[Mesa-dev] [RFC 31/31] nir: Add a bool to float32 lowering pass

[Jason Ekstrand]

On Mon, Oct 22, 2018 at 6:20 PM Alyssa Rosenzweig <alyssa at rosenzweig.io>
wrote:

> For what it's worth, Midgard has real integers (including int32
> support), using hardware-level D3D10 boolean conventions. I'm trying to
> wrap my head around how this interacts with 5d85a0a.
>

Right.  Sorry.  I forgot who's working on what chip these days.  Maybe Ilia
can CC the right person.

--Jason


> I'm tempted to think the standard lower_bool_to_int32 pass would work,
> with an emulated b2f instruction in the backend IR level, rather than
> burdening NIR with those details.
>
> I'll have to look at the patch set closer to understand the impact.
>
> ---
>
> > +nir_lower_bool_to_int32_impl(nir_function_impl *impl)
> > +nir_lower_bool_to_int32(nir_shader *shader)
> > +      if (function->impl &&
> nir_lower_bool_to_int32_impl(function->impl))
>
> I'm guessing these were intended to read float32?
>
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