DPCT1000

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 3/22/2024

Version

Public

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Visible to Intel only — GUID: GUID-41B83F12-8B72-46EF-99A1-D873EADFED6B

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DPCT1000

Message

Error handling if-stmt was detected but could not be rewritten.

Detailed Help

This warning is generated when Intel® DPC++ Compatibility Tool detects more complex error handling than it considers safe to remove.

The CUDA* API returns error codes that are consumed by the program logic. SYCL* uses exceptions to report errors and does not return the error code.

When the error handling logic in the original code is simple (for example, a print error message and exit), the code is removed in the resulting Data Parallel C++ (DPC++) application. The expectation is that SYCL throws an exception, which is handled with the printing of an exception message and exiting (the exception handler is generated automatically by Intel® DPC++ Compatibility Tool).

Suggestions to Fix

Review the error handling if- statement and try to rewrite it to use an exception handler instead.

For example, this original CUDA code:

void check_err(cudaError_t err, float **f) {
  if (err != cudaSuccess) {
   log_error();
  }
}

void foo() {
  float *f;
  cudaError_t err = cudaMalloc(&f, 4);
  check_err(err, &f);
}

results in the following migrated SYCL code:

void check_err(int err, float **f) {
  /*
  DPCT1000:1: Error handling if-stmt was detected but could not be rewritten.
  */
  if (err != 0) {
    /*
    DPCT1001:0: The statement could not be removed.
    */
    log_error();
  }
}

void foo() {
  float *f;
  ...
  int err = (f = (float *)sycl::malloc_device(4, dpct::get_default_queue()), 0);
  check_err(err, &f);
}

which is rewritten to:

void foo() {
  float *f;
  try {
   f = (float *)sycl::malloc_device(4, dpct::get_default_queue());
  } catch (sycl::exception const &e) {
    log_error();
  }
}

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DPCT1000

Message

Detailed Help

Suggestions to Fix