panic(fmt.Sprintf("riscv64 special operand %q redefined", csrName))
			}
			riscv64SpecialOperand[csrName] = riscv.SpecialOperand(int(csrCode) + int(riscv.SPOP_CSR_BEGIN))
		}
		// Add the FENCE operands
		for opd := riscv.SPOP_FENCE_BEGIN + 1; opd < riscv.SPOP_FENCE_END; opd++ {
			riscv64SpecialOperand[opd.String()] = opd
		}
	}
	if opd, ok := riscv64SpecialOperand[name]; ok {
		return opd
	}