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Add avx512 implementation#79

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Jorropo wants to merge 16 commits intocespare:maincespare/xxhash:mainfrom Jorropo:avx512Jorropo/xxhash:avx512Copy head branch name to clipboard

+425-104

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Commits on May 8, 2024

• add support for avx512 on Sum64

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• add avx512 routines for writeBlocks (thus Digest)

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• rework Digest.mem to be passed as side array

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Commits on Jun 18, 2024

• move generation to it's own submodule

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• tweak CPUID so AVX512 impl only runs on amd

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• clarify useAvx512 in arm64

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• simplify extra handling in generic writeBlocks

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Commits on Jun 20, 2024

• implement slide sum for amd64 fallback

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• change gen/go.mod to use a more reasonable go.mod version

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• add very unsubtle bounds hints to the compiler in the slide

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• manually inline u64 and u32 in the slide to work around go bug.

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• fix file leak in gen/slide.go

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• manually inline functions in the slide

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• fix slidegen so it outputs go fmted code

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• remove slide and handle jump in avx512

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• gate avx512 behind go1.22

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