---
id: pr-cccl-cub-4000
repo: NVIDIA/cccl
pr: 4000
title: Drop CUB_MIN|MAX in warp_scan_shfl
author: bernhardmgruber
date: '2025-03-04'
url: https://github.com/NVIDIA/cccl/pull/4000
source_category: upstream-code
architectures:
- sm100
tags:
- sm100
techniques:
- warp-specialization
hardware_features:
- blackwell
kernel_types:
- scan
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 9ae006fcfff0bd77a9b8b525b6d2f2bc68f54311
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/cub/warp/specializations/warp_scan_shfl.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-4000
head_ref_oid: 224d2dca5c51f48ee574a980bf2a959cb1b0a30e
---
# Drop CUB_MIN|MAX in warp_scan_shfl

- Repository: `NVIDIA/cccl`
- PR: [4000](https://github.com/NVIDIA/cccl/pull/4000)
- 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/warp/specializations/warp_scan_shfl.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-4000`
