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SubjectRe: thread_info implementation

> On another topic, I'm considering having $8 continue to be current
> and using the two-insn stack mask to get current_thread_info and
> measuring the size difference that makes.

This is what paulus has done for ppc32 and what I have shamelessly
copied for ppc64. I was more comfortable doing that then requiring a
load for each use of current.

Anton
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