diff --git a/src/include/map_range.h b/src/include/map_range.h
index 6831cc6..1181a70 100644
--- a/src/include/map_range.h
+++ b/src/include/map_range.h
@@ -57,6 +57,7 @@ namespace MultiArrayTools
 	//typedef SingleIndex<typename Op::value_type,STYPE> OIType;
 	static constexpr size_t LAYER = Expr::LAYER + 1;
 	static constexpr size_t SIZE = Expr::SIZE + Op::SIZE;
+	static constexpr size_t NHLAYER = Expr::NHLAYER + 1;
 	
     private:
 	OpExpr() = default;
diff --git a/src/include/multi_array_operation.cc.h b/src/include/multi_array_operation.cc.h
index dea6150..ab0f068 100644
--- a/src/include/multi_array_operation.cc.h
+++ b/src/include/multi_array_operation.cc.h
@@ -346,7 +346,7 @@ namespace MultiArrayTools
     template <typename V, class ET>
     inline const V& ConstOperationRoot<T,Ranges...>::vget(ET pos) const
     {
-	VCHECK(pos.val());
+	//VCHECK(pos.val());
 	return *(reinterpret_cast<const V*>(mDataPtr+pos.val()));
     }
 
@@ -665,7 +665,7 @@ namespace MultiArrayTools
     template <typename V, class ET>
     inline V& OperationRoot<T,Ranges...>::vget(ET pos) const
     {
-	VCHECK(pos.val());
+	//VCHECK(pos.val());
 	return *(reinterpret_cast<V*>(mDataPtr+pos.val()));
     }
 
@@ -740,12 +740,12 @@ namespace MultiArrayTools
     template <class IOp, class OpClass>
     auto ParallelOperationRoot<T,Ranges...>::asx(const OpClass& in) const
         -> decltype(mIndex.pifor(1,in.loop(AssignmentExpr<T,IOp,ParallelOperationRoot<T,Ranges...>,OpClass,OpIndexAff::TARGET>
-                                          (mOrigDataPtr,*this,in))))
+                                          (mOrigDataPtr,*this,in))).template vec<IOp::VSIZE>())
 
     {
         static_assert( OpClass::SIZE == decltype(in.rootSteps())::SIZE, "Ext Size mismatch" );
         return mIndex.pifor(1,in.loop(AssignmentExpr<T,IOp,ParallelOperationRoot<T,Ranges...>,OpClass,OpIndexAff::TARGET>
-                                     (mOrigDataPtr,*this,in)));
+                                     (mOrigDataPtr,*this,in))).template vec<IOp::VSIZE>();
     }
 
     template <typename T, class... Ranges>
@@ -763,11 +763,11 @@ namespace MultiArrayTools
     template <class IOp, class OpClass, class Index>
     auto ParallelOperationRoot<T,Ranges...>::asx(const OpClass& in, const std::shared_ptr<Index>& i) const
         -> decltype(i->pifor(1,in.loop(AssignmentExpr<T,IOp,ParallelOperationRoot<T,Ranges...>,OpClass>
-                                      (mOrigDataPtr,*this,in))))
+                                      (mOrigDataPtr,*this,in))).template vec<IOp::VSIZE>())
     {
         static_assert( OpClass::SIZE == decltype(in.rootSteps())::SIZE, "Ext Size mismatch" );
         return i->pifor(1,in.loop(AssignmentExpr<T,IOp,ParallelOperationRoot<T,Ranges...>,OpClass>
-                                 (mOrigDataPtr,*this,in)));
+                                 (mOrigDataPtr,*this,in))).template vec<IOp::VSIZE>();
     }
 
     template <typename T, class... Ranges>
@@ -814,7 +814,7 @@ namespace MultiArrayTools
     template <class OpClass>
     ParallelOperationRoot<T,Ranges...>& ParallelOperationRoot<T,Ranges...>::operator=(const OpClass& in)
     {
-        assign(in)();
+	VExec<OpClass::VABLE>::template exec<identity>(*this,in);
         return *this;
     }
 
@@ -822,7 +822,7 @@ namespace MultiArrayTools
     template <class OpClass>
     ParallelOperationRoot<T,Ranges...>& ParallelOperationRoot<T,Ranges...>::operator+=(const OpClass& in)
     {
-        plus(in)();
+	VExec<OpClass::VABLE>::template exec<xxxplus>(*this,in);
         return *this;
     }
 
diff --git a/src/include/multi_array_operation.h b/src/include/multi_array_operation.h
index 3ac063e..bb84e8a 100644
--- a/src/include/multi_array_operation.h
+++ b/src/include/multi_array_operation.h
@@ -259,7 +259,7 @@ namespace MultiArrayTools
 	template <typename Op, class ExtType>
 	static inline void f(T*& t, size_t pos, const Op& op, ExtType e)
 	{
-	    VCHECK(pos);
+	    //VCHECK(pos);
 	    VFunc<F>::selfApply(*reinterpret_cast<value_type*>(t+pos),op.template vget<value_type>(e));
 	}
     };
@@ -332,6 +332,7 @@ namespace MultiArrayTools
     public:
 
         static constexpr size_t LAYER = 0;
+        static constexpr size_t NHLAYER = 0;
         static constexpr size_t SIZE = Target::SIZE + OpClass::SIZE;
         typedef decltype(mTar.rootSteps(0).extend( mSec.rootSteps(0) )) ExtType;
 	    
@@ -371,7 +372,8 @@ namespace MultiArrayTools
 
     public:
         static constexpr size_t LAYER = 0;
-        static constexpr size_t SIZE = RootSum<Ops...>::SIZE;
+	static constexpr size_t NHLAYER = 0;
+	static constexpr size_t SIZE = RootSum<Ops...>::SIZE;
         typedef decltype(RootSumN<sizeof...(Ops)-1>::rootSteps(mOps,0) ) ExtType;
 
 	MOp(const Ops&... exprs);
@@ -410,6 +412,7 @@ namespace MultiArrayTools
     public:
 
         static constexpr size_t LAYER = 0;
+	static constexpr size_t NHLAYER = 0;
         static constexpr size_t SIZE = OpClass::SIZE + NextExpr::SIZE;
         typedef decltype(mSec.rootSteps(0).extend( mNExpr.rootSteps(0) ) ) ExtType;
 	    
@@ -699,7 +702,7 @@ namespace MultiArrayTools
         template <class IOp, class OpClass>
         auto asx(const OpClass& in) const
             -> decltype(mIndex.pifor(1,in.loop(AssignmentExpr<T,IOp,ParallelOperationRoot<T,Ranges...>,OpClass,OpIndexAff::TARGET>
-                                              (mOrigDataPtr,*this,in))));
+                                              (mOrigDataPtr,*this,in))).template vec<IOp::VSIZE>());
 
         template <class IOp, class OpClass>
         auto asxExpr(const OpClass& in) const
@@ -708,7 +711,7 @@ namespace MultiArrayTools
         template <class IOp, class OpClass, class Index>
         auto asx(const OpClass& in, const std::shared_ptr<Index>& i) const
             -> decltype(i->pifor(1,in.loop(AssignmentExpr<T,IOp,ParallelOperationRoot<T,Ranges...>,OpClass>
-                                          (mOrigDataPtr,*this,in))));
+                                          (mOrigDataPtr,*this,in))).template vec<IOp::VSIZE>());
             
         template <class OpClass>
         auto assign(const OpClass& in) const
diff --git a/src/include/xfor/xfor.h b/src/include/xfor/xfor.h
index d7b7e1e..372c334 100644
--- a/src/include/xfor/xfor.h
+++ b/src/include/xfor/xfor.h
@@ -271,6 +271,7 @@ namespace MultiArrayHelper
 	
 	static constexpr size_t LAYER = Expr::LAYER + 1;
 	static constexpr size_t SIZE = Expr::SIZE;
+	static constexpr size_t NHLAYER = Expr::NHLAYER + 1;
 
 	SingleExpression(const SingleExpression& in) = default;
 	SingleExpression& operator=(const SingleExpression& in) = default;
@@ -326,6 +327,7 @@ namespace MultiArrayHelper
 	
 	static constexpr size_t LAYER = Expr::LAYER + 1;
 	static constexpr size_t SIZE = Expr::SIZE + 1;
+	static constexpr size_t NHLAYER = Expr::NHLAYER + 1;
 
 	SubExpr(const SubExpr& in) = default;
 	SubExpr& operator=(const SubExpr& in) = default;
@@ -410,6 +412,36 @@ namespace MultiArrayHelper
 	}
     };
 
+    template <ForType FT, size_t LAYER>
+    struct NHLayer
+    {
+	template <class Expr>
+	static constexpr size_t get()
+	{
+	    return Expr::NHLAYER + 1;
+	}
+    };
+
+    template <size_t LAYER>
+    struct NHLayer<ForType::HIDDEN,LAYER>
+    {
+	template <class Expr>
+	static constexpr size_t get()
+	{
+	    return 0;
+	}
+    };
+
+    template <>
+    struct NHLayer<ForType::DEFAULT,1>
+    {
+	template <class Expr>
+	static constexpr size_t get()
+	{
+	    return Expr::LAYER;
+	}
+    };
+
     template <class IndexClass, class Expr, ForType FT, size_t DIV>
     class For : public ExpressionBase
     {
@@ -430,11 +462,12 @@ namespace MultiArrayHelper
         
     public:
 	typedef ExpressionBase EB;
-	
+
 	static constexpr size_t LAYER = Expr::LAYER + 1;
 	static constexpr size_t SIZE = Expr::SIZE;
 	static constexpr size_t MAX = RangeType::SIZE / DIV;
-
+	static constexpr size_t NHLAYER = (FT == ForType::HIDDEN) ? 0 : Expr::NHLAYER + 1;
+	
 	For(const For& in) = default;
 	For& operator=(const For& in) = default;
 	For(For&& in) = default;
@@ -455,8 +488,10 @@ namespace MultiArrayHelper
 
 	virtual std::intptr_t vI() const override final
 	{
-	    if(mStep == 1 and LAYER == 1 and mMax % DIV == 0){
-		VCHECK(LAYER);
+	    if(mStep == 1 and NHLAYER == 1 and mMax % DIV == 0){
+	    //if(mStep == 1 and mMax % DIV == 0){
+		//VCHECK(LAYER);
+		//VCHECK(NHLAYER);
 		return reinterpret_cast<std::intptr_t>(mIndPtr);
 	    }
 	    return mExpr.vI();
@@ -465,9 +500,9 @@ namespace MultiArrayHelper
 	template <size_t VS>
 	auto vec() const
 	{
-	    typedef typename MkVFor<LAYER,RangeType::SIZE % DIV == 0 or RangeType::SIZE == static_cast<size_t>(-1)>::
-		template type<VS,IndexClass,decltype(MkVExpr<LAYER>::template mk<VS>(mExpr)),FT> oType;
-	    return oType(mIndPtr,mStep,MkVExpr<LAYER>::template mk<VS>(mExpr));
+	    typedef typename MkVFor<NHLAYER,RangeType::SIZE % DIV == 0 or RangeType::SIZE == static_cast<size_t>(-1)>::
+		template type<VS,IndexClass,decltype(MkVExpr<NHLAYER>::template mk<VS>(mExpr)),FT> oType;
+	    return oType(mIndPtr,mStep,MkVExpr<NHLAYER>::template mk<VS>(mExpr));
 	}
 
 	inline void operator()(size_t mlast, DExt last) override final;
@@ -509,6 +544,7 @@ namespace MultiArrayHelper
 	static constexpr size_t LAYER = Expr::LAYER + 1;
 	static constexpr size_t SIZE = Expr::SIZE;
 	static constexpr size_t MAX = RangeType::SIZE / DIV;
+	static constexpr size_t NHLAYER = Expr::NHLAYER + 1;
 
 	PFor(const PFor& in) = default;
 	PFor& operator=(const PFor& in) = default;
@@ -524,8 +560,10 @@ namespace MultiArrayHelper
 	//virtual size_t divResid() const override final { return mMax % DIV + MkVExpr<LAYER>::divResid(mExpr); }
 	virtual std::intptr_t vI() const override final
 	{
-	    if(mStep == 1 and LAYER == 1 and mMax % DIV == 0){
-		VCHECK(LAYER);
+	    if(mStep == 1 and NHLAYER == 1 and mMax % DIV == 0){
+	    //if(mStep == 1 and mMax % DIV == 0){
+		//VCHECK(LAYER);
+		//VCHECK(LAYER);
 		return reinterpret_cast<std::intptr_t>(mIndPtr);
 	    }
 	    return mExpr.vI();
@@ -534,9 +572,9 @@ namespace MultiArrayHelper
 	template <size_t VS>
 	auto vec() const
 	{
-	    typedef typename MkVFor<LAYER,RangeType::SIZE % DIV == 0 or RangeType::SIZE == static_cast<size_t>(-1)>::
-		template ptype<VS,IndexClass,decltype(MkVExpr<LAYER>::template mk<VS>(mExpr))> oType;
-	    return oType(mIndPtr,mStep,MkVExpr<LAYER>::template mk<VS>(mExpr));
+	    typedef typename MkVFor<NHLAYER,RangeType::SIZE % DIV == 0 or RangeType::SIZE == static_cast<size_t>(-1)>::
+		template ptype<VS,IndexClass,decltype(MkVExpr<NHLAYER>::template mk<VS>(mExpr))> oType;
+	    return oType(mIndPtr,mStep,MkVExpr<NHLAYER>::template mk<VS>(mExpr));
 	}
 
 	virtual std::shared_ptr<ExpressionBase> deepCopy() const override final
@@ -574,6 +612,7 @@ namespace MultiArrayHelper
 	
 	static constexpr size_t LAYER = 0;
 	static constexpr size_t SIZE = 0;
+	static constexpr size_t NHLAYER = 0;
 
 	DynamicExpression(const DynamicExpression& in) :
 	    mThreadId(omp_get_thread_num()),
@@ -649,6 +688,7 @@ namespace MultiArrayHelper
 	
 	static constexpr size_t LAYER = Expr::LAYER + 1;
 	static constexpr size_t SIZE = Expr::SIZE;
+	static constexpr size_t NHLAYER = Expr::NHLAYER + 1;
 
 	ExpressionHolder(const ExpressionHolder& in) = default;
 	ExpressionHolder(ExpressionHolder&& in) = default;
diff --git a/src/tests/op_perf_test.cc b/src/tests/op_perf_test.cc
index 131db7e..90c711d 100644
--- a/src/tests/op_perf_test.cc
+++ b/src/tests/op_perf_test.cc
@@ -174,8 +174,8 @@ namespace {
 	auto beta = MAT::getIndex<SR>();
 	auto gamma = MAT::getIndex<SR>();
 	auto delta = MAT::getIndex<SR>();
-	//auto deltap = MAT::getIndex<SR>();
-	auto deltap = MAT::getIndex<GenSingleRange<size_t,SpaceType::NONE,1>>();
+	auto deltap = MAT::getIndex<SR>();
+	//auto deltap = MAT::getIndex<GenSingleRange<size_t,SpaceType::NONE,1>>();
 	
 	auto mix = MAT::mkMIndex( jj, alpha, beta, gamma );
 
@@ -217,8 +217,8 @@ namespace {
         
         auto begin = std::chrono::system_clock::now();
 	//for(size_t i = 0; i != os; ++i){
-        //res1(ii ,delta, deltap).par() += ma(ii, delta, alpha, alpha, beta, beta, gamma, gamma, deltap).c(mix);
-        tcast<v256>(res1)(ii ,delta, deltap).par() += tcast<v256>(ma)(delta, alpha, alpha, beta, beta, gamma, gamma, deltap).c(mix);
+        res1(ii ,delta, deltap).par() += ma(delta, alpha, alpha, beta, beta, gamma, gamma, deltap).c(mix);
+        //tcast<v256>(res1)(ii ,delta, deltap).par() += tcast<v256>(ma)(delta, alpha, alpha, beta, beta, gamma, gamma, deltap).c(mix);
 	//}
         auto end = std::chrono::system_clock::now();
 	std::cout << "MultiArray time: " << std::chrono::duration<double>(end-begin).count()