get_sub_group_size

Returns the number of work-items in the subgroup.

uint get_sub_group_size ()

Description

Returns the number of work-items in the subgroup. This value is no more than the maximum subgroup size and is implementation-defined based on a combination of the compiled kernel and the dispatch dimensions. This will be a constant value for the lifetime of the subgroup.

Specification

OpenCL Specification

Also see

cl_khr_subgroups

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