From: Jason Ekstrand <jason.ekstrand@intel.com>
Date: Mon, 23 Jul 2018 06:57:07 +0000 (-0700)
Subject: nir: Add a couple trivial abs optimizations
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e4d346c86db0ae332fcdf55eac0e075cfb99a7eb;p=mesa.git

nir: Add a couple trivial abs optimizations

Spotted in a shader in Batman: Arkham City.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
---

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index f49b43f3213..ba277fdfd0e 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -229,6 +229,8 @@ optimizations = [
    (('imax', a, a), a),
    (('umin', a, a), a),
    (('umax', a, a), a),
+   (('fmax', a, ('fneg', a)), ('fabs', a)),
+   (('imax', a, ('ineg', a)), ('iabs', a)),
    (('fmin', a, ('fneg', a)), ('fneg', ('fabs', a))),
    (('imin', a, ('ineg', a)), ('ineg', ('iabs', a))),
    (('fmin', a, ('fneg', ('fabs', a))), ('fneg', ('fabs', a))),