hfinkel added a comment.

In https://reviews.llvm.org/D24688#639158, @jyknight wrote:

> Since this requires everyone generating llvm IR to add this module attribute 
> for optimal codegen, it should be documented in release notes and the 
> LangRef, I think.


And, for something like this, here: 
http://llvm.org/docs/Frontend/PerformanceTips.html

> I mean: it's unfortunate that it's needed at all, but at the very least it 
> should be possible for people to find out about it.




https://reviews.llvm.org/D24688



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