Worked on the mrousavy/swift repository to implement IR-level instrumentation and profile-guided optimization features in Swift. Developed three new instrumentation flags, integrating them into the IR generation process to enable both IR-level and context-sensitive instrumentation, as well as support for profile-guided optimization input data. Used Swift and C++ to build comprehensive validation tests, covering edge cases such as missing or invalid IR profiles to minimize runtime and compile-time risks. Coordinated with related Swift Driver work to ensure future end-to-end integration, and documented cross-repository dependencies. The work emphasized compiler design and performance optimization, aligning with ongoing community instrumentation discussions.