GPUFORT: source-to-source translation from Fortran+OpenACC and CUDA Fortran

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This looks interesting but is above my head.

GPUFORT

This project develops a source to source translation tool that is able to convert:

  1. Fortran+OpenACC and CUDA Fortran → Fortran + OpenMP 4.5+
  2. Fortran+OpenACC and CUDA Fortran → Fortran + [GCC/AOMP OpenACC/MP runtime calls] + HIP C++

The result of the first translation process, can be compiled with AOMP, which has a Fortran frontend. The result of the second translation process can be compiled with hipfort or a combination of hipcc and gfortran. Note that a OpenACC runtime is only necessary for translating OpenACC code.

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Limitations

  • GPUFORT is not a compiler (yet)

GPUFORT is not intended to be a compiler. It’s main purpose is to be a translator that allows an experienced user to fix and tune the outcomes of the translation process. However, we believe GPUFORT can develop into an early-outlining compiler if enough effort is put into the project. Given that all code and especially the grammar is written in python3, GPUFORT can be developed at a quick pace.

  • GPUFORT does a bad job in analyzing what code parts can be offloaded and which ones not
  • GPUFORT does a bad job in reorganizing loops and assignments in order to maximize the available parallelism

While both would be possible as the translator works with a tree structure, we simply have not started to implement much in this direction yet.

  • GPUFORT does not implement the full OpenACC standard (yet)

GPUFORT was developed to translate a number of HPC apps to code formats that are well supported by AMD’s ROCm ecosystem. The development of GPUFORT is steered by the requirements of these applications.

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Yes. I started in Python as well with LFortran, but it’s really hard to make the parser (as well as the rest of the compiler) performing well. But as a prototype Python worked exceptionally well.

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