[Mesa-dev] mediump support: future work

[Samuel Pitoiset]

On RADV, we already support fp16 with the LLVM backend (not saying it's 
always optimized though) and with ACO it should be mostly working but 
not yet enabled because I think we would like fast packed math support 
first and I'm not sure if fp16 I/O are implemented.

There is also some missing fp16 optimizations in the ACO backend which 
makes some games (eg. Youngblood) a bit slower if fp16 
features/extensions are exposed but the gap should be filled soon hopefully.

I think the most important thing missing is a SLP vectorizer in NIR for us.

On 5/4/20 8:43 PM, Marek Olšák wrote:
> Hi,
>
> This is the status of mediump support in Mesa. What I listed is what 
> AMD GPUs can do. "Yes" means what Mesa supports.
>
> *Feature* 	*FP16 support* 	*Int16 support*
> ALU 	Yes 	No
> Uniforms 	No 	No
> VS in 	No 	No
> VS out / FS in 	No 	No
> FS out 	No 	No
> TCS, TES, GS out / in 	No 	No
> Sampler coordinates (only coord, derivs, lod, bias; not offset and 
> compare) 	No 	---
> Image coordinates 	--- 	No
> Return value from samplers (incl. sampler buffers) 	Yes
> 	No
> Return value from image loads (incl. image buffers) 	No 	No
> Data source for image stores (incl. image buffers) 	No 	No
> If 16-bit sampler/image instructions are surrounded by conversions, 
> promote them to 32 bits 	No 	No
>
>
> Please let me know if you don't see the table correctly.
>
> I'd like to know if I can enable some of them using the existing FP16 
> CAP. The only drivers supporting FP16 are currently Freedreno and 
> Panfrost.
>
> Thanks,
> Marek
>
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