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nir: Recognize (a < b || a < c) as a < max(b, c). 

Doesn't work for analogous && cases, because of NaNs.

total instructions in shared programs: 6195712 -> 6194829 (-0.01%)
instructions in affected programs:     42000 -> 41117 (-2.10%)
helped:                                403

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Matt Turner 2015-03-26 10:09:21 -07:00
parent a2b6e908cf
commit 97e6c1b957
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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@ -94,6 +94,8 @@ optimizations = [
(('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)),
(('ior', ('flt', a, b), ('flt', a, c)), ('flt', a, ('fmax', b, c))),
(('ior', ('fge', a, b), ('fge', a, c)), ('fge', a, ('fmin', b, c))),
# Emulating booleans
(('fmul', ('b2f', a), ('b2f', b)), ('b2f', ('iand', a, b))),
(('fsat', ('fadd', ('b2f', a), ('b2f', b))), ('b2f', ('ior', a, b))),