From: Eric Anholt Date: Fri, 20 Feb 2015 08:00:27 +0000 (-0800) Subject: nir: Generalize the optimization of subs of subs from 0. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4359954d842caa2a9f8d4b50d70ecc789884b68b;p=mesa.git nir: Generalize the optimization of subs of subs from 0. I initially wrote this based on the "(('fneg', ('fneg', a)), a)" above, but we can generalize it and make it more potentially useful. In the specific original case of a 0 for our new 'a' argument, it'll get further algebraic optimization once the 0 is an argument to the new add. No shader-db effects. Reviewed-by: Matt Turner Reviewed-by: Connor Abbott --- diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index 3ea6320d36c..7bf6431345a 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -151,8 +151,8 @@ optimizations = [ (('fcsel', a, b, b), b), # Subtracts - (('fsub', 0.0, ('fsub', 0.0, a)), a), - (('isub', 0, ('isub', 0, a)), a), + (('fsub', a, ('fsub', 0.0, b)), ('fadd', a, b)), + (('isub', a, ('isub', 0, b)), ('iadd', a, b)), (('fneg', a), ('fsub', 0.0, a), 'options->lower_negate'), (('ineg', a), ('isub', 0, a), 'options->lower_negate'), (('fadd', a, ('fsub', 0.0, b)), ('fsub', a, b)),