Uploaded November 2025 | Updated September 2026, 2 weeks ago

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2025 US LLVM Developers' Meeting

llvm.org/devmtg/2025-10

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Title: Can Vectorization Slow Down Performance? Addressing the Challenges of Vectorizing Stride Access

Speaker: Kotaro Kinoshita

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Slides: llvm.org/devmtg/2025-10/slides/lightning_talks/kinoshita.pdf

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TSVC is a benchmark designed to measure the vectorization capabilities of compilers. In one of its test cases, s128, it has been discovered that vectorization in LLVM can cause performance degradation under certain conditions. We found that this degradation is caused by vectorizing strided access, and such issues occur even in simple cases. This talk will present potential LLVM improvements for vectorizing strided access and discuss future directions for enhancing its performance.

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