* Optimization: added a specialization of Block for xpr with DirectAccessBit

* some simplifications and fixes in cache friendly products

2 files changed, 7 insertions, 1 deletions

diff --git a/Eigen/src/Core/util/Constants.h b/Eigen/src/Core/util/Constants.h
index c51aa282b..7e2d37dff 100644
--- a/Eigen/src/Core/util/Constants.h
+++ b/Eigen/src/Core/util/Constants.h
@@ -206,6 +206,11 @@ enum {
   RowMajor = RowMajorBit
 };
 
+enum {
+  NoDirectAccess = 0,
+  HasDirectAccess = DirectAccessBit
+};
+
 const int FullyCoherentAccessPattern  = 0x1;
 const int InnerCoherentAccessPattern  = 0x2 | FullyCoherentAccessPattern;
 const int OuterCoherentAccessPattern  = 0x4 | InnerCoherentAccessPattern;
diff --git a/Eigen/src/Core/util/ForwardDeclarations.h b/Eigen/src/Core/util/ForwardDeclarations.h
index 922a3716f..f96d57747 100644
--- a/Eigen/src/Core/util/ForwardDeclarations.h
+++ b/Eigen/src/Core/util/ForwardDeclarations.h
@@ -42,7 +42,8 @@ class Matrix;
 template<typename ExpressionType, unsigned int Added, unsigned int Removed> class Flagged;
 template<typename ExpressionType> class NestByValue;
 template<typename MatrixType> class Minor;
-template<typename MatrixType, int BlockRows=Dynamic, int BlockCols=Dynamic> class Block;
+template<typename MatrixType, int BlockRows=Dynamic, int BlockCols=Dynamic,
+         int DirectAccessStatus = ei_traits<MatrixType>::Flags&DirectAccessBit> class Block;
 template<typename MatrixType> class Transpose;
 template<typename MatrixType> class Conjugate;
 template<typename NullaryOp, typename MatrixType>         class CwiseNullaryOp;