Стековый процессор M17, очень хороший дизайн от Чака Мура (создателя Форта).

Цитата:The ALU on the M17 is designed to generate all possible ALU functions simultaneously, only at the last moment selecting the correct function output for writing back to the X and/or Y registers. This technique allows the ALU delay to overlap the instruction decoding ( Read more... )