Uploaded May 2025 | Updated September 2026, 2 weeks ago

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2025 EuroLLVM Developers' Meeting

llvm.org/devmtg/2025-04

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Title: Leveraging "nsw" in Flang's LLVM IR Generation for Vectorization

Speaker: Yusuke Minato

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Slides: llvm.org/devmtg/2025-04/slides/quick_talk/minato_nsw.pdf

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Flang is the Fortran frontend in the LLVM project. Its quality and performance have been improving, so that its driver has been renamed from "flang-new" to "flang" since LLVM 20. With respect to optimizations, loop vectorization plays an important role because it can reduce the number of operations in a loop by half or more. This talk focuses on Flang's capability of vectorization in the backend and our work on "nsw" to improve the capability. As a result of our work, loop vectorization for Fortran has been enhanced by introducing several options related to integer overflow into Flang.

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