diff --git a/src/hotspot/share/opto/intrinsicnode.hpp b/src/hotspot/share/opto/intrinsicnode.hpp
index e8ebad788eb..580d5342db7 100644
--- a/src/hotspot/share/opto/intrinsicnode.hpp
+++ b/src/hotspot/share/opto/intrinsicnode.hpp
@@ -184,12 +184,12 @@ class VectorizedHashCodeNode: public Node {
 //------------------------------EncodeISOArray--------------------------------
 // encode char[] to byte[] in ISO_8859_1 or ASCII
 class EncodeISOArrayNode: public Node {
-  bool ascii;
+  bool _ascii;
  public:
   EncodeISOArrayNode(Node* control, Node* arymem, Node* s1, Node* s2, Node* c, bool ascii)
-    : Node(control, arymem, s1, s2, c), ascii(ascii) {}
+    : Node(control, arymem, s1, s2, c), _ascii(ascii) {}
 
-  bool is_ascii() { return ascii; }
+  bool is_ascii() { return _ascii; }
   virtual int Opcode() const;
   virtual bool depends_only_on_test() const { return false; }
   virtual const Type* bottom_type() const { return TypeInt::INT; }
@@ -198,6 +198,11 @@ class EncodeISOArrayNode: public Node {
   virtual uint ideal_reg() const { return Op_RegI; }
   virtual Node* Ideal(PhaseGVN* phase, bool can_reshape);
   virtual const Type* Value(PhaseGVN* phase) const;
+  virtual uint size_of() const { return sizeof(EncodeISOArrayNode); }
+  virtual uint hash() const { return Node::hash() + _ascii; }
+  virtual bool cmp(const Node& n) const {
+    return Node::cmp(n) && _ascii == ((EncodeISOArrayNode&)n).is_ascii();
+  }
 };
 
 //-------------------------------DigitNode----------------------------------------
diff --git a/src/hotspot/share/opto/machnode.hpp b/src/hotspot/share/opto/machnode.hpp
index a455e420d5d..96cedfec397 100644
--- a/src/hotspot/share/opto/machnode.hpp
+++ b/src/hotspot/share/opto/machnode.hpp
@@ -492,6 +492,7 @@ class MachConstantNode : public MachTypeNode {
   int  constant_offset() const { return ((MachConstantNode*) this)->constant_offset(); }
   // Unchecked version to avoid assertions in debug output.
   int  constant_offset_unchecked() const;
+  virtual uint size_of() const { return sizeof(MachConstantNode); }
 };
 
 //------------------------------MachUEPNode-----------------------------------
@@ -526,17 +527,15 @@ class MachPrologNode : public MachIdealNode {
 //------------------------------MachEpilogNode--------------------------------
 // Machine function Epilog Node
 class MachEpilogNode : public MachIdealNode {
+private:
+  bool _do_polling;
 public:
   MachEpilogNode(bool do_poll = false) : _do_polling(do_poll) {}
   virtual void emit(CodeBuffer &cbuf, PhaseRegAlloc *ra_) const;
   virtual uint size(PhaseRegAlloc *ra_) const;
   virtual int reloc() const;
   virtual const Pipeline *pipeline() const;
-
-private:
-  bool _do_polling;
-
-public:
+  virtual uint size_of() const { return sizeof(MachEpilogNode); }
   bool do_polling() const { return _do_polling; }
 
 #ifndef PRODUCT
@@ -560,6 +559,7 @@ class MachNopNode : public MachIdealNode {
 
   virtual int ideal_Opcode() const { return Op_Con; } // bogus; see output.cpp
   virtual const Pipeline *pipeline() const;
+  virtual uint size_of() const { return sizeof(MachNopNode); }
 #ifndef PRODUCT
   virtual const char *Name() const { return "Nop"; }
   virtual void format( PhaseRegAlloc *, outputStream *st ) const;
@@ -787,6 +787,7 @@ class MachJumpNode : public MachConstantNode {
   MachJumpNode() : MachConstantNode() {
     init_class_id(Class_MachJump);
   }
+  virtual uint size_of() const { return sizeof(MachJumpNode); }
 };
 
 //------------------------------MachGotoNode-----------------------------------
@@ -883,6 +884,7 @@ class MachSafePointNode : public MachReturnNode {
     assert(verify_jvms(jvms), "jvms must match");
     set_req(_jvmadj + jvms->monoff() + idx, c);
   }
+  virtual uint size_of() const { return sizeof(MachSafePointNode); }
 };
 
 //------------------------------MachCallNode----------------------------------
@@ -997,6 +999,7 @@ class MachCallDynamicJavaNode : public MachCallJavaNode {
 #ifndef PRODUCT
   virtual void dump_spec(outputStream *st) const;
 #endif
+  virtual uint size_of() const { return sizeof(MachCallDynamicJavaNode); }
 };
 
 //------------------------------MachCallRuntimeNode----------------------------
@@ -1030,6 +1033,7 @@ class MachHaltNode : public MachReturnNode {
   bool _reachable;
   const char* _halt_reason;
   virtual JVMState* jvms() const;
+  virtual uint size_of() const { return sizeof(MachHaltNode); }
   bool is_reachable() const {
     return _reachable;
   }
diff --git a/src/hotspot/share/opto/memnode.hpp b/src/hotspot/share/opto/memnode.hpp
index f12e08f8fd0..3ac549932cb 100644
--- a/src/hotspot/share/opto/memnode.hpp
+++ b/src/hotspot/share/opto/memnode.hpp
@@ -1102,6 +1102,11 @@ class ClearArrayNode: public Node {
   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
   virtual uint match_edge(uint idx) const;
   bool is_large() const { return _is_large; }
+  virtual uint size_of() const { return sizeof(ClearArrayNode); }
+  virtual uint hash() const { return Node::hash() + _is_large; }
+  virtual bool cmp(const Node& n) const {
+    return Node::cmp(n) && _is_large == ((ClearArrayNode&)n).is_large();
+  }
 
   // Clear the given area of an object or array.
   // The start offset must always be aligned mod BytesPerInt.
diff --git a/src/hotspot/share/opto/opaquenode.hpp b/src/hotspot/share/opto/opaquenode.hpp
index 75b67fdea09..15a63d92d42 100644
--- a/src/hotspot/share/opto/opaquenode.hpp
+++ b/src/hotspot/share/opto/opaquenode.hpp
@@ -107,6 +107,7 @@ class Opaque3Node : public Node {
   virtual const Type* bottom_type() const { return TypeInt::INT; }
   virtual Node* Identity(PhaseGVN* phase);
   bool rtm_opt() const { return (_opt == RTM_OPT); }
+  virtual uint size_of() const { return sizeof(Opaque3Node); }
 };
 
 // Input 1 is a check that we know implicitly is always true or false
@@ -154,6 +155,7 @@ class ProfileBooleanNode : public Node {
   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
   virtual Node* Identity(PhaseGVN* phase);
   virtual const Type *bottom_type() const { return TypeInt::BOOL; }
+  virtual uint size_of() const { return sizeof(ProfileBooleanNode); }
 };
 
 #endif // SHARE_OPTO_OPAQUENODE_HPP