diff --git a/Eigen/CMakeLists.txt b/Eigen/CMakeLists.txt
index 2a625e748..d749bcda3 100644
--- a/Eigen/CMakeLists.txt
+++ b/Eigen/CMakeLists.txt
@@ -1,4 +1,4 @@
-SET(Eigen_HEADERS Core CoreDeclarations LU Cholesky QR Geometry Sparse Array)
+SET(Eigen_HEADERS Core CoreDeclarations LU Cholesky QR Geometry Sparse Array SVD)
 
 IF(BUILD_LIB)
     SET(Eigen_SRCS
diff --git a/Eigen/src/CMakeLists.txt b/Eigen/src/CMakeLists.txt
index 4b0e75316..981938bba 100644
--- a/Eigen/src/CMakeLists.txt
+++ b/Eigen/src/CMakeLists.txt
@@ -1,6 +1,7 @@
 ADD_SUBDIRECTORY(Core)
 ADD_SUBDIRECTORY(LU)
 ADD_SUBDIRECTORY(QR)
+ADD_SUBDIRECTORY(SVD)
 ADD_SUBDIRECTORY(Cholesky)
 ADD_SUBDIRECTORY(Array)
 ADD_SUBDIRECTORY(Geometry)
diff --git a/Eigen/src/Core/CacheFriendlyProduct.h b/Eigen/src/Core/CacheFriendlyProduct.h
index 649b39cdb..320ec8992 100644
--- a/Eigen/src/Core/CacheFriendlyProduct.h
+++ b/Eigen/src/Core/CacheFriendlyProduct.h
@@ -89,11 +89,10 @@ static void ei_cache_friendly_product(
   const int l2BlockSizeAligned = (1 + std::max(l2BlockSize,l2BlockCols)/PacketSize)*PacketSize;
   const bool needRhsCopy = (PacketSize>1) && ((rhsStride%PacketSize!=0) || (size_t(rhs)%16!=0));
   Scalar* EIGEN_RESTRICT block = 0;
-  const int allocBlockSize = sizeof(Scalar)*l2BlockRows*size;
-  const bool allocBlockUsingAlloca = EIGEN_USE_ALLOCA && allocBlockSize<=16000000;
-  block = (Scalar*)ei_alloca_or_malloc(allocBlockUsingAlloca, allocBlockSize);
+  const int allocBlockSize = l2BlockRows*size;
+  block = ei_alloc_stack(Scalar, allocBlockSize);
   Scalar* EIGEN_RESTRICT rhsCopy
-    = (Scalar*)ei_alloca_or_malloc(true, sizeof(Scalar)*l2BlockSizeAligned*l2BlockSizeAligned);
+    = ei_alloc_stack(Scalar, l2BlockSizeAligned*l2BlockSizeAligned);
 
   // loops on each L2 cache friendly blocks of the result
   for(int l2i=0; l2i<rows; l2i+=l2BlockRows)
@@ -334,10 +333,8 @@ static void ei_cache_friendly_product(
     }
   }
 
-  if (!allocBlockUsingAlloca)
-    free(block);
-  if (!EIGEN_USE_ALLOCA)
-    free(rhsCopy);
+  ei_free_stack(block, Scalar, allocBlockSize);
+  ei_free_stack(rhsCopy, Scalar, l2BlockSizeAligned*l2BlockSizeAligned);
 }
 
 #endif // EIGEN_EXTERN_INSTANTIATIONS
diff --git a/Eigen/src/Core/Product.h b/Eigen/src/Core/Product.h
index 6d965e611..8c15a3852 100644
--- a/Eigen/src/Core/Product.h
+++ b/Eigen/src/Core/Product.h
@@ -550,7 +550,7 @@ struct ei_cache_friendly_product_selector<ProductType,LhsRows,ColMajor,HasDirect
        _res = &res.coeffRef(0);
     else
     {
-      _res = (Scalar*)ei_alloca_or_malloc(true, sizeof(Scalar)*res.size());
+      _res = ei_alloc_stack(Scalar,res.size());
       Map<Matrix<Scalar,DestDerived::RowsAtCompileTime,1> >(_res, res.size()) = res;
     }
     ei_cache_friendly_product_colmajor_times_vector(res.size(),
@@ -558,9 +558,10 @@ struct ei_cache_friendly_product_selector<ProductType,LhsRows,ColMajor,HasDirect
       product.rhs(), _res);
 
     if (!EvalToRes)
+    {
       res = Map<Matrix<Scalar,DestDerived::SizeAtCompileTime,1> >(_res, res.size());
-
-    if(!EIGEN_USE_ALLOCA) free(_res);
+      ei_free_stack(_res, Scalar, res.size());
+    }
   }
 };
 
@@ -595,7 +596,7 @@ struct ei_cache_friendly_product_selector<ProductType,1,LhsOrder,LhsAccess,RhsCo
        _res = &res.coeffRef(0);
     else
     {
-      _res = (Scalar*)ei_alloca_or_malloc(true, sizeof(Scalar)*res.size());
+      _res = ei_alloc_stack(Scalar, res.size());
       Map<Matrix<Scalar,DestDerived::SizeAtCompileTime,1> >(_res, res.size()) = res;
     }
     ei_cache_friendly_product_colmajor_times_vector(res.size(),
@@ -603,9 +604,10 @@ struct ei_cache_friendly_product_selector<ProductType,1,LhsOrder,LhsAccess,RhsCo
       product.lhs().transpose(), _res);
 
     if (!EvalToRes)
+    {
       res = Map<Matrix<Scalar,DestDerived::SizeAtCompileTime,1> >(_res, res.size());
-
-    if(!EIGEN_USE_ALLOCA) free(_res);
+      ei_free_stack(_res, Scalar, res.size());
+    }
   }
 };
 
@@ -627,13 +629,13 @@ struct ei_cache_friendly_product_selector<ProductType,LhsRows,RowMajor,HasDirect
        _rhs = &product.rhs().const_cast_derived().coeffRef(0);
     else
     {
-      _rhs = (Scalar*)ei_alloca_or_malloc(true, sizeof(Scalar)*product.rhs().size());
+      _rhs = ei_alloc_stack(Scalar, product.rhs().size());
       Map<Matrix<Scalar,Rhs::SizeAtCompileTime,1> >(_rhs, product.rhs().size()) = product.rhs();
     }
     ei_cache_friendly_product_rowmajor_times_vector(&product.lhs().const_cast_derived().coeffRef(0,0), product.lhs().stride(),
                                                     _rhs, product.rhs().size(), res);
 
-    if(!EIGEN_USE_ALLOCA) free(_rhs);
+    if (!UseRhsDirectly) ei_free_stack(_rhs, Scalar, product.rhs().size());
   }
 };
 
@@ -655,13 +657,13 @@ struct ei_cache_friendly_product_selector<ProductType,1,LhsOrder,LhsAccess,RhsCo
        _lhs = &product.lhs().const_cast_derived().coeffRef(0);
     else
     {
-      _lhs = (Scalar*)ei_alloca_or_malloc(true, sizeof(Scalar)*product.lhs().size());
+      _lhs = ei_alloc_stack(Scalar, product.lhs().size());
       Map<Matrix<Scalar,Lhs::SizeAtCompileTime,1> >(_lhs, product.lhs().size()) = product.lhs();
     }
     ei_cache_friendly_product_rowmajor_times_vector(&product.rhs().const_cast_derived().coeffRef(0,0), product.rhs().stride(),
                                                     _lhs, product.lhs().size(), res);
 
-    if(!EIGEN_USE_ALLOCA) free(_lhs);
+    if(!UseLhsDirectly) ei_free_stack(_lhs, Scalar, product.lhs().size());
   }
 };
 
diff --git a/Eigen/src/Core/util/Macros.h b/Eigen/src/Core/util/Macros.h
index c50aef9a6..1489a6be1 100644
--- a/Eigen/src/Core/util/Macros.h
+++ b/Eigen/src/Core/util/Macros.h
@@ -150,12 +150,16 @@ friend class Eigen::MatrixBase<Derived>;
 #define EIGEN_ENUM_MIN(a,b) (((int)a <= (int)b) ? (int)a : (int)b)
 #define EIGEN_ENUM_MAX(a,b) (((int)a >= (int)b) ? (int)a : (int)b)
 
+/*  ei_alloc_stack(TYPE,SIZE) allocates sizeof(TYPE)*SIZE bytes on the stack if sizeof(TYPE)*SIZE is smaller
+ *  than EIGEN_STACK_ALLOCATION_LIMIT. Otherwise the memory is allocated using the operator new.
+ *  Data allocated with ei_alloc_stack must be freed calling ei_free_stack(PTR,TYPE,SIZE)
+ */
 #ifdef __linux__
-# define EIGEN_USE_ALLOCA 1
-# define ei_alloca_or_malloc(condition, size) (condition?alloca(size):malloc(size))
+# define ei_alloc_stack(TYPE,SIZE) ((sizeof(TYPE)*(SIZE)>16000000) ? new TYPE[SIZE] : (TYPE*)alloca(sizeof(TYPE)*(SIZE)))
+# define ei_free_stack(PTR,TYPE,SIZE) if (sizeof(TYPE)*SIZE>16000000) delete[] PTR
 #else
-# define EIGEN_USE_ALLOCA 0
-# define ei_alloca_or_malloc(condition, size) malloc(size)
+# define ei_alloc_stack(TYPE,SIZE) new TYPE[SIZE]
+# define ei_free_stack(PTR,TYPE,SIZE) delete[] PTR
 #endif
 
 #endif // EIGEN_MACROS_H