case MOVDQU:
		if countPrefix(&inst, 0xF3) > 1 {
			unmarkImplicit(&inst, 0xF3)
			markLastImplicit(&inst, 0xF3)
		}

	case MOVQ2DQ:
		markLastImplicit(&inst, PrefixDataSize)

	case SLDT, SMSW, STR, FXRSTOR, XRSTOR, XSAVE, XSAVEOPT, CMPXCHG8B:
		if isMem(inst.Args[0]) {
			unmarkImplicit(&inst, PrefixDataSize)
		}

	case SYSEXIT:
		unmarkImplicit(&inst, PrefixDataSize)
	}