###########  fib
# 
jit fib 0
arg 0
int 2
ifge 5
# less than 2
int 1
return

# 2 or more
5
arg 0
int 1
sub
call fib 1

arg 0
int 2
sub
call fib 1

add
return
end
#
######################
#
int 1
call fib 1
return