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current state of the mess. One line fails in the tests, and

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useless copies are made when evaluating nested expressions.
Changes:
- kill LazyBit, introduce EvalBeforeNestingBit and EvalBeforeAssigningBit
- product and random don't evaluate immediately anymore
- eval() always evaluates
- change the value of Dynamic to some large positive value,
  in preparation of future simplifications
This commit is contained in:
Benoit Jacob
2008-04-03 16:54:19 +00:00
parent b8900d0b80
commit 249dc4f482
7 changed files with 67 additions and 72 deletions
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34
Eigen/src/Core/ForwardDeclarations.h
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@@ -69,40 +69,50 @@ template<typename Scalar> struct ei_scalar_quotient1_op;
template<typename Scalar> struct ei_scalar_min_op;
template<typename Scalar> struct ei_scalar_max_op;
template<typename T> struct ei_xpr_copy
template<typename T> struct ei_copy_unless_matrix
{
typedef T type;
};
template<typename _Scalar, int _Rows, int _Cols, unsigned int _Flags, int _MaxRows, int _MaxCols>
struct ei_xpr_copy<Matrix<_Scalar, _Rows, _Cols, _Flags, _MaxRows, _MaxCols> >
struct ei_copy_unless_matrix<Matrix<_Scalar, _Rows, _Cols, _Flags, _MaxRows, _MaxCols> >
{
typedef const Matrix<_Scalar, _Rows, _Cols, _Flags, _MaxRows, _MaxCols> & type;
};
template<typename T> struct ei_xpr_copy
{
typedef typename ei_meta_if<T::Flags & TemporaryBit,
T,
typename ei_copy_unless_matrix<T>::type
>::ret type;
};
template<typename T> struct ei_eval
{
typedef Matrix<typename ei_traits<T>::Scalar,
ei_traits<T>::RowsAtCompileTime,
ei_traits<T>::ColsAtCompileTime,
ei_traits<T>::Flags & ~LazyBit, // unset lazy bit after evaluation
ei_traits<T>::Flags & ~(EvalBeforeNestingBit | EvalBeforeAssigningBit),
ei_traits<T>::MaxRowsAtCompileTime,
ei_traits<T>::MaxColsAtCompileTime> type;
};
template<typename T, int n> struct ei_eval_if_expensive
template<typename T> struct ei_eval_temporary
{
enum { eval = n * NumTraits<typename T::Scalar>::ReadCost < (n-1) * T::CoeffReadCost };
typedef typename ei_meta_if<eval, typename T::Eval, T>::ret type;
typedef typename ei_meta_if<eval, typename T::Eval, T&>::ret reftype;
typedef Matrix<typename ei_traits<T>::Scalar,
ei_traits<T>::RowsAtCompileTime,
ei_traits<T>::ColsAtCompileTime,
(ei_traits<T>::Flags | TemporaryBit) & ~(EvalBeforeNestingBit | EvalBeforeAssigningBit),
ei_traits<T>::MaxRowsAtCompileTime,
ei_traits<T>::MaxColsAtCompileTime> type;
};
template<typename T> struct ei_eval_unless_lazy
template<typename T, int n=1> struct ei_eval_if_needed_before_nesting
{
typedef typename ei_meta_if<ei_traits<T>::Flags & LazyBit,
T,
typename ei_eval<T>::type
>::ret type;
enum { eval = T::Flags & EvalBeforeNestingBit
|| n * NumTraits<typename T::Scalar>::ReadCost < (n-1) * T::CoeffReadCost };
typedef typename ei_meta_if<eval, typename ei_eval_temporary<T>::type, T>::ret type;
};
#endif // EIGEN_FORWARDDECLARATIONS_H