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: Function multi-versioning: compiler aided function specialization with runtime dispatch.

Speaker: Alexandros Lamprineas

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Slides: llvm.org/devmtg/2025-04/slides/technical_talk/lamprineas_function_multi-versioning.pdf

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We have implemented a new compiler feature for AArch64 and we need user feedback to further develop/refine it. Function Multi Versioning (FMV) lets the compiler generate multiple function versions and auto-dispatch between them. This is useful when running your code on CPUs which implement optional instructions that are not guaranteed to be present on the target of compilation.

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