> Only difference being that you need to do a bit more work to determine negativeness (work which in hardware you'd already likely have the bulk of for determin

> Only difference being that you need to do a bit more work to determine negativeness (work which in hardware you'd already likely have the bulk of for determining is-zero). The work needed to calculate the overflow flag (done in every add/sub operation in most ISAs) is also way more complicated when the high bit does not represent sign.