nir/algebraic: Simplify min and max of b2i

This prevents ~400 shader-db regresssions and a handful of fossil-db
regressions after i2b is always lowered.

All Ivy Bridge and newer Intel platforms had similar results. (Ice Lake shown)
total cycles in shared programs: 855301494 -> 855302118 (<.01%)
cycles in affected programs: 52787 -> 53411 (1.18%)
helped: 4 / HURT: 5

All Intel platforms had similar results. (Ice Lake shown)
Instructions in all programs: 141206055 -> 141205979 (-0.0%)
Instructions helped: 14

Cycles in all programs: 9133376616 -> 9133387327 (+0.0%)
Cycles helped: 13
Cycles hurt: 3

Acked-by: Jesse Natalie <jenatali@microsoft.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Tested-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15121>

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 77fa16b..f3612a2 100644 (file)
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -1429,6 +1429,11 @@ optimizations.extend([
     ('ineg', ('b2i', ('ior', a, b)))),
    (('umin', ('ineg', ('b2i', 'a@1')), ('ineg', ('b2i', 'b@1'))),
     ('ineg', ('b2i', ('iand', a, b)))),
+   (('umax', ('b2i', 'a@1'), ('b2i', 'b@1')), ('b2i', ('ior',  a, b))),
+   (('umin', ('b2i', 'a@1'), ('b2i', 'b@1')), ('b2i', ('iand', a, b))),
+
+   (('ine', ('umin', ('ineg', ('b2i', 'a@1')), b), 0), ('iand', a, ('ine', b, 0))),
+   (('ine', ('umax', ('ineg', ('b2i', 'a@1')), b), 0), ('ior' , a, ('ine', b, 0))),
 
    # Conversions
    (('f2i', ('ftrunc', a)), ('f2i', a)),