[Mesa-dev] [PATCH 08/10] nir: add another comparison simplification

[Timothy Arceri]

On BDW:

total instructions in shared programs: 13061877 -> 13060965 (-0.01%)
instructions in affected programs: 133569 -> 132657 (-0.68%)
helped: 566
HURT: 0

total cycles in shared programs: 256611784 -> 256599536 (-0.00%)
cycles in affected programs: 861016 -> 848768 (-1.42%)
helped: 379
HURT: 73
---
 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 7cee378..eaeca5e 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -151,6 +151,8 @@ optimizations = [
    # inot(a)
    (('fge', 0.0, ('b2f', a)), ('inot', a)),
 
+   (('fge', ('fneg', ('b2f', a)), 0.0), ('inot', a)),
+
    # -(b2f(a) + b2f(b)) >= 0 becomes !(a || b)
    (('fge', ('fneg', ('fadd', ('b2f', a), ('b2f', b))), 0.0), ('inot', ('ior', a, b))),
 
-- 
2.9.3