makeext_kernel.h

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#ifndef __COMMON_MAKEEXT_KERNEL__
#define __COMMON_MAKEEXT_KERNEL__
 
template< typename T >
__global__ void makeext_kernel(T * __restrict__ abx1,
                               T * __restrict__ aby1,
                               T * __restrict__ abz1,
                               T * __restrict__ abx2,
                               T * __restrict__ aby2,
                               T * __restrict__ abz2,
                               T * __restrict__ bfx,
                               T * __restrict__ bfy,
                               T * __restrict__ bfz,
                               const T rho,
                               const T ab1,
                               const T ab2,
                               const T ab3,
                               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) {
    T ta1_val = ab2 * abx1[i] + ab3 * abx2[i];
    T ta2_val = ab2 * aby1[i] + ab3 * aby2[i];
    T ta3_val = ab2 * abz1[i] + ab3 * abz2[i];
 
    abx2[i] = abx1[i];
    aby2[i] = aby1[i];
    abz2[i] = abz1[i];
    abx1[i] = bfx[i];
    aby1[i] = bfy[i];
    abz1[i] = bfz[i];
 
    bfx[i] = (ab1 * bfx[i] + ta1_val) * rho;
    bfy[i] = (ab1 * bfy[i] + ta2_val) * rho;
    bfz[i] = (ab1 * bfz[i] + ta3_val) * rho;
  } 
  
}
 
template< typename T >
__global__ void scalar_makeext_kernel(T * __restrict__ fs_lag,
                                      T * __restrict__ fs_laglag,
                                      T * __restrict__ fs,
                                      const T rho,
                                      const T ext1,
                                      const T ext2,
                                      const T ext3,
                                      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) {
    T ta1_val = ext2 * fs_lag[i] + ext3 * fs_laglag[i];
 
    fs_laglag[i] = fs_lag[i];
    fs_lag[i] = fs[i];
 
    fs[i] = (ext1 * fs[i] + ta1_val) * rho;
  } 
  
}
 
#endif // __COMMON_MAKEEXT_KERNEL__