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SYCL: Improve team_reduce implementation (kokkos#6562)
* SYCL: Improve team_reduce implementation * Manually unroll loop to propagate shuffle destinations at compile-time * Update step_width * Fix sign comparison warnings * Comment and choosing step_width=16 * KOKKOS_ASSERT that the subgroup range doesn't exceed 32 * Remove unattainable cases * Add a barrier guarding the reduction array upon exiting team_reduce * Update comment to better reflect intent of barrier --------- Co-authored-by: Christian Trott <crtrott@sandia.gov>
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