2026 EuroLLVM - Improving DemandedBits Analysis for Shift Operations in LLVM

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2026 EuroLLVM Developers' Meeting

https://llvm.org/devmtg/2026-04/

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Title: Improving DemandedBits Analysis for Shift Operations in LLVM

Speaker: Panagiotis Karouzakis

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Slides: https://llvm.org/devmtg/2026-04/slides/lightning_talk/lightning_talk_karouzakis.pdf

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The DemandedBits analysis is utilized in some optimization passes, such as vectorization and dead code elimination; a similar analysis is employed in InstCombine. We improve DemandedBits reasoning for all basic shift operations, enabling more precise bit-level information propagation. Our improvements reduced code size, enabled additional loop-invariant code motion, and lead to more instruction-level simplifications.

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