> On Oct 13, 2016, at 2:04 PM, Alexis <abeingess...@apple.com> wrote:
> Correct me if I’m wrong, but aren’t all kernel addresses negative on x64 and 
> AArch64? Would this then mean any attempt to use Swift in kernel-space 
> requires a distinct ABI?

That's correct, but we'd likely already have to have a separate "kernel" ABI 
due to our assumptions about spare bits in pointers. It also seems unlikely to 
me that kernel developers would want to use our refcounting scheme as is.

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