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SubjectRe: [PATCH] take 2 of the tr-based current

> Hmmm. Would adding a fake global input help with that? Something like a
> "g" (aligned_data) input.

Yep thats what Alan ended up doing, it needed a dummy memory constraint
to prevent gcc over optimising:

__asm__ ("mfspr %0,0x113; #%1"
: "=r" (rval)
: "m" ((int *) 0));

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