Zhenhang Wang standardized fill operations across the llvm/clangir repository by introducing llvm::fill and systematically replacing all instances of std::fill throughout the codebase. Working in C++ and leveraging deep knowledge of LLVM internals, Zhenhang updated documentation, header files, and source files related to code generation and execution to ensure consistent usage of the new fill primitive. This targeted change, delivered as a single, traceable commit, reduced variation in fill usage and laid the groundwork for future LLVM-specific optimizations. The work improved maintainability and consistency, making future enhancements and analysis of fill operations across the codebase more straightforward.