---
id: pr-cccl-cub-5414
repo: NVIDIA/cccl
pr: 5414
title: Move TMA barrier in DeviceTransform into dynamic SMEM
author: bernhardmgruber
date: '2025-08-07'
url: https://github.com/NVIDIA/cccl/pull/5414
source_category: upstream-code
architectures:
- sm90
tags:
- hopper
techniques:
- async-copy
hardware_features:
- hopper
- tma
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 9ae8d23eff7805fe5976710e1dc97e63909ec7e9
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/cub/device/dispatch/dispatch_transform.cuh
- cub/cub/device/dispatch/kernels/transform.cuh
- cub/cub/device/dispatch/tuning/tuning_transform.cuh
- cub/test/catch2_test_device_transform.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-5414
head_ref_oid: 7edb9a738c4b017b6a4c701d19686b57790e14f6
---
# Move TMA barrier in DeviceTransform into dynamic SMEM

- Repository: `NVIDIA/cccl`
- PR: [5414](https://github.com/NVIDIA/cccl/pull/5414)
- 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/dispatch_transform.cuh`
- `cub/cub/device/dispatch/kernels/transform.cuh`
- `cub/cub/device/dispatch/tuning/tuning_transform.cuh`
- `cub/test/catch2_test_device_transform.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-5414`
