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Posted to issues-all@impala.apache.org by "Sebastian Pop (Jira)" <ji...@apache.org> on 2023/09/18 17:47:00 UTC

[jira] [Resolved] (IMPALA-12449) SSE2NEON is slow compared to native NEON code

     [ https://issues.apache.org/jira/browse/IMPALA-12449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Pop resolved IMPALA-12449.
------------------------------------
    Resolution: Fixed

> SSE2NEON is slow compared to native NEON code
> ---------------------------------------------
>
>                 Key: IMPALA-12449
>                 URL: https://issues.apache.org/jira/browse/IMPALA-12449
>             Project: IMPALA
>          Issue Type: Bug
>    Affects Versions: Impala 4.3.0
>            Reporter: Sebastian Pop
>            Assignee: Sebastian Pop
>            Priority: Critical
>             Fix For: Impala 4.3.0
>
>
> The port to arm64 uses https://github.com/DLTcollab/sse2neon an automatic tool to convert x86_64 intrinsics to arm64 NEON.
> As some of the x86_64 vector instructions do not have a one-to-one translation to NEON, the sse2neon translation tool falls back to a sequential emulation of the missing instructions.
> To avoid those slow paths, we need to adapt to NEON instructions all the code-paths with x86_64 intrinsics.



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