---
id: pr-cccl-cub-8223
repo: NVIDIA/cccl
pr: 8223
title: Don't specify `__launch_bounds__` together with  `__block_size__`
author: davebayer
date: '2026-03-31'
url: https://github.com/NVIDIA/cccl/pull/8223
source_category: upstream-code
architectures:
- sm100
tags:
- block
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: b1479ef8233a4b30eee2f1d50c8f8738c3e55aa4
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- libcudacxx/include/cuda/__launch/launch.h
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8223
head_ref_oid: 9c1e679d515da99331a836fa4b3ab05bd2168298
---
# Don't specify `__launch_bounds__` together with  `__block_size__`

- Repository: `NVIDIA/cccl`
- PR: [8223](https://github.com/NVIDIA/cccl/pull/8223)
- 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

- `libcudacxx/include/cuda/__launch/launch.h`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8223`
