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LLVM Fortran Compiler Flang: A Decade in the Making, Officially Released

2025-03-12

After nearly a decade of development, the LLVM Fortran compiler, Flang, has finally been officially renamed from "flang-new" to "flang." This article recounts Flang's journey, from its initial development by the US National Labs and NVIDIA, to its adoption of LLVM's Multi-Level Intermediate Representation (MLIR), and its eventual integration into the LLVM project. Flang's creation aimed to provide a long-term, non-proprietary Fortran compiler, mitigating risks associated with single-point failures, and fostering growth within the Fortran community. Flang's journey also showcases advancements in compiler technology, such as the use of MLIR for optimizing Fortran code. Now mature and stable, with support from vendors like AMD, Flang stands as a powerful tool for Fortran developers.

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Lightstorm: A Minimalistic Ruby Compiler Boosts Performance with MLIR

2024-12-31

The DragonRuby team developed Lightstorm, a minimalistic Ruby compiler aimed at improving the performance of their cross-platform game engine. Leveraging MLIR, Lightstorm translates mruby VM bytecode into C code, optimizing performance by eliminating load/store and branch operations within the VM's interpreter loop. Benchmark results show performance improvements ranging from 1% to 1200%, with an average reduction of roughly 30% in execution time and cycles. While currently supporting a subset of Ruby, the project validates the feasibility of pre-compiling Ruby code for performance gains. Future plans include replacing critical C components of the engine with compiled Ruby code.