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nir: Recognize open-coded fmin/fmax. 

And unfortunately other shaders do the same thing but with >=/<= which
we can't apply this optimization to because of NaNs.

instructions in affected programs:     23309 -> 22938 (-1.59%)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2015-02-10 21:43:32 -08:00
parent 56e21647e2
commit 4c42e1116b
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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@ -82,6 +82,8 @@ optimizations = [
(('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))),
(('fne', ('fadd', a, b), 0.0), ('fne', a, ('fneg', b))),
(('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)),
(('bcsel', ('flt', a, b), a, b), ('fmin', a, b)),
(('bcsel', ('flt', a, b), b, a), ('fmax', a, b)),
(('fmin', ('fmax', a, 0.0), 1.0), ('fsat', a)),
# Comparison with the same args. Note that these are not done for
# the float versions because NaN always returns false on float