1ea987576d
In a fragment shader, r0 is written out with a special branch sequence. r0 is not a real register here, but essentially a pipeline register -- as such, it needs to be written out in full and on time, with hanging dependencies in the bundle. Otherwise, we break up the bundle, which costs an extra ALU cycle and adds a move. When the scheduler ran last thing, we could do this analysis within the scheduler. Now that RA can run after scheduling, that's no longer valid, so we remove the analysis and always break it up (at a performance penalty). Future work can add a post-RA/post-schedule pass to merge writeout blocks if possible. It's a bit of a low-priority next to fixing conformance regressions, of course. Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
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