---
id: pr-tensorrt-llm-14054
repo: NVIDIA/TensorRT-LLM
pr: 14054
title: '[https://nvbugs/6162323][fix] Make mxfp4 H20 swizzle WAR more robust'
author: dongfengy
date: '2026-05-15'
url: https://github.com/NVIDIA/TensorRT-LLM/pull/14054
source_category: upstream-code
architectures:
- sm100
tags:
- mxfp4
techniques:
- swizzling
hardware_features:
- fp4
- mxfp4
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 3ae0b706046c447783943923712a1310f0d844d5
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- tensorrt_llm/_torch/modules/fused_moe/fused_moe_triton.py
- tests/integration/defs/accuracy/test_llm_api_pytorch.py
- tests/integration/test_lists/waives.txt
artifact_dir: evidence/pull-bundles/tensorrt-llm/gh-14054
head_ref_oid: 0e0c1ca1ebe1150265a33c542c6d296db330e50d
---
# [https://nvbugs/6162323][fix] Make mxfp4 H20 swizzle WAR more robust

- Repository: `NVIDIA/TensorRT-LLM`
- PR: [14054](https://github.com/NVIDIA/TensorRT-LLM/pull/14054)
- 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

- `tensorrt_llm/_torch/modules/fused_moe/fused_moe_triton.py`
- `tests/integration/defs/accuracy/test_llm_api_pytorch.py`
- `tests/integration/test_lists/waives.txt`

## Evidence Bundle

`evidence/pull-bundles/tensorrt-llm/gh-14054`
