A similar mode is relative addressing mode, which calculates the address based on the current program counter.
稍微简单的一种模式是相对寻址模式，它会根据当前程序计数器来计算地址。
A register in the processor that contains the address of the next instruction to be executed. Also known as a program counter.
包含下一条要执行指令地址的处理器中的寄存器。也叫程序计数器。
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