[SYCL][Graph] Refine barrier semantics #14363
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Changes the semantics of [sycl_ext_oneapi_enqueue_barrier](https://github.com/intel/llvm/blob/sycl/sycl/doc/extensions/supported/sycl_ext_oneapi_enqueue_barrier.asciidoc) commands recorded from a queue into a SYCL-Graph. The current semantics are that a barrier without a wait-list will depend on all leaf nodes in the graph, and be a dependency of any subsequent node added to the graph. After discussion with users, this change updates the behavior of barriers to only depend on leaf nodes from the same recording queue, and only commands recorded from the same queue will have a dependency on the barrier.
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fabiomestre
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@intel/llvm-gatekeepers This is ready to merge, thanks |
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Changes the semantics of sycl_ext_oneapi_enqueue_barrier commands recorded from a queue into a SYCL-Graph.
The current semantics are that a barrier without a wait-list will depend on all leaf nodes in the graph, and be a dependency of any subsequent node added to the graph.
After discussion with users, this change updates the behavior of barriers to only depend on leaf nodes from the same recording queue, and only commands recorded from the same queue will have a dependency on the barrier.