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

[Ian Romanick]

"less than"

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...

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)),
>