> And NanoMips requires instructions to be word aligned just like everybody else, it's just that it requires 16 bit alignment rather than 32. Attempting to access an odd PC address will result in an access error according to this:
Right, and I mentioned RISC-V as yet another sane RISC architecture that requires word alignment in instruction access. But the fact that it requires alignment means that the word size has implications for the instruction cache design and the complexity of the piping there.
I don't have a strong opinion on whether the C extension is a net good or bad for high performance designs, but I do strongly believe that it comes with costs as well as benefits.
That's the same as RV-C.