nir/algebraic: add fdot2 optimizations

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>

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index d57eff2..1ac1e6c 100644 (file)
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -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