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I would like to share with you which part that points out the address of the instruction to be executed by cpu next time. I believe most people don't know much about it, so share this article for your reference. I hope you will learn a lot after reading this article. Let's learn about it together.

The part that indicates the address of the next instruction to be executed by cpu is the program counter. In order to ensure that the program can be executed continuously, the processor must have some means to determine the address of the next instruction; and the program counter plays this role. After each instruction is obtained, the program counter points to the next instruction in the order.

The part that indicates the address of the next instruction to be executed by cpu is the program counter.

In order to ensure that a program (understood in the operating system as a process) can be executed continuously, the processor must have some means to determine the address of the next instruction. The program counter plays this role, so it is often called instruction counter.

Before the program starts to execute, its starting address, that is, the address of the memory unit where the first instruction of the program is located, must be sent to the program counter, so the content of the program counter is the address of an instruction extracted from memory.

When an instruction is executed, the processor automatically modifies the contents of the PC, that is, an additional amount of PC for each instruction executed, which is equal to the number of bytes contained in the instruction, so that it always maintains the address of the next instruction to be executed.

Since most instructions are executed sequentially, the process of modification is usually as simple as adding 1 to the PC.

However, when a transfer instruction such as JMP (jump, foreign language full name: JUMP) instruction is encountered, the address of the subsequent instruction (that is, the content of PC) must be obtained from the address field in the instruction register. In this case, the next instruction to be fetched from memory will be specified by the transfer instruction, rather than being taken in order as usual. Therefore, the structure of the program counter should be a structure with two functions of registering information and counting.

The above is all the contents of the article "indicating which part of the next instruction address to be executed by cpu". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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