DPCT1041

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 11/07/2023

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Public

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DPCT1041

Message

SYCL uses exceptions to report errors, it does not use error codes. 0 is used instead of an error code in <statement name> statement. You may need to rewrite this code.

Detailed Help

SYCL* uses exceptions to report errors, it does not use error codes. The original code tries to get an error code, but SYCL does not require this functionality. Therefore, 0 is used instead of an error code in the following statements:

if
while
do
for
switch
return
function-like macro

Suggestions to Fix

You may need to rewrite this code.

For example, this original CUDA* code:

 void foo() {
   ...
   int N;
   cublasHandle_t handle;
   float alpha, beta;
   float *a, *b, *c;
   if (int status = cublasSgemm(handle, CUBLAS_OP_N, CUBLAS_OP_N, N, N, N, &alpha,
                              a, N, b, N, &beta, c, N)) {
     printf("cublasSgemm failed\n");
   }
   ...
 }

results in the following migrated SYCL code:

 void foo() try {
   ...
   int N;
   dpct::queue_ptr handle;
   float alpha, beta;
   float *a, *b, *c;
   {
     auto a_buf_ct1 = dpct::get_buffer<float>(a);
     auto b_buf_ct2 = dpct::get_buffer<float>(b);
     auto c_buf_ct3 = dpct::get_buffer<float>(c);
     oneapi::mkl::blas::column_major::gemm(
         *handle, oneapi::mkl::transpose::nontrans,
         oneapi::mkl::transpose::nontrans, N, N, N, alpha, a_buf_ct1, N,
         b_buf_ct2, N, beta, c_buf_ct3, N);
   }
   /*
   DPCT1041:0: SYCL uses exceptions to report errors, it does not use error
   codes. 0 is used instead of an error code in an if statement. You may need to
   rewrite this code.
   */
   if (int status = 0) {
     printf("cublasSgemm failed\n");
   }
   ...
 }
 catch (sycl::exception const &exc) {
   std::cerr << exc.what() << "Exception caught at file:" << __FILE__
             << ", line:" << __LINE__ << std::endl;
   std::exit(1);
 }

which is rewritten to:

 void foo() try {
   ...
   int N;
   dpct::queue_ptr handle;
   float alpha, beta;
   float *a, *b, *c;
   {
     auto a_buf_ct1 = dpct::get_buffer<float>(a);
     auto b_buf_ct2 = dpct::get_buffer<float>(b);
     auto c_buf_ct3 = dpct::get_buffer<float>(c);
     oneapi::mkl::blas::column_major::gemm(
         *handle, oneapi::mkl::transpose::nontrans,
         oneapi::mkl::transpose::nontrans, N, N, N, alpha, a_buf_ct1, N,
         b_buf_ct2, N, beta, c_buf_ct3, N);
   }
   ...
 }
 catch (sycl::exception const &exc) {
   std::cerr << exc.what() << "Exception caught at file:" << __FILE__
             << ", line:" << __LINE__ << std::endl;
   std::exit(1);
 }

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1041

Message

Detailed Help

Suggestions to Fix