[PATCH] D49440: [WebAssembly] Enable atomic expansion for unsupported atomicrmws

[Heejin Ahn via Phabricator via llvm-commits]

aheejin added a comment.

For the same reason described here <https://reviews.llvm.org/D49195#1159723>, in truncation/extension involving i64, we currently are not able to use the truncate/extend version of the `cmpxchg` instruction, so it is little suboptimal. Will solve this in a separate CL.


Repository:
  rL LLVM

https://reviews.llvm.org/D49440