On Thu, Aug 29, 2013 at 10:26:32AM +0200, Lars-Peter Clausen wrote:
> A register which is adjacent to a node will either be left to the first
> register or right to the last register. It will not be within the node's range,
> so there is no point in checking for each register cached by the node whether
> the new register is next to it. It is sufficient to check whether the register
> comes before the first register or after the last register of the node.

Applied all, thanks.