---
id: pr-quack-120
repo: Dao-AILab/quack
pr: 120
title: Fix ColVecReduce shared-memory staging
author: alecco
date: '2026-04-26'
url: https://github.com/Dao-AILab/quack/pull/120
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- cute
- gemm
- hopper
- quack
- sm100
- sm90
techniques: []
hardware_features:
- blackwell
- hopper
kernel_types:
- gemm
languages:
- cute-dsl
captured_at: '2026-05-16'
status: merged
merge_sha: 9598e0b39868c163eb74f1e2a18d351c2de76289
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- quack/epi_ops.py
- quack/gemm_sq_reduce.py
- tests/test_epi_ops.py
artifact_dir: evidence/pull-bundles/quack/gh-120
head_ref_oid: dbf3a1f8ca46a6db2eb41b7aad22b11c2564fb7e
---
# Fix ColVecReduce shared-memory staging

- Repository: `Dao-AILab/quack`
- PR: [120](https://github.com/Dao-AILab/quack/pull/120)
- 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/epi_ops.py`
- `quack/gemm_sq_reduce.py`
- `tests/test_epi_ops.py`

## Evidence Bundle

`evidence/pull-bundles/quack/gh-120`
