[Mesa-dev] Loop- and conditional-safe TGSI register merging

[Dave Airlie]

> I've rewritten the core of the register merging algorithm to be able to cope
> in the presence of (almost) arbitrarily nested loop and conditional
> structures. With this patch (tested on master), the Pixmark tests finally
> work just fine and some of the shadertoy demos have started working for me,
> too. I had been using this patch on top of Mesa 10.1.x and 10.2.x for several
> weeks now in daily use (including 3D gaming) and have seen no regressions.
> I'm unfortunately unable to run piglit at all as it fails the sanity check
> due to some mysterious z-buffer readback inaccuracy.

Don't worry about that bit so much, run piglit gpu.py, apply patch, rerun,
compare for any regressions.

though I'm not so sure if rv670 survives a piglit run, you can also run against
softpipe or llvmpipe, as this should affect those as well in theory.

Dave.