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Add direct assignment of products

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This commit is contained in:
Gael Guennebaud 2013-12-02 16:37:58 +01:00
parent 7f917807c6
commit 34ca81b1bf
3 changed files with 56 additions and 4 deletions
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5
Eigen/src/Core/AssignEvaluator.h
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@ -679,6 +679,11 @@ void call_assignment(const NoAlias<Dst,StorageBase>& dst, const Src& src, const
{
Assignment<Dst,Src,Func>::run(dst.expression(), src, func);
}
template<typename Dst, template <typename> class StorageBase, typename Src, typename Func>
void call_assignment(NoAlias<Dst,StorageBase>& dst, const Src& src, const Func& func)
{
Assignment<Dst,Src,Func>::run(dst.expression(), src, func);
}
// Generic Dense to Dense assignment
template< typename DstXprType, typename SrcXprType, typename Functor, typename Scalar>

40
Eigen/src/Core/ProductEvaluators.h
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@ -45,6 +45,12 @@ struct evaluator<Product<Lhs, Rhs, Options> >
template<typename Lhs, typename Rhs, int ProductType = internal::product_type<Lhs,Rhs>::value>
struct dense_product_impl;
template<typename Lhs, typename Rhs>
struct evaluator_traits<Product<Lhs, Rhs, DefaultProduct> >
: evaluator_traits_base<Product<Lhs, Rhs, DefaultProduct> >
{
enum { AssumeAliasing = 1 };
};
// The evaluator for default dense products creates a temporary and call dense_product_impl
template<typename Lhs, typename Rhs, int ProductTag>
@ -58,9 +64,7 @@ struct product_evaluator<Product<Lhs, Rhs, DefaultProduct>, ProductTag, DenseSha
product_evaluator(const XprType& xpr)
: m_result(xpr.rows(), xpr.cols())
{
::new (static_cast<Base*>(this)) Base(m_result);
dense_product_impl<Lhs, Rhs>::evalTo(m_result, xpr.lhs(), xpr.rhs());
}
@ -68,6 +72,38 @@ protected:
PlainObject m_result;
};
// Dense = Product
template< typename DstXprType, typename Lhs, typename Rhs, typename Scalar>
struct Assignment<DstXprType, Product<Lhs,Rhs,DefaultProduct>, internal::assign_op<Scalar>, Dense2Dense, Scalar>
{
typedef Product<Lhs,Rhs,DefaultProduct> SrcXprType;
static void run(DstXprType &dst, const SrcXprType &src, const internal::assign_op<Scalar> &)
{
dense_product_impl<Lhs, Rhs>::evalTo(dst, src.lhs(), src.rhs());
}
};
// Dense += Product
template< typename DstXprType, typename Lhs, typename Rhs, typename Scalar>
struct Assignment<DstXprType, Product<Lhs,Rhs,DefaultProduct>, internal::add_assign_op<Scalar>, Dense2Dense, Scalar>
{
typedef Product<Lhs,Rhs,DefaultProduct> SrcXprType;
static void run(DstXprType &dst, const SrcXprType &src, const internal::add_assign_op<Scalar> &)
{
dense_product_impl<Lhs, Rhs>::addTo(dst, src.lhs(), src.rhs());
}
};
// Dense -= Product
template< typename DstXprType, typename Lhs, typename Rhs, typename Scalar>
struct Assignment<DstXprType, Product<Lhs,Rhs,DefaultProduct>, internal::sub_assign_op<Scalar>, Dense2Dense, Scalar>
{
typedef Product<Lhs,Rhs,DefaultProduct> SrcXprType;
static void run(DstXprType &dst, const SrcXprType &src, const internal::sub_assign_op<Scalar> &)
{
dense_product_impl<Lhs, Rhs>::subTo(dst, src.lhs(), src.rhs());
}
};
template<typename Lhs, typename Rhs>
struct dense_product_impl<Lhs,Rhs,InnerProduct>

15
test/evaluators.cpp
View File

@ -47,14 +47,14 @@ namespace Eigen {
void add_assign_using_evaluator(const DstXprType& dst, const SrcXprType& src)
{
typedef typename DstXprType::Scalar Scalar;
call_assignment(dst.const_cast_derived(), src.derived(), internal::add_assign_op<Scalar>());
call_assignment(const_cast<DstXprType&>(dst), src.derived(), internal::add_assign_op<Scalar>());
}
template<typename DstXprType, typename SrcXprType>
void subtract_assign_using_evaluator(const DstXprType& dst, const SrcXprType& src)
{
typedef typename DstXprType::Scalar Scalar;
call_assignment(dst.const_cast_derived(), src.derived(), internal::sub_assign_op<Scalar>());
call_assignment(const_cast<DstXprType&>(dst), src.derived(), internal::sub_assign_op<Scalar>());
}
template<typename DstXprType, typename SrcXprType>
@ -151,6 +151,17 @@ void test_evaluators()
c = a*a;
copy_using_evaluator(a, prod(a,a));
VERIFY_IS_APPROX(a,c);
// check compound assignment of products
d = c;
add_assign_using_evaluator(c.noalias(), prod(a,b));
d.noalias() += a*b;
VERIFY_IS_APPROX(c, d);
d = c;
subtract_assign_using_evaluator(c.noalias(), prod(a,b));
d.noalias() -= a*b;
VERIFY_IS_APPROX(c, d);
}
{