switch inst.Op {
	case AAA, AAS, CBW, CDQE, CLC, CLD, CLI, CLTS, CMC, CPUID, CQO, CWD, DAA, DAS,
		FDECSTP, FINCSTP, FNCLEX, FNINIT, FNOP, FWAIT, HLT,
		ICEBP, INSB, INSD, INSW, INT, INTO, INVD, IRET, IRETQ,
		LAHF, LEAVE, LRET, MONITOR, MWAIT, NOP, OUTSB, OUTSD, OUTSW,
		PAUSE, POPA, POPF, POPFQ, PUSHA, PUSHF, PUSHFQ,
		RDMSR, RDPMC, RDTSC, RDTSCP, RET, RSM,
		SAHF, STC, STD, STI, SYSENTER, SYSEXIT, SYSRET,
		UD2, WBINVD, WRMSR, XEND, XLATB, XTEST:

	case CVTSI2SD, CVTSI2SS:
		if !isMem(inst.Args[1]) {
			markLastImplicit(&inst, PrefixDataSize)
		}

	case CVTSD2SI, CVTSS2SI, CVTTSD2SI, CVTTSS2SI,
		ENTER, FLDENV, FNSAVE, FNSTENV, FRSTOR, LGDT, LIDT, LRET,
		POP, PUSH, RET, SGDT, SIDT, SYSRET, XBEGIN:
		markLastImplicit(&inst, PrefixDataSize)

	case LOOP, LOOPE, LOOPNE, MONITOR:
		markLastImplicit(&inst, PrefixAddrSize)

	case MOV:

	/*10870*/ uint16(xMatch),
	/*10871*/ uint16(xSetOp), uint16(LEAVE),
	/*10873*/ uint16(xMatch),
	/*10874*/ uint16(xSetOp), uint16(LRET),
	/*10876*/ uint16(xReadIw),
	/*10877*/ uint16(xArgImm16u),
	/*10878*/ uint16(xMatch),
	/*10879*/ uint16(xSetOp), uint16(LRET),
	/*10881*/ uint16(xMatch),
	/*10882*/ uint16(xSetOp), uint16(INT),
	/*10884*/ uint16(xArg3),
	/*10885*/ uint16(xMatch),