![]() ![]() They don't call the x86 CPU a Complex Instruction Set Computer (CISC) for nothing!Īlthough more complex instruction encodings exist, no one is going to challenge that the x86 has a complex instruction encoding:Īlthough the diagram seems to imply that instructions can be up to 16 bytes long, in actuality the x86 will not allow instructions greater than 15 bytes in length. It is time to take a look that the actual machine instruction format of the x86 CPU family. Chapter 3 of Intel Instruction Set Reference.Intel Instruction Set Reference (Volume2).Intel Architecture Software Developer's Manual.Encoding Eight, Sixteen, and Thirty-Two Bit Operands. ![]() Encoding ADD EDX, DISPLACEMENT Instruction.Encoding x86 Instruction Operands, MOD-REG-R/M Byte. ![]()
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