Concurrent Prolog Compiler on Top of Prolog

A Concurrent Prolog compiler, whose target language is (sequential) Prolog, was implemented in Prolog. The object program obtained can further be compiled into machine codes by a Prolog compiler. Due to the similarity among the source, target and implementation languages, the compiler and the runtime support were small and very rapidly developed. Benchmark tests showed that (twice) compiled Concurrent Prolog programs ran 2.7 to 4.4 times faster and 2.7 to 5.3 times slower than comparable Prolog programs running on the interpreter and compiler, respectively, of the same Prolog system. After these experiments, the Concurrent Prolog compiler was modified to obtain a compiler of the new parallel logic programming language, GHC (Guarded Horn Clauses), and almost the same efficiency was achieved. These compilers will serve for practice of parallel logic programming.