DPCT1083

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 7/13/2023

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Public

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DPCT1083

Message

The size of <placeholder> in the migrated code may be different from the original code. Check that the allocated memory size in the migrated code is correct.

Detailed Help

Some types have a different size in the migrated code than in the original code, for example sycl::float3 compared to float3. Check if the allocated size of memory is correct in the migrated code.

In the example below, 3*sizeof(float) is used to represent the size of float3 in the original code. In the migrated code the size of sycl::float3 is different, so the allocated size needs adjustment.

For example, this original CUDA* code:

  _global_ void kernel() {   extern __shared__ float3 shared_memory[]; }

  int main()
  {   size_t shared_size = 3 * sizeof(float);   kernel<<<1, 1, shared_size>>>();  ... }

results in the following migrated SYCL* code:

  void kernel(uint8_t *dpct_local)
  {   auto shared_memory = (float3 *)dpct_local; }
  int main() {
    /*
    DPCT1083
    */
    size_t shared_size = 3 * sizeof(float);
    get_default_queue().submit([&](handler &cgh) {
      accessor<...> dpct_local_acc_ct1(range<1>(shared_size), cgh);
      cgh.parallel_for(...,
          [=](nd_item<3> item_ct1) {
          kernel(dpct_local_acc_ct1.get_pointer());         });
    });
    ...
  }

which is manually adjusted to:

  void kernel(uint8_t *dpct_local) {   auto shared_memory = (float3 *)dpct_local; }

  int main() {
    size_t shared_size = 1 * sizeof(float3);
    get_default_queue().submit([&](handler &cgh)
      Unknown macro: {
        accessor<...> dpct_local_acc_ct1(range<1>(shared_size), cgh);    cgh.parallel_for(...,        [=](nd_item<3> item_ct1) {
          kernel(dpct_local_acc_ct1.get_pointer());
        });
      }
    );
    ...
  }

Suggestions to Fix

Check the allocated size of memory and replace it with the correct size if necessary.

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1083

Message

Detailed Help

Suggestions to Fix