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Disable MachineSink on convergent operations, similar to how IR Sink is

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restricted.  No test because no in-tree target currently has convergent
MachineInstr's.

llvm-svn: 238763
This commit is contained in:
Owen Anderson 2015-06-01 17:26:30 +00:00
parent 15d1805504
commit 55313d21dc
1 changed files with 4 additions and 0 deletions
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llvm/lib/CodeGen/MachineSink.cpp
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@ -655,6 +655,10 @@ bool MachineSinking::SinkInstruction(MachineInstr *MI, bool &SawStore) {
if (!MI->isSafeToMove(AA, SawStore))
return false;
// Convergent operations may only be moved to control equivalent locations.
if (MI->isConvergent())
return false;
// FIXME: This should include support for sinking instructions within the
// block they are currently in to shorten the live ranges. We often get
// instructions sunk into the top of a large block, but it would be better to