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nir: Propagate negates up multiplication chains. 

total instructions in shared programs: 7112159 -> 7088092 (-0.34%)
instructions in affected programs: 1374915 -> 1350848 (-1.75%)
helped: 7392
HURT: 621

GAINED: 2
LOST:   2
This commit is contained in:
Matt Turner 2016-02-22 15:16:49 -08:00
parent a74fc3fe8a
commit 6702f1acde
1 changed files with 4 additions and 0 deletions
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4
src/compiler/nir/nir_opt_algebraic.py
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@ -269,6 +269,10 @@ optimizations = [
(('fabs', ('fsub', 0.0, a)), ('fabs', a)),
(('iabs', ('isub', 0, a)), ('iabs', a)),
# Propagate negation up multiplication chains
(('fmul', ('fneg', a), b), ('fneg', ('fmul', a, b))),
(('imul', ('ineg', a), b), ('ineg', ('fmul', a, b))),
# Misc. lowering
(('fmod', a, b), ('fsub', a, ('fmul', b, ('ffloor', ('fdiv', a, b)))), 'options->lower_fmod'),
(('uadd_carry', a, b), ('b2i', ('ult', ('iadd', a, b), a)), 'options->lower_uadd_carry'),