During January 2025, João Barbosa focused on improving the correctness of vector instruction semantics in the jasmin-lang/jasmin repository. He addressed a subtle bug in the VPCMPGT operation by updating the comparison logic within JWord.ec, replacing the <= operator with < to ensure accurate 'greater than' semantics. This targeted fix, implemented using ECL and leveraging his expertise in compiler development and low-level programming, reduced the risk of misbehavior in vector compare paths. By isolating and resolving this issue, João enhanced the reliability and predictability of downstream code generation, supporting safer optimizations for users relying on precise vector operations.