DPCT1083

Intel® DPC++ Compatibility Tool Developer Guide and Reference

Download PDF

ID 768918

Date 10/31/2024

Version

Public

Visible to Intel only — GUID: GUID-7C5C35F9-795D-4E7F-8898-E77E9F0EA7D3

View Details

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.

Select Your Language

Using Intel.com Search

Quick Links

Recent Searches

Advanced Search

Only search in

Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1083

Message

Detailed Help

Suggestions to Fix