---
id: pr-cccl-cub-8857
repo: NVIDIA/cccl
pr: 8857
title: 'cudax: introduce HLL Policy template parameter'
author: sleeepyjack
date: '2026-05-13'
url: https://github.com/NVIDIA/cccl/pull/8857
source_category: upstream-code
architectures:
- sm100
tags:
- cuda kernel
techniques: []
hardware_features: []
kernel_types: []
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 5d79bc23cf9e116b5a9139e5bb85d6d8464a6836
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cudax/include/cuda/experimental/__cuco/__hyperloglog/default_policy.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/hll_policies.cuh
- cudax/include/cuda/experimental/__cuco/hyperloglog.cuh
- cudax/include/cuda/experimental/__cuco/hyperloglog_ref.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8857
head_ref_oid: 5aaed260c17ff0c04e98be7fc6a1c0ffddaf3dc1
---
# cudax: introduce HLL Policy template parameter

- Repository: `NVIDIA/cccl`
- PR: [8857](https://github.com/NVIDIA/cccl/pull/8857)
- 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/__hyperloglog/default_policy.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/hll_policies.cuh`
- `cudax/include/cuda/experimental/__cuco/hyperloglog.cuh`
- `cudax/include/cuda/experimental/__cuco/hyperloglog_ref.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8857`
