Worked on reliability improvements for the espressif/llvm-project repository, focusing on the MLIR inliner component. Addressed a critical issue where indirect recursive calls, such as A calling B and B calling A, could cause infinite loops during inlining. Enhanced the inlining logic in C++ to correctly detect and prevent these problematic patterns, thereby stabilizing the inliner’s behavior in complex call graphs. Developed and integrated targeted regression tests to validate the fix and expanded CI coverage to ensure ongoing stability. Applied skills in code analysis, compiler development, and testing, with a particular emphasis on MLIR and C++ technologies throughout the process.