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a4079f1cb2
On Intel platforms that don't set lower_flrp, using bcsel instead of flrp seems to be a small amount worse. On those platforms, the use of flrp, bcsel, and multiply of b2f is still an active area of research. In review, Matt suggested this is because bcsel turns into CMP+SEL, and because of the flag register we can't schedule instructions well. shader-db results: G4X / Ironlake total instructions in shared programs: 4016538 -> 4012279 (-0.11%) instructions in affected programs: 161556 -> 157297 (-2.64%) helped: 1077 HURT: 1 total cycles in shared programs: 84328296 -> 84315862 (-0.01%) cycles in affected programs: 4174570 -> 4162136 (-0.30%) helped: 926 HURT: 53 Unsurprisingly, no changes on later platforms. Signed-off-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Matt Turner <mattst88@gmail.com> |
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