#include "kernel_Point_start_w.h"
#include "memops.cuh"
#include <cooperative_groups.h>
#include <cooperative_groups/details/partitioning.h>
#include <cooperative_groups/memcpy_async.h>
#include <cooperative_groups/reduce.h>
#include <cuda_runtime.h>

namespace cg = cooperative_groups;

namespace caspar {

__global__ void __launch_bounds__(1024, 1)
    PointStartWKernel(double* Point_precond_diag,
                      unsigned int Point_precond_diag_num_alloc,
                      const double* const diag,
                      double* Point_p,
                      unsigned int Point_p_num_alloc,
                      double* out_Point_w,
                      unsigned int out_Point_w_num_alloc,
                      size_t problem_size) {
  const int global_thread_idx = blockIdx.x * blockDim.x + threadIdx.x;
  __shared__ uint8_t inout_shared[8192];

  double r0, r1, r2, r3, r4;

  if (global_thread_idx < problem_size) {
    ReadIdx2<1024, double, double, double2>(Point_precond_diag,
                                            0 * Point_precond_diag_num_alloc,
                                            global_thread_idx,
                                            r0,
                                            r1);
  };
  LoadUnique<1, double, double>(diag, 0, (double*)inout_shared);
  if (global_thread_idx < problem_size) {
    ReadShared1<double>((double*)inout_shared, 0, r2);
  };
  __syncthreads();
  if (global_thread_idx < problem_size) {
    r0 = r0 * r2;
    ReadIdx2<1024, double, double, double2>(
        Point_p, 0 * Point_p_num_alloc, global_thread_idx, r3, r4);
    r0 = r0 * r3;
    r1 = r1 * r2;
    r1 = r1 * r4;
    WriteIdx2<1024, double, double, double2>(
        out_Point_w, 0 * out_Point_w_num_alloc, global_thread_idx, r0, r1);
    ReadIdx1<1024, double, double, double>(Point_precond_diag,
                                           2 * Point_precond_diag_num_alloc,
                                           global_thread_idx,
                                           r1);
    r2 = r1 * r2;
    ReadIdx1<1024, double, double, double>(
        Point_p, 2 * Point_p_num_alloc, global_thread_idx, r1);
    r2 = r2 * r1;
    WriteIdx1<1024, double, double, double>(
        out_Point_w, 2 * out_Point_w_num_alloc, global_thread_idx, r2);
  };
}

void PointStartW(double* Point_precond_diag,
                 unsigned int Point_precond_diag_num_alloc,
                 const double* const diag,
                 double* Point_p,
                 unsigned int Point_p_num_alloc,
                 double* out_Point_w,
                 unsigned int out_Point_w_num_alloc,
                 size_t problem_size) {
  if (problem_size == 0) {
    return;
  }

  const int n_blocks = (problem_size + 1024 - 1) / 1024;
  PointStartWKernel<<<n_blocks, 1024>>>(Point_precond_diag,
                                        Point_precond_diag_num_alloc,
                                        diag,
                                        Point_p,
                                        Point_p_num_alloc,
                                        out_Point_w,
                                        out_Point_w_num_alloc,
                                        problem_size);
}

}  // namespace caspar