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

[Jason Ekstrand]

Rb

On Jan 7, 2017 4:00 AM, "Timothy Arceri" <timothy.arceri at collabora.com>
wrote:

> 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
>
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