} X[rd] = bitcount Included in Extension Minimum version Lifecycle state Zknd (RV32) v1.0.0 Ratified Zkn (RV32) v1.0.0 Ratified Zkn (RV64) v1.0.0 Ratified Zkn v1.0.0 Ratified Zkn (RV64) v1.0.0 Ratified Zbkb 1.0 Ratified Zvknhb 1.0 Ratified Zabha 1.0 Ratified Zilsd 1.0 Ratified Zvbb 1.0 Ratified Zabha 1.0 Ratified F 2.2 Ratified D 2.2 Ratified C 2.0 Ratified Zmmul 1.0 Ratified Zabha 1.0 Ratified B 1.0 Ratified Zvkned 1.0 Ratified Zilsd 1.0 Ratified Zvbc 1.0 Ratified Zilsd 1.0 Ratified Zbkb (Bit-manipulation for Cryptography) v1.0 Ratified Zbkc 1.0 Ratified Zicfilp 1.0 Ratified Zvbc 1.0 Ratified Zfhmin 1.0 Ratified M 2.0 Ratified Zmmul
oversimplified