Description
prefetch prefetches
num_gentypes * sizeof(gentype) bytes into
the global cache. The prefetch instruction is applied to a work-item in a work-group
and does not affect the functional behavior of the kernel.
The kernel must wait for the completion of all async copies using the
wait_group_events built-in function before
exiting; otherwise the behavior is undefined.
General information about async copy functions: 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.
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