coupled_vector_bc_projector_kernel.h

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#ifndef __BC_HIP_COUPLED_VECTOR_BC_PROJECTOR_KERNEL__
#define __BC_HIP_COUPLED_VECTOR_BC_PROJECTOR_KERNEL__
 
template< typename T >
__global__ void coupled_vector_bc_projector_apply_kernel(
    const int * __restrict__ mixed_msk,
    T * __restrict__ x,
    T * __restrict__ y,
    T * __restrict__ z,
    const int * __restrict__ constraint_n,
    const int * __restrict__ constraint_t1,
    const int * __restrict__ constraint_t2,
    const T * __restrict__ n,
    const T * __restrict__ t1,
    const T * __restrict__ t2,
    const int m) {
 
  const int idx = blockIdx.x * blockDim.x + threadIdx.x;
  const int str = blockDim.x * gridDim.x;
 
  for (int i = idx; i < m; i += str) {
    const int k = mixed_msk[i];
    const int off = 3 * i;
 
    T u1 = x[k];
    T u2 = y[k];
    T u3 = z[k];
 
    T uloc_n = u1 * n[off] + u2 * n[off + 1] + u3 * n[off + 2];
    T uloc_t1 = u1 * t1[off] + u2 * t1[off + 1] + u3 * t1[off + 2];
    T uloc_t2 = u1 * t2[off] + u2 * t2[off + 1] + u3 * t2[off + 2];
 
    if (constraint_n[i] != 0)
      uloc_n = 0;
    if (constraint_t1[i] != 0)
      uloc_t1 = 0;
    if (constraint_t2[i] != 0)
      uloc_t2 = 0;
 
    x[k] = uloc_n * n[off] + uloc_t1 * t1[off] + uloc_t2 * t2[off];
    y[k] = uloc_n * n[off + 1] + uloc_t1 * t1[off + 1] +
           uloc_t2 * t2[off + 1];
    z[k] = uloc_n * n[off + 2] + uloc_t1 * t1[off + 2] +
           uloc_t2 * t2[off + 2];
  }
}
 
#endif