diff --git a/include/llvm/CodeGen/SelectionDAG.h b/include/llvm/CodeGen/SelectionDAG.h
index 58f0d64792d..df695010bf1 100644
--- a/include/llvm/CodeGen/SelectionDAG.h
+++ b/include/llvm/CodeGen/SelectionDAG.h
@@ -395,14 +395,20 @@ public:
                           std::vector<SDNode*> *Deleted = 0);
   void ReplaceAllUsesWith(SDNode *From, const std::vector<SDOperand> &To,
                           std::vector<SDNode*> *Deleted = 0);
-  
-  
+
   /// DeleteNode - Remove the specified node from the system.  This node must
   /// have no referrers.
   void DeleteNode(SDNode *N);
   
   void dump() const;
 
+  /// InsertISelMapEntry - A helper function to insert a key / element pair
+  /// into a SDOperand to SDOperand map. This is added to avoid the map
+  /// insertion operator from being inlined.
+  static void InsertISelMapEntry(std::map<SDOperand, SDOperand> &Map,
+                                 SDNode *Key, unsigned KeyResNo,
+                                 SDNode *Element, unsigned ElementResNo);
+  
 private:
   void RemoveNodeFromCSEMaps(SDNode *N);
   SDNode *AddNonLeafNodeToCSEMaps(SDNode *N);
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 9c9df11bed2..23d1dc34cc1 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2748,3 +2748,12 @@ void SelectionDAG::dump() const {
   std::cerr << "\n\n";
 }
 
+/// InsertISelMapEntry - A helper function to insert a key / element pair
+/// into a SDOperand to SDOperand map. This is added to avoid the map
+/// insertion operator from being inlined.
+void SelectionDAG::InsertISelMapEntry(std::map<SDOperand, SDOperand> &Map,
+                                      SDNode *Key, unsigned KeyResNo,
+                                      SDNode *Element, unsigned ElementResNo) {
+  Map.insert(std::make_pair(SDOperand(Key, KeyResNo),
+                            SDOperand(Element, ElementResNo)));
+}