Worked on improving build stability for the facebookresearch/faiss repository by addressing cross-architecture compilation issues related to SIMD operations. Focused on the faiss/utils/rabitq_simd.h file, the developer introduced macro guards using __AVX512F__ and __AVX2__ to ensure that AVX512 and AVX2-specific code paths only compile on compatible CPUs. This approach reduced continuous integration failures and minimized integration risks by validating builds across different AVX configurations. The work was implemented in C++ and leveraged expertise in compiler directives and SIMD programming, with careful attention to maintain portability, avoid performance regressions, and align with existing code patterns for long-term maintainability.