gemini-code-assist[bot] commented on PR #18720: URL: https://github.com/apache/tvm/pull/18720#issuecomment-3863326225
## Summary of Changes Hello @shreyasravi320, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request implements a significant optimization pass for the Relax IR: Dead Parameter Elimination. This pass systematically identifies and removes function parameters that are not utilized within their respective function bodies. By doing so, it streamlines the IR, leading to more efficient code generation and reduced resource consumption. The implementation involves an iterative process of analyzing parameter usage and subsequently rewriting function signatures and all associated call sites. ### Highlights * **New Optimization Pass**: Introduced Dead Parameter Elimination (DPE) to the Relax IR, which automatically identifies and removes unused parameters from Relax functions. * **Motivation and Benefits**: The DPE pass aims to reduce memory usage, speed up compilation, and simplify the Intermediate Representation (IR) by cleaning up functions that have accumulated unused parameters due to deprecated architectures, API evolution, or refactoring. * **Algorithm Implementation**: The DPE algorithm works by iteratively collecting unused parameters across all functions, then updating function signatures and their corresponding call sites in topological order until no further changes are detected. * **Test Coverage**: New Python tests have been added to validate the DPE pass, specifically covering complex scenarios such as mutual recursion and deep recursion chains to ensure robust parameter removal. 🧠**New Feature in Public Preview:** You can now enable **Memory** to help **Gemini Code Assist** learn from your team's feedback. This makes future code reviews more consistent and personalized to your project's style. **Click [here](https://codeassist.google/code-review/login) to enable Memory in your admin console.** <details> <summary><b>Changelog</b></summary> * **src/ir/module.cc** * Updated `IRModuleNode::AddUnchecked` to ensure `GlobalVarNode`'s `struct_info_` is correctly updated when a function is added, aligning with the function's `struct_info_`. * **src/relax/transform/dead_code_elimination.cc** * Added a new `RemoveUnusedParameters` function to perform the core dead parameter elimination logic. * Integrated `RemoveUnusedParameters` into the main `DeadCodeElimination` pass as a new stage (S3), followed by re-running unused function and variable removal stages. * Implemented `CollectUsedParamIndices` to determine which parameters are actively used within each function. * Introduced `CallSiteUpdater` as an `ExprMutator` to modify call expressions by removing arguments corresponding to eliminated parameters. * Updated comments to reflect the new dead parameter elimination capability within the `dead_code_elimination.cc` file. * **tests/python/relax/test_transform_dead_code_elimination.py** * Modified existing test cases to include comments indicating parameters that are expected to be removed by the DPE pass. * Added `test_mutual_recursion_unused_params` to verify DPE functionality in mutually recursive functions. * Added `test_deep_recursion_chain` to test DPE across a chain of recursive calls. </details> <details> <summary><b>Activity</b></summary> * The author, shreyasravi320, has introduced a new Dead Parameter Elimination pass for Relax functions. * The pull request includes a detailed description outlining the motivation, algorithm, and example usage of the new pass. * New test cases have been added to `test_transform_dead_code_elimination.py` to validate the DPE pass, including scenarios with mutual and deep recursion. * The author has listed several TODO items, indicating plans for further enhancements such as handling mutual recursion (though tests for it are present), benchmarking, and documentation. </details> <details> <summary><b>Using Gemini Code Assist</b></summary> <br> The full guide for Gemini Code Assist can be found on our [documentation page](https://developers.google.com/gemini-code-assist/docs/review-github-code), here are some quick tips. <b>Invoking Gemini</b> You can request assistance from Gemini at any point by creating a comment using either `/gemini <command>` or `@gemini-code-assist <command>`. 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