MULA.W	R9, R6, R1, g      // ERROR "invalid .W suffix"
	MULS.S	R2, R3, R4, g      // ERROR "invalid .S suffix"

	STREX	R1, (R0)           // ERROR "illegal combination"
	STREX	(R1), R0           // ERROR "illegal combination"
	STREX	R1, (R0), R1       // ERROR "cannot use same register as both source and destination"
	STREX	R1, (R0), R0       // ERROR "cannot use same register as both source and destination"

			default:
				prog.From = a[0]
				prog.Reg = p.getRegister(prog, op, &a[1])
				prog.To = a[2]
			}
		case sys.ARM:
			// Special cases.
			if arch.IsARMSTREX(op) {
				/*
					STREX x, (y), z
						from=(y) reg=x to=z
				*/
				prog.From = a[1]
				prog.Reg = p.getRegister(prog, op, &a[0])
				prog.To = a[2]
				break
			}
			if arch.IsARMBFX(op) {