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/*
* Copyright (c) 2011, 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.
*/
/*
SUBROUTINE DLASWP( N, A, LDA, K1, K2, IPIV, INCX )
*
* -- LAPACK auxiliary 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_LA_LASWP_TCC
#define FLENS_LAPACK_LA_LASWP_TCC 1
#include <flens/blas/blas.h>
#include <flens/lapack/lapack.h>
namespace flens { namespace lapack {
//== generic lapack implementation =============================================
namespace generic {
template <typename MA, typename VP>
void
laswp_impl(GeMatrix<MA> &A, const DenseVector<VP> &piv)
{
typedef typename GeMatrix<MA>::IndexType IndexType;
typedef Range<IndexType> Range;
const IndexType n = A.numCols();
//
// Interchange row i with row piv(i) for each of rows K1 through K2.
//
const IndexType pBeg = piv.firstIndex();
const IndexType pEnd = piv.endIndex();
const IndexType pInc = piv.inc();
const IndexType bs = 32;
const IndexType nbs = (n/bs)*bs;
if (nbs!=0) {
for (IndexType j=1; j<=nbs; j+=bs) {
const Range cols(j,j+bs-1);
for (IndexType i=pBeg; i!=pEnd; i+=pInc) {
const IndexType iP = piv(i);
if (iP!=i) {
blas::swap(A(i, cols), A(iP, cols));
}
}
}
}
if (nbs!=n) {
const Range cols(nbs+1,n);
for (IndexType i=pBeg; i!=pEnd; i+=pInc) {
const IndexType iP = piv(i);
if (iP!=i) {
blas::swap(A(i, cols), A(iP, cols));
}
}
}
}
} // namespace generic
//== interface for native lapack ===============================================
#ifdef USE_CXXLAPACK
namespace external {
template <typename MA, typename VP>
void
laswp_impl(GeMatrix<MA> &A, const DenseVector<VP> &piv)
{
using std::max;
using std::min;
typedef typename GeMatrix<MA>::IndexType IndexType;
const IndexType k1 = min(piv.firstIndex(), piv.lastIndex());
const IndexType k2 = max(piv.firstIndex(), piv.lastIndex());
cxxlapack::laswp<IndexType>(A.numCols(), A.data(), A.leadingDimension(),
k1, k2,
piv.data()-k1+1, piv.inc());
}
} // namespace external
#endif // USE_CXXLAPACK
//== public interface ==========================================================
template <typename MA, typename VP>
typename RestrictTo<IsGeMatrix<MA>::value
&& IsDenseVector<VP>::value,
void>::Type
laswp(MA &&A, const VP &piv)
{
//
// Remove references from rvalue types
//
# ifdef CHECK_CXXLAPACK
typedef typename RemoveRef<MA>::Type MatrixA;
# endif
//
// Test the input parameters
//
ASSERT(A.firstRow()==1);
ASSERT(A.firstCol()==1);
ASSERT((piv.inc()>0 && piv.firstIndex()>=A.firstRow())
|| (piv.inc()<0 && piv.firstIndex()<=A.numRows()));
ASSERT((piv.inc()>0 && piv.lastIndex()<=A.numRows())
|| (piv.inc()<0 && piv.lastIndex()>=A.firstRow()));
# ifdef CHECK_CXXLAPACK
//
// Make copies of output arguments
//
typename MatrixA::NoView org_A = A;
typename MatrixA::NoView A_ = A;
# endif
//
// Call implementation
//
LAPACK_SELECT::laswp_impl(A, piv);
# ifdef CHECK_CXXLAPACK
//
// Compare results
//
external::laswp_impl(A_, piv);
bool failed = false;
if (! isIdentical(A, A_, " A", "A_")) {
std::cerr << "CXXLAPACK: A = " << A << std::endl;
std::cerr << "F77LAPACK: A_ = " << A_ << std::endl;
failed = true;
}
if (failed) {
std::cerr << "piv.firstIndex() = " << piv.firstIndex() << std::endl;
std::cerr << "piv.lastIndex() = " << piv.lastIndex() << std::endl;
std::cerr << "piv.inc() = " << piv.inc() << std::endl;
std::cerr << "piv = " << piv << std::endl;
std::cerr << "org_A = " << org_A << std::endl;
ASSERT(0);
}
# endif
}
template <typename VA, typename VP>
typename RestrictTo<IsDenseVector<VA>::value
&& IsDenseVector<VP>::value,
void>::Type
laswp(VA &&a, const VP &piv)
{
//
// Remove references from rvalue types
//
typedef typename RemoveRef<VA>::Type VectorA;
typedef typename VectorA::ElementType ElementType;
typedef typename VectorA::IndexType IndexType;
const IndexType n = a.length();
GeMatrix<FullStorageView<ElementType, ColMajor> > A(n, 1, a);
laswp(A, piv);
}
} } // namespace lapack, flens
#endif // FLENS_LAPACK_LA_LASWP_TCC
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