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使用ccs3.3开Register(-o0)优化会将程序中哪些东西优化掉?



使用ccs3.3开Register(-o0)优化会将程序中哪些东西优化掉?为什么我不开优化的时候程序中变量取两次数据都是是对的,开-o0优化之后变量就只能正确的取到1次数据,第二次变量就取不到数据?