---
id: pr-cccl-cub-5122
repo: NVIDIA/cccl
pr: 5122
title: Try, fail and ignore to guarantee dynamic SMEM alignment on Hopper
author: bernhardmgruber
date: '2025-07-04'
url: https://github.com/NVIDIA/cccl/pull/5122
source_category: upstream-code
architectures:
- sm90
tags:
- hopper
techniques: []
hardware_features:
- hopper
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: df0a0987841a04998d0a020bd23278ac6a55c6d0
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/cub/device/dispatch/kernels/transform.cuh
artifact_dir: evidence/pull-bundles/cccl-cub/gh-5122
head_ref_oid: ce7cc73df10dcdbede50918ab1a2d4762420d7e4
---
# Try, fail and ignore to guarantee dynamic SMEM alignment on Hopper

- Repository: `NVIDIA/cccl`
- PR: [5122](https://github.com/NVIDIA/cccl/pull/5122)
- 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

- `cub/cub/device/dispatch/kernels/transform.cuh`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-5122`
