What is the function of instruction register

The function of the instruction register is to store instructions, decode instructions, execute instructions, and control instruction flow. Detailed introduction: 1. Store the instruction. When the computer retrieves an instruction from the memory, the instruction will be copied to the instruction register. The instruction register is responsible for temporarily storing the binary representation of the instruction; 2. Decoding the instruction. Once the instruction is stored in In the instruction register, the CPU can determine the operation that should be performed by decoding the contents of the instruction register; 3. Instruction execution. After decoding is completed, the CPU will perform corresponding operations based on the instruction contents stored in the instruction register, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

The Instruction Register is an important register in the computer, used to store the instructions currently being executed. Its function is to load instructions from the computer's memory into the CPU for execution.

Specifically, the function of the instruction register is as follows:

1. Storing instructions: When the computer fetches an instruction from memory, the instruction is copied to the instruction register middle. The instruction register is responsible for temporarily storing the binary representation of the instruction.

2. Decoding instructions: Once an instruction is stored in the instruction register, the CPU can determine the operation that should be performed by decoding the contents of the instruction register. During the process of decoding instructions, the CPU determines the corresponding operations and data based on different parts of the instruction (such as opcodes, operands, etc.).

3. Instruction execution: After decoding is completed, the CPU will perform corresponding operations based on the instruction content stored in the instruction register. This may involve reading or writing to registers, memory, or other devices to complete the task described by the instruction.

4. Instruction flow control: The instruction register can also be used to manage instruction flow control. For example, in a sequential computer architecture, the instruction register stores and executes instructions one by one to control the order in which the program executes.

In general, the instruction register plays a key role in storing, decoding, and executing instructions in the computer. It helps the CPU to process the instruction stream correctly and ensures that the computer performs specified operations as required by the program.

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