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The x86 instruction set refers to the set of instructions that x86-compatible microprocessors The updated instruction set is also grouped according to architecture (i386, i486, i686) and more generally is Instruction, Meaning, Notes, Opcode 1. Encoding Real x86 Instructions. It is time to take a look that the actual machine instruction format of the x86 CPU family. They don't call the x86 CPU a Complex Instruction Set Computer (CISC) for nothing! 17.2 Instruction Format. Most instructions that can refer to an operand in memory have an addressing form byte following the primary opcode byte(s). This byte, called the ModR/M byte, specifies the address form to be used. 7 Mar 2016 Machine instructions (the ones and zeros that tell your computer what to do next) have a portion called the opcode that determines what"mov" is the "opcode", "instruction", or "mnemonic". It corresponds to the Meaning (note: not the official meanings!) . 24908886 i386/i386/binary/sets/base.tgz This chapter presents instructions for the 80386 in alphabetical order. For each instruction, the forms are given for each operand combination, including object code produced, operands required, XLAT/XLATB Table Look-up Translation 32-bit mode changes the meaning of the size bit to distinguish between 32-bit operands and 8-bit Simple instructions such as NOP require just the opcode. Encoding x86 Instruction Operands, MOD-REG-R/M Byte .. and the standard ADD instruction is the meaning of the REG field in the MOD-REG-R/M byte:. 30 Mar 2017 Instead of that terse online material, you should read the official intel instruction set reference where all this is explained in detail. Let me quote the relevant 18 Feb 2017 X86 Opcode and Instruction Reference. MazeGen, 2017-02-18. Revision: 1.12. This reference is intended to be precise opcode and instruction set reference (including x86-64). Its principal aim is exact definition of instruction parameters and attributes.