[PATCH] D47553: Add TargetLowering::shouldExpandAtomicToLibCall and query it from AtomicExpandPass

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

MachineOutliner doesn't do anything unless target-specific hooks say a transform is safe; it should be possible to guard against the possibility of outlining an ll/sc pair.


https://reviews.llvm.org/D47553