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st_glsl_to_tgsi and ir_to_mesa have handled conditional discards for a
long time; the previous patch added that capability to i965.
i965 (Haswell) shader-db stats:
Without NIR:
total instructions in shared programs: 5792133 -> 5776360 (-0.27%)
instructions in affected programs: 737585 -> 721812 (-2.14%)
helped: 6300
HURT: 68
GAINED: 2
With NIR:
total instructions in shared programs: 5787538 -> 5769569 (-0.31%)
instructions in affected programs: 767843 -> 749874 (-2.34%)
helped: 6522
HURT: 35
GAINED: 6
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Connor Abbott <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
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