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nir/algebraic: Simplify max(abs(a), 0.0) -> abs(a)

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This pattern was noticed in glmark's jellyfish scene.

v2: Add inexact qualifier due to NaN behaviour.

Minimal shader-db changes (slightly helped).

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Elie Tournier <tournier.elie@gmail.com>
This commit is contained in:
Alyssa Rosenzweig 2019-06-04 19:54:12 +00:00
parent c9c1e26106
commit d2d3cc66cf
1 changed files with 1 additions and 0 deletions
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src/compiler/nir/nir_opt_algebraic.py
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@ -399,6 +399,7 @@ optimizations = [
(('imax', a, ('iabs', a)), ('iabs', a)),
(('fmax', a, ('fneg', a)), ('fabs', a)),
(('imax', a, ('ineg', a)), ('iabs', a)),
(('~fmax', ('fabs', a), 0.0), ('fabs', 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'),
(('~fmin', ('fmax', a, -1.0), 0.0), ('fneg', ('fsat', ('fneg', a))), '!options->lower_negate && !options->lower_fsat'),