---
id: pr-cccl-cub-6362
repo: NVIDIA/cccl
pr: 6362
title: Use `cp_async_bulk(space_shared,...)` when available
author: bernhardmgruber
date: '2025-11-03'
url: https://github.com/NVIDIA/cccl/pull/6362
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- sm100
- sm90
techniques: []
hardware_features:
- blackwell
- hopper
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 5c41a285ec0b4f48cc2db246714ac40b8ad09d81
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/cub/device/dispatch/kernels/transform.cuh
- libcudacxx/include/cuda/__memcpy_async/cp_async_bulk_shared_global.h
- libcudacxx/include/cuda/__memcpy_async/memcpy_async_tx.h
artifact_dir: evidence/pull-bundles/cccl-cub/gh-6362
head_ref_oid: 4f16a9a833e2ffa9f7059ab3bc384161034059ab
---
# Use `cp_async_bulk(space_shared,...)` when available

- Repository: `NVIDIA/cccl`
- PR: [6362](https://github.com/NVIDIA/cccl/pull/6362)
- 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

- `cub/cub/device/dispatch/kernels/transform.cuh`
- `libcudacxx/include/cuda/__memcpy_async/cp_async_bulk_shared_global.h`
- `libcudacxx/include/cuda/__memcpy_async/memcpy_async_tx.h`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-6362`
