---
id: pr-cccl-cub-7245
repo: NVIDIA/cccl
pr: 7245
title: Fix `is_address_from` for `cluster_shared` for pre-sm_90
author: davebayer
date: '2026-01-20'
url: https://github.com/NVIDIA/cccl/pull/7245
source_category: upstream-code
architectures:
- sm90
tags:
- sm90
techniques: []
hardware_features:
- hopper
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 7b00476ee01190483533e0e03dac908da2f8b85f
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- libcudacxx/include/cuda/__memory/address_space.h
- libcudacxx/test/libcudacxx/cuda/memory/address_space.pass.cpp
artifact_dir: evidence/pull-bundles/cccl-cub/gh-7245
head_ref_oid: a828060f6dfb5632df8df07c177a3cee3425fad5
---
# Fix `is_address_from` for `cluster_shared` for pre-sm_90

- Repository: `NVIDIA/cccl`
- PR: [7245](https://github.com/NVIDIA/cccl/pull/7245)
- 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/__memory/address_space.h`
- `libcudacxx/test/libcudacxx/cuda/memory/address_space.pass.cpp`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-7245`
