Brandon Wu
Software Engineer at SiFive, Inc.
Taiwan, United States
Summary
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RockstarBrandon Wu is a software engineer with eight years of hands-on experience specializing in compiler backend engineering, particularly within the LLVM ecosystem. Based in Taiwan with ties to the United States, he has made substantive contributions to the RISC‑V LLVM project—refactoring frame lowering, fixing vector calling convention edge cases, and ensuring correct CFI emission for callee‑saved vector registers to improve debugging and stack unwinding. His work shows a strong focus on both correctness and performance, removing redundant operations and tightening prologue/epilogue generation. Known on GitHub as a compiler engineer, he combines low-level systems expertise with a pragmatic attention to maintainability and efficiency.
8 years of coding experience
Github Skills (8)
risc-v10
compiler-design10
vectorization10
llvm10
assemble9
assembler9
assembly9
code-optimization9
Programming languages (9)
Github contributions (5)
llvm/llvm-project
Mar 2022 - Jun 2026
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:360 reviews, 240 PRs, 150 pushes in 4 years 4 months
Contributions summary:Brandon primarily contributed to the RISC-V LLVM project by addressing and correcting issues related to the vector calling convention, specifically concerning the handling of return types and the implementation of the VLS (Variable Length Scalar) calling convention. They refactored the code related to frame lowering, including the prologue and epilogue, and ensured that the compiler correctly emitted CFI (Call Frame Information) for callee-saved vector registers, which improved debugging and stack unwinding. Furthermore, the user worked on optimizing the code by removing unnecessary multiplications and other redundancies, demonstrating a focus on code efficiency and performance.
compilerllvmtoolchain
4vtomat/llvm-project
Sep 2023 - Jul 2026
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
Contributions:327 pushes, 264 branches in 2 years 10 months
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