[jira] [Updated] (HIVE-11521) Loop optimization for SIMD in logical operators

["Teddy Choi (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-11521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Teddy Choi updated HIVE-11521:
------------------------------
    Attachment: HIVE-11521.patch

> Loop optimization for SIMD in logical operators
> -----------------------------------------------
>
>                 Key: HIVE-11521
>                 URL: https://issues.apache.org/jira/browse/HIVE-11521
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Teddy Choi
>            Assignee: Teddy Choi
>            Priority: Minor
>         Attachments: HIVE-11521.patch
>
>
> JVM is quite strict on the code schema which may executed with SIMD instructions, take a loop in ColOrCol.java for example,
> {code}
> for (int i = 0; i != n; i++) {
>   outputVector[i] = vector1[0] | vector2[i];
> }
> {code}
> The "vector1\[0\]" reference would prevent JVM to execute this part of code with vectorized instructions, we need to assign the "vector1\[0\]" to a variable outside of loop, and use that variable in loop.
> This issues covers AND, OR, NOT logical operators.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)