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       get_global_size - Returns the number of global work-items specified for dimension
       identified by dimindx.

       size_t get_global_size(uint dimindx);


       This value is given by the global_work_size argument to clEnqueueNDRangeKernel(3clc).
       Valid values of dimindx are 0 to get_work_dim(3clc)() - 1. For other values of dimindx,
       get_global_size() returns 1.

       For clEnqueueTask(3clc), this always returns 1.


       OpenCL Specification[1]


       workItemFunctions(3clc), clEnqueueNDRangeKernel(3clc), clEnqueueTask(3clc)


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        1. OpenCL Specification
           page 242, section 6.12.1 - Work-Item Functions