---
id: pr-cccl-cub-6666
repo: NVIDIA/cccl
pr: 6666
title: Migrate cuco HLL
author: srinivasyadav18
date: '2026-01-28'
url: https://github.com/NVIDIA/cccl/pull/6666
source_category: upstream-code
architectures:
- sm90
tags:
- cooperative-groups
- hopper
techniques: []
hardware_features:
- hopper
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 9cf04b66a02604ac36ffcf2231ce0e0cc55871ed
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cudax/include/cuda/experimental/__cuco/__hash_functions/murmurhash3.cuh
- cudax/include/cuda/experimental/__cuco/__hash_functions/utils.cuh
- cudax/include/cuda/experimental/__cuco/__hash_functions/xxhash.cuh
- cudax/include/cuda/experimental/__cuco/__hyperloglog/finalizer.cuh
- cudax/include/cuda/experimental/__cuco/__hyperloglog/hyperloglog_impl.cuh
- cudax/include/cuda/experimental/__cuco/__hyperloglog/kernels.cuh
- cudax/include/cuda/experimental/__cuco/__hyperloglog/tuning.cuh
- cudax/include/cuda/experimental/__cuco/__utility/strong_type.cuh
- cudax/include/cuda/experimental/__cuco/hash_functions.cuh
- cudax/include/cuda/experimental/__cuco/hyperloglog.cuh
- cudax/include/cuda/experimental/__cuco/hyperloglog_ref.cuh
- cudax/test/CMakeLists.txt
- cudax/test/cuco/hyperloglog/test_hyperloglog.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-6666
head_ref_oid: 19a25c405ba426111083353494cdc51c23aabd0a
---
# Migrate cuco HLL

- Repository: `NVIDIA/cccl`
- PR: [6666](https://github.com/NVIDIA/cccl/pull/6666)
- 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

- `cudax/include/cuda/experimental/__cuco/__hash_functions/murmurhash3.cuh`
- `cudax/include/cuda/experimental/__cuco/__hash_functions/utils.cuh`
- `cudax/include/cuda/experimental/__cuco/__hash_functions/xxhash.cuh`
- `cudax/include/cuda/experimental/__cuco/__hyperloglog/finalizer.cuh`
- `cudax/include/cuda/experimental/__cuco/__hyperloglog/hyperloglog_impl.cuh`
- `cudax/include/cuda/experimental/__cuco/__hyperloglog/kernels.cuh`
- `cudax/include/cuda/experimental/__cuco/__hyperloglog/tuning.cuh`
- `cudax/include/cuda/experimental/__cuco/__utility/strong_type.cuh`
- `cudax/include/cuda/experimental/__cuco/hash_functions.cuh`
- `cudax/include/cuda/experimental/__cuco/hyperloglog.cuh`
- `cudax/include/cuda/experimental/__cuco/hyperloglog_ref.cuh`
- `cudax/test/CMakeLists.txt`
- `cudax/test/cuco/hyperloglog/test_hyperloglog.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-6666`
