如何提高我的双for循环，10000*10000，每循环一次内循序要3到4毫秒

Question

内循环就是一个求两个距离再IF判断距离符合要求值么符合就记住。据说可以用C++AMP，但不怎么会这个，求指点！

Answer 1

这个得看你的需求，使用AMP的话， 得结合实际需求，比如：

#include
#include
using namespace concurrency;

const int size = 5;

void CppAmpMethod() {
int aCPP[] = {1, 2, 3, 4, 5};
int bCPP[] = {6, 7, 8, 9, 10};
int sumCPP[size];

// Create C++ AMP objects.
array_view<const int, 1> a(size, aCPP);
array_view<const int, 1> b(size, bCPP);
array_view<int, 1> sum(size, sumCPP);
sum.discard_data();

parallel_for_each( 
    // Define the compute domain, which is the set of threads that are created.
    sum.extent, 
    // Define the code to run on each thread on the accelerator.
    [=](index<1> idx) restrict(amp)
{
    sum[idx] = a[idx] + b[idx];
}
);

// Print the results. The expected output is "7, 9, 11, 13, 15".
for (int i = 0; i < size; i++) {
    std::cout << sum[i] << "\n";
}

}