#include "kernel_Point_pred_decrease_times_two.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)
    PointPredDecreaseTimesTwoKernel(float* Point_step,
                                    unsigned int Point_step_num_alloc,
                                    float* Point_precond_diag,
                                    unsigned int Point_precond_diag_num_alloc,
                                    const float* const diag,
                                    float* Point_njtr,
                                    unsigned int Point_njtr_num_alloc,
                                    float* const out_Point_pred_dec,
                                    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_pred_dec_local[1];

  float r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10;

  if (global_thread_idx < problem_size) {
    ReadIdx3<1024, float, float, float4>(
        Point_step, 0 * Point_step_num_alloc, global_thread_idx, r0, r1, r2);
    ReadIdx3<1024, float, float, float4>(
        Point_njtr, 0 * Point_njtr_num_alloc, global_thread_idx, r3, r4, r5);
    ReadIdx3<1024, float, float, float4>(Point_precond_diag,
                                         0 * Point_precond_diag_num_alloc,
                                         global_thread_idx,
                                         r6,
                                         r7,
                                         r8);
    r9 = r2 * r8;
  };
  LoadUnique<1, float, float>(diag, 0, (float*)inout_shared);
  if (global_thread_idx < problem_size) {
    ReadShared1<float>((float*)inout_shared, 0, r10);
  };
  __syncthreads();
  if (global_thread_idx < problem_size) {
    r9 = fmaf(r10, r9, r5);
    r5 = r0 * r6;
    r5 = fmaf(r10, r5, r3);
    r5 = fmaf(r0, r5, r2 * r9);
    r9 = r1 * r7;
    r9 = fmaf(r10, r9, r4);
    r5 = fmaf(r1, r9, r5);
  };
  SumStore<float>(out_Point_pred_dec_local,
                  (float*)inout_shared,
                  0,
                  global_thread_idx < problem_size,
                  r5);
  SumFlushFinal<float>(out_Point_pred_dec_local, out_Point_pred_dec, 1);
}

void PointPredDecreaseTimesTwo(float* Point_step,
                               unsigned int Point_step_num_alloc,
                               float* Point_precond_diag,
                               unsigned int Point_precond_diag_num_alloc,
                               const float* const diag,
                               float* Point_njtr,
                               unsigned int Point_njtr_num_alloc,
                               float* const out_Point_pred_dec,
                               size_t problem_size) {
  if (problem_size == 0) {
    return;
  }

  const int n_blocks = (problem_size + 1024 - 1) / 1024;
  PointPredDecreaseTimesTwoKernel<<<n_blocks, 1024>>>(
      Point_step,
      Point_step_num_alloc,
      Point_precond_diag,
      Point_precond_diag_num_alloc,
      diag,
      Point_njtr,
      Point_njtr_num_alloc,
      out_Point_pred_dec,
      problem_size);
}

}  // namespace caspar