Worked on the zephyrproject-rtos/gcc repository to address a critical issue in AutoFDO count propagation, focusing on maintaining the integrity of profiling data during compiler optimization. Applied expertise in C++ and profile-guided optimization to resolve a mismatch between call graph node counts and entry block counts, which previously led to loss of profile counts and regression in MySQL HAMMERDB tests. The solution improved profiling accuracy and test stability across the AutoFDO pipeline, ensuring more reliable optimization decisions. Demonstrated strong skills in code analysis and compiler optimization, taking clear ownership of the bug fix and contributing to the robustness of the profiling workflow.