---
id: pr-cccl-cub-6189
repo: NVIDIA/cccl
pr: 6189
title: '[CUB] Fix mask types in block_radix_rank.cuh'
author: Aminsed
date: '2025-12-10'
url: https://github.com/NVIDIA/cccl/pull/6189
source_category: upstream-code
architectures:
- sm90
tags:
- sm90
techniques: []
hardware_features:
- hopper
kernel_types: []
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 1183eb98fc7db6eb130dea89e9b75fe75baba5a0
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/cub/block/block_radix_rank.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-6189
head_ref_oid: 9e14536e84886e4134341470548d1b1a3174820a
---
# [CUB] Fix mask types in block_radix_rank.cuh

- Repository: `NVIDIA/cccl`
- PR: [6189](https://github.com/NVIDIA/cccl/pull/6189)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `cub/cub/block/block_radix_rank.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-6189`
