From 15063d2ad0945004ef387511d0c805bbe734bc5f Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Wed, 21 Jan 2015 23:52:17 -0800 Subject: [PATCH] nir: Add algebraic optimizations for division and reciprocal. These also exist in opt_algebraic.cpp. total NIR instructions in shared programs: 2011430 -> 2011211 (-0.01%) NIR instructions in affected programs: 42221 -> 42002 (-0.52%) helped: 198 total i965 instructions in shared programs: 6020553 -> 6020116 (-0.01%) i965 instructions in affected programs: 84322 -> 83885 (-0.52%) helped: 394 HURT: 1 (by 1 instruction) Signed-off-by: Kenneth Graunke Reviewed-by: Jason Ekstrand Reviewed-by: Matt Turner --- src/glsl/nir/nir_opt_algebraic.py | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index 42846e1202b..9c62b283634 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -106,6 +106,11 @@ optimizations = [ (('fpow', a, 1.0), a), (('fpow', a, 2.0), ('fmul', a, a)), (('fpow', 2.0, a), ('fexp2', a)), + # Division and reciprocal + (('fdiv', 1.0, a), ('frcp', a)), + (('frcp', ('frcp', a)), a), + (('frcp', ('fsqrt', a)), ('frsq', a)), + (('frcp', ('frsq', a)), ('fsqrt', a)), # This one may not be exact (('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))), -- 2.30.2