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Fallback to lazy products for very small ones.

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This commit is contained in:
Gael Guennebaud 2014-04-16 23:15:42 +02:00
parent de8336a9bc
commit d936ddc3d1
1 changed files with 30 additions and 0 deletions
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30
Eigen/src/Core/products/GeneralMatrixMatrix.h
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@ -387,6 +387,36 @@ class GeneralProduct<Lhs, Rhs, GemmProduct>
EIGEN_CHECK_BINARY_COMPATIBILIY(BinOp,LhsScalar,RhsScalar);
}
template<typename Dest>
inline void evalTo(Dest& dst) const
{
if((m_rhs.rows()+dst.rows()+dst.cols())<20)
dst.noalias() = m_lhs .lazyProduct( m_rhs );
else
{
dst.setZero();
scaleAndAddTo(dst,Scalar(1));
}
}
template<typename Dest>
inline void addTo(Dest& dst) const
{
if((m_rhs.rows()+dst.rows()+dst.cols())<20)
dst.noalias() += m_lhs .lazyProduct( m_rhs );
else
scaleAndAddTo(dst,Scalar(1));
}
template<typename Dest>
inline void subTo(Dest& dst) const
{
if((m_rhs.rows()+dst.rows()+dst.cols())<20)
dst.noalias() -= m_lhs .lazyProduct( m_rhs );
else
scaleAndAddTo(dst,Scalar(-1));
}
template<typename Dest> void scaleAndAddTo(Dest& dst, const Scalar& alpha) const
{
eigen_assert(dst.rows()==m_lhs.rows() && dst.cols()==m_rhs.cols());