Alexandros Lamprineas
Compiler Performance Engineer at Arm
Cambridge, England, United Kingdom
Summary
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Rockstar🎓
Top SchoolAlexandros Lamprineas is a Compiler Performance Engineer with a decade of hands-on experience improving LLVM/Clang backends and toolchains, currently advancing compiler performance at Arm in Cambridge. He has deep AArch64 and ARM expertise—refactoring Function Multi-Versioning, fixing CPU feature initialization, and implementing ACLE 2.0 macros—to ensure accurate code generation across ARM profiles. His path from research roles at Inria and ICS-FORTH to production toolchain engineering at Arm reflects a strong mix of academic rigor (MSc in Parallel & Distributed Systems) and practical compiler engineering. An active contributor to the widely used llvm-project and clang mirrors, he focuses on subtle, high-impact backend changes that improve correctness and performance rather than surface features.
10 years of coding experience
12 years of employment as a software developer
Bachelor's Degree, Computer Science, 7.23 out of 10, Bachelor's Degree, Computer Science, 7.23 out of 10 at University of Crete, Department of Computer Science, Heraklion, Greece
English, Greek, French
Github Skills (20)
assembly10
architecture10
llvm10
c1110
c1710
code-generation10
compiler-compiler10
cplus10
assemble10
assembler10
compiler-optimization10
arm10
compiler10
cpp10
architectures10
Programming languages (5)
Github contributions (5)
llvm/llvm-project
Jan 2023 - Jan 2023
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:232 reviews, 1 commit, 158 PRs in 1 day
Contributions summary:Alexandros's contributions primarily involve modifications to the LLVM compiler project's AArch64 backend, specifically concerning the Function Multi-Versioning (FMV) feature and architecture-specific features. Their work includes refactoring the API for FMV feature priority, removing obsolete features, and adding feature dependencies. The user also addressed build and integration issues with the compiler-rt, by fixing CPU features initialization and ensuring streaming mode compatibility. These contributions indicate a focus on enhancing the AArch64 code generation and overall performance of the compiler.
compilerstechnologiesclangsubmittoolchain
llvm-mirror/clang
Jul 2015 - Jul 2019
Mirror kept for legacy. Moved to https://github.com/llvm/llvm-project
Role in this project:Back-end Developer
Back-end DeveloperContributions:19 commits in 4 years 1 month
Contributions summary:Alexandros refactored and modified ARMTargetInfo within the Clang compiler, specifically focusing on ARM architecture-related information. Their work included integrating the API of llvm/lib/Support/TargetParser.cpp for extracting target-specific details and implementing ACLE 2.0 macros, demonstrating in-depth knowledge of ARM architecture and compiler internals. The user also addressed bugs related to target feature handling and configuration, ensuring accurate compilation for various ARM CPU profiles. These changes enhanced the compiler's ability to target ARM processors correctly.
keptwindowsllvmcc-plus-plus
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