---
id: pr-cccl-cub-5408
repo: NVIDIA/cccl
pr: 5408
title: 'Combine `block_reduce_warp_reduction_nondeterministic.cuh` specialization with original deterministic one '
author: NaderAlAwar
date: '2025-08-04'
url: https://github.com/NVIDIA/cccl/pull/5408
source_category: upstream-code
architectures:
- sm100
tags:
- arch_pipeline
- block reduce
- memory_primitives
- warp reduce
techniques:
- pipeline-stages
- warp-specialization
hardware_features: []
kernel_types:
- memory
- reduction
- runtime
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: bdd277705fa31411fc4ddfbae64dd1d42d0fa1d5
inclusion_reason: 'Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.'
changed_paths:
- cub/cub/block/block_reduce.cuh
- cub/cub/block/specializations/block_reduce_warp_reductions.cuh
- cub/cub/block/specializations/block_reduce_warp_reductions_nondeterministic.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-5408
head_ref_oid: 8ef5f0146b809eeff299d352eadc12a0752204ab
---
# Combine `block_reduce_warp_reduction_nondeterministic.cuh` specialization with original deterministic one 

- Repository: `NVIDIA/cccl`
- PR: [5408](https://github.com/NVIDIA/cccl/pull/5408)
- 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/block/block_reduce.cuh`
- `cub/cub/block/specializations/block_reduce_warp_reductions.cuh`
- `cub/cub/block/specializations/block_reduce_warp_reductions_nondeterministic.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-5408`
