Mesa (master): nir: Recognize i2b(b2i(x)) as x.

[Matt Turner]

Module: Mesa
Branch: master
Commit: 8ae559971a692b417acb9fec04386e1e95c619ec
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8ae559971a692b417acb9fec04386e1e95c619ec

Author: Matt Turner <mattst88 at gmail.com>
Date:   Tue May  5 19:56:27 2015 -0700

nir: Recognize i2b(b2i(x)) as x.

Helps the same set of programs as the previous commit.

instructions in affected programs:     4490 -> 4346 (-3.21%)
helped:                                8

Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>
Reviewed-by: Glenn Kennard <glenn.kennard at gmail.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 92928cf..fda4bd5 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -188,6 +188,7 @@ optimizations = [
    (('fcsel', a, b, b), b),
 
    # Conversions
+   (('i2b', ('b2i', a)), a),
    (('f2i', ('ftrunc', a)), ('f2i', a)),
    (('f2u', ('ftrunc', a)), ('f2u', a)),