---
id: pr-flashinfer-2798
repo: flashinfer-ai/flashinfer
pr: 2798
title: Upgrade cutlass 4.2.1 -> 4.4.2
author: kahyunnam
date: '2026-03-19'
url: https://github.com/flashinfer-ai/flashinfer/pull/2798
source_category: upstream-code
architectures:
- sm100
tags:
- gemm
- moe
- tma
techniques: []
hardware_features:
- tma
kernel_types:
- gemm
- moe
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 9276e441898789e3ff21c397ca942103bf76cb12
inclusion_reason: kernel file changes
changed_paths:
- 3rdparty/cutlass
- csrc/nv_internal/tensorrt_llm/cutlass_extensions/include/cutlass_extensions/gemm/collective/builders/sm90_gmma_builder_mixed_input.inl
- csrc/nv_internal/tensorrt_llm/kernels/cutlass_kernels/fpA_intB_gemm/fpA_intB_gemm_template.h
- csrc/nv_internal/tensorrt_llm/kernels/cutlass_kernels/fpA_intB_gemm/launchers/fpA_intB_launcher_sm90.inl
- csrc/nv_internal/tensorrt_llm/kernels/cutlass_kernels/moe_gemm/launchers/moe_gemm_tma_ws_mixed_input_launcher.inl
- csrc/nv_internal/tensorrt_llm/kernels/cutlass_kernels/moe_gemm/moe_gemm_template_dispatch.h
head_ref_oid: 6fdaa519667ed9435c995aaac2fb10a27980757c
artifact_dir: evidence/pull-bundles/flashinfer/gh-2798
---
# Upgrade cutlass 4.2.1 -> 4.4.2

- Repository: `flashinfer-ai/flashinfer`
- PR: [2798](https://github.com/flashinfer-ai/flashinfer/pull/2798)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `3rdparty/cutlass`
- `csrc/nv_internal/tensorrt_llm/cutlass_extensions/include/cutlass_extensions/gemm/collective/builders/sm90_gmma_builder_mixed_input.inl`
- `csrc/nv_internal/tensorrt_llm/kernels/cutlass_kernels/fpA_intB_gemm/fpA_intB_gemm_template.h`
- `csrc/nv_internal/tensorrt_llm/kernels/cutlass_kernels/fpA_intB_gemm/launchers/fpA_intB_launcher_sm90.inl`
- `csrc/nv_internal/tensorrt_llm/kernels/cutlass_kernels/moe_gemm/launchers/moe_gemm_tma_ws_mixed_input_launcher.inl`
- `csrc/nv_internal/tensorrt_llm/kernels/cutlass_kernels/moe_gemm/moe_gemm_template_dispatch.h`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-2798`
