> > While sync appears attractive as a quick hack to achieve this, I think it > > is liable to be abused, and cause us serious pain long-term. If you need > > an easy solution then use ld/st (as with ARM VFP registers). If you want > > a good solution then fix whichever bit of TCG makes accessing a pair of > > registers horribly slow. We already have some support for this > > (concat_i32_i64). > > Could we please include it nevertheless? I don't want to see S390 TCG > and KVM targets not included because of this sync operation. > > If you like, add some big fat warning around it and maybe break > compilation if anyone but the s390 target uses that sync op, but let's > not keep a whole target from inclusion because of a single feature that > _might_ one day affect others.
I'd rather not include sync, and instead use the explicit ld/st code you already wrote. Paul
