Ana Mihajlovic focused on enhancing the AMDGPU backend in the intel/llvm repository, addressing a critical bug affecting hardware stage maximum value handling for LDS size. She refactored the setHwStage logic into updateHwStageMaximum, ensuring accurate updates to metadata fields and preventing zero LDS size in one function from overwriting values in another. Using C++ and LLVM IR, Ana implemented regression tests to verify correctness and improve backend stability. Her work reduced the risk of incorrect code generation and runtime issues on AMD GPUs, demonstrating depth in compiler development, GPU programming, and low-level optimization within a complex, performance-sensitive codebase.