---
id: pr-cccl-cub-4618
repo: NVIDIA/cccl
pr: 4618
title: Pass `cached_segment` by `span`
author: miscco
date: '2025-05-02'
url: https://github.com/NVIDIA/cccl/pull/4618
source_category: upstream-code
architectures:
- sm100
tags:
- reduction
techniques:
- cache-policy
hardware_features: []
kernel_types:
- reduction
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 8a4b9450aceef2e96bd5525be335f053701d8338
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/cub/block/block_radix_rank.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-4618
head_ref_oid: 447b40894d06a7ffb45c68667355825576f32959
---
# Pass `cached_segment` by `span`

- Repository: `NVIDIA/cccl`
- PR: [4618](https://github.com/NVIDIA/cccl/pull/4618)
- 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/block/block_radix_rank.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-4618`
