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Introduce the macro ei_declare_local_nested_eval to help allocating on the stack local temporaries via alloca, and let outer-products makes a good use of it.

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If successful, we should use it everywhere nested_eval is used to declare local dense temporaries.
This commit is contained in:
Gael Guennebaud
2018-07-09 15:41:14 +02:00
parent 6190aa5632
commit de9e31a06d
4 changed files with 89 additions and 7 deletions
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2
Eigen/src/Core/util/XprHelper.h
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@@ -460,7 +460,7 @@ template<typename T, int n, typename PlainObject = typename plain_object_eval<T>
{
enum {
ScalarReadCost = NumTraits<typename traits<T>::Scalar>::ReadCost,
CoeffReadCost = evaluator<T>::CoeffReadCost, // NOTE What if an evaluator evaluate itself into a tempory?
CoeffReadCost = evaluator<T>::CoeffReadCost, // NOTE What if an evaluator evaluate itself into a temporary?
// Then CoeffReadCost will be small (e.g., 1) but we still have to evaluate, especially if n>1.
// This situation is already taken care by the EvalBeforeNestingBit flag, which is turned ON
// for all evaluator creating a temporary. This flag is then propagated by the parent evaluators.