Execution mode management and CU/PE overlap in an SIMD/SPMD parallel language/compiler

Language constructs (and their implementations) for execution mode management and achieving the overlap of control unit and processor operations in an explicitly parallel programming language are described. These are targeted to reconfigurable parallel processing systems, where the machine´s processors are capable of operating in both the single-instruction-multiple data (SIMD) and single program-multiple data (SPMD) modes of parallelism. The SPMD mode of parallelism is a subset of the multiple instruction-multiple data (MIMD) mode where all processors execute the same program. By providing all aspects of the language with an SIMD and an SPMD version that are syntactically and semantically equivalent, the language facilitates experimentation with and exploitation of hybrid SIMD/SPMD machines