Fix null reference creation in ScheduleDAGInstrs constructor call.
Both MachineLoopInfo and MachineDominatorTree may be null in ScheduleDAGMI
constructor call. It is undefined behavior to take references to these values.
This bug is reported by UBSan.
llvm-svn: 216118
diff --git a/llvm/lib/Target/Hexagon/HexagonMachineScheduler.cpp b/llvm/lib/Target/Hexagon/HexagonMachineScheduler.cpp
index 4c040bf..97c626f 100644
--- a/llvm/lib/Target/Hexagon/HexagonMachineScheduler.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonMachineScheduler.cpp
@@ -145,7 +145,7 @@
<< "********** MI Converging Scheduling VLIW BB#" << BB->getNumber()
<< " " << BB->getName()
<< " in_func " << BB->getParent()->getFunction()->getName()
- << " at loop depth " << MLI.getLoopDepth(BB)
+ << " at loop depth " << MLI->getLoopDepth(BB)
<< " \n");
buildDAGWithRegPressure();