if p == PrefixPT || p == PrefixPN {
				inst.Prefix[i] |= PrefixImplicit
			}
		}
	}

	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,

	FLDL2T:          "FLDL2T",
	FLDLG2:          "FLDLG2",
	FLDLN2:          "FLDLN2",
	FLDPI:           "FLDPI",
	FLDZ:            "FLDZ",
	FMUL:            "FMUL",
	FMULP:           "FMULP",
	FNCLEX:          "FNCLEX",
	FNINIT:          "FNINIT",
	FNOP:            "FNOP",
	FNSAVE:          "FNSAVE",
	FNSTCW:          "FNSTCW",
	FNSTENV:         "FNSTENV",
	FNSTSW:          "FNSTSW",

	//TODO: FMULL (BX)                      // dc0b
	//TODO: FMULL (R11)                     // 41dc0b
	//TODO: FMULP F0, F2                    // deca
	//TODO: FMULP F0, F3                    // decb
	//TODO: FNCLEX                          // dbe2
	//TODO: FNINIT                          // dbe3
	FNOP                                    // d9d0
	//TODO: FNSAVEL (BX)                    // dd33