diff -r ea8e68232980 -r 59786aed9e12 src/arch/arm/types.hh
--- a/src/arch/arm/types.hh	Thu Jun 09 22:30:41 2011 -0400
+++ b/src/arch/arm/types.hh	Sat Jun 11 01:40:01 2011 -0400
@@ -433,6 +433,12 @@
                 _itstate == opc._itstate && _nextItstate == opc._nextItstate;
         }
 
+        bool
+        operator != (const PCState &opc) const
+        {
+            return !(*this == opc);
+        }
+
         void
         serialize(std::ostream &os)
         {
diff -r ea8e68232980 -r 59786aed9e12 src/arch/generic/types.hh
--- a/src/arch/generic/types.hh	Thu Jun 09 22:30:41 2011 -0400
+++ b/src/arch/generic/types.hh	Sat Jun 11 01:40:01 2011 -0400
@@ -98,6 +98,12 @@
         return _pc == opc._pc && _npc == opc._npc;
     }
 
+    bool
+    operator != (const PCStateBase &opc) const
+    {
+        return !(*this == opc);
+    }
+
     void
     serialize(std::ostream &os)
     {
@@ -235,6 +241,12 @@
                _upc == opc._upc && _nupc == opc._nupc;
     }
 
+    bool
+    operator != (const UPCState<MachInst> &opc) const
+    {
+        return !(*this == opc);
+    }
+
     void
     serialize(std::ostream &os)
     {
@@ -310,6 +322,12 @@
                _nnpc == opc._nnpc;
     }
 
+    bool
+    operator != (const DelaySlotPCState<MachInst> &opc) const
+    {
+        return !(*this == opc);
+    }
+
     void
     serialize(std::ostream &os)
     {
@@ -401,6 +419,12 @@
                _upc == opc._upc && _nupc == opc._nupc;
     }
 
+    bool
+    operator != (const DelaySlotUPCState<MachInst> &opc) const
+    {
+        return !(*this == opc);
+    }
+
     void
     serialize(std::ostream &os)
     {