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an open standard for cross-platform, task-based as well as data-based parallel programming of CPUs, [[GPU|GPUs]], [[FPGA|FPGAs]], [https://en.wikipedia.org/wiki/Digital_signal_processor DSPs], including the [[C|C99]] based programming languageOpenCL C. OpenCL C forbids [[Recursion|recursion]], and omits [https://en.wikipedia.org/wiki/Function_pointer function pointers], [https://en.wikipedia.org/wiki/Bit_field bit fields] and [https://en.wikipedia.org/wiki/Variable-length_array variable-length] [[Array|arrays]], but has fixed-length vector types, supporting [[SIMD and SWAR Techniques|SIMD instructions]] if available on the target platforms. OpenCL 2.0 adds features like nested parallelism and shared virtual memory, version 2.1 extends OpenCL C to a subset of C++14. OpenCL 3.0 makes version 1.2 functionality a mandatory baseline with 2.x and 3.x as optional features and replaces 'OpenCL C++' with 'C++ for OpenCL' as a subset of C++17. OpenCL is maintained by the [https://en.wikipedia.org/wiki/Nonprofit_organization nonprofit] technology consortium [https://en.wikipedia.org/wiki/Khronos_Group Khronos Group], adopted by [[Apple]]<ref>[https://appleinsider.com/articles/18/06/04/opengl-opencl-deprecated-in-favor-of-metal-2-in-macos-1014-mojave OpenGL, OpenCL deprecated in favor of Metal 2 in macOS 10.14 Mojave]</ref>, [[Intel]], [https://en.wikipedia.org/wiki/Qualcomm Qualcomm], [[AMD]], [[Nvidia]], [https://en.wikipedia.org/wiki/Altera Altera], [https://en.wikipedia.org/wiki/Samsung Samsung], [https://en.wikipedia.org/wiki/Vivante_Corporation Vivante], [https://en.wikipedia.org/wiki/Imagination_Technologies Imagination Technologies] and [[ARM]].