1 files changed, 3 insertions, 2 deletions
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index 8b54e656..fd0fa31 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -173,7 +173,7 @@ public:
       HazardRec = STI.getInstrInfo()->CreateTargetHazardRecognizer(&STI, this);
   }
 
-  ~ScheduleDAGRRList() {
+  ~ScheduleDAGRRList() override {
     delete HazardRec;
     delete AvailableQueue;
   }
@@ -1423,9 +1423,10 @@ SUnit *ScheduleDAGRRList::PickNodeToScheduleBottomUp() {
 
       // If one or more successors has been unscheduled, then the current
       // node is no longer available.
-      if (!TrySU->isAvailable)
+      if (!TrySU->isAvailable || !TrySU->NodeQueueId)
         CurSU = AvailableQueue->pop();
       else {
+        // Available and in AvailableQueue
         AvailableQueue->remove(TrySU);
         CurSU = TrySU;
       }