push 6
call fibonacci
output
halt
#
# f(n) = f(n-1) + f(n-2)
# f(0) = 1
# f(1) = 1
#
:fibonacci
var n
pop $n
push $n
branch_not_zero gt0
push 1
return
:gt0
push $n
dec
branch_not_zero gt1
push 1
return
:gt1
push $n
dec
call fibonacci
push $n
dec
dec
call fibonacci
add
return