DPCT1062

Intel® DPC++ Compatibility Tool Developer Guide and Reference

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ID 768918

Date 10/31/2024

Version

Public

Visible to Intel only — GUID: GUID-5A6AC877-D146-45FD-B7C2-462A2595DA89

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DPCT1062

Message

SYCL Image doesn’t support normalized read mode.

Detailed Help

This warning is emitted when cudaReadModeNormalizedFloat is used as the third argument of texture in the original code. Since SYCL* Image doesn’t support normalized read mode, cudaReadModeNormalizedFloat will be ignored during migration.

It may cause errors in the resulting code, for example, redefinition of overloaded functions, if the overloaded functions are differentiated based on the texture type in the original code.

For example, this original CUDA* code:

__device__ void foo(const texture<char4, 2, cudaReadModeNormalizedFloat> tex) {
  float4 f = tex2D(tex, 0.5f, 0.5f);
}
__device__ void foo (const texture<char4, 2, cudaReadModeElementType> tex) {
  char4 c = tex2D(tex, 0.5f, 0.5f);
}

results in the following migrated SYCL code:

/*
DPCT1062:0: SYCL Image doesn't support normalized read mode.
*/
void foo(dpct::image_accessor_ext<sycl::char4, 2> tex) {
  sycl::float4 f = tex.read(0.5f, 0.5f);
}
void foo(dpct::image_accessor_ext<sycl::char4, 2> tex) {
  sycl::char4 c = tex.read(0.5f, 0.5f);
}

which is rewritten to:

void foo1(dpct::image_accessor_ext<sycl::char4, 2> tex) {
  sycl::char4 temp_c = tex.read(0.5f, 0.5f);
  sycl::float4 f{temp_c.x(), temp_c.y(), temp_c.z(), temp_c.w()};
  f = f / 255.f;
}
void foo2(dpct::image_accessor_ext<sycl::char4, 2> tex) {
  sycl::char4 c = tex.read(0.5f, 0.5f);
}

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DPCT1062

Message

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