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AMD64 Technology 24594 Rev. 3.10 February 2005Table A-6.GroupNumberGroup 1One-Byte and Two-Byte Opcode ModRM ExtensionsPrefix Opcoden/a80818283Group 1a n/a 8FGroup 2Group 3n/an/aC0C1D0D1D2D3F6F7ModRM reg Field/0 /1 /2 /3 /4 /5 /6 /7ADD OR ADC SBB AND SUB XOR CMPEb, Ib Eb, Ib Eb, Ib Eb, Ib Eb, Ib Eb, Ib Eb, Ib Eb, IbADD OR ADC SBB AND SUB XOR CMPEv, Iz Ev, Iz Ev, Iz Ev, Iz Ev, Iz Ev, Iz Ev, Iz Ev, IzADD OR ADC SBB AND SUB XOR CMPEb, Ib 2 Eb, Ib 2 Eb, Ib 2 Eb, Ib 2 Eb, Ib 2 Eb, Ib 2 Eb, Ib 2 Eb, Ib 2ADD OR ADC SBB AND SUB XOR CMPEv, Ib Ev, Ib Ev, Ib Ev, Ib Ev, Ib Ev, Ib Ev, Ib Ev, IbPOP invalid invalid invalid invalid invalid invalid invalidEvROL ROR RCL RCR SHL/SAL SHR SHL/SAL SAREb, Ib Eb, Ib Eb, Ib Eb, Ib Eb, Ib Eb, Ib Eb, Ib Eb, IbROL ROR RCL RCR SHL/SAL SHR SHL/SAL SAREv, Ib Ev, Ib Ev, Ib Ev, Ib Ev, Ib Ev, Ib Ev, Ib Ev, IbROL ROR RCL RCR SHL/SAL SHR SHL/SAL SAREb, 1 Eb, 1 Eb, 1 Eb, 1 Eb, 1 Eb, 1 Eb, 1 Eb, 1ROL ROR RCL RCR SHL/SAL SHR SHL/SAL SAREv, 1 Ev, 1 Ev, 1 Ev, 1 Ev, 1 Ev, 1 Ev, 1 Ev, 1ROL ROR RCL RCR SHL/SAL SHR SHL/SAL SAREb, CL Eb, CL Eb, CL Eb, CL Eb, CL Eb, CL Eb, CL Eb, CLROL ROR RCL RCR SHL/SAL SHR SHL/SAL SAREv, CL Ev, CL Ev, CL Ev, CL Ev, CL Ev, CL Ev, CL Ev, CLTESTEb,IbTESTEv,IzNOT NEG MUL IMUL DIV IDIVEb Eb Eb Eb Eb EbNOT NEG MUL IMUL DIV IDIVEv Ev Ev Ev Ev EvGroup 4 n/a FEINC DEC invalid invalid invalid invalid invalid invalidEb EbGroup 5 n/a FFINC DEC CALL CALL JMP JMP PUSH invalidEv Ev Ev Mp Ev Mp EvGroup 6 n/a 0F 00SLDT STR LLDT LTR VERR VERW invalid invalidMw/Rv Mw/Rv Ew Ew Ew EwGroup 7 n/a 0F 01SGDT SIDT LGDT LIDT SMSW invalid LMSW INVLPG MbMs Ms Ms Ms Mw/Rv Ew SWAPGS 1Group 8 n/a 0F BAinvalid invalid invalid invalid BT BTS BTR BTCEv, Ib Ev, Ib Ev, Ib Ev, IbNote:1. See Table A-7 on page 390 for ModRM extensions of this two-byte opcode to encode SWAPGS.2. Invalid in 64-bit mode.3. See Table A-7 on page 390 for ModRM extensions of this two-byte opcode to encode LFENCE, MFENCE, and SFENCE.4. This instruction takes a ModRM byte.5. Reserved prefetch encodings are aliased to the /0 encoding (PREFETCH Exclusive) for future compatibility.388 Appendix A: Opcode and Operand Encodings
24594 Rev. 3.10 February 2005 AMD64 TechnologyTable A-6.GroupNumberOne-Byte and Two-Byte Opcode ModRM Extensions (continued)Prefix OpcodeGroup 9 n/a 0F C7Group 10 n/a 0F B9ModRM reg Field/0 /1 /2 /3 /4 /5 /6 /7invalid CMPXCHG8B invalid invalid invalid invalid invalid invalidMqCMPXCHG16Mdqinvalid invalid invalid invalid invalid invalid invalid invalidGroup 11Group 12n/an/anone66F2, F3C6C70F 71MOV invalid invalid invalid invalid invalid invalid invalidEb,IbMOV invalid invalid invalid invalid invalid invalid invalidEv,Izinvalid invalid PSRLW invalid PSRAW invalid PSLLW invalidPRq, Ib PRq, Ib PRq, Ibinvalid invalid PSRLW invalid PSRAW invalid PSLLW invalidVRdq, Ib VRdq, Ib VRdq, Ibinvalid invalid invalid invalid invalid invalid invalid invalidGroup 13none66F2, F30F 72invalid invalid PSRLD invalid PSRAD invalid PSLLD invalidPRq, Ib PRq, Ib PRq, Ibinvalid invalid PSRLD invalid PSRAD invalid PSLLD invalidVRdq, Ib VRdq, Ib VRdq, Ibinvalid invalid invalid invalid invalid invalid invalid invalidGroup 14none66F2, F30F 73invalid invalid PSRLQ invalid invalid invalid PSLLQ invalidPRq, IbPRq, Ibinvalid invalid PSRLQ PSRLDQ invalid invalid PSLLQ PSLLDQVRdq, Ib VRdq, Ib VRdq, Ib VRdq, Ibinvalid invalid invalid invalid invalid invalid invalid invalidGroup 15none66,F2, F30F AEFXSAVE FXRSTOR LDMXCSR STMXCSR invalid LFENCE 3 MFENCE 3 SFENCE 3M M Md MdCLFLUSHMbinvalid invalid invalid invalid invalid invalid invalid invalidGroup 16 n/a. 0F 18PREFETCH PREFETCH PREFETCH PREFETCH NOP 4 NOP 4 NOP 4 NOP 4NTA T0 T1 T2Group P n/a. 0F 0DPREFETCH PREFETCH Prefetch PREFETCH Prefetch Prefetch Prefetch PrefetchExclusive Modified Reserved 5 Modified Reserved 5 Reserved 5 Reserved 5 Reserved 5Note:1. See Table A-7 on page 390 for ModRM extensions of this two-byte opcode to encode SWAPGS.2. Invalid in 64-bit mode.3. See Table A-7 on page 390 for ModRM extensions of this two-byte opcode to encode LFENCE, MFENCE, and SFENCE.4. This instruction takes a ModRM byte.5. Reserved prefetch encodings are aliased to the /0 encoding (PREFETCH Exclusive) for future compatibility.Appendix A: Opcode and Operand Encodings 389
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