You are correct in saying that ISA doesn't matter. The only difference is that it is easier to do 8 instruction parallel pre-fetcher on ARM or another fixed le

You are correct in saying that ISA doesn't matter. The only difference is that it is easier to do 8 instruction parallel pre-fetcher on ARM or another fixed length instruction architecture than on x86_64, and decoding more instructions can be better for re-ordering and register renaming.