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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
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@ -134,6 +134,7 @@ static const Value *getUnderlyingObjectForInstr(const MachineInstr *MI,
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}
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void ScheduleDAGInstrs::StartBlock(MachineBasicBlock *BB) {
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LoopRegs.Deps.clear();
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if (MachineLoop *ML = MLI.getLoopFor(BB))
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if (BB == ML->getLoopLatch()) {
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MachineBasicBlock *Header = ML->getHeader();
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@ -48,7 +48,8 @@ namespace llvm {
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/// VisitLoop - Clear out any previous state and analyze the given loop.
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///
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void VisitLoop(const MachineLoop *Loop) {
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Deps.clear();
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assert(Deps.empty() && "stale loop dependencies");
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MachineBasicBlock *Header = Loop->getHeader();
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SmallSet<unsigned, 8> LoopLiveIns;
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for (MachineBasicBlock::livein_iterator LI = Header->livein_begin(),
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