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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-57726] ZigZag encoder/decoder for signed 32bit and 64bit integer</title>
                <link>https://jira.mongodb.org/browse/SERVER-57726</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Add a &quot;ZigZag&quot; encoder for signed integers that stores the sign bit as the least significant bit. Two&apos;s complement is using the most significant bit resulting in a large bit difference for -1 vs 0.&lt;/p&gt;

&lt;p&gt;With ZigZag, Simple-8b encoder does then not have to know about signed integers and can treat everything as unsigned.&lt;/p&gt;

&lt;p&gt;For 32bit integers ZigZag encoding would look like this:&lt;br/&gt;
 zigzag = (n &amp;lt;&amp;lt; 1) ^ (n &amp;gt;&amp;gt; 31)&lt;/p&gt;</description>
                <environment></environment>
        <key id="1783844">SERVER-57726</key>
            <summary>ZigZag encoder/decoder for signed 32bit and 64bit integer</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="luke.bhan@mongodb.com">Luke Bhan</assignee>
                                    <reporter username="jackson.xie@mongodb.com">Jackson Xie</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Jun 2021 20:38:18 +0000</created>
                <updated>Sun, 29 Oct 2023 21:52:09 +0000</updated>
                            <resolved>Fri, 2 Jul 2021 18:38:54 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="4107661" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:32:42 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3915747" author="xgen-internal-githook" created="Sat, 3 Jul 2021 10:58:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57726&quot; title=&quot;ZigZag encoder/decoder for signed 32bit and 64bit integer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57726&quot;&gt;&lt;del&gt;SERVER-57726&lt;/del&gt;&lt;/a&gt; Fix bson_util_test with ASAN builder: left shift of negative value -1&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aa2ac023376c13d73ead07155abd0bbb67955a09&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aa2ac023376c13d73ead07155abd0bbb67955a09&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3915187" author="xgen-internal-githook" created="Fri, 2 Jul 2021 19:04:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;lukebhan&apos;, &apos;email&apos;: &apos;luke.bhan@vanderbilt.edu&apos;, &apos;username&apos;: &apos;lukebhan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57726&quot; title=&quot;ZigZag encoder/decoder for signed 32bit and 64bit integer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57726&quot;&gt;&lt;del&gt;SERVER-57726&lt;/del&gt;&lt;/a&gt; Added signed integer encoding to simple8b&lt;/p&gt;

&lt;p&gt;changed decode to use or&lt;/p&gt;

&lt;p&gt;updated zigzag&lt;/p&gt;

&lt;p&gt;removed iostream&lt;/p&gt;

&lt;p&gt;removed debug code&lt;/p&gt;

&lt;p&gt;replace negate with 2&apos;s complement&lt;/p&gt;

&lt;p&gt;fixed linter&lt;/p&gt;

&lt;p&gt;linter&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8544eebc9bf29710bb4158237e72bcd825466e23&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8544eebc9bf29710bb4158237e72bcd825466e23&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1783842">SERVER-57725</issuekey>
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