Whilst doing a casual sweep for low-hanging NetBSD merge fruit I came across the following: http://mail-index.netbsd.org/tech-net/2002/08/17/0001.html http://mail-index.netbsd.org/tech-net/2002/08/17/0002.html thorpej claims a performance increase on ARM (and possibly other RISC platforms) from unrolled copies. BMS