The Free On-line Dictionary of Computing (30 December 2018):

AMPL

    Along with mpl, the intrinsic parallel languages
   for MasPar's computers.  AMPL and mpl are parallel variants
   of C.  Ampl is actually now a gcc port.

   ["AMPL: Design, Implementation and Evaluation of a
   Multiprocessing Language", R. Dannenberg, CMU 1981].

   ["Loglan Implementation of the AMPL Message Passing System",
   J. Milewski SIGPLAN Notices 19(9):21-29 (Sept 1984)].

   [Are these the same language?]

   (1995-11-01)