diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index 44e07e2503f..a5810b0dfd7 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -375,10 +375,16 @@ public:
   /// implement this.  The default implementation of this aborts.
   virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
 
-  // getTargetNodeName() - This method returns the name of a target specific
-  // DAG node.
+  /// getTargetNodeName() - This method returns the name of a target specific
+  /// DAG node.
   virtual const char *getTargetNodeName(unsigned Opcode) const;
 
+  /// isMaskedValueZeroForTargetNode - Return true if 'Op & Mask' is known to
+  /// be zero. Op is expected to be a target specific node. Used by DAG
+  /// combiner.
+  virtual bool isMaskedValueZeroForTargetNode(const SDOperand &Op,
+                                              uint64_t Mask) const;
+
   //===--------------------------------------------------------------------===//
   // Scheduler hooks
   //