[Mesa-dev] [PATCH v3 06/29] glsl: add ARB_gpu_shader_fp64 to the glsl extensions. (v2)

Aditya Avinash adityaavinash1 at gmail.com
Sun Feb 8 15:20:46 PST 2015

If softfloat is implemented, where can be a right place to put it?

On Sun, Feb 8, 2015 at 6:17 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:

> On Sun, Feb 8, 2015 at 5:51 PM, Dave Airlie <airlied at gmail.com> wrote:
> > On 9 February 2015 at 08:44, Aditya Avinash <adityaavinash1 at gmail.com>
> wrote:
> >> Ya. I just want to know that part "only some r600".
> >> I believe some of the nv0 cards doesn't support double. You have any
> ideas
> >> or suggestions to make it possible?
> >
> > For AMD
> > http://en.wikipedia.org/wiki/List_of_AMD_graphics_processing_units
> >
> > has what cards directly support double precision for r600/700/evergreen
> >
> > The plan is to implement a soffloat library like the fglrx drivers do
> for the
> > GPUs that don't do doubles just to satisfy the GL4.0 requirement.
> >
> > Whether we implement this in GLSL, NIR or in the backends is currently
> > an open question.
> >
> > Not sure what the nvidia limitations are if any.
> All of the Fermi+ cards have pretty full hw support. The only lacking
> area is that they only compute the upper 32 bits of a RSQ and RCP
> operation, but that's solvable with a bit of Newton-Raphson magic.
> The G200 chip (NVA0) is the only Tesla-family chip which has some fp64
> support, but it's missing some useful operations, like any sort of
> sqrt or division-related functionality. But it can add/multiply. Some
> sort of partial softfloat may be useful there, but... it can be
> difficult to care about the single high-end chip of the old family.
>   -ilia


*Aditya Atluri,*

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