[Mesa-dev] [RFC PATCH] Add GL_MESA_ieee_fp_alu_mode specification draft

[Ilia Mirkin]

On Mon, Feb 24, 2020 at 6:56 PM Ilia Mirkin <imirkin at alum.mit.edu> wrote:
>
> On Sun, Feb 23, 2020 at 8:57 PM Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> >
> > ---
> >
> > We talked about something like this a while back, but the end result
> > was inconclusive. I added a TGSI MUL_ZERO_WINS shader property for nine.
> > But it'd be nice for wine to be able to control this too.
> >
> > I couldn't actually find any evidence of the discussion from 2017 or so,
> > so ... let's have another one.
>
> Ian, Matteo, thanks for your feedback.
>
> Based on IRC discussion today, it looks like radeonsi is not
> interested in gaining such a feature, and Ian's comments all point
> away from exposing the actual hardware bits, which I think means this
> ext is DOA. I don't think support in just nouveau + r600 justifies the
> effort of getting this going -- too small of a user base between them,
> and they can use nine if they really want better perf. I guess that's
> why this ext died back in 2017 too, but at least now there will
> hopefully be an easier-to-find record of it.
>
> Cheers,
>
>   -ilia

Oh, and for posterity, strfllw in #winehackers tracked down the
original thread from 2017:

https://lists.freedesktop.org/archives/mesa-dev/2017-January/140613.html

Not sure how I missed it, I even looked in Jan 2017, but there we are.
Apparently part of the difficulty for radeonsi is LLVM, but perhaps
ACO could soften some of that blow.

  -ilia