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Mojo function

block_rank_in_cluster

def block_rank_in_cluster() -> UInt32

Returns the unique identifier (rank) for the current thread block within its cluster.

Note:

• Only supported on NVIDIA SM90+ GPUs.
• Maps directly to the %cluster_ctarank special register in CUDA PTX.

Returns:

UInt32: A unique identifier in the range [0, cluster_size-1] where cluster_size is the total number of thread blocks in the cluster.