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nir: Simplify feq(fneg(a), a)) -> feq(a, 0.0) 

The positive and negative value of a float can only
be equal to each other if it is -0.0f and 0.0f.
This is safe for Nan and Inf, as -Nan != Nan, and -Inf != Inf
This gives no changes in my shader-db

Signed-off-by: Thomas Helland <thomashelland90@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Thomas Helland 2015-08-06 13:36:05 +02:00 committed by Matt Turner
parent a39167d594
commit 49d0a36bd6
1 changed files with 1 additions and 0 deletions
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src/glsl/nir/nir_opt_algebraic.py
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@ -114,6 +114,7 @@ optimizations = [
(('seq', a, b), ('b2f', ('feq', a, b)), 'options->lower_scmp'), (('seq', a, b), ('b2f', ('feq', a, b)), 'options->lower_scmp'),
(('sne', a, b), ('b2f', ('fne', a, b)), 'options->lower_scmp'), (('sne', a, b), ('b2f', ('fne', a, b)), 'options->lower_scmp'),
(('fne', ('fneg', a), a), ('fne', a, 0.0)), (('fne', ('fneg', a), a), ('fne', a, 0.0)),
(('feq', ('fneg', a), a), ('feq', a, 0.0)),
# Emulating booleans # Emulating booleans
(('imul', ('b2i', a), ('b2i', b)), ('b2i', ('iand', a, b))), (('imul', ('b2i', a), ('b2i', b)), ('b2i', ('iand', a, b))),
(('fmul', ('b2f', a), ('b2f', b)), ('b2f', ('iand', a, b))), (('fmul', ('b2f', a), ('b2f', b)), ('b2f', ('iand', a, b))),