diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index dff9b2c..1728193 100644
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -2464,7 +2464,8 @@
     // Otherwise, we can't fold it.  However, we can simplify it to SETUO/SETO
     // if it is not already.
     ISD::CondCode NewCond = UOF == 0 ? ISD::SETO : ISD::SETUO;
-    if (NewCond != Cond)
+    if (NewCond != Cond && (DCI.isBeforeLegalizeOps() 
+        || getCondCodeAction(NewCond, N0.getValueType()) == Legal))
       return DAG.getSetCC(dl, VT, N0, N1, NewCond);
   }