[Mesa-dev] [Bug 106246] radv: VK_PIPELINE_CREATE_DISABLE_OPTIMIZATION_BIT and bringing down initial pipeline compile times

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106246

--- Comment #6 from Timothy Arceri <t_arceri at yahoo.com.au> ---
(In reply to Timothy Arceri from comment #4)
> (In reply to Nicolai Hähnle from comment #3)
> > As long as scratch buffer support is robust, removing LLVM IR optimization
> > passes is probably not a problem, though you really do want mem2reg and I
> > don't think we spend much time in the others (at least radeonsi didn't, last
> > time I checked).
> > 
> > Using the -O0 settings for the codegen backend is a lot riskier. Our compute
> > folks have done some work fixing bugs there, but I really wouldn't recommend
> > it.
> 
> Yeah I've done some experimenting with the Blacksmith demo. I'm not sure we
> can get much benefit implementing
> VK_PIPELINE_CREATE_DISABLE_OPTIMIZATION_BIT with the current state of
> things. 
> 
> Default:
> Sum of shader compile times: 325933 ms
> 
> With only LLVM DCE opt (compilation fails without this):
> Sum of shader compile times: 326451 ms
> 
> No NIR linking plus single pass over NIR opts (compilation fails without
> this):
> Sum of shader compile times: 294788 ms

I've done some playing around with the LLVM cogegen opt levels:

LLVMCodeGenLevelNone + LLVMAddEarlyCSEMemSSAPass (compilation fails without
this):
Sum of shader compile times: 211403 ms
However there are all sorts of rendering issues when running the demo.

No NIR linking plus single pass over NIR opts (compilation fails without this),
LLVMCodeGenLevelNone + LLVMAddEarlyCSEMemSSAPass(compilation fails without
this):
Sum of shader compile times: 179775 ms
With this the demo doesn't actually display the graphics it just shows a
flickering Unity logo throughout the run.

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