return
			}
			prog.From = a[0]
			prog.Reg = p.getRegister(prog, op, &a[1])
			prog.AddRestSource(a[2])
			prog.To = a[3]
			break
		}
		p.errorf("can't handle %s instruction with 4 operands", op)
		return
	case 5:
		if p.arch.Family == sys.PPC64 {
			prog.From = a[0]
			// Second arg is always a register type on ppc64.
			prog.Reg = p.getRegister(prog, op, &a[1])