Worked on the golang/go repository to enhance compiler stability and test reliability, focusing on cross-architecture correctness for MIPSLE on 32-bit systems. Addressed a subtle sign-extension bug in the SSA rewrite path, ensuring that unsigned values maintain correct semantics and preventing internal compiler errors related to type casting for Hash and Kind_ fields. Improved the test suite by skipping unsupported MIPSLE architectures, reducing CI noise and aligning tests with supported platforms. Leveraged Go, compiler design, and testing expertise to deliver robust, well-reviewed changes, collaborating across teams to validate updates and maintain high standards for code quality and cross-platform behavior.