XOR'ing a register with itself is the idiom for zeroing it out. Why not sub?
在汇编语言中，使用XOR指令将寄存器与自身进行异或操作是清零寄存器的惯用方法，而不是使用SUB指令。这是因为XOR指令通常更短小、更快速，并且能避免某些处理器上的部分寄存器停顿问题，同时生成相同的零值结果。
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