On 01/06/17 02:45, Marek Olšák wrote:
On Tue, May 23, 2017 at 12:07 AM, Timothy Arceri <tarc...@itsqueeze.com> wrote:
3. The GLSL IR opts are both slow and not always optimal (possibly
transforming the code to something that's harder to opt later), but due to
uniform/varying optimisation requirements some optimisations are required
*before* we can do validation. With NIR we have an opportunity to do these
optimisations in NIR either by building a nir based linker for the final
linking stage (uniform/varying validation/location assignment) or by a
little bit of back and forth of information between NIR and GLSL IR. This is
something that can't really be done with LLVM/Gallium. I was working towards
this while at Collabora.
If you really want to have a NIR-based linker for all drivers, the
easiest way to get there is to add NIR-to-TGSI (for Gallium) and
NIR-to-MESA-IR (for old classic drivers).
Marek
Well I'm not really working on this, I gave Elie a list of what was
remaining to do, but not sure if he plans to work on it.
There idea of replacing MESA-IR with NIR (rather than a conversion pass)
has come up a few times but nothing has come of it. I think Matt was
looking at it at one point. IMO it would be safer/a better use of time
to just branch off the old classic drivers ... but seems like that's off
the tables for now.
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