Roger Ibáñez
Research Engineer at Barcelona Supercomputing Center
Barcelona, Catalonia, Spain
Summary
🤩
Rockstar🎓
Top SchoolRoger Ibáñez is a Research Engineer with 20 years of experience specializing in compilers, programming languages, and low-level optimization, currently coordinating the Compiler & Toolchains for High Performance Computing group at the Barcelona Supercomputing Center. He bridges software and hardware, applying deep compiler backend expertise—particularly for LLVM/Clang and RISC-V targets—to enable high-performance systems and user-facing tooling. His contributions include adding SelectionDAG nodes, implementing RISC-V trampolines, and custom lowering for llvm.clear_cache, reflecting hands-on influence in one of the flagship open-source compiler projects. Trained in computer architecture and networks at Universitat Politècnica de Catalunya, he combines academic rigor with practical systems work and a knack for making complex architectures accessible to developers.
20 years of coding experience
UPC Universitat Politècnica de Catalunya
English, Spanish, Catalan
Github Skills (15)
c1710
risc-v10
compiler10
compiler-design10
compiler-compiler10
c-language10
code-generation10
cprogramming-language10
c1110
assembler10
llvm10
assemble9
cplus9
assembly9
cpp9
Programming languages (9)
Github contributions (5)
llvm/llvm-project
Nov 2019 - Feb 2025
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:34 reviews, 13 PRs, 29 pushes in 5 years 4 months
Contributions summary:Roger primarily contributes to the LLVM project by implementing and modifying code related to the SelectionDAG and RISC-V target. Their work includes introducing new nodes like `CLEAR_CACHE`, which involved changes in `ISDOpcodes.h`, `TargetLoweringBase.cpp`, and other relevant files. Additionally, the user implemented support for RISC-V trampolines, including custom lowering for `llvm.clear_cache` on Linux targets to `__riscv_flush_icache`. This involved modifications to `RISCVISelLowering.cpp`, and associated test files.
compilerstechnologiesclangsubmittoolchain
llvm-mirror/clang
Sep 2018 - Sep 2019
Mirror kept for legacy. Moved to https://github.com/llvm/llvm-project
Role in this project:Back-end Developer
Back-end DeveloperContributions:7 commits in 1 year
Contributions summary:Roger primarily contributed to the RISC-V target support within the Clang compiler. Their work involved modifying the driver and assembler to correctly handle target ABIs, specifically related to the RISC-V architecture. They also made changes to default ABI settings and moved architecture-specific parsing logic into its own function. These changes improve the compiler's support for different RISC-V configurations and target features.
keptwindowsllvmcc-plus-plus
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