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- merge ei_xpr_copy and ei_eval_if_needed_before_nesting

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- make use of CoeffReadCost to determine when to unroll the loops,
  for now only in Product.h and in OperatorEquals.h
performance remains the same: generally still not as good as before the
big changes.
This commit is contained in:
Benoit Jacob
2008-04-06 18:01:03 +00:00
parent 30ec34de36
commit 371d302efb
5 changed files with 49 additions and 32 deletions
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27
Eigen/src/Core/ForwardDeclarations.h
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@@ -83,27 +83,30 @@ template<typename T> struct ei_eval
template<typename T> struct ei_unref { typedef T type; };
template<typename T> struct ei_unref<T&> { typedef T type; };
template<typename T> struct ei_xpr_copy
template<typename T> struct ei_is_temporary
{
typedef typename ei_meta_if< ei_traits<T>::Flags & EvalBeforeNestingBit,
typename ei_eval<T>::type, const T&>::ret type;
enum { ret = 0 };
};
template<typename T> struct ei_xpr_copy<Temporary<T> >
template<typename T> struct ei_is_temporary<Temporary<T> >
{
typedef Temporary<T> type;
enum { ret = 1 };
};
template<typename T, int n=1> struct ei_eval_if_needed_before_nesting
template<typename T, int n=1> struct ei_xpr_copy
{
// FIXME should we consider the additional store as well as the creation cost of the temporary ?
enum { eval = T::Flags & EvalBeforeNestingBit
|| (n+1) * NumTraits<typename ei_traits<T>::Scalar>::ReadCost < (n-1) * T::CoeffReadCost };
typedef typename ei_meta_if<eval, typename ei_eval<T>::type, T>::ret XprType;
typedef typename ei_meta_if<eval, typename ei_eval<T>::type, typename T::XprCopy>::ret CopyType;
typedef typename ei_meta_if<
ei_is_temporary<T>::ret,
T,
typename ei_meta_if<
ei_traits<T>::Flags & EvalBeforeNestingBit
|| (n+1) * NumTraits<typename ei_traits<T>::Scalar>::ReadCost < (n-1) * T::CoeffReadCost,
typename ei_eval<T>::type,
const T&
>::ret
>::ret type;
};
template<typename T> struct ei_functor_traits
{
enum