[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)),
>>
>