Tpetra_LocalCrsMatrixOperator_def.hpp

// @HEADER
// ***********************************************************************
//
//          Tpetra: Templated Linear Algebra Services Package
//                 Copyright (2008) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// 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 Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "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 SANDIA CORPORATION OR THE
// 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.
//
// ************************************************************************
// @HEADER

#ifndef TPETRA_LOCALCRSMATRIXOPERATOR_DEF_HPP
#define TPETRA_LOCALCRSMATRIXOPERATOR_DEF_HPP

#include "Tpetra_LocalOperator.hpp"
#include "KokkosSparse.hpp"
#include "Teuchos_TestForException.hpp"

namespace Tpetra {

template<class MultiVectorScalar, class MatrixScalar, class Device>
LocalCrsMatrixOperator<MultiVectorScalar, MatrixScalar, Device>::
LocalCrsMatrixOperator (const std::shared_ptr<local_matrix_type>& A)
  : A_ (A)
{
  const char tfecfFuncName[] = "LocalCrsMatrixOperator: ";
  TEUCHOS_TEST_FOR_EXCEPTION_CLASS_FUNC
    (A_.get () == nullptr, std::invalid_argument,
     "Input matrix A is null.");
}

template<class MultiVectorScalar, class MatrixScalar, class Device>
bool
LocalCrsMatrixOperator<MultiVectorScalar, MatrixScalar, Device>::
hasTransposeApply () const
{
  return true;
}

template<class MultiVectorScalar, class MatrixScalar, class Device>
void
LocalCrsMatrixOperator<MultiVectorScalar, MatrixScalar, Device>::
apply (Kokkos::View<const mv_scalar_type**, array_layout,
         device_type, Kokkos::MemoryTraits<Kokkos::Unmanaged> > X,
       Kokkos::View<mv_scalar_type**, array_layout,
         device_type, Kokkos::MemoryTraits<Kokkos::Unmanaged> > Y,
       const Teuchos::ETransp mode,
       const mv_scalar_type alpha,
       const mv_scalar_type beta) const
{
  const bool conjugate = (mode == Teuchos::CONJ_TRANS);
  const bool transpose = (mode != Teuchos::NO_TRANS);

#ifdef HAVE_TPETRA_DEBUG
  const char tfecfFuncName[] = "apply: ";

  TEUCHOS_TEST_FOR_EXCEPTION_CLASS_FUNC
    (X.extent (1) != Y.extent (1), std::runtime_error,
     "X.extent(1) = " << X.extent (1) << " != Y.extent(1) = "
     << Y.extent (1) << ".");
  // If the two pointers are NULL, then they don't alias one
  // another, even though they are equal.
  TEUCHOS_TEST_FOR_EXCEPTION_CLASS_FUNC
    (X.data () == Y.data () && X.data () != nullptr,
     std::runtime_error, "X and Y may not alias one another.");
#endif // HAVE_TPETRA_DEBUG

  const auto op = transpose ?
    (conjugate ? KokkosSparse::ConjugateTranspose :
     KokkosSparse::Transpose) : KokkosSparse::NoTranspose;
  KokkosSparse::spmv (op, alpha, *A_, X, beta, Y);
}

template<class MultiVectorScalar, class MatrixScalar, class Device>
const typename LocalCrsMatrixOperator<MultiVectorScalar, MatrixScalar, Device>::local_matrix_type&
LocalCrsMatrixOperator<MultiVectorScalar, MatrixScalar, Device>::
getLocalMatrix () const
{
  return *A_;
}

} // namespace Tpetra

//
// Explicit instantiation macro
//
// Must be expanded from within the Tpetra namespace!
//

// We only explicitly instantiate for MultiVectorScalar ==
// MatrixScalar, which is what CrsMatrix needs.

#define TPETRA_LOCALCRSMATRIXOPERATOR_INSTANT(SC,NT) \
  template class LocalCrsMatrixOperator< SC, SC, NT::device_type >;

#endif // TPETRA_LOCALCRSMATRIXOPERATOR_DEF_HPP