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[Xen-devel] Re: [patch] pae: tlbflush linear page table updates

To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Subject: [Xen-devel] Re: [patch] pae: tlbflush linear page table updates
From: Andi Kleen <ak@xxxxxxx>
Date: Fri, 12 Aug 2005 11:56:48 +0200
Cc: Gerd Knorr <kraxel@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, ak@xxxxxxx
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> "early clobber" is good to prevent output alias as input, if that output
> may be clobbered before input is used. However there seems no point to
> simply alias among inputs. Or else, the only way I can see is that
> compiler insert some extra lines in the middle of inline asm... Any
> benefit for this likelihood?

There can be cases e.g. when the inputs are dependent and you use
general enough constraints. e.g. one input can be %reg and the other
offset(%reg). In this case they will essentially alias. 


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