[PATCH] D71726: Let clang atomic builtins fetch add/sub support floating point types

[John McCall via Phabricator via cfe-commits]

rjmccall added a comment.

> Yes, there are no generically available libcalls for atomic float math -- but that's okay -- let LLVM handle transform into a cmpxchg loop when required.

I suspect Yaxun's target cannot provide libcalls at all, which is why he wants to diagnose up-front.  But I agree that we should be thinking about this uniformly, and that his target should be diagnosing *all* unsupported atomics.


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  https://reviews.llvm.org/D71726/new/

https://reviews.llvm.org/D71726