b-sumner added a comment.

In D148796#4284504 <https://reviews.llvm.org/D148796#4284504>, @rampitec wrote:

> We used to support it that way and decided just not doing it. It is very hard 
> to explain why a supported atomic results in error. Someone who really needs 
> it can use intrinsic.

I tend to agree.  This oddity is probably best handled with an intrinsic.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D148796/new/

https://reviews.llvm.org/D148796

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