Machine Code

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In computing, machine code is data encoded and structured to control a computer's central processing unit (CPU) via its programmable interface. A computer program consists primarily of sequences of machine-code instructions. Machine code is classified as native with respect to its host CPU since it is the language that the CPU interprets directly. Some software interpreters translate the programming language that they interpret into a virtual machine code (bytecode) and process it with a P-code machine. A machine-code instruction causes the CPU to perform a specific task such as: Load a word from memory to a CPU register Execute an arithmetic logic unit (ALU) operation on one or more registers or memory locations Jump or skip to an instruction that is not the next one An instruction set architecture (ISA) defines the interface to a CPU and varies by groupings or families of CPU design such as x86 and ARM. Generally, machine code compatible with one family is not with others, but there are exceptions. The VAX architecture includes optional support of the PDP-11 instruction set. The IA-64 architecture includes optional support of the IA-32 instruction set. And, the PowerPC 615 can natively process both PowerPC and x86 instructions.