This one is as infamous as it is useful. Modern CPUs have the same instruction, but without the built-in loop (fused multiply-add). Likewise, modern CPUs have

This one is as infamous as it is useful. Modern CPUs have the same instruction, but without the built-in loop (fused multiply-add). Likewise, modern CPUs have dedicated CRC instructions, ARM Thumb 2 famously has an instruction for case statements (jump tables, instructions TBB/TBH), and many more. The VAX was way ahead of its time, but failed to deliver on performance due to not having a pipelined or out-of-order architecture as is industry standard today.