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       async_work_group_copy - Perform an async copy.

       event_t async_work_group_copy(__local gentype *dst, const __global gentype *src,
                                     size_t num_gentypes, event_t event);

       event_t async_work_group_copy(__global gentype *dst, const __local gentype *src,
                                     size_t num_gentypes, event_t event);


       The OpenCL C programming language implements these functions that provide asynchronous
       copies between global and local memory and a prefetch from global memory.

       Perform an async copy of num_gentypes elements from src to dst. The async copy is
       performed by all work-items in a work-group and this built-in function must therefore be
       encountered by all work-items in a work-group executing the kernel with the same argument
       values; otherwise the results are undefined.

       Returns an event object that can be used by wait_group_events(3clc) to wait for the async
       copy to finish. The event argument can also be used to associate the async_work_group_copy
       with a previous async copy allowing an event to be shared by multiple async copies;
       otherwise event should be zero.

       If event argument is non-zero, the event object supplied in event argument will be

       This function does not perform any implicit synchronization of source data such as using a
       barrier(3clc) before performing the copy.


       The generic type name gentype indicates the built-in data types char, char{2|3|4|8|16},
       uchar, uchar{2|3|4|8|16}, short, short{2|3|4|8|16}, ushort, ushort{2|3|4|8|16}, int,
       int{2|3|4|8|16}, uint, uint{2|3|4|8|16}, long, long{2|3|4|8|16}, ulong, ulong{2|3|4|8|16}
       or float, float{2|3|4|8|16} as the type for the arguments unless otherwise stated.

       Optionally, generic type name gentype may indicate double and double{2|3|4|8|16} as
       arguments and return values. If extended with cl_khr_fp16(3clc), generic type name gentype
       may indicate half and half{2|3|4|8|16} as arguments and return values.

       async_work_group_copy and async_work_group_strided_copy for 3-component vector types
       behave as async_work_group_copy and async_work_group_strided_copy respectively for
       4-component vector types.


       OpenCL Specification[1]


       asyncCopyFunctions(3clc), wait_group_events(3clc)


       The Khronos Group


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        1. OpenCL Specification
           page 276, section 6.12.10 - Async Copies from Global to Local Memory...