---
id: pr-flash-attention-2463
repo: Dao-AILab/flash-attention
pr: 2463
title: fix causal calcs
author: drisspg
date: '2026-04-20'
url: https://github.com/Dao-AILab/flash-attention/pull/2463
source_category: upstream-code
architectures:
- sm100
tags:
- attention
techniques: []
hardware_features: []
kernel_types:
- attention
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 41b2ef6cb5b372076802dd5202ca9441b8211d20
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- AI/CLC_TRACE_DEBUG.md
- AI/parse_clc_log.py
- CLAUDE.md
- benchmarks/clc_bench.py
- benchmarks/configs/clc.yaml
artifact_dir: evidence/pull-bundles/flash-attention/gh-2463
head_ref_oid: e83664a25e29ab50fdcef96e54a0d39ddbec6b59
---
# fix causal calcs

- Repository: `Dao-AILab/flash-attention`
- PR: [2463](https://github.com/Dao-AILab/flash-attention/pull/2463)
- 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

- `AI/CLC_TRACE_DEBUG.md`
- `AI/parse_clc_log.py`
- `CLAUDE.md`
- `benchmarks/clc_bench.py`
- `benchmarks/configs/clc.yaml`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-2463`
