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nir/algebraic: add fdot2 optimizations

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Add simple fdot2 optimizations that are missing.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Thomas Helland <thomashelland90@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Jonathan Marek 2019-06-20 21:56:29 -04:00
parent 1e089d0575
commit 397375d3f3
1 changed files with 3 additions and 0 deletions
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3
src/compiler/nir/nir_opt_algebraic.py
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@ -191,6 +191,9 @@ optimizations = [
(('fdot3', ('vec3', a, 0.0, 0.0), b), ('fmul', a, b)),
(('fdot3', ('vec3', a, b, 0.0), c), ('fdot2', ('vec2', a, b), c)),
(('fdot2', ('vec2', a, 0.0), b), ('fmul', a, b)),
(('fdot2', a, 1.0), ('fadd', 'a.x', 'a.y')),
# If x >= 0 and x <= 1: fsat(1 - x) == 1 - fsat(x) trivially
# If x < 0: 1 - fsat(x) => 1 - 0 => 1 and fsat(1 - x) => fsat(> 1) => 1
# If x > 1: 1 - fsat(x) => 1 - 1 => 0 and fsat(1 - x) => fsat(< 0) => 0