For PDP-10, because it operated only on word values, you can easily assume that every bus and memory operation passes a full 36 bit word every time. In fact, r

For PDP-10, because it operated only on word values, you can easily assume that every bus and memory operation passes a full 36 bit word every time. In fact, recent-ish x86 CPUs have similar instructions, and as of Zen4 they are fast not just on Intel but also on AMD (previously they were microcoded as a bunch of shifts AFAIK with pretty lousy latency)