DenseBase::IsRowMajor now takes the special case of vectors into account.

Eigen/src/Array/Reverse.h

@@ -85,7 +85,7 @@ template<typename MatrixType, int Direction> class Reverse
   protected:
     enum {
       PacketSize = ei_packet_traits<Scalar>::size,
-      IsRowMajor = Flags & RowMajorBit,
+      IsRowMajor = MatrixType::IsRowMajor,
       IsColMajor = !IsRowMajor,
       ReverseRow = (Direction == Vertical)   || (Direction == BothDirections),
       ReverseCol = (Direction == Horizontal) || (Direction == BothDirections),

Eigen/src/Core/Assign.h

@@ -55,9 +55,7 @@ private:
   };
 
   enum {
-    LhsIsEffectivelyRowMajor = (Derived::RowsAtCompileTime==1) || (int(Derived::Flags)&RowMajorBit),
-    RhsIsEffectivelyRowMajor = (OtherDerived::RowsAtCompileTime==1) || (int(OtherDerived::Flags)&RowMajorBit),
-    StorageOrdersAgree = (LhsIsEffectivelyRowMajor == RhsIsEffectivelyRowMajor),
+    StorageOrdersAgree = (int(Derived::IsRowMajor) == int(OtherDerived::IsRowMajor)),
     MightVectorize = StorageOrdersAgree
                   && (int(Derived::Flags) & int(OtherDerived::Flags) & ActualPacketAccessBit),
     MayInnerVectorize  = MightVectorize && int(InnerSize)!=Dynamic && int(InnerSize)%int(PacketSize)==0

Eigen/src/Core/DenseBase.h

@@ -124,7 +124,11 @@ template<typename Derived> class DenseBase
           * constructed from this one. See the \ref flags "list of flags".
           */
 
-      IsRowMajor = int(Flags) & RowMajorBit, /**< True if this expression is row major. */
+      IsRowMajor = RowsAtCompileTime==1 ? 1
+                 : ColsAtCompileTime==1 ? 0
+                 : int(Flags) & RowMajorBit, /**< True if this expression has row-major effective addressing.
+                   For non-vectors, it is like reading the RowMajorBit on the Flags. For vectors, this is
+                   overriden by the convention that row-vectors are row-major and column-vectors are column-major. */
 
       InnerSizeAtCompileTime = int(IsVectorAtCompileTime) ? SizeAtCompileTime
                              : int(Flags)&RowMajorBit ? ColsAtCompileTime : RowsAtCompileTime,
@@ -245,10 +249,7 @@ template<typename Derived> class DenseBase
       */
     inline int rowStride() const
     {
-      return ColsAtCompileTime==1 ? innerStride()
-           : RowsAtCompileTime==1 ? outerStride()
-           : IsRowMajor ? outerStride()
-           : innerStride();
+      return IsRowMajor ? outerStride() : innerStride();
     }
 
     /** \returns the pointer increment between two consecutive columns.
@@ -257,10 +258,7 @@ template<typename Derived> class DenseBase
       */
     inline int colStride() const
     {
-      return ColsAtCompileTime==1 ? outerStride()
-           : RowsAtCompileTime==1 ? innerStride()
-           : IsRowMajor ? innerStride()
-           : outerStride();
+      return IsRowMajor ? innerStride() : outerStride();
     }
 
 #ifndef EIGEN_PARSED_BY_DOXYGEN