---
id: pr-cccl-cub-8803
repo: NVIDIA/cccl
pr: 8803
title: Fix DeviceTransform byte-offset overflow when num_items*sizeof(T) > 4Gb
author: gonidelis
date: '2026-05-05'
url: https://github.com/NVIDIA/cccl/pull/8803
source_category: upstream-code
architectures:
- sm100
tags:
- benchmark kernel
- blackwell
techniques: []
hardware_features:
- blackwell
kernel_types: []
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: b5a61f5324bc4d7247b087f7ac38de2db8c1f11c
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cub/cub/device/dispatch/kernels/kernel_transform.cuh
- cub/test/catch2_test_device_transform.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8803
head_ref_oid: 48411c4df9d8e5bd2079acc73e183be7f1fdc73e
---
# Fix DeviceTransform byte-offset overflow when num_items*sizeof(T) > 4Gb

- Repository: `NVIDIA/cccl`
- PR: [8803](https://github.com/NVIDIA/cccl/pull/8803)
- 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/kernel_transform.cuh`
- `cub/test/catch2_test_device_transform.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8803`
