[Mesa-dev] [PATCH 1/5] nir: Add opt_algebraic rules for xor with zero.

[Matt Turner]

instructions in affected programs: 668 -> 664 (-0.60%)
helped: 4
---
 src/compiler/nir/nir_opt_algebraic.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/compiler/nir/nir_opt_algebraic.py 
b/src/compiler/nir/nir_opt_algebraic.py
index e7765fa..60df69f 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -149,6 +149,8 @@ optimizations = [
    (('ior', a, 0), a),
    (('fxor', a, a), 0.0),
    (('ixor', a, a), 0),
+   (('fxor', a, 0.0), a),
+   (('ixor', a, 0), a),
    (('inot', ('inot', a)), a),
    # DeMorgan's Laws
    (('iand', ('inot', a), ('inot', b)), ('inot', ('ior',  a, b))),
-- 
2.4.10

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