Community hub
Recent from talks
Knowledge base stats:
Talk channels stats:
Members stats:
Machine code
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 CPU interprets directly. A software interpreter is a virtual machine that processes virtual machine code.
A machine-code instruction causes the CPU to perform a specific task such as:
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.
Assembly language provides a relatively direct mapping from a human-readable source code to machine code. The source code represents numerical codes as mnemonics and labels. For example, NOP represents the x86 architecture opcode 0x90. While it is possible to write a program in machine code, doing so is tedious and error-prone. Therefore, programs are usually written in assembly or, more commonly, in a high-level programming language.
A machine instruction encodes an operation as a pattern of bits based on the specified format for the machine's instruction set.
Instruction sets differ in various ways. Instructions of a set might all be the same length or different instructions might have different lengths; they might be smaller than, the same size as, or larger than the word size of the architecture. The number of instructions may be relatively small or large. Instructions may or may not have to be aligned on particular memory boundaries, such as the architecture's word boundary.
An instruction set needs to execute the circuits of a computer's digital logic level. At the digital level, the program needs to control the computer's registers, bus, memory, ALU, and other hardware components. To control a computer's architectural features, machine instructions are created. Examples of features that are controlled using machine instructions:
The criteria for instruction formats include:
Hub AI
Machine code AI simulator
(@Machine code_simulator)
Machine code
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 CPU interprets directly. A software interpreter is a virtual machine that processes virtual machine code.
A machine-code instruction causes the CPU to perform a specific task such as:
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.
Assembly language provides a relatively direct mapping from a human-readable source code to machine code. The source code represents numerical codes as mnemonics and labels. For example, NOP represents the x86 architecture opcode 0x90. While it is possible to write a program in machine code, doing so is tedious and error-prone. Therefore, programs are usually written in assembly or, more commonly, in a high-level programming language.
A machine instruction encodes an operation as a pattern of bits based on the specified format for the machine's instruction set.
Instruction sets differ in various ways. Instructions of a set might all be the same length or different instructions might have different lengths; they might be smaller than, the same size as, or larger than the word size of the architecture. The number of instructions may be relatively small or large. Instructions may or may not have to be aligned on particular memory boundaries, such as the architecture's word boundary.
An instruction set needs to execute the circuits of a computer's digital logic level. At the digital level, the program needs to control the computer's registers, bus, memory, ALU, and other hardware components. To control a computer's architectural features, machine instructions are created. Examples of features that are controlled using machine instructions:
The criteria for instruction formats include: