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/*
 *   Copyright (c) 2012, Michael Lehn, Klaus Pototzky
 *
 *   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.
 */

/* Based on
 *
       SUBROUTINE ZHPSV( UPLO, N, NRHS, AP, IPIV, B, LDB, INFO )
 *
 *  -- LAPACK driver routine (version 3.2) --
 *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
 *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
 *     November 2006
 */

#ifndef FLENS_LAPACK_HP_SV_TCC
#define FLENS_LAPACK_HP_SV_TCC 1

#include <flens/blas/blas.h>
#include <flens/lapack/lapack.h>

namespace flens { namespace lapack {


//== interface for native lapack ===============================================

#ifdef USE_CXXLAPACK

namespace external {

//-- (hp)sv [complex variant] --------------------------------------------------

template <typename MA, typename VPIV, typename MB>
typename HpMatrix<MA>::IndexType
sv_impl(HpMatrix<MA> &A, DenseVector<VPIV> &piv, GeMatrix<MB> &B)
{
    typedef typename HpMatrix<MA>::IndexType  IndexType;

    IndexType info = cxxlapack::hpsv<IndexType>(getF77Char(A.upLo()),
                                                A.dim(),
                                                B.numCols(),
                                                A.data(),
                                                piv.data(),
                                                B.data(),
                                                B.leadingDimension());
    ASSERT(info>=0);
    return info;
}

// namespace external


//== public interface ==========================================================

//-- (hp)sv [complex variant] --------------------------------------------------

template <typename MA, typename VPIV, typename MB>
typename RestrictTo<IsHpMatrix<MA>::value
                 && IsIntegerDenseVector<VPIV>::value
                 && IsComplexGeMatrix<MB>::value,
         typename RemoveRef<MA>::Type::IndexType>::Type
sv(MA &&A, VPIV &&piv, MB &&B)
{
    LAPACK_DEBUG_OUT("(hp)sv [complex]");

//
//  Remove references from rvalue types
//
    typedef typename RemoveRef<MA>::Type    MatrixA;
    typedef typename MatrixA::IndexType     IndexType;

    if (piv.length()==0) {
        piv.resize(A.dim());
    }
    ASSERT(piv.length()==A.dim());

//
//  Test the input parameters
//
#   ifndef NDEBUG
    ASSERT(A.firstIndex()==1);
    ASSERT(piv.stride()==0);
    ASSERT(B.firstRow()==1);
    ASSERT(B.firstCol()==1);
    ASSERT(B.numRows()==A.dim());
#   endif
//
//  Call implementation
//
    IndexType info = external::sv_impl(A, piv, B);

    return info;
}

//-- (hp)sv [complex variant, if rhs is vector] --------------------------------

template <typename MA, typename VPIV, typename VB>
typename RestrictTo<IsHpMatrix<MA>::value
                 && IsIntegerDenseVector<VPIV>::value
                 && IsComplexDenseVector<VB>::value,
          typename RemoveRef<MA>::Type::IndexType>::Type
sv(MA &&A, VPIV &&piv, VB &&b)
{
//
//  Remove references from rvalue types
//
    typedef typename RemoveRef<MA>::Type    MatrixA;
    typedef typename RemoveRef<VB>::Type    VectorB;

    typedef typename VectorB::ElementType  ElementType;
    typedef typename VectorB::IndexType    IndexType;

    const IndexType    n     = b.length();
    const StorageOrder order = MatrixA::Engine::order;

    GeMatrix<FullStorageView<ElementType, order> >  B(n1, b, n);

    return sv(A, piv, B);
}

#endif // USE_CXXLAPACK


} } // namespace lapack, flens

#endif // FLENS_LAPACK_HP_SV_TCC