The difference is a lot when put into proper perspective. Average x86 instruction length is 4.25 bytes. ARM64 is 32-bits. RISC-V compressed was a little under

The difference is a lot when put into proper perspective. Average x86 instruction length is 4.25 bytes. ARM64 is 32-bits. RISC-V compressed was a little under 3 bytes around 10 years ago when introduced. So if RISC-V instruction length is 30% shorter than x86, why wasn't RISC-V density get a similar boost? x86 has some relatively common instructions that RISC-V didn't have even just a year or two ago. There are still some things that take 4-6 instructions in RISC-V, but just 1-2 instructions in x86 or ARM64. Over time, the code density of RISC-V will increase. Meanwhile, stuff like APX seems to require very long instructions, so compilers will be playing an interesting game where more registers and 3-register instructions decrease MOVs, but the length of the instructions also shoots up a lot.