[Mesa-dev] Status of radeonsi NIR

[Timothy Arceri]

On 05/03/18 03:43, Benedikt Schemmer wrote:
> Hi all,
> I thought I'd do some testing on my machine to see if there are any 
> problems with nir (enabled with R600_DEBUG=nir)

Hi Benedikt,

Thanks for the results. Everything looks pretty much around where I 
expected it to be performance wise and seems like regressions aren't too 
bad which is good.

Bioshock Infinite has the most noticeable perf regression in your 
results and this seems to match the shader-db results. From what I can 
tell NIR loop enrolling is a little more relaxed than GLSL IR loop 
unrolling was and we end up doing a bunch of spilling in this games 
shaders, it will be interesting to see if we can improve spilling or if 
we need to be a little more conservative with loop unrolling.

Anyway thanks again for doing some testing,
Tim

> 
> Tested on Ubuntu 17.10 with mesa git of today
> (oibaf for 32 bit, mine with LLVM5.0 on 64 bit because I cant figure out 
> how to build 32bit drivers on ubuntu :( )
> Xeon 1260l and 8GB DDR3-10600 with RX460 4GB
> 
> works means no obvious visual artifacts etc.
> I didn't have time to do detailed benchmarking.
> 
> ---
> 
> Alien Isolation - works
> 
> Bioshock Infinite - works, nonir Overall avg 45.58, min 9.81, max 
> 104.49; nir avg 31.47 min 8.35 max 94.19
> 
> CAT Interstellar (UE4) - works
> 
> Dead Island Definitive - works
> 
> Dead Island Riptide Definitive - works
> 
> Deus Ex: Mankind Divided - works, nonir low 8.3 avg 24.2 high 37.6; nir 
> low 1 avg 22.8 high 35.8
> but shader generation crashes two times: once around half the loader bar 
> with complete system freeze and then again around the end but only 
> exiting the applicationand this is reproducible by deleting the shader 
> cache
> 
> Mad Max[vulcan beta] - works
> benchmark 1
> nonir 43/45/47
> nir 10/46/50
> benchmark 2
> nonir 14/37/41
> nir 24/36/40
> benchmark 3
> nonir 8/43/61
> nir 5/41/61
> benchmark 4
> nonir 9/49/78
> nir 4/47/74
> 
> Tomb Raider - TressFX doesn't work: hair flickering and is riddled with 
> small green block artifacts, smoothing is missing; speed is the same 
> 28.6 ish
> 
> Hitman GO (Unity) - works
> 
> Unity of Command (PyGame, SDL) - works
> 
> Talos Principle Benchmark nir 64.7 nonir 67
> 
> 
> I have more games if there are any usual suspects that are likely to 
> cause problems.
> 
> Cheers,
> Benedikt