opcode - definizione. Che cos'è opcode
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Cosa (chi) è opcode - definizione


Opcode         
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
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.
op code         
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
operation code         
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
<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)