---
id: pr-vllm-23140
repo: vllm-project/vllm
pr: 23140
title: Fix nvfp4 swizzling
author: yiliu30
date: '2025-08-21'
url: https://github.com/vllm-project/vllm/pull/23140
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
- nvfp4
- quantization
- swizzling
techniques:
- swizzling
hardware_features:
- fp4
- nvfp4
kernel_types:
- quantization
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 0278f1ac3ac90c245a9a000cb11eb3146103cfd1
inclusion_reason: kernel file changes
changed_paths:
- vllm/model_executor/layers/quantization/compressed_tensors/schemes/compressed_tensors_w4a4_nvfp4.py
- vllm/model_executor/layers/quantization/utils/quant_utils.py
head_ref_oid: 4cde09e0b9340fdfd12eb9414e9feb215bd69bf5
artifact_dir: evidence/pull-bundles/vllm/gh-23140
---
# Fix nvfp4 swizzling

- Repository: `vllm-project/vllm`
- PR: [23140](https://github.com/vllm-project/vllm/pull/23140)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `vllm/model_executor/layers/quantization/compressed_tensors/schemes/compressed_tensors_w4a4_nvfp4.py`
- `vllm/model_executor/layers/quantization/utils/quant_utils.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-23140`
