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https://issues.apache.org/jira/browse/HIVE-10180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14491819#comment-14491819
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Chengxiang Li commented on HIVE-10180:
--------------------------------------
Committed to trunk, thanks Gopal for review.
> Loop optimization for SIMD 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, HIVE-10180.2.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.
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