[PATCH] D72579: Evaluate __{c11_,}atomic_is_lock_free to 0 (avoid libcall) if larger than MaxAtomicPromoteWidth

[JF Bastien via Phabricator via cfe-commits]

jfb added a subscriber: jwakely.
jfb added a comment.

This changes the expression to a constant expression as well, right? You should point this out in the commit message.

The divergence with GCC is unfortunate, @jwakely do you think you'd be able to get GCC to match this behavior as well? It's technically a breaking change, but I doubt it matters in practice. It might also break code when newer architectures come in (if they have larger atomics) but again I think that's fine.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D72579/new/

https://reviews.llvm.org/D72579