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https://issues.apache.org/jira/browse/ARROW-13677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17495854#comment-17495854
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Yibo Cai commented on ARROW-13677:
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Looks compiler is able to vectorize the naive implementation on
{{avx2/avx512/neon}}, both for unpack32 and unpack64.
[https://godbolt.org/z/jrz95vrsY]
Compiler doesn't vectorize for {{sse4.2}}, probably it believes the vectorized
code is no better than the scalar one.
> [C++] Improve performance of unpack64
> -------------------------------------
>
> Key: ARROW-13677
> URL: https://issues.apache.org/jira/browse/ARROW-13677
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Antoine Pitrou
> Priority: Major
>
> unpack32 benefits from auto-generated SIMD optimizations, but unpack64
> doesn't. The latter is used by Parquet for DELTA_BINARY_PACKED encoding.
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