diff --git a/Eigen/Core b/Eigen/Core
index cbca16640..26195cd35 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -89,6 +89,14 @@
   #endif
 #endif
 
+#ifdef _OPENMP
+  #define EIGEN_HAS_OPENMP
+#endif
+
+#ifdef EIGEN_HAS_OPENMP
+#include <omp.h>
+#endif
+
 #include <cstdlib>
 #include <cmath>
 #include <complex>
@@ -209,6 +217,7 @@ struct Dense {};
 #include "src/Core/TriangularMatrix.h"
 #include "src/Core/SelfAdjointView.h"
 #include "src/Core/SolveTriangular.h"
+#include "src/Core/products/Parallelizer.h"
 #include "src/Core/products/CoeffBasedProduct.h"
 #include "src/Core/products/GeneralBlockPanelKernel.h"
 #include "src/Core/products/GeneralMatrixVector.h"
diff --git a/Eigen/src/Core/products/GeneralMatrixMatrix.h b/Eigen/src/Core/products/GeneralMatrixMatrix.h
index 7f449ac23..c13e09eac 100644
--- a/Eigen/src/Core/products/GeneralMatrixMatrix.h
+++ b/Eigen/src/Core/products/GeneralMatrixMatrix.h
@@ -128,33 +128,13 @@ struct ei_traits<GeneralProduct<Lhs,Rhs,GemmProduct> >
  : ei_traits<ProductBase<GeneralProduct<Lhs,Rhs,GemmProduct>, Lhs, Rhs> >
 {};
 
-template<bool Prallelize,typename Functor>
-void ei_multithreaded_product(const Functor& func, int size)
+template<typename Scalar, typename Gemm, typename Lhs, typename Rhs, typename Dest>
+struct ei_gemm_functor
 {
-  if(!Prallelize)
-    return func(0,size);
-  #ifdef OMP
-  int threads = omp_get_num_procs();
-  #else
-  int threads = 1;
-  #endif
-  int blockSize = size / threads;
-  #pragma omp parallel for schedule(static,1)
-  for(int i=0; i<threads; ++i)
-  {
-    int blockStart = i*blockSize;
-    int actualBlockSize = std::min(blockSize, size - blockStart);
-
-    func(blockStart, actualBlockSize);
-  }
-}
-
-template<typename Scalar, typename Gemm, typename Lhs, typename Rhs, typename Dest> struct ei_gemm_callback
-{
-  ei_gemm_callback(const Lhs& lhs, const Rhs& rhs, Dest& dest, Scalar actualAlpha)
+  ei_gemm_functor(const Lhs& lhs, const Rhs& rhs, Dest& dest, Scalar actualAlpha)
     : m_lhs(lhs), m_rhs(rhs), m_dest(dest), m_actualAlpha(actualAlpha)
   {}
-  
+
   void operator() (int start, int size) const
   {
     Gemm::run(m_lhs.rows(), size, m_lhs.cols(),
@@ -194,28 +174,18 @@ class GeneralProduct<Lhs, Rhs, GemmProduct>
       Scalar actualAlpha = alpha * LhsBlasTraits::extractScalarFactor(m_lhs)
                                  * RhsBlasTraits::extractScalarFactor(m_rhs);
 
-      typedef ei_gemm_callback<Scalar,ei_general_matrix_matrix_product<
-          Scalar,
-          (_ActualLhsType::Flags&RowMajorBit) ? RowMajor : ColMajor, bool(LhsBlasTraits::NeedToConjugate),
-          (_ActualRhsType::Flags&RowMajorBit) ? RowMajor : ColMajor, bool(RhsBlasTraits::NeedToConjugate),
-          (Dest::Flags&RowMajorBit) ? RowMajor : ColMajor>,
-          _ActualLhsType, _ActualRhsType, Dest> Functor;
-          
-      #ifdef OMP
-      ei_multithreaded_product<true>(Functor(lhs, rhs, dst, actualAlpha), this->cols());
-      #else
+      typedef ei_gemm_functor<
+        Scalar,
         ei_general_matrix_matrix_product<
           Scalar,
           (_ActualLhsType::Flags&RowMajorBit) ? RowMajor : ColMajor, bool(LhsBlasTraits::NeedToConjugate),
           (_ActualRhsType::Flags&RowMajorBit) ? RowMajor : ColMajor, bool(RhsBlasTraits::NeedToConjugate),
-          (Dest::Flags&RowMajorBit) ? RowMajor : ColMajor>
-        ::run(
-            this->rows(), this->cols(), lhs.cols(),
-            (const Scalar*)&(lhs.const_cast_derived().coeffRef(0,0)), lhs.stride(),
-            (const Scalar*)&(rhs.const_cast_derived().coeffRef(0,0)), rhs.stride(),
-            (Scalar*)&(dst.coeffRef(0,0)), dst.stride(),
-            actualAlpha);
-      #endif
+          (Dest::Flags&RowMajorBit) ? RowMajor : ColMajor>,
+        _ActualLhsType,
+        _ActualRhsType,
+        Dest> Functor;
+
+      ei_run_parallel_1d<true>(Functor(lhs, rhs, dst, actualAlpha), this->cols());
     }
 };
 
diff --git a/Eigen/src/Core/products/Parallelizer.h b/Eigen/src/Core/products/Parallelizer.h
new file mode 100644
index 000000000..d555508b2
--- /dev/null
+++ b/Eigen/src/Core/products/Parallelizer.h
@@ -0,0 +1,50 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2010 Gael Guennebaud <g.gael@free.fr>
+//
+// 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_PARALLELIZER_H
+#define EIGEN_PARALLELIZER_H
+
+template<bool Parallelize,typename Functor>
+void ei_run_parallel_1d(const Functor& func, int size)
+{
+#ifndef EIGEN_HAS_OPENMP
+  func(0,size);
+#else
+  if(!Parallelize)
+    return func(0,size);
+
+  int threads = omp_get_num_procs();
+  int blockSize = size / threads;
+  #pragma omp parallel for schedule(static,1)
+  for(int i=0; i<threads; ++i)
+  {
+    int blockStart = i*blockSize;
+    int actualBlockSize = std::min(blockSize, size - blockStart);
+
+    func(blockStart, actualBlockSize);
+  }
+#endif
+}
+
+#endif // EIGEN_GENERAL_MATRIX_MATRIX_H