diff --git a/llvm/include/llvm/CodeGen/MachineJumpTableInfo.h b/llvm/include/llvm/CodeGen/MachineJumpTableInfo.h
index c0f4af34c226..7f6c965d7cd2 100644
--- a/llvm/include/llvm/CodeGen/MachineJumpTableInfo.h
+++ b/llvm/include/llvm/CodeGen/MachineJumpTableInfo.h
@@ -26,6 +26,7 @@
 namespace llvm {
 
 class MachineBasicBlock;
+class TargetData;
 
 /// MachineJumpTableEntry - One jump table in the jump table info.
 ///
@@ -54,6 +55,17 @@ public:
     return JumpTables;
   }
   
+  /// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
+  /// the jump tables to branch to New instead.
+  void ReplaceMBBInJumpTables(MachineBasicBlock *Old, MachineBasicBlock *New) {
+    for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) {
+      MachineJumpTableEntry &JTE = JumpTables[i];
+      for (unsigned j = 0, e = JTE.MBBs.size(); j != e; ++j)
+        if (JTE.MBBs[j] == Old)
+          JTE.MBBs[j] = New;
+    }
+  }
+  
   /// getEntrySize - returns the size of an individual field in a jump table 
   unsigned getEntrySize() const;