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Jiahui Xu

PROFILE

Jiahui Xu

Over an 11-month period, contributed to the EPFL-LAP/dynamatic and YosysHQ/yosys repositories by building and maintaining advanced compiler and hardware design workflows. Focused on C++ and Python development, the work included implementing new features such as handshake protocol enhancements, memory partitioning passes, and Docker-based deployment, while also addressing critical bugs in RTL simulation, profiling, and memory operation handling. Leveraged skills in CI/CD, build systems, and hardware description languages like VHDL and Verilog to improve reliability, cross-platform compatibility, and performance. Emphasized robust testing, documentation, and code maintainability, resulting in more predictable builds and streamlined verification across toolchains.

Overall Statistics

Feature vs Bugs

56%Features

Repository Contributions

52Total
Bugs
15
Commits
52
Features
19
Lines of code
4,976
Activity Months11

Work History

April 2026

4 Commits • 1 Features

Apr 1, 2026

April 2026 monthly summary for EPFL-LAP/dynamatic: Key reliability and stability enhancements across memory dependence analysis, CI pipelines, and dependency management. Focused on delivering business value by improving accuracy of static analysis, ensuring reliable builds for main branch, and preserving stability by reverting unintended library updates. Result: more predictable performance, faster iteration, and reduced maintenance risk.

March 2026

2 Commits • 1 Features

Mar 1, 2026

March 2026 (EPFL-LAP/dynamatic): Delivered unsigned min/max intrinsic translation support to improve LLVM-to-std translation of unsigned operations. Implemented conversion logic for umax and umin intrinsics, addressing edge cases and ensuring correct semantics across backends. These changes fix issues #801 and #820 and broaden translation coverage, contributing to more reliable code generation downstream. Overall impact includes higher translation accuracy, reduced edge-case errors, and stronger cross-version LLVM IR compatibility.

February 2026

2 Commits • 1 Features

Feb 1, 2026

February 2026 (EPFL-LAP/dynamatic): Deployment and Installation Workflow Improvements with Docker readiness. Consolidated deployment experience by updating installation instructions to support prebuilt LLVM, removed references to Polygeist, and updated build instructions. Docker support improved through updates to the Dockerfile and User Guide, enabling reliable containerized deployment.

January 2026

7 Commits • 5 Features

Jan 1, 2026

January 2026 (2026-01) — Dynamatic: concise monthly summary focusing on delivering robust features, stabilizing builds, and improving memory safety. Highlights direct business value through CI-friendly changes, reliability improvements, and performance checks across EPFL-LAP/dynamatic.

December 2025

22 Commits • 8 Features

Dec 1, 2025

December 2025 — EPFL-LAP/dynamatic: Key achievements include delivering major features, fixing critical bugs, and improving CI tooling, resulting in higher reliability, better traceability, and accelerated verification cycles. Key features delivered: handshake rigidification documentation; CI/build-system enhancements with artifacts and logs; export-dot improvement: use unit name by default; LLVMIR improvements: moved passes to Transforms/LLVMIR and introduced a memory partitioning pass; codegen: added missing generators for maxsi/maxui/shrui; handshake RTL: support minsi/minui instructions; characterization: add missing uitofp char. Major bugs fixed: arithmetic core fixes for DivSI/DivUI/RemSI/RemUI across VHDL/Verilog; RAM parameter extraction/parse fixes for RAMOp; HLS Verifier patch: default vsim and clang-tidy warning; LLVMToStd: memset cast to indexType; LLVMToStd: remove debug dump; cosim: latency measurement fix in TB. Overall impact: reduces RTL/toolchain risk, improves verification clarity, and broadens backend/support coverage. Technologies/skills demonstrated: VHDL/Verilog RTL, handshake protocol and RTL design, CI/CD and artifact workflows, DOT export enhancements, LLVM IR transforms and passes, memory partitioning, code generation, and characterization workflows.

November 2025

9 Commits • 3 Features

Nov 1, 2025

November 2025 — EPFL-LAP/dynamatic monthly performance summary. Focused on delivering reliability improvements, deterministic benchmarking, and pipeline optimizations. Key business value includes more predictable performance evaluations, faster feedback loops, and streamlined CI/build processes.

October 2025

2 Commits

Oct 1, 2025

October 2025 (2025-10): Focused on stabilizing and validating the RTL simulation workflow in EPFL-LAP/dynamatic. Delivered targeted RTL simulator option bug fixes and reinforced end-to-end reliability through updated integration/spec tests. These changes reduce misconfiguration risks, shorten debugging cycles, and improve production readiness of the RTL path.

August 2025

1 Commits

Aug 1, 2025

August 2025: Stabilized memory operation handling in the CfToHandshake path of EPFL-LAP/dynamatic by reverting a refactor to convertMemoryOps, restoring original conversion logic and signature (memrefIndices removed). This fixes regression, reduces downstream handshake generation risk, and improves reliability and maintainability. No new user-facing features were delivered this month; the focus was on quality, correctness, and preparing for upcoming feature work. Commits: 9fe631d03d3d74acbd4fc7e8042aaa77536ddb52.

June 2025

1 Commits

Jun 1, 2025

June 2025 monthly summary for YosysHQ/yosys focused on cross-platform build portability and stability. A Makefile-level bug fix removed the hardcoded -soname for the libyosys.so target on non-Darwin builds, aligning with platform conventions to ensure the correct soname across Linux/BSD environments and improving packaging reliability across distributions and CI pipelines.

April 2025

1 Commits

Apr 1, 2025

April 2025 monthly summary for EPFL-LAP/dynamatic focused on profiling reliability and debugging efficiency. Delivered a targeted bug fix in the profiler argument dump to ensure unsigned integers are formatted correctly, improving accuracy of profiling data used for performance analysis and issue diagnosis. No new features released this month; maintenance and quality improvements took priority to support downstream analytics and user trust.

November 2024

1 Commits

Nov 1, 2024

Monthly summary for 2024-11 (EPFL-LAP/dynamatic). Focused on cross-toolchain compatibility and stabilizing HDL build workflows. Delivered a critical fix to antitokens instantiation syntax to accommodate toolchains that do not support empty parameter lists, improving compatibility with Quartus and reducing build failures. The work supports reliable HDL integration and faster iteration cycles across toolchains.

Activity

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Quality Metrics

Correctness93.4%
Maintainability88.4%
Architecture88.0%
Performance87.0%
AI Usage24.2%

Skills & Technologies

Programming Languages

CC++DockerfileJSONMakefileMarkdownNonePythonShellVHDL

Technical Skills

Build SystemsC programmingC++C++ DevelopmentC++ developmentC++ programmingCI/CDCLI DevelopmentCLI toolsCMakeCode GenerationCompiler DesignCompiler DevelopmentCompiler designDebugging

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

EPFL-LAP/dynamatic

Nov 2024 Apr 2026
10 Months active

Languages Used

VerilogC++JSONMarkdownShellVHDLPythonYAML

Technical Skills

Hardware Description LanguageC++DebuggingIntegrationCompiler DevelopmentMLIR

YosysHQ/yosys

Jun 2025 Jun 2025
1 Month active

Languages Used

Makefile

Technical Skills

Build SystemsMakefile