PostRA scheduler fix. Clear stale loop dependencies.
Fixes <rdar://problem/10235725>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141357 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ScheduleDAGInstrs.cpp b/lib/CodeGen/ScheduleDAGInstrs.cpp
index c5647fb..34b8ab0 100644
--- a/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -134,6 +134,7 @@
}
void ScheduleDAGInstrs::StartBlock(MachineBasicBlock *BB) {
+ LoopRegs.Deps.clear();
if (MachineLoop *ML = MLI.getLoopFor(BB))
if (BB == ML->getLoopLatch()) {
MachineBasicBlock *Header = ML->getHeader();
diff --git a/lib/CodeGen/ScheduleDAGInstrs.h b/lib/CodeGen/ScheduleDAGInstrs.h
index 6e672f4..666bdf5 100644
--- a/lib/CodeGen/ScheduleDAGInstrs.h
+++ b/lib/CodeGen/ScheduleDAGInstrs.h
@@ -48,7 +48,8 @@
/// VisitLoop - Clear out any previous state and analyze the given loop.
///
void VisitLoop(const MachineLoop *Loop) {
- Deps.clear();
+ assert(Deps.empty() && "stale loop dependencies");
+
MachineBasicBlock *Header = Loop->getHeader();
SmallSet<unsigned, 8> LoopLiveIns;
for (MachineBasicBlock::livein_iterator LI = Header->livein_begin(),