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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra. Eigen itself is part of the KDE project.
//
// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr>
// Copyright (C) 2006-2008 Benoit Jacob <jacob@math.jussieu.fr>
//
// Eigen is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// Alternatively, you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// Eigen. If not, see <http://www.gnu.org/licenses/>.
#ifndef EIGEN_DIAGONALPRODUCT_H
#define EIGEN_DIAGONALPRODUCT_H
template<typename LhsNested, typename RhsNested>
struct ei_traits<Product<LhsNested, RhsNested, DiagonalProduct> >
{
// clean the nested types:
typedef typename ei_unconst<typename ei_unref<LhsNested>::type>::type _LhsNested;
typedef typename ei_unconst<typename ei_unref<RhsNested>::type>::type _RhsNested;
typedef typename _LhsNested::Scalar Scalar;
enum {
LhsFlags = _LhsNested::Flags,
RhsFlags = _RhsNested::Flags,
RowsAtCompileTime = _LhsNested::RowsAtCompileTime,
ColsAtCompileTime = _RhsNested::ColsAtCompileTime,
MaxRowsAtCompileTime = _LhsNested::MaxRowsAtCompileTime,
MaxColsAtCompileTime = _RhsNested::MaxColsAtCompileTime,
LhsIsDiagonal = (_LhsNested::Flags&Diagonal)==Diagonal,
RhsIsDiagonal = (_RhsNested::Flags&Diagonal)==Diagonal,
CanVectorizeRhs = (!RhsIsDiagonal) && (RhsFlags & RowMajorBit) && (RhsFlags & PacketAccessBit)
&& (ColsAtCompileTime % ei_packet_traits<Scalar>::size == 0),
CanVectorizeLhs = (!LhsIsDiagonal) && (!(LhsFlags & RowMajorBit)) && (LhsFlags & PacketAccessBit)
&& (RowsAtCompileTime % ei_packet_traits<Scalar>::size == 0),
RemovedBits = ~(((RhsFlags & RowMajorBit) && (!CanVectorizeLhs) ? 0 : RowMajorBit)
| ((RowsAtCompileTime == Dynamic || ColsAtCompileTime == Dynamic) ? 0 : LargeBit)),
Flags = ((unsigned int)(LhsFlags | RhsFlags) & HereditaryBits & RemovedBits)
| (CanVectorizeLhs || CanVectorizeRhs ? PacketAccessBit : 0),
CoeffReadCost = NumTraits<Scalar>::MulCost + _LhsNested::CoeffReadCost + _RhsNested::CoeffReadCost
};
};
template<typename LhsNested, typename RhsNested> class Product<LhsNested, RhsNested, DiagonalProduct> : ei_no_assignment_operator,
public MatrixBase<Product<LhsNested, RhsNested, DiagonalProduct> >
{
typedef typename ei_traits<Product>::_LhsNested _LhsNested;
typedef typename ei_traits<Product>::_RhsNested _RhsNested;
enum {
RhsIsDiagonal = (_RhsNested::Flags&Diagonal)==Diagonal
};
public:
EIGEN_GENERIC_PUBLIC_INTERFACE(Product)
template<typename Lhs, typename Rhs>
inline Product(const Lhs& lhs, const Rhs& rhs)
: m_lhs(lhs), m_rhs(rhs)
{
ei_assert(lhs.cols() == rhs.rows());
}
inline int rows() const { return m_lhs.rows(); }
inline int cols() const { return m_rhs.cols(); }
const Scalar coeff(int row, int col) const
{
const int unique = RhsIsDiagonal ? col : row;
return m_lhs.coeff(row, unique) * m_rhs.coeff(unique, col);
}
template<int LoadMode>
const PacketScalar packet(int row, int col) const
{
if (RhsIsDiagonal)
{
ei_assert((_LhsNested::Flags&RowMajorBit)==0);
return ei_pmul(m_lhs.template packet<LoadMode>(row, col), ei_pset1(m_rhs.coeff(col, col)));
}
else
{
ei_assert(_RhsNested::Flags&RowMajorBit);
return ei_pmul(ei_pset1(m_lhs.coeff(row, row)), m_rhs.template packet<LoadMode>(row, col));
}
}
protected:
const LhsNested m_lhs;
const RhsNested m_rhs;
};
#endif // EIGEN_DIAGONALPRODUCT_H
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