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Request for additional attribute sub_group_sizes #975

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@fcharras

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@fcharras

This issue is a follow-up on #894 which have already added nice attributes to sycl devices and kernels.

This attribute sub_group_sizes is listed in the array of device attribute descriptors of the SYCL spec but it's not an attribute of SyclDevice (while e.g max_work_group_size or max_num_sub_groups).

In the meantime I wonder if max_work_group_size // max_num_sub_groups is supposed to be always equal to "min(sub_group_sizes)" ?

Also I understand that max_sub_group_size can't be implemented because it needs actions in libsycl, is there a follow up issue on this ?

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