Experimental: when doing memory-to-memory moves as part of a frame...

src/virtual-frame-ia32.h

Index: src/virtual-frame-ia32.h
===================================================================
--- src/virtual-frame-ia32.h	(revision 1245)
+++ src/virtual-frame-ia32.h	(working copy)
@@ -124,6 +124,10 @@
     return data_.index_;
   }
 
+#ifdef DEBUG
+  bool Equals(FrameElement other);
+#endif
+
  private:
   enum Type {
     INVALID,
@@ -313,10 +317,10 @@
   // Push the function on top of the frame.
   void PushFunction() { LoadFrameSlotAt(function_index()); }
 
-  // Lazily save the value of the esi register to the context frame slot.
+  // Save the value of the esi register to the context frame slot.
   void SaveContextRegister();
 
-  // Eagerly restore the esi register from the value of the frame context
+  // Restore the esi register from the value of the context frame
   // slot.
   void RestoreContextRegister();
 
@@ -429,10 +433,6 @@
   // the frame.  Nip(k) is equivalent to x = Pop(), Drop(k), Push(x).
   void Nip(int num_dropped);
 
-#ifdef DEBUG
-  bool IsSpilled();
-#endif
-
  private:
   // An illegal index into the virtual frame.
   static const int kIllegalIndex = -1;
@@ -576,6 +576,10 @@
   // Calls a code object which has already been prepared for calling
   // (via PrepareForCall).
   Result RawCallCodeObject(Handle<Code> code, RelocInfo::Mode rmode);
+
+#ifdef DEBUG
+  bool Equals(VirtualFrame* other);
+#endif
 };
 
 } }  // namespace v8::internal