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

[Yaxun Liu via Phabricator via cfe-commits]

yaxunl added a comment.

In D71726#2165424 <https://reviews.llvm.org/D71726#2165424>, @jyknight wrote:

> Why not have clang always emit atomicrmw for floats, and let AtomicExpandPass handle legalizing that into integer atomics if necessary, rather than adding a target hook in clang?


Not all targets can legalize fp atomics by AtomicExpandPass. Some targets need library support.


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