trcopy.tcc (cxxblas/level1extensions/trcopy.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 CXXBLAS_LEVEL1EXTENSIONS_TRCOPY_TCC
#define CXXBLAS_LEVEL1EXTENSIONS_TRCOPY_TCC 1

#include <algorithm>
#include <cassert>
#include <cxxblas/cxxblas.h>

namespace cxxblas {

//
//  B = A  or B = A^T
//
template <typename IndexType, typename MA, typename MB>
void
trcopy(StorageOrder order, StorageUpLo upLo, Transpose trans, Diag diag,
       IndexType m, IndexType n, const MA *A, IndexType ldA,
       MB *B, IndexType ldB)
{
    CXXBLAS_DEBUG_OUT("trcopy_generic");
    using std::min;

    // TODO: implement complex cases  B = conj(A) and B = A^H
    ASSERT(trans==NoTrans || trans==Trans);

    if (order==RowMajor) {
        ASSERT(0);
    }
    if (diag==NonUnit) {
        if (trans==NoTrans) {
            if (upLo==Upper) {
                for (IndexType j=0; j<n; ++j) {
                    copy(min(j+1,m), A+j*ldA, IndexType(1),
                                     B+j*ldB, IndexType(1));
                }
            } else {
                for (IndexType j=0; j<min(m,n); ++j) {
                    copy(m-j, A+j*(ldA+1), IndexType(1),
                              B+j*(ldB+1), IndexType(1));
                }
            }
        } else if (trans==Trans) {
            if (upLo==Upper) {
                for (IndexType j=0; j<n; ++j) {
                    copy(min(j+1,m), A+j, ldA,
                                     B+j*ldB, IndexType(1));
                }
            } else {
                for (IndexType j=0; j<min(m,n); ++j) {
                    copy(m-j, A+j*(ldA+1), ldA,
                              B+j*(ldB+1), IndexType(1));
                }
            }
        } else {
            // TODO: implement this case
            ASSERT(0);
        }
    } else {
        if (trans==NoTrans) {
            if (upLo==Upper) {
                for (IndexType j=0; j<n; ++j) {
                    copy(min(j,m), A+j*ldA, IndexType(1),
                                   B+j*ldB, IndexType(1));
                }
            } else {
                for (IndexType j=0; j<min(m,n); ++j) {
                    copy(m-j-1, A+j*(ldA+1)+1, IndexType(1),
                                B+j*(ldB+1)+1, IndexType(1));
                }
            }
        } else {
            // TODO: implement this case
            ASSERT(0);
        }
    }
}

} // namespace cxxblas

#endif // CXXBLAS_LEVEL1EXTENSIONS_TRCOPY_TCC