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我在ccs5中测试我的算法的吞吐率，开启-o3优化后，吞吐率几乎提高了一倍，请问这个三级优化到底是优化了什么可以产生如此大的变化？还有其他几级优化呢？
在编译器手册SPRU186及SPRU187中有详细介绍。
