diff --git a/include/codegen/selection.h b/include/codegen/selection.h
index 73c72f120..729c36adb 100644
--- a/include/codegen/selection.h
+++ b/include/codegen/selection.h
@@ -70,23 +70,40 @@ private:
   void init_indices();
 
 public:
-  distributed_tile(llvm::Type *ty, const shapes_t& shapes, const axes_t &axes, llvm::IRBuilder<> &builder);
-  void set_vectorized_iteration() { vectorized_ = true; }
-  void unset_vectorized_iteration() { vectorized_ = false; }
-  void set_value(indices_t idx, llvm::Value *v);
+  distributed_tile(llvm::Type *ty, const shapes_t& shapes, const axes_t &axes);
+  virtual void for_each(std::function<void(indices_t)> fn) = 0;
+
+protected:
+  axes_t axes_;
+  indices_map_t indices_;
+  values_t values_;
+};
+
+class serialized_distributed_tile: public distributed_tile {
+public:
+  using distributed_tile::distributed_tile;
+
+public:
+  void set_value(indices_t, llvm::Value *);
+  llvm::Value* get_value(indices_t idx);
+  void for_each(std::function<void(indices_t)> fn);
+};
+
+class vectorized_distributed_tile: public distributed_tile {
+private:
+  llvm::Type *make_vector_ty(llvm::Type *ty, size_t vector_size);
+
+public:
+  vectorized_distributed_tile(llvm::Type *ty, const shapes_t& shapes, const axes_t &axes, llvm::IRBuilder<> &builder);
+  void set_value(indices_t, llvm::Value *);
   llvm::Value* get_value(indices_t idx);
   void for_each(std::function<void(indices_t)> fn);
 
 private:
-  axes_t axes_;
-  indices_map_t indices_;
-  values_t values_;
-  size_t vector_size_;
   llvm::IRBuilder<> &builder_;
-  bool vectorized_;
+  size_t vector_size_;
 };
 
-
 class selection{
   typedef std::map<ir::value *, llvm::Value *> vmap_t;
   typedef std::map<ir::value *, tile *> tmap_t;
diff --git a/lib/codegen/selection.cpp b/lib/codegen/selection.cpp
index 501e25f49..2510f89e2 100644
--- a/lib/codegen/selection.cpp
+++ b/lib/codegen/selection.cpp
@@ -34,17 +34,43 @@ void distributed_tile::init_indices() {
   }
 }
 
-distributed_tile::distributed_tile(Type *ty, const shapes_t &shapes, const axes_t &axes, llvm::IRBuilder<> &builder)
-    : tile(ty, shapes), axes_(axes), builder_(builder), vectorized_(true) {
+
+distributed_tile::distributed_tile(Type *ty, const shapes_t &shapes, const axes_t &axes)
+    : tile(ty, shapes), axes_(axes) {
   init_indices();
   for(size_t i = 0; i < indices_.size(); i++)
-    values_.push_back(UndefValue::get(ty));
-  // vectorization
-  vector_size_ = 1;
-  if(ty->isVectorTy())
-    vector_size_ = ty->getVectorNumElements();
+    values_.push_back(UndefValue::get(ty_));
 }
 
+/* Serialized distributed tile */
+void serialized_distributed_tile::set_value(indices_t idx, Value *v) {
+  values_[indices_[idx]] = v;
+}
+
+void serialized_distributed_tile::get_value(indices_t idx) {
+  return values_[indices_[idx]];
+}
+
+void serialized_distributed_tile::for_each(std::function<void (indices_t)> fn) {
+  for(auto &idx: indices_)
+    fn(idx.first);
+}
+
+/* Vectorized distributed tile */
+llvm::Type *vectorized_distributed_tile::make_vector_ty(llvm::Type *ty, size_t vector_size) {
+  if(vector_size == 1)
+    return ty;
+  return VectorType::get(ty, vector_size);
+}
+
+vectorized_distributed_tile::vectorized_distributed_tile(Type *ty, const shapes_t &shapes, const axes_t &axes, llvm::IRBuilder<> &builder)
+    : distributed_tile(make_vector_ty(ty, axes[0].contiguous), shapes), axes_(axes), builder_(builder) {
+  vector_size_ = 1;
+  if(ty_->isVectorTy())
+    vector_size_ = ty_->getVectorNumElements();
+}
+
+
 void distributed_tile::set_value(indices_t idx, Value *v) {
   unsigned value_idx = indices_[idx];
   Value *&result = values_[value_idx/vector_size_*vector_size_];
@@ -54,6 +80,7 @@ void distributed_tile::set_value(indices_t idx, Value *v) {
   }
   // insert scalar in vector
   else {
+    std::cout << v->getType()->getScalarType()->getTypeID() << " " << result->getType()->getScalarType()->getTypeID() << std::endl;
     assert(vector_size_==1 || result->getType()->isVectorTy());
     assert(v->getType()->getScalarType() == result->getType()->getScalarType());
     result = builder_.CreateInsertElement(result, v, value_idx % vector_size_);
@@ -63,7 +90,7 @@ void distributed_tile::set_value(indices_t idx, Value *v) {
 Value* distributed_tile::get_value(indices_t idx) {
   unsigned value_idx = indices_[idx];
   Value *&result = values_[value_idx/vector_size_*vector_size_];
-  if(vectorized_ || vector_size_ == 1) {
+  if(vectorize_ || vector_size_ == 1) {
     assert(value_idx % vector_size_ == 0);
     return result;
   }
@@ -77,7 +104,7 @@ Value* distributed_tile::get_value(indices_t idx) {
 
 void distributed_tile::for_each(std::function<void (indices_t)> fn) {
   for(auto &idx: indices_) {
-    if(!vectorized_ || (idx.second % vector_size_ == 0))
+    if(!vectorize_ || (idx.second % vector_size_ == 0))
       fn(idx.first);
   }
 }
@@ -142,6 +169,8 @@ shared_tile::shared_tile(Type *ty, const shapes_t &shapes, Value *ptr, llvm::IRB
 
 void shared_tile::set_value(indices_t idx, Value *value) {
   Value *ptr = builder_.CreateGEP(ptr_, shared_offset(idx));
+  unsigned addr_space = ptr->getType()->getPointerAddressSpace();
+  ptr = builder_.CreateBitCast(ptr, value->getType()->getPointerTo(addr_space));
   builder_.CreateStore(value, ptr);
 }
 
@@ -159,13 +188,6 @@ Value* shared_tile::get_value(indices_t idx) {
   return builder_.CreateLoad(ptr);
 }
 
-/* helper to make vector type */
-llvm::Type *selection::make_vector_ty(llvm::Type *ty, size_t vector_size) {
-  if(vector_size == 1)
-    return ty;
-  return VectorType::get(ty, vector_size);
-}
-
 /* convert ir::type to Type */
 Type *selection::llvm_type(ir::type *ty, LLVMContext &ctx) {
   // function
@@ -422,16 +444,15 @@ void selection::create_tile(ir::value *v, IRBuilder<> &builder,
         axes[d].values = {builder.getInt32(0)};
       }
     }
-    distributed_tile *T = new distributed_tile(make_vector_ty(ty, axes[0].contiguous), shapes, axes, builder);
+    bool vectorize = dynamic_cast<ir::load_inst*>(v);
+    distributed_tile *T = new distributed_tile(ty, shapes, axes, builder, vectorize);
     tmap_.insert({v, T});
     // constant range
     if(dynamic_cast<ir::constant*>(v)){
-      T->unset_vectorized_iteration();
       T->for_each([&](indices_t idx){
         assert(idx.size() == 1);
         T->set_value(idx, idx[0]);
       });
-      T->set_vectorized_iteration();
     }
 
   }
@@ -498,7 +519,6 @@ void selection::lower_tile_instruction(ir::instruction *ins, llvm::IRBuilder<> &
     else if(dynamic_cast<ir::reshape_inst*>(ins)) {
       ir::value* in = ins->get_operand(0);
       distributed_tile *in_tile = (distributed_tile*)tmap_.at(in);
-      in_tile->unset_vectorized_iteration();
       result->for_each([&](indices_t out_idx){
         indices_t in_idx;
         for(size_t k = 0; k < shapes.size(); k++){
@@ -507,7 +527,6 @@ void selection::lower_tile_instruction(ir::instruction *ins, llvm::IRBuilder<> &
         }
         result->set_value(out_idx, in_tile->get_value(in_idx));
       });
-      in_tile->set_vectorized_iteration();
     }
     // splat
     else if(dynamic_cast<ir::splat_inst*>(ins)) {