From cb95a228e81a963d77f50058c7406db0ad3bccac Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Wed, 28 Jan 2015 10:39:29 -0800 Subject: [PATCH] nir: Add a flag for lowering fsqrt(x) to frcp(frsqrt(x)). vc4 cse/algebraic-disabled stats: total uniforms in shared programs: 13972 -> 13966 (-0.04%) uniforms in affected programs: 408 -> 402 (-1.47%) total instructions in shared programs: 44973 -> 44911 (-0.14%) instructions in affected programs: 1551 -> 1489 (-4.00%) v2: Rebase to master (no TGSI->NIR present) Reviewed-by: Kenneth Graunke (v1) --- src/glsl/nir/nir.h | 1 + src/glsl/nir/nir_opt_algebraic.py | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h index bcc51e88ac8..37e15efa5cf 100644 --- a/src/glsl/nir/nir.h +++ b/src/glsl/nir/nir.h @@ -1328,6 +1328,7 @@ typedef struct nir_function { typedef struct nir_shader_compiler_options { bool lower_fpow; + bool lower_fsqrt; } nir_shader_compiler_options; typedef struct nir_shader { diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index b8b28f1d6d1..f93757e0325 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -128,7 +128,8 @@ optimizations = [ (('fdiv', 1.0, a), ('frcp', a)), (('frcp', ('frcp', a)), a), (('frcp', ('fsqrt', a)), ('frsq', a)), - (('frcp', ('frsq', a)), ('fsqrt', a)), + (('fsqrt', a), ('frcp', ('frsq', a)), 'options->lower_fsqrt'), + (('frcp', ('frsq', a)), ('fsqrt', a), '!options->lower_fsqrt'), # Boolean simplifications (('ine', 'a@bool', 0), 'a'), (('ieq', 'a@bool', 0), ('inot', 'a')), -- 2.30.2