DPCT1059

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 12/16/2022

Version

Public

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DPCT1059

Message

SYCL only supports 4-channel image format. Adjust the code.

Detailed Help

SYCL* supports only 4-channel image format. The warning is emitted, when the tool generates code with unsupported image format, which corresponds to the original code. You can fix the resulting code by changing the image format. Note: suggested workaround may impact code performance.

For example, the following migrated DPC++ code:

// migrated DPC++ code, which is using unsupported image format:

dpct::image_wrapper<cl::sycl::uint2, 2> tex; // 2-channel image is not supported

void test_image(dpct::image_accessor_ext<cl::sycl::uint2, 2> acc) {
  cl::sycl::uint2 tex_data;
  tex_data = acc.read(0, 0);
}
int main() {
  ... dpct::get_default_queue().submit([&](cl::sycl::handler &cgh) {
    ... auto acc = tex.get_access(cgh);
    auto smpl = tex.get_sampler();
    ... cgh.single_task<class dpct_single_kernel>([=] {
      test_image(dpct::image_accessor_ext<cl::sycl::uint2, 2>(smpl, acc));
    });
  });
  ...
}

is manually adjusted to:

// manually adjusted code:

dpct::image_wrapper<cl::sycl::uint4, 2> tex;

void test_image(dpct::image_accessor_ext<cl::sycl::uint4, 2> acc) {
  cl::sycl::uint4 tex_data;
  tex_data = acc.read(0, 0);
}
int main() {
  ... dpct::get_default_queue().submit([&](cl::sycl::handler &cgh) {
    ... auto acc = tex.get_access(cgh);
    auto smpl = tex.get_sampler();
    ... cgh.single_task<class dpct_single_kernel>([=] {
      test_image(dpct::image_accessor_ext<cl::sycl::uint4, 2>(smpl, acc));
    });
  });
  ...
}

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1059

Message

Detailed Help

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