Let us not forget SPARC's register windows. I don't know if you could say RISC-V was optimized, as such, for undergraduate courses, but historically that was i

Let us not forget SPARC's register windows. I don't know if you could say RISC-V was optimized, as such, for undergraduate courses, but historically that was its design target. That said, there was a lot more attention to extensibility via regularized instruction set extensions than the undergraduate target demanded. RISC-V's permanently-zero register is akin to other RISCs' special multiplication registers.