From: Matt Turner <mattst88@gmail.com>
Date: Wed, 6 May 2015 02:56:27 +0000 (-0700)
Subject: nir: Recognize i2b(b2i(x)) as x.
X-Git-Tag: upstream/17.1.0~18967
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8ae559971a692b417acb9fec04386e1e95c619ec;p=platform%2Fupstream%2Fmesa.git

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@intel.com>
Reviewed-by: Glenn Kennard <glenn.kennard@gmail.com>
---

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)),