buf.WriteString(str)
				startArg = 3
			}
		}

	case "mtspr":
		opcode := inst.Op.String()
		buf.WriteString(opcode[0:2])
		switch spr := inst.Args[0].(type) {
		case SpReg:
			switch spr {
			case 1:
				buf.WriteString("xer")
				startArg = 1
			case 8:
				buf.WriteString("lr")
				startArg = 1
			case 9:
				buf.WriteString("ctr")
				startArg = 1

		} else if arg > Cond0SO && arg <= Cond7SO {
			return fmt.Sprintf("CR%d%s", int(arg-Cond0LT)/4, bit)
		} else {
			return fmt.Sprintf("CR%d", int(arg-CR0))
		}
	case Imm:
		return fmt.Sprintf("$%d", arg)
	case SpReg:
		switch arg {
		case 8:
			return "LR"
		case 9:
			return "CTR"
		}
		return fmt.Sprintf("SPR(%d)", int(arg))
	case PCRel:
		addr := pc + uint64(int64(arg))
		s, base := symname(addr)