Worked on the OpenXiangShan/difftest repository, focusing on improving the reliability of vector store operations in C++. Addressed a critical bug in the StoreChecker component by refining the mask assignment logic to correctly handle misaligned vector stores, ensuring that the lower rawOffset bits were preserved. This fix prevented potential data corruption and enhanced the accuracy of verification processes during testing. The work demonstrated strong debugging and testing skills, with clear traceability through precise commit messaging and issue linkage. By resolving this issue, the developer contributed to more trustworthy test results and streamlined future maintenance of the difftest codebase.