File: fibo.tlc.src

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main:
    PUSH 0
    PUSH 1
    PUSHARG

loop:           # [a, b, n]
    PUSH 1
    SUB         # [a, b, n-1]
    PICK 0
    BR_COND true
    PUSH 1
    BR_COND exit

true:           # [a, b, n]
    SWAP
    ROLL 3      # [n, b, a]
    PICK 1      # [n, b, a, b]
    ADD         # [n, b, a+b]
    ROLL 3      # [b, a+b, n]

    PUSH 1
    BR_COND loop

exit:           # [a, b, 0]
    POP
    RETURN