// Generate mapping when function is first called.
		riscv64SpecialOperand = map[string]riscv.SpecialOperand{}
		for opd := riscv.SPOP_BEGIN; opd < riscv.SPOP_END; opd++ {
			riscv64SpecialOperand[opd.String()] = opd
		}
	}
	if opd, ok := riscv64SpecialOperand[name]; ok {
		return opd
	}
	return riscv.SPOP_END
}

// RISCV64ValidateVectorType reports whether the given configuration is a
// valid vector type.