January 2026 highlights: Delivered cross-domain data handling improvements in the OpenXiangShan/difftest module and hardened release processes, delivering measurable improvements in throughput, reliability, and maintainability.

Concise monthly summary for 2025-12 focused on delivering a CI-driven regression testing capability for FPGA synthesis in the OpenXiangShan/difftest repository, with automated data extraction and PR feedback.

September 2025: Focused on performance optimization, data path efficiency, and synchronized hardware/software timing for difftest. Delivered two high-impact features, established deterministic benchmarking capabilities, and laid groundwork for further FPGA optimizations. No critical bugs fixed this month; primary gains come from refactors and enhanced testability.

Concise monthly performance summary for August 2025 highlighting delivered features, fixes, impact, and technical capabilities for performance reviews.

July 2025 monthly summary focusing on architectural simplification, FPGA tooling stability, and improved documentation for reproducible FPGA-based validation. Deliverables spanned three repositories (XiangShan core, XiangShan-doc, and difftest), with strong emphasis on business value: reduced maintenance cost, faster FPGA validation cycles, and clearer onboarding for contributors.

For 2025-06, delivered targeted FPGA build and synthesis stabilization for OpenXiangShan/difftest, focusing on reliability and performance in the FPGA toolchain. The changes reduced synthesis-time blockers and improved compilation by enabling proper DMA_CHANNELS propagation and enabling GCC optimizations. In addition, a DPI-C interface improvement (dummy signal) eliminated a Vivado empty-module error, reducing CI failures.

May 2025 summary for OpenXiangShan/difftest: Delivered two performance-focused features that significantly improve validation throughput and memory efficiency. A Memory Pool Management Refactor decoupled raw memory storage from sorted data indicators, reducing memcpy overhead and improving allocation/deallocation efficiency. FPGA Difftest Batched Packet Transmission enables sending multiple packets per XDMA request, increasing PCIe bandwidth and dramatically speeding simulations. No major bugs fixed this period. Overall impact includes faster validation cycles, reduced resource usage, and improved scalability for FPGA-backed difftest workloads. Technologies demonstrated include memory pool refactor, XDMA/FPGA interfacing, and performance-oriented code design.

March 2025 OpenXiangShan/XiangShan monthly summary focusing on delivering enhanced FPGA-based testing capabilities for TileLink and improving QA coverage.

Monthly work summary for OpenXiangShan/XiangShan (2024-11). Focused on FP AGI Difftest enhancement and its impact on debugging and validation workflows.