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This patch introduces libsycl, a SYCL runtime library implementation, as a top-level LLVM runtime project. SYCL spec: https://registry.khronos.org/SYCL/specs/sycl-2020/html/sycl-2020.html Commit contains the basic folder layout and CMake infrastructure to build a dummy SYCL library. This is part of the SYCL support upstreaming effort. The relevant RFCs can be found here: https://discourse.llvm.org/t/rfc-add-full-support-for-the-sycl-programming-model/74080 https://discourse.llvm.org/t/rfc-sycl-runtime-upstreaming/74479 Upcoming PRs: - UR offloading library fetch & build - partial implementation of sycl::platform: requires offloading layer, requires classes for backend loading & enumeration. --------- Signed-off-by: Tikhomirova, Kseniya <kseniya.tikhomirova@intel.com> Co-authored-by: Alexey Bader <alexey.bader@intel.com>
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