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INTEL汇编指令集

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INTEL 汇编指令集 Intel Assemble Instru ction Set Intel 8086 Family Architecture General Purpose Registers Segment Registers AH/AL AX (EAX) Accumulator CS Code Segment BH/BL BX (EBX) Base DS Data Segment CH/CL CX (ECX) Counter SS Stack Segment DH/DL DX (EDX) Data ES Extra Segment (FS) 386 and newer (Exx) indicates 386+ 32 bit register (GS) 386 and newer Pointer Registers Stack Registers SI (ESI) Source Index SP (ESP) Stack Pointer DI (EDI) Destination Index BP (EBP) Base Pointer IP Instruction Pointer Status Registers FLAGS Status Flags (see FLAGS) Special Registers (386+ only) CR0 Control Register 0 DR0 Debug Register 0 CR2 Control Register 2 DR1 Debug Register 1 CR3 Control Register 3 DR2 Debug Register 2 DR3 Debug Register 3 TR4 Test Register 4 DR6 Debug Register 6 TR5 Test Register 5 DR7 Debug Register 7 TR6 Test Register 6 TR7 Test Register 7 Register Default Segment Valid Overrides BP SS DS, ES, CS SI or DI DS ES, SS, CS DI strings ES None SI strings DS ES, SS, CS - see CPU DETECTING Instruction Timing Instruction Clock Cycle Calculation Some instructions require additional clock cycles due to a "Next Instruction Component" identified by a "+m" in the instruction clock cycle listings. This is due to the prefetch queue being purge on a control transfers. Below is the general rule for calculating "m": 88/86 not applicable 286 "m" is the number of bytes in the next instruction 386 "m" is the number of components in the next instruction (the instruction coding (each byte), plus the data and the displacement are all considered components) 8088/8086 Effective Address (EA) Calculation Description Clock Cycles Displacement 6 Base or Index (BX,BP,SI,DI) 5 Displacement+(Base or Index) 9 Bas...

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INTEL汇编指令集

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