Ian Romanick
6377e8fd29
Per discussion in #10727, removing phis breaks LCSSA form which in turn
invalidates divergence analysis.
shader-db:
All Skylake and newer platforms had similar results. (Ice Lake shown)
total instructions in shared programs: 20299612 -> 20299695 (<.01%)
instructions in affected programs: 20829 -> 20912 (0.40%)
helped: 6 / HURT: 13
total cycles in shared programs: 842149085 -> 842148399 (<.01%)
cycles in affected programs: 15146222 -> 15145536 (<.01%)
helped: 40 / HURT: 45
fossil-db:
All Intel platforms had similar results. (Ice Lake shown)
Totals:
Instrs: 165505077 -> 165505603 (+0.00%); split: -0.00%, +0.00%
Cycles: 15144183575 -> 15144235695 (+0.00%); split: -0.00%, +0.00%
Spill count: 45213 -> 45220 (+0.02%)
Fill count: 74166 -> 74184 (+0.02%)
Totals from 94 (0.01% of 656116) affected shaders:
Instrs: 263079 -> 263605 (+0.20%); split: -0.00%, +0.20%
Cycles: 28411487 -> 28463607 (+0.18%); split: -0.18%, +0.37%
Spill count: 3474 -> 3481 (+0.20%)
Fill count: 6713 -> 6731 (+0.27%)
Fixes: 6dbb5f1e07 ("intel/fs: rerun divergence analysis prior to convert_from_ssa")
Closes: #10727
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28136>
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