DPCT1017

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 7/13/2023

Version

Public

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DPCT1017

Message

The <SYCL API name> call is used instead of the <CUDA API name> call. These two calls do not provide exactly the same functionality. Check the potential precision and/or performance issues for the generated code.

Detailed Help

Intel® DPC++ Compatibility Tool did not find an exact functional equivalent of the function in SYCL*, so it used the closest alternative. The replacement may impact your code precision and/or performance. Verify the code correctness/performance.

Suggestions to Fix

Verify the code correctness/performance.

For example, this original CUDA* code:

__global__ void k(float *out, float *in) {
  *out = normf(3, in);
}

results in the following migrated SYCL code:

void k(float *out, float *in) {
  /*
  DPCT1017:0: The dpct::length call is used instead of the normf call. These two
  calls do not provide exactly the same functionality. Check the potential
  precision and/or performance issues for the generated code.
  */
  *out = dpct::length(in, 3);
}

which is rewritten to:

#include <sycl/ext/intel/math.hpp>
void k(float *out, float *in) {
  /*
  If the extension API sycl::ext::intel::math::norm is available, the following
  line can alternately be migrated to *out = sycl::ext::intel::math::norm(3, in);
  */
  *out = dpct::length(in, 3);
}

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1017

Message

Detailed Help

Suggestions to Fix