DPCT1070

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 6/24/2024

Version

Public

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DPCT1070

Message

<pointer variable name> is allocated by dpct::dpct_malloc. Use dpct::get_host_ptr<type>(pointer variable name) to access the pointer from the host code.

Detailed Help

The memory referenced by this pointer is allocated by dpct::dpct_malloc and cannot be directly accessed from the host code. You can access the memory from the host code by transforming the pointer using the dpct::get_host_ptr function.

Suggestions to Fix

Re-migrate the code without specifing --usm-level=none; or
Review the code and adjust it manually.

For example, this original CUDA* code:

void bar(float *a) {
  a[0] = 1;
}

void foo() {
  float* a;
  cudaMallocManaged(&a, 10 * sizeof(float));
  bar(a);
}

results in the following migrated SYCL* code:

#define DPCT_USM_LEVEL_NONE
#include <sycl/sycl.hpp>
#include <dpct/dpct.hpp>
void bar(float *a) {
  a[0] = 1;
}

void foo() {
  float* a;
  /*
  DPCT1070:0: 'a' is allocated by dpct::dpct_malloc. Use
  dpct::get_host_ptr<float>(a) to access the pointer from the host code.
  */
  a = (float *)dpct::dpct_malloc(10 * sizeof(float));
  bar(a);
}

which is rewritten to:

#define DPCT_USM_LEVEL_NONE
#include <sycl/sycl.hpp>
#include <dpct/dpct.hpp>
void bar(float *a) {
  dpct::get_host_ptr<float>(a)[0] = 1;
}

void foo() {
  float* a;
  a = (float *)dpct::dpct_malloc(10 * sizeof(float));
  bar(a);
}

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1070

Message

Detailed Help

Suggestions to Fix