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limitations.md

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Limitations

Unimplemented features

The following is a (probably incomplete) list of features that are not yet implemented in hipSYCL

  • hierarchical parallel for: flexible work group ranges are unsupported (hierarchical dispatch with ranges fixed at parallel_for_work_group invocation is supported).
  • hierarchical parallel for: Within work group scope execution may not be limited to only one work item per group.
  • hierarchical parallel for: Initializing variables in work group scope may not work correctly
  • Some builtins are unimplemented, e.g. sycl::native functions
  • Images
  • vec<> class lacks convert(), as(), swizzled temporary vector objects lack operators
  • Error handling: wait_and_throw() and throw_asynchronous() do not invoke async handler
  • 0-dimensional objects (e.g 0D accessors) are mostly unimplemented
  • SYCL 1.2.1: Because hipSYCL is not based on OpenCL, all SYCL OpenCL interoperability features are unimplemented.

Other limitations

  • If the SYCL namespace is fully opened with a using namespace cl::sycl statement, name collisions may occur since the SYCL spec requires the existence of SYCL vector types such as float4 in the SYCL namespace with the same name as CUDA/HIP vector types which live in the global namespace.