Worked on stabilizing FIRRTL memory operations within the llvm/circt repository, focusing on a critical bug fix rather than new feature development. Addressed a memory mask indexing issue in the memory lowering process by correcting the order of mask indices and reversing mask widths to align with FIRRTL lowering semantics. Updated and expanded the associated test suite to improve regression safety and ensure proper masking behavior in downstream code generation. Utilized C++, MLIR, and expertise in compiler design and hardware description languages to deliver a patch that enhances the reliability of memory operations and reduces the risk of subtle masking bugs.