---
id: pr-cccl-cub-8839
repo: NVIDIA/cccl
pr: 8839
title: Fix Warpspeed scan shifted output store
author: bdice
date: '2026-05-06'
url: https://github.com/NVIDIA/cccl/pull/8839
source_category: upstream-code
architectures:
- sm100
tags:
- CUB
- arch_pipeline
- benchmark_test
- memory_primitives
- reduce
- scan
- warpspeed scan
techniques:
- pipeline-stages
- warp-specialization
hardware_features: []
kernel_types:
- memory
- runtime
- scan
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 69d3293e1ebbd4aff44a9453491965633937591c
inclusion_reason: 'Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.'
changed_paths:
- cub/cub/detail/warpspeed/squad/load_store.cuh
- cub/test/test_device_scan_warpspeed_shifted_output.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8839
head_ref_oid: 40d0d38e788416211825f86c58d178fcfff0cb66
---
# Fix Warpspeed scan shifted output store

- Repository: `NVIDIA/cccl`
- PR: [8839](https://github.com/NVIDIA/cccl/pull/8839)
- 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/detail/warpspeed/squad/load_store.cuh`
- `cub/test/test_device_scan_warpspeed_shifted_output.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8839`
