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authorKenneth Graunke <[email protected]>2015-06-11 01:59:44 -0700
committerKenneth Graunke <[email protected]>2015-06-25 02:12:32 -0700
commit6026f7e8fb993a34f3e2ad1638d7a842a5cefd80 (patch)
treed16f068272cfd7741776714f2d133d6b0bfe767e /src/glsl/nir
parent77a78c65f80323059d892c501ca551ccf324b17d (diff)
nir: Recognize max(min(a, 1.0), 0.0) as fsat(a).
We already recognize min(max(a, 0.0), 1.0) as a saturate, but neglected this variant (which is also handled by the GLSL IR pass). shader-db results on Broadwell: total instructions in shared programs: 7363046 -> 7362788 (-0.00%) instructions in affected programs: 11928 -> 11670 (-2.16%) helped: 64 HURT: 0 Signed-off-by: Kenneth Graunke <[email protected]> Reviewed-by: Iago Toral Quiroga <[email protected]>
Diffstat (limited to 'src/glsl/nir')
-rw-r--r--src/glsl/nir/nir_opt_algebraic.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index eace791f5b0..3068445cbfe 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -101,6 +101,7 @@ optimizations = [
(('umin', a, a), a),
(('umax', a, a), a),
(('fmin', ('fmax', a, 0.0), 1.0), ('fsat', a), '!options->lower_fsat'),
+ (('fmax', ('fmin', a, 1.0), 0.0), ('fsat', a), '!options->lower_fsat'),
(('fsat', a), ('fmin', ('fmax', a, 0.0), 1.0), 'options->lower_fsat'),
(('fsat', ('fsat', a)), ('fsat', a)),
(('fmin', ('fmax', ('fmin', ('fmax', a, 0.0), 1.0), 0.0), 1.0), ('fmin', ('fmax', a, 0.0), 1.0)),