Pavel Ondračka
41f1dd89a3
This lowers some of the bool-producing comparisons and following bcsels if the bool comparison results is only used in the bcsel. This is a temporary solution before we can fork ntt and optimize the pass sequence there. Right now if we have something like bcsel(a,b,0.0) we lower it to flrp in nir_lower_bool_to_float. The flrp goes to backend where it will be lowered to 2 MADs. However in this case with one of the arguments being a constant one MAD is enough. The backend can figure this out in the constant folding pass, however this is actually one of the last things we need it for. So if we do early translation of the bcsels, than the algebraic pass can clean it up and we can remove more backend code in the next patch. no significant change with RV370 shader-db: total instructions in shared programs: 82497 -> 82496 (<.01%) instructions in affected programs: 1029 -> 1028 (-0.10%) helped: 4 HURT: 3 total temps in shared programs: 12351 -> 12355 (0.03%) temps in affected programs: 10 -> 14 (40.00%) helped: 0 HURT: 4 Reviewed-by: Filip Gawin <filip.gawin@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23927>
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