This dialect models the Message Passing Interface (MPI), version 4.0. It is meant to serve as an interfacing dialect that is targeted by higher-level dialects. The MPI dialect itself can be lowered to multiple MPI implementations and hide differences in ABI. The dialect models the functions of the MPI specification as close to 1:1 as possible while preserving SSA value semantics where it makes sense, and uses memref types instead of bare pointers.
