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9355116bda
This makes the dataflow propagation logic of the copy propagation pass more intelligent in cases where the destination of a copy is known to be undefined for some incoming CFG edges, building upon the definedness information provided by the last patch. Helps a few programs, and avoids a handful shader-db regressions from the next patch. shader-db results on ILK: total instructions in shared programs: 6541547 -> 6541523 (-0.00%) instructions in affected programs: 360 -> 336 (-6.67%) helped: 8 HURT: 0 LOST: 0 GAINED: 10 shader-db results on BDW: total instructions in shared programs: 8174323 -> 8173882 (-0.01%) instructions in affected programs: 7730 -> 7289 (-5.71%) helped: 5 HURT: 2 LOST: 0 GAINED: 4 shader-db results on SKL: total instructions in shared programs: 8185669 -> 8184598 (-0.01%) instructions in affected programs: 10364 -> 9293 (-10.33%) helped: 5 HURT: 2 LOST: 0 GAINED: 2 Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> |
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