[Refactor] Phaseout legacy loop vectorize dynamic pass

[LeiWang1999]

This pull request removes the LoopVectorizeDynamic transformation pass from both the implementation and its usage in the codebase. This streamlines the lowering phase by no longer attempting to vectorize loops with dynamic shapes, likely due to changes in upstream dependencies or project direction.

Removals related to loop vectorization:

• Removed the call to tilelang.transform.LoopVectorizeDynamic() from the LowerAndLegalize function in tilelang/engine/phase.py, so loops with dynamic shapes are no longer vectorized during this phase.
• Deleted the LoopVectorizeDynamic function from tilelang/transform/__init__.py, fully removing its definition and documentation.

Other changes:

• Updated the .git_commit.txt file with a new commit hash, likely reflecting the latest upstream or submodule state.

Summary by CodeRabbit

• Chores

  • Added internal commit reference tracking.

• Revert

  • Removed dynamic loop vectorization optimization pass from the compiler transformation pipeline.

[github-actions]

👋 Hi! Thank you for contributing to the TileLang project.

Please remember to run pre-commit run --all-files in the root directory of the project to ensure your changes are properly linted and formatted. This will help ensure your contribution passes the format check.

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[coderabbitai]

Walkthrough

The changes remove the dynamic loop vectorization feature completely. This includes deletion of the implementation file, removal of the pass from the lowering pipeline, and removal of its public API function, leaving no dynamic vectorization capabilities in the codebase.

Changes

Cohort / File(s)	Summary
Complete removal of dynamic vectorization implementation src/transform/loop_vectorize_dynamic.cc	Entire file deleted, removing all classes (VectorizePlannerDynamic, VectorizedBodyMutator, VectorizeRewriterDynamic, etc.), functions, and the LoopVectorizeDynamic pass registration.
Pipeline and API removal tilelang/engine/phase.py, tilelang/transform/__init__.py	Removed LoopVectorizeDynamic pass invocation from LowerAndLegalize pipeline; removed LoopVectorizeDynamic function export from public module API.
Metadata addition .git_commit.txt	New file added containing commit hash reference.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• All changes are straightforward deletions with no complex logic to evaluate
• File removal is complete and unambiguous
• API removal consists of simple line deletions without side effects to review
• Verify no other references to LoopVectorizeDynamic remain in codebase

Poem

🐰 A branch is pruned from the mighty tree,
Dynamic loops now dancing free!
The vectorizer takes its rest,
Simpler paths prove the best.
With cleaner code and lighter load,
The engine speeds down a smoother road! 🚀

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately summarizes the main change: removal of the legacy LoopVectorizeDynamic pass from the codebase and its pipeline usage.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between b10d49b and f4bd755.

📒 Files selected for processing (4)

• .git_commit.txt (1 hunks)
• src/transform/loop_vectorize_dynamic.cc (0 hunks)
• tilelang/engine/phase.py (0 hunks)
• tilelang/transform/__init__.py (0 hunks)

💤 Files with no reviewable changes (3)

• tilelang/transform/init.py
• tilelang/engine/phase.py
• src/transform/loop_vectorize_dynamic.cc

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: Quick Lint

🔇 Additional comments (1)

.git_commit.txt (1)

1-1: Add trailing newline and verify commit hash.

The commit hash format is valid, but the file is missing a trailing newline—a common convention for text files in most projects. Additionally, note that other files mentioned in the PR objectives (tilelang/engine/phase.py, tilelang/transform/__init__.py, and the implementation of LoopVectorizeDynamic) are not included in this review, so I cannot assess the full scope of the refactoring.

Apply this diff to add the trailing newline:

-30d8dedd5a00fbefb7d9fe56c62f7ac4fb7ec4c7
\ No newline at end of file
+30d8dedd5a00fbefb7d9fe56c62f7ac4fb7ec4c7

Please confirm:

1. That this commit hash matches the actual merge commit or reference point for this refactoring.
2. Whether this .git_commit.txt file serves a specific purpose in your build/distribution pipeline.

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