add a simple helper method.

llvm-svn: 83745

2 files changed, 10 insertions, 0 deletions

diff --git a/llvm/include/llvm/Transforms/Utils/SSAUpdater.h b/llvm/include/llvm/Transforms/Utils/SSAUpdater.h
index c697d048f1f..11b90d42677 100644
--- a/llvm/include/llvm/Transforms/Utils/SSAUpdater.h
+++ b/llvm/include/llvm/Transforms/Utils/SSAUpdater.h
@@ -60,6 +60,10 @@ public:
   /// AddAvailableValue - Indicate that a rewritten value is available at the
   /// end of the specified block with the specified value.
   void AddAvailableValue(BasicBlock *BB, Value *V);
+
+  /// HasValueForBlock - Return true if the SSAUpdater already has a value for
+  /// the specified block.
+  bool HasValueForBlock(BasicBlock *BB) const;
   
   /// GetValueAtEndOfBlock - Construct SSA form, materializing a value that is
   /// live at the end of the specified block.
diff --git a/llvm/lib/Transforms/Utils/SSAUpdater.cpp b/llvm/lib/Transforms/Utils/SSAUpdater.cpp
index 2fb742bb445..780ee263894 100644
--- a/llvm/lib/Transforms/Utils/SSAUpdater.cpp
+++ b/llvm/lib/Transforms/Utils/SSAUpdater.cpp
@@ -56,6 +56,12 @@ void SSAUpdater::Initialize(Value *ProtoValue) {
   PrototypeValue = ProtoValue;
 }
 
+/// HasValueForBlock - Return true if the SSAUpdater already has a value for
+/// the specified block.
+bool SSAUpdater::HasValueForBlock(BasicBlock *BB) const {
+  return getAvailableVals(AV).count(BB);
+}
+
 /// AddAvailableValue - Indicate that a rewritten value is available in the
 /// specified block with the specified value.
 void SSAUpdater::AddAvailableValue(BasicBlock *BB, Value *V) {