[Mesa-dev] [PATCH] st/mesa: remove copy-propagation pass

[Tom Stellard]

On Wed, Mar 25, 2015 at 04:35:03PM -0400, Ilia Mirkin wrote:
> On Wed, Mar 25, 2015 at 4:27 PM, Dave Airlie <airlied at gmail.com> wrote:
> > On 26 March 2015 at 06:07, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> >> So.... what do you do when someone goes to shadertoy.com which on
> >> average uses 1000 temps?
> >
> > Fall over in a heap, like every other driver on shadertoy,
> 
> nouveau (nv50/nvc0) tends to do pretty well. There's one particular
> shader that ends up being shifted over for reasons unknown, but no
> compilation failures. i965 tends to do OK too, although I've seen
> weird rendering artifacts, although those could well be due to the
> shaders relying on unspecified behaviour.
> 
> >
> > This would be raelly bad for r600g in its present state, since it
> > doesn't go TGSI->SB yet, and thus has a TEMP limit that this would
> > only make worse.
> 
> D'oh, right, r600 relies on there being no more than 124 or 128
> registers. Forgot about that.
> 
> >
> > so Nak from me.
> >
> > Dave.
> 
> So I suppose you want to fix the copy_propagation issue? :)
> 

Can you add a flag for drivers to disable it?

-Tom

>   -ilia
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