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使用英特尔 OneAPI beta6 的以下玩具代码。

#include <CL/sycl.hpp>
#include <iostream>

namespace sycl = cl::sycl;

const int SIZE=1;

class Increment_accessor {
  public:
    Increment_accessor(sycl::accessor<int, 1, sycl::access::mode::read_write, sycl::access::target::global_buffer> ptr_) : ptr {ptr_} {}
    void operator()(sycl::item<1> item) {
      ptr[item.get_linear_id()]++;
    }
  private:
    sycl::accessor<int, 1, sycl::access::mode::read_write, sycl::access::target::global_buffer> ptr;
};

class Increment_pointer {
  public:
    Increment_pointer(sycl::global_ptr<int> ptr_) : ptr {ptr_} {} 
    void operator()(sycl::item<1> item) {
      ptr[item.get_linear_id()]++;
    }
  private:
    sycl::global_ptr<int> ptr;
};

int 
main(int argc, char *argv[])
{
  sycl::device dev = sycl::default_selector().select_device();
  sycl::queue q(dev);
  int hbuffer[SIZE] = {};

  {
    sycl::buffer<int, 1> …