SH_RS2C
#define GET_RS2C(insn, regs) (*REG_PTR(insn, SH_RS2C, regs))
#define RVC_RS2S(insn) (8 + RV_X(insn, SH_RS2C, 3))
#define RVC_RS2(insn) RV_X(insn, SH_RS2C, 5)