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From "Matt McCline (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11457) Vectorization: Improve SIMD JIT in GenVectorCode StringExpr instrinsics
Date Thu, 06 Aug 2015 03:10:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14659399#comment-14659399
] 

Matt McCline commented on HIVE-11457:
-------------------------------------

+1 correctness lgtm

> Vectorization: Improve SIMD JIT in GenVectorCode StringExpr instrinsics 
> ------------------------------------------------------------------------
>
>                 Key: HIVE-11457
>                 URL: https://issues.apache.org/jira/browse/HIVE-11457
>             Project: Hive
>          Issue Type: Improvement
>          Components: Vectorization
>    Affects Versions: 2.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>             Fix For: 2.0.0
>
>         Attachments: HIVE-11457.1.patch, string-intrinsic-sse.png
>
>
> With HIVE-11406, the Vectorization codegen generates a new and specialized fast-path
for equality (and non equality), which removed the ordering and comparison constraints in
the old codepath.
> The equality operation can be much more pipeline and cache line efficient by keeping
on comparing even when an inequality has been detected.
> Optimize the single loop into a pair of loops, to allow the Vectorization codegen to
use tighter loops that the JIT superword optimization can understand.
> !string-intrinsic-sse.png!



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