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119801e647
Intel GPUs have a saturate destination modifier, and brw_fs_opt_saturate_propagation tries to replace explicit saturate operations with this destination modifier. That pass is limited in several ways. If the source of the explicit saturate is in a different block or if the source of the explicit saturate is live after the explicit saturate, brw_fs_opt_saturate_propagation will be unable to make progress. This optimization exists to help brw_fs_opt_saturate_propagation make more progress. It tries to move NIR fsat instructions to the same block that contains the definition of its source. It does this only in cases where it will not create additional live values. It also attempts to do this only in cases where the explicit saturate will ultimiately be converted to a destination modifier. v2: Fix metadata_preserve when theres no progress and use nir_metadata_control_flow when there is progress. All suggested by Alyssa. v3: Fix a typo in the file header comment. Noticed by Ken. Don't require nir_metadata_instr_index. Use nir_def_rewrite_uses_after instead of open-coding something slightly more specific. Both suggested by Ken. shader-db: All Intel platforms had similar results. (Meteor Lake shown) total instructions in shared programs: 19733645 -> 19733028 (<.01%) instructions in affected programs: 193300 -> 192683 (-0.32%) helped: 246 HURT: 1 helped stats (abs) min: 2 max: 48 x̄: 2.51 x̃: 2 helped stats (rel) min: 0.18% max: 0.39% x̄: 0.33% x̃: 0.34% HURT stats (abs) min: 1 max: 1 x̄: 1.00 x̃: 1 HURT stats (rel) min: 0.31% max: 0.31% x̄: 0.31% x̃: 0.31% 95% mean confidence interval for instructions value: -2.87 -2.13 95% mean confidence interval for instructions %-change: -0.34% -0.32% Instructions are helped. total cycles in shared programs: 916180971 -> 916264656 (<.01%) cycles in affected programs: 30197180 -> 30280865 (0.28%) helped: 194 HURT: 142 helped stats (abs) min: 1 max: 21251 x̄: 872.75 x̃: 19 helped stats (rel) min: <.01% max: 23.17% x̄: 2.59% x̃: 0.23% HURT stats (abs) min: 1 max: 28058 x̄: 1781.68 x̃: 399 HURT stats (rel) min: <.01% max: 37.21% x̄: 4.85% x̃: 1.63% 95% mean confidence interval for cycles value: -196.84 694.97 95% mean confidence interval for cycles %-change: -0.17% 1.27% Inconclusive result (value mean confidence interval includes 0). fossil-db: Meteor Lake, DG2, and Tiger Lake had similar results. (Meteor Lake shown) Totals: Instrs: 151512021 -> 151511351 (-0.00%); split: -0.00%, +0.00% Cycle count: 17209013596 -> 17209840995 (+0.00%); split: -0.02%, +0.02% Max live registers: 32013312 -> 32013549 (+0.00%) Max dispatch width: 5512304 -> 5512136 (-0.00%) Totals from 774 (0.12% of 630172) affected shaders: Instrs: 1559285 -> 1558615 (-0.04%); split: -0.05%, +0.01% Cycle count: 1312656268 -> 1313483667 (+0.06%); split: -0.24%, +0.30% Max live registers: 82195 -> 82432 (+0.29%) Max dispatch width: 6664 -> 6496 (-2.52%) Ice Lake Totals: Instrs: 151416791 -> 151416137 (-0.00%); split: -0.00%, +0.00% Cycle count: 15162468885 -> 15163298824 (+0.01%); split: -0.00%, +0.01% Max live registers: 32471367 -> 32471603 (+0.00%) Max dispatch width: 5623752 -> 5623712 (-0.00%) Totals from 733 (0.12% of 635598) affected shaders: Instrs: 877965 -> 877311 (-0.07%); split: -0.09%, +0.01% Cycle count: 190763628 -> 191593567 (+0.44%); split: -0.21%, +0.64% Max live registers: 72067 -> 72303 (+0.33%) Max dispatch width: 6216 -> 6176 (-0.64%) Skylake Totals: Instrs: 140794845 -> 140794075 (-0.00%); split: -0.00%, +0.00% Cycle count: 14665159301 -> 14665320514 (+0.00%); split: -0.00%, +0.01% Max live registers: 31783341 -> 31783662 (+0.00%); split: -0.00%, +0.00% Totals from 659 (0.11% of 625670) affected shaders: Instrs: 829061 -> 828291 (-0.09%); split: -0.09%, +0.00% Cycle count: 185478478 -> 185639691 (+0.09%); split: -0.33%, +0.41% Max live registers: 67491 -> 67812 (+0.48%); split: -0.01%, +0.48% Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29774> |
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