---
id: pr-quack-59
repo: Dao-AILab/quack
pr: 59
title: Don't write to same tile twice in symmetric gemm
author: JackCharlesZhang
date: '2025-12-07'
url: https://github.com/Dao-AILab/quack/pull/59
source_category: upstream-code
architectures:
- sm100
tags:
- gemm
techniques: []
hardware_features: []
kernel_types:
- gemm
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 21f1c053b1c35a3aaf20002107d0704f364de10a
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- quack/gemm_symmetric.py
artifact_dir: evidence/pull-bundles/quack/gh-59
head_ref_oid: 13161e0c4cef3325f38033f6c1a761a7d3c63535
---
# Don't write to same tile twice in symmetric gemm

- Repository: `Dao-AILab/quack`
- PR: [59](https://github.com/Dao-AILab/quack/pull/59)
- 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

- `quack/gemm_symmetric.py`

## Evidence Bundle

`evidence/pull-bundles/quack/gh-59`
