Jason Ekstrand
d3386e73c5
This fixes a serious performance issue with DXVK: https://github.com/doitsujin/dxvk/issues/937 This was caused by a recent change that to improve performance on RADV which back-fired on ANV and killed performance for some apps: https://github.com/doitsujin/dxvk/commit/e5a06d3f4a103a54cd4eb51970fedee405d1d698 Throwing in this bit of lowering lets us come along and CSE those UBO loads (or copy-prop for SSBO load) and get one load where we previously would have gotten several. VkPipeline-db results on Kaby Lake: total instructions in shared programs: 5115361 -> 5073185 (-0.82%) instructions in affected programs: 1754333 -> 1712157 (-2.40%) helped: 5331 HURT: 63 total cycles in shared programs: 2544501169 -> 2481144545 (-2.49%) cycles in affected programs: 2531058653 -> 2467702029 (-2.50%) helped: 9202 HURT: 4323 total loops in shared programs: 3340 -> 3331 (-0.27%) loops in affected programs: 9 -> 0 helped: 9 HURT: 0 total spills in shared programs: 3246 -> 3053 (-5.95%) spills in affected programs: 384 -> 191 (-50.26%) helped: 10 HURT: 5 total fills in shared programs: 4626 -> 4452 (-3.76%) fills in affected programs: 439 -> 265 (-39.64%) helped: 10 HURT: 5 All of the shaders with hurt spilling were in Rise of the Tomb Raider which also had shaders solidly helped in the spilling department. Not shown in those results (because I've not had success dumping the shaders) is Witcher 3 where this reduces spilling and improves over-all perf by around 20-25%. There were no shader-db changes. Apparently, this just isn't a pattern that happens in OpenGL. Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com> Cc: "19.0" mesa-stable@lists.freedesktop.org
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