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

[Andi Kleen <ak@xxxxxxx>]

> "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. 

-Andi

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel