---
id: pr-cccl-cub-8008
repo: NVIDIA/cccl
pr: 8008
title: Make warpspeed scan tunable
author: bernhardmgruber
date: '2026-03-13'
url: https://github.com/NVIDIA/cccl/pull/8008
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: 1f93d9303a61ced0b403e8115a7d1d91b26f1487
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/benchmarks/bench/scan/exclusive/base.cuh
- cub/benchmarks/bench/scan/exclusive/custom.cu
- cub/benchmarks/bench/scan/exclusive/sum.cu
- cub/benchmarks/bench/scan/exclusive/sum.warpspeed.cu
- cub/cub/device/dispatch/tuning/tuning_scan.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8008
head_ref_oid: 2dee3c412aacdc8d2c1aebd704fd31c2eb772dce
---
# Make warpspeed scan tunable

- Repository: `NVIDIA/cccl`
- PR: [8008](https://github.com/NVIDIA/cccl/pull/8008)
- 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/benchmarks/bench/scan/exclusive/base.cuh`
- `cub/benchmarks/bench/scan/exclusive/custom.cu`
- `cub/benchmarks/bench/scan/exclusive/sum.cu`
- `cub/benchmarks/bench/scan/exclusive/sum.warpspeed.cu`
- `cub/cub/device/dispatch/tuning/tuning_scan.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8008`
