DPCT1060

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 11/07/2023

Version

Public

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DPCT1060

Message

SYCL range can only be a 1D, 2D, or 3D vector. Adjust the code.

Detailed Help

This warning is emitted when the number of dimensions of memory in the original code exceeds 3. Since SYCL* range supports only 1, 2 or 3 dimensions, the resulting code is not SYCL-compliant.

To fix the resulting code you can use the low-dimensional arrays to simulate high-dimensional arrays.

The following fix example demonstrates how to use a 3D array to simulate a 4D array.

For example, this original CUDA* code:

__constant__ int const_array[dimX][dimY][dimZ][dimW];

__global__ void kernel(int x, int y, int z, int w) {
  int a = const_array[x][y][z][w];
}

results in the following migrated SYCL code:

/*
DPCT1060:0: SYCL range can only be a 1D, 2D, or 3D vector. Adjust the code.
*/
static dpct::constant_memory<int, 4> const_array(dimX, dimY, dimZ, dimW);

void kernel(int x, int y, int z, int w,
            sycl::accessor<int, 4, sycl::access_mode::read, sycl::access::target::device> const_array) {
  int a = const_array[x][y][z][w];
}

which is rewritten to:

static dpct::constant_memory<int, 3> const_array(dimX, dimY, dimZ * dimW);

void kernel(int x, int y, int z, int w,
            sycl::accessor<int, 3, sycl::access_mode::read, sycl::access::target::device> const_array) {
  int a = const_array[x][y][w * dimZ + z];
}

Suggestions to Fix

You may need to rewrite this code.

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Intel® DPC++ Compatibility Tool Developer Guide and Reference

DPCT1060

Message

Detailed Help

Suggestions to Fix