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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-38623] Make safeNumberLongForHash consistent between PPC and other architectures</title>
                <link>https://jira.mongodb.org/browse/SERVER-38623</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As noted in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37183&quot; title=&quot;BSONElement::safeNumberLong is not safe&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37183&quot;&gt;&lt;del&gt;SERVER-37183&lt;/del&gt;&lt;/a&gt;, the hash function used for double values performs an undefined cast when hashing the value 2^63, and the resulting value is different on PPC than on other supported platforms. We should make this hash value consistent across architectures, but before we do that, we need a path for existing PPC installations to rehash any documents with a hashed index key that includes a 2^63 double value.&lt;/p&gt;</description>
                <environment></environment>
        <key id="653495">SERVER-38623</key>
            <summary>Make safeNumberLongForHash consistent between PPC and other architectures</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="justin.seyster@mongodb.com">Justin Seyster</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Dec 2018 21:27:18 +0000</created>
                <updated>Sun, 29 Oct 2023 22:25:43 +0000</updated>
                            <resolved>Wed, 3 Apr 2019 20:10:30 +0000</resolved>
                                                    <fixVersion>4.1.10</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2201058" author="xgen-internal-githook" created="Wed, 3 Apr 2019 19:30:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;justin.seyster@mongodb.com&apos;, &apos;name&apos;: &apos;Justin Seyster&apos;, &apos;username&apos;: &apos;jseyster&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38623&quot; title=&quot;Make safeNumberLongForHash consistent between PPC and other architectures&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38623&quot;&gt;&lt;del&gt;SERVER-38623&lt;/del&gt;&lt;/a&gt; Make safeNumberLongForHash consistent on all platforms&lt;/p&gt;

&lt;p&gt;Previously, the hash function for double values relied on undefined&lt;br/&gt;
behavior when computing the hash for 2^63, meaning that it could give&lt;br/&gt;
different results on different platforms. Almost all platforms we&lt;br/&gt;
support returned -2^63 as the result of safeNumberLongForHash when the&lt;br/&gt;
input was 2^63, so this patch makes that the official result. Now,&lt;br/&gt;
safeNumberLongForHash will explicitly convert 2^63 to -2^63 on &lt;em&gt;all&lt;/em&gt;&lt;br/&gt;
platforms without invoking any undefined behavior.&lt;/p&gt;

&lt;p&gt;Note that this does not change our guidance that using a hashed index&lt;br/&gt;
for a field containing a floating point value greater than 2^53 is&lt;br/&gt;
unsupported:&lt;br/&gt;
&lt;a href=&quot;https://docs.mongodb.com/manual/core/index-hashed/#considerations&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/index-hashed/#considerations&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f2ab9fa71aabf110b67c28131241de6a27a3f09e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f2ab9fa71aabf110b67c28131241de6a27a3f09e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2112609" author="justin.seyster" created="Fri, 11 Jan 2019 18:26:25 +0000"  >&lt;p&gt;This is no longer just a PPC issue: I observed that gcc 8.2 on x86-64 Linux also has different behavior for this cast than other compilers.&lt;/p&gt;</comment>
                    </comments>
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                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="734219">DOCS-12610</issuekey>
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            <issuekey id="606452">SERVER-37183</issuekey>
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