---
id: pr-flash-attention-2014
repo: Dao-AILab/flash-attention
pr: 2014
title: '[Cute,Sm100,Fwd] use correction warps for epi when not using TMA'
author: jayhshah
date: '2025-11-19'
url: https://github.com/Dao-AILab/flash-attention/pull/2014
source_category: upstream-code
architectures:
- sm100
tags:
- arch_pipeline
- compiler_runtime
- paged
- tma
techniques:
- async-copy
- epilogue-fusion
- pipeline-stages
- warp-specialization
hardware_features:
- blackwell
- tma
kernel_types:
- compiler
- runtime
languages:
- cute-dsl
captured_at: '2026-05-16'
status: merged
merge_sha: 43375aab2893018dfb7950db1cfa623c14946ad6
inclusion_reason: 'Extract the architecture assumption first: SM target, TMA/WGMMA/tcgen path, cluster use, and pipeline stages.'
changed_paths:
- flash_attn/cute/block_sparse_utils.py
- flash_attn/cute/flash_fwd_sm100.py
- flash_attn/cute/interface.py
- tests/cute/test_flash_attn.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-2014
head_ref_oid: 89f2f6ca664ea3118cb50308ad6dc54b403c0cae
---
# [Cute,Sm100,Fwd] use correction warps for epi when not using TMA

- Repository: `Dao-AILab/flash-attention`
- PR: [2014](https://github.com/Dao-AILab/flash-attention/pull/2014)
- Decision: `Extract the architecture assumption first: SM target, TMA/WGMMA/tcgen path, cluster use, and pipeline stages.`
- Reason: Extract the architecture assumption first: SM target, TMA/WGMMA/tcgen path, cluster use, and pipeline stages.

## Changed Paths

- `flash_attn/cute/block_sparse_utils.py`
- `flash_attn/cute/flash_fwd_sm100.py`
- `flash_attn/cute/interface.py`
- `tests/cute/test_flash_attn.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-2014`
