---
id: pr-flash-attention-1180
repo: Dao-AILab/flash-attention
pr: 1180
title: Add ArchTag to pre/postprocess bwd kernels
author: cameronshinn
date: '2024-08-28'
url: https://github.com/Dao-AILab/flash-attention/pull/1180
source_category: upstream-code
architectures:
- sm100
tags:
- fp8
- sm80
- tma
techniques:
- async-copy
hardware_features:
- fp8
- tma
kernel_types:
- attention
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 3cea2fb6ee54fb7e1aad9db6ac6c9331184b8647
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- hopper/flash_bwd_launch_template.h
- hopper/flash_bwd_postprocess_kernel.h
- hopper/flash_bwd_preprocess_kernel.h
artifact_dir: evidence/pull-bundles/flash-attention/gh-1180
head_ref_oid: 219f89bea07790b56902166483447f90ed8041ea
---
# Add ArchTag to pre/postprocess bwd kernels

- Repository: `Dao-AILab/flash-attention`
- PR: [1180](https://github.com/Dao-AILab/flash-attention/pull/1180)
- 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

- `hopper/flash_bwd_launch_template.h`
- `hopper/flash_bwd_postprocess_kernel.h`
- `hopper/flash_bwd_preprocess_kernel.h`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-1180`
