DPCT1083

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 6/24/2024

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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[];
    ...
  }

  void foo() {
    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 = (sycl::float3 *)dpct_local;
    ...
  }

  void foo() {
    /*
    DPCT1083:0: The size of local memory in the migrated code may be different
    from the original code. Check that the allocated memory size in the migrated
    code is correct.
    */
    size_t shared_size = 3 * sizeof(float);
    dpct::get_in_order_queue().submit([&](sycl::handler &cgh) {
      sycl::local_accessor<uint8_t, 1> dpct_local_acc_ct1(
          sycl::range<1>(shared_size), cgh);

      cgh.parallel_for(
          sycl::nd_range<3>(sycl::range<3>(1, 1, 1), sycl::range<3>(1, 1, 1)),
          [=](sycl::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 = (sycl::float3 *)dpct_local;
    ...
  }

  void foo() {
    size_t shared_size = 1 * sizeof(sycl::float3);
    dpct::get_in_order_queue().submit([&](sycl::handler &cgh) {
      sycl::local_accessor<uint8_t, 1> dpct_local_acc_ct1(
          sycl::range<1>(shared_size), cgh);

      cgh.parallel_for(
          sycl::nd_range<3>(sycl::range<3>(1, 1, 1), sycl::range<3>(1, 1, 1)),
          [=](sycl::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