#include "kernel_Point_update_step_first.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)
    PointUpdateStepFirstKernel(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;

  if (global_thread_idx < problem_size) {
    ReadIdx3<1024, float, float, float4>(
        Point_p_kp1, 0 * Point_p_kp1_num_alloc, global_thread_idx, r0, r1, r2);
  };
  LoadUnique<1, float, float>(alpha, 0, (float*)inout_shared);
  if (global_thread_idx < problem_size) {
    ReadShared1<float>((float*)inout_shared, 0, r3);
  };
  __syncthreads();
  if (global_thread_idx < problem_size) {
    r0 = r0 * r3;
    r1 = r1 * r3;
    r3 = r2 * r3;
    WriteIdx3<1024, float, float, float4>(out_Point_step_kp1,
                                          0 * out_Point_step_kp1_num_alloc,
                                          global_thread_idx,
                                          r0,
                                          r1,
                                          r3);
  };
}

void PointUpdateStepFirst(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;
  PointUpdateStepFirstKernel<<<n_blocks, 1024>>>(Point_p_kp1,
                                                 Point_p_kp1_num_alloc,
                                                 alpha,
                                                 out_Point_step_kp1,
                                                 out_Point_step_kp1_num_alloc,
                                                 problem_size);
}

}  // namespace caspar