(
    (mkbf r0)

    ; Default mode - queue
    (ld @r0 1)
    (ld @r0 2)
    (ld @r0 3)
    (bfrd r1 @r0 2) (cmp r1 3 (ne? (fault))) ; last is 3
    (ld r1 @r0) (cmp r1 1 (ne? (fault)))
    (ld r1 @r0) (cmp r1 2 (ne? (fault)))
    (ld r1 @r0) (cmp r1 3 (ne? (fault)))

    (bfio @r0 BFIO_QUEUE)
    (ld @r0 1)
    (ld @r0 2)
    (ld @r0 3)
    (bfrd r1 @r0 2) (cmp r1 3 (ne? (fault))) ; last is 3
    (ld r1 @r0) (cmp r1 1 (ne? (fault)))
    (ld r1 @r0) (cmp r1 2 (ne? (fault)))
    (ld r1 @r0) (cmp r1 3 (ne? (fault)))

    (bfio @r0 BFIO_RQUEUE)
    (ld @r0 1)
    (ld @r0 2)
    (ld @r0 3)
    (bfrd r1 @r0 0) (cmp r1 3 (ne? (fault)))
    (bfrd r1 @r0 2) (cmp r1 1 (ne? (fault))) ; last is 1
    (ld r1 @r0) (cmp r1 1 (ne? (fault)))
    (ld r1 @r0) (cmp r1 2 (ne? (fault)))
    (ld r1 @r0) (cmp r1 3 (ne? (fault)))

    (bfio @r0 BFIO_STACK)
    (ld @r0 1)
    (ld @r0 2)
    (ld @r0 3)
    (bfrd r1 @r0 0) (cmp r1 1 (ne? (fault)))
    (bfrd r1 @r0 2) (cmp r1 3 (ne? (fault)))
    (ld r1 @r0) (cmp r1 3 (ne? (fault)))
    (ld r1 @r0) (cmp r1 2 (ne? (fault)))
    (ld r1 @r0) (cmp r1 1 (ne? (fault)))

    (bfio @r0 BFIO_RSTACK)
    (ld @r0 1)
    (ld @r0 2)
    (ld @r0 3)
    (bfrd r1 @r0 0) (cmp r1 3 (ne? (fault)))
    (bfrd r1 @r0 2) (cmp r1 1 (ne? (fault)))
    (ld r1 @r0) (cmp r1 3 (ne? (fault)))
    (ld r1 @r0) (cmp r1 2 (ne? (fault)))
    (ld r1 @r0) (cmp r1 1 (ne? (fault)))

    (del @r0)
)