diff --git a/Eigen/src/Core/Stride.h b/Eigen/src/Core/Stride.h
new file mode 100644
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+++ b/Eigen/src/Core/Stride.h
@@ -0,0 +1,136 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2010 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// Eigen is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 3 of the License, or (at your option) any later version.
+//
+// Alternatively, you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License and a copy of the GNU General Public License along with
+// Eigen. If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef EIGEN_STRIDE_H
+#define EIGEN_STRIDE_H
+
+template<int _InnerStrideAtCompileTime, int _OuterStrideAtCompileTime>
+class Stride
+{
+  public:
+
+    enum {
+      InnerStrideAtCompileTime = _InnerStrideAtCompileTime,
+      OuterStrideAtCompileTime = _OuterStrideAtCompileTime
+    };
+
+    Stride()
+      : m_inner(InnerStrideAtCompileTime), m_outer(OuterStrideAtCompileTime)
+    {
+      ei_assert(InnerStrideAtCompileTime != Dynamic && OuterStrideAtCompileTime != Dynamic);
+    }
+
+    Stride(int innerStride, int outerStride)
+      : m_inner(innerStride), m_outer(outerStride)
+    {
+      ei_assert(innerStride>=0 && outerStride>=0);
+    }
+
+    Stride(const Stride& other)
+      : m_inner(other.inner()), m_outer(other.outer())
+    {}
+
+    inline int inner() const { return m_inner.value(); }
+    inline int outer() const { return m_outer.value(); }
+
+    template<int OtherInnerStrideAtCompileTime, int OtherOuterStrideAtCompileTime>
+    Stride<EIGEN_ENUM_MAX(InnerStrideAtCompileTime, OtherInnerStrideAtCompileTime),
+           EIGEN_ENUM_MAX(OuterStrideAtCompileTime, OtherOuterStrideAtCompileTime)>
+    operator|(const Stride<OtherInnerStrideAtCompileTime, OtherOuterStrideAtCompileTime>& other)
+    {
+      EIGEN_STATIC_ASSERT(!((InnerStrideAtCompileTime && OtherInnerStrideAtCompileTime)
+                         || (OuterStrideAtCompileTime && OtherOuterStrideAtCompileTime)),
+                          YOU_ALREADY_SPECIFIED_THIS_STRIDE)
+      int result_inner = InnerStrideAtCompileTime ? inner() : other.inner();
+      int result_outer = OuterStrideAtCompileTime ? outer() : other.outer();
+      return Stride<EIGEN_ENUM_MAX(InnerStrideAtCompileTime, OtherInnerStrideAtCompileTime),
+                    EIGEN_ENUM_MAX(OuterStrideAtCompileTime, OtherOuterStrideAtCompileTime)>
+                    (result_inner, result_outer);
+    }
+  protected:
+    ei_int_if_dynamic<InnerStrideAtCompileTime> m_inner;
+    ei_int_if_dynamic<OuterStrideAtCompileTime> m_outer;
+};
+
+template<int Value = Dynamic>
+class InnerStride : public Stride<Value, 0>
+{
+    typedef Stride<Value,0> Base;
+  public:
+    InnerStride() : Base() {}
+    InnerStride(int v) : Base(v,0) {}
+};
+
+template<int Value = Dynamic>
+class OuterStride : public Stride<0, Value>
+{
+    typedef Stride<0,Value> Base;
+  public:
+    OuterStride() : Base() {}
+    OuterStride(int v) : Base(0,v) {}
+};
+
+template<typename T, bool HasDirectAccess = int(ei_traits<T>::Flags)&DirectAccessBit>
+struct ei_outer_stride_or_outer_size_impl
+{
+  static inline int value(const T& x) { return x.outerStride(); }
+};
+
+template<typename T>
+struct ei_outer_stride_or_outer_size_impl<T, false>
+{
+  static inline int value(const T& x) { return x.outerSize(); }
+};
+
+template<typename T>
+inline int ei_outer_stride_or_outer_size(const T& x)
+{
+  return ei_outer_stride_or_outer_size_impl<T>::value(x);
+}
+
+template<typename T, bool HasDirectAccess = int(ei_traits<typename ei_cleantype<T>::type>::Flags)&DirectAccessBit>
+struct ei_inner_stride_at_compile_time
+{
+  enum { ret = ei_traits<typename ei_cleantype<T>::type>::InnerStrideAtCompileTime };
+};
+
+template<typename T>
+struct ei_inner_stride_at_compile_time<T, false>
+{
+  enum { ret = 1 };
+};
+
+template<typename T, bool HasDirectAccess = int(ei_traits<typename ei_cleantype<T>::type>::Flags)&DirectAccessBit>
+struct ei_outer_stride_at_compile_time
+{
+  enum { ret = ei_traits<typename ei_cleantype<T>::type>::OuterStrideAtCompileTime };
+};
+
+template<typename T>
+struct ei_outer_stride_at_compile_time<T, false>
+{
+  enum { ret = 1 };
+};
+
+#endif // EIGEN_STRIDE_H