<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Hi all,</div><div><br></div><div><div>As a reminder, the round-table will be Tuesday, Oct 22, 10:20-11:30, see here: <a href="http://llvm.org/devmtg/2019-10/#round" target="_blank">http://llvm.org/devmtg/2019-10/#round</a><br></div><div><br></div><div>Here is a potential list of all the topics I gathered from everyone, let me know if I missed anything.</div><div><br></div><div>- Intro, practical aspect of the integration (repository, etc.)</div><div>- Can we have a machine-readable definition of LLVM IR in LLVM itself: instructions, tracking changes, altering the semantics in the dialect wrt LLVM IR. We could reuse this for the MLIR LLVM Dialect.</div><div>- Clang: would the static analyzer be a good candidate for a project to be playing with a MLIR Dialect?</div><div>- Using MLIR for SCEV, VPLAN, etc. Isn’t SCEV an IR?</div><div>- MIR: could/should it be reimplemented as a MLIR dialect? </div><div>- What about Alive? (If Alive folks are around?)</div><div>- Representing parallelism in MLIR</div><div>- Heterogeneous compilation: this includes GPU of course, but also more exotic platforms / third-party accelerator: how to plug all this into a codegen story?</div><div>- Using MLIR dialects as a testbed for proposed LLVM IR changes (there were proposals of tensor types for LLVM for example). </div><div>- Using MLIR for loop optimization and other higher-level transformations, e.g. doing LLVM->Polly->MLIR Affine->LLVM.- </div><div><br></div></div><div>Note also that at shortly after the round-table, at 12:05pm the talk about <a href="https://llvm.org/devmtg/2019-10/talk-abstracts.html#tech19">An MLIR Dialect for High-Level Optimization of Fortran</a> will take place.</div><div><br></div><div>Best,</div><div><br></div><div>-- </div><div>Mehdi</div><div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Oct 18, 2019 at 7:21 AM 'James Molloy' via MLIR <<a href="mailto:mlir@tensorflow.org" target="_blank">mlir@tensorflow.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr">> Some existing bits in LLVM that could have used MLIR are ScalarEvolution expressions, VPlan, SelectionDAG. Moving these would be a lot of work obviously but what are some new things under development that could use MLIR from day one?<div><br></div><div>I'd add to this list the MIR format, which is clearly crying out for MLIR-ification.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 18 Oct 2019 at 14:00, Lei Zhang <<a href="mailto:antiagainst@google.com" target="_blank">antiagainst@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr">FYI: related to GPU compilation, there will also be a "Challenges using LLVM for GPU compilation" roundtable covering<div><br><div> - Canonicalization vs. GPUs: Type mutation;<br> - Control flow mutation (graphics shaders are more sensitive to this);<br> - Divergence/reconvergence sensitivity;<br> - Address-space awareness;<br><div><br></div><div>Time slot hasn't been finalized but <span style="color:rgb(0,0,0);white-space:pre-wrap">preliminary planned for Tue 3-4pm or Wed 2-3pm.</span></div><div><br></div><div><a href="http://lists.llvm.org/pipermail/llvm-dev/2019-October/136033.html" target="_blank">http://lists.llvm.org/pipermail/llvm-dev/2019-October/136033.html</a></div><div><br clear="all"><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr">Thanks,<div>Lei</div></div></div></div></div></div><br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 15, 2019 at 12:01 PM Sanjoy Das <<a href="mailto:sanjoy@google.com" target="_blank">sanjoy@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr">I won't be present during the round table, but it might be interesting to discuss if there are ways to use MLIR within LLVM.<div><br></div><div>Some existing bits in LLVM that could have used MLIR are ScalarEvolution expressions, VPlan, SelectionDAG. Moving these would be a lot of work obviously but what are some new things under development that could use MLIR from day one?</div><div><br></div><div>-- Sanjoy</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 15, 2019 at 3:59 AM 'Alex Zinenko' via MLIR <<a href="mailto:mlir@tensorflow.org" target="_blank">mlir@tensorflow.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr">I would be interested in practical aspects:<div>- practical connection between MLIR's LLVM dialect and actual LLVM IR: having a machine-readable definition of instructions, tracking changes, altering the semantics in the dialect wrt LLVM IR;</div><div>- using MLIR dialects as a testbed for proposed LLVM IR changes (there were proposals of tensor types for LLVM for example).</div><div><br></div><div>This may be partially orthogonal, but may be interesting:</div><div>- using MLIR for loop optimization and other higher-level transformations, e.g. doing LLVM->Polly->MLIR Affine->LLVM.</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 15, 2019 at 1:27 AM Mehdi Amini <<a href="mailto:aminim@google.com" target="_blank">aminim@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><span>Hey all,</span></div><div><span><br></span></div><div><span>FYI the round-table will be </span><span>Tuesday, Oct 22, 10:20-11:30, see here: </span><a href="http://llvm.org/devmtg/2019-10/#round" target="_blank">http://llvm.org/devmtg/2019-10/#round</a></div><div><span><br></span></div><div><span>It would be nice to have an agenda now, what are your thoughts on topics we should cover?</span></div><div><span><br></span></div><div><span>Cheers,</span></div><div><span><br></span></div><div><span>-- </span></div><div><span>Mehdi</span></div><div><span><br></span></div></div>
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