---
id: pr-cccl-cub-7795
repo: NVIDIA/cccl
pr: 7795
title: Add env SegmentedReduce (non fixed-size overloads)
author: gonidelis
date: '2026-03-25'
url: https://github.com/NVIDIA/cccl/pull/7795
source_category: upstream-code
architectures:
- sm100
tags:
- benchmark_test
- memory_primitives
- policy tuning
- segmented reduce
techniques: []
hardware_features: []
kernel_types:
- memory
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 81d4be29e84f3e000678ed404f835bcba4437c8f
inclusion_reason: 'Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.'
changed_paths:
- cub/cub/device/device_segmented_reduce.cuh
- cub/test/catch2_test_device_segmented_reduce_env.cu
- cub/test/catch2_test_device_segmented_reduce_env_api.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-7795
head_ref_oid: 81312a678a8bc621a062ad73135f0180f7584915
---
# Add env SegmentedReduce (non fixed-size overloads)

- Repository: `NVIDIA/cccl`
- PR: [7795](https://github.com/NVIDIA/cccl/pull/7795)
- Decision: `Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.`
- Reason: Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.

## Changed Paths

- `cub/cub/device/device_segmented_reduce.cuh`
- `cub/test/catch2_test_device_segmented_reduce_env.cu`
- `cub/test/catch2_test_device_segmented_reduce_env_api.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-7795`
