Matt and I noticed a bunch of "val <- ior a a" operations in a shader, so we decided to add an algebraic optimization for that. While there, I decided to add a bunch more of them.
total NIR instructions in shared programs: 2023511 -> 2020814 (-0.13%) NIR instructions in affected programs: 149634 -> 146937 (-1.80%) helped: 1032 i965 already cleans these up, so the final results aren't impressive: total i965 instructions in shared programs: 6035392 -> 6035397 (0.00%) i965 instructions in affected programs: 764 -> 769 (0.65%) HURT: 3 However, improving the result of the NIR compile is worth doing. Signed-off-by: Kenneth Graunke <[email protected]> --- src/glsl/nir/nir_opt_algebraic.py | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index 169bb41..cf16b19 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -68,6 +68,22 @@ optimizations = [ (('fadd', ('fmul', a, b), c), ('ffma', a, b, c)), (('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)), (('fmin', ('fmax', a, 1.0), 0.0), ('fsat', a)), + # Logical and bit operations + (('fand', a, a), a), + (('fand', a, 0.0), 0.0), + (('iand', a, a), a), + (('iand', a, 0), 0), + (('for', a, a), a), + (('for', a, 0.0), a), + (('ior', a, a), a), + (('ior', a, 0), a), + (('fxor', a, a), 0.0), + (('ixor', a, a), 0), + (('inot', ('inot', a)), a), + # DeMorgan's Laws + (('iand', ('inot', a), ('inot', b)), ('inot', ('ior', a, b))), + (('ior', ('inot', a), ('inot', b)), ('inot', ('iand', a, b))), + # This one may not be exact (('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))), ] -- 2.2.2 _______________________________________________ mesa-dev mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-dev
