DPCT1081

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 6/24/2024

Version

Public

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DPCT1081

Message

The generated code assumes that <pointer variable> points to the global memory address space. If it points to a local or private memory address space, replace address_space::global with address_space::local or address_space::private.

Detailed Help

Intel® DPC++ Compatibility Tool tries to deduce the address space of the memory that <pointer variable> points to. If the tool cannot deduce the address space (for example, the pointer variable is used by multiple functions), the tool will use address_space::global and the warning will be emitted.

Suggestions to Fix

Check the address space of the memory that <pointer variable> points to and replace address_space::global with the correct address space.

For example, this original CUDA* code:

__device__ void bar1(double *out1, double *d) {
  double i = 30;
  double &d2 = *d;
  sincos(i, out1, &d2);
}

__global__ void kernel(double *out1, double *out2) {
  double d;
  bar1(out1, &d);
  *out2 = d;
}

results in the following migrated SYCL code:

void bar1(double *out1, double *d) {
  double i = 30;
  double &d2 = *d;
  /*
  DPCT1081:0: The generated code assumes that "&d2" points to the global memory
  address space. If it points to a local or private memory address space,
  replace "address_space::global" with "address_space::local" or
  "address_space::private".
  */
  *out1 = sycl::sincos(
      i, sycl::address_space_cast<sycl::access::address_space::global_space,
                                  sycl::access::decorated::yes, double>(&d2));
}

void kernel(double *out1, double *out2) {
  double d;
  bar1(out1, &d);
  *out2 = d;
}

which is rewritten to:

void bar1(double *out1, double *d) {
  double i = 30;
  double &d2 = *d;
  *out1 = sycl::sincos(
      i, sycl::address_space_cast<sycl::access::address_space::private_space,
                                  sycl::access::decorated::yes, double>(&d2));
}

void kernel(double *out1, double *out2) {
  double d;
  bar1(out1, &d);
  *out2 = d;
}

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1081

Message

Detailed Help

Suggestions to Fix