Foreign Function Calls
av_narrow
    n = 00000040
    w = 00000011 00000011 00000011 00000011
    p = 00000011 00000011
    s = Hi mom!
    popcount = 8
av_wide
    n = 00000040
    w = 00000011 00000011 00000011 00000011
    p = 00000011 00000011
    s = Hi mom!
    ~w = ffffffee ffffffee ffffffee ffffffee
av_poly
    n = 00000060
    w = ffffffee ffffffee ffffffee ffffffee
    p = 00000011 00000011 00000011
    s = Hi mom!
    ~p = ffffffee ffffffee ffffffee