Fix a few cases where the scheduler is not checking for phys reg copies. The scheduling node may have a NULL DAG node, yuck.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122544 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ScheduleDAG.cpp b/lib/CodeGen/ScheduleDAG.cpp
index 02e398f..83f2dd0 100644
--- a/lib/CodeGen/ScheduleDAG.cpp
+++ b/lib/CodeGen/ScheduleDAG.cpp
@@ -36,7 +36,7 @@
/// getInstrDesc helper to handle SDNodes.
const TargetInstrDesc *ScheduleDAG::getNodeDesc(const SDNode *Node) const {
- if (!Node->isMachineOpcode()) return NULL;
+ if (!Node || !Node->isMachineOpcode()) return NULL;
return &TII->get(Node->getMachineOpcode());
}