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OpenCL 2.1 adds several new high-level features.
OpenCL 2.1 is backwards compatible with previous versions of OpenCL. This version of OpenCL is supported on all Valhall GPUs and Bifrost GPUs from Mali™‑G76.
New features include:
Support for Intermediate Language (IL) programs.
Device and host timer.
For detailed information about OpenCL 2.1, see the Khronos specification: https://www.khronos.org/registry/OpenCL/specs/opencl-2.1.pdf.