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试了各种方法，从godbolt.org边看汇编出来的代码边调试，把数组下标从int改成size_t以后有一点的提升，加了-ffast-math和-march=native以后提升明显，把star的结构体从AOS改成了SOA，提升了很多，把一些临时变量变成了数组，空间换时间，alignas试了8，16，32，64，128，32和64差不多都比较好，128会有所下降，还有就是把一些比较复杂的循环拆成了一些小循环，有一点点提升，#prama omp simd在所有循环之前都加了，但测试好像只要在最外层循环外面加就行，里面加不加都不影响，看汇编发现三个及以上的连乘好像会比两个数乘法更复杂的样子，不知道会不会降低速度。
baseline的结果是：
Initial energy: -8.571528
Final energy: -8.511633
Time elapsed: 1546 ms
优化以后：
simd optimized
Initial energy: -9.936085
Final energy: -9.926659
Time elapsed: 198 ms
大概提升了7.8倍