---
id: pr-flashinfer-2898
repo: flashinfer-ai/flashinfer
pr: 2898
title: 'fix: snap weight_scale_vec_size to handle block_scale_interleave padding for SM120'
author: samuellees
date: '2026-04-05'
url: https://github.com/flashinfer-ai/flashinfer/pull/2898
source_category: upstream-code
architectures:
- sm100
tags:
- block-scale
- fp4
- kernel-fusion
- moe
- quantization
techniques:
- kernel-fusion
hardware_features:
- block-scale
- fp4
kernel_types:
- moe
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: c4cb6e0117a4201f130dd6c48bb57289aaae0046
inclusion_reason: kernel file changes
changed_paths:
- csrc/trtllm_fused_moe_kernel_launcher.cu
- flashinfer/quantization/fp4_quantization.py
- tests/moe/test_trtllm_cutlass_fused_moe.py
head_ref_oid: ebfd95b6af69139f35808e640df93e5047894e50
artifact_dir: evidence/pull-bundles/flashinfer/gh-2898
---
# fix: snap weight_scale_vec_size to handle block_scale_interleave padding for SM120

- Repository: `flashinfer-ai/flashinfer`
- PR: [2898](https://github.com/flashinfer-ai/flashinfer/pull/2898)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/trtllm_fused_moe_kernel_launcher.cu`
- `flashinfer/quantization/fp4_quantization.py`
- `tests/moe/test_trtllm_cutlass_fused_moe.py`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-2898`
