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* make use of the EvalBeforeNestingBit and EvalBeforeAssigningBit

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in ei_xpr_copy and operator=, respectively.
 * added Matrix::lazyAssign() when EvalBeforeAssigningBit must be skipped
   (mainly internal use only)
 * all expressions are now stored by const reference
 * added Temporary xpr: .temporary() must be called on any temporary expression
   not directly returned by a function (mainly internal use only)
 * moved all functors in the Functors.h header
 * added some preliminaries stuff for the explicit vectorization
This commit is contained in:
Gael Guennebaud
2008-04-05 11:10:54 +00:00
parent 048910caae
commit b4a156671f
16 changed files with 597 additions and 360 deletions
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47
Eigen/src/Core/ForwardDeclarations.h
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@@ -31,6 +31,7 @@ template<typename T> struct NumTraits;
template<typename _Scalar, int _Rows, int _Cols, unsigned int _Flags, int _MaxRows, int _MaxCols> class Matrix;
template<typename ExpressionType> class Lazy;
template<typename ExpressionType> class Temporary;
template<typename MatrixType> class Minor;
template<typename MatrixType, int BlockRows=Dynamic, int BlockCols=Dynamic> class Block;
template<typename MatrixType> class Transpose;
@@ -69,25 +70,6 @@ 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_copy_unless_matrix
{
typedef T type;
};
template<typename _Scalar, int _Rows, int _Cols, unsigned int _Flags, int _MaxRows, int _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,
@@ -98,27 +80,34 @@ template<typename T> struct ei_eval
ei_traits<T>::MaxColsAtCompileTime> type;
};
template<typename T> struct ei_eval_temporary
template<typename T> struct ei_xpr_copy
{
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;
typedef typename ei_meta_if< ei_traits<T>::Flags & EvalBeforeNestingBit,
typename ei_eval<T>::type, const T&>::ret type;
};
template<typename T> struct ei_xpr_copy<Temporary<T> >
{
typedef Temporary<T> type;
};
template<typename T, int n=1> struct ei_eval_if_needed_before_nesting
{
// FIXME should we consider the additional store as well as the creation cost of the temporary ?
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;
|| n * 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;
};
template<typename T> struct ei_functor_traits
{
enum { Cost = T::Cost };
enum
{
Cost = 10,
IsVectorizable = false
};
};