---
id: pr-tilelang-2134
repo: tile-ai/tilelang
pr: 2134
title: 'fix: TMA alignment to 1024 bytes on Blackwell'
author: kasper0406
date: '2026-05-03'
url: https://github.com/tile-ai/tilelang/pull/2134
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- blackwell
- cuda kernel
- hopper
- matmul
techniques:
- async-copy
hardware_features:
- blackwell
- hopper
- tma
kernel_types:
- gemm
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: d135bd1cd2d2eee74fbb41dd0a0831a427194c86
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- src/transform/merge_shared_memory_allocations.cc
- testing/python/issue/test_tilelang_issue_sm120_tma_smem_alignment.py
artifact_dir: evidence/pull-bundles/tilelang/gh-2134
head_ref_oid: 45b656e835fb515e357573894028988027015661
---
# fix: TMA alignment to 1024 bytes on Blackwell

- Repository: `tile-ai/tilelang`
- PR: [2134](https://github.com/tile-ai/tilelang/pull/2134)
- 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

- `src/transform/merge_shared_memory_allocations.cc`
- `testing/python/issue/test_tilelang_issue_sm120_tma_smem_alignment.py`

## Evidence Bundle

`evidence/pull-bundles/tilelang/gh-2134`
