#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(float* Point_r_k,
                       unsigned int Point_r_k_num_alloc,
                       float* Point_w,
                       unsigned int Point_w_num_alloc,
                       const float* const negalpha,
                       float* out_Point_r_kp1,
                       unsigned int out_Point_r_kp1_num_alloc,
                       float* 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[4096];

  __shared__ float out_Point_r_kp1_norm2_tot_local[1];

  float r0, r1, r2, r3, r4, r5, r6;

  if (global_thread_idx < problem_size) {
    ReadIdx3<1024, float, float, float4>(
        Point_r_k, 0 * Point_r_k_num_alloc, global_thread_idx, r0, r1, r2);
    ReadIdx3<1024, float, float, float4>(
        Point_w, 0 * Point_w_num_alloc, global_thread_idx, r3, r4, r5);
  };
  LoadUnique<1, float, float>(negalpha, 0, (float*)inout_shared);
  if (global_thread_idx < problem_size) {
    ReadShared1<float>((float*)inout_shared, 0, r6);
  };
  __syncthreads();
  if (global_thread_idx < problem_size) {
    r3 = fmaf(r3, r6, r0);
    r4 = fmaf(r4, r6, r1);
    r6 = fmaf(r5, r6, r2);
    WriteIdx3<1024, float, float, float4>(out_Point_r_kp1,
                                          0 * out_Point_r_kp1_num_alloc,
                                          global_thread_idx,
                                          r3,
                                          r4,
                                          r6);
    r3 = fmaf(r3, r3, r6 * r6);
    r3 = fmaf(r4, r4, r3);
  };
  SumStore<float>(out_Point_r_kp1_norm2_tot_local,
                  (float*)inout_shared,
                  0,
                  global_thread_idx < problem_size,
                  r3);
  SumFlushFinal<float>(
      out_Point_r_kp1_norm2_tot_local, out_Point_r_kp1_norm2_tot, 1);
}

void PointUpdateR(float* Point_r_k,
                  unsigned int Point_r_k_num_alloc,
                  float* Point_w,
                  unsigned int Point_w_num_alloc,
                  const float* const negalpha,
                  float* out_Point_r_kp1,
                  unsigned int out_Point_r_kp1_num_alloc,
                  float* 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