BillyONeal added a comment.

In https://reviews.llvm.org/D32265#732657, @jfb wrote:

> It looks like Billy is going to do something somewhat similar when he 
> rewrites it: https://twitter.com/jfbastien/status/855168230918307840
>  For now it's kinda `#define IS_LOCK_FREE ¯\_(ツ)_/¯`


Note that my rewrite of our <atomic> didn't touch the XXX_IS_LOCK_FREE macros. 
All of those for both implementations are hardcoded to 2 since any piece of 
hardware we ever plan to support has lock free ops for all those. I did add 
conditional DCAS support for amd64 though in v.Next.

Billy3


https://reviews.llvm.org/D32265



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