Funny thing about this... this is how i915 implements ABS. :)
Reviewed-by: Ian Romanick <ian.d.roman...@intel.com>
On 07/23/2018 12:02 AM, Jason Ekstrand wrote:
> Spotted in a shader in Batman: Arkham City.
> ---
> 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 f49b43f3213..ba277fdfd0e 100644
> --- a/src/compiler/nir/nir_opt_algebraic.py
> +++ b/src/compiler/nir/nir_opt_algebraic.py
> @@ -229,6 +229,8 @@ optimizations = [
> (('imax', a, a), a),
> (('umin', a, a), a),
> (('umax', a, a), a),
> + (('fmax', a, ('fneg', a)), ('fabs', a)),
> + (('imax', a, ('ineg', a)), ('iabs', a)),
> (('fmin', a, ('fneg', a)), ('fneg', ('fabs', a))),
> (('imin', a, ('ineg', a)), ('ineg', ('iabs', a))),
> (('fmin', a, ('fneg', ('fabs', a))), ('fneg', ('fabs', a))),
>
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