In the case of RISC-V, the compressed extension only covers a subset of the full length instructions, but can be freely intermixed with them. It turns out that

In the case of RISC-V, the compressed extension only covers a subset of the full length instructions, but can be freely intermixed with them. It turns out that RV64GC (risc-v 64 bit with compressed instructions) usually beats x86_64 in dynamic instruction bytes. See slide 31: https://riscv.org/wp-content/uploads/2016/07/Tue1130celio-fusion-finalV2.pdf https://riscv.org/wp-content/uploads/2016/07/Tue1130celio-fu...