#include "kernel_PinholeFocal_normalize.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)
    PinholeFocalNormalizeKernel(double* precond_diag,
                                unsigned int precond_diag_num_alloc,
                                double* precond_tril,
                                unsigned int precond_tril_num_alloc,
                                double* njtr,
                                unsigned int njtr_num_alloc,
                                const double* const diag,
                                double* out_normalized,
                                unsigned int out_normalized_num_alloc,
                                size_t problem_size) {
  const int global_thread_idx = blockIdx.x * blockDim.x + threadIdx.x;
  __shared__ uint8_t inout_shared[8192];

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

  if (global_thread_idx < problem_size) {
    ReadIdx2<1024, double, double, double2>(
        njtr, 0 * njtr_num_alloc, global_thread_idx, r0, r1);
    ReadIdx2<1024, double, double, double2>(
        precond_diag, 0 * precond_diag_num_alloc, global_thread_idx, r2, r3);
  };
  LoadUnique<1, double, double>(diag, 0, (double*)inout_shared);
  if (global_thread_idx < problem_size) {
    ReadShared1<double>((double*)inout_shared, 0, r4);
  };
  __syncthreads();
  if (global_thread_idx < problem_size) {
    r5 = 1.00000000000000000e+00;
    r5 = r4 + r5;
    r6 = 1.00000000000000008e-15;
    r6 = r4 * r6;
    r2 = fma(r2, r5, r6);
    r2 = 1.0 / r2;
    r2 = r0 * r2;
    r5 = fma(r3, r5, r6);
    r5 = 1.0 / r5;
    r5 = r1 * r5;
    WriteIdx2<1024, double, double, double2>(out_normalized,
                                             0 * out_normalized_num_alloc,
                                             global_thread_idx,
                                             r2,
                                             r5);
  };
}

void PinholeFocalNormalize(double* precond_diag,
                           unsigned int precond_diag_num_alloc,
                           double* precond_tril,
                           unsigned int precond_tril_num_alloc,
                           double* njtr,
                           unsigned int njtr_num_alloc,
                           const double* const diag,
                           double* out_normalized,
                           unsigned int out_normalized_num_alloc,
                           size_t problem_size) {
  if (problem_size == 0) {
    return;
  }

  const int n_blocks = (problem_size + 1024 - 1) / 1024;
  PinholeFocalNormalizeKernel<<<n_blocks, 1024>>>(precond_diag,
                                                  precond_diag_num_alloc,
                                                  precond_tril,
                                                  precond_tril_num_alloc,
                                                  njtr,
                                                  njtr_num_alloc,
                                                  diag,
                                                  out_normalized,
                                                  out_normalized_num_alloc,
                                                  problem_size);
}

}  // namespace caspar