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SIMD Harley-Seal Population Count #165

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saik0 opened this issue Jan 30, 2022 · 3 comments
Closed

SIMD Harley-Seal Population Count #165

saik0 opened this issue Jan 30, 2022 · 3 comments

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@saik0
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saik0 commented Jan 30, 2022

arXiv:1709.07821 Roaring Bitmaps: Implementation of an Optimized Software Library (Section 4.1.1)

arXiv:1611.07612 Faster Population Counts Using AVX2 Instructions

Our approach has been adopted by LLVM: it is used by its popular C compiler (clang).

Is this already done?
@Kerollmops
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I am pretty sure it hasn't been implemented.

@saik0 saik0 mentioned this issue Jan 30, 2022
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@saik0
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saik0 commented Jan 30, 2022

Our approach has been adopted by LLVM: it is used by its popular C compiler (clang).

llvm might be doing it for us :)

@saik0
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saik0 commented Jan 30, 2022

It does. Both for counting cardinality, and for counting while performing a set op.

https://godbolt.org/z/EKb3qvj5T

@saik0 saik0 closed this as completed Jan 30, 2022
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@saik0 @Kerollmops