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What (who) is op-code - definition
PART OF A MACHINE INSTRUCTION
Op code; Instruction code; Instruction code (programming); Opcode (programming); Opcodes; Op-code; Operation code; Opstring; Software instruction set; Instruction syllable; Operation string; Instruction opcode; Instruction word; Instruction byte; OpCode; Opcode sequence; Instruction parcel; Processor opcode; Instruction machine code; Instruction packet; Instruction token; Operation code (computing); Program string; Opcode string
op code
operation code
<programming> (Or "op code") The part or parts of a {machine
language} instruction which determines what kind of action the
computer should take, e.g. add, jump, load, store. In any
particular instruction set certain fixed bit positions
within the instruction word contain the op code, others give
parameters such as the addresses or registers involved.
For example, in a 32-bit instruction the most significant
eight bits might be the op code giving 256 possible
operations.
For some instruction sets, certain values in the fixed bit
positions may select a group of operations and the exact
operation may depend on other bits within instruction word or
subsequent words.
When programming in assembly language, the op code is
represented by a readable name called an {instruction
mnemonic}.
(1997-02-14)
Opcode
In computing, an opcode (abbreviated from operation code, also known as instruction machine code, instruction code, instruction syllable, instruction parcel or opstring) is the portion of a machine language instruction that specifies the operation to be performed. Beside the opcode itself, most instructions also specify the data they will process, in the form of operands.
Wikipedia
Opcode
In computing, an opcode (abbreviated from operation code, also known as instruction machine code, instruction code, instruction syllable, instruction parcel or opstring) is the portion of a machine language instruction that specifies the operation to be performed. Beside the opcode itself, most instructions also specify the data they will process, in the form of operands. In addition to opcodes used in the instruction set architectures of various CPUs, which are hardware devices, they can also be used in abstract computing machines as part of their byte code specifications.
