小编ztd*_*dep的帖子

我正在研究基于Visual Studio 2008的CUDA.你能告诉我如何使语法高亮显示在.cu文件中吗？

我对__shfl_down和__shfl_down_sync感到困惑,他们给出了不同的结果.

__global__ void shufledown1(double* a, double *b,double *c, int N)
{
    double  temp = 2.0;
    __syncthreads();

   for (int offset = 32/2; offset > 0; offset /= 2){
         temp+=__shfl_down(temp, offset,32);
   }
    printf("%d %f %d \n",threadIdx.x ,temp,blockDim.x * gridDim.x);
}
__global__ void shufledown2(double* a, double *b,double *c, int N)
{
    double  temp = 2.0;
    __syncthreads();

   for (int offset = 32/2; offset > 0; offset /= 2){
       temp+=__shfl_down_sync(temp, offset,32)
   }
    printf("%d %f %d \n",threadIdx.x ,temp,blockDim.x * gridDim.x);
}

第一个给出:

0 64.000000 64 
''''' …