From: Matt Turner <mattst88@gmail.com>
Date: Wed, 2 Dec 2015 00:13:11 +0000 (-0800)
Subject: nir: Optimize useless comparisons against true/false.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3a7f95b3aa7397aa8a118d2634fdc5cf8f84f989;p=mesa.git

nir: Optimize useless comparisons against true/false.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com> [v1]
Reviewed-by: Eric Anholt <eric@anholt.net> [v1]

v2: Move new rule to Boolean simplification section
    Add a a@bool != true simplification

Suggested-by: Neil Roberts <neil@linux.intel.com>
---

diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index 6aa8b1f6cae..cb715c0b2c1 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -184,8 +184,10 @@ optimizations = [
    (('fsqrt', a), ('frcp', ('frsq', a)), 'options->lower_fsqrt'),
    (('frcp', ('frsq', a)), ('fsqrt', a), '!options->lower_fsqrt'),
    # Boolean simplifications
-   (('ine', 'a@bool', 0), 'a'),
-   (('ieq', 'a@bool', 0), ('inot', 'a')),
+   (('ieq', 'a@bool', True), a),
+   (('ine', 'a@bool', True), ('inot', a)),
+   (('ine', 'a@bool', False), a),
+   (('ieq', 'a@bool', False), ('inot', 'a')),
    (('bcsel', a, True, False), ('ine', a, 0)),
    (('bcsel', a, False, True), ('ieq', a, 0)),
    (('bcsel', True, b, c), b),