DPCT1088

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 11/07/2023

Version

Public

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DPCT1088

Message

The macro definition has multiple migration results in the dimension of free queries function that could not be unified. You may need to modify the code.

Detailed Help

Intel® DPC++ Compatibility Tool was unable to migrate the code correctly. You need to modify the code manually.

For example, this original CUDA* code:

  #define TB(x) cg::thread_block x = cg::this_thread_block()

  __global__ void kernel1() {
    int id = threadIdx.x;
    TB(a);
  }
  __global__ void kernel3() {
    int id = threadIdx.z;
    TB(b);
  }

migrated with options --assume-nd-range-dim=1 and --use-experimental-features=free-function-queries, results in the following migrated SYCL code:

  #define TB(x) auto x = sycl::this_group< Placeholder /* Fix the dimension manually */>()
  // It should be this_group<1>() when used in kernel1 and this_group<3>() when used in kernel3

  void kernel1() {
    int id = sycl::this_nd_item<1>().get_local_id(0);
    TB(a);
  }
  void kernel3() {
    int id = sycl::this_nd_item<3>().get_local_id(0);
    TB(b);
  }

which is manually adjusted to:

  #define TB(x, dimensions) auto x = sycl::this_group< dimensions >()

  void kernel1() {
    int id = sycl::this_nd_item<1>().get_local_id(0);
    TB(a, 1);
  }
  void kernel3() {
    int id = sycl::this_nd_item<3>().get_local_id(0);
    TB(b, 3);
  }

Suggestions to Fix

Rewrite the code manually.

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1088

Message

Detailed Help

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