Re: [PATCH 1/2] ARM: copypage-fa: add kto and kfrom to input operands list

[Robin Murphy]

On 06/11/2018 04:49, Nicolas Pitre wrote:
[...]
> > r3 and r5 are not used above, so no need to have them in the clobber
> > list.
>
> They are used. ldrd and strd instructions always use a pair of
> consecutive registers. So "ldrd r2, ..." loads into r2-r3 and "ldrd r4, ..."
> loads into r4-r5.

FWIW, since we should now be enabling unified syntax everywhere, I guess 
we could probably rewrite all those ldrd/strd to the UAL 3-operand form 
- i.e. "ldrd r2, r3, [...]" - if we really cared for the extra clarity.

Robin.