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上文说到，CPU执行32位访问时期望一个偶地址，但是SP开始时是个偶地址，经过加1就会变成一个奇地址，这不前后矛盾了吗？
除非进行的是ASP指令才是对齐堆栈啊。。。请TI大神解惑。
压栈前SP+1这个对齐应该是CPU自动做的，不需要软件去做。
