Worked on the YosysHQ/yosys repository to address cross-tool consistency for FPGA synthesis targeting Gowin devices. Focused on maintenance and parity, the developer delivered a targeted bug fix to the ALU MULT mode, specifically correcting the calculation of the S output to match nextpnr behavior. This adjustment ensured that multiplication results remained consistent across different synthesis tools, reducing discrepancies and improving reliability for Gowin-based builds. The work involved SystemVerilog and hardware description language expertise, emphasizing careful preservation of existing functionality while aligning tool outputs. Over the month, the developer concentrated on quality assurance and maintenance rather than introducing new features.