; i<=ku; ++j, ++i) {
            IndexType length = (i<0) ? min(m+i,min(m,n))
                                     : min(n-i,min(m,n));
            axpy(length, alpha,
                 A+j+max(-i,0)*ldA, ldA,
                 B+j+max(-i,0)*ldB, ldB);
        }
        return;
    }

    if (trans==Conj) {
        for (IndexType j=0, i=-kl; i<=ku; ++j, ++i) {
            IndexType length = (i<0) ? min(m+i,min(m,n))
                                     : min(n-i,min(m,n));
            acxpy(length, alpha,
                  A+j+max(-i,0)*ldA, ldA,
                  B+j+max(-i,0)*ldB, ldB);
        }
        return;
    }

    if (trans==Trans) {
        for (IndexType j=0, J=kl+ku, i=-ku, I=ku; i<=kl; ++j, --J, ++i, --I) {
            IndexType length = (i<0) ? min(m+i,min(m,n))
                                     : min(n-i,min(m,n));
            axpy(length, alpha,
                 A+j+max(-i,0)*ldA, ldA,
                 B+J+max(-I,0)*ldB, ldB);
        }
        return;
    }

    for (IndexType j=0, J=kl+ku, i=-ku, I=ku; i<=kl; ++j, --J, ++i, --I) {
        IndexType length = (i<0) ? min(m+i,min(m,n))
                                 : min(n-i,min(m,n));
        acxpy(length, alpha,
              A+j+max(-i,0)*ldA, ldA,
              B+J+max(-I,0)*ldB, ldB);
    }

    return;
}

} // namespace cxxblas

#endif // CXXBLAS_LEVEL1EXTENSIONS_GBAXPY_TCC