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

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

On other architectures which have 32-bit atomics, but not 8 and 16-bit atomics, it's generally possible to lower smaller operations using a 32-bit cmpxchg loop.  Does that not work on RISCV for some reason?


https://reviews.llvm.org/D47553