diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index db7873b..664cf18 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -602,6 +602,9 @@
   bool IsCatchBlock() const { return is_catch_block_; }
   void SetIsCatchBlock() { is_catch_block_ = true; }
 
+  bool EndsWithIf() const;
+  bool HasSinglePhi() const;
+
  private:
   HGraph* graph_;
   GrowableArray<HBasicBlock*> predecessors_;
@@ -624,6 +627,31 @@
   DISALLOW_COPY_AND_ASSIGN(HBasicBlock);
 };
 
+// Iterates over the LoopInformation of all loops which contain 'block'
+// from the innermost to the outermost.
+class HLoopInformationOutwardIterator : public ValueObject {
+ public:
+  explicit HLoopInformationOutwardIterator(const HBasicBlock& block)
+      : current_(block.GetLoopInformation()) {}
+
+  bool Done() const { return current_ == nullptr; }
+
+  void Advance() {
+    DCHECK(!Done());
+    current_ = current_->GetHeader()->GetDominator()->GetLoopInformation();
+  }
+
+  HLoopInformation* Current() const {
+    DCHECK(!Done());
+    return current_;
+  }
+
+ private:
+  HLoopInformation* current_;
+
+  DISALLOW_COPY_AND_ASSIGN(HLoopInformationOutwardIterator);
+};
+
 #define FOR_EACH_CONCRETE_INSTRUCTION(M)                                \
   M(Add, BinaryOperation)                                               \
   M(And, BinaryOperation)                                               \