Worked on the llvm/clangir repository to address a bug in Clang’s TypePrinter, focusing on the correct placement of preserve calling-convention attributes for function-pointer types. Using C and C++, applied AST manipulation and attribute handling techniques to ensure attributes such as preserve_none, preserve_most, and preserve_all appear before the type in generated output, resolving compilation errors. Developed and integrated regression tests to validate the fix and prevent future issues, thereby improving the reliability of the TypePrinter and the IR/AST generation pipeline. Delivered a focused patch and test updates, contributing to more predictable output and reducing developer debugging time.