Comment # 5
on bug 89944
from Tom Stellard
(In reply to Sami Liedes from comment #3) > I bisected this down to this commit: > > ------------------------------------------------------------ > commit 30f51f1a1a70bc838d5bed449daff0dd9f2e8ef2 > Author: Kenneth Graunke <kenneth@whitecape.org> > Date: Wed Oct 22 20:48:21 2014 -0700 > > glsl: Optimize "if (cond) discard;" to a conditional discard. > > > > 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 <kenneth@whitecape.org> > Reviewed-by: Connor Abbott <cwabbott0@gmail.com> > Reviewed-by: Matt Turner <mattst88@gmail.com> > Reviewed-by: Eric Anholt <eric@anholt.net> > ------------------------------------------------------------ > > I can also confirm that reverting that commit on top of recent HEAD > (4deca127) fixes the issue. > > I can attach R600_DEBUG=ps,gs,vs output from the offending commit and its > parent if you think comparing them is of any use That would be useful.
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