An extra byte to eliminate a MOV via a 3-register instruction is a no-brainer savings. The extra 16 registers are going to be a lot more fun though. It will al

An extra byte to eliminate a MOV via a 3-register instruction is a no-brainer savings. The extra 16 registers are going to be a lot more fun though. It will also eliminate a lot of those MOVs, but every access will have a 17% penalty going from 5 to 6 bytes. Meanwhile, ARM/RISC-V can use 32 registers and use 3-register assignments with just 2/4 bytes.