Research Posters Archive

Agile Acceleration of LLVM Flang Support for Fortran 2018 Parallel Programming

Authors: Katherine Rasmussen and Damian Rouson (Lawrence Berkeley National Laboratory (LBNL)); Najé George (San Diego State University); and Dan Bonachea, Hussain Kadhem, and Brian Friesen (Lawrence Berkeley National Laboratory (LBNL))

Abstract: The LLVM Flang compiler ("Flang") is currently Fortran 95 compliant, and the frontend can parse Fortran 2018. However, Flang does not have a comprehensive 2018 test suite and does not fully implement the static semantics of the 2018 standard. We are investigating whether agile software development techniques, such as pair programming and test-driven development (TDD), can help Flang to rapidly progress to Fortran 2018 compliance. Because of the paramount importance of parallelism in high-performance computing, we are focusing on Fortran’s parallel features, commonly denoted “CoArray Fortran". We are developing what we believe are the first exhaustive, open-source tests for the static semantics of Fortran 2018 parallel features, and contributing them to the LLVM project. A related effort involves writing runtime tests for parallel 2018 features and supporting those tests by developing a new parallel runtime library: the CoArray Fortran Framework of Efficient Interfaces to Network Environments (Caffeine).

Best Poster Finalist (BP): no

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