add a new method.

llvm-svn: 20293

2 files changed, 16 insertions, 1 deletions

diff --git a/llvm/include/llvm/BasicBlock.h b/llvm/include/llvm/BasicBlock.h
index 2b1c3e0eea7..2b7b6301365 100644
--- a/llvm/include/llvm/BasicBlock.h
+++ b/llvm/include/llvm/BasicBlock.h
@@ -107,7 +107,12 @@ public:
   ///
   void eraseFromParent();
 
-
+  /// getSinglePredecessor - If this basic block has a single predecessor block,
+  /// return the block, otherwise return a null pointer.
+  BasicBlock *getSinglePredecessor();
+  const BasicBlock *getSinglePredecessor() const {
+    return const_cast<BasicBlock*>(this)->getSinglePredecessor();
+  }
 
   //===--------------------------------------------------------------------===//
   /// Instruction iterator methods
diff --git a/llvm/lib/VMCore/BasicBlock.cpp b/llvm/lib/VMCore/BasicBlock.cpp
index b22a54162b9..92bdc50e781 100644
--- a/llvm/lib/VMCore/BasicBlock.cpp
+++ b/llvm/lib/VMCore/BasicBlock.cpp
@@ -129,6 +129,16 @@ void BasicBlock::dropAllReferences() {
     I->dropAllReferences();
 }
 
+/// getSinglePredecessor - If this basic block has a single predecessor block,
+/// return the block, otherwise return a null pointer.
+BasicBlock *BasicBlock::getSinglePredecessor() {
+  pred_iterator PI = pred_begin(this), E = pred_end(this);
+  if (PI == E) return 0;         // No preds.
+  BasicBlock *ThePred = *PI;
+  ++PI;
+  return (PI == E) ? ThePred : 0 /*multiple preds*/;
+}
+
 // removePredecessor - This method is used to notify a BasicBlock that the
 // specified Predecessor of the block is no longer able to reach it.  This is
 // actually not used to update the Predecessor list, but is actually used to