---
id: pr-cccl-cub-7603
repo: NVIDIA/cccl
pr: 7603
title: '[cudax] Implement _this_ hierarchy groups'
author: davebayer
date: '2026-02-13'
url: https://github.com/NVIDIA/cccl/pull/7603
source_category: upstream-code
architectures:
- sm100
tags:
- cooperative-groups
techniques: []
hardware_features: []
kernel_types: []
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: dbe518a494c8cffe45ffc71636f464dd5f55609b
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/grid_sync.cuh
- cudax/include/cuda/experimental/__hierarchy/group.cuh
- cudax/include/cuda/experimental/hierarchy.cuh
- cudax/test/CMakeLists.txt
- cudax/test/hierarchy/group.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-7603
head_ref_oid: 67625430da85bff3f3eb84bc693162dbceef4be2
---
# [cudax] Implement _this_ hierarchy groups

- Repository: `NVIDIA/cccl`
- PR: [7603](https://github.com/NVIDIA/cccl/pull/7603)
- 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/grid_sync.cuh`
- `cudax/include/cuda/experimental/__hierarchy/group.cuh`
- `cudax/include/cuda/experimental/hierarchy.cuh`
- `cudax/test/CMakeLists.txt`
- `cudax/test/hierarchy/group.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-7603`
