copysum.tcc (flens/blas/closures/level1/copysum.tcc)

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/*
*   Copyright (c) 2007, 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_CLOSURES_LEVEL1_COPYSUM_TCC
#define FLENS_BLAS_CLOSURES_LEVEL1_COPYSUM_TCC 1

#include <flens/auxiliary/auxiliary.h>
#include <flens/blas/closures/closures.h>
#include <flens/blas/level1/level1.h>
#include <flens/blas/level2/level2.h>
#include <flens/blas/level3/level3.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 {

//
//== vector closures ===========================================================
//

//
// Auxiliary function for
//     y = x1 + x2  (alpha= 1)
// or  y = x1 - x2  (alpha=-1)
//
template <typename VX1, typename ALPHA, typename VX2, typename VY>
void
copySum(const VX1 &x1, const ALPHA &alpha, const VX2 &x2, VY &y)
{
    ASSERT(alpha==ALPHA(1) || alpha==ALPHA(-1));
//
//  In debug-closure-mode we check if x2 has to stored in a temporary.
//  Otherwise an assertion gets triggered if x2 and y are identical of if x2
//  is a closure that contains y.
//
#   ifdef FLENS_DEBUG_CLOSURES
    bool tmpNeeded = DebugClosure::search(x2, y);
    typename Result<VX2>::NoView tmp;

    if (tmpNeeded) {
        tmp = x2;
        FLENS_BLASLOG_TMP_ADD(tmp);
    }
#   else
    ASSERT(!DebugClosure::search(x2, y));
#   endif

//
//  y = x1
//
    if (! DEBUGCLOSURE::identical(x1, y)) {
        blas::copy(x1, y);
    }
//
//  y += x2  or  y -= x2
//
#   ifdef FLENS_DEBUG_CLOSURES
    if (tmpNeeded) {
        blas::axpy(alpha, tmp, y);
        FLENS_BLASLOG_TMP_REMOVE(tmp, x2);
    } else {
        blas::axpy(alpha, x2, y);
    }
#   else
    blas::axpy(alpha, x2, y);
#   endif
}

//
//== matrix closures ===========================================================
//

//
// Auxiliary function for
//     B = op(A1 + A2)  (alpha= 1)
// or  B = op(A1 - A2)  (alpha=-1)
//
template <typename MA1, typename ALPHA, typename MA2, typename MB>
void
copySum(Transpose trans,
    const MA1 &A1, const ALPHA &alpha, const MA2 &A2, MB &B)
{
    ASSERT(alpha==ALPHA(1) || alpha==ALPHA(-1));
//
//  In debug-closure-mode we check if A2 has to stored in a temporary.
//  Otherwise an assertion gets triggered if A2 and B are identical of if A2
//  is a closure that contains B.
//
#   ifdef FLENS_DEBUG_CLOSURES
    bool tmpNeeded = DebugClosure::search(A2, B);
    typename Result<MA2>::NoView tmp;

    if (tmpNeeded) {
        tmp = A2;
        FLENS_BLASLOG_TMP_ADD(tmp);
    }
#   else
    ASSERT(!DebugClosure::search(A2, B));
#   endif

//
//  B = A1
//
    if (! DEBUGCLOSURE::identical(A1, B)) {
        blas::copy(trans, A1, B);
    }
//
//  B += A2  or  B -= A2
//
#   ifdef FLENS_DEBUG_CLOSURES
    if (tmpNeeded) {
        blas::axpy(trans, alpha, tmp, B);
        FLENS_BLASLOG_TMP_REMOVE(tmp, A2);
    } else {
        blas::axpy(trans, alpha, A2, B);
    }
#   else
    blas::axpy(trans, alpha, A2, B);
#   endif

}

} } // namespace blas, flens

#endif // FLENS_BLAS_CLOSURES_LEVEL1_COPY_TCC