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4cd64165a3
When lowering cf we go out of SSA which translates phis into reg intrinsics. However when converting them back to SSA, initially single source phis now have an undef source leading to increased register pressure on the NAK side. This also hinders copy propagation as it's not designed to handle sources through phis yet. Totals from 50621 (4.17% of 1212873) affected shaders: CodeSize: 1605273744 -> 1621029728 (+0.98%); split: -0.34%, +1.32% Number of GPRs: 4673586 -> 4067935 (-12.96%); split: -12.97%, +0.01% SLM Size: 263428 -> 258176 (-1.99%) Static cycle count: 2599838439 -> 2586392435 (-0.52%); split: -1.11%, +0.59% Spills to memory: 23512 -> 15527 (-33.96%) Fills from memory: 23512 -> 15527 (-33.96%) Spills to reg: 64590 -> 57328 (-11.24%); split: -13.83%, +2.58% Fills from reg: 55559 -> 44319 (-20.23%); split: -22.66%, +2.42% Max warps/SM: 1189396 -> 1347600 (+13.30%) Reviewed-by: Mel Henning <mhenning@darkrefraction.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41042> |
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