hw04 done #36
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hw04 done #36
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os: windows store下的Ubuntu20.04
gcc version: 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
初始运行时间：1220ms
优化：
1. -ffast-math -march=native
2. SOA替换AOS
3. 循环的i修改为size_t
4. 使用std下的数学函数
5. 乘法替换除法
6. 热代码计算部分的常量都提前计算好再放入循环中
7. #pragma GCC unroll 效果不大
最终优化时间：128ms
在修改后的代码基础上，只修改Star，修改为std::array，速度就变为700+ms了，没做详细研究
感谢小彭老师，年轻人的第一次优化