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nir: add another comparison simplification

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On BDW:

total instructions in shared programs: 13061877 -> 13060965 (-0.01%)
instructions in affected programs: 133569 -> 132657 (-0.68%)
helped: 566
HURT: 0

total cycles in shared programs: 256611784 -> 256599536 (-0.00%)
cycles in affected programs: 861016 -> 848768 (-1.42%)
helped: 379
HURT: 73

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Timothy Arceri
2017-01-04 16:21:34 +11:00
parent 3371de38f2
commit 1130f82a88
1 changed files with 2 additions and 0 deletions
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2
src/compiler/nir/nir_opt_algebraic.py
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@@ -150,6 +150,8 @@ optimizations = [
# inot(a)
(('fge', 0.0, ('b2f', a)), ('inot', a)),
(('fge', ('fneg', ('b2f', a)), 0.0), ('inot', a)),
# 0.0 < fabs(a)
# fabs(a) > 0.0
# fabs(a) != 0.0 because fabs(a) must be >= 0