jingham added a comment.

In D121348#3373170 <https://reviews.llvm.org/D121348#3373170>, @labath wrote:

> I don't think this is a peculiarity of the darwin ABI. I'm pretty sure i've 
> ran into this on the "sysv" ABI as well.
>
> If we're going to disallow this, then I think we should do the same for 
> ABISysV_arm64 as well -- it looks like an identical change to ABISysV_arm64 
> should suffice.

The ABI docs say "you aren't required to restore the value of x8 on function 
return"...  Not all that surprising everybody took the speed over debuggability 
option.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D121348/new/

https://reviews.llvm.org/D121348

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