Mesa (master): nir: add unsigned comparison simplifications

[Timothy Arceri]

Module: Mesa
Branch: master
Commit: e8b368ad1c4bdafc32505b722617b8ab19296fbe
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e8b368ad1c4bdafc32505b722617b8ab19296fbe

Author: Timothy Arceri <tarceri at itsqueeze.com>
Date:   Wed May 30 20:32:24 2018 +1000

nir: add unsigned comparison simplifications

This avoids loop unrolling regressions in Wolfenstein II on DXVK
with an upcoming optimisation series from Samuel.

Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>

---

 src/compiler/nir/nir_opt_algebraic.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 909ea3daf4..21b9acecbe 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -149,7 +149,9 @@ optimizations = [
    (('~inot', ('feq', a, b)), ('fne', a, b)),
    (('~inot', ('fne', a, b)), ('feq', a, b)),
    (('inot', ('ilt', a, b)), ('ige', a, b)),
+   (('inot', ('ult', a, b)), ('uge', a, b)),
    (('inot', ('ige', a, b)), ('ilt', a, b)),
+   (('inot', ('uge', a, b)), ('ult', a, b)),
    (('inot', ('ieq', a, b)), ('ine', a, b)),
    (('inot', ('ine', a, b)), ('ieq', a, b)),