Compiler & Systems Work

Open-source compiler work, IR infrastructure, and performance-focused engineering.

Open Source · Google Summer of Code

Rust-GCC/gccrs

C++, Compiler, GCC Frontend for Rust

  • Selected as a Google Summer of Code contributor to work on Rust Drop support in gccrs, with rustc 1.49 used as a reference for the implementation design.
  • Implemented structured Drop cleanup for block and function scopes, function parameters, explicit returns, and unlabeled break and continue paths.
  • Implemented straight-line BIR Drop-state analysis and connected it to backend cleanup; now extending the analysis across CFG branches to handle conditional moves and prevent double drops.
Read Final Report View Pull Requests on GitHub Read GCC Mailing List Updates
Open Source

xDSL

Python, MLIR-style Compiler Infrastructure

  • Contributed to xDSL's Linalg dialect and IR transformation infrastructure.
  • Worked on linalg.generic conversion and Linalg-to-loops lowering for dynamic bounds and index operations.
  • Added basic tiling support.
View Pull Requests on GitHub
Project · Aug. 2025

LLVM Pass Development

LLVM IR, optimization, benchmarking

  • Built an LLVM optimization pass that replaces selected constant-exponent pow calls with exp/log-based forms in LLVM IR.
  • Verified 4-10% speedup over -O3 on real image-processing workloads.
View Project on GitHub
Project · Nov. 2024

ARM SVE Performance Optimization

C/C++, SVE, GCC, GDB, AWS Graviton

  • Vectorized C++ code using ARM Scalable Vector Extension (SVE), achieving 3.1x acceleration in large-scale data processing.
  • Verified performance with hardware counters on AWS Graviton3.
  • Inspected GCC GIMPLE and assembly output to confirm expected SVE instructions.
View Project on GitHub
Work Experience · Jun. 2024-Sept. 2024

Bristol Eye Hospital

Software Engineer, Python · Contracted Academic Project with University of Bristol

  • Designed an AI application for Bristol Eye Hospital to improve referral-letter processing.
  • Worked on OCR API profiling, LLM fine-tuning and deployment on AWS SageMaker, and information extraction from referral letters.

About

Li-Hsin (Janet)

I'm Li-Hsin, also known as Janet.

I work on compiler and systems projects, especially around Rust-GCC/gccrs, IR infrastructure, and performance optimization.

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Contact

Feel free to reach out by email, GitHub, or LinkedIn.

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