---
id: pr-cccl-cub-8254
repo: NVIDIA/cccl
pr: 8254
title: 'Recover `warp_shuffle` original behavior (revert #8210)'
author: fbusato
date: '2026-04-07'
url: https://github.com/NVIDIA/cccl/pull/8254
source_category: upstream-code
architectures:
- sm100
tags:
- warp
techniques:
- warp-specialization
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: e55abfbf963418618935474275792d25187d54da
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- libcudacxx/include/cuda/__warp/warp_shuffle.h
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8254
head_ref_oid: 47ccd21120291a1f2a57077b58334233abf68f65
---
# Recover `warp_shuffle` original behavior (revert #8210)

- Repository: `NVIDIA/cccl`
- PR: [8254](https://github.com/NVIDIA/cccl/pull/8254)
- 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

- `libcudacxx/include/cuda/__warp/warp_shuffle.h`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8254`
