Clear virtual registers after they are no longer referenced.

[oota-llvm.git] / lib / CodeGen / ScheduleDAGInstrs.cpp

diff --git a/lib/CodeGen/ScheduleDAGInstrs.cpp b/lib/CodeGen/ScheduleDAGInstrs.cpp
index b3349209a5d21e589d543f725c69f8e1d7469796..879b65f9d089c1044c7c365a0910226b7b17f1bf 100644 (file)
--- a/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -40,6 +40,8 @@ ScheduleDAGInstrs::ScheduleDAGInstrs(MachineFunction &mf,
     UnitLatencies(false), Defs(TRI->getNumRegs()), Uses(TRI->getNumRegs()),
     LoopRegs(MLI, MDT), FirstDbgValue(0) {
   DbgValues.clear();
+  assert(!(IsPostRA && MF.getRegInfo().getNumVirtRegs()) &&
+         "Virtual registers must be removed prior to PostRA scheduling");
 }
 
 /// Run - perform scheduling.