project_6/cccl_upstream/thrust/testing/cuda/transform_reduce.cu

#include <thrust/execution_policy.h>
#include <thrust/transform_reduce.h>

#include <unittest/unittest.h>

#ifdef THRUST_TEST_DEVICE_SIDE
template <typename ExecutionPolicy, typename Iterator1, typename Function1, typename T, typename Function2, typename Iterator2>
__global__ void transform_reduce_kernel(
  ExecutionPolicy exec, Iterator1 first, Iterator1 last, Function1 f1, T init, Function2 f2, Iterator2 result)
{
  *result = thrust::transform_reduce(exec, first, last, f1, init, f2);
}

template <typename ExecutionPolicy>
void TestTransformReduceDevice(ExecutionPolicy exec)
{
  using Vector = thrust::device_vector<int>;
  using T      = typename Vector::value_type;

  Vector data{1, -2, 3};
  T init = 10;

  thrust::device_vector<T> result(1);

  transform_reduce_kernel<<<1, 1>>>(
    exec, data.begin(), data.end(), ::cuda::std::negate<T>(), init, ::cuda::std::plus<T>(), result.begin());
  cudaError_t const err = cudaDeviceSynchronize();
  ASSERT_EQUAL(cudaSuccess, err);

  ASSERT_EQUAL(8, (T) result[0]);
}

void TestTransformReduceDeviceSeq()
{
  TestTransformReduceDevice(thrust::seq);
}
DECLARE_UNITTEST(TestTransformReduceDeviceSeq);

void TestTransformReduceDeviceDevice()
{
  TestTransformReduceDevice(thrust::device);
}
DECLARE_UNITTEST(TestTransformReduceDeviceDevice);
#endif

void TestTransformReduceCudaStreams()
{
  using Vector = thrust::device_vector<int>;
  using T      = Vector::value_type;

  Vector data{1, -2, 3};
  T init = 10;

  cudaStream_t s;
  cudaStreamCreate(&s);

  T result = thrust::transform_reduce(
    thrust::cuda::par.on(s), data.begin(), data.end(), ::cuda::std::negate<T>(), init, ::cuda::std::plus<T>());
  cudaStreamSynchronize(s);

  ASSERT_EQUAL(8, result);

  cudaStreamDestroy(s);
}
DECLARE_UNITTEST(TestTransformReduceCudaStreams);