cub/device/device_memcpy.cuh

File members: cub/device/device_memcpy.cuh

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 *     * Redistributions of source code must retain the above copyright
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
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#pragma once

#include <cub/config.cuh>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#include <cub/detail/nvtx.cuh>
#include <cub/device/dispatch/dispatch_batch_memcpy.cuh>

#include <cstdint>
#include <type_traits>

CUB_NAMESPACE_BEGIN

struct DeviceMemcpy
{
  template <typename InputBufferIt, typename OutputBufferIt, typename BufferSizeIteratorT>
  CUB_RUNTIME_FUNCTION static cudaError_t Batched(
    void* d_temp_storage,
    size_t& temp_storage_bytes,
    InputBufferIt input_buffer_it,
    OutputBufferIt output_buffer_it,
    BufferSizeIteratorT buffer_sizes,
    uint32_t num_buffers,
    cudaStream_t stream = 0)
  {
    CUB_DETAIL_NVTX_RANGE_SCOPE_IF(d_temp_storage, "cub::DeviceMemcpy::Batched");
    static_assert(std::is_pointer<cub::detail::value_t<InputBufferIt>>::value,
                  "DeviceMemcpy::Batched only supports copying of memory buffers."
                  "Please consider using DeviceCopy::Batched instead.");
    static_assert(std::is_pointer<cub::detail::value_t<OutputBufferIt>>::value,
                  "DeviceMemcpy::Batched only supports copying of memory buffers."
                  "Please consider using DeviceCopy::Batched instead.");

    // Integer type large enough to hold any offset in [0, num_buffers)
    using BufferOffsetT = uint32_t;

    // Integer type large enough to hold any offset in [0, num_thread_blocks_launched), where a safe
    // uppper bound on num_thread_blocks_launched can be assumed to be given by
    // IDIV_CEIL(num_buffers, 64)
    using BlockOffsetT = uint32_t;

    return detail::DispatchBatchMemcpy<
      InputBufferIt,
      OutputBufferIt,
      BufferSizeIteratorT,
      BufferOffsetT,
      BlockOffsetT,
      detail::DeviceBatchMemcpyPolicy<BufferOffsetT, BlockOffsetT>,
      true>::Dispatch(d_temp_storage,
                      temp_storage_bytes,
                      input_buffer_it,
                      output_buffer_it,
                      buffer_sizes,
                      num_buffers,
                      stream);
  }
};

CUB_NAMESPACE_END