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AMD64 Technology 24594 Rev. 3.10 February 2005Table A-1. One-Byte Opcodes, Low Nibble 0–7hNibble 1 0 1 2 3 4 5 6 70ADD PUSH POPEb, Gb Ev, Gv Gb, Eb Gv, Ev AL, Ib rAX, Iz ES 3 ES 31ADC PUSH POPEb, Gb Ev, Gv Gb, Eb Gv, Ev AL, Ib rAX, Iz SS 3 SS 32AND seg ES 6 DAA 3Eb, Gb Ev, Gv Gb, Eb Gv, Ev AL, Ib rAX, Iz3XOR seg SS 6 AAA 3Eb, Gb Ev, Gv Gb, Eb Gv, Ev AL, Ib rAX, Iz4INC 5eAX eCX eDX eBX eSP eBP eSI eDI5PUSHrAX/r8 rCX/r9 rDX/r10 rBX/r11 rSP/r12 rBP/r13 rSI/r14 rDI/r156PUSHA/D 3 POPA/D 3 BOUND 3 ARPL 3addressseg FS seg GS operand sizeGv, Ma Ew, GwsizeMOVSXD 4Gv, Ed7JO JNO JB JNB JZ JNZ JBE JNBEJb Jb Jb Jb Jb Jb Jb Jb8Group 1 2 TEST XCHGEb, Ib Ev, Iz Eb, Ib 3 Ev, Ib Eb, Gb Ev, Gv Eb, Gb Ev, GvXCHG9 r8, rAXNOPrCX/r9, rAX rDX/r10, rAX rBX/r11, rAX rSP/r12, rAX rBP/r13, rAX rSI/r14, rAX rDI/r15, rAXAMOV MOVSB MOVSW/D/Q CMPSB CMPSW/D/QAL, Ob rAX, Ov Ob, AL Ov, rAX Yb, Xb Yv, Xv Xb, Yb Xv, YvMOVBAL, Ibr8b, IbCL, Ibr9b, IbDL, Ibr10b, IbBL, Ibr11b, IbAH, Ibr12b, IbCH, Ibr13b, IbDH, Ibr14b, IbBH, Ibr15b, IbGroup 2C2 RET near LES 3 LDS 3 Group 11 2Eb, Ib Ev, Ib Iw Gz, Mp Gz, Mp Eb, Ib Ev, IzGroup 2D2 AAM 3 AAD 3 SALC 3 XLATEb, 1 Ev, 1 Eb, CL Ev, CLLOOPNE/NZ LOOPE/Z LOOP JrCXZ IN OUTEJb Jb Jb Jb AL, Ib eAX, Ib Ib, AL Ib, eAXLOCK: INT1 REPNE: REP: HLT CMC Group 3F2ICE BkptREPE:Note:1. Rows in this table show the high opcode nibble, columns show the low opcode nibble.2. An opcode extension is specified in bits 5–3 of the ModRM byte. See “ModRM Extensions to One-Byte and Two-Byte Opcodes” onpage 387 for details.3. Invalid in 64-bit mode.4. Valid only in 64-bit mode.5. Used as REX prefixes in 64-bit mode.6. This is a null prefix in 64-bit mode.378 Appendix A: Opcode and Operand Encodings
24594 Rev. 3.10 February 2005 AMD64 TechnologyTable A-2.One-Byte Opcodes, Low Nibble 8–FhNibble 1 8 9 A B C D E F0OR PUSH 2-byteEb, Gb Ev, Gv Gb, Eb Gv, Ev AL, Ib rAX, Iz CS 3 opcodes1SBB PUSH POPEb, Gb Ev, Gv Gb, Eb Gv, Ev AL, Ib rAX, Iz DS 3 DS 32SUB seg CS 6 DAS 3Eb, Gb Ev, Gv Gb, Eb Gv, Ev AL, Ib rAX, Iz3CMP seg DS 6 AAS 3Eb, Gb Ev, Gv Gb, Eb Gv, Ev AL, Ib rAX, Iz4DEC 5eAX eCX eDX eBX eSP eBP eSI eDI5POPrAX/r8 rCX/r9 rDX/r10 rBX/r11 rSP/r12 rBP/r13 rSI/r14 rDI/r156PUSH IMUL PUSH IMUL INSB INSW/D OUTSB OUTSW/DIz Gv, Ev, Iz Ib Gv, Ev, Ib Yb, DX Yz, DX DX, Xb DX, Xz7JS JNS JP JNP JL JNL JLE JNLEJb Jb Jb Jb Jb Jb Jb Jb8MOV LEA MOV Group 1a 2Eb, Gb Ev, Gv Gb, Eb Gv, Ev Mw/Rv, Sw Gv, M Sw, Ew Ev9CBW, CWDE CWD, CDQ, CALL 3 WAIT PUSHF/D/Q POPF/D/Q SAHF LAHFCDQE CQO Ap FWAIT Fv FvATEST STOSB STOSW/D/Q LODSB LODSW/D/Q SCASB SCASW/D/QAL, Ib rAX, Iz Yb, AL Yv, rAX AL, Xb rAX, Xv AL, Yb rAX, YvMOVB rAX, Ivr8, IvrCX, Ivr9, IvrDX, Ivr10, IvrBX, Ivr11, IvrSP, Ivr12, IvrBP, Ivr13, IvrSI, Ivr14, IvrDI, Ivr15, IvCENTER LEAVE RET far INT3 INT INTO 3 IRET, IRETDIw, Ib Iw Ib IRETQDx87see Table A-10 on page 394ECALL JMP IN OUTJz Jz Ap 3 Jb AL, DX eAX, DX DX, AL DX, eAXFCLC STC CLI STI CLD STD Group 4 2 Group 5 2EbNote:1. Rows in this table show the high opcode nibble, columns show the low opcode nibble.2. An opcode extension is specified in bits 5–3 of the ModRM byte. See “ModRM Extensions to One-Byte and Two-Byte Opcodes” onpage 387 for details.3. Invalid in 64-bit mode.4. Valid only in 64-bit mode.5. Used as REX prefixes in 64-bit mode.6. This is a null prefix in 64-bit mode.Appendix A: Opcode and Operand Encodings 379
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