---
id: pr-sglang-8127
repo: sgl-project/sglang
pr: 8127
title: '[Fix][Ready]Fix register spilling in cutlass nvfp4 gemm kernel on Blackwell'
author: HydraQYH
date: '2025-07-18'
url: https://github.com/sgl-project/sglang/pull/8127
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
- gemm
- nvfp4
techniques: []
hardware_features:
- fp4
- nvfp4
kernel_types:
- gemm
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 6e92da8fca18c746a0aa15c7bd95b47b6827befa
inclusion_reason: kernel file changes
changed_paths:
- sgl-kernel/csrc/gemm/nvfp4_scaled_mm_kernels.cu
head_ref_oid: 1dab27ecb3a4388a83027eae5bdb7ae07d2e41bb
artifact_dir: evidence/pull-bundles/sglang/gh-8127
---
# [Fix][Ready]Fix register spilling in cutlass nvfp4 gemm kernel on Blackwell

- Repository: `sgl-project/sglang`
- PR: [8127](https://github.com/sgl-project/sglang/pull/8127)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `sgl-kernel/csrc/gemm/nvfp4_scaled_mm_kernels.cu`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-8127`
