From 9f02e3ab03da91162fc0c64b91a2e5ff213dff9b Mon Sep 17 00:00:00 2001
From: Matt Turner <mattst88@gmail.com>
Date: Mon, 1 Feb 2016 16:34:46 -0800
Subject: [PATCH] nir: Add opt_algebraic rules for xor with zero.

instructions in affected programs: 668 -> 664 (-0.60%)
helped: 4

Reviewed-by: Eduardo Lima Mitev <elima@igalia.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
---
 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 e7765faa146..60df69fadbd 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))),
-- 
2.30.2