Uploaded June 2026 | Updated September 2026, 2 weeks ago

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2026 EuroLLVM Developers' Meeting
llvm.org/devmtg/2026-04
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Title: Floating-Point Types in MLIR: Infrastructure, New Types and Dialect Design
Speaker: Matthias Springer
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Slides: llvm.org/devmtg/2026-04/slides/technical_talk/technical_talk_springer.pdf
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This technical talk summarizes recent improvements to MLIR's floating-point type infrastructure, focusing on how to represent and lower the rapidly growing zoo of low-precision and block-scaled formats used in modern ML workloads.

It introduces the FloatTypeInterface, explains the interaction with LLVM's APFloat and fltSemantics, and shows step-by-step how to add new floating-point types, from extending APFloat to defining lowering rules and dialect design for special FP types across high-level and low-level dialects.

The talk also covers the new arith-to-apfloat infrastructure for software emulation of low-precision FP arithmetics on CPUs, discusses current limitations of adding FP types without patching LLVM, and outlines future directions for more extensible, vendor-friendly floating-point type systems in MLIR.
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