DPCT1056

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 11/07/2023

Version

Public

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DPCT1056

Message

The use of <variable name> in device code was not detected. If this variable is also used in device code, you need to rewrite the code.

Detailed Help

If __constant__ variable is only used in host code, “__constant__” attribute will be removed.

Suggestions to Fix

For example, this original CUDA* code:

#include <stdio.h>
#include <cuda_runtime.h>

static __constant__ const float const_a = 10.f;

void foo_host() {
  printf("%f\n", const_a);
}

is migrated using the following migration command:

dpct --out-root out test.h --extra-arg=-xc

which results in the following migrated SYCL* code:

/*
DPCT1056:0: The use of const_a in device code was not detected. If this variable is
also used in device code, you need to rewrite the code.
*/
static const float const_a = 10.f;

void foo_host() {
  printf("%f\n", const_a);
}

If the variable “const_a” is only used in host code, just ignore the DPCT1056 warning. For example:

static const float const_a = 10.f;

void foo_host() {
  printf("%f\n", const_a);
}

If the variable “const_a” is used in both host and device code, rewrite the migrated code. For example:

static const float const_a_host_ct1 = 10.f;
static dpct::constant_memory<const float, 0> const_a(10.f);

void foo_host() {
  printf("%f\n", const_a_host_ct1);
}

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1056

Message

Detailed Help

Suggestions to Fix