DPCT1112

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 3/22/2024

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Public

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DPCT1112

Message

If the filter mode is set to linear, the behavior of image “read” may be different from tex1Dfetch in the original code. You may need to adjust the code.

Detailed Help

The CUDA* tex1Dfetch function always applies the nearest filtering mode. In the migrated code, the image read function applies the filtering mode that is set for the texture object. There may be a different result on the image read, so you may need to align the filter mode on image read.

Suggestions to Fix

For example, this original CUDA code:

  cudaTextureDesc desc;
  desc.filterMode = cudaFilterModeLinear;
  ...
  cudaTextureObject_t obj;
  cudaCreateTextureObject(&obj, ..., &desc, ...);
  ...
  tex1Dfetch(..., obj, ...);

results in the following migrated SYCL* code:

  dpct::sampling_info desc;
  desc.set(sycl::filtering_mode::linear);
  ...
  dpct::image_wrapper_base_p obj;
  obj = dpct::create_image_wrapper(..., desc);
  ...
  /*
  DPCT1112:0: If the filter mode is set to 'linear', the behavior of image
  "read" may be different from "tex1Dfetch" in the original code. You may need
  to adjust the code.
  */
  obj.read(...);

which is rewritten to:

  dpct::sampling_info desc;
  desc.set(sycl::filtering_mode::nearest);  // Update the filtering mode from linear to nearest
  ...
  dpct::image_wrapper_base_p obj;
  obj = dpct::create_image_wrapper(..., desc);
  ...

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1112

Message

Detailed Help

Suggestions to Fix