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authorAlyssa Rosenzweig <[email protected]>2019-12-17 19:05:35 -0500
committerMarge Bot <[email protected]>2019-12-19 15:22:39 +0000
commit5710250074a066288c0ed44fd796baa0c4d0f42b (patch)
tree6cf56bd9100ac1848134afe0178a5eb97bd5eef2 /.gitlab-ci/build-piglit.sh
parent13b4e9adcfd60eb704528c637a8acb9651bc280c (diff)
pan/midgard: Add uniform/work heuristic
Uniform/work registers are partitioned on a shader-by-shader basis as determined by the compiler. We add a simple heuristic here running before scheduling that prioritizes mitigating spilling at all costs. A more sophisticated heuristic should run *after* scheduling, doing a dry run of the register allocator itself to determine spilling. Fitting this into our current scheduling model is difficult, so while this heuristic does hurt some shaders, overall the results are acceptable: total instructions in shared programs: 50065 -> 38747 (-22.61%) instructions in affected programs: 37187 -> 25869 (-30.44%) helped: 59 HURT: 77 helped stats (abs) min: 1 max: 757 x̄: 198.46 x̃: 151 helped stats (rel) min: 0.48% max: 62.89% x̄: 32.95% x̃: 36.27% HURT stats (abs) min: 1 max: 9 x̄: 5.08 x̃: 6 HURT stats (rel) min: 0.92% max: 14.29% x̄: 6.71% x̃: 4.60% 95% mean confidence interval for instructions value: -111.15 -55.29 95% mean confidence interval for instructions %-change: -14.33% -6.67% Instructions are helped. total bundles in shared programs: 30606 -> 19157 (-37.41%) bundles in affected programs: 23907 -> 12458 (-47.89%) helped: 58 HURT: 74 helped stats (abs) min: 6 max: 757 x̄: 203.09 x̃: 152 helped stats (rel) min: 5.19% max: 77.00% x̄: 49.38% x̃: 53.79% HURT stats (abs) min: 1 max: 9 x̄: 4.46 x̃: 5 HURT stats (rel) min: 1.85% max: 26.32% x̄: 11.70% x̃: 9.57% 95% mean confidence interval for bundles value: -115.46 -58.01 95% mean confidence interval for bundles %-change: -20.87% -9.41% Bundles are helped. total quadwords in shared programs: 31305 -> 32027 (2.31%) quadwords in affected programs: 20471 -> 21193 (3.53%) helped: 0 HURT: 133 HURT stats (abs) min: 1 max: 9 x̄: 5.43 x̃: 5 HURT stats (rel) min: 0.76% max: 15.15% x̄: 5.47% x̃: 4.65% 95% mean confidence interval for quadwords value: 5.00 5.86 95% mean confidence interval for quadwords %-change: 4.85% 6.08% Quadwords are HURT. total registers in shared programs: 2256 -> 2545 (12.81%) registers in affected programs: 708 -> 997 (40.82%) helped: 0 HURT: 95 HURT stats (abs) min: 1 max: 8 x̄: 3.04 x̃: 3 HURT stats (rel) min: 12.50% max: 100.00% x̄: 39.41% x̃: 37.50% 95% mean confidence interval for registers value: 2.64 3.45 95% mean confidence interval for registers %-change: 34.62% 44.19% Registers are HURT. total threads in shared programs: 1776 -> 1709 (-3.77%) threads in affected programs: 134 -> 67 (-50.00%) helped: 0 HURT: 67 HURT stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1 HURT stats (rel) min: 50.00% max: 50.00% x̄: 50.00% x̃: 50.00% 95% mean confidence interval for threads value: -1.00 -1.00 95% mean confidence interval for threads %-change: -50.00% -50.00% Threads are HURT. total spills in shared programs: 3868 -> 2 (-99.95%) spills in affected programs: 3868 -> 2 (-99.95%) helped: 60 HURT: 0 total fills in shared programs: 6456 -> 4 (-99.94%) fills in affected programs: 6456 -> 4 (-99.94%) helped: 60 HURT: 0 Signed-off-by: Alyssa Rosenzweig <[email protected]> Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3150> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3150>
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