rk.tcc (flens/blas/level3/rk.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_RK_TCC
#define FLENS_BLAS_LEVEL3_RK_TCC

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

namespace flens { namespace blas {

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

    ASSERT(C.order()==A.order());
    typedef typename MatrixC::IndexType IndexType;

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

    ASSERT((beta==static_cast<BETA>(0)) || (C.dim()==n));
    if (C.dim()!=n) {
        C.resize(n, n);
    }

    ASSERT(C.dim()==((trans==NoTrans) ? A.numRows() : A.numCols()));

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

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

    ASSERT(C.order()==A.order());

    typedef typename MatrixC::IndexType IndexType;

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

    ASSERT((beta==static_cast<BETA>(0)) || (C.dim()==n));
    if (C.dim()!=n) {
        C.resize(n, n);
    }

    ASSERT(C.dim()==((trans==NoTrans) ? A.numRows() : A.numCols()));

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

} } // namespace blas, flens

#endif // FLENS_BLAS_LEVEL3_RK_TCC