[Mesa-dev] [PATCH] i965/gen6: Don't allow SIMD16 dispatch in 4x PERPIXEL mode with computed depth.

Paul Berry stereotype441 at gmail.com
Tue Nov 5 12:27:09 PST 2013

On 5 November 2013 12:13, Chris Forbes <chrisf at ijw.co.nz> wrote:

> Unfortunate :(
> Is the bad behavior from violating this restriction observable?

That's unclear.  Sometimes restrictions like this wind up in the hardware
docs because a hardware bug was found, in which case yes, the bad behaviour
is definitely observable.  Other times restrictions like these arise out of
deliberate simplifying assumptions that were made during hardware design,
in which case it's possible that violating the restriction is benign, but
it's really hard to tell for sure without a vast validation effort.  The
hardware docs rarely distinguish between these two possibilities.

I don't really have a good guess as to what the bad behaviour is in this
particular case.

> In any case, Reviewed-by: Chris Forbes <chrisf at ijw.co.nz>
> On Wed, Nov 6, 2013 at 7:43 AM, Eric Anholt <eric at anholt.net> wrote:
> > Paul Berry <stereotype441 at gmail.com> writes:
> >
> >> Hardware docs say we can only use SIMD8 dispatch in this condition.
> >
> > Reviewed-by: Eric Anholt <eric at anholt.net>
> >
> > _______________________________________________
> > mesa-dev mailing list
> > mesa-dev at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/mesa-dev
> >
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/mesa-dev/attachments/20131105/e71e7459/attachment.html>

More information about the mesa-dev mailing list