Re: [Qemu-devel] [PATCH 0/2] simplify global register save/restore

[Paolo Bonzini]

On 02/26/2010 12:30 PM, Paul Brook wrote:
> > Since b567b38 (target-arm: remove T0 and T1, 2009-10-16) the only global
> > register that is actually used is AREG0, so the complexity of
> > hostregs_helper.h is unwarranted.
> >
> > Let's just say that env should be the only global register.  AREG1 and
> > AREG2 in principle could still be used to work around bad register
> > allocation in GCC, so I'm leaving them in dyngen-exec.h.
>
> I think AREG[12] should be removed too. If we aren't saving them then they
> can't be safely used.

You could still use them for local register variables, but I can prepare 
a patch to remove them (unless you do that yourself).

Paolo