1 files changed, 10 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index c93ef4dd467..d6368047bcd 100644
--- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -435,6 +435,13 @@ void ScheduleDAGRRList::AdvancePastStalls(SUnit *SU) {
 /// Record this SUnit in the HazardRecognizer.
 /// Does not update CurCycle.
 void ScheduleDAGRRList::EmitNode(SUnit *SU) {
+  if (!EnableSchedCycles || HazardRec->getMaxLookAhead() == 0)
+    return;
+
+  // Check for phys reg copy.
+  if (!SU->getNode())
+    return;
+
   switch (SU->getNode()->getOpcode()) {
   default:
     assert(SU->getNode()->isMachineOpcode() &&
@@ -645,13 +652,13 @@ static bool isOperandOf(const SUnit *SU, SDNode *N) {
 /// CopyAndMoveSuccessors - Clone the specified node and move its scheduled
 /// successors to the newly created node.
 SUnit *ScheduleDAGRRList::CopyAndMoveSuccessors(SUnit *SU) {
-  if (SU->getNode()->getGluedNode())
-    return NULL;
-
   SDNode *N = SU->getNode();
   if (!N)
     return NULL;
 
+  if (SU->getNode()->getGluedNode())
+    return NULL;
+
   SUnit *NewSU;
   bool TryUnfold = false;
   for (unsigned i = 0, e = N->getNumValues(); i != e; ++i) {