Mesa (master): nir: Add variants of some of the comparison simplifications.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: fc884eadf1fb188b7dea1a5c2f8ce37c6258e324
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=fc884eadf1fb188b7dea1a5c2f8ce37c6258e324

Author: Eric Anholt <eric at anholt.net>
Date:   Mon Jan 26 16:48:48 2015 -0800

nir: Add variants of some of the comparison simplifications.

We end up with these from TGSI-to-NIR because the pass generating the
comparisons doesn't know if the arg is actually a bool input or not.  vc4
results:

total instructions in shared programs: 41801 -> 41508 (-0.70%)
instructions in affected programs:     4253 -> 3960 (-6.89%)

Reviewed-by: Matt Turner <mattst88 at gmail.com>

---

 src/glsl/nir/nir_opt_algebraic.py |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py
index 9c62b28..122555b 100644
--- a/src/glsl/nir/nir_opt_algebraic.py
+++ b/src/glsl/nir/nir_opt_algebraic.py
@@ -71,6 +71,10 @@ optimizations = [
    (('inot', ('fge', a, b)), ('flt', a, b)),
    (('inot', ('ilt', a, b)), ('ige', a, b)),
    (('inot', ('ige', a, b)), ('ilt', a, b)),
+   (('ine', ('flt', a, b), 0), ('flt', a, b)),
+   (('ine', ('fge', a, b), 0), ('fge', a, b)),
+   (('ine', ('ilt', a, b), 0), ('ilt', a, b)),
+   (('ine', ('ige', a, b), 0), ('ige', a, b)),
    (('flt', ('fadd', a, b), 0.0), ('flt', a, ('fneg', b))),
    (('fge', ('fadd', a, b), 0.0), ('fge', a, ('fneg', b))),
    (('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))),