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// MIT License
//
// Modifications Copyright (C) 2025 Advanced Micro Devices, Inc. All rights reserved.
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//
// UNSUPPORTED: libcpp-has-no-threads, pre-sm-60
// UNSUPPORTED: windows && pre-sm-70
// UNSUPPORTED: nvrtc
// UNSUPPORTED: hiprtc

// <cuda/atomic>

#define _LIBCUDACXX_FORCE_PTX_AUTOMATIC_STORAGE_PATH 1 // Force using the PTX is_local atomics path

#include <cuda/atomic>
#include <cuda/std/cassert>
#include <cuda/std/type_traits>

#include "test_macros.h"

/*
Test goals:
Pre-load registers with values that will be used to trigger the wrong codepath in local device atomics.

This test is architecture and driver dependent. It is not possible to reproduce this when compiled to SASS on 12.0, but
will repro on 12.8.

Compiled to SASS is an important point, compiling to PTX will show the failure to initialize the local test flag for
isspacep.local to 0, but that might be compiled out by the JIT compiler in the driver
*/

#define SIZE 1024

__global__ void __launch_bounds__(SIZE) device_test(char* gmem)
{
  constexpr int threads = SIZE;

  __shared__ int hidx;
  __shared__ int histogram[threads];

  cuda::atomic<int, cuda::thread_scope_thread> xatom(0);

#if defined(__GFX8__) || defined(__GFX9__)
  constexpr int passes   = 8;
  constexpr int ops      = 64;
#else
  constexpr int passes   = 16;
  constexpr int ops      = 32;
#endif

  // check that gmem access does not go out of scope.
  assert(8 * (passes - 1) + ops < SIZE);

  constexpr int expected = passes * ops;

  if (threadIdx.x == 0)
  {
    hidx = 0;
    memset(histogram, 0, sizeof(histogram));
  }

  __syncthreads();

  for (xatom = 0; xatom.load() < passes; xatom++)
  {
    using A = cuda::atomic_ref<int, cuda::std::thread_scope_block>;
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 0]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 1]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 2]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 3]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 4]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 5]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 6]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 7]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 8]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 9]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 10]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 11]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 12]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 13]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 14]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 15]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 16]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 17]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 18]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 19]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 20]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 21]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 22]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 23]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 24]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 25]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 26]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 27]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 28]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 29]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 30]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 31]);
#if defined(__GFX8__) || defined(__GFX9__)
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 0]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 1]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 2]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 3]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 4]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 5]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 6]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 7]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 8]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 9]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 10]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 11]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 12]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 13]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 14]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 15]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 16]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 17]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 18]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 19]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 20]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 21]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 22]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 23]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 24]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 25]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 26]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 27]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 28]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 29]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 30]);
    A(histogram[A(hidx).fetch_add(1) % threads]).fetch_add(gmem[(xatom.load() * 8) + 32 + 31]);
#endif
  }

  __syncthreads();

  if (histogram[threadIdx.x] != expected)
  {
    printf("[%i] = %i\r\n", threadIdx.x, histogram[threadIdx.x]);
  }
  assert(histogram[threadIdx.x] == expected);
}

void launch_kernel()
{
  cudaError_t err;
  char* inptr = nullptr;
  CUDA_CALL(err, cudaGetLastError());
  CUDA_CALL(err, cudaMalloc(&inptr, SIZE));
  CUDA_CALL(err, cudaMemset(inptr, 1, SIZE));
  device_test<<<1, SIZE>>>(inptr);
  CUDA_CALL(err, cudaGetLastError());
  CUDA_CALL(err, cudaDeviceSynchronize());
}

int main(int arg, char** argv)
{
  NV_IF_TARGET(NV_IS_HOST, (launch_kernel();))
  return 0;
}