sbumv.tcc (ulmblas/impl/level2/sbumv.tcc)

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/*

 * Copyright (C) 2014, The University of Texas at Austin

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are

 * met:

 *  - Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *  - 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.

 *  - Neither the name of The University of Texas at Austin 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

 * HOLDER 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.

 *

 */

/*

 * Copyright (C) 2014-2015, Michael Lehn

 *

 * ulmBLAS adopted general ideas from BLIS.  Using micro kernels from BLIS

 * only requires minor modifications,

 *

 */

#ifndef ULMBLAS_IMPL_LEVEL2_SBUMV_TCC

#define ULMBLAS_IMPL_LEVEL2_SBUMV_TCC 1

#include <ulmblas/impl/level1extensions/dotaxpy.h>

#include <ulmblas/impl/level1/scal.h>

#include <ulmblas/impl/level2/sbumv.h>

namespace ulmBLAS {

template <typename IndexType, typename Alpha, typename TA, typename TX,

          typename Beta, typename TY>

void

sbumv(IndexType    n,

      IndexType    k,

      const Alpha  &alpha,

      const TA     *A,

      IndexType    ldA,

      const TX     *x,

      IndexType    incX,

      const Beta   &beta,

      TY           *y,

      IndexType    incY)

{

    typedef decltype(Alpha(0)*TA(0)*TX(0)+Beta(0)*TY(0))  T;

    if (n==0 || (alpha==Alpha(0) && beta==Beta(1))) {

        return;

    }

    scal(n, beta, y, incY);

    if (alpha==Alpha(0)) {

        return;

    }

    for (IndexType j=0; j<n; ++j) {

        IndexType i0  = std::max(IndexType(0), k-j);

        IndexType i1  = k - std::max(IndexType(0), (j+1)-n);

        IndexType len = std::max(IndexType(0), i1-i0+1);

        IndexType i0XY = std::max(IndexType(0), j-k);

        IndexType i1XY = i0XY + len - 1;

        T         rho;

        dotaxpy(len-1, false, false, false,

                alpha*x[j*incX],

                &A[i0], IndexType(1),

                &x[i0XY*incX], incX,

                &y[i0XY*incY], incY,

                rho);

        y[i1XY*incY] += alpha*(rho+A[i1]*x[i1XY*incX]);

        A += ldA;

    }

}

} // namespace ulmBLAS

#endif // ULMBLAS_IMPL_LEVEL2_SBUMV_TCC