[Mesa-dev] r300 presubtract v2

Sven Arvidsson sa at whiz.se
Wed Sep 8 13:21:36 PDT 2010

On Tue, 2010-09-07 at 22:23 -0700, Tom Stellard wrote:
> Hi,
> I have just pushed a branching adding support for presubtract sources to
> my personal repo.  The branch contains peephole optimizations for all the
> presubtract operations except for 1 - 2 * src0.  I've tested this branch
> on an RV370 and an RV515 and both match the piglit results from master.
> The branch name is presub-rebase-v2 and you can check it out from here:
> git://anongit.freedesktop.org/~tstellar/mesa
> The changes in the branch touch almost every part of the compiler, so
> I'll wait a few days to push this to give people a chance to comment.
> I haven't done a lot of performance testing on this branch yet, so I'm
> not sure what the performance impact will be.  I'm hoping at the very
> least this will help fix some of the "too many instructions" bugs.

This seems to have regressed the game Shadowgrounds, I'm mostly just
getting a black screen. (It's working on master).

Should be reproducable with the demo:

Sven Arvidsson
PGP Key ID 760BDD22

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