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nir/algebraic: Optimize away an fsat of a b2f

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The b2f can only produce 0.0 or 1.0, so the fsat does nothing.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Ian Romanick
2019-03-01 14:41:59 -08:00
parent d1d56f5f9a
commit bae0c36751
1 changed files with 1 additions and 0 deletions
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src/compiler/nir/nir_opt_algebraic.py
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@@ -337,6 +337,7 @@ optimizations = [
(('~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', ('fsign', a)), ('b2f', ('flt', 0.0, a))),
(('fsat', ('b2f', a)), ('b2f', a)),
(('fsat', a), ('fmin', ('fmax', a, 0.0), 1.0), 'options->lower_fsat'),
(('fsat', ('fsat', a)), ('fsat', a)),
(('fmin', ('fmax', ('fmin', ('fmax', a, b), c), b), c), ('fmin', ('fmax', a, b), c)),