DPCT1013

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 7/13/2023

Version

Public

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DPCT1013

Message

The rounding mode could not be specified and the generated code may have different accuracy than the original code. Verify the correctness. SYCL math built-in function rounding mode is aligned with OpenCL C 1.2 standard.

Detailed Help

The rounding mode could not be specified and the generated code may have different accuracy than the original code. Verify the correctness. The SYCL* math built-in functions rounding mode is aligned with the OpenCL C 1.2 standard.

Suggestions to Fix

Review the logic and adjust it.

For example, this original CUDA* code:

__global__ void foo(double *res) {
  double a = 1.00001;
  double b = 100000000000000000;
  *res = __dadd_ru(a, b);
}

results in the following migrated SYCL code:

void foo(double *res) {
  double a = 1.00001;
  double b = 100000000000000000;
  /*
  DPCT1013:0: The rounding mode could not be specified and the generated code
  may have different accuracy than the original code. Verify the correctness.
  SYCL math built-in function rounding mode is aligned with OpenCL C 1.2
  standard.
  */
  *res = a + b;
}

which is rewritten to:

void foo(double *res) {
  double a = 1.00001;
  double b = 100000000000000000;
  *res = a + b; // For precision, use: *res = sycl::nextafter(a + b, (double)INFINITY);

}

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1013

Message

Detailed Help

Suggestions to Fix