---
id: pr-vllm-24833
repo: vllm-project/vllm
pr: 24833
title: '[Bugfix] Fix accuracy issue for silu_mul + nvfp4 quant fusion kernel'
author: elvischenv
date: '2025-09-17'
url: https://github.com/vllm-project/vllm/pull/24833
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
- kernel-fusion
- nvfp4
- pipeline-stages
- quantization
techniques:
- kernel-fusion
- pipeline-stages
hardware_features:
- fp4
- nvfp4
kernel_types:
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: e6585ddb451ba6056e044184f7fc88dcc13f8cfe
inclusion_reason: kernel file changes
changed_paths:
- .buildkite/test-pipeline.yaml
- csrc/quantization/fp4/activation_nvfp4_quant_fusion_kernels.cu
- tests/compile/test_silu_mul_quant_fusion.py
- tests/kernels/quantization/test_silu_mul_nvfp4_quant.py
- tests/kernels/quantization/test_silu_nvfp4_quant_fusion.py
head_ref_oid: afcd1556c88ec4fc5d506965321327e652bb1358
artifact_dir: evidence/pull-bundles/vllm/gh-24833
---
# [Bugfix] Fix accuracy issue for silu_mul + nvfp4 quant fusion kernel

- Repository: `vllm-project/vllm`
- PR: [24833](https://github.com/vllm-project/vllm/pull/24833)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `.buildkite/test-pipeline.yaml`
- `csrc/quantization/fp4/activation_nvfp4_quant_fusion_kernels.cu`
- `tests/compile/test_silu_mul_quant_fusion.py`
- `tests/kernels/quantization/test_silu_mul_nvfp4_quant.py`
- `tests/kernels/quantization/test_silu_nvfp4_quant_fusion.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-24833`
