prog.From = a[0]
				prog.AddRestSource(a[1])
				prog.Reg = p.getRegister(prog, op, &a[2])
				prog.To = a[3]
				break
			}
			if arch.IsARMMULA(op) {
				// All must be registers.
				p.getRegister(prog, op, &a[0])
				r1 := p.getRegister(prog, op, &a[1])
				r2 := p.getRegister(prog, op, &a[2])
				p.getRegister(prog, op, &a[3])
				prog.From = a[0]
				prog.To = a[3]