---
id: pr-vllm-40191
repo: vllm-project/vllm
pr: 40191
title: '[Bugfix] Guard mxfp4_experts_quant bindings on ENABLE_NVFP4_SM100'
author: ultism
date: '2026-04-18'
url: https://github.com/vllm-project/vllm/pull/40191
source_category: upstream-code
architectures:
- sm100
tags:
- CUDA kernel
- blackwell
- csrc kernel
- gemm_quant
- mxfp4
- nvfp4
- sm100
techniques:
- fine-grained-quantization
- kernel-fusion
hardware_features:
- blackwell
- fp4
- mxfp4
- nvfp4
kernel_types:
- gemm
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: d0359f3e0401f3ccb3b8fb66658908c08d265a44
inclusion_reason: Inspect scale layout, accumulator type, tile/schedule choice, epilogue fusion, and partial-tile guards before deriving a candidate.
changed_paths:
- csrc/libtorch_stable/ops.h
- csrc/libtorch_stable/quantization/fp4/mxfp4_experts_quant.cu
- csrc/libtorch_stable/torch_bindings.cpp
artifact_dir: evidence/pull-bundles/vllm/gh-40191
head_ref_oid: c793cc42955969a33db3702f161a15c96e5df2ff
---
# [Bugfix] Guard mxfp4_experts_quant bindings on ENABLE_NVFP4_SM100

- Repository: `vllm-project/vllm`
- PR: [40191](https://github.com/vllm-project/vllm/pull/40191)
- Decision: `Inspect scale layout, accumulator type, tile/schedule choice, epilogue fusion, and partial-tile guards before deriving a candidate.`
- Reason: Inspect scale layout, accumulator type, tile/schedule choice, epilogue fusion, and partial-tile guards before deriving a candidate.

## Changed Paths

- `csrc/libtorch_stable/ops.h`
- `csrc/libtorch_stable/quantization/fp4/mxfp4_experts_quant.cu`
- `csrc/libtorch_stable/torch_bindings.cpp`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-40191`
