implement a simple proof-of-concept optimization for

[oota-llvm.git] / include / llvm / ValueSymbolTable.h

diff --git a/include/llvm/ValueSymbolTable.h b/include/llvm/ValueSymbolTable.h
index 0240696821f482d168e78b1e2d95c970323910da..7497dae3c469b49cfb3090f255929f21e2209ca3 100644 (file)
--- a/include/llvm/ValueSymbolTable.h
+++ b/include/llvm/ValueSymbolTable.h
@@ -194,9 +194,15 @@ public:
 /// @name Mutators
 /// @{
 public:
-  /// insert - The method inserts a new entry into the stringmap.
+  /// insert - The method inserts a new entry into the stringmap. This will
+  /// replace existing entry, if any.
   void insert(StringRef Name,  NamedMDNode *Node) {
-    (void) mmap.GetOrCreateValue(Name, Node);
+    StringMapEntry<NamedMDNode *> &Entry = 
+      mmap.GetOrCreateValue(Name, Node);
+    if (Entry.getValue() != Node) {
+      mmap.remove(&Entry);
+      (void) mmap.GetOrCreateValue(Name, Node);
+    }
   }
   
   /// This method removes a NamedMDNode from the symbol table.