---
id: pr-cccl-cub-6007
repo: NVIDIA/cccl
pr: 6007
title: Use just SYNCS unit to wait on cuda::barrier on SM90+
author: bernhardmgruber
date: '2025-10-16'
url: https://github.com/NVIDIA/cccl/pull/6007
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- sm100
- sm90
techniques: []
hardware_features:
- blackwell
- hopper
kernel_types: []
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 0658406bc885876279fef76efa5913cc73a140fd
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- libcudacxx/include/cuda/__barrier/barrier_block_scope.h
artifact_dir: evidence/pull-bundles/cccl-cub/gh-6007
head_ref_oid: 3d0b0a509edf349d5fcc656b4453a882e4244ce9
---
# Use just SYNCS unit to wait on cuda::barrier on SM90+

- Repository: `NVIDIA/cccl`
- PR: [6007](https://github.com/NVIDIA/cccl/pull/6007)
- 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/__barrier/barrier_block_scope.h`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-6007`
