raxpy.tcc (flens/blas/level1/raxpy.tcc)

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/*
*   Copyright (c) 2012, 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_LEVEL1_RAXPY_TCC
#define FLENS_BLAS_LEVEL1_RAXPY_TCC 1

#include <cxxblas/cxxblas.h>
#include <flens/auxiliary/auxiliary.h>
#include <flens/blas/closures/closures.h>
#include <flens/blas/level1/level1.h>
#include <flens/typedefs.h>

#ifdef FLENS_DEBUG_CLOSURES
#   include <flens/blas/blaslogon.h>
#else
#   include <flens/blas/blaslogoff.h>
#endif

namespace flens { namespace blas {

//-- raxpy
template <typename ALPHA, typename VX, typename VY>
typename RestrictTo<IsDenseVector<VX>::value
                 && IsDenseVector<VY>::value,
         void>::Type
raxpy(const ALPHA &alpha, const VX &x, VY &&y)
{
    FLENS_BLASLOG_SETTAG("--> ");
    FLENS_BLASLOG_BEGIN_RAXPY(alpha, x, y);

    if (y.length()==0) {
//
//      So we allow  y += 1/alpha*x  for an empty vector y
//
        typedef typename RemoveRef<VY>::Type   VectorY;
        typedef typename VectorY::ElementType  T;
        const T  Zero(0);

        y.resize(x, Zero);
    }
    ASSERT(y.length()==x.length());

#   ifdef HAVE_CXXBLAS_RAXPY
    cxxblas::raxpy(x.length(), alpha,
                   x.data(), x.stride(),
                   y.data(), y.stride());
#   else
    ASSERT(0);
#   endif
    FLENS_BLASLOG_END;
    FLENS_BLASLOG_UNSETTAG;
}

//-- geraxpy
//
//  B += A/alpha
//
template <typename ALPHA, typename MA, typename MB>
typename RestrictTo<IsGeMatrix<MA>::value
                 && IsGeMatrix<MB>::value,
         void>::Type
raxpy(Transpose trans, const ALPHA &alpha, const MA &A, MB &&B)
{
    typedef typename RemoveRef<MA>::Type MatrixA;
    typedef typename RemoveRef<MB>::Type MatrixB;

    if (B.numRows()==0 || B.numCols()==0) {
//
//      So we allow  B += 1/alpha*A  for an empty matrix B
//
        typedef typename RemoveRef<MB>::Type   MatrixB;
        typedef typename MatrixB::ElementType  T;
        const T  Zero(0);

        if ((trans==NoTrans) || (trans==Conj)) {
            B.resize(A.numRows(), A.numCols(), Zero);
        } else {
            B.resize(A.numCols(), A.numRows(), Zero);
        }
    }

#   ifndef NDEBUG
    if ((trans==NoTrans) || (trans==Conj)) {
        ASSERT((A.numRows()==B.numRows()) && (A.numCols()==B.numCols()));
    } else {
        ASSERT((A.numRows()==B.numCols()) && (A.numCols()==B.numRows()));
    }
#   endif

    trans = (A.order()==B.order())
          ? Transpose(trans ^ NoTrans)
          : Transpose(trans ^ Trans);

#   ifndef FLENS_DEBUG_CLOSURES
#   ifndef NDEBUG
    if (trans==Trans || trans==ConjTrans) {
        ASSERT(!DEBUGCLOSURE::identical(A, B));
    }
#   endif
#   else
//
//  If A and B are identical a temporary is needed if we want to use axpy
//  for B += A^T/alpha or B+= A^H/alpha
//
    if ((trans==Trans || trans==ConjTrans) && DEBUGCLOSURE::identical(A, B)) {
        typedef typename RemoveRef<MA>::Type  MatrixA;

        typename Result<MatrixA>::Type _A = A;
        FLENS_BLASLOG_TMP_ADD(_A);

        axpy(trans, alpha, _A, B);

        FLENS_BLASLOG_TMP_REMOVE(_A, A);
        return;
    }
#   endif

    FLENS_BLASLOG_SETTAG("--> ");
    FLENS_BLASLOG_BEGIN_MRAXPY(trans, alpha, A, B);

#   ifdef HAVE_CXXBLAS_GERAXPY
    geraxpy(B.order(), trans, B.numRows(), B.numCols(), alpha,
            A.data(), A.leadingDimension(),
            B.data(), B.leadingDimension());
#   else
    ASSERT(0);
#   endif
    FLENS_BLASLOG_END;
    FLENS_BLASLOG_UNSETTAG;
}

} } // namespace blas, flens

#endif // FLENS_BLAS_LEVEL1_RAXPY_TCC