From 3371de38f282c77461bbe5007a2fec2a975776df Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Tue, 9 Aug 2016 01:44:38 -0700 Subject: nir: Turn bcsel of +/- 1.0 and 0.0 into b2f sequences. On BDW: total instructions in shared programs: 13074882 -> 13068703 (-0.05%) instructions in affected programs: 1823116 -> 1816937 (-0.34%) helped: 4187 HURT: 537 total cycles in shared programs: 256622718 -> 256425382 (-0.08%) cycles in affected programs: 123790120 -> 123592784 (-0.16%) helped: 3823 HURT: 2037 total spills in shared programs: 15276 -> 14929 (-2.27%) spills in affected programs: 9446 -> 9099 (-3.67%) helped: 352 HURT: 1 total fills in shared programs: 20496 -> 20144 (-1.72%) fills in affected programs: 13040 -> 12688 (-2.70%) helped: 352 HURT: 1 LOST: 2 GAINED: 21 v2: Rely on 'a' being a well-formed boolean (Connor, Eric). Signed-off-by: Kenneth Graunke Reviewed-by: Timothy Arceri Reviewed-by: Jason Ekstrand --- src/compiler/nir/nir_opt_algebraic.py | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'src/compiler/nir') diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py index 3b8836e6be8..434881f85bf 100644 --- a/src/compiler/nir/nir_opt_algebraic.py +++ b/src/compiler/nir/nir_opt_algebraic.py @@ -269,6 +269,10 @@ optimizations = [ (('ieq', 'a@bool', False), ('inot', 'a')), (('bcsel', a, True, False), a), (('bcsel', a, False, True), ('inot', a)), + (('bcsel@32', a, 1.0, 0.0), ('b2f', a)), + (('bcsel@32', a, 0.0, 1.0), ('b2f', ('inot', a))), + (('bcsel@32', a, -1.0, -0.0), ('fneg', ('b2f', a))), + (('bcsel@32', a, -0.0, -1.0), ('fneg', ('b2f', ('inot', a)))), (('bcsel', True, b, c), b), (('bcsel', False, b, c), c), # The result of this should be hit by constant propagation and, in the -- cgit v1.2.3