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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - radv: VK_PIPELINE_CREATE_DISABLE_OPTIMIZATION_BIT and bringing down initial pipeline compile times"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106246#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - radv: VK_PIPELINE_CREATE_DISABLE_OPTIMIZATION_BIT and bringing down initial pipeline compile times"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106246">bug 106246</a>
from <span class="vcard"><a class="email" href="mailto:t_arceri@yahoo.com.au" title="Timothy Arceri <t_arceri@yahoo.com.au>"> <span class="fn">Timothy Arceri</span></a>
</span></b>
<pre>(In reply to Timothy Arceri from <a href="show_bug.cgi?id=106246#c6">comment #6</a>)
<span class="quote">> (In reply to Timothy Arceri from <a href="show_bug.cgi?id=106246#c4">comment #4</a>)
> > (In reply to Nicolai Hähnle from <a href="show_bug.cgi?id=106246#c3">comment #3</a>)
> > > 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.</span >
Ok so it seems this speed up (and the display issues that go with it) and due
to switching from the GreedyRegisterAllocator to the FastRegisterAllocator.</pre>
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