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nir: Recognize and reduce duplicated fsats. 

No effect on vc4 shader-db.

v2: Rebase to master (no TGSI->NIR present)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> (v1)
This commit is contained in:
Eric Anholt 2015-01-30 14:10:58 -08:00
parent 1907a3a7ee
commit 6eadde51bb
1 changed files with 2 additions and 0 deletions
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2
src/glsl/nir/nir_opt_algebraic.py
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@ -87,6 +87,8 @@ optimizations = [
(('bcsel', ('flt', a, b), b, a), ('fmax', a, b)),
(('fmin', ('fmax', a, 0.0), 1.0), ('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)),
# Comparison with the same args. Note that these are not done for
# the float versions because NaN always returns false on float
# inequalities.