On Fri, May 8, 2015 at 6:36 AM, Kenneth Graunke <kenn...@whitecape.org> wrote:
> + # Multiplication by 4 comes up fairly often in indirect offset
> calculations.
> + # Some GPUs have weird integer multiplication limitations, but shifts
> should work
> + # equally well everywhere.
> + (('imul', 4, a), ('ishl', a, 2)),
Not sure what the cost of doing it this way, but really you want all
powers of 2... and also udiv -> shr. Since this is python, should be
easy enough to append onto that list. AFAIK all GPU's prefer a shift
over a mul. Adreno doen't have 32-bit imul in the first place (and no
idiv either).
In nouveau/codegen we just have a single check for whether the
immediate is a power of 2, perhaps that can be encoded here in some
way.
Cheers,
-ilia
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/mesa-dev
