Worked on the espressif/llvm-project repository to improve the reliability and accuracy of the M680x0 backend, focusing on test corrections and assembler behavior. Addressed a bug in the test suite by ensuring the move-from-SR instruction was validated on the correct M68010 CPU, which improved architecture-specific test coverage. Resolved an assembler misinterpretation that previously led to incorrect move instruction generation for the M68000, thereby reducing test failures and enhancing CI stability. Utilized skills in compiler development, low-level programming, and testing, with a particular emphasis on Assembly language, to strengthen cross-architecture validation and maintain code quality in the LLVM test suite.