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Implement interface for NoAlias assignments.

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* Rename the old copy_using_evaluators to noalias_copy_using_evaluators.
* Write a new copy_using_evaluators which strips NoAlias expression, if present,
  and calls noalias_copy_using_evaluators; in future, it will also take care of
  aliasing in products.
* Add expression() getter to NoAlias.
This commit is contained in:
Jitse Niesen 2012-06-29 13:24:04 +01:00
parent 069fd0e4be
commit c1eb820e50
3 changed files with 23 additions and 2 deletions
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19
Eigen/src/Core/AssignEvaluator.h
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@ -605,9 +605,24 @@ struct copy_using_evaluator_impl<DstXprType, SrcXprType, SliceVectorizedTraversa
// Based on DenseBase::LazyAssign()
template<typename DstXprType, template <typename> class StorageBase, typename SrcXprType>
EIGEN_STRONG_INLINE
const DstXprType& copy_using_evaluator(const NoAlias<DstXprType, StorageBase>& dst,
const EigenBase<SrcXprType>& src)
{
return noalias_copy_using_evaluator(dst.expression(), src.derived());
}
template<typename DstXprType, typename SrcXprType>
EIGEN_STRONG_INLINE
const DstXprType& copy_using_evaluator(const PlainObjectBase<DstXprType>& dst, const EigenBase<SrcXprType>& src)
const DstXprType& copy_using_evaluator(const EigenBase<DstXprType>& dst, const EigenBase<SrcXprType>& src)
{
return noalias_copy_using_evaluator(dst.const_cast_derived(), src.derived());
}
template<typename DstXprType, typename SrcXprType>
EIGEN_STRONG_INLINE
const DstXprType& noalias_copy_using_evaluator(const PlainObjectBase<DstXprType>& dst, const EigenBase<SrcXprType>& src)
{
#ifdef EIGEN_DEBUG_ASSIGN
internal::copy_using_evaluator_traits<DstXprType, SrcXprType>::debug();
@ -624,7 +639,7 @@ const DstXprType& copy_using_evaluator(const PlainObjectBase<DstXprType>& dst, c
template<typename DstXprType, typename SrcXprType>
EIGEN_STRONG_INLINE
const DstXprType& copy_using_evaluator(const EigenBase<DstXprType>& dst, const EigenBase<SrcXprType>& src)
const DstXprType& noalias_copy_using_evaluator(const EigenBase<DstXprType>& dst, const EigenBase<SrcXprType>& src)
{
return copy_using_evaluator_without_resizing(dst.const_cast_derived(), src.derived());
}

5
Eigen/src/Core/NoAlias.h
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@ -97,6 +97,11 @@ class NoAlias
{ return m_expression.derived() -= CoeffBasedProduct<Lhs,Rhs,NestByRefBit>(other.lhs(), other.rhs()); }
#endif
ExpressionType& expression() const
{
return m_expression;
}
protected:
ExpressionType& m_expression;
};

1
test/evaluators.cpp
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@ -60,6 +60,7 @@ void test_evaluators()
VERIFY_IS_APPROX_EVALUATOR(d, (a + b));
VERIFY_IS_APPROX_EVALUATOR(d, (a + b).transpose());
VERIFY_IS_APPROX_EVALUATOR2(d, prod(a,b), a*b);
VERIFY_IS_APPROX_EVALUATOR2(d.noalias(), prod(a,b), a*b);
VERIFY_IS_APPROX_EVALUATOR2(d, prod(a,b) + c, a*b + c);
VERIFY_IS_APPROX_EVALUATOR2(d, s * prod(a,b), s * a*b);
VERIFY_IS_APPROX_EVALUATOR2(d, prod(a,b).transpose(), (a*b).transpose());