---
id: pr-cccl-cub-6921
repo: NVIDIA/cccl
pr: 6921
title: Use vectorized transform kernel for sizeof(T) < 4 workloads of arity >1 on Hopper
author: bernhardmgruber
date: '2025-12-10'
url: https://github.com/NVIDIA/cccl/pull/6921
source_category: upstream-code
architectures:
- sm90
tags:
- hopper
techniques:
- vectorized-loads
hardware_features:
- hopper
kernel_types: []
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 04e095592cee1513e042e5878079d1f95682b957
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-6921
head_ref_oid: 3ee8c26084fcdcad88930af1248428d53626c5e4
---
# Use vectorized transform kernel for sizeof(T) < 4 workloads of arity >1 on Hopper

- Repository: `NVIDIA/cccl`
- PR: [6921](https://github.com/NVIDIA/cccl/pull/6921)
- 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-6921`
