---
id: pr-vllm-20396
repo: vllm-project/vllm
pr: 20396
title: '[Kernel] SM90 CUTLASS FP8 GEMM: add support for swap AB + kernel tuning'
author: LyrisZhong
date: '2025-07-28'
url: https://github.com/vllm-project/vllm/pull/20396
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- fp8
- gemm
- quantization
techniques: []
hardware_features:
- fp8
kernel_types:
- gemm
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: c6c9122d50a836046a0bd5360bd98f29f4e70667
inclusion_reason: kernel file changes
changed_paths:
- csrc/quantization/cutlass_w8a8/c3x/scaled_mm_sm90_fp8.cu
- csrc/quantization/cutlass_w8a8/c3x/scaled_mm_sm90_fp8_dispatch.cuh
- tests/kernels/quantization/test_cutlass_scaled_mm.py
head_ref_oid: 35b5975a0abea6981f35a0a4c03d6d1d93aeb8fc
artifact_dir: evidence/pull-bundles/vllm/gh-20396
---
# [Kernel] SM90 CUTLASS FP8 GEMM: add support for swap AB + kernel tuning

- Repository: `vllm-project/vllm`
- PR: [20396](https://github.com/vllm-project/vllm/pull/20396)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/quantization/cutlass_w8a8/c3x/scaled_mm_sm90_fp8.cu`
- `csrc/quantization/cutlass_w8a8/c3x/scaled_mm_sm90_fp8_dispatch.cuh`
- `tests/kernels/quantization/test_cutlass_scaled_mm.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-20396`
