Re: [Mesa-dev] [PATCH] nir: add unsigned less then comparison simplification

[Timothy Arceri]

On 31/05/18 11:33, Ian Romanick wrote:

"less than"

whoops ... luckly I removed that bit from the description before pushing

This regression is with  "nir: implement the GLSL equivalent of if
simplication in nir_opt_if"?  I'll check to see if this helps the issues
that I'm seeing with that patch...

Correct.

On 05/30/2018 04:09 AM, Timothy Arceri wrote:

This avoids loop unrolling regressions in Wolfenstein II on DXVK
with an upcoming optimisation series from Samuel.
---
  src/compiler/nir/nir_opt_algebraic.py | 1 +
  1 file changed, 1 insertion(+)

diff --git a/src/compiler/nir/nir_opt_algebraic.py 
b/src/compiler/nir/nir_opt_algebraic.py
index 909ea3daf42..14ffd9e7b82 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -149,6 +149,7 @@ 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', ('ieq', a, b)), ('ine', a, b)),
     (('inot', ('ine', a, b)), ('ieq', a, b)),

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