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

Finkel, Hal J. via llvm-dev llvm-dev at lists.llvm.org
Sat Jan 11 11:58:18 PST 2020

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.


On 1/11/20 12:52 PM, Prashanth N R via llvm-dev wrote:

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.


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

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Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory
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