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Book-计算机组成原理-科学出版社
Book-计算机组成原理-科学出版社
- 第一章-计算机系统概述
  第一章-计算机系统概述

Program counter

这个寄存器非常重要，它告诉CPU去执行哪一条指令。所有对 control flow 的操作的指令最终都是通过操作这个寄存器的值来实现的。Program counter所指向的肯定是code area，Program counter相当于next pointer，默认情况下它是自加1的，除非通过JMP (x86 instruction)等指令来显示更改它的值。