async_work_group_strided_copy
Performs an async gather of num_elements gentype elements from source to destination.
Description
async_work_group_strided_copy performs 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. This rule applies to
ND-ranges implemented with uniform and
non-uniform work-groups.
Returns an event object that can be used by
wait_group_events
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 returned.
This function does not perform any implicit synchronization of source data such as using a barrier 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}, float, float{2|3|4|8|16}, or double, double{2|3|4|8|16} as the type for the arguments unless otherwise stated.
When extended by the
cl_khr_fp16 extension,
the generic type gentypen is extended to
include half, half2, half3, half4,
half8, and half16.
Notes
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.
Copyright © 2007-2013 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials.