---
id: pr-flash-attention-1856
repo: Dao-AILab/flash-attention
pr: 1856
title: '[BugFix] fix flash_fwd.FlashAttentionForwardSm80  bugs'
author: mingyangHao
date: '2025-09-02'
url: https://github.com/Dao-AILab/flash-attention/pull/1856
source_category: upstream-code
architectures:
- sm100
tags:
- sm80
techniques: []
hardware_features: []
kernel_types:
- attention
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 27b64c7c9b25a4d279b2a42257dd936a8dd2dc23
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- flash_attn/cute/flash_fwd.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-1856
head_ref_oid: 6853593a5193c2a148c0989ffb2c17aba5bcaaa1
---
# [BugFix] fix flash_fwd.FlashAttentionForwardSm80  bugs

- Repository: `Dao-AILab/flash-attention`
- PR: [1856](https://github.com/Dao-AILab/flash-attention/pull/1856)
- 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_fwd.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-1856`
