From: Eric Anholt <eric@anholt.net>
Date: Fri, 30 Jan 2015 22:10:58 +0000 (-0800)
Subject: nir: Recognize and reduce duplicated fsats.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6eadde51bba26bc57da7b26cbb40d783259d4a5f;p=mesa.git

nir: Recognize and reduce duplicated fsats.

No effect on vc4 shader-db.

v2: Rebase to master (no TGSI->NIR present)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> (v1)
---

diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index c7cb651fbb4..504c9f69054 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -87,6 +87,8 @@ optimizations = [
    (('bcsel', ('flt', a, b), b, a), ('fmax', a, b)),
    (('fmin', ('fmax', a, 0.0), 1.0), ('fsat', a), '!options->lower_fsat'),
    (('fsat', a), ('fmin', ('fmax', a, 0.0), 1.0), 'options->lower_fsat'),
+   (('fsat', ('fsat', a)), ('fsat', a)),
+   (('fmin', ('fmax', ('fmin', ('fmax', a, 0.0), 1.0), 0.0), 1.0), ('fmin', ('fmax', a, 0.0), 1.0)),
    # Comparison with the same args.  Note that these are not done for
    # the float versions because NaN always returns false on float
    # inequalities.