cheby_aux.cu

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#include <device/device_config.h>
#include <device/cuda/check.h>
 
 
template< typename T >
__global__ void cheby_part1(T * __restrict__ d,
                            T * __restrict__ x,
                            const T inv_tha,
                            const int n) {
 
  const int idx = blockIdx.x * blockDim.x + threadIdx.x;
  const int str = blockDim.x * gridDim.x;
 
  for (int i = idx; i < n; i += str) {
    const real dt = d[i] * inv_tha;
    d[i] = dt;
    x[i] = x[i] + dt;    
  }  
}
 
template< typename T >
__global__ void cheby_part2(T * __restrict__ d,
                            T * __restrict__ w,
                            T * __restrict__ x,
                            const T tmp1,
                            const T tmp2,
                            const int n) {
 
  const int idx = blockIdx.x * blockDim.x + threadIdx.x;
  const int str = blockDim.x * gridDim.x;
 
  for (int i = idx; i < n; i += str) {
    const real dt = tmp1 * d[i] + tmp2 * w[i];
    d[i] = dt;
    x[i] = x[i] + dt; 
  }  
}
 
extern "C" {
 
  void cuda_cheby_part1(void *d, void *x,
                       real *inv_tha, int *n, cudaStream_t strm) {
    
    const dim3 nthrds(1024, 1, 1);
    const dim3 nblcks(((*n)+1024 - 1)/ 1024, 1, 1);
    
    cheby_part1<real><<<nblcks, nthrds, 0, strm>>>((real *) d, (real *) x, *inv_tha, *n);
    CUDA_CHECK(cudaGetLastError());
    
  }
  
  void cuda_cheby_part2(void *d, void *w, void *x,
                       real *tmp1, real *tmp2, int *n, cudaStream_t strm) {
 
    const dim3 nthrds(1024, 1, 1);
    const dim3 nblcks(((*n)+1024 - 1)/ 1024, 1, 1);
    
    cheby_part2<real>
      <<<nblcks, nthrds, 0, strm>>>((real *) d, (real *) w, (real *) x, *tmp1, *tmp2, *n);
    CUDA_CHECK(cudaGetLastError());
    
  }
}