---
id: pr-sglang-20384
repo: sgl-project/sglang
pr: 20384
title: '[Fix] Add fallback for flashinfer allreduce fusion'
author: Fridge003
date: '2026-03-13'
url: https://github.com/sgl-project/sglang/pull/20384
source_category: upstream-code
architectures:
- sm100
tags:
- kernel-fusion
techniques:
- kernel-fusion
hardware_features: []
kernel_types: []
languages:
- python
captured_at: '2026-04-17'
status: merged
merge_sha: f8668d9e78a1a50b8f88faabaea4710acff683c1
inclusion_reason: semantic match with file changes
changed_paths:
- python/sglang/srt/layers/communicator.py
- python/sglang/srt/layers/flashinfer_comm_fusion.py
- python/sglang/srt/layers/layernorm.py
head_ref_oid: 0b1474320a7d2ccfcf4df7755c399c1700f3393a
artifact_dir: evidence/pull-bundles/sglang/gh-20384
---
# [Fix] Add fallback for flashinfer allreduce fusion

- Repository: `sgl-project/sglang`
- PR: [20384](https://github.com/sgl-project/sglang/pull/20384)
- Decision: `semantic match with file changes`
- Reason: semantic match with file changes

## Changed Paths

- `python/sglang/srt/layers/communicator.py`
- `python/sglang/srt/layers/flashinfer_comm_fusion.py`
- `python/sglang/srt/layers/layernorm.py`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-20384`
