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Posted to issues@arrow.apache.org by "Uwe L. Korn (JIRA)" <ji...@apache.org> on 2017/02/06 13:27:41 UTC

[jira] [Commented] (ARROW-536) [C++] Provide non-SSE4 versions of functions that use CPU intrinsics for older processors

    [ https://issues.apache.org/jira/browse/ARROW-536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15853982#comment-15853982 ] 

Uwe L. Korn commented on ARROW-536:
-----------------------------------

The current code (as in ARROW-33) will compile and work on non-SSE4 system but the {{popcnt}} instruction will only be used by the compiler if the flag {{-msse4.2}} is provided. We would need rather two variants of specific functions compiled, one with SSE4.2 instructions and one without. Loading the correct one must be resolved at runtime.

> [C++] Provide non-SSE4 versions of functions that use CPU intrinsics for older processors
> -----------------------------------------------------------------------------------------
>
>                 Key: ARROW-536
>                 URL: https://issues.apache.org/jira/browse/ARROW-536
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Wes McKinney
>
> follow up to discussion in patch for ARROW-33



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