On Mar 18, 2015 8:32 PM, "Matt Turner" <matts...@gmail.com> wrote:
>
> On Wed, Mar 18, 2015 at 7:39 PM, Jason Ekstrand <ja...@jlekstrand.net>
wrote:
> > On Wed, Mar 18, 2015 at 11:37 AM, Matt Turner <matts...@gmail.com>
wrote:
> >> Transform this into b2f(and(a, b)).
> >>
> >> total instructions in shared programs: 6205448 -> 6204391 (-0.02%)
> >> instructions in affected programs: 284030 -> 282973 (-0.37%)
> >> helped: 903
> >> HURT: 6
> >> ---
> >> src/glsl/nir/nir_opt_algebraic.py | 2 ++
> >> 1 file changed, 2 insertions(+)
> >>
> >> diff --git a/src/glsl/nir/nir_opt_algebraic.py
b/src/glsl/nir/nir_opt_algebraic.py
> >> index ef855aa..f956edf 100644
> >> --- a/src/glsl/nir/nir_opt_algebraic.py
> >> +++ b/src/glsl/nir/nir_opt_algebraic.py
> >> @@ -95,6 +95,8 @@ optimizations = [
> >> (('fsat', a), ('fmin', ('fmax', a, 0.0), 1.0),
'options->lower_fsat'),
> >> (('fsat', ('fsat', a)), ('fsat', a)),
> >> (('fmin', ('fmax', ('fmin', ('fmax', a, 0.0), 1.0), 0.0), 1.0),
('fmin', ('fmax', a, 0.0), 1.0)),
> >> + # Emulating booleans
> >> + (('fmul', ('b2f', a), ('b2f', b)), ('b2f', ('iand', a, b))),
> >
> > Those are only equivalent if the sources are known booleans.
> > Otherwise, no dice.
>
> Well... they're the source of a b2f. Are you saying that's not sufficient?
No, that's not. Fortunately, @bool should solve it for you in all of the
cases you care about.
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