Mesa (master): nir: Recognize max(min(a, 1.0), 0.0) as fsat(a).

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: 6026f7e8fb993a34f3e2ad1638d7a842a5cefd80
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=6026f7e8fb993a34f3e2ad1638d7a842a5cefd80

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Thu Jun 11 01:59:44 2015 -0700

nir: Recognize max(min(a, 1.0), 0.0) as fsat(a).

We already recognize min(max(a, 0.0), 1.0) as a saturate, but neglected
this variant (which is also handled by the GLSL IR pass).

shader-db results on Broadwell:
total instructions in shared programs: 7363046 -> 7362788 (-0.00%)
instructions in affected programs:     11928 -> 11670 (-2.16%)
helped:                                64
HURT:                                  0

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Iago Toral Quiroga <itoral at igalia.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 eace791..3068445 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -101,6 +101,7 @@ optimizations = [
    (('umin', a, a), a),
    (('umax', a, a), a),
    (('fmin', ('fmax', a, 0.0), 1.0), ('fsat', a), '!options->lower_fsat'),
+   (('fmax', ('fmin', a, 1.0), 0.0), ('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)),