DiagonalPreconditioner.C

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    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
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#include "DiagonalPreconditioner.H"

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

template<class Type, class DType, class LUType>
Foam::DiagonalPreconditioner<Type, DType, LUType>::DiagonalPreconditioner
(
    const typename LduMatrix<Type, DType, LUType>::solver& sol,
    const dictionary&
)
:
    LduMatrix<Type, DType, LUType>::preconditioner(sol),
    rD(sol.matrix().diag().size())
{
    DType* __restrict__ rDPtr = rD.begin();
    const DType* __restrict__ DPtr = this->solver_.matrix().diag().begin();

    label nCells = rD.size();

    // Generate inverse (reciprocal for scalar) diagonal
    for (label cell=0; cell<nCells; cell++)
    {
        rDPtr[cell] = inv(DPtr[cell]);
    }
}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

template<class Type, class DType, class LUType>
void Foam::DiagonalPreconditioner<Type, DType, LUType>::read(const dictionary&)
{}


template<class Type, class DType, class LUType>
void Foam::DiagonalPreconditioner<Type, DType, LUType>::precondition
(
    Field<Type>& wA,
    const Field<Type>& rA
) const
{
    Type* __restrict__ wAPtr = wA.begin();
    const Type* __restrict__ rAPtr = rA.begin();
    const DType* __restrict__ rDPtr = rD.begin();

    label nCells = wA.size();

    for (label cell=0; cell<nCells; cell++)
    {
        wAPtr[cell] = dot(rDPtr[cell], rAPtr[cell]);
    }
}


// ************************************************************************* //