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https://issues.apache.org/jira/browse/IMPALA-8741?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Becker updated IMPALA-8741:
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Attachment: demo3.png
> Speed up bit unpacking by vectorisation
> ---------------------------------------
>
> Key: IMPALA-8741
> URL: https://issues.apache.org/jira/browse/IMPALA-8741
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Daniel Becker
> Assignee: Daniel Becker
> Priority: Major
> Attachments: demo3.png
>
>
> Using compiler intrinsics for SIMD and bit manipulation instructions (AVX,
> AVX2 and BMI2), we can speed up bit unpacking by a factor of about 2 to 8
> depending on bit width, at most 16.
> We need to take care to check that the required instructions are supported by
> the CPU the impalad is running on and fall back to the scalar implementation
> if not.
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