Nathan Sidwell
Principal Compiler Engineer at Tenstorrent
Massachusetts, United States
Summary
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Rockstar🎓
Top SchoolNathan Sidwell is a Principal Compiler Engineer with 27 years of experience specializing in C++ language implementation and compiler toolchains. He has deep, hands‑on expertise across GCC and LLVM—working on frontends, backends, linkers and debuggers—and has driven significant projects such as GCC's OpenACC middle-end and C++20 Modules. A long‑standing contributor to high‑visibility projects like clang/LLVM and GCC, he routinely fixes subtle template deduction, name lookup and module semantics bugs that require deep language and toolchain knowledge. He has held senior engineering and leadership roles at Tenstorrent, MediaTek, Meta (Facebook), Mentor Graphics and CodeSourcery, bridging academic rigor (PhD in Physics) with production compiler engineering. As a member of the BSI C++ panel and the ISO C++ committee, he influences language evolution as well as its implementations. Based in Massachusetts, he combines low‑level systems optimization experience (e.g., BOLT work in LLVM) with a knack for refactoring complex compiler internals for maintainability.
28 years of coding experience
26 years of employment as a software developer
Doctorate Physics, Doctorate Physics at University of Bristol
Github Skills (25)
c-language10
relocate10
llvm10
bolt10
internals10
html-template10
python-templates10
binarydiff10
migration10
x8610
code-templates10
apptemplates10
compiler-design10
compiler-compiler10
x86-6410
Programming languages (7)
Github contributions (5)
gcc-mirror/gcc
Jan 2017 - Feb 2021
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2012 commits in 4 years 1 month
Contributions summary:Nathan's commits are focused on improving the C++ compiler, specifically within the context of name lookup, module support, and template handling. Their work involves refactoring existing code for greater clarity and maintainability, and implementing new functionality such as support for various module-related features. The commits demonstrate a deep understanding of C++ language semantics and the internals of the compiler.
llvm/llvm-project
Feb 2022 - Feb 2022
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
Role in this project:Back-end Developer
Back-end DeveloperContributions:30 reviews, 2 commits, 88 PRs in 5 days
Contributions summary:Nathan primarily worked on refactoring and improving the LLVM compiler toolchain, specifically focusing on the BOLT (Binary Optimization and Layout Tools) component. Their contributions involved optimizing code related to relocation, section handling, and branch instructions, aiming for enhanced performance and efficiency. They also made adjustments to the TBAA (Type-Based Alias Analysis) and clang-format settings. The user demonstrated expertise in low-level system programming and compiler internals by modifying core components of the LLVM project.
compilerllvmtoolchain
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