---
id: pr-quack-97
repo: Dao-AILab/quack
pr: 97
title: '[BugFix] Fix `_is_warp_leader` in `TraceContext` '
author: jeromeku
date: '2026-04-05'
url: https://github.com/Dao-AILab/quack/pull/97
source_category: upstream-code
architectures:
- sm100
tags:
- cute
- cute-dsl
- cutlass
- quack
techniques:
- warp-specialization
hardware_features: []
kernel_types: []
languages:
- cute-dsl
captured_at: '2026-05-16'
status: merged
merge_sha: f9c40fdb699ace61e59448defe3a214862181efa
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- quack/trace.py
artifact_dir: evidence/pull-bundles/quack/gh-97
head_ref_oid: 979ff5cd8db331f35b1bd09422497dacec4c6c19
---
# [BugFix] Fix `_is_warp_leader` in `TraceContext` 

- Repository: `Dao-AILab/quack`
- PR: [97](https://github.com/Dao-AILab/quack/pull/97)
- 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/trace.py`

## Evidence Bundle

`evidence/pull-bundles/quack/gh-97`
