C++ (Cpp) vector_slice::stride Examples

Example #1

File: vector_proxy.hpp Project: GnsP/viennacl-dev

  void copy(vector_slice<vector<SCALARTYPE> > const & gpu_vector_slice,
            VectorType & cpu_vector)
  {
    assert(gpu_vector_slice.end() - gpu_vector_slice.begin() >= 0 && bool("Range must have nonnegative length!"));

    if (gpu_vector_slice.end() - gpu_vector_slice.begin() > 0)
    {
      std::vector<SCALARTYPE> temp_buffer(gpu_vector_slice.stride() * gpu_vector_slice.size());
      viennacl::backend::memory_read(gpu_vector_slice.handle(), sizeof(SCALARTYPE)*gpu_vector_slice.start(), sizeof(SCALARTYPE)*temp_buffer.size(), &(temp_buffer[0]));

      for (vcl_size_t i=0; i<cpu_vector.size(); ++i)
        cpu_vector[i] = temp_buffer[i * gpu_vector_slice.stride()];
    }
  }

Example #2

File: vector_proxy.hpp Project: GnsP/viennacl-dev

  void copy(const VectorType & cpu_vector,
            vector_slice<vector<SCALARTYPE> > & gpu_vector_slice )
  {
    if (cpu_vector.size() > 0)
    {
      std::vector<SCALARTYPE> temp_buffer(gpu_vector_slice.stride() * gpu_vector_slice.size());

      viennacl::backend::memory_read(gpu_vector_slice.handle(), sizeof(SCALARTYPE)*gpu_vector_slice.start(), sizeof(SCALARTYPE)*temp_buffer.size(), &(temp_buffer[0]));

      for (vcl_size_t i=0; i<cpu_vector.size(); ++i)
        temp_buffer[i * gpu_vector_slice.stride()] = cpu_vector[i];

      viennacl::backend::memory_write(gpu_vector_slice.handle(), sizeof(SCALARTYPE)*gpu_vector_slice.start(), sizeof(SCALARTYPE)*temp_buffer.size(), &(temp_buffer[0]));
    }
  }

Example #3

File: vector_proxy.hpp Project: andiselinger/viennacl-dev

 vector_slice(vector_slice<VectorType> const & v, slice const & entry_slice)
   : base_type(const_cast<handle_type &>(v.handle()),
               entry_slice.size(), v.start() + v.stride() * entry_slice.start(), entry_slice.stride() * v.stride()) {}