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[AMD Official Use Only]<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:ZH-CN">+1
<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Taher <work@taherx.dev>
<br>
<b>Sent:</b> Thursday, November 11, 2021 1:53 PM<br>
<b>To:</b> Artem Belevich <tra@google.com><br>
<b>Cc:</b> Quentin Colombet <qcolombet@apple.com>; Liu, Yaxun (Sam) <Yaxun.Liu@amd.com>; Lieberman, Ron <Ron.Lieberman@amd.com>; justin.lebar@gmail.com; Chesterfield, Jonathan <Jonathan.Chesterfield@amd.com>; llvm-dev@lists.llvm.org; tianshilei1992@gmail.com;
Rodgers, Gregory <Gregory.Rodgers@amd.com>; Valentin Churavy <v.churavy@gmail.com>; Huber, Joseph <huberjn@ornl.gov>; Narayanaswamy, Ravi <ravi.narayanaswamy@intel.com><br>
<b>Subject:</b> Re: [llvm-dev] Should we have a "GPU working group"?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">[CAUTION: External Email] <o:p></o:p></p>
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<p class="MsoNormal">+1<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Nov 11, 2021 at 10:51 AM Artem Belevich via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">+cc: <a href="mailto:yaxun.liu@amd.com" target="_blank">yaxun.liu@amd.com</a> for HIP.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Also, count me in.<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Nov 11, 2021 at 10:32 AM Quentin Colombet via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">+1, count me in. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal">-Quentin<o:p></o:p></p>
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<br>
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<p class="MsoNormal">On Nov 11, 2021, at 10:22 AM, Jason Eckhardt via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">+1 here as well, even if in lurk mode initially.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">Some additional topics of interest:<o:p></o:p></span></p>
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<i><span style="font-family:"Calibri",sans-serif">Occupancy vs resource trade-offs (especially registers)</span></i><span style="font-family:"Calibri",sans-serif">. Requires closer coordination of scheduling + register allocation, in addition to extensions
in each. <o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<i><span style="font-family:"Calibri",sans-serif">Divergence analysis/uniformity analysis</span></i><span style="font-family:"Calibri",sans-serif">. Applications to sync insertion, scalar vs vector register allocation, instruction selection, etc.<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<i><span style="font-family:"Calibri",sans-serif">Synchronization insertion</span></i><span style="font-family:"Calibri",sans-serif">. Some GPUs have instructions to hint where a good re-convergence point is.<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<i><span style="font-family:"Calibri",sans-serif">Global instruction scheduling</span></i><span style="font-family:"Calibri",sans-serif">. Some GPU code is surprisingly branchy. Numerous out-of-tree/proprietary global schedulers have been written, we <i>still</i> don't
have one upstream.<o:p></o:p></span></li><li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style="font-family:"Calibri",sans-serif">I<i>ncreasing overall back-end speed for JIT compilation</i>. GPU back-ends are often situated within graphics drivers where they dynamically compile shaders with absurdly stringent timing constraints. GlobalISel
is a step in the right direction, but more needs doing (particularly for small shaders). <o:p></o:p></span></li></ol>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">As an example, #1 is handled (if at all) specially by each target. With the proliferation of GPUs (Teams Red, Green, Blue, and others), it would be useful for "all boats to float higher" with
generic code (with target-specific hooks/overrides) supported by the wider community as opposed to redundant re-invention of the wheel (or no wheel at all, as in #4). Then specific targets can expend effort adding value for their particular needs. <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> llvm-dev <<a href="mailto:llvm-dev-bounces@lists.llvm.org" target="_blank">llvm-dev-bounces@lists.llvm.org</a>>
on behalf of Lei Zhang via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>><br>
<b>Sent:</b> Thursday, November 11, 2021 9:44 AM<br>
<b>To:</b> Valentin Churavy <<a href="mailto:v.churavy@gmail.com" target="_blank">v.churavy@gmail.com</a>><br>
<b>Cc:</b> Lieberman, Ron <<a href="mailto:Ron.Lieberman@amd.com" target="_blank">Ron.Lieberman@amd.com</a>>; <a href="mailto:justin.lebar@gmail.com" target="_blank">justin.lebar@gmail.com</a> <<a href="mailto:justin.lebar@gmail.com" target="_blank">justin.lebar@gmail.com</a>>;
Chesterfield, Jonathan <<a href="mailto:Jonathan.Chesterfield@amd.com" target="_blank">Jonathan.Chesterfield@amd.com</a>>; <a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a> <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>>; <a href="mailto:tianshilei1992@gmail.com" target="_blank">tianshilei1992@gmail.com</a> <<a href="mailto:tianshilei1992@gmail.com" target="_blank">tianshilei1992@gmail.com</a>>;
Rodgers, Gregory <<a href="mailto:Gregory.Rodgers@amd.com" target="_blank">Gregory.Rodgers@amd.com</a>>; Huber, Joseph <<a href="mailto:huberjn@ornl.gov" target="_blank">huberjn@ornl.gov</a>>; Narayanaswamy, Ravi <<a href="mailto:ravi.narayanaswamy@intel.com" target="_blank">ravi.narayanaswamy@intel.com</a>><br>
<b>Subject:</b> Re: [llvm-dev] Should we have a "GPU working group"?</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">
<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif">External email: Use caution opening links or attachments</span></b><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">+1. There are certainly efforts that need broad collaboration among various interest parties; they would benefit from more interactive discussions to have everybody on the
same page. What immediately jumps into my mind include how we can push to have unified/better SPIR-V support in LLVM proper / cross LLVM/MLIR, etc. It's a big one that I'd assume will take a long time to unfold and will have back and forth. Having a place
to discuss will actually make sure we put efforts towards it (or at least have plans and revisit periodically). There are certainly many other topics to discuss too, as said by Johannes. I think this is a great idea.
<o:p></o:p></span></p>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">Thanks,
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">Lei<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">On Wed, Nov 10, 2021 at 4:03 PM Valentin Churavy via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">I would certainly be interested in joining such an effort.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">-V<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">On Wed, Nov 10, 2021 at 3:56 PM Johannes Doerfert via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif">Hey,<br>
<br>
We nowadays have various "working groups" that meet regularly to discuss <br>
technical topics (incl. RISC-V, MLIR, OpenMP, Alias Analysis, ML, Flang, <br>
...).<br>
It's a reasonably nice way for people to connect and present ideas, get <br>
feedback, etc. in an interactive environment.<br>
While the OpenMP meeting has a strong emphasis on offloading, we do not <br>
meet to discuss "generic GPU" topics as a community.<br>
<br>
This email is to determine if people would be interested in meeting once <br>
every N weeks (initially we could say 2) to coordinate efforts in this <br>
space, e.g., development of GPU-specific optimizations, organization of <br>
driver and backend code, dealing with issues like convergent functions, ...<br>
<br>
I CC'ed a bunch of people that might want to join such a meeting but <br>
certainly this is something everyone would be invited to and I hope <br>
people forward this to parties that might not read llvm-dev.<br>
<br>
Looking forward to hear what people think :)<br>
<br>
~ Johannes<br>
<br>
<br>
<br>
<br>
-- <br>
$B(!(!(!(!(!(!(!(!(!(!(!(!(!(!(!(!(!(!(!(B<br>
</span><span style="font-size:9.0pt;font-family:"Cambria Math",serif">$B"f(B</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"> Johannes (he/his)<br>
<br>
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<p class="MsoNormal"><o:p> </o:p></p>
</div>
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<p class="MsoNormal">_______________________________________________<br>
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<p class="MsoNormal"><br clear="all">
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal">--Artem Belevich<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal">_______________________________________________<br>
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