确实，用寄存器自身异或来清零是惯用方法，但为什么不用减法呢？

本文探讨了为什么在汇编编程中，使用XOR指令将寄存器与自身进行异或操作来清零成为最流行的做法，而不是使用SUB减法指令。虽然两者都能实现清零效果，但XOR在某些处理器架构上具有性能优势。

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