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 BIR Drop-state analysis for straight-line and conditional control flow, then connected it to backend cleanup with Drop flags for supported whole-local moves.
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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