diff --git a/include/llvm/CodeGen/SelectionDAG.h b/include/llvm/CodeGen/SelectionDAG.h
index 136bdd5b4de..f1c93896565 100644
--- a/include/llvm/CodeGen/SelectionDAG.h
+++ b/include/llvm/CodeGen/SelectionDAG.h
@@ -970,6 +970,13 @@ public:
   /// class to allow target nodes to be understood.
   unsigned ComputeNumSignBits(SDValue Op, unsigned Depth = 0) const;
 
+  /// isBaseWithConstantOffset - Return true if the specified operand is an
+  /// ISD::ADD with a ConstantSDNode on the right-hand side, or if it is an
+  /// ISD::OR with a ConstantSDNode that is guaranteed to have the same
+  /// semantics as an ADD.  This handles the equivalence:
+  ///     X|Cst == X+Cst iff X&~Cst = 0.
+  bool isBaseWithConstantOffset(SDValue Op) const;
+  
   /// isKnownNeverNan - Test whether the given SDValue is known to never be NaN.
   bool isKnownNeverNaN(SDValue Op) const;