| AAA | 37 | n/a | ASCII adjust after addition. | 86 |
| AAD | D5 0A | n/a | ASCII adjust AX before division. | 86 |
| AAM | D4 0A | n/a | ASCII adjust AX after multiply. | 86 |
| AAS | 3F | n/a | ASCII adjust AL after subtraction. | 86 |
| ADC | 14 ib | AL, imm8 | Add two integers with carry. | 86 |
| ADC | 15 iv | eAX, imm | Add two integers with carry. | 86/386 |
| ADC | 81 /2 iv | r/m, imm | Add two integers with carry. | 86/386 |
| ADC | 83 /2 ib | r/m, imm8 | Add two integers with carry. | 86/386 |
| ADC | 11 /r | r/m, r | Add two integers with carry. | 86/386 |
| ADC | 80 /2 ib | r/m8, imm8 | Add two integers with carry. | 86 |
| ADC | 82 /2 ib | r/m8, imm8 | Add two integers with carry. | 86 |
| ADC | 10 /r | r/m8, r8 | Add two integers with carry. | 86 |
| ADC | 13 /r | r, r/m | Add two integers with carry. | 86/386 |
| ADC | 12 /r | r8, r/m8 | Add two integers with carry. | 86 |
| ADD | 04 ib | AL, imm8 | Add two integers. | 86 |
| ADD | 05 iv | eAX, imm | Add two integers. | 86/386 |
| ADD | 81 /0 iv | r/m, imm | Add two integers. | 86/386 |
| ADD | 83 /0 ib | r/m, imm8 | Add two integers. | 86/386 |
| ADD | 01 /r | r/m, r | Add two integers. | 86/386 |
| ADD | 80 /0 ib | r/m8, imm8 | Add two integers. | 86 |
| ADD | 82 /0 ib | r/m8, imm8 | Add two integers. | 86 |
| ADD | 00 /r | r/m8, r8 | Add two integers. | 86 |
| ADD | 03 /r | r, r/m | Add two integers. | 86/386 |
| ADD | 02 /r | r8, r/m8 | Add two integers. | 86 |
| ADDPD | 66 0F 58 /r | xmm1, xmm2/m128 | Add packed dble-prec. floats. | SSE2 |
| ADDPS | 0F 58 /r | xmm1, xmm2/m128 | Add packed sngle-prec. floats. | SSE |
| ADDSD | F2 0F 58 /r | xmm1, xmm2/m64 | Add scalar dble-prec. floats. | SSE |
| ADDSS | F3 0F 58 /r | xmm1, xmm2/m32 | Add scalar sngle-prec. floats. | SSE |
| ADDSUBPD | 66 0F D0 /r | xmm1, xmm2/m128 | Add/Sub packed dble-prec. floats. | SSE3 |
| ADDSUBPS | F2 0F D0 /r | xmm1, xmm2/m128 | Add/Sub packed sngle-prec. floats. | SSE3 |
| AND | 24 ib | AL, imm8 | Bitwise AND of two integers. | 86 |
| AND | 25 iv | eAX, imm | Bitwise AND of two integers. | 86/386 |
| AND | 81 /4 iv | r/m, imm | Bitwise AND of two integers. | 86/386 |
| AND | 83 /4 ib | r/m, imm8 | Bitwise AND of two integers. | 86/386 |
| AND | 21 /r | r/m, r | Bitwise AND of two integers. | 86/386 |
| AND | 80 /4 ib | r/m8, imm8 | Bitwise AND of two integers. | 86 |
| AND | 82 /4 ib | r/m8, imm8 | Bitwise AND of two integers. | 86 |
| AND | 20 /r | r/m8, r8 | Bitwise AND of two integers. | 86 |
| AND | 23 /r | r, r/m | Bitwise AND of two integers. | 86/386 |
| AND | 22 /r | r8, r/m8 | Bitwise AND of two integers. | 86 |
| ANDNPD | 66 0F 55 /r | xmm1, xmm2/m128 | Bitwise AND NOT of packed dble-prec. floats. | SSE2 |
| ANDNPS | 0F 55 /r | xmm1, xmm2/m128 | Bitwise AND NOT of packed sngle-prec. floats. | SSE |
| ANDPD | 66 0F 54 /r | xmm1, xmm2/m128 | Bitwise AND of packed dble-prec. floats. | SSE2 |
| ANDPS | 0F 54 /r | xmm1, xmm2/m128 | Bitwise AND of packed sngle-prec. floats. | SSE |
| ARPL | 63 /r | r/m16, r16 | Adjust RPL of field of segment selector. | 286 |
| BOUND | 62 /r | r, m | Check array index against bounds. | 186 |
| BSF | 0F BC /r | r, r/m | Scan for the least significant bit. | 386 |
| BSR | 0F BD /r | r, r/m | Scan for the most significant bit. | 386 |
| BSWAP | 0F C8 | EAX | Reverses the byte order of 32-bit register. | 486 |
| BSWAP | 0F CD | EBP | Reverses the byte order of 32-bit register. | 486 |
| BSWAP | 0F CB | EBX | Reverses the byte order of 32-bit register. | 486 |
| BSWAP | 0F C9 | ECX | Reverses the byte order of 32-bit register. | 486 |
| BSWAP | 0F CF | EDI | Reverses the byte order of 32-bit register. | 486 |
| BSWAP | 0F CA | EDX | Reverses the byte order of 32-bit register. | 486 |
| BSWAP | 0F CE | ESI | Reverses the byte order of 32-bit register. | 486 |
| BSWAP | 0F CC | ESP | Reverses the byte order of 32-bit register. | 486 |
| BT | 0F BA /4 ib | r/m, imm8 | Extract a bit to CF. | 386 |
| BT | 0F A3 /r | r/m, r | Extract a bit to CF. | 386 |
| BTC | 0F BA /7 ib | r/m, imm8 | Extract a bit to CF and complement it. | 386 |
| BTC | 0F BB /r | r/m, r | Extract a bit to CF and complement it. | 386 |
| BTR | 0F BA /6 ib | r/m, imm8 | Extract a bit to CF and reset it. | 386 |
| BTR | 0F B3 | r/m, r | Extract a bit to CF and reset it. | 386 |
| BTS | 0F BA /5 ib | r/m, imm8 | Extract a bit to CF and set it. | 386 |
| BTS | 0F AB | r/m, r | Extract a bit to CF and set it. | 386 |
| CALL | 9A iv 1w | imm16:imm | A far, absolute call to a subroutine. | 86 |
| CALL | FF /3 | m16:m | A far, absolute indirect call to a subroutine. | 86 |
| CALL | FF /2 | r/m | A near, absolute indirect call to a subroutine. | 86 |
| CALL | E8 iv | rel | A near, relative call to a subroutine. | 86 |
| CBW | 98 | n/a | Sign-extend AL into AX (or AX into EAX) | 86/386 |
| CWDE | 98 | n/a | Sign-extend AL into AX (or AX into EAX) | 86/386 |
| CLC | F8 | n/a | Clear CF flag | 86 |
| CLD | FC | n/a | Clear DF flag | 86 |
| CLFLUSH | 0F AE /mem|7 | m8 | Flushes cache line. | SSE2 |
| CLI | FA | n/a | Clear the IF (disable interrupts). | 86 |
| CLTS | 0F 06 | n/a | Clear the task-switched (TS) flag in CR0. | 286,PRIV |
| CMC | F5 | n/a | Complement CF flag | 86 |
| CMOVA | 0F 47 /r | r, r/m | Move if above (CF=0 and ZF=0) | P6 |
| CMOVNBE | 0F 47 /r | r, r/m | Move if above (CF=0 and ZF=0) | P6 |
| CMOVAE | 0F 43 /r | r, r/m | Move if above or equal (CF=0) | P6 |
| CMOVNB | 0F 43 /r | r, r/m | Move if above or equal (CF=0) | P6 |
| CMOVNC | 0F 43 /r | r, r/m | Move if above or equal (CF=0) | P6 |
| CMOVB | 0F 42 /r | r, r/m | Move if below (CF=1) | P6 |
| CMOVC | 0F 42 /r | r, r/m | Move if below (CF=1) | P6 |
| CMOVNAE | 0F 42 /r | r, r/m | Move if below (CF=1) | P6 |
| CMOVBE | 0F 46 /r | r, r/m | Move if below or equal (CF=1 or ZF=1) | P6 |
| CMOVNA | 0F 46 /r | r, r/m | Move if below or equal (CF=1 or ZF=1) | P6 |
| CMOVE | 0F 44 /r | r, r/m | Move if equal (ZF=1) | P6 |
| CMOVZ | 0F 44 /r | r, r/m | Move if equal (ZF=1) | P6 |
| CMOVG | 0F 4F /r | r, r/m | Move if greater (ZF=0 and SF=OF) | P6 |
| CMOVNLE | 0F 4F /r | r, r/m | Move if greater (ZF=0 and SF=OF) | P6 |
| CMOVGE | 0F 4D /r | r, r/m | Move if greater or equal (SF=OF) | P6 |
| CMOVNL | 0F 4D /r | r, r/m | Move if greater or equal (SF=OF) | P6 |
| CMOVL | 0F 4C /r | r, r/m | Move if less (SF<>OF) | P6 |
| CMOVNGE | 0F 4C /r | r, r/m | Move if less (SF<>OF) | P6 |
| CMOVLE | 0F 4E /r | r, r/m | Move if less or equal (ZF=1 or SF<>OF) | P6 |
| CMOVNG | 0F 4E /r | r, r/m | Move if less or equal (ZF=1 or SF<>OF) | P6 |
| CMOVNE | 0F 45 /r | r, r/m | Move if not equal (ZF=0) | P6 |
| CMOVNZ | 0F 45 /r | r, r/m | Move if not equal (ZF=0) | P6 |
| CMOVNO | 0F 41 /r | r, r/m | Move if not overflow (OF=0) | P6 |
| CMOVNP | 0F 4B /r | r, r/m | Move if parity odd (PF=0) | P6 |
| CMOVPO | 0F 4B /r | r, r/m | Move if parity odd (PF=0) | P6 |
| CMOVNS | 0F 49 /r | r, r/m | Move if not sign (SF=0) | P6 |
| CMOVO | 0F 40 /r | r, r/m | Move if overflow (OF=1) | P6 |
| CMOVP | 0F 4A /r | r, r/m | Move if parity even (PF=1) | P6 |
| CMOVPE | 0F 4A /r | r, r/m | Move if parity even (PF=1) | P6 |
| CMOVS | 0F 48 /r | r, r/m | Move if sign (SF=1) | P6 |
| CMP | 3C ib | AL, imm8 | Compare two integers. | 86 |
| CMP | 3D iv | eAX, imm | Compare two integers. | 86/386 |
| CMP | 81 /7 iv | r/m, imm | Compare two integers. | 86/386 |
| CMP | 83 /7 ib | r/m16, imm8 | Compare two integers. | 86/386 |
| CMP | 39 /r | r/m, r | Compare two integers. | 86/386 |
| CMP | 80 /7 ib | r/m8, imm8 | Compare two integers. | 86 |
| CMP | 82 /7 ib | r/m8, imm8 | Compare two integers. | 86 |
| CMP | 38 /r | r/m8, r8 | Compare two integers. | 86 |
| CMP | 3B /r | r, r/m | Compare two integers. | 86/386 |
| CMP | 3A /r | r8, r/m8 | Compare two integers. | 86 |
| CMPEQPD | 66 0F C2 /r 00 | xmm1, xmm2/m128 | Compare packed dble-prec. floats for equality. | SSE2 |
| CMPEQPS | 0F C2 /r 00 | xmm1, xmm2/m128 | Compare packed sngle-prec. floats for equality. | SSE |
| CMPEQSD | F2 0F C2 /r 00 | xmm1, xmm2/m64 | Compare scalar dble-prec. floats for equality. | SSE2 |
| CMPEQSS | F3 0F C2 /r 00 | xmm1, xmm2/m32 | Compare scalar sngle-prec. floats for equality. | SSE |
| CMPLEPD | 66 0F C2 /r 02 | xmm1, xmm2/m128 | Compare packed dble-prec. floats for less-than-or-equal. | SSE2 |
| CMPLEPS | 0F C2 /r 02 | xmm1, xmm2/m128 | Compare packed sngle-prec. floats for less-than-or-equal. | SSE |
| CMPLESD | F2 0F C2 /r 02 | xmm1, xmm2/m64 | Compare scalar dble-prec. floats for less-than-or-equal. | SSE2 |
| CMPLESS | F3 0F C2 /r 02 | xmm1, xmm2/m32 | Compare scalar sngle-prec. floats for less-than-or-equal. | SSE |
| CMPLTPD | 66 0F C2 /r 01 | xmm1, xmm2/m128 | Compare packed dble-prec. floats for less-than. | SSE2 |
| CMPLTPS | 0F C2 /r 01 | xmm1, xmm2/m128 | Compare packed sngle-prec. floats for less-than. | SSE |
| CMPLTSD | F2 0F C2 /r 01 | xmm1, xmm2/m64 | Compare scalar dble-prec. floats for less-than. | SSE2 |
| CMPLTSS | F3 0F C2 /r 01 | xmm1, xmm2/m32 | Compare scalar sngle-prec. floats for less-than. | SSE |
| CMPNEQPD | 66 0F C2 /r 04 | xmm1, xmm2/m128 | Compare packed dble-prec. floats for not-equal. | SSE2 |
| CMPNEQPS | 0F C2 /r 04 | xmm1, xmm2/m128 | Compare packed sngle-prec. floats for not-equal. | SSE |
| CMPNEQSD | F2 0F C2 /r 04 | xmm1, xmm2/m64 | Compare scalar dble-prec. floats for not-equal. | SSE2 |
| CMPNEQSS | F3 0F C2 /r 04 | xmm1, xmm2/m32 | Compare scalar sngle-prec. floats for not-equal. | SSE |
| CMPNLEPD | 66 0F C2 /r 06 | xmm1, xmm2/m128 | Compare packed dble-prec. floats for not-greater-than. | SSE2 |
| CMPNLEPS | 0F C2 /r 06 | xmm1, xmm2/m128 | Compare packed sngle-prec. floats for not-greater-than. | SSE |
| CMPNLESD | F2 0F C2 /r 06 | xmm1, xmm2/m64 | Compare scalar dble-prec. floats for not-greater-than. | SSE2 |
| CMPNLESS | F3 0F C2 /r 06 | xmm1, xmm2/m32 | Compare scalar sngle-prec. floats for not-greater-than. | SSE |
| CMPNLTPD | 66 0F C2 /r 05 | xmm1, xmm2/m128 | Compare packed dble-prec. floats for not-less-than. | SSE2 |
| CMPNLTPS | 0F C2 /r 05 | xmm1, xmm2/m128 | Compare packed sngle-prec. floats for not-less-than. | SSE |
| CMPNLTSD | F2 0F C2 /r 05 | xmm1, xmm2/m64 | Compare scalar dble-prec. floats for not-less-than. | SSE2 |
| CMPNLTSS | F3 0F C2 /r 05 | xmm1, xmm2/m32 | Compare scalar sngle-prec. floats for not-less-than. | SSE |
| CMPORDPD | 66 0F C2 /r 07 | xmm1, xmm2/m128 | Compare packed dble-prec. floats for being ordered. | SSE2 |
| CMPORDPS | 0F C2 /r 07 | xmm1, xmm2/m128 | Compare packed sngle-prec. floats for being ordered. | SSE |
| CMPORDSD | F2 0F C2 /r 07 | xmm1, xmm2/m64 | Compare scalar dble-prec. floats for being ordered. | SSE2 |
| CMPORDSS | F3 0F C2 /r 07 | xmm1, xmm2/m32 | Compare scalar sngle-prec. floats for being ordered. | SSE |
| CMPPD | 66 0F C2 /r ib | xmm1, xmm2/m64, imm8 | Compare packed dble-prec. floats. | SSE2 |
| CMPPS | 0F C2 /r ib | xmm1, xmm2/m32, imm8 | Compare packed sngle-prec. floats. | SSE |
| CMPSB | A6 | n/a | Compare string bytes. | 86 |
| CMPSD | F2 0F C2 /r ib | xmm1, xmm2/m64, imm8 | Compare scalar dble-prec. floats. | SSE2 |
| CMPSS | F3 0F C2 /r ib | xmm1, xmm2/m32, imm8 | Compare scalar sngle-prec. floats. | SSE |
| CMPSW | A7 | n/a | Compare string words. | 86/386 |
| CMPSD | A7 | n/a | Compare string DWs. | 86/386 |
| CMPUNORDPD | 66 0F C2 /r 03 | xmm1, xmm2/m128 | Compare packed dble-prec. floats for being ordered. | SSE2 |
| CMPUNORDPS | 0F C2 /r 03 | xmm1, xmm2/m128 | Compare packed sngle-prec. floats for being unordered. | SSE |
| CMPUNORDSD | F2 0F C2 /r 03 | xmm1, xmm2/m64 | Compare scalar dble-prec. floats for being unordered. | SSE2 |
| CMPUNORDSS | F3 0F C2 /r 03 | xmm1, xmm2/m32 | Compare scalar sngle-prec. floats for being unordered. | SSE |
| CMPXCHG | 0F B1/r | r/m, r | Compare and exchange. | P5 |
| CMPXCHG | 0F B0/r | r/m8, r8 | Compare and exchange. | P5 |
| CMPXCHG486 | 0F A7 /r | r/m, r | Undocumented alias to CMPXCHG on some old 486s. | 486, UNDOC |
| CMPXCHG486 | 0F A6 /r | r/m8, r8 | Undocumented alias to CMPXCHG on some old 486s. | 486, UNDOC |
| CMPXCHG8B | 0F C7 /mem|1 | m64 | Compare and exchange 8 bytes. | P5 |
| COMISD | 66 0F 2F /r | xmm1, xmm2/m64 | Compare scalar ordered dble-prec. floats. | SSE2 |
| COMISS | 0F 2F /r | xmm1, xmm2/m32 | Compare scalar ordered sngle-prec. floats. | SSE |
| CPUID | 0F A2 | n/a | CPU identification. | P5 |
| CVTDQ2PD | F3 0F E6 /r | xmm1, xmm2/m64 | Convert 2 packed signed DWs to 2 packed dble-prec. floats. | SSE2 |
| CVTDQ2PS | 0F 5B /r | xmm1, xmm2/m128 | Convert 4 packed signed DWs to 4 packed sngle-prec. floats. | SSE2 |
| CVTPD2DQ | F2 0F E6 | xmm1, xmm2/m128 | Convert 2 packed dble-prec. floats to 2 packed signed DWs. | SSE2 |
| CVTPD2PI | 66 0F 2D /r | mm, xmm/m128 | Convert 2 packed dble-prec. floats to 2 packed signed DWs. | SSE2 |
| CVTPD2PS | 66 0F 5A /r | xmm1, xmm2/m128 | Convert 2 packed dble-prec. floats to 2 packed sngle-prec. floats. | SSE2 |
| CVTPI2PD | 66 0F 2A /r | xmm, mm/m64 | Convert 2 packed signed DWs to 2 packed dble-prec. floats. | sse2 |
| CVTPI2PS | 0F 2A /r | xmm, mm/m64 | Convert 2 signed DWs to two sngle-prec. floats. | SSE |
| CVTPS2DQ | 66 0F 5B /r | xmm1, xmm2/m128 | Convert 4 packed sngle-prec. floats to 4 packed signed DWs. | sse2 |
| CVTPS2PD | 0F 5A /r | xmm1, xmm2/m64 | Convert 2 packed sngle-prec. floats to 2 packed dble-prec. floats. | SSE2 |
| CVTPS2PI | 0F 2D /r | mm, xmm/m64 | Convert 2 packed sngle-prec. floats to 2 packed signed DWs. | SSE |
| CVTSD2SI | F2 0F 2D /r | r32, xmm/m64 | Convert 1 dble-prec. float to 1 signed DW. | SSE2 |
| CVTSD2SS | F2 0F 5A /r | xmm1, xmm2/m64 | Convert 1 dble-prec. float to 1 sngle-prec. float. | SSE |
| CVTSI2SD | F2 0F 2A /r | xmm, r/m32 | Convert 1 signed DW to 1 dble-prec. float. | SSE2 |
| CVTSI2SS | F3 0F 2A /r | xmm, r/m32 | Convert 1 signed DW to 1 sngle-prec. float. | SSE |
| CVTSS2SD | F3 0F 5A /r | xmm1, xmm2/m32 | Convert 1 sngle-prec. float to 1 dble-prec. float. | SSE2 |
| CVTSS2SI | F3 0F 2D /r | r32, xmm/m32 | Convert 1 sngle-prec. float to 1 signed DW. | SSE |
| CVTTPD2DQ | 66 0F E6 | xmm1, xmm2/m128 | Truncate 2 packed dble-prec. floats to 2 packed signed DWs. | SSE2 |
| CVTTPD2PI | 66 0F 2C /r | mm, xmm/m128 | Truncate 2 packed dble-prec. floats to 2 packed signed DWs. | SSE2 |
| CVTTPS2DQ | F3 0F 5B /r | xmm1, xmm2/m128 | Truncate 4 packed sngle-prec. floats to 4 packed signed DWs. | SSE2 |
| CVTTPS2PI | 0F 2C /r | mm, xmm/m64 | Truncate 2 packed sngle-prec. floats to 2 signed packed DWs. | SSE |
| CVTTSD2SI | F2 0F 2C /r | r32, xmm/m64 | Truncate 1 dble-prec. float to 1 signed DW. | SSE2 |
| CVTTSS2SI | F3 0F 2C /r | r32, xmm/m32 | Convert 1 sngle-prec. float to 1 signed DW. | SSE |
| CWD | 99 | n/a | Sign-extend AX into DX:AX (or EAX into EDX:EAX). | 86/386 |
| CDQ | 99 | n/a | Sign-extend AX into DX:AX (or EAX into EDX:EAX). | 86/386 |
| DAA | 27 | n/a | Decimal adjust AL after addition | 86 |
| DAS | 2F | n/a | Decimal adjust AL after subtraction | 86 |
| DEC | 48 | eAX | Decrement integer by 1 | 86/386 |
| DEC | 4D | eBP | Decrement integer by 1 | 86/386 |
| DEC | 4B | eBX | Decrement integer by 1 | 86/386 |
| DEC | 49 | eCX | Decrement integer by 1 | 86/386 |
| DEC | 4F | eDI | Decrement integer by 1 | 86/386 |
| DEC | 4A | eDX | Decrement integer by 1 | 86/386 |
| DEC | 4E | eSI | Decrement integer by 1 | 86/386 |
| DEC | 4C | eSP | Decrement integer by 1 | 86/386 |
| DEC | FE /1 | r/m8 | Decrement integer by 1 | 86 |
| DEC | FF /1 | r/m | Decrement integer by 1 | 86/386 |
| DIV | F7 /6 | r/m | Unsigned divide eDX:eAX by the operand. | 86/386 |
| DIV | F6 /6 | r/m8 | Unsigned divide AX by the operand. | 86 |
| DIVPD | 66 0F 5E /r | xmm1, xmm2/m128 | Divide packed dble-prec. floats. | SSE2 |
| DIVPS | 0F 5E /r | xmm1, xmm2/m128 | Divide packed sngle-prec. floats. | SSE |
| DIVSD | F2 0F 5E /r | xmm1, xmm2/m64 | Divide scalar dble-prec. floats. | SSE2 |
| DIVSS | F3 0F 5E /r | xmm1, xmm2/m32 | Divide scalar sngle-prec. floats. | SSE |
| EMMS | 0F 77 | n/a | Empty MMX state. | MMX |
| ENTER | C8 iw ib | imm16, imm8 | Create a stack frame for a procedure or subroutine. | 186 |
| F2XM1 | D9 F0 | n/a | Compute 2 to the power of ST(0) ' 1. | 86,FPU |
| FABS | D9 E1 | n/a | Absolute value of ST(0). | 86,FPU |
| FADD | D8 /0 | m32 | Add sngle-prec. float to ST(0). | 86,FPU |
| FADD | DC /0 | m64 | Add dble-prec. float to ST(0). | 86,FPU |
| FADD | D8 C0+i | ST(0), ST(i) | Add ST(i) to ST(0). | 86,FPU |
| FADD | DC C0+i | ST(i), ST(0) | Add ST(0) to ST(i). | 86,FPU |
| FADDP | DE C0+i | ST(i), ST(0) | Add ST(0) to ST(i) and pop the FPU stack. | 86,FPU |
| FBLD | DF /4 | m80 | Push BCD value onto the FPU stack. | 86,FPU |
| FBSTP | DF /6 | m80 | Store ST(0) as BCD value and pop FPU stack. | 86,FPU |
| FCHS | D9 E0 | n/a | Change sign of ST(0). | 86,FPU |
| FCLEX | 9B DB E2 | n/a | Clear FPU exception flags and wait. | 86,FPU |
| FCMOVB | DA C0+i | ST(0), ST(i) | FPU move if below (CF=1) | 86,FPU |
| FCMOVBE | DA D0+i | ST(0), ST(i) | FPU move if below or equal (CF=1 or ZF=1) | 86,FPU |
| FCMOVE | DA C8+i | ST(0), ST(i) | FPU move if equal (ZF=1) | 86,FPU |
| FCMOVNB | DB C0+i | ST(0), ST(i) | FPU move if not below (CF=0) | 86,FPU |
| FCMOVNBE | DB D0+i | ST(0), ST(i) | FPU move if not below or equal (CF=0 and ZF=0) | 86,FPU |
| FCMOVNE | DB C8+i | ST(0), ST(i) | FPU move if not equal (ZF=0) | 86,FPU |
| FCMOVNU | DB D8+i | ST(0), ST(i) | FPU move if not unordered (PF=0) | 86,FPU |
| FCMOVU | DA D8+i | ST(0), ST(i) | FPU move if unordered (PF=1) | 86,FPU |
| FCOM | D8 /2 | m32 | Compare ST(0) with sngle-prec. float. | 86,FPU |
| FCOM | DC /2 | m64 | Compare ST(0) with dble-prec. float. | 86,FPU |
| FCOM | D8 D0+i | ST(i) | Compare ST(0) ST(i). | 86,FPU |
| FCOM2 | DC D0+i | ST(i) | Undocumented alias to FCOM ST(i). | 86,FPU,UNDOC |
| FCOMI | DB F0+i | ST(0), ST(i) | Compare ST(0) with ST(i) and set CPU flags. | 86,FPU |
| FCOMIP | DF F0+i | ST(0), ST(i) | Compare ST(0) with ST(i), set CPU flags and pop FPU stack. | 86,FPU |
| FCOMP | D8 /3 | m32 | Compare ST(0) with sngle-prec. float and pop FPU stack. | 86,FPU |
| FCOMP | DC /3 | m64 | Compare ST(0) with dble-prec. float and pop FPU stack. | 86,FPU |
| FCOMP | D8 D8+i | ST(i) | Compare ST(0) with ST(i) and pop FPU stack. | 86,FPU |
| FCOMP3 | DC D8+i | ST(i) | Undocumented alias to FCOMP ST(i). | 86,FPU,UNDOC |
| FCOMP5 | DE D0+i | ST(i) | Undocumented alias to FCOMP ST(i). | 86,FPU,UNDOC |
| FCOMPP | DE D9 | n/a | Compare ST(0) with ST(1) and pop FPU stack twice. | 86,FPU |
| FCOS | D9 FF | n/a | Replace ST(0) with its cosine | 386,FPU |
| FDECSTP | D9 F6 | n/a | Decrement FPU stack pointer. | 86,FPU |
| FDISI | 9B DB E1 | n/a | Disable FPU interrupts and wait. | 86,FPU |
| FDIV | D8 /6 | m32 | Divide ST(0) by sngle-prec. float. | 86,FPU |
| FDIV | DC /6 | m64 | Divide ST(0) by dble-prec. float. | 86,FPU |
| FDIV | D8 F0+i | ST(0), ST(i) | Divide ST(0) by ST(i). | 86,FPU |
| FDIV | DC F8+i | ST(i), ST(0) | Divide ST(i) by ST(0). | 86,FPU |
| FDIVP | DE F8+i | ST(i), ST(0) | Divide ST(i) by ST(0) and pop the FPU stack | 86,FPU |
| FDIVR | D8 /7 | m32 | Divide sngle-prec. float. | 86,FPU |
| FDIVR | DC /7 | m64 | Divide dble-prec. float. | 86,FPU |
| FDIVR | D8 F8+i | ST(0), ST(i) | Divide ST(i) by ST(0). | 86,FPU |
| FDIVR | DC F0+i | ST(i), ST(0) | Divide ST(0) by ST(i). | 86,FPU |
| FDIVRP | DE F0+i | ST(i), ST(0) | Divide ST(0) by ST(i) and pop the FPU stack. | 86,FPU |
| FEMMS | 0F 0E | n/a | Fast empty MMX state. | 3DNOW |
| FENI | 9B DB E0 | n/a | Enable FPU interrupts and wait. | 86,FPU |
| FFREE | DD C0+i | ST(i) | Mark ST(i) as being empty. | 86,FPU |
| FFREEP | DF C0+i | ST(i) | Mark ST(i) as being empty and pop FPU stack. | 286,FPU,UNDOC |
| FIADD | DE /0 | m16 | Add integer word to ST(0). | 86,FPU |
| FIADD | DA /0 | m32 | Add integer DW to ST(0). | 86,FPU |
| FICOM | DE /2 | m16 | Compare ST(0) with word. | 86,FPU |
| FICOM | DA /2 | m32 | Compare ST(0) with DW. | 86,FPU |
| FICOMP | DE /3 | m16 | Compare ST(0) with word and pop FPU stack. | 86,FPU |
| FICOMP | DA /3 | m32 | Compare ST(0) with DW and pop FPU stack. | 86,FPU |
| FIDIV | DE /6 | m16 | Divide ST(0) with word. | 86,FPU |
| FIDIV | DA /6 | m32 | Divide ST(0) with DW. | 86,FPU |
| FIDIVR | DE /7 | m16 | Divide word by ST(0). | 86,FPU |
| FIDIVR | DA /7 | m32 | Divide DW by ST(0). | 86,FPU |
| FILD | DF /0 | m16 | Push word onto the FPU stack. | 86,FPU |
| FILD | DB /0 | m32 | Push DW onto the FPU stack. | 86,FPU |
| FILD | DF /5 | m64 | Push qword onto the FPU stack. | 86,FPU |
| FIMUL | DE /1 | m16 | Multiply ST(0) by word. | 86,FPU |
| FIMUL | DA /1 | m32 | Multiply ST(0) by DW. | 86,FPU |
| FINCSTP | D9 F7 | n/a | Increment FPU stack pointer. | 86,FPU |
| FINIT | 9B DB E3 | n/a | Initialize FPU and wait. | 86,FPU |
| FIST | DF /2 | m16 | Store ST(0) as word. | 86,FPU |
| FIST | DB /2 | m32 | Store ST(0) as DW. | 86,FPU |
| FISTP | DF /3 | m16 | Store ST(0) as word and pop FPU stack. | 86,FPU |
| FISTP | DB /3 | m32 | Store ST(0) as DW and pop FPU stack. | 86,FPU |
| FISTP | DF /7 | m64 | Store ST(0) as qword and pop FPU stack. | 86,FPU |
| FISTTP | DF /1 | m16 | Store ST(0) as word with truncation and pop FPU stack. | SSE3 |
| FISTTP | DB /1 | m32 | Store ST(0) as DW with truncation and pop FPU stack. | SSE3 |
| FISTTP | DD /1 | m64 | Store ST(0) as qword with truncation and pop FPU stack. | SSE3 |
| FISUB | DE /4 | m16 | Subtract word from ST(0). | 86,FPU |
| FISUB | DA /4 | m32 | Subtract DWt from ST(0). | 86,FPU |
| FISUBR | DE /5 | m16 | Subtract ST(0) from word. | 86,FPU |
| FISUBR | DA /5 | m32 | Subtract ST(0) from DW. | 86,FPU |
| FLD | D9 /0 | m32 | Push sngle-prec. float onto the FPU stack. | 86,FPU |
| FLD | DD /0 | m64 | Push dble-prec. float onto the FPU stack. | 86,FPU |
| FLD | DB /5 | m80 | Push 80-bit float onto the FPU stack. | 86,FPU |
| FLD | D9 C0+i | ST(i) | Push ST(i) onto the FPU stack. | 86,FPU |
| FLD1 | D9 E8 | n/a | Push +1.0 onto the FPU stack. | 86,FPU |
| FLDCW | D9 /5 | m16 | Load source into FPU control word. | 86,FPU |
| FLDENV | D9 /4 | mem | Load FPU environment. | 86,FPU |
| FLDL2E | D9 EA | n/a | Push log2(e) onto the FPU stack. | 86,FPU |
| FLDLG2 | D9 EC | n/a | Push log10(2) onto the FPU stack. | 86,FPU |
| FLDLN2 | D9 ED | n/a | Push ln(2) onto the FPU stack. | 86,FPU |
| FLDPI | D9 EB | n/a | Push pi onto the FPU stack. | 86,FPU |
| FLDZ | D9 EE | n/a | Push +0.0 onto the FPU stack. | 86,FPU |
| FMUL | D8 /1 | m32 | Multiply ST(0) by sngle-prec. float. | 86,FPU |
| FMUL | DC /1 | m64 | Multiply ST(0) by dble-prec. float. | 86,FPU |
| FMUL | D8 C8+i | ST(0), ST(i) | Multiply ST(0) by ST(i). | 86,FPU |
| FMUL | DC C8+i | ST(i), ST(0) | Multiply ST(i) by ST(0). | 86,FPU |
| FMULP | DE C8+i | ST(i), ST(0) | Multiply ST(i) by ST(0) and pop the FPU stack. | 86,FPU |
| FNCLEX | DB E2 | n/a | Clear FPU exception flags. | 86,FPU |
| FNDISI | DB E1 | n/a | Disable FPU interrupts. | 86,FPU |
| FNENI | DB E0 | n/a | Enable FPU interrupts. | 86,FPU |
| FNINIT | DB E3 | n/a | Initialize FPU. | 86,FPU |
| FNOP | D9 D0 | n/a | FPU no operation is performed. | 86,FPU |
| FNSAVE | DD /6 | mem | Save FPU state. | 86,FPU |
| FNSTCW | D9 /7 | m16 | Store FPU control word in memory. | 86,FPU |
| FNSTDW | D9 /7 | AX | Store device word into AX (only on i387SL Mobile). | 386,FPU,UNDOC |
| FNSTENV | D9 /6 | mem | Store FPU environment. | 86,FPU |
| FNSTSG | DF E2 | AX | Store signature word into AX (only on i387SL Mobile). | 386,FPU,UNDOC |
| FNSTSW | DF E0 | AX | Store FPU status word into AX. | 286,FPU |
| FNSTSW | DD /7 | m16 | Store FPU status word into memory. | 86,FPU |
| FPATAN | D9 F3 | n/a | Put arctan(ST(1)/ST(0)) to ST(1) and pop the FPU stack. | 86,FPU |
| FPREM | D9 F8 | n/a | Partial remainder rounded towards 0. | 86,FPU |
| FPREM1 | D9 F5 | n/a | Partial remainder rounded to the nearest integer. | 386,FPU |
| FPTAN | D9 F2 | n/a | Put tan(ST(0)) to ST(0) and push 1 onto FPU stack. | 86,FPU |
| FRICHOP | DD FC | n/a | Round ST(0) towards zero (only on Cyrix and 486s). | 486,FPU,CYRIX |
| FRINEAR | DF FC | n/a | Round ST(0) to nearest integer (only on Cyrix and 486s). | 486,FPU,CYRIX |
| FRINT2 | DB FC | n/a | Round ST(0) to integer (only on Cyrix and 486s). | 486,FPU,CYRIX |
| FRNDINT | D9 FC | n/a | Round ST(0) to an integer. | 86,FPU |
| FRSTOR | DD /4 | mem | Restore FPU state. | 86,FPU |
| FSAVE | 9B DD /6 | mem | Save FPU state and wait. | 86,FPU |
| FSCALE | D9 FD | n/a | Scale ST(0) by ST(1). | 86,FPU |
| FSETPM | DB E4 | n/a | Set protected mode (only on 286s). | 286,FPU,PRIV |
| FSIN | D9 FE | n/a | Replace ST(0) with its sine. | 386,FPU |
| FSINCOS | D9 FB | n/a | Compute the sine and cosine of ST(0). | 386,FPU |
| FSQRT | D9 FA | n/a | Replace ST(0) with its sq. root. | 86,FPU |
| FST | D9 /2 | m32 | Copy ST(0) to sngle-prec. float. | 86,FPU |
| FST | DD /2 | m64 | Copy ST(0) to dble-prec. float. | 86,FPU |
| FST | DD D0+i | ST(i) | Copy ST(0) to ST(i) | 86,FPU |
| FSTP | D9 /3 | m32 | Copy ST(0) to sngle-prec. float and pop FPU stack | 86,FPU |
| FSTP | DD /3 | m64 | Copy ST(0) to dble-prec. float and pop FPU stack | 86,FPU |
| FSTP | DB /7 | m80 | Copy ST(0) to 80-bit float and pop FPU stack | 86,FPU |
| FSTP | DD D8+i | ST(i) | Copy ST(0) to ST(i) and pop FPU stack | 86,FPU |
| FSTP1 | D9 D8+i | ST(i) | Undocumented alias to FSTP ST(i) | 86,FPU,UNDOC |
| FSTP8 | DF D0+i | ST(i) | Undocumented alias to FSTP ST(i) | 86,FPU,UNDOC |
| FSTP9 | DF D8+i | ST(i) | Undocumented alias to FSTP ST(i) | 86,FPU,UNDOC |
| FSTSW | 9B DF E0 | AX | Store FPU status word into AX and wait. | 286,FPU |
| FSTSW | 9B DD /7 | mem | Store FPU status word into memory and wait. | 86,FPU |
| FSUB | D8 /4 | m32 | Subtract sngle-prec. float from ST(0). | 86,FPU |
| FSUB | DC /4 | m64 | Subtract dble-prec. float from ST(0). | 86,FPU |
| FSUB | D8 E0+i | ST(0), ST(i) | Subtract ST(i) from ST(0). | 86,FPU |
| FSUB | DC E8+i | ST(i), ST(0) | Subtract ST(0) from ST(i). | 86,FPU |
| FSUBP | DE E8+i | ST(i), ST(0) | Subtract ST(0) from ST(i) and pop FPU stack. | 86,FPU |
| FSUBR | D8 /5 | m32 | Subtract ST(0) from sngle-prec. float. | 86,FPU |
| FSUBR | DC /5 | m64 | Subtract ST(0) from dble-prec. float. | 86,FPU |
| FSUBP | DE E9 | n/a | Subtract ST(0) from ST(1) and pop FPU stack. | 86,FPU |
| FSUBR | D8 E8+i | ST(0), ST(i) | Subtract ST(0) from ST(i). | 86,FPU |
| FSUBR | DC E0+i | ST(i), ST(0) | Subtract ST(i) from ST(0). | 86,FPU |
| FSUBRP | DE E0+i | ST(i), ST(0) | Subtract ST(i) from ST(0) and pop FPU stack. | 86,FPU |
| FSUBRP | DE E1 | n/a | Subtract ST(1) from ST(0) and pop FPU stack. | 86,FPU |
| FTST | D9 E4 | n/a | Compare ST(0) with 0.0. | 86,FPU |
| FUCOM | DD E0+i | ST(i) | Unordered compare ST(0) with ST(i). | 386,FPU |
| FUCOMI | DB E8+i | ST, ST(i) | Unordered compare ST(0) with ST(i) and set CPU flags. | P6,FPU |
| FUCOMIP | DF E8+i | ST, ST(i) | Unordered compare ST(0) with ST(i), set flags + pop stack. | P6,FPU |
| FUCOMP | DD E8+i | ST(i) | Unordered compare ST(0) with ST(i) and pop FPU stack. | 386,FPU |
| FUCOMPP | DA E9 | n/a | Unordered compare ST(0) with ST(1) + pop FPU stack twice. | 386,FPU |
| FXAM | D9 E5 | n/a | Examine classi of value in ST(0). | 86,FPU |
| FXCH | D9 C8+i | ST(i) | Exchange the contents of ST(0) and ST(i). | 86,FPU |
| FXCH4 | DD C8+i | ST(i) | Undocumented alias to FXCH ST(i). | 86,FPU,UNDOC |
| FXCH7 | DF C8+i | ST(i) | Undocumented alias to FXCH ST(i). | 86,FPU,UNDOC |
| FXRSTOR | 0F AE /mem|1 | mem | Restore FP, MMX, SSE and SSE2 state. | P6,FPU,SSE |
| FXSAVE | 0F AE /mem|0 | mem | Save FP, MMX, SSE and SSE2 state. | P6,FPU,SSE |
| FXTRACT | D9 F4 | n/a | Extract exponent and significand from ST(0). | 86,FPU |
| FYL2X | D9 F1 | n/a | Set ST(1) to ST(1) * log2(ST(0)) and pop FPU stack. | 86,FPU |
| FYL2XP1 | D9 F9 | n/a | Set ST(1) to ST(1) * log2(ST(0)+1) and pop FPU stack. | 86,FPU |
| HADDPD | 66 0F 7C /r | xmm1, xmm2/m128 | Add horizontally packed dble-prec. floats. | SSE3 |
| HADDPS | F2 0F 7C /r | xmm1, xmm2/m128 | Add horizontally packed sngle-prec. floats. | SSE3 |
| HLT | F4 | n/a | Halt the processor. | 86 |
| HSUBPD | 66 0F 7D /r | xmm1, xmm2/m128 | Subtract horizontally packed dble-prec. floats. | SSE3 |
| HSUBPS | F2 0F 7D /r | xmm1, xmm2/m128 | Subtract horizontally packed sngle-prec. floats. | SSE3 |
| IBTS | 0F A7 /r | r/m,r | Write bits from reg to r/m (only on the old 386s). | 386,UNDOC |
| ICEBP | F1 | n/a | One-byte form of INT 1. | P6,UNDOC |
| IDIV | F7 /7 | r/m | Signed divide eDX:eAX by the operand. | 86/386 |
| IDIV | F6 /7 | r/m8 | Signed divide AX by the operand. | 86 |
| IMUL | F7 /5 | r/m | Signed multiply operand by eAX. | 86/386 |
| IMUL | F6 /5 | r/m8 | Signed multiply operand by AL. | 86 |
| IMUL | 69 /r iv | r, r/m, imm | Signed multiplation of two integers. | 286 |
| IMUL | 6B /r ib | r, r/m, imm8 | Signed multiplation of two integers. | 286 |
| IMUL | 0F AF /r | r, r/m | Signed multiplation of two integers. | 286 |
| IN | EC | AL, DX | Input AL from I/O port. | 86 |
| IN | E4 ib | AL, imm8 | Input AL from I/O port. | 86 |
| IN | ED | eAX, DX | Input eAX from I/O port. | 86/386 |
| IN | E5 ib | eAX, imm8 | Input eAX from I/O port. | 86/386 |
| INC | 40 | eAX | Increment integer by 1. | 86/386 |
| INC | 45 | eBP | Increment integer by 1. | 86/386 |
| INC | 43 | eBX | Increment integer by 1. | 86/386 |
| INC | 41 | eCX | Increment integer by 1. | 86/386 |
| INC | 47 | eDI | Increment integer by 1. | 86/386 |
| INC | 42 | eDX | Increment integer by 1. | 86/386 |
| INC | 46 | eSI | Increment integer by 1. | 86/386 |
| INC | 44 | eSP | Increment integer by 1. | 86/386 |
| INC | FF /0 | r/m | Increment integer by 1. | 86/386 |
| INC | FE /0 | r/m8 | Increment r/m byte by 1 | 86 |
| INSB | 6C | n/a | Input string byte from I/O port. | 186 |
| INSW | 6D | m8, DX | Input string byte from I/O port. | 186/386 |
| INSD | 6D | m8, DX | Input string byte from I/O port. | 186/386 |
| INT | CC | 3 | One byte form of INT 3. | 86 |
| INT | CD ib | imm8 | Software interrupt. | 86 |
| INTO | CE | n/a | Interrupt 4, if OF=1. | 86 |
| INVD | 0F 08 | n/a | Invalidate CPU internal caches. | 486,PRIV |
| INVLPG | 0F 01/7 | m | Invalidate TLB entry. | 486,PRIV |
| IRET | CF | n/a | Return from Interrupt. | 86 |
| IRETD | CF | n/a | Return from Interrupt. | 86 |
| JA | 0F 87 iv | rel | Jump if above (CF=0 and ZF=0) | 86 |
| JNBE | 0F 87 iv | rel | Jump if above (CF=0 and ZF=0) | 86 |
| JA | 77 cb | rel8 | Jump short if above (CF=0 and ZF=0) | 386 |
| JNBE | 77 cb | rel8 | Jump short if above (CF=0 and ZF=0) | 386 |
| JAE | 0F 83 iv | rel | Jump if above or equal (CF=0) | 86 |
| JNB | 0F 83 iv | rel | Jump if above or equal (CF=0) | 86 |
| JNC | 0F 83 iv | rel | Jump if above or equal (CF=0) | 86 |
| JAE | 73 cb | rel8 | Jump short if above or equal (CF=0) | 386 |
| JNB | 73 cb | rel8 | Jump short if above or equal (CF=0) | 386 |
| JNC | 73 cb | rel8 | Jump short if above or equal (CF=0) | 386 |
| JB | 0F 82 cw/cd | rel | Jump if below (CF=1) | 386 |
| JC | 0F 82 cw/cd | rel | Jump if below (CF=1) | 386 |
| JNAE | 0F 82 cw/cd | rel | Jump if below (CF=1) | 386 |
| JB | 72 cb | rel8 | Jump short if below (CF=1) | 86 |
| JC | 72 cb | rel8 | Jump short if below (CF=1) | 86 |
| JNAE | 72 cb | rel8 | Jump short if below (CF=1) | 86 |
| JBE | 0F 86 cw/cd | rel | Jump if below or equal (CF=1 or ZF=1). | 386 |
| JNA | 0F 86 cw/cd | rel | Jump if below or equal (CF=1 or ZF=1). | 386 |
| JBE | 76 cb | rel8 | Jump short if below or equal (CF=1 or ZF=1). | 86 |
| JNA | 76 cb | rel8 | Jump short if below or equal (CF=1 or ZF=1). | 86 |
| JCXZ | E3 cb | rel8 | Jump short if eCX is 0. | 86/386 |
| JECXZ | E3 cb | rel8 | Jump short if eCX is 0. | 86/386 |
| JE | 0F 84 iv | rel | Jump if equal (ZF=1). | 386 |
| JZ | 0F 84 iv | rel | Jump if equal (ZF=1). | 386 |
| JE | 74 ib | rel8 | Jump short if equal (ZF=1). | 86 |
| JZ | 74 ib | rel8 | Jump short if equal (ZF=1). | 86 |
| JG | 0F 8F iv | rel | Jump if greater (ZF=0 and SF=OF) | 386 |
| JNLE | 0F 8F iv | rel | Jump if greater (ZF=0 and SF=OF) | 386 |
| JG | 7F cb | rel8 | Jump short if greater (ZF=0 and SF=OF) | 86 |
| JNLE | 7F cb | rel8 | Jump short if greater (ZF=0 and SF=OF) | 86 |
| JGE | 0F 8D iv | rel | Jump near if greater or equal (SF=OF) | 386 |
| JNL | 0F 8D iv | rel | Jump near if greater or equal (SF=OF) | 386 |
| JGE | 7D cb | rel8 | Jump short if greater or equal (SF=OF) | 86 |
| JNL | 7D cb | rel8 | Jump short if greater or equal (SF=OF) | 86 |
| JL | 0F 8C cw/cd | rel | Jump if less (SF<>OF) | 386 |
| JNGE | 0F 8C cw/cd | rel | Jump if less (SF<>OF) | 386 |
| JL | 7C cb | rel8 | Jump short if less (SF<>OF) | 86 |
| JNGE | 7C cb | rel8 | Jump short if less (SF<>OF) | 86 |
| JLE | 0F 8E cw/cd | rel | Jump if less or equal (ZF=1 or SF<>OF) | 386 |
| JNG | 0F 8E cw/cd | rel | Jump if less or equal (ZF=1 or SF<>OF) | 386 |
| JLE | 7E cb | rel8 | Jump short if less or equal (ZF=1 or SF<>OF) | 86 |
| JNG | 7E cb | rel8 | Jump short if less or equal (ZF=1 or SF<>OF) | 86 |
| JMP | EA iv iw | imm16:imm | a far absolute jump. | 86 |
| JMP | FF /5 | m16:m | a far absolute indirect jump. | 86 |
| JMP | FF /4 | r/m | A near absolute indirect jump. | 86/386 |
| JMP | E9 iv | rel | A near relative jump. | 86 |
| JMP | EB ib | rel8 | A short relative jump. | 86 |
| JMPE | 0F 00 /6 | r/m | Transition from IA-32 mode to IA-64 mode. | ITANIUM |
| JMPE | 0F B8 iv | rel | Transition from IA-32 mode to IA-64 mode. | ITANIUM |
| JNE | 0F 85 cw/cd | rel | Jump if not equal (ZF=0) | 386 |
| JNZ | 0F 85 cw/cd | rel | Jump if not equal (ZF=0) | 386 |
| JNE | 75 ib | rel8 | Jump short if not equal (ZF=0) | 86 |
| JNZ | 75 ib | rel8 | Jump short if not equal (ZF=0) | 86 |
| JNO | 0F 81 iv | rel | Jump if not overflow (OF=0) | 386 |
| JNO | 71 ib | rel8 | Jump short if not overflow (OF=0). | 86 |
| JNP | 0F 8B iv | rel | Jump if not parity (PF=0). | 386 |
| JPO | 0F 8B iv | rel | Jump if not parity (PF=0). | 386 |
| JNP | 7B ib | rel8 | Jump short if not parity (PF=0). | 86 |
| JPO | 7B ib | rel8 | Jump short if not parity (PF=0). | 86 |
| JNS | 0F 89 iv | rel | Jump if not sign (SF=0). | 386 |
| JNS | 79 ib | rel8 | Jump short if not sign (SF=0). | 86 |
| JO | 0F 80 iv | rel | Jump if overflow (OF=1). | 386 |
| JO | 70 ib | rel8 | Jump short if overflow (OF=1). | 86 |
| JP | 0F 8A iv | rel | Jump if parity (PF=1). | 386 |
| JPE | 0F 8A iv | rel | Jump if parity (PF=1). | 386 |
| JP | 7A ib | rel8 | Jump short if parity (PF=1). | 86 |
| JPE | 7A ib | rel8 | Jump short if parity (PF=1). | 86 |
| JS | 0F 88 iv | rel | Jump if sign (SF=1). | 386 |
| JS | 78 ib | rel8 | Jump short if sign (SF=1) | 86 |
| LAHF | 9F | n/a | Load AH from CPU flags. | 86 |
| LAR | 0F 02 /r | reg, r/m | Load access rights of the segment. | 286 |
| LDDQU | F2 0F F0 /r | xmm,m128 | Load unaligned dble-prec. qword. | SSE3 |
| LDMXCSR | 0F AE /mem|2 | m32 | Load source into MXCSR. | SSE |
| LDS | C5 /r | reg, m16:mem | Load far pointer into DS and register. | 86 |
| LEA | 8D /r | r32, m | Load effective address into register. | 86/386 |
| LEAVE | C9 | n/a | Destroy stack frame used by procedure or sbroutine. | 186 |
| LES | C4 /r | r1 m16:mem | Load far pointer into ES and register. | 86 |
| LFENSE | 0F AE /3|5 | n/a | Load fence. | SSE2 |
| LFS | 0F B4 /r | reg, m16:mem | Load far pointer into FS and register. | 386 |
| LGDT | 0F 01 /2 | mem | Load source into GDTR. | 286,PRIV |
| LGS | 0F B5 /r | r, m16:mem | Load far pointer into GS and register. | 386 |
| LIDT | 0F 01 /3 | mem | Load source into IDTR. | 286,PRIV |
| LLDT | 0F 00 /2 | r/m16 | Load source into LDTR. | 286,PRIV |
| LMSW | 0F 01 /6 | r/m16 | Load source into MSW (bottom 4 bits of CR(0). | 286,PRIV |
| LOADALL | 0F 07 | n/a | Load processor state (on some 386 & 486s). | 386,UNDOC |
| LOADALL286 | 0F 04 | n/a | Load processor state (only on 286). | 286,UNDOC |
| LOADALL286 | 0F 05 | n/a | Load processor state (only on 286). | 286,UNDOC |
| LOCK | F0 | n/a | Exclusive use of memory in multiprocessor system. | 86 |
| LODSB | AC | n/a | Load a byte from string. | 86 |
| LODSW | AD | n/a | Load a word from string. | 86/386 |
| LODSD | AD | n/a | Load a DW from string. | 86/386 |
| LOOP | E2 ib | rel8 | Decrement eCX and jump if eCX<>0. | 86 |
| LOOPE | E1 ib | rel8 | Decrement eCX and jump if eCX<>0 and ZF=1. | 86 |
| LOOPZ | E1 ib | rel8 | Decrement eCX and jump if eCX<>0 and ZF=1. | 86 |
| LOOPNE | E0 ib | rel8 | Decrement eCX and jump if eCX<>0 and ZF=0. | 86 |
| LOOPNZ | E0 ib | rel8 | Decrement eCX and jump if eCX<>0 and ZF=0. | 86 |
| LSL | 0F 03 /r | reg, r/m | Load segment limit. | 286 |
| LSS | 0F B2 /r | reg, m16:mem | Load far pointer into SS and register. | 386 |
| LTR | 0F 00 /3 | r/m16 | Load source into TR. | 286,PRIV |
| MASKMOVDQU | 66 0F F7 /r | xmm1, xmm2 | Store selected bytes of DW. | SSE2 |
| MASKMOVQ | 0F F7 /r | mm1, mm2 | Store selected bytes of qword. | SSE |
| MAXPD | 66 0F 5F /r | xmm1, xmm2/m128 | Maximum of packed dble-prec. floats. | SSE2 |
| MAXPS | 0F 5F /r | xmm1, xmm2/m128 | Maximum of packed sngle-prec. floats. | SSE |
| MAXSD | F2 0F 5F /r | xmm1, xmm2/m64 | Maximum of scalar dble-prec. floats. | SSE2 |
| MAXSS | F3 0F 5F /r | xmm1, xmm2/m32 | Maximum of scalar sngle-prec. floats. | SSE |
| MFENCE | 0F AE /6 | n/a | Memory fence. | SSE2 |
| MINPD | 66 0F 5D /r | xmm1, xmm2/m128 | Minimum of packed dble-prec. floats. | SSE2 |
| MINPS | 0F 5D /r | xmm1, xmm2/m128 | Minimum of packed sngle-prec. floats. | SSE |
| MINSD | F2 0F 5D /r | xmm1, xmm2/m64 | Minimum of scalar dble-prec. floats. | SSE2 |
| MINSS | F3 0F 5D /r | xmm1, xmm2/m32 | Minimum of scalar sngle-prec. floats. | SSE |
| MONITOR | 0F 01 C8 | n/a | Setup monitor address from EAX. | SSE3 |
| MOV AH | B4 ib | imm8 | Move immediate value into register. | 86 |
| MOV AL | B0 ib | imm8 | Move immediate value into register. | 86 |
| MOV AL | A0 ib | moffs8 | Move source into register. | 86 |
| MOV BH | B7 ib | imm8 | Move immediate value into register. | 86 |
| MOV BL | B3 ib | imm8 | Move immediate value into register. | 86 |
| MOV CH | B5 ib | imm8 | Move immediate value into register. | 86 |
| MOV CL | B1 ib | imm8 | Move immediate value into register. | 86 |
| MOV CR0 | 0F 22 /r | reg32 | Move register into control register. | 386/PRIV |
| MOV CR2 | 0F 22 /r | reg32 | Move register into control register. | 386/PRIV |
| MOV CR3 | 0F 22 /r | reg32 | Move register into control register. | 386/PRIV |
| MOV CR4 | 0F 22 /r | reg32 | Move register into control register. | 386/PRIV |
| MOV DH | B6 ib | imm8 | Move immediate value into register. | 86 |
| MOV DL | B2 ib | imm8 | Move immediate value into register. | 86 |
| MOV DR0 | 0F 23 /r | reg32 | Move register into debug register. | 386,PRIV |
| MOV DR1 | 0F 23 /r | reg32 | Move register into debug register. | 386,PRIV |
| MOV DR2 | 0F 23 /r | reg32 | Move register into debug register. | 386,PRIV |
| MOV DR3 | 0F 23 /r | reg32 | Move register into debug register. | 386,PRIV |
| MOV DR6 | 0F 23 /r | reg32 | Move register into debug register. | 386,PRIV |
| MOV DR7 | 0F 23 /r | reg32 | Move register into debug register. | 386,PRIV |
| MOV eAX | B8 iv | imm | Move immediate value into register. | 86,386 |
| MOV eAX | A1 iv | moffs | Move source into register. | 86,386 |
| MOV eBP | BD iv | imm | Move immediate value into register. | 86,386 |
| MOV eBX | BB iv | imm | Move immediate value into register. | 86,386 |
| MOV eCX | B9 iv | imm | Move immediate value into register. | 86,386 |
| MOV eDI | BF iv | imm | Move immediate value into register. | 86,386 |
| MOV eDX | BA iv | imm | Move immediate value into register. | 86,386 |
| MOV eSI | BE iv | imm | Move immediate value into register. | 86,386 |
| MOV eSP | BC iv | imm | Move immediate value into register. | 86,386 |
| MOV | A3 iv | moffs,eAX | Move register into destination. | 86,386 |
| MOV | A2 ib | moffs8,AL | Move register into destination. | 86 |
| MOV | C7 /0 iv | r/m,imm | Move immediate value into register. | 86 |
| MOV | 89 /r | r/m,reg | Move register into destination. | 86/386 |
| MOV | 8C /r | r/m, sreg | Move segment register into destination. | 86 |
| MOV | C6 /0 ib | r/m8,imm8 | Move immediate value into destination. | 86 |
| MOV | 88 /r | r/m8,reg8 | Move register into destination. | 86 |
| MOV | 8B /r | reg,r/m | Move source into register. | 86,386 |
| MOV | 0F 20 /r | reg32,CR0/2/3/4 | Move control register into register. | 386 |
| MOV | 0F 21 /r | reg32,DR0/1/2/3/6/7 | Move debug register into register. | 386 |
| MOV | 0F 24 /r | reg32,TR3/4/5/6/7 | Move test register into register. | 386 |
| MOV | 8A /r | reg8,r/m8 | Move source into register. | 86 |
| MOV | 8E /r | sreg,r/m | Move source into segment register. | 86 |
| MOV | 0F 26 /r | TR3/4/5/6/7,reg32 | Move register into test register. | 386 |
| MOVAPD | 66 0F 28 /r | xmm1, xmm2/m128 | Move aligned packed dble-prec. floats. | SSE2 |
| MOVAPD | 66 0F 29 /r | xmm2/m128, xmm1 | Move aligned packed dble-prec. floats. | SSE2 |
| MOVAPS | 0F 28 /r | xmm1,xmm2/m128 | Move aligned packed sngle-prec. floats. | SSE |
| MOVAPS | 0F 29 /r | xmm1/m128,xmm2 | Move aligned packed sngle-prec. floats. | SSE |
| MOVD | 0F 6E /r | mm,r/m32 | Move DW to MMX register. | MMX |
| MOVD | 0F 7E /r | r/m32, mm | Move DW from MMX register. | MMX |
| MOVD | 66 0F 7E /r | r/m32,xmm | Move DW to XMM register. | SSE2 |
| MOVD | 66 0F 6E /r | xmm,r/m32 | Move DW from XMM register. | SSE2 |
| MOVDDUP | F2 0F 12 /r | xmm1,xmm2/m128 | Move packed dble-prec. float and duplicate it. | SSE3 |
| MOVDQ2Q | F2 0F D6 /r | mm,xmm | Move DW from XMM to MMX register. | SSE2 |
| MOVDQA | 66 0F 6F /r | xmm1,xmm2/m128 | Move aligned double qword. | SSE2 |
| MOVDQA | 66 0F 7F /r | xmm2/m128,xmm1 | Move aligned double qword. | SSE2 |
| MOVDQU | F3 0F 6F /r | xmm1,xmm2/m128 | Move unaligned double qword. | SSE2 |
| MOVDQU | F3 0F 7F /r | xmm1,m128/xmm2 | Move unaligned double qword. | SSE2 |
| MOVHLPS | OF 12 3| /r | xmm1,xmm2 | Move packed sngle-prec. floats values from high to low. | SSE |
| MOVHPD | 66 0F 17 /r | m64,xmm | Move high packed dble-prec. floats. | SSE2 |
| MOVHPD | 66 0F 16 /r | xmm,m64 | Move high packed dble-prec. floats. | SSE2 |
| MOVHPS | 0F 17 /r | m64,xmm | Move high packed sngle-prec. floats. | SSE |
| MOVHPS | 0F 16 /mem|r | xmm, m64 | Move high packed sngle-prec. floats. | SSE |
| MOVLHPS | OF 16 3| /r | xmm1,xmm2 | Move packed sngle-prec. floats from low to high. | SSE |
| MOVLPD | 66 0F 13 /r | m64,xmm | Move low packed dble-prec. floats. | SSE2 |
| MOVLPD | 66 0F 12 /r | xmm,m64 | Move low packed dble-prec. floats. | SSE2 |
| MOVLPS | 0F 13 /r | m64,xmm | Move low packed dble-prec. floats. | SSE |
| MOVLPS | 0F 12 /mem|r | xmm,m64 | Move low packed sngle-prec. floats. | SSE |
| MOVMSKPD | 66 0F 50 /r | reg32,xmm | Extract packed dble-prec. float sign mask. | SSE2 |
| MOVMSKPS | 0F 50 /r | reg32,xmm | Extract packed sngle-prec. float sign mask. | SSE |
| MOVNTDQ | 66 0F E7 /r | m128,xmm | Move dble-prec. qword preventing caching. | SSE2 |
| MOVNTI | 0F C3 /r | m32,reg32 | Move DW preventing caching. | SSE2 |
| MOVNTPD | 66 0F 2B /r | m128,xmm | Move packed dble-prec. float preventing caching. | SSE2 |
| MOVNTPS | 0F 2B /r | m128,xmm | Move packed sngle-prec. float preventing caching. | SSE |
| MOVNTQ | 0F E7 /r | m64,mm | Move qword preventing caching. | SSE |
| MOVQ | 0F 6F /r | mm1,mm2/m64 | Move qword to MMX register. | MMX |
| MOVQ | 0F 7F /r | mm1/m64,mm2 | Move qword from MMX register. | MMX |
| MOVQ | F3 0F 7E /r | xmm1,xmm2/m64 | Move qword to XMM register. | SSE2 |
| MOVQ | 66 0F D6 /r | xmm2/m64,xmm1 | Move qword from XMM register. | SSE2 |
| MOVQ2DQ | F3 0F D6 /r | xmm,mm | Move qword from MMX to XMM register. | SSE2 |
| MOVSB | A4 | n/a | Move abyte from string to string. | 86 |
| MOVSD | F2 0F 10 /r | xmm1,xmm2/m64 | Move scalar dble-prec. float. | SSE2 |
| MOVSD | F2 0F 11 /r | xmm2/m64,xmm1 | Move scalar dble-prec. float. | SSE2 |
| MOVSHDUP | F3 0F 16 /r | xmm1,xmm2/m128 | Move high packed sngle-prec. floats and duplicate them. | SSE3 |
| MOVSLDUP | F3 0F 12 /r | xmm2/m128,xmm1 | Move low packed sngle-prec. floats and duplicate them. | SSE3 |
| MOVSS | F3 0F 10 /r | xmm1,xmm2/m64 | Move scalar dble-prec. float. | SSE |
| MOVSS | F3 0F 11 /r | xmm2/m64,xmm1 | Move scalar dble-prec. float. | SSE |
| MOVSW | A5 | n/a | Move word from string to string. | 86/386 |
| MOVSD | A5 | n/a | Move DW from string to string. | 86/386 |
| MOVSX | 0F BE /r | reg,r/m8 | Move byte to word with sign-extension. | 386 |
| MOVSX | 0F BF /r | reg32,r/m16 | Move word to doubleword, sign-extension. | 386 |
| MOVUPD | 66 0F 10 /r | xmm1, xmm2/m128 | Move unaligned packed dble-prec. floats. | SSE2 |
| MOVUPD | 66 0F 11 /r | xmm2/m128, xmm | Move unaligned packed dble-prec. floats. | SSE2 |
| MOVUPS | 0F 10 /r | xmm1,xmm2/m128 | Move unaligned packed sngle-prec. floats. | SSE |
| MOVUPS | 0F 11 /r | xmm2/m128,xmm1 | Move unaligned packed sngle-prec. floats. | SSE |
| MOVZX | 0F B6 /r | reg,r/m8 | Move byte to word with zero-extension. | 386 |
| MOVZX | 0F B7 /r | reg32,r/m16 | Move word to doubleword with zero-extension. | 386 |
| MUL | F7 /4 | r/m | Unsigned multiply operand by eAX. | 86/386 |
| MUL | F6 /4 | r/m8 | Unsigned multiply operand by AL. | 86 |
| MULPD | 66 0F 59 /r | xmm1,xmm2/m128 | Multiply packed dble-prec. floats. | SSE2 |
| MULPS | 0F 59 /r | xmm1,xmm2/m128 | Multiply packed sngle-prec. floats. | SSE |
| MULSD | F2 0F 59 /r | xmm1,xmm2/m64 | Multiply scalar dble-prec. floats. | SSE2 |
| MULSS | F3 0F 59 /r | xmm1,xmm2/m32 | Multiply scalar dble-prec. floats. | SSE |
| MWAIT | 0F 01 C9 | n/a | Monitor wait hint. | SSE3 |
| NEG | F7 /3 | r/m | Two’s complement negation. | 86/386 |
| NEG | F6 /3 | r/m8 | Two’s complement negation. | 86 |
| NOP | 90 | n/a | No operation | 86 |
| NOT | F7 /2 | r/m | Ones’s complement negation. | 86/386 |
| NOT | F6 /2 | r/m8 | Ones’s complement negation. | 86 |
| OR | 0C ib | AL,imm8 | Bitwise OR of two integers. | 86 |
| OR | 0D iv | eAX,imm | Bitwise OR of two integers. | 86/386 |
| OR | 81 /1 iv | r/m,imm | Bitwise OR of two integers. | 86/386 |
| OR | 83 /1 ib | r/m,imm8 | Bitwise OR of two integers. | 86/386 |
| OR | 09 /r | r/m,reg | Bitwise OR of two integers. | 86/386 |
| OR | 80 /1 ib | r/m8,imm8 | Bitwise OR of two integers. | 86 |
| OR | 82 /1 ib | r/m8,imm8 | Bitwise OR of two integers. | 86 |
| OR | 08 /r | r/m8,reg8 | Bitwise OR of two integers. | 86 |
| OR | 0B /r | reg,r/m | Bitwise OR of two integers. | 86/386 |
| OR | 0A /r | reg8,r/m8 | Bitwise OR of two integers. | 86 |
| ORPD | 66 0F 56 /r | xmm1, xmm2/m128 | Bitwise OR of packed dble-prec. floats. | SSE2 |
| ORPS | 0F 56 /r | xmm1,xmm2/m128 | Bitwise OR of packed sngle-prec. floats. | SSE |
| OUT | EE | DX,AL | Output AL to I/O port. | 86 |
| OUT | EF | DX,eAX | Output eAX to I/O port. | 86,386 |
| OUT | E6 ib | imm8,AL | Output AL to I/O port. | 86 |
| OUT | E7 ib | imm8,eAX | Output eAX to I/O port. | 86/386 |
| OUTSB | 6E | n/a | Output string byte to I/O port. | 186 |
| OUTSW | 6F | n/a | Output string word to I/O port. | 186/386 |
| OUTSD | 6F | n/a | Output string DW to I/O port. | 186/386 |
| PACKSSDW | 0F 6B /r | mm1,mm2/m64 | Pack DWs to words with signed saturation. | MMX |
| PACKSSDW | 66 0F 6B /r | xmm1,xmm2/m128 | Pack DWs to words with signed saturation. | SSE2 |
| PACKSSWB | 0F 63 /r | mm1,mm2/m64 | Pack words to bytes with signed saturation. | MMX |
| PACKSSWB | 66 0F 63 /r | xmm1,xmm2/m128 | Pack words to bytes with signed saturation. | SSE2 |
| PACKUSWB | 0F 67 /r | mm1,mm2/m64 | Pack words to bytes with unsigned saturation. | MMX |
| PACKUSWB | 66 0F 67 /r | xmm1,xmm2/m128 | Pack words to bytes with unsigned saturation. | SSE2 |
| PADDB | 0F FC /r | mm1,mm2/m64 | Add packed byte integers. | MMX |
| PADDB | 66 0F FC /r | xmm1,xmm2/m128 | Add packed byte integers. | SSE2 |
| PADDD | 0F FE /r | mm1,mm2/m64 | Add packed DW integers. | MMX |
| PADDD | 66 0F FE /r | xmm1,xmm2/m128 | Add packed DW integers. | SSE2 |
| PADDQ | 0F D4 /r | mm1,mm2/m64 | Add packed qword integers. | MMX |
| PADDQ | 66 0F D4 /r | xmm1,xmm2/m128 | Add packed qword integers. | SSE2 |
| PADDSB | 0F EC /r | mm1,mm2/m64 | Add packed byte integers with signed saturation. | MMX |
| PADDSB | 66 0F EC /r | xmm1,xmm2/m128 | Add packed byte integers with signed saturation. | SSE2 |
| PADDSIW | 0F 51 /r | mm,r/m64 | Add packed words and store to implicit register. | MMX,CYRYX |
| PADDSW | 0F ED /r | mm1,mm2/m64 | Add packed word integers with signed saturation. | MMX |
| PADDSW | 66 0F ED /r | xmm1,xmm2/m128 | Add packed word integers with signed saturation. | SSE2 |
| PADDUSB | 0F DC /r | mm1,mm2/m64 | Add packed byte integers with unsigned saturation. | MMX |
| PADDUSB | 66 0F DC /r | xmm1,xmm2/m128 | Add packed byte integers with unsigned saturation. | SSE2 |
| PADDUSW | 0F DD /r | mm1,mm2/m64 | Add packed word integers with unsigned saturation. | MMX |
| PADDUSW | 66 0F DD /r | xmm1,xmm2/m128 | Add packed word integers with unsigned saturation. | SSE2 |
| PADDW | 0F FD /r | mm1,mm2/m64 | Add packed word integers. | MMX |
| PADDW | 66 0F FD /r | xmm1,xmm2/m128 | Add packed word integers. | SSE2 |
| PAND | 0F DB /r | mm1,mm2/m64 | Bitwise AND of MMX register. | MMX |
| PAND | 66 0F DB /r | xmm1,xmm2/m128 | Bitwise AND of XMM register. | SSE2 |
| PANDN | 0F DF /r | mm1,mm2/m64 | Bitwise AND NOT of MMX register. | MMX |
| PANDN | 66 0F DF /r | xmm1,xmm2/m128 | Bitwise AND NOT of XMM register. | SSE2 |
| PAUSE | F3 90 | n/a | Hint to processor that improves performance of spin loops. | SSE2 |
| PAVEB | 0F 50 /r | mm, r/m64 | Average of 8 packed bytes. | MMX,CYRIX |
| PAVGB | 0F E0 /r | mm1,mm2/m64 | Average of packed byte integers. | SSE |
| PAVGB | 66 0F E0 /r | xmm1,xmm2/m128 | Average of packed byte integers. | SSE2 |
| PAVGUSB | 0F 0F /r BF | mm1,mm2/m64 | Average of unsigned packed bytes. | 3DNOW |
| PAVGW | 0F E3 /r | mm1,mm2/m64 | Average of packed word integers. | SSE |
| PAVGW | 66 0F E3 /r | xmm1,xmm2/m128 | Average of packed word integers. | SSE2 |
| PCMPEQB | 0F 74 /r | mm1,mm2/m64 | Compare packed bytes for equality. | MMX |
| PCMPEQB | 66 0F 74 /r | xmm1,xmm2/m128 | Compare packed bytes for equality. | SSE2 |
| PCMPEQD | 0F 76 /r | mm1,mm2/m64 | Compare packed DWs for equality. | MMX |
| PCMPEQD | 66 0F 76 /r | xmm1,xmm2/m128 | Compare packed DWs for equality. | SSE2 |
| PCMPEQW | 0F 75 /r | mm1,mm2/m64 | Compare packed words for equality. | MMX |
| PCMPEQW | 66 0F 75 /r | xmm1,xmm2/m128 | Compare packed words for equality. | SSE2 |
| PCMPGTB | 0F 64 /r | mm1,mm2/m64 | Compare packed bytes for greater-than. | MMX |
| PCMPGTB | 66 0F 64 /r | xmm1, xmm2/m128 | Compare packed bytes for greater-than. | SSE2 |
| PCMPGTD | 0F 66 /r | mm1,mm2/m64 | Compare packed DWs for greater-than. | MMX |
| PCMPGTD | 66 0F 66 /r | xmm1,xmm2/m128 | Compare packed DWs for greater-than. | SSE2 |
| PCMPGTW | 0F 65 /r | mm1,mm2/m64 | Compare packed words for greater-than. | MMX |
| PCMPGTW | 66 0F 65 /r | xmm1,xmm2/m128 | Compare packed words for greater-than. | SSE2 |
| PDISTIB | 0F 54 /r | mm,m64 | Packed distance and accumulate with implied register. | MMX,CYRIX |
| PEXTRW | 0F C5 /r ib | reg32,mm,imm8 | Extract the word from MMX register. | SSE |
| PEXTRW | 66 0F C5 /r ib | reg32,xmm,imm8 | Extract the word from XMM register. | SSE2 |
| PF2ID | 0F 0F /r 1D | mm1,mm2/m64 | Convert packed sngle-prec. floats to DWs. | 3DNOW |
| PF2IW | 0F 0F /r 1C | mm1,mm2/m64 | Convert packed sngle-prec. floats to words. | 3DNOW |
| PFACC | 0F 0F /r AE | mm1,mm2/m64 | Accumulate packed sngle-prec. floats. | 3DNOW |
| PFADD | 0F 0F /r 9E | mm1,mm2/m64 | Add packed sngle-prec. floats. | 3DNOW |
| PFCMPEQ | 0F 0F /r B0 | mm1,mm2/m64 | Compare packed sngle-prec. floats for equality. | 3DNOW |
| PFCMPGE | 0F 0F /r 90 | mm1,mm2/m64 | Compare packed sngle-prec. floats for greater-than/equal. | 3DNOW |
| PFCMPGT | 0F 0F /r A0 | mm1,mm2/m64 | Compare packed sngle-prec. floats for greater-than. | 3DNOW |
| PFMAX | 0F 0F /r A4 | mm1,mm2/m64 | Maximum of packed sngle-prec. floats. | 3DNOW |
| PFMIN | 0F 0F /r 94 | mm1,mm2/m64 | Minimum of packed sngle-prec. floats. | 3DNOW |
| PFMUL | 0F 0F /r B4 | mm1,mm2/m64 | Multiply packed sngle-prec. floats. | 3DNOW |
| PFNACC | 0F 0F /r 8A | mm1,mm2/m64 | Negative accumulate packed sngle-prec. floats. | 3DNOW |
| PFPNACC | 0F 0F /r 8E | mm1,mm2/m64 | Mixed accumulate packed sngle-prec. floats. | 3DNOW |
| PFRCP | 0F 0F /r 96 | mm1,mm2/m64 | Reciprocal approximation of packed sngle-prec. floats. | 3DNOW |
| PFRCPIT1 | 0F 0F /r A6 | mm1,mm2/m64 | Reciprocal of packed sngle-prec. float, 1st step. | 3DNOW |
| PFRCPIT2 | 0F 0F /r B6 | mm1,mm2/m64 | Reciprocal of packed sngle-prec. float, 2nd step. | 3DNOW |
| PFRSQIT1 | 0F 0F /r A7 | mm1,mm2/m64 | Reciprocal of packed sngle-prec. float sq. root, step 1. | 3DNOW |
| PFRSQRT | 0F 0F /r 97 | mm1,mm2/m64 | Reciprocal of packed sngle-prec. float sq. root. | 3DNOW |
| PFSUB | 0F 0F /r 9A | mm1,mm2/m64 | Subtract packed sngle-prec. floats. | 3DNOW |
| PFSUBR | 0F 0F /r AA | mm1,mm2/m64 | Reverse subtract packed sngle-prec. floats. | 3DNOW |
| PI2FD | 0F 0F /r 0D | mm1,mm2/m64 | Converts DWs to packed sngle-prec. floats. | 3DNOW |
| PI2FD | 0F 0F /r 0C | mm1,mm2/m64 | Converts words to packed sngle-prec. floats. | 3DNOW |
| PINSRW | 0F C4 /r ib | mm,reg32/m16,imm8 | Insert word into MMX register. | SSE |
| PINSRW | 66 0F C4 /r ib | xmm,reg32/m16,imm8 | Insert word into XMM register. | SSE2 |
| PMACHRIW | 0F 5E /r | mm,m64 | Packed multiply and accumulate with rounding. | MMX,CYRIX |
| PMADDWD | 0F F5 /r | mm1,mm2/m64 | Multiply and add packed integers. | MMX |
| PMADDWD | 66 0F F5 /r | xmm1,xmm2/m128 | Multiply and add packed integers. | SSE2 |
| PMAGW | 0F 52 /r | mm1,mm2/m64 | Packed magnitude of 4 words. | MMX,CYRIX |
| PMAXSW | 0F EE /r | mm1,mm2/m64 | Maximum of packed signed word integers. | SSE |
| PMAXSW | 66 0F EE /r | xmm1,xmm2/m128 | Maximum of packed signed word integers. | SSE2 |
| PMAXUB | 0F DE /r | mm1,mm2/m64 | Maximum of packed unsigned byte integers. | SSE |
| PMAXUB | 66 0F DE /r | xmm1,xmm2/m128 | Maximum of packed unsigned byte integers. | SSE2 |
| PMINSW | 0F EA /r | mm1,mm2/m64 | Minimum of packed signed word integers. | SSE |
| PMINSW | 66 0F EA /r | xmm1,xmm2/m128 | Minimum of packed signed word integers. | SSE2 |
| PMINUB | 0F DA /r | mm1,mm2/m64 | Minimum of packed unsigned byte integers. | SSE |
| PMINUB | 66 0F DA /r | xmm1,xmm2/m128 | Minimum of packed unsigned byte integers. | SSE2 |
| PMOVMSKB | 0F D7 /r | reg32,mm | Move byte mask to register. | SSE |
| PMOVMSKB | 66 0F D7 /r | reg32,xmm | Move byte mask to register. | SSE2 |
| PMULHRIW | 0F 5D /r | mm1,mm2/m64 | Multiply packed words and round to implicit register. | MMX,CYRIX |
| PMULHRW | 0F 0F /r B7 | mm1,mm2/m64 | Multiply packed words, round and store high word. | 3DNOW |
| PMULHRWC | 0F 59 /r | mm1,mm2/m64 | Multiply packed words, round and store high word. | MMX,CYRIX |
| PMULHUW | 0F E4 /r | mm1,mm2/m64 | Multiply packed unsigned words and store high word. | SSE |
| PMULHUW | 66 0F E4 /r | xmm1,xmm2/m128 | Multiply packed unsigned words and store high word. | SSE2 |
| PMULHW | 0F E5 /r | mm1,mm2/m64 | Multiply packed signed words and store high word. | MMX |
| PMULHW | 66 0F E5 /r | xmm1,xmm2/m128 | Multiply packed signed words and store high word. | SSE2 |
| PMULLW | 0F D5 /r | mm1,mm2/m64 | Multiply packed signed words and store low word. | MMX |
| PMULLW | 66 0F D5 /r | xmm1,xmm2/m128 | Multiply packed signed words and store low word. | SSE2 |
| PMULUDQ | 0F F4 /r | mm1,mm2/m64 | Multiply packed unsigned DWs. | SSE2 |
| PMULUDQ | 66 OF F4 /r | xmm1,xmm2/m128 | Multiply packed unsigned DWs. | SSE2 |
| PMVGEZB | 0F 5B /r | mm,m64 | Packed move if greater-than-or-equal. | MMX,CYRIX |
| PMVLZB | 0F 5A /r | mm,m64 | Packed move if less-than. | MMX,CYRIX |
| PMVZB | 0F 58 /r | mm,m64 | Packed move if not-equal. | MMX,CYRIX |
| POP | 0F | CS | Pop data to CS (only on some 8086s). | 86,UNDOC |
| POP | 1F | DS | Pop data to DS. | 86 |
| POP | 58 | eAX | Pop data to register. | 86/386 |
| POP | 5D | eBP | Pop data to register. | 86/386 |
| POP | 5B | eBX | Pop data to register. | 86/386 |
| POP | 59 | eCX | Pop data to register. | 86/386 |
| POP | 5F | eDI | Pop data to register. | 86/386 |
| POP | 5A | eDX | Pop data to register. | 86/386 |
| POP | 07 | ES | Pop data to ES. | 86 |
| POP | 5E | eSI | Pop data to register. | 86/386 |
| POP | 5C | eSP | Pop data to register. | 86/386 |
| POP | 0F A1 | FS | Pop data to FS. | 386 |
| POP | 0F A9 | GS | Pop data to GS. | 386 |
| POP | 8F /0 | r/m | Pop data to destination. | 86,386 |
| POP | 17 | SS | Pop data to SS. | SS |
| POPA | 61 | n/a | Pop all General-purpose registers. | 186/386 |
| POPAD | 61 | n/a | Pop all General-purpose registers. | 186/386 |
| POPF | 9D | n/a | Pop CPU flags. | 186/386 |
| POPFD | 9D | n/a | Pop CPU flags. | 186/386 |
| POR | 0F EB /r | mm1,mm2/m64 | Bitwise OR of MMX register. | MMX |
| POR | 66 0F EB /r | xmm1,xmm2/m128 | Bitwise OR of XMM register. | SSE2 |
| PREFETCH | 0F 0D /0 | m8 | Prefetch data into caches. | 3DNOW |
| PREFETCHNTA | 0F 18 /mem|0 | m8 | Prefetch non-temporal data into caches. | SSE,ATHLON |
| PREFETCHT0 | 0F 18 /mem|1 | m8 | Prefetch temporal data into caches. | SSE,ATHLON |
| PREFETCHT1 | 0F 18 /mem|2 | m8 | Prefetch temporal data into 1st level cache. | SSE,ATHLON |
| PREFETCHT2 | 0F 18 /mem|3 | m8 | Prefetch temporal data into 1st level cache. | SSE,ATHLON |
| PREFETCHW | 0F 0D /1 | m8 | Prefetch data into caches. | 3DNOW |
| PSADBW | 0F F6 /r | mm1,mm2/m64 | Compute sum of absolute differences. | SSE2 |
| PSADBW | 66 0F F6 /r | xmm1,xmm2/m128 | Compute sum of absolute differences. | SSE2 |
| PSHUFD | 66 0F 70 /r ib | xmm1,xmm2/m128,imm8 | Shuffle packed DWs. | SSE2 |
| PSHUFHW | F3 0F 70 /r ib | xmm1,xmm2/m128,imm8 | Shuffle packed high words. | SSE2 |
| PSHUFLW | F2 0F 70 /r ib | xmm1,xmm2/m128,imm8 | Shuffle packed low words. | SSE2 |
| PSHUFW | 0F 70 /r ib | mm1,mm2/m64,imm8 | Shuffle packed words. | SSE |
| PSLLD | 0F 72 /3|6 ib | mm,imm8 | Left logical shift of packed DWs. | MMX |
| PSLLD | 0F F2 /r | mm1,mm2/m64 | Left logical shift of packed DWs. | MMX |
| PSLLD | 66 0F 72 /3|6 ib | xmm,imm8 | Left logical shift of packed DWs. | SSE2 |
| PSLLD | 66 0F F2 /r | xmm1,xmm2/m128 | Left logical shift of packed DWs. | SSE2 |
| PSLLDQ | 66 0F 73 /3|7 ib | xmm1,imm8 | Left logical shift of double qwords. | SSE2 |
| PSLLQ | 0F 73 /3|6 ib | mm,imm8 | Left logical shift of packed qwords. | MMX |
| PSLLQ | 0F F3 /r | mm1,mm2/m64 | Left logical shift of packed qwords. | MMX |
| PSLLQ | 66 0F 73 /3|6 ib | xmm,imm8 | Left logical shift of packed qwords. | SSE2 |
| PSLLQ | 66 0F F3 /r | xmm1,xmm2/m128 | Left logical shift of packed qwords. | SSE2 |
| PSLLW | 0F 71 /3|6 ib | mm,imm8 | Left logical shift of packed words. | MMX |
| PSLLW | 0F F1 /r | mm1,mm2/m64 | Left logical shift of packed words. | MMX |
| PSLLW | 66 0F 71 /3|6 ib | xmm,imm8 | Left logical shift of packed words. | SSE2 |
| PSLLW | 66 0F F1 /r | xmm1,xmm2/m128 | Left logical shift of packed words. | SSE2 |
| PSRAD | 0F 72 /3|4 ib | mm,imm8 | Right arithmetic shift of packed DWs. | MMX |
| PSRAD | 0F E2 /r | mm1,mm2/m64 | Right arithmetic shift of packed DWs. | MMX |
| PSRAD | 66 0F 72 /3|4 ib | xmm,imm8 | Right arithmetic shift of packed DWs. | SSE2 |
| PSRAD | 66 0F E2 /r | xmm1, xmm2/m128 | Right arithmetic shift of packed DWs. | SSE2 |
| PSRAW | 0F 71 /4 ib | mm,imm8 | Right arithmetic shift of packed words. | MMX |
| PSRAW | 0F E1 /r | mm1,mm2/m64 | Right arithmetic shift of packed words. | MMX |
| PSRAW | 66 0F 71 /4 ib | xmm,imm8 | Right arithmetic shift of packed words. | SSE2 |
| PSRAW | 66 0F E1 /r | xmm1,xmm2/m128 | Right arithmetic shift of packed words. | SSE2 |
| PSRLD | 0F 72 /3|2 ib | mm,imm8 | Right logical shift of packed DWs. | MMX |
| PSRLD | 0F D2 /r | mm1,mm2/m64 | Right logical shift of packed DWs. | MMX |
| PSRLD | 66 0F 72 /3|2 ib | xmm,imm8 | Right logical shift of packed DWs. | SSE2 |
| PSRLD | 66 0F D2 /r | xmm1,xmm2/m128 | Right logical shift of packed DWs. | SSE2 |
| PSRLDQ | 66 0F 73 /3|3 ib | xmm,imm8 | Right logical shift of double qword. | SSE2 |
| PSRLQ | 0F 73 /2 ib | mm,imm8 | Right logical shift of packed qwords. | MMX |
| PSRLQ | 0F D3 /r | mm1,mm2/m64 | Right logical shift of packed qwords. | MMX |
| PSRLQ | 66 0F 73 /2 ib | xmm,imm8 | Right logical shift of packed qwords. | SSE2 |
| PSRLQ | 66 0F D3 /r | xmm1,xmm2/m128 | Right logical shift of packed qwords. | SSE2 |
| PSRLW | 0F 71 /3|2 ib | mm,imm8 | Right logical shift of packed words. | MMX |
| PSRLW | 0F D1 /r | mm1,mm2/m64 | Right logical shift of packed words. | MMX |
| PSRLW | 66 0F 71 /3|2 ib | xmm,imm8 | Right logical shift of packed words. | SSE2 |
| PSRLW | 66 0F D1 /r | xmm1,xmm2/m128 | Right logical shift of packed words. | SSE2 |
| PSUBB | 0F F8 /r | mm1,mm2/m64 | Subtract packed byte integers. | MMX |
| PSUBB | 66 0F F8 /r | xmm1,xmm2/m128 | Subtract packed byte integers. | SSE2 |
| PSUBD | 0F FA /r | mm1,mm2/m64 | Subtract packed DW integers. | MMX |
| PSUBD | 66 0F FA /r | xmm1,xmm2/m128 | Subtract packed DW integers. | SSE2 |
| PSUBQ | 0F FB /r | mm1,mm2/m64 | Subtract packed qword integers. | MMX |
| PSUBQ | 66 0F FB /r | xmm1,xmm2/m128 | Subtract packed qword integers. | SSE2 |
| PSUBSB | 0F E8 /r | mm1,mm2/m64 | Subtract packed signed byte integers. | MMX |
| PSUBSB | 66 0F E8 /r | xmm1,xmm2/m128 | Subtract packed signed byte integers. | SSE2 |
| PSUBSIW | 0F 55 /r | mm1,mm2/m64 | Subtract packed words and store to implicit register. | MMX,CYRIX |
| PSUBSW | 0F E9 /r | mm1,mm2/m64 | Subtract packed signed word integers. | MMX |
| PSUBSW | 66 0F E9 /r | xmm1,xmm2/m128 | Subtract packed signed word integers. | SSE2 |
| PSUBUSB | 0F D8 /r | mm1,mm2/m64 | Subtract packed unsigned byte integers. | MMX |
| PSUBUSB | 66 0F D8 /r | xmm1,xmm2/m128 | Subtract packed unsigned byte integers. | SSE2 |
| PSUBUSW | 0F D9 /r | mm1,mm2/m64 | Subtract packed unsigned word integers. | MMX |
| PSUBUSW | 66 0F D9 /r | xmm1,xmm2/m128 | Subtract packed unsigned word integers. | SSE2 |
| PSUBW | 0F F9 /r | mm1,mm2/m64 | Subtract packed word integers. | MMX |
| PSUBW | 66 0F F9 /r | xmm1,xmm2/m128 | Subtract packed word integers. | SSE2 |
| PSWAPW | 0F 0F /r BB | mm1,mm2/m64 | Swap packed data. | 3DNOW |
| PSWAPD | 0F 0F /r BB | mm1,mm2/m64 | Swap packed data. | 3DNOW |
| PUNPCKHBW | 0F 68 /r | mm1,mm2/m64 | Unpack and interleave high-order bytes. | MMX |
| PUNPCKHBW | 66 0F 68 /r | xmm1,xmm2/m128 | Unpack and interleave high-order bytes. | SSE2 |
| PUNPCKHDQ | 0F 6A /r | mm1,mm2/m64 | Unpack and interleave high-order DWs. | MMX |
| PUNPCKHDQ | 66 0F 6A /r | xmm1,xmm2/m128 | Unpack and interleave high-order DWs. | SSE2 |
| PUNPCKHQDQ | 66 0F 6D /r | xmm1,xmm2/m128 | Unpack and interleave high-order qwords. | SSE2 |
| PUNPCKHWD | 0F 69 /r | mm1,mm2/m64 | Unpack and interleave high-order words. | MMX |
| PUNPCKHWD | 66 0F 69 /r | xmm1,xmm2/m128 | Unpack and interleave high-order words. | SSE2 |
| PUNPCKLBW | 0F 60 /r | mm1,mm2/m32 | Unpack and interleave low-order bytes. | MMX |
| PUNPCKLBW | 66 0F 60 /r | xmm1,xmm2/m128 | Unpack and interleave low-order bytes. | SSE2 |
| PUNPCKLDQ | 0F 62 /r | mm1,mm2/m32 | Unpack and interleave low-order DWs. | MMX |
| PUNPCKLDQ | 66 0F 62 /r | xmm1,xmm2/m128 | Unpack and interleave low-order DWs. | SSE2 |
| PUNPCKLQDQ | 66 0F 6C /r | xmm1,xmm2/m128 | Unpack and interleave low-order qwords. | SSE2 |
| PUNPCKLWD | 0F 61 /r | mm1,mm2/m32 | Unpack and interleave low-order words. | MMX |
| PUNPCKLWD | 66 0F 61 /r | xmm1,xmm2/m128 | Unpack and interleave low-order words. | SSE2 |
| PUSH | 0E | CS | Push CS onto the stack. | 86 |
| PUSH | 1E | DS | Push DS onto the stack. | 86 |
| PUSH | 50 | eAX | Push register onto the stack. | 86/386 |
| PUSH | 55 | eBP | Push register onto the stack. | 86/386 |
| PUSH | 53 | eBX | Push register onto the stack. | 86/386 |
| PUSH | 51 | eCX | Push register onto the stack. | 86/386 |
| PUSH | 57 | eDI | Push register onto the stack. | 86/386 |
| PUSH | 52 | eDX | Push register onto the stack. | 86/386 |
| PUSH | 06 | ES | Push ES onto the stack. | 86 |
| PUSH | 56 | eSI | Push register onto the stack. | 86/386 |
| PUSH | 54 | eSP | Push register onto the stack. | 86/386 |
| PUSH | 0F A0 | FS | Push FS onto the stack. | 386 |
| PUSH | 0F A8 | GS | Push GS onto the stack. | 386 |
| PUSH | 68 | imm | Push immmediate word/DW onto the stack. | 286 |
| PUSH | 6A | imm8 | Push immmediate byte onto the stack. | 286 |
| PUSH | FF /6 | r/m | Push source onto the stack. | 86/386 |
| PUSH | 16 | SS | Push SS onto the stack. | 86 |
| PUSHA | 60 | n/a | Push all general-purpose registers. | 186/386 |
| PUSHAD | 60 | n/a | Push all general-purpose registers. | 186/386 |
| PUSHF | 9C | n/a | Push CPU flags. | 186/386 |
| PUSHFD | 9C | n/a | Push CPU flags. | 186/386 |
| PXOR | 0F EF /r | mm1,mm2/m64 | Bitwise XOR of 64-bit MMX operands. | MMX |
| PXOR | 66 0F EF /r | xmm1,xmm2/m128 | Bitwise XOR of 128-bit MMX operands. | SSE3 |
| RCL | D1 /2 | r/m,1 | Rotate left through carry bit. | 86/386 |
| RCL | D3 /2 | r/m,CL | Rotate left through carry bit. | 86/386 |
| RCL | C1 /2 ib | r/m,imm8 | Rotate left through carry bit. | 286 |
| RCL | D0 /2 | r/m8,1 | Rotate left through carry bit. | 86 |
| RCL | D2 /2 | r/m8,CL | Rotate left through carry bit. | 86 |
| RCL | C0 /2 ib | r/m8,imm8 | Rotate left through carry bit. | 286 |
| RCPPS | 0F 53 /r | xmm1,xmm2/m128 | Reciprocals of packed sngle-prec. floats. | SSE |
| RCPSS | F3 0F 53 /r | xmm1,xmm2/m32 | Reciprocal of scalar sngle-prec. floats. | SSE |
| RCR | D1 /3 | r/m,1 | Rotate right through carry bit. | 86/386 |
| RCR | D3 /3 | r/m,CL | Rotate right through carry bit. | 86/386 |
| RCR | C1 /3 ib | r/m,imm8 | Rotate right through carry bit. | 286 |
| RCR | D0 /3 | r/m8,1 | Rotate right through carry bit. | 86 |
| RCR | D2 /3 | r/m8,CL | Rotate right through carry bit. | 86 |
| RCR | C0 /3 ib | r/m8,imm8 | Rotate right through carry bit. | 286 |
| RDMSR | 0F 32 | n/a | Read Model Specific Registers. | P5,PRIV |
| RDPMC | 0F 33 | n/a | Read performance-monitoring counters. | P6 |
| RDSHR | 0F 36 /0 | r/m32 | Read SMM header pointer register. | 386,CYRIX,SMM |
| RDTSC | 0F 31 | n/a | Read time-stamp counter. | P5 |
| REP | F3 | (Prefix) | Repeat while eCX<>0 and ZF=1. | 86 |
| REPE | F3 | (Prefix) | Repeat while eCX<>0 and ZF=1. | 86 |
| REPZ | F3 | (Prefix) | Repeat while eCX<>0 and ZF=1. | 86 |
| REPNE | F2 | (Prefix) | Repeat while eCX<>0 and ZF=0. | 86 |
| REPNZ | F2 | (Prefix) | Repeat while eCX<>0 and ZF=0. | 86 |
| RET | C2 iw | imm16 | A near return from subroutine or procedure and pop data. | 86 |
| RETN | C2 iw | imm16 | A near return from subroutine or procedure and pop data. | 86 |
| RET | C3 | n/a | A near return from subroutine or procedure. | 86 |
| RETN | C3 | n/a | A near return from subroutine or procedure. | 86 |
| RETF | CB | n/a | A far return from subroutine or procedure. | 86 |
| RETF | CA iw | imm16 | A far return from subroutine or procedure. | 86 |
| ROL | D1 /0 | r/m,1 | Rotate left. | 86,386 |
| ROL | D3 /0 | r/m,CL | Rotate left. | 86,386 |
| ROL | C1 /0 ib | r/m,imm8 | Rotate left. | 286 |
| ROL | D0 /0 | r/m8,1 | Rotate left. | 86 |
| ROL | D2 /0 | r/m8,CL | Rotate left. | 86 |
| ROL | C0 /0 ib | r/m8,imm8 | Rotate left. | 286 |
| ROR | D1 /1 | r/m,1 | Rotate right. | 86,386 |
| ROR | D3 /1 | r/m,CL | Rotate right. | 86,386 |
| ROR | C1 /1 ib | r/m,imm8 | Rotate right. | 286 |
| ROR | D0 /1 | r/m8,1 | Rotate right. | 86 |
| ROR | D2 /1 | r/m8,CL | Rotate right. | 86 |
| ROR | C0 /1 ib | r/m8,imm8 | Rotate right. | 286 |
| RSDC | 0F 79 /r | sreg,m80 | Restore segment register and descriptor. | 486,CYRIX,SMM |
| RSLDT | 0F 7B /0 | m80 | Restore LDTR and descriptor. | 486,CYRIX,SMM |
| RSM | 0F AA | n/a | Resume from System Management Mode. | P5 |
| RSQRTPS | 0F 52 /r | xmm1,xmm2/m128 | Reciprocals of sq. roots of packed sngle-prec.floats. | SSE |
| RSQRTSS | F3 0F 52 /r | xmm1,xmm2/m32 | Reciprocal of sq. root of packed sngle-prec. float. | SSE |
| RSTS | 0F 7D /0 | m80 | Restore TSR and descriptor. | 486,CYRIX,SMM |
| SAHF | 9E | n/a | Store AH into CPU flags. | 86 |
| SAL | D1 /4 | r/m,1 | Left shift. | 86/386 |
| SAL | D3 /4 | r/m,CL | Left shift. | 86/386 |
| SAL | C1 /4 ib | r/m,imm8 | Left shift. | 286 |
| SAL | D0 /4 | r/m8,1 | Left shift. | 86 |
| SAL | D2 /4 | r/m8,CL | Left shift. | 86 |
| SAL | C0 /4 ib | r/m8,imm8 | Left shift. | 286 |
| SALC | D6 | n/a | Set AL from the CF (only on 8086). | 86,UNDOC |
| SAR | D1 /7 | r/m,1 | Arithmetic shift right. | 86/386 |
| SAR | D3 /7 | r/m,CL | Arithmetic shift right. | 86/386 |
| SAR | C1 /7 ib | r/m,imm8 | Arithmetic shift right. | 286 |
| SAR | D0 /7 | r/m8,1 | Arithmetic shift right. | 86 |
| SAR | D2 /7 | r/m8,CL | Arithmetic shift right. | 86 |
| SAR | C0 /7 ib | r/m8,imm8 | Arithmetic shift right. | 286 |
| SBB | 1C ib | AL,imm8 | Subtract two integers with borrow. | 86 |
| SBB | 1D iv | eAX,imm | Subtract two integers with borrow. | 86/386 |
| SBB | 81 /3 iw | r/m,imm | Subtract two integers with borrow. | 86/386 |
| SBB | 83 /3 ib | r/m,imm8 | Subtract two integers with borrow. | 86/386 |
| SBB | 19 /r | r/m,reg | Subtract two integers with borrow. | 86/386 |
| SBB | 80 /3 ib | r/m8,imm8 | Subtract two integers with borrow. | 86 |
| SBB | 82 /3 ib | r/m8,imm8 | Subtract two integers with borrow. | 86 |
| SBB | 18 /r | r/m8,reg8 | Subtract two integers with borrow. | 86 |
| SBB | 1B /r | reg32,r/m | Subtract two integers with borrow. | 86/386 |
| SBB | 1A /r | reg8,r/m8 | Subtract two integers with borrow. | 86 |
| SCASB | AE | n/a | Scan string byte. | 86 |
| SCASW | AF | n/a | Scan string word. | 86/386 |
| SCASD | AF | n/a | Scan string DW . | 86/386 |
| SETA | 0F 97 /2 | r/m8 | Set byte if above (CF=0 and ZF=0). | 386 |
| SETNBE | 0F 97 /2 | r/m8 | Set byte if above (CF=0 and ZF=0). | 386 |
| SETAE | 0F 93 /2 | r/m8 | Set byte if above or equal (CF=0). | 386 |
| SETNB | 0F 93 /2 | r/m8 | Set byte if above or equal (CF=0). | 386 |
| SETNC | 0F 93 /2 | r/m8 | Set byte if above or equal (CF=0). | 386 |
| SETB | 0F 92 /2 | r/m8 | Set byte if below (CF=1). | 386 |
| SETC | 0F 92 /2 | r/m8 | Set byte if below (CF=1). | 386 |
| SETNAE | 0F 92 /2 | r/m8 | Set byte if below (CF=1). | 386 |
| SETBE | 0F 96 /2 | r/m8 | Set byte if below or equal (CF=1 or ZF=1). | 386 |
| SETNA | 0F 96 /2 | r/m8 | Set byte if below or equal (CF=1 or ZF=1). | 386 |
| SETE | 0F 94 /2 | r/m8 | Set byte if equal (ZF=1). | 386 |
| SETZ | 0F 94 /2 | r/m8 | Set byte if equal (ZF=1). | 386 |
| SETG | 0F 9F /2 | r/m8 | Set byte if greater (ZF=0 and SF=OF). | 386 |
| SETNLE | 0F 9F /2 | r/m8 | Set byte if greater (ZF=0 and SF=OF). | 386 |
| SETGE | 0F 9D /2 | r/m8 | Set byte if greater or equal (SF=OF). | 386 |
| SETNL | 0F 9D /2 | r/m8 | Set byte if greater or equal (SF=OF). | 386 |
| SETLE | 0F 9C /2 | r/m8 | Set byte if less (SF<>OF). | 386 |
| SETNGE | 0F 9C /2 | r/m8 | Set byte if less (SF<>OF). | 386 |
| SETLE | 0F 9E /2 | r/m8 | Set byte if less or equal (ZF=1 or SF<>OF). | 386 |
| SETNG | 0F 9E /2 | r/m8 | Set byte if less or equal (ZF=1 or SF<>OF). | 386 |
| SETNE | 0F 95 /2 | r/m8 | Set byte if not equal (ZF=0). | 386 |
| SETNZ | 0F 95 /2 | r/m8 | Set byte if not equal (ZF=0). | 386 |
| SETNO | 0F 91 /2 | r/m8 | Set byte if not overflow (OF=0). | 386 |
| SETNP | 0F 9B /2 | r/m8 | Set byte if parity odd (PF=0). | 386 |
| SETPO | 0F 9B /2 | r/m8 | Set byte if parity odd (PF=0). | 386 |
| SETNS | 0F 99 /2 | r/m8 | Set byte if not sign (SF=0). | 386 |
| SETO | 0F 90 /2 | r/m8 | Set byte if overflow (OF=1). | 386 |
| SETP | 0F 9A /2 | r/m8 | Set byte if parity even (PF=1). | 386 |
| SETPE | 0F 9A /2 | r/m8 | Set byte if parity even (PF=1). | 386 |
| SETS | 0F 98 /2 | r/m8 | Set byte if sign (SF=1). | 386 |
| SFENCE | 0F AE /3|7 | n/a | Store fence. | SSE |
| SGDT | 0F 01 /0 | mem | Store GDTR into memory. | 286 |
| SHL | D1 /4 | r/m,1 | Logical left shift. | 86/386 |
| SHL | D3 /4 | r/m,CL | Logical left shift. | 86/386 |
| SHL | C1 /4 ib | r/m,imm8 | Logical left shift. | 286 |
| SHL | D0 /4 | r/m8,1 | Logical left shift. | 86 |
| SHL | D2 /4 | r/m8,CL | Logical left shift. | 86 |
| SHL | C0 /4 ib | r/m8,imm8 | Logical left shift. | 286 |
| SHLD | 0F A5 | r/m,reg,CL | Double prec. left shift. | 386 |
| SHLD | 0F A4 | r/m,reg,imm8 | Double prec. left shift. | 386 |
| SHR | D1 /5 | r/m,1 | Logical right shift. | 86/386 |
| SHR | D3 /5 | r/m,CL | Logical right shift. | 86,386 |
| SHR | C1 /5 ib | r/m,imm8 | Logical right shift. | 286 |
| SHR | D0 /5 | r/m8,1 | Logical right shift. | 86 |
| SHR | D2 /5 | r/m8,CL | Logical right shift. | 86 |
| SHR | C0 /5 ib | r/m8,imm8 | Logical right shift. | 286 |
| SHRD | 0F AD /r | r/m,reg,CL | Double prec. right shift. | 386 |
| SHRD | 0F AC /r ib | r/m,reg,imm8 | Double prec. right shift. | 386 |
| SHUFPD | 66 0F C6 /r ib | xmm1,xmm2/m128,imm8 | Shuffle packed dble-prec. floats. | SSE2 |
| SHUFPS | 0F C6 /r ib | xmm1,xmm2/m128,imm8 | Shuffle packed sngle-prec. floats. | SSE |
| SIDT | 0F 01 /1 | mem | Store IDTR into memory. | 286 |
| SLDT | 0F 00 /0 | r/m16 | Store LDTR into memory. | 286 |
| SMI | F1 | n/a | System Management Interrupt (on some AMD 386/486s). | 386,AMD,UNDOC |
| SMINT | 0F 38 | n/a | Put processor into SMM mode. | P5,CYRIX |
| SMINTOLD | 0F 7E | n/a | Put processor into SMM mode (only 486). | 486,CYRIX |
| SMSW | 0F 01 /4 | r/m16 | Store MSW (the bottom half of CR0) into memory. | 286 |
| SQRTPD | 66 0F 51 /r | xmm1,xmm2/m128 | sq. roots of packed dble-prec. floats. | SSE2 |
| SQRTPS | 0F 51 /r | xmm1,xmm2/m128 | sq. roots of packed sngle-prec. floats. | SSE |
| SQRTSD | F2 0F 51 /r | xmm1,xmm2/m64 | sq. roots of scalar dble-prec. floats. | SSE2 |
| SQRTSS | F3 0F 51 /r | xmm1,xmm2/m32 | sq. roots of scalar sngle-prec. floats. | SSE |
| STC | F9 | n/a | Set the CF flag. | 86 |
| STD | FD | n/a | Set the DF flag. | 86 |
| STI | FB | n/a | Set the IF flag (enable interrupts). | 86 |
| STMXCSR | 0F AE /mem|3 | m32 | Store MXCSR state. | SSE |
| STOSB | AA | n/a | Store byte to string. | 86 |
| STOSW | AB | n/a | Store word to string. | 86/386 |
| STOSD | AB | n/a | Store DW to string. | 86/386 |
| STR | 0F 00 /1 | r/m16 | Store TR into memory. | 286 |
| SUB | 2C ib | AL,imm8 | Subtract two integers. | 86 |
| SUB | 2D iv | eAX,imm | Subtract two integers. | 86/386 |
| SUB | 81 /5 iv | r/m,imm | Subtract two integers. | 86/386 |
| SUB | 83 /5 ib | r/m,imm8 | Subtract two integers. | 86/386 |
| SUB | 29 /r | r/m,reg | Subtract two integers. | 86/386 |
| SUB | 80 /5 ib | r/m8,imm8 | Subtract two integers. | 86 |
| SUB | 82 /5 ib | r/m8,imm8 | Subtract two integers. | 86 |
| SUB | 28 /r | r/m8,reg8 | Subtract two integers. | 86 |
| SUB | 2B /r | reg,r/m | Subtract two integers. | 86/386 |
| SUB | 2A /r | reg8,r/m8 | Subtract two integers. | 86 |
| SUBPD | 66 0F 5C /r | xmm1,xmm2/m128 | Subtract packed dble-prec. floats. | SSE2 |
| SUBPS | 0F 5C /r | xmm1,xmm2/m128 | Subtract packed sngle-prec. floats. | SSE |
| SUBSD | F2 0F 5C /r | xmm1,xmm2/m128 | Subtract scalar dble-prec. floats. | SSE2 |
| SUBSS | F3 0F 5C /r | xmm1,xmm2/m128 | Subtract scalar sngle-prec. floats. | SSE |
| SVDC | 0F 78 /r | sreg,m80 | Save segment register and descriptor. | 486,CYRIX,SMM |
| SVLDT | 0F 7A /0 | m80 | Save LDTR and descriptor. | 486,CYRIX,SMM |
| SVTS | 0F 7C /0 | m80 | Save TSR and descriptor. | 486,CYRIX,SMM |
| SYSCALL | 0F 05 | n/a | Call operating system. | P6,AMD |
| SYSENTER | 0F 34 | n/a | Fast system call. | P6 |
| SYSEXIT | 0F 35 | n/a | Fast return from fast system call. | P6,PRIV |
| SYSRET | 0F 07 | n/a | Return from operating system. | P6,AMD,PRIV |
| TEST | A8 ib | AL,imm8 | Bitwise test of two integers. | 86 |
| TEST | A9 iv | eAX,imm | Bitwise test of two integers. | 86/386 |
| TEST | F7 /0 iv | r/m,imm | Bitwise test of two integers. | 86/386 |
| TEST | 85 /r | r/m,reg | Bitwise test of two integers. | 86/386 |
| TEST | F6 /0 ib | r/m8,imm8 | Bitwise test of two integers. | 86 |
| TEST | 84 /r | r/m8,reg8 | Bitwise test of two integers. | 86 |
| UCOMISD | 66 0F 2E /r | xmm1,xmm2/m128 | Unordered compare scalar dble-prec. floats. | SSE2 |
| UCOMISS | 0F 2E /r | xmm1,xmm2/m128 | Unordered compare scalar dble-prec. floats. | SSE |
| UD0 | 0F FF | n/a | Used by AMD for an invalid opcode exception. | 186,UNDOC |
| UD1 | 0F B9 | n/a | Used by Intel for an invalid opcode exception. | 186,UNDOC |
| UD2 | 0F 0B | n/a | Undefined instruction (for invalid opcode exception). | 186 |
| UMOV | 0F 11 /r | r/m,reg | Move user data (on some AMD and IBM 386/486s). | 386,AMD,UNDOC |
| UMOV | 0F 10 /r | r/m8,reg8 | Move user data (on some AMD and IBM 386/486s). | 386,AMD,UNDOC |
| UMOV | 0F 13 /r | reg,r/m | Move user data (on some AMD and IBM 386/486s). | 386,AMD,UNDOC |
| UMOV | 0F 12 /r | reg8,r/m8 | Move user data (on some AMD and IBM 386/486s). | 386,AMD,UNDOC |
| UNPCKHPD | 66 0F 15 /r | xmm1,xmm2/m128 | Interleaved unpack of high packed dble-prec. floats. | SSE2 |
| UNPCKHPS | 0F 15 /r | xmm1,xmm2/m128 | Interleaved unpack of high packed sngle-prec. floats. | SSE |
| UNPCKLPD | 66 0F 14 /r | xmm1,xmm2/m128 | Interleaved unpack of low packed dble-prec. floats. | SSE2 |
| UNPCKLPS | 0F 14 /r | xmm1,xmm2/m128 | Interleaved unpack of low packed sngle-prec. floats. | SSE |
| VERR | 0F 00 /4 | r/m16 | Verify a segment for reading. | 286 |
| VERW | 0F 00 /5 | r/m16 | Verify a segment for writing. | 286 |
| WAIT | 9B | n/a | Wait until all pending FPU exceptions have happened. | 86 |
| FWAIT | 9B | n/a | Wait until all pending FPU exceptions have happened. | 86 |
| WBINVD | 0F 09 | n/a | Write back and invalidate cache. | 486,PRIV |
| WRMSR | 0F 30 | n/a | Write model-specific register. | P5,PRIV |
| WRSHR | 0F 37 /0 | r/m32 | Read SMM header pointer register. | 386,CYRIX,SMM |
| XADD | 0F C1 /r | r/m,reg | Exchange and add. | 486 |
| XADD | 0F C0 /r | r/m8,reg8 | Exchange and add. | 486 |
| XBTS | 0F A6 /r | reg,r/m | Write bits from r/m to reg (only on the old 386s). | 386,UNDOC |
| XCHG | 95 | eAX,eBP or reverse | Exchange contents of two registers. | 86/386 |
| XCHG | 93 | eAX,eBX or reverse | Exchange contents of two registers. | 86/386 |
| XCHG | 91 | eAX,eCX or reverse | Exchange contents of two registers. | 86/386 |
| XCHG | 97 | eAX,eDI or reverse | Exchange contents of two registers. | 86/386 |
| XCHG | 92 | eAX,eDX or reverse | Exchange contents of two registers. | 86/386 |
| XCHG | 96 | eAX,eSI or reverse | Exchange contents of two registers. | 86/386 |
| XCHG | 94 | eAX,eSP or reverse | Exchange contents of two registers. | 86/386 |
| XCHG | 87 /r | r/m,reg or reverse | Exchange contents of two operands. | 86/386 |
| XCHG | 86 /r | r/m8,reg8 or reverse | Exchange contents of two operands. | 86 |
| XLAT | D7 | n/a | Move byte from [eBX+AL] into AL. | 86 |
| XLATB | D7 | n/a | Move byte from [eBX+AL] into AL. | 86 |
| XOR | 34 ib | AL,imm8 | Bitwise XOR of two registers. | 86 |
| XOR | 35 iv | eAX,imm | Bitwise XOR of two registers. | 86,386 |
| XOR | 81 /6 iw | r/m,imm | Bitwise XOR of two registers. | 86,386 |
| XOR | 83 /6 ib | r/m,imm8 | Bitwise XOR of two registers. | 86,386 |
| XOR | 31 /r | r/m,reg | Bitwise XOR of two registers. | 86,386 |
| XOR | 80 /6 ib | r/m8,imm8 | Bitwise XOR of two registers. | 86 |
| XOR | 82 /6 ib | r/m8,imm8 | Bitwise XOR of two registers. | 86 |
| XOR | 30 /r | r/m8,reg8 | Bitwise XOR of two registers. | 86 |
| XOR | 33 /r | reg,r/m | Bitwise XOR of two registers. | 86,386 |
| XOR | 32 /r | reg8,r/m8 | Bitwise XOR of two registers. | 86 |
| XORPD | 66 0F 57 /r | xmm1,xmm2/m128 | Bitwise XOR of dble-prec. floats. | SSE2 |
| XORPS | 0F 57 /r | xmm1,xmm2/m128 | Bitwise XOR of sngle-prec. floats. | SSE |