eXplicitly Parallel C.

A dialect of Parallel C which is efficiently compilable to both SIMD and MIMD architectures. Only research implementations exist.

["Toward Semantic Self-Consistency in Explicitly Parallel Languages," M.J. Phillip & H.G. Dietz, Proc 4th Intl Conf on Supercomputing, Santa Clara, CA, May 1989, v.1, pp.398-407].