From 9725e45b3d06d7e226471e0c0eb8da0b0d54f448 Mon Sep 17 00:00:00 2001 From: Ian Romanick Date: Wed, 24 Oct 2018 19:48:49 -0700 Subject: [PATCH] nir/algebraic: Simplify fsqrt domain guard MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit All Gen7+ platforms had similar results. (Ice Lake shown) total instructions in shared programs: 17228376 -> 17225365 (-0.02%) instructions in affected programs: 280732 -> 277721 (-1.07%) helped: 1072 HURT: 0 helped stats (abs) min: 1 max: 12 x̄: 2.81 x̃: 2 helped stats (rel) min: 0.16% max: 5.10% x̄: 1.43% x̃: 1.07% 95% mean confidence interval for instructions value: -2.92 -2.70 95% mean confidence interval for instructions %-change: -1.48% -1.37% Instructions are helped. total cycles in shared programs: 360935690 -> 360842788 (-0.03%) cycles in affected programs: 7838017 -> 7745115 (-1.19%) helped: 1569 HURT: 69 helped stats (abs) min: 1 max: 1198 x̄: 63.53 x̃: 20 helped stats (rel) min: 0.06% max: 26.17% x̄: 3.44% x̃: 2.12% HURT stats (abs) min: 1 max: 2820 x̄: 98.22 x̃: 47 HURT stats (rel) min: 0.05% max: 16.67% x̄: 3.50% x̃: 2.31% 95% mean confidence interval for cycles value: -63.55 -49.89 95% mean confidence interval for cycles %-change: -3.33% -2.96% Cycles are helped. No changes on any other platform. Reviewed-by: Matt Turner Reviewed-by: Thomas Helland --- src/compiler/nir/nir_opt_algebraic.py | 1 + 1 file changed, 1 insertion(+) diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py index ccf57fd4b86..15ac3bd32ca 100644 --- a/src/compiler/nir/nir_opt_algebraic.py +++ b/src/compiler/nir/nir_opt_algebraic.py @@ -570,6 +570,7 @@ optimizations = [ (('~flog2', ('frsq', a)), ('fmul', -0.5, ('flog2', a))), (('~flog2', ('fpow', a, b)), ('fmul', b, ('flog2', a))), (('~fmul', ('fexp2(is_used_once)', a), ('fexp2(is_used_once)', b)), ('fexp2', ('fadd', a, b))), + (('bcsel', ('flt', a, 0.0), 0.0, ('fsqrt', a)), ('fsqrt', ('fmax', a, 0.0))), # Division and reciprocal (('~fdiv', 1.0, a), ('frcp', a)), (('fdiv', a, b), ('fmul', a, ('frcp', b)), 'options->lower_fdiv'), -- 2.30.2