[Xen-devel] Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable

[Andreas Kleen <ak@xxxxxxx>]

Am Di 20.03.2007 06:54 schrieb Jeremy Fitzhardinge <jeremy@xxxxxxxx>:

> Zachary Amsden wrote:
> > For VMI, the default clobber was "cc", and you need a way to allow
> > at
> > least that, because saving and restoring flags is too expensive on
> > x86.
>
> According to lore (Andi, I think), asm() always clobbers cc.

asm with input and/or output. I'm not sure about asms without that.

-Andi



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