These are not proper pointers, see: https://github.com/google/clspv/blob/master/docs/OpenCLCOnVulkan.md https://github.com/google/clspv/blob/master/docs/OpenCLC

These are not proper pointers, see: https://github.com/google/clspv/blob/master/docs/OpenCLCOnVulkan.md https://github.com/google/clspv/blob/master/docs/OpenCLCOnVu... > Pointers are an abstract type - they have no known compile-time size. Using a pointer type as the argument to the sizeof() operator will result in an undefined value. > Pointer-to-integer casts must not be used. > Integer-to-pointer casts must not be used. > Pointers must not be compared for equality or inequality The first one in that list is a quite big limitation, affecting a significant number of scenarios… (And yes, you cannot actually make a compliant OpenCL 1.2 implementation on top of Vulkan, Vulkan has too few features for that purpose)