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nir/algebraic: Add some max/min optimizations

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Found by inspection.  This doesn't help much now but we'll see this
pattern with images if you load UNORM and then store UNORM.

Shader-db results on Kaby Lake:

    total instructions in shared programs: 15166916 -> 15166910 (<.01%)
    instructions in affected programs: 761 -> 755 (-0.79%)
    helped: 6
    HURT: 0

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand 2018-08-15 04:29:42 -05:00
parent 4dd5263663
commit d448fa3ae3
1 changed files with 6 additions and 0 deletions
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6
src/compiler/nir/nir_opt_algebraic.py
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@ -302,6 +302,12 @@ optimizations = [
(('imax', a, a), a),
(('umin', a, a), a),
(('umax', a, a), a),
(('fmax', ('fmax', a, b), b), ('fmax', a, b)),
(('umax', ('umax', a, b), b), ('umax', a, b)),
(('imax', ('imax', a, b), b), ('imax', a, b)),
(('fmin', ('fmin', a, b), b), ('fmin', a, b)),
(('umin', ('umin', a, b), b), ('umin', a, b)),
(('imin', ('imin', a, b), b), ('imin', a, b)),
(('fmax', a, ('fneg', a)), ('fabs', a)),
(('imax', a, ('ineg', a)), ('iabs', a)),
(('fmin', a, ('fneg', a)), ('fneg', ('fabs', a))),