Worked on the espressif/llvm-project repository to enhance compiler safety and stability by addressing a potential null pointer dereference in CGBuiltin.cpp. Applied a targeted refactor using C++ and compiler development expertise, replacing the getAs<> method with castAs<> to ensure safer internal type handling without altering existing functionality. This change, marked as no functional change (NFC), reduced the risk of crashes related to type casting while maintaining the compiler’s operational stability. The work focused on bug resolution rather than feature development, demonstrating careful attention to code safety and robustness within the context of large-scale C++ compiler infrastructure.