Found by inspection. This doesn't help much now but we'll see this
pattern with images if you load UNORM and then store UNORM.
Shader-db results on Kaby Lake:
total instructions in shared programs: 15166916 -> 15166910 (<.01%)
instructions in affected programs: 761 -> 755 (-0.79%)
helped: 6
HURT: 0
---
src/compiler/nir/nir_opt_algebraic.py | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/compiler/nir/nir_opt_algebraic.py
b/src/compiler/nir/nir_opt_algebraic.py
index 07fbb161a4e..55a1feeaf47 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -302,6 +302,12 @@ optimizations = [
(('imax', a, a), a),
(('umin', a, a), a),
(('umax', a, a), a),
+ (('fmax', ('fmax', a, b), b), ('fmax', a, b)),
+ (('umax', ('umax', a, b), b), ('umax', a, b)),
+ (('imax', ('imax', a, b), b), ('imax', a, b)),
+ (('fmin', ('fmin', a, b), b), ('fmin', a, b)),
+ (('umin', ('umin', a, b), b), ('umin', a, b)),
+ (('imin', ('imin', a, b), b), ('imin', a, b)),
(('fmax', a, ('fneg', a)), ('fabs', a)),
(('imax', a, ('ineg', a)), ('iabs', a)),
(('fmin', a, ('fneg', a)), ('fneg', ('fabs', a))),
--
2.17.1
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