KOKKOS_INLINE_FUNCTION
  int
  Chol<Uplo::Upper,
       AlgoChol::ExternalLapack,Variant::One>
  ::invoke(PolicyType &policy,
           const MemberType &member,
           DenseExecViewTypeA &A) {
    // static_assert( Kokkos::Impl::is_same<
    //                typename DenseMatrixTypeA::space_type,
    //                Kokkos::Cuda
    //                >::value,
    //                "Cuda space is not available for calling external BLAS" );

    //typedef typename DenseExecViewTypeA::space_type   space_type;
    typedef typename DenseExecViewTypeA::ordinal_type ordinal_type;
    typedef typename DenseExecViewTypeA::value_type   value_type;

    int r_val = 0;      
    if (member.team_rank() == 0) {
#ifdef HAVE_SHYLUTACHO_TEUCHOS
      Teuchos::LAPACK<ordinal_type,value_type> lapack;

      lapack.POTRF('U',
                   A.NumRows(),
                   A.ValuePtr(), A.BaseObject().ColStride(),
                   &r_val);
#else
    TACHO_TEST_FOR_ABORT( true, MSG_NOT_HAVE_PACKAGE("Teuchos") );
#endif
    }

    return r_val;
  }
  KOKKOS_INLINE_FUNCTION
  int
  Gemm<Trans::ConjTranspose,Trans::NoTranspose,
       AlgoGemm::ExternalBlas,Variant::One>
  ::invoke(PolicyType &policy,
           MemberType &member,
           const ScalarType alpha,
           DenseExecViewTypeA &A,
           DenseExecViewTypeB &B,
           const ScalarType beta,
           DenseExecViewTypeC &C) {
    // static_assert( Kokkos::Impl::is_same<
    //                typename DenseMatrixTypeA::space_type,
    //                typename DenseMatrixTypeB::space_type
    //                >::value && 
    //                Kokkos::Impl::is_same<
    //                typename DenseMatrixTypeB::space_type,
    //                typename DenseMatrixTypeC::space_type
    //                >::value,
    //                "Space type of input matrices does not match" );
    
    if (member.team_rank() == 0) {
#if                                                     \
  defined( HAVE_SHYLUTACHO_TEUCHOS ) &&                 \
  defined( KOKKOS_ACTIVE_EXECUTION_MEMORY_SPACE_HOST )
      typedef typename DenseExecViewTypeA::ordinal_type ordinal_type;
      typedef typename DenseExecViewTypeA::value_type   value_type;

      Teuchos::BLAS<ordinal_type,value_type> blas;
      
      const ordinal_type m = C.NumRows();
      const ordinal_type n = C.NumCols();
      const ordinal_type k = B.NumRows();

      if (m > 0 && n > 0 && k > 0)
        blas.GEMM(Teuchos::CONJ_TRANS, Teuchos::NO_TRANS,
                  m, n, k,
                  alpha,
                  A.ValuePtr(), A.BaseObject().ColStride(),
                  B.ValuePtr(), B.BaseObject().ColStride(),
                  beta,
                  C.ValuePtr(), C.BaseObject().ColStride());
#else
    TACHO_TEST_FOR_ABORT( true, MSG_NOT_HAVE_PACKAGE("Teuchos") );        
#endif
    } 

    return 0;
  }
  KOKKOS_INLINE_FUNCTION
  int
  Trsm<Side::Left,Uplo::Upper,Trans::NoTranspose,
       AlgoTrsm::ExternalBlas,Variant::One>
  ::invoke(PolicyType &policy,
           const MemberType &member,
           const int diagA,
           const ScalarType alpha,
           DenseExecViewTypeA &A,
           DenseExecViewTypeB &B) {
    // static_assert( Kokkos::Impl::is_same<
    //                typename DenseMatrixTypeA::space_type,
    //                Kokkos::Cuda
    //                >::value,
    //                "Cuda space is not available for calling external BLAS" );

    // static_assert( Kokkos::Impl::is_same<
    //                typename DenseMatrixTypeA::space_type,
    //                typename DenseMatrixTypeB::space_type
    //                >::value,
    //                "Space type of input matrices does not match" );

    //typedef typename DenseExecViewTypeA::space_type   space_type;
    typedef typename DenseExecViewTypeA::ordinal_type ordinal_type;
    typedef typename DenseExecViewTypeA::value_type   value_type;

    if (member.team_rank() == 0) {
#ifdef HAVE_SHYLUTACHO_TEUCHOS
      Teuchos::BLAS<ordinal_type,value_type> blas;

      const ordinal_type m = A.NumRows();
      const ordinal_type n = B.NumCols();

      blas.TRSM(Teuchos::LEFT_SIDE, Teuchos::UPPER_TRI, Teuchos::NO_TRANS,
                (diagA == Diag::Unit ? Teuchos::UNIT_DIAG : Teuchos::NON_UNIT_DIAG),
                m, n,
                alpha,
                A.ValuePtr(), A.BaseObject().ColStride(),
                B.ValuePtr(), B.BaseObject().ColStride());
#else
    TACHO_TEST_FOR_ABORT( true, MSG_NOT_HAVE_PACKAGE("Teuchos") );
#endif
    }

    return 0;
  }