> > +copyback_page:
> > +   movq    24(%rax), %r9
> > +   xorl    %r8d, %r8d
> > +
> 
> Are you sure %r8 and %r9 are caller-saved? I'd use low registers if I
> were you, they look nincer and generate shorter opcodes ;-).

They are.

-Andi
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