#include "kernel_Point_update_step.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)
    PointUpdateStepKernel(float* Point_step_k,
                          unsigned int Point_step_k_num_alloc,
                          float* Point_p_kp1,
                          unsigned int Point_p_kp1_num_alloc,
                          const float* const alpha,
                          float* out_Point_step_kp1,
                          unsigned int out_Point_step_kp1_num_alloc,
                          size_t problem_size) {
  const int global_thread_idx = blockIdx.x * blockDim.x + threadIdx.x;
  __shared__ uint8_t inout_shared[4096];

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

  if (global_thread_idx < problem_size) {
    ReadIdx3<1024, float, float, float4>(Point_step_k,
                                         0 * Point_step_k_num_alloc,
                                         global_thread_idx,
                                         r0,
                                         r1,
                                         r2);
    ReadIdx3<1024, float, float, float4>(
        Point_p_kp1, 0 * Point_p_kp1_num_alloc, global_thread_idx, r3, r4, r5);
  };
  LoadUnique<1, float, float>(alpha, 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_step_kp1,
                                          0 * out_Point_step_kp1_num_alloc,
                                          global_thread_idx,
                                          r3,
                                          r4,
                                          r6);
  };
}

void PointUpdateStep(float* Point_step_k,
                     unsigned int Point_step_k_num_alloc,
                     float* Point_p_kp1,
                     unsigned int Point_p_kp1_num_alloc,
                     const float* const alpha,
                     float* out_Point_step_kp1,
                     unsigned int out_Point_step_kp1_num_alloc,
                     size_t problem_size) {
  if (problem_size == 0) {
    return;
  }

  const int n_blocks = (problem_size + 1024 - 1) / 1024;
  PointUpdateStepKernel<<<n_blocks, 1024>>>(Point_step_k,
                                            Point_step_k_num_alloc,
                                            Point_p_kp1,
                                            Point_p_kp1_num_alloc,
                                            alpha,
                                            out_Point_step_kp1,
                                            out_Point_step_kp1_num_alloc,
                                            problem_size);
}

}  // namespace caspar