32 bit RISC-V code density is slightly worse than Thumb2, but better than any other 32 bit ISA I'm aware of with similar performance. I don't know much about AV

32 bit RISC-V code density is slightly worse than Thumb2, but better than any other 32 bit ISA I'm aware of with similar performance. I don't know much about AVR32 except that it is very dead. Some ISAs designed explicitly for microcontroller use have denser code than RISC-V and Thumb2 on things such as manipulating GPIOs, but not on algorithmic code which makes up the vast majority of any application over a few KB in size. 64 bit RISC-V code density is far better than 64 bit ARM code density, which is similar to AMD64 (i.e. quite a bit bigger than i386) Other than a few extra instructions to zero-extend 32 bit values to 64 bits at times, 64 bit RISC-V and 32 bit RISC-V code are identical in size. High performance general computing these days means 64 bit, and RISC-V has by far the highest code density of any 64 bit ISA.