---
id: pr-cccl-cub-8529
repo: NVIDIA/cccl
pr: 8529
title: Prefer the term warpspeed over lookahead
author: bernhardmgruber
date: '2026-04-20'
url: https://github.com/NVIDIA/cccl/pull/8529
source_category: upstream-code
architectures:
- sm100
tags:
- reduction
- scan
- warp
techniques:
- warp-specialization
hardware_features: []
kernel_types:
- reduction
- scan
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 3644ee1b2e1f876abf1454ec3424711aa4cae75d
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- c/parallel/src/scan.cu
- cub/cub/device/dispatch/dispatch_scan.cuh
- cub/cub/device/dispatch/kernels/kernel_scan.cuh
- cub/cub/device/dispatch/kernels/kernel_scan_warpspeed.cuh
- cub/test/catch2_test_device_scan.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8529
head_ref_oid: 7a346903c6ac4c33c1a7e1dcd2d121036f4e072e
---
# Prefer the term warpspeed over lookahead

- Repository: `NVIDIA/cccl`
- PR: [8529](https://github.com/NVIDIA/cccl/pull/8529)
- 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/scan.cu`
- `cub/cub/device/dispatch/dispatch_scan.cuh`
- `cub/cub/device/dispatch/kernels/kernel_scan.cuh`
- `cub/cub/device/dispatch/kernels/kernel_scan_warpspeed.cuh`
- `cub/test/catch2_test_device_scan.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8529`
