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AMD64 Technology 24594 Rev. 3.10 February 2005Table A-3.Second Byte of Two-Byte Opcodes, Low Nibble 0–7h (continued)Prefix Nibble 1 0 1 2 3 4 5 6 7noneF366F2noneF366F2noneF3DEinvalid PSRLW PSRLD PSRLQ PADDQ PMULLW invalid PMOVMSKBPq, Qq Pq, Qq Pq, Qq Pq, Qq Pq, Qq Gd, PRqinvalid invalid invalid invalid invalid invalid MOVQ2DQ invalidVdq, PRqADDSUBPD PSRLW PSRLD PSRLQ PADDQ PMULLW MOVQ PMOVMSKBVpd, Wpd Vdq, Wdq Vdq, Wdq Vdq, Wdq Vdq, Wdq Vdq, Wdq Wq, Vq Gd, VRdqADDSUBPS invalid invalid invalid invalid invalid MOVDQ2Q invalidVps, WpsPq, VRqPAVGB PSRAW PSRAD PAVGW PMULHUW PMULHW invalid MOVNTQPq, Qq Pq, Qq Pq, Qq Pq, Qq Pq, Qq Pq, Qq Mq, Pqinvalid invalid invalid invalid invalid invalid CVTDQ2PD invalidVpd, WqPAVGB PSRAW PSRAD PAVGW PMULHUW PMULHW CVTTPD2DQ MOVNTDQVdq, Wdq Vdq, Wdq Vdq, Wdq Vdq, Wdq Vdq, Wdq Vdq, Wdq Vq, Wpd Mdq, Vdqinvalid invalid invalid invalid invalid invalid CVTPD2DQ invalidVq, Wpdinvalid PSLLW PSLLD PSLLQ PMULUDQ PMADDWD PSADBW MASKMOVQPq, Qq Pq, Qq Pq, Qq Pq, Qq Pq, Qq Pq, Qq Pq, PRqinvalid invalid invalid invalid invalid invalid invalid invalidFMASKinvalidPSLLW PSLLD PSLLQ PMULUDQ PMADDWD PSADBW66MOVDQUVdq, Wdq Vdq, Wdq Vdq, Wdq Vdq, Wdq Vdq, Wdq Vdq, Wdq Vdq, VRdqLDDQU invalid invalid invalid invalid invalid invalid invalidF2Vpd,MdqNote:1. All two-byte opcodes begin with an OFh byte. Rows in the table show the high nibble of the second opcode bytes, columns showthe low nibble of this byte.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 long mode.382 Appendix A: Opcode and Operand Encodings
24594 Rev. 3.10 February 2005 AMD64 TechnologyTable A-4.Second Byte of Two-Byte Opcodes, Low Nibble 8–FhPrefix Nibble 1 8 9 A B C D E Fn/a 0n/a 1INVD WBINVD invalid UD2 invalid Group P 2 FEMMS 3DNow!PREFETCHSee“3DNow!Opcodes” onpage 390Group 16 2 NOP 3 NOP 3 NOP 3 NOP 3 NOP 3 NOP 3 NOP 3noneF3266F2n/a 3n/a 4noneF3566F2noneF3666F2MOVAPS CVTPI2PS MOVNTPS CVTTPS2PI CVTPS2PI UCOMISS COMISSVps, Wps Wps, Vps Vps, Qq Mdq, Vps Pq, Wps Pq, Wps Vss, Wss Vps, Wpsinvalid invalid CVTSI2SS invalid CVTTSS2SI CVTSS2SI invalid invalidVss, Ed/q Gd/q, Wss Gd/q, WssMOVAPD CVTPI2PD MOVNTPD CVTTPD2PI CVTPD2PI UCOMISD COMISDVpd, Wpd Wpd, Vpd Vpd, Qq Mdq, Vpd Pq, Wpd Pq, Wpd Vsd, Wsd Vpd, Wsdinvalid invalid CVTSI2SD invalid CVTTSD2SI CVTSD2SI invalid invalidVsd, Ed/q Gd/q, Wsd Gd/q, Wsdinvalid invalid invalid invalid invalid invalid invalid invalidCMOVS CMOVNS CMOVP CMOVNP CMOVL CMOVNL CMOVLE CMOVNLEGv, Ev Gv, Ev Gv, Ev Gv, Ev Gv, Ev Gv, Ev Gv, Ev Gv, EvADDPS MULPS CVTPS2PD CVTDQ2PS SUBPS MINPS DIVPS MAXPSVps, Wps Vps, Wps Vpd, Wps Vps, Wdq Vps, Wps Vps, Wps Vps, Wps Vps, WpsADDSS MULSS CVTSS2SD CVTTPS2DQ SUBSS MINSS DIVSS MAXSSVss, Wss Vss, Wss Vsd, Wss Vdq, Wps Vss, Wss Vss, Wss Vss, Wss Vss, WssADDPD MULPD CVTPD2PS CVTPS2DQ SUBPD MINPD DIVPD MAXPDVpd, Wpd Vpd, Wpd Vps, Wpd Vdq, Wps Vpd, Wpd Vpd, Wpd Vpd, Wpd Vpd, WpdADDSD MULSD CVTSD2SS invalid SUBSD MINSD DIVSD MAXSDVsd, Wsd Vsd, Wsd Vss, Wsd Vsd, Wsd Vsd, Wsd Vsd, Wsd Vsd, WsdPUNPCK-HBWPUNPCK-HWDPUNPCK-HDQPACKSSDW invalid invalid MOVD MOVQPq, Qd Pq, Qd Pq, Qd Pq, Qq Pq, Ed/q Pq, Qqinvalid invalid invalid invalid invalid invalid invalid MOVDQUVdq, WdqPUNPCK-HBWPUNPCK-HWDPUNPCK-HDQPACKSSDWPUNPCK-LQDQPUNPCK-HQDQMOVDMOVDQAVdq, Wq Vdq, Wq Vdq, Wq Vdq, Wdq Vdq, Wq Vdq, Wq Vdq, Ed/q Vdq, Wdqinvalid invalid invalid invalid invalid invalid invalid invalidNote:1. All two-byte opcodes begin with an OFh byte. Rows show high opcode nibble (hex), columns show low opcode nibble in hex.2. An opcode extension is specified in the ModRM reg field (bits 5–3). See “ModRM Extensions to One-Byte and Two-Byte Opcodes”on page 387 for details.3. This instruction takes a ModRM byte.Appendix A: Opcode and Operand Encodings 383
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