Hi Wilco, (and thanks everyone for the interesting input on this)
> On 17 Dec 2018, at 14:55, Wilco Dijkstra <wilco.dijks...@arm.com> wrote: > > The AArch64 ABI defines x18 as platform specific: [...] > Using x9 would make its use as an extra argument clearer. 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). Olivier
