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

Chris Lattner via llvm-dev llvm-dev at lists.llvm.org
Sun Jan 12 21:47:51 PST 2020

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?


> 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 <http://lists.llvm.org/pipermail/llvm-dev/2019-August/134620.html>
>> 2. http://lists.llvm.org/pipermail/llvm-dev/2020-January/138069.html <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 <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 <http://lists.llvm.org/pipermail/flang-dev/2019-December/000089.html>
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> -- 
> Hal Finkel
> Lead, Compiler Technology and Programming Languages
> Leadership Computing Facility
> Argonne National Laboratory
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