r2k.tcc (flens/blas/level3/r2k.tcc)

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/*
*   Copyright (c) 2010, Michael Lehn
*
*   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 FLENS_BLAS_LEVEL3_R2K_TCC
#define FLENS_BLAS_LEVEL3_R2K_TCC

#include <flens/blas/closures/closures.h>
#include <flens/blas/level3/level3.h>
#include <flens/typedefs.h>

namespace flens { namespace blas {

//-- her2k
template <typename ALPHA, typename MA, typename MB, typename BETA, typename MC>
typename RestrictTo<IsGeMatrix<MA>::value
                 && IsGeMatrix<MB>::value
                 && IsHeMatrix<MC>::value,
         void>::Type
r2k(Transpose           trans,
    const ALPHA         &alpha,
    const MA            &A,
    const MB            &B,
    const BETA          &beta,
    MC                  &&C)
{
    typedef typename RemoveRef<MC>::Type MatrixC;
    typedef typename MatrixC::IndexType  IndexType;

    IndexType n = (trans==NoTrans) ? A.numRows()
                                   : A.numCols();
    IndexType k = (trans==NoTrans) ? A.numCols()
                                   : A.numRows();

    ASSERT(A.numRows()==B.numRows());
    ASSERT(A.numCols()==B.numCols());
    ASSERT((beta==static_cast<BETA>(0)) || (C.dim()==n));

    if (C.dim()!=n) {
        C.resize(n, n);
    }

#   ifdef HAVE_CXXBLAS_HER2K
    cxxblas::her2k(C.order(), C.upLo(), trans,
                   n, k,
                   alpha,
                   A.data(), A.leadingDimension(),
                   B.data(), B.leadingDimension(),
                   beta,
                   C.data(), C.leadingDimension());
#   else
    ASSERT(0);
#   endif
}

//-- syr2k
template <typename ALPHA, typename MA, typename MB, typename BETA, typename MC>
typename RestrictTo<IsGeMatrix<MA>::value
                 && IsGeMatrix<MB>::value
                 && IsSyMatrix<MC>::value,
         void>::Type
r2k(Transpose           trans,
    const ALPHA         &alpha,
    const MA            &A,
    const MB            &B,
    const BETA          &beta,
    MC                  &&C)
{
    typedef typename RemoveRef<MC>::Type MatrixC;
    typedef typename MatrixC::IndexType  IndexType;

    IndexType n = (trans==NoTrans) ? A.numRows()
                                   : A.numCols();
    IndexType k = (trans==NoTrans) ? A.numCols()
                                   : A.numRows();

    ASSERT(A.numRows()==B.numRows());
    ASSERT(A.numCols()==B.numCols());
    ASSERT((beta==static_cast<BETA>(0)) || (C.dim()==n));

    if (C.dim()!=n) {
        C.resize(n, n);
    }

#   ifdef HAVE_CXXBLAS_SYR2K
    cxxblas::syr2k(C.order(), C.upLo(), trans,
                   n, k,
                   alpha,
                   A.data(), A.leadingDimension(),
                   B.data(), B.leadingDimension(),
                   beta,
                   C.data(), C.leadingDimension());
#   else
    ASSERT(0);
#   endif
}

} } // namespace blas, flens

#endif // FLENS_BLAS_LEVEL3_R2K_TCC