---
id: pr-vllm-36518
repo: vllm-project/vllm
pr: 36518
title: '[Kernel] Fuse FP8 output quantization into merge_attn_states'
author: carlyou
date: '2026-04-03'
url: https://github.com/vllm-project/vllm/pull/36518
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- fp8
- kernel-fusion
- quantization
techniques:
- kernel-fusion
hardware_features:
- fp8
kernel_types:
- attention
- quantization
languages:
- cuda-cpp
- triton
captured_at: '2026-04-27'
status: merged
merge_sha: 3bc2734dd03d2073e1ba066bda042b4b085037bd
inclusion_reason: kernel file changes
changed_paths:
- benchmarks/fused_kernels/merge_attn_states_benchmarks.py
- csrc/attention/merge_attn_states.cu
- csrc/ops.h
- csrc/torch_bindings.cpp
- tests/kernels/attention/test_merge_attn_states.py
- vllm/_custom_ops.py
- vllm/v1/attention/ops/merge_attn_states.py
- vllm/v1/attention/ops/triton_merge_attn_states.py
head_ref_oid: 57a8cba6fbf8b2f28f7f08c963fa610b878f73e0
artifact_dir: evidence/pull-bundles/vllm/gh-36518
---
# [Kernel] Fuse FP8 output quantization into merge_attn_states

- Repository: `vllm-project/vllm`
- PR: [36518](https://github.com/vllm-project/vllm/pull/36518)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `benchmarks/fused_kernels/merge_attn_states_benchmarks.py`
- `csrc/attention/merge_attn_states.cu`
- `csrc/ops.h`
- `csrc/torch_bindings.cpp`
- `tests/kernels/attention/test_merge_attn_states.py`
- `vllm/_custom_ops.py`
- `vllm/v1/attention/ops/merge_attn_states.py`
- `vllm/v1/attention/ops/triton_merge_attn_states.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-36518`
