year19-fast.hrm

-- HUMAN RESOURCE MACHINE PROGRAM --

-- 19: Countdown

-- INSTRUCTIONS: "For each number in the INBOX, send that number to the
-- OUTBOX, followed by all numbers down to (or up to) zero. It's
-- a countdown!"

-- AVAILABLE COMMANDS: INBOX, OUTBOX, COPYFROM, COPYTO, ADD, SUB,
-- BUMPUP, BUMPDN, JUMP, JUMPZ, JUMPN, COMMENT

-- SIZE: 30 commands (challenge 10)
-- AVERAGE RUNTIME: 70 steps (challenge 82)


-- The first item is always greater than 1.
    INBOX
    COPYTO   0
    OUTBOX
    BUMPDN   0
a:
    OUTBOX
    BUMPDN   0
    JUMPZ    b
    JUMP     a
b:
    OUTBOX

-- The second item is always less than -1.
    INBOX
    COPYTO   0
    OUTBOX
    BUMPUP   0
c:
    OUTBOX
d:
    BUMPUP   0
    JUMPZ    e
    JUMP     c
e:
    OUTBOX

-- The third item is always 0.
    INBOX
f:
g:
    OUTBOX

-- The last item varies.
    INBOX
    JUMPZ    g
    COPYTO   0
    OUTBOX
    COPYFROM 0
    JUMPN    d
h:
    BUMPDN   0
    JUMPZ    f
    OUTBOX
    JUMP     h


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