Mesa (master): nir: Add algebraic opt for no-op iand.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: a70f63ab20d8bf922a307a92020237b1dec36314
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a70f63ab20d8bf922a307a92020237b1dec36314

Author: Eric Anholt <eric at anholt.net>
Date:   Fri Jul 31 09:12:48 2015 -0700

nir: Add algebraic opt for no-op iand.

I lazily generated some of these in VC4 NIR lowering.

Reviewed-by: Iago Toral Quiroga <itoral at igalia.com>

---

 src/glsl/nir/nir_opt_algebraic.py |    1 +
 1 file changed, 1 insertion(+)

diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index 3068445..d7c1740 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -132,6 +132,7 @@ optimizations = [
    # Logical and bit operations
    (('fand', a, 0.0), 0.0),
    (('iand', a, a), a),
+   (('iand', a, ~0), a),
    (('iand', a, 0), 0),
    (('ior', a, a), a),
    (('ior', a, 0), a),