The article 'LLVM: The Bad Parts' by NPopov outlines significant challenges faced by the LLVM project, highlighting areas where the compiler infrastructure can improve. As the lead maintainer, NPopov identifies several high-level issues that affect the project's efficiency and development pace. One of the primary concerns is insufficient review capacity, where the number of contributors exceeds the number of reviewers, leading to delays and potential quality issues.

This is exacerbated by a peculiar contribution model that requires authors to request reviewers, which can be challenging for new contributors. Additionally, the frequent changes in LLVM's C++ API and LLVM IR, while beneficial for evolving the project, impose costs on users who need to keep up with these changes. The size of LLVM also presents challenges, with over 2.5 million lines of C++ code, leading to long build times and the need for fast hardware or build farms.

The instability of LLVM's CI system, with over 200 post-commit buildbots, is another area of concern, as it often results in false positives and dilutes the signal for real failures. Furthermore, the lack of end-to-end testing and backend divergence are highlighted as areas requiring improvement. These issues underscore the need for enhancements in LLVM's development process to ensure the project can continue to grow and adapt while maintaining quality and efficiency.

Developers and organizations relying on LLVM will be particularly interested in these insights, as they could impact their ability to work with and benefit from the compiler infrastructure.LLVM's challenges are not insurmountable, and the article provides a roadmap for potential improvements, such as implementing a Rust-style PR assignment system and focusing on flaky tests and buildbots. These improvements are crucial for maintaining LLVM's position as a leading open-source compiler project. The article serves as a call to action for the community to address these issues and contribute to the project's continued success.

By tackling these challenges, LLVM can enhance its developer experience, stabilize its infrastructure, and ensure it remains a robust and reliable tool for compilers and developers alike.