<div dir="ltr"><div dir="ltr"><div dir="ltr">Neat, another fortran compiler option.<div><br></div><div>Does anyone have a list/comparison of all the LLVM fortran compilers? I'm not really tracking this, since Fortran isn't really my area of expertise, but I've seen the following. Perhaps there are even more?<div><div><br></div><div>"Flang". The original of the name, I think? Abandoned.<br><a href="https://github.com/llvm-flang/flang" target="_blank">https://github.com/llvm-flang/flang</a><br>"Fort" -- fork of the above flang, renamed. Seems active.<br><a href="https://github.com/llvm-fortran/fort/" target="_blank">https://github.com/llvm-fortran/fort/</a><br><br></div><div>"Flag". Different from the other "flang". Active, but deprecated in favor of f18.</div><div><a href="https://github.com/flang-compiler/flang" target="_blank">https://github.com/flang-compiler/flang</a><br></div><div>"f18". Rewrite-from-scratch (?) of adjacent "flang". Active, but not fully-functional yet (I think?).</div><div><a href="https://github.com/flang-compiler/f18" target="_blank">https://github.com/flang-compiler/f18</a><br></div><div><br></div><div><div>"FC". Newly-developed, independent of the other compilers. Active. (But this source-code dates from the previous announcement, not yet updated with latest developments):<br><a href="https://github.com/compiler-tree-technologies/fc" target="_blank">https://github.com/compiler-tree-technologies/fc</a><br></div><div></div><div></div></div><div><br></div><div>I don't know how any of these compare with each other, nor why we have so many. I have no opinion on which or whether any of these should be "blessed", nor do I really want to become educated enough on this topic to gain such an opinion personally.</div><div><br></div><div>But, given that there appear to be at least 3 fortran compilers under active development by different people, I would love to be reassured that such a comparison has been done, and that we are selecting one of them for good reasons. It'd be great if someone (or multiple someones) could post a summary/comparison of what these things all are, and why one is the right path forward vs another.</div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 13, 2020 at 2:46 AM Prashanth N R via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi Chris-<div>We are mostly cleaning up the code for open sourcing. Early code drop will happen in a day or two and will continue through this week. We would love to work with the rest of the community on this. </div><div><br></div><div>thanks,</div><div>-Prashanth</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 13, 2020 at 11:17 AM Chris Lattner <<a href="mailto:clattner@nondot.org" target="_blank">clattner@nondot.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Agreed! Is the code already available? What are your plans for it, and are you interested in collaboration with the rest of the LLVM community?<div><br></div><div>-Chris<br><div><br><blockquote type="cite"><div>On Jan 11, 2020, at 11:58 AM, Finkel, Hal J. via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:</div><br><div>
<div><p>Hi, Prashanth,</p><p>That's great news! It sounds like you've made a lot of progress, and I certainly hope that you can make your source available under the LLVM license and that we can all work together going forward.</p><p> -Hal<br>
</p>
<div>On 1/11/20 12:52 PM, Prashanth N R via llvm-dev wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi-
<div><br>
</div>
<div>In August we made an announcement of "FC: A new fortran front end" [1]. At that time to get an end-to-end solution, we made FC to emit LLVM IR directly. At present, we have upgraded FC to emit MLIR. Currently the language supported is close to Fortran-95.
Apart from 400+ unit test cases, out framework passes two SPEC-2017 benchmarks successfully. Currently we are cleaning up the code and plan to open source the same in a week or so.</div>
<div><br>
</div>
<div>Apart from the front end changes, we have defined a new high level dialect in MLIR for representing Fortran. We have defined a new Loop Nest Optimization framework along with one Loop Nest Optimization in it for the time being. Also we have supported 4
OpenMP constructs and way to express the same in MLIR framework. </div>
<div><br>
</div>
<div>Entire code is in the spirit of LLVM. If the community is interested, we would like to work with the community and move forward. </div>
<div><br>
</div>
<div>thanks,</div>
<div>-Prashanth</div>
<div><br>
</div>
<div>PS: We did try to use F18 for a while and hit the issues raised in [2], [3].</div>
<div><br>
</div>
<div>1. <a href="http://lists.llvm.org/pipermail/llvm-dev/2019-August/134620.html" target="_blank">http://lists.llvm.org/pipermail/llvm-dev/2019-August/134620.html</a></div>
<div>2. <a href="http://lists.llvm.org/pipermail/llvm-dev/2020-January/138069.html" target="_blank">http://lists.llvm.org/pipermail/llvm-dev/2020-January/138069.html</a></div>
<div>3. <a href="http://lists.llvm.org/pipermail/flang-dev/attachments/20191202/6e7c1e51/attachment-0001.pdf" target="_blank">http://lists.llvm.org/pipermail/flang-dev/attachments/20191202/6e7c1e51/attachment-0001.pdf</a></div>
<div>OR <a href="http://lists.llvm.org/pipermail/flang-dev/2019-December/000089.html" target="_blank">http://lists.llvm.org/pipermail/flang-dev/2019-December/000089.html</a></div>
<div><br>
</div>
</div>
<br>
<fieldset></fieldset>
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<pre cols="72">--
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory</pre>
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