Source : Free On-Line Dictionary of Computing

GNU superoptimiser
     
        (GSO) A function sequence generator that uses an exhaustive
        generate-and-test approach to find the shortest instruction
        sequence for a given function.  Written by Torbjorn Granlund
         and Tom Wood.  You have to tell the
        superoptimiser which function and which {CPU} you want to get
        code for.  This is useful for compiler writers.
     
        FTP superopt-2.2.tar.Z from a {GNU archive site}.
     
        Generates code for {DEC} {Alpha}, {SPARC}, {Intel 80386},
        {88000}, {RS/6000}, {68000}, {29000} and {Pyramid} (SP, AP and
        XP).
     
        (1993-02-16)