---
id: pr-cccl-cub-5061
repo: NVIDIA/cccl
pr: 5061
title: Replace CG by TMA copy in bulk copy fallback path
author: bernhardmgruber
date: '2025-06-26'
url: https://github.com/NVIDIA/cccl/pull/5061
source_category: upstream-code
architectures:
- sm90
tags:
- cooperative-groups
- hopper
techniques:
- async-copy
hardware_features:
- hopper
- tma
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 20b66fa08fe2235f11c0d3b2f84af2cb6a1e9985
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/cub/device/dispatch/kernels/transform.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-5061
head_ref_oid: 922de51f90d665bf42a0e450a114304ddc641be2
---
# Replace CG by TMA copy in bulk copy fallback path

- Repository: `NVIDIA/cccl`
- PR: [5061](https://github.com/NVIDIA/cccl/pull/5061)
- 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`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-5061`
