Add some methods.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19817 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 0 deletions

diff --git a/include/llvm/Analysis/DataStructure/DSGraph.h b/include/llvm/Analysis/DataStructure/DSGraph.h
index 5efdde9a69..bc5f8242c1 100644
--- a/include/llvm/Analysis/DataStructure/DSGraph.h
+++ b/include/llvm/Analysis/DataStructure/DSGraph.h
@@ -55,6 +55,11 @@ public:
 
   void erase(Value *V) { erase(find(V)); }
 
+  void eraseIfExists(Value *V) {
+    iterator I = find(V);
+    if (I != end()) erase(I);
+  }
+
   /// replaceScalar - When an instruction needs to be modified, this method can
   /// be used to update the scalar map to remove the old and insert the new.
   ///
@@ -65,6 +70,14 @@ public:
     erase(I);
   }
 
+  /// copyScalarIfExists - If Old exists in the scalar map, make New point to
+  /// whatever Old did.
+  void copyScalarIfExists(Value *Old, Value *New) {
+    iterator I = find(Old);
+    if (I != end())
+      ValueMap.insert(std::make_pair(New, I->second));
+  }
+
   DSNodeHandle &operator[](Value *V) {
     std::pair<iterator,bool> IP = 
       ValueMap.insert(std::make_pair(V, DSNodeHandle()));