sumab_kernel.h

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#ifndef __COMMON_SUMAB_KERNEL__
#define __COMMON_SUMAB_KERNEL__
 
template< typename T >
__global__ void sumab_kernel(T * __restrict__ u,
                             T * __restrict__ v,
                             T * __restrict__ w,
                             const T * __restrict__ uu,
                             const T * __restrict__ vv,
                             const T * __restrict__ ww,
                             const T * __restrict__ ulag1,
                             const T * __restrict__ ulag2,
                             const T * __restrict__ vlag1,
                             const T * __restrict__ vlag2,
                             const T * __restrict__ wlag1,
                             const T * __restrict__ wlag2,
                             const T ab1,
                             const T ab2,
                             const T ab3,
                             const int nab,
                             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) {
    u[i] = ab1 * uu[i] + ab2 * ulag1[i];
    v[i] = ab1 * vv[i] + ab2 * vlag1[i];
    w[i] = ab1 * ww[i] + ab2 * wlag1[i];
  }
 
  if (nab == 3) {
    for (int i = idx; i < n; i += str) {
      u[i] = u[i] + ab3 * ulag2[i];
      v[i] = v[i] + ab3 * vlag2[i];
      w[i] = w[i] + ab3 * wlag2[i];
    } 
  }
  
}
 
#endif // __COMMON_SUMAB_KERNEL__