---
id: pr-cccl-cub-3565
repo: NVIDIA/cccl
pr: 3565
title: 'Backport to 2.8: Tune cub::DeviceTransform for Blackwell (#3543)'
author: bernhardmgruber
date: '2025-01-31'
url: https://github.com/NVIDIA/cccl/pull/3565
source_category: upstream-code
architectures:
- sm100
tags:
- blackwell
techniques: []
hardware_features:
- blackwell
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 264869a751b2d6eb4c709c585f4211ca86806667
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/cub/device/dispatch/tuning/tuning_transform.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-3565
head_ref_oid: 9f027413e4c84f58e79ce3fdb25f864c799e90eb
---
# Backport to 2.8: Tune cub::DeviceTransform for Blackwell (#3543)

- Repository: `NVIDIA/cccl`
- PR: [3565](https://github.com/NVIDIA/cccl/pull/3565)
- 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/tuning/tuning_transform.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-3565`
