Automatic Detection of MPI Assertions.

The 2019 MPI standard draft specification includes the addition of defined communicator info hints. These hints are assertions that an application makes to an MPI implementation, so that a more optimized implementation is possible. The 2019 draft specifications defines four assertions: mpi_assert_no_any_tag, mpi_assert_no_any_source, mpi_assert_exact_length and mpi_assert_allow_overtaking. In this paper we will explore the capability of a Clang/LLVM based static analysis to check whether these assertions hold for a given program. With this tool, existing codebases can benefit from this new addition to the MPI standard without the need for costly human intervention.