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: Deep Dive into the MLIR to LLVM IR Translation Mechanism

Speaker: Alex Zinenko

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Slides: llvm.org/devmtg/2025-04/slides/keynote/zinenko_deep_dive.pdf

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MLIR is now an inherent part of the LLVM compiler infrastructure, but what connects the two representations? In theory, the conceptual similarity of the core representation. In practice, a highly important, yet often overlooked, module translation subsystem. This talk will present the multi- dialect translation mechanism available in MLIR to target LLVM IR, explain how to use it for a custom dialect, and argue why it may not always be the best idea. It will also discuss interoperability between MLIR and LLVM IR functions, including ABI for built-in types and calling conventions.

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