[Mesa-dev] [PATCH] nir: optimize iand(ieq(a, 0), ieq(b, 0)) to ieq(ior(a, b), 0)

[Bas Nieuwenhuizen]

Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>

On Wed, May 30, 2018 at 10:48 AM, Samuel Pitoiset
<samuel.pitoiset at gmail.com> wrote:
> Totals from affected shaders:
> SGPRS: 80 -> 80 (0.00 %)
> VGPRS: 48 -> 48 (0.00 %)
> Code Size: 2120 -> 2096 (-1.13 %) bytes
> Max Waves: 16 -> 16 (0.00 %)
>
> Only two Rise of Tomb Raider shaders are affected on my side.
>
> Cc: Ian Romanick <ian.d.romanick at intel.com>
> Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
> ---
>  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 909ea3daf4..95b5813bd7 100644
> --- a/src/compiler/nir/nir_opt_algebraic.py
> +++ b/src/compiler/nir/nir_opt_algebraic.py
> @@ -280,6 +280,8 @@ optimizations = [
>     (('iand', ('uge(is_used_once)', a, b), ('uge', a, c)), ('uge', a, ('umax', b, c))),
>     (('iand', ('uge(is_used_once)', a, c), ('uge', b, c)), ('uge', ('umin', a, b), c)),
>
> +   (('iand', ('ieq', 'a at 32', 0), ('ieq', 'b at 32', 0)), ('ieq', ('ior', 'a at 32', 'b at 32'), 0)),
> +
>     # These patterns can result when (a < b || a < c) => (a < min(b, c))
>     # transformations occur before constant propagation and loop-unrolling.
>     (('~flt', a, ('fmax', b, a)), ('flt', a, b)),
> --
> 2.17.0
>
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