#include "kernel_Point_update_r.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)
    PointUpdateRKernel(double* Point_r_k,
                       unsigned int Point_r_k_num_alloc,
                       double* Point_w,
                       unsigned int Point_w_num_alloc,
                       const double* const negalpha,
                       double* out_Point_r_kp1,
                       unsigned int out_Point_r_kp1_num_alloc,
                       double* const out_Point_r_kp1_norm2_tot,
                       size_t problem_size) {
  const int global_thread_idx = blockIdx.x * blockDim.x + threadIdx.x;
  __shared__ uint8_t inout_shared[8192];

  __shared__ double out_Point_r_kp1_norm2_tot_local[1];

  double r0, r1, r2, r3, r4;

  if (global_thread_idx < problem_size) {
    ReadIdx2<1024, double, double, double2>(
        Point_r_k, 0 * Point_r_k_num_alloc, global_thread_idx, r0, r1);
    ReadIdx2<1024, double, double, double2>(
        Point_w, 0 * Point_w_num_alloc, global_thread_idx, r2, r3);
  };
  LoadUnique<1, double, double>(negalpha, 0, (double*)inout_shared);
  if (global_thread_idx < problem_size) {
    ReadShared1<double>((double*)inout_shared, 0, r4);
  };
  __syncthreads();
  if (global_thread_idx < problem_size) {
    r2 = fma(r2, r4, r0);
    r3 = fma(r3, r4, r1);
    WriteIdx2<1024, double, double, double2>(out_Point_r_kp1,
                                             0 * out_Point_r_kp1_num_alloc,
                                             global_thread_idx,
                                             r2,
                                             r3);
    ReadIdx1<1024, double, double, double>(
        Point_r_k, 2 * Point_r_k_num_alloc, global_thread_idx, r1);
    ReadIdx1<1024, double, double, double>(
        Point_w, 2 * Point_w_num_alloc, global_thread_idx, r0);
    r4 = fma(r0, r4, r1);
    WriteIdx1<1024, double, double, double>(
        out_Point_r_kp1, 2 * out_Point_r_kp1_num_alloc, global_thread_idx, r4);
    r2 = fma(r2, r2, r4 * r4);
    r2 = fma(r3, r3, r2);
  };
  SumStore<double>(out_Point_r_kp1_norm2_tot_local,
                   (double*)inout_shared,
                   0,
                   global_thread_idx < problem_size,
                   r2);
  SumFlushFinal<double>(
      out_Point_r_kp1_norm2_tot_local, out_Point_r_kp1_norm2_tot, 1);
}

void PointUpdateR(double* Point_r_k,
                  unsigned int Point_r_k_num_alloc,
                  double* Point_w,
                  unsigned int Point_w_num_alloc,
                  const double* const negalpha,
                  double* out_Point_r_kp1,
                  unsigned int out_Point_r_kp1_num_alloc,
                  double* const out_Point_r_kp1_norm2_tot,
                  size_t problem_size) {
  if (problem_size == 0) {
    return;
  }

  const int n_blocks = (problem_size + 1024 - 1) / 1024;
  PointUpdateRKernel<<<n_blocks, 1024>>>(Point_r_k,
                                         Point_r_k_num_alloc,
                                         Point_w,
                                         Point_w_num_alloc,
                                         negalpha,
                                         out_Point_r_kp1,
                                         out_Point_r_kp1_num_alloc,
                                         out_Point_r_kp1_norm2_tot,
                                         problem_size);
}

}  // namespace caspar