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bug #978: early return for vanishing products

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This commit is contained in:
Gael Guennebaud 2015-03-06 16:11:22 +01:00
parent 4c8eeeaed6
commit 87681e508f
1 changed files with 2 additions and 0 deletions
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Eigen/src/Core/products/GeneralMatrixMatrix.h
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@ -457,6 +457,8 @@ struct generic_product_impl<Lhs,Rhs,DenseShape,DenseShape,GemmProduct>
static void scaleAndAddTo(Dest& dst, const Lhs& a_lhs, const Rhs& a_rhs, const Scalar& alpha) static void scaleAndAddTo(Dest& dst, const Lhs& a_lhs, const Rhs& a_rhs, const Scalar& alpha)
{ {
eigen_assert(dst.rows()==a_lhs.rows() && dst.cols()==a_rhs.cols()); eigen_assert(dst.rows()==a_lhs.rows() && dst.cols()==a_rhs.cols());
if(a_lhs.cols()==0 || a_lhs.rows()==0 || a_rhs.cols()==0)
return;
typename internal::add_const_on_value_type<ActualLhsType>::type lhs = LhsBlasTraits::extract(a_lhs); typename internal::add_const_on_value_type<ActualLhsType>::type lhs = LhsBlasTraits::extract(a_lhs);
typename internal::add_const_on_value_type<ActualRhsType>::type rhs = RhsBlasTraits::extract(a_rhs); typename internal::add_const_on_value_type<ActualRhsType>::type rhs = RhsBlasTraits::extract(a_rhs);