[ping] Change static chain to r11 on aarch64

Wilco Dijkstra Wilco.Dijkstra@arm.com
Fri Dec 21 18:02:00 GMT 2018

Hi Olivier,

> I'm experimenting with the idea of adjusting the
> stack probing code using r9 today, to see if it could
> save/restore that reg if it happens to be the static chain
> as well.
> If that can be made to work, maybe that would be a better
> alternative than just swapping and have the stack probing
> code use r10 and r11 instead (1 fewer register with dedicated
> use).

Remember these are just temporaries for use in the prolog and epilog -
there is no need to save/restore the static base. Setting static chain
to x9 and the temporaries to x10/x11 is the simplest solution. We
can separately look at why the prolog uses more than a single



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