---
id: pr-cccl-cub-8809
repo: NVIDIA/cccl
pr: 8809
title: Split off non-determin. reduce tuning
author: bernhardmgruber
date: '2026-05-07'
url: https://github.com/NVIDIA/cccl/pull/8809
source_category: upstream-code
architectures:
- sm100
tags:
- reduction
techniques: []
hardware_features: []
kernel_types:
- reduction
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: f79ba0f5eb2d309effdda40cecb21dfed01ac561
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- c/parallel/src/reduce.cu
- cub/benchmarks/bench/reduce/nondeterministic.cu
- cub/cub/device/device_reduce.cuh
- cub/cub/device/dispatch/dispatch_reduce.cuh
- cub/cub/device/dispatch/dispatch_reduce_nondeterministic.cuh
- cub/cub/device/dispatch/kernels/kernel_reduce.cuh
- cub/cub/device/dispatch/tuning/tuning_reduce.cuh
- cub/cub/device/dispatch/tuning/tuning_reduce_nondeterministic.cuh
- cub/test/catch2_test_device_reduce_env.cu
- cub/test/catch2_test_device_reduce_nondeterministic.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8809
head_ref_oid: 13a327855e9513538600f1b429f3d728a68e5473
---
# Split off non-determin. reduce tuning

- Repository: `NVIDIA/cccl`
- PR: [8809](https://github.com/NVIDIA/cccl/pull/8809)
- 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

- `c/parallel/src/reduce.cu`
- `cub/benchmarks/bench/reduce/nondeterministic.cu`
- `cub/cub/device/device_reduce.cuh`
- `cub/cub/device/dispatch/dispatch_reduce.cuh`
- `cub/cub/device/dispatch/dispatch_reduce_nondeterministic.cuh`
- `cub/cub/device/dispatch/kernels/kernel_reduce.cuh`
- `cub/cub/device/dispatch/tuning/tuning_reduce.cuh`
- `cub/cub/device/dispatch/tuning/tuning_reduce_nondeterministic.cuh`
- `cub/test/catch2_test_device_reduce_env.cu`
- `cub/test/catch2_test_device_reduce_nondeterministic.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8809`
