---
id: pr-cccl-cub-7933
repo: NVIDIA/cccl
pr: 7933
title: Improve this hierarchy groups
author: davebayer
date: '2026-03-13'
url: https://github.com/NVIDIA/cccl/pull/7933
source_category: upstream-code
architectures:
- sm100
tags:
- cooperative-groups
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: f3ffc3d495a84447729127895d2768fdd22efb2b
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cudax/include/cuda/experimental/__hierarchy/fwd.cuh
- cudax/include/cuda/experimental/__hierarchy/implicit_hierarchy.cuh
- cudax/include/cuda/experimental/__hierarchy/this_group.cuh
- cudax/include/cuda/experimental/hierarchy.cuh
- cudax/test/hierarchy/group.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-7933
head_ref_oid: cdf471912f6d14d57e80cb4a4ca2ce4fa664b4e6
---
# Improve this hierarchy groups

- Repository: `NVIDIA/cccl`
- PR: [7933](https://github.com/NVIDIA/cccl/pull/7933)
- 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/__hierarchy/fwd.cuh`
- `cudax/include/cuda/experimental/__hierarchy/implicit_hierarchy.cuh`
- `cudax/include/cuda/experimental/__hierarchy/this_group.cuh`
- `cudax/include/cuda/experimental/hierarchy.cuh`
- `cudax/test/hierarchy/group.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-7933`
