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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9707) Fix register lists for crc32c inline assembly
Date Mon, 15 Jul 2013 18:26:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13708778#comment-13708778
] 

Hudson commented on HADOOP-9707:
--------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #4084 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/4084/])
HADOOP-9707. Fix register lists for crc32c inline assembly. Contributed by Todd Lipcon. (kihwal:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1503390)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/bulk_crc32.c

                
> Fix register lists for crc32c inline assembly
> ---------------------------------------------
>
>                 Key: HADOOP-9707
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9707
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: util
>    Affects Versions: 3.0.0, 2.1.0-beta
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>             Fix For: 3.0.0, 2.1.0-beta
>
>         Attachments: hadoop-9707.txt
>
>
> The inline assembly used for the crc32 instructions has an incorrect clobber list: the
computed CRC values are "in-out" variables and thus need to use the "matching constraint"
syntax in the clobber list.
> This doesn't seem to cause a problem now in Hadoop, but may break in a different compiler
version which allocates registers differently, or may break when the same code is used in
another context.

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