To be fair, RISC-V has a small base, RV64I in the 64-bit case. These bases are small, reduced and frozen. But after that, yes, the extensions get whacky. L is Decimal Floating Point, still marked Open. I'm not sure what's reduced about that. But extensions are optional.
About the history of RISC, the basic idea dates to Seymour Cray's 1964 CDC 6600. I don't think Berkeley gives Cray enough credit.
About the history of RISC, the basic idea dates to Seymour Cray's 1964 CDC 6600. I don't think Berkeley gives Cray enough credit.