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finish hw04 #19

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chaixuqing wants to merge 1 commit into parallel101:main from chaixuqing:main

chaixuqing commented Jan 12, 2022

加速之前

Initial energy: -13.414000
Final energy: -13.356842
Time elapsed: 1373 ms

加速之后

Initial energy: -13.413999
Final energy: -13.403915
Time elapsed: 100 ms

将frand()函数声明为 static，有几毫秒的提升。
将Star结构体的内存布局改为SOA，同时设置内存对齐（基本没有提升）
将计算eps的平方放在循环外面，同时打上括号(G * dt)帮助编译器识别
将px, py, pz的值在循环之外赋值给局部变量，减少读取次数。将内部循环中关于vx, vy, vz的累加，先读到局部变量，累加完毕后再写入
给sqrt加 std:: 前缀，矢量化成功
对小循环体用 #pragma unroll
编译选项中加入-ffast-math -march=native


          finish hw04

da0ee18

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