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如果我想用寄存器地址(如 jr 指令)更新 32 位单周期数据路径中的程序计数器,在更新 PC 之前我需要做什么?
从指令中获取的 5 位寄存器号作为 PC 目标是否需要在更新 PC 之前进行符号扩展至 32 位?