Worked on the rust-lang/gcc repository to optimize ARC architecture multiplication operations within the compiler. Focused on introducing new instruction patterns in C and assembly language that improve zero-flag handling and overflow detection by leveraging hardware intrinsics. Updated the test suite to align with these compiler changes, ensuring that tests accurately reflect the new behavior and improved correctness. The work enhanced both performance and reliability of ARC-compiled code paths, particularly in embedded systems contexts. Emphasized test suite development to maintain coverage and consistency, resulting in more robust compiler outputs and better alignment between implementation and validation processes. No bugs were reported.