[swift-dev] Having 64-bit swift_retain/release ignore all negative pointer values

John McCall rjmccall at apple.com
Thu Oct 13 16:30:56 CDT 2016

> On Oct 13, 2016, at 2:14 PM, Joe Groff via swift-dev <swift-dev at swift.org> wrote:
>> On Oct 13, 2016, at 2:04 PM, Alexis <abeingessner at 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.

This is exactly my thinking.


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