---
id: pr-cccl-cub-8342
repo: NVIDIA/cccl
pr: 8342
title: Make warpspeed scan tunable
author: bernhardmgruber
date: '2026-04-16'
url: https://github.com/NVIDIA/cccl/pull/8342
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: 268547452bad568a7c8785943ed702bd6a36fe42
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- benchmarks/scripts/cccl/bench/bench.py
- cub/benchmarks/bench/scan/exclusive/base.cuh
- cub/benchmarks/bench/scan/policy_selector.h
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8342
head_ref_oid: e76addccbdba766a986f2ce645d73376fa8863b2
---
# Make warpspeed scan tunable

- Repository: `NVIDIA/cccl`
- PR: [8342](https://github.com/NVIDIA/cccl/pull/8342)
- 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

- `benchmarks/scripts/cccl/bench/bench.py`
- `cub/benchmarks/bench/scan/exclusive/base.cuh`
- `cub/benchmarks/bench/scan/policy_selector.h`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8342`
