Provided by: opencl-1.2-man-doc_1.0~svn33624-1_all bug


       async_work_group_strided_copy - Performs an async gather of num_elements gentype elements
       from source to destination.

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

       event_t async_work_group_strided_copy(__global gentype *dst, const __local gentype *src,
                                             size_t num_gentypes, size_t dst_stride,
                                             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 gather of num_gentypes gentype elements from src to dst. The src_stride
       is the stride in elements for each gentype element read from src. The dst_stride is the
       stride in elements for each gentype element written to dst. The async gather is performed
       by all work-items in a work-group.

       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_strided_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 behavior of async_work_group_strided_copy is undefined if src_stride or dst_stride is
       0, or if the src_stride or dst_stride values cause the src or dst pointers to exceed the
       upper bounds of the address space during 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


       Copyright © 2007-2011 The Khronos Group Inc.
       Permission is hereby granted, free of charge, to any person obtaining a copy of this
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        1. OpenCL Specification
           page 276, section 6.12.10 - Async Copies from Global to Local Memory...