diff --git a/llvm/lib/CodeGen/LatencyPriorityQueue.cpp b/llvm/lib/CodeGen/LatencyPriorityQueue.cpp
index 8ffd51a..d2130cc 100644
--- a/llvm/lib/CodeGen/LatencyPriorityQueue.cpp
+++ b/llvm/lib/CodeGen/LatencyPriorityQueue.cpp
@@ -139,3 +139,14 @@
     std::swap(*I, Queue.back());
   Queue.pop_back();
 }
+
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+LLVM_DUMP_METHOD void LatencyPriorityQueue::dump(ScheduleDAG *DAG) const {
+  dbgs() << "Latency Priority Queue\n";
+  dbgs() << "  Number of Queue Entries: " << Queue.size() << "\n";
+  for (auto const &SU : Queue) {
+    dbgs() << "    ";
+    SU->dump(DAG);
+  }
+}
+#endif