[llvm-dev] FC : A MLIR+LLVM based Fortran front end

River Riddle via llvm-dev llvm-dev at lists.llvm.org
Mon Jan 13 14:42:12 PST 2020

On Mon, Jan 13, 2020 at 1:13 PM Prashanth N R via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi-
> The code has been open sourced at
> https://github.com/compiler-tree-technologies. There are two repositories.
> 1. The Fortran front end, aka FC, at
> https://github.com/compiler-tree-technologies/fc.
> 2. Associated LLVM changes including MLIR at
> https://github.com/compiler-tree-technologies/llvm-project.


(disclaimer: I can’t say much about the Fortran side, but I did look at
some of the MLIR bits)

I took a look at the repos, and would love for you(+your team) to upstream
any of the general MLIR bits you can. Feel free to add me as a reviewer. (I
also went ahead and fixed one of your issues).

I look forward to collaborating with you more!

— River

> Build instructions are given at the website. There is a document at
> https://github.com/compiler-tree-technologies/fc/blob/master/docs/FC_MLIR.pdf which
> gives low level implementation details. As the week progresses, we might
> clean up the code and upstream. In the meantime, if there are any
> questions, please do let me know.
> thanks,
> -Prashanth
> On Mon, Jan 13, 2020 at 11:17 AM Chris Lattner <clattner at nondot.org>
> wrote:
>> 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?
>> -Chris
>> On Jan 11, 2020, at 11:58 AM, Finkel, Hal J. via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>> Hi, Prashanth,
>> 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.
>>  -Hal
>> On 1/11/20 12:52 PM, Prashanth N R via llvm-dev wrote:
>> Hi-
>> 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.
>> 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.
>> Entire code is in the spirit of LLVM. If the community is interested, we
>> would like to work with the community and move forward.
>> thanks,
>> -Prashanth
>> PS: We did try to use F18 for a while and hit the issues raised in [2],
>> [3].
>> 1. http://lists.llvm.org/pipermail/llvm-dev/2019-August/134620.html
>> 2. http://lists.llvm.org/pipermail/llvm-dev/2020-January/138069.html
>> 3.
>> http://lists.llvm.org/pipermail/flang-dev/attachments/20191202/6e7c1e51/attachment-0001.pdf
>> OR http://lists.llvm.org/pipermail/flang-dev/2019-December/000089.html
>> _______________________________________________
>> LLVM Developers mailing listllvm-dev at lists.llvm.orghttps://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> --
>> Hal Finkel
>> Lead, Compiler Technology and Programming Languages
>> Leadership Computing Facility
>> Argonne National Laboratory
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
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Thank you,
River Riddle
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