---
id: pr-tensorrt-llm-13541
repo: NVIDIA/TensorRT-LLM
pr: 13541
title: '[https://nvbugs/6098442][fix] Add fix for IMA with TRTLLM-Gen GmemReductionWithSeparateKernel'
author: pengbowang-nv
date: '2026-04-30'
url: https://github.com/NVIDIA/TensorRT-LLM/pull/13541
source_category: upstream-code
architectures:
- sm100
tags:
- attention kernel
- fmha
techniques: []
hardware_features: []
kernel_types:
- attention
- reduction
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: e09f5ef8a4265ed8c8581b1ea858e89440debc7f
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cpp/tensorrt_llm/kernels/trtllmGenKernels/fmha/fmhaKernels.h
artifact_dir: evidence/pull-bundles/tensorrt-llm/gh-13541
head_ref_oid: 6f13f2b32240fa576071357fe2f525ea12b444f5
---
# [https://nvbugs/6098442][fix] Add fix for IMA with TRTLLM-Gen GmemReductionWithSeparateKernel

- Repository: `NVIDIA/TensorRT-LLM`
- PR: [13541](https://github.com/NVIDIA/TensorRT-LLM/pull/13541)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `cpp/tensorrt_llm/kernels/trtllmGenKernels/fmha/fmhaKernels.h`

## Evidence Bundle

`evidence/pull-bundles/tensorrt-llm/gh-13541`
