---
id: pr-flash-attention-2270
repo: Dao-AILab/flash-attention
pr: 2270
title: '[Cute,Sm100,Bwd] Add hdim 192 hdimv 128 backward for sm100'
author: jayhshah
date: '2026-02-25'
url: https://github.com/Dao-AILab/flash-attention/pull/2270
source_category: upstream-code
architectures:
- sm100
tags:
- sm100
techniques: []
hardware_features:
- blackwell
kernel_types:
- attention
languages:
- cute-dsl
captured_at: '2026-05-16'
status: merged
merge_sha: 156137b153ceaf2d0b078a505804f3626f7b395a
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- flash_attn/cute/flash_bwd_postprocess.py
- flash_attn/cute/flash_bwd_preprocess.py
- flash_attn/cute/flash_bwd_sm100.py
- flash_attn/cute/interface.py
- flash_attn/cute/tile_scheduler.py
- tests/cute/test_flash_attn.py
- tests/cute/test_flash_attn_race_condition.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-2270
head_ref_oid: 89aa98d7b0b782cb2514ebf57aaaa9d70ed8412c
---
# [Cute,Sm100,Bwd] Add hdim 192 hdimv 128 backward for sm100

- Repository: `Dao-AILab/flash-attention`
- PR: [2270](https://github.com/Dao-AILab/flash-attention/pull/2270)
- 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

- `flash_attn/cute/flash_bwd_postprocess.py`
- `flash_attn/cute/flash_bwd_preprocess.py`
- `flash_attn/cute/flash_bwd_sm100.py`
- `flash_attn/cute/interface.py`
- `flash_attn/cute/tile_scheduler.py`
- `tests/cute/test_flash_attn.py`
- `tests/cute/test_flash_attn_race_condition.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-2270`
