You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@hive.apache.org by "Chengxiang Li (JIRA)" <ji...@apache.org> on 2015/04/02 05:33:52 UTC
[jira] [Updated] (HIVE-10180) Loop optimization in
ColumnArithmeticColumn.txt
[ https://issues.apache.org/jira/browse/HIVE-10180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chengxiang Li updated HIVE-10180:
---------------------------------
Attachment: HIVE-10180.1.patch
> Loop optimization in ColumnArithmeticColumn.txt
> -----------------------------------------------
>
> Key: HIVE-10180
> URL: https://issues.apache.org/jira/browse/HIVE-10180
> Project: Hive
> Issue Type: Sub-task
> Reporter: Chengxiang Li
> Assignee: Chengxiang Li
> Priority: Minor
> Attachments: HIVE-10180.1.patch
>
>
> JVM is quite strict on the code schema which may executed with SIMD instructions, take a loop in DoubleColAddDoubleColumn.java for example,
> {code:java}
> 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 message was sent by Atlassian JIRA
(v6.3.4#6332)