---
id: pr-cccl-cub-8222
repo: NVIDIA/cccl
pr: 8222
title: Small warpspeed scan improvements
author: bernhardmgruber
date: '2026-03-31'
url: https://github.com/NVIDIA/cccl/pull/8222
source_category: upstream-code
architectures:
- sm100
tags:
- scan
techniques:
- warp-specialization
hardware_features: []
kernel_types:
- scan
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 265d52ca2ca59485e93ed7fff9f8fd3be49c55c3
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/cub/device/dispatch/dispatch_scan.cuh
- thrust/testing/scan.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8222
head_ref_oid: 79213ad6242cb89057d1dfe86d8aac98f2d585f3
---
# Small warpspeed scan improvements

- Repository: `NVIDIA/cccl`
- PR: [8222](https://github.com/NVIDIA/cccl/pull/8222)
- 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_scan.cuh`
- `thrust/testing/scan.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8222`
