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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-27542] Investigate the need for volatile in src/mongo/db/geo/shapes.cpp in 32-bit code</title>
                <link>https://jira.mongodb.org/browse/SERVER-27542</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The code here:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/241b64c7bffb9c8cadc9b1a01844833218b0c8f0/src/mongo/db/geo/shapes.cpp#L496-L505&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/241b64c7bffb9c8cadc9b1a01844833218b0c8f0/src/mongo/db/geo/shapes.cpp#L496-L505&lt;/a&gt;&lt;br/&gt;
uses volatile to work around a 32-bit gcc compiler bug. This change was originally added in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2940&quot; title=&quot;Double precision errors on linux 32 bit builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2940&quot;&gt;&lt;del&gt;SERVER-2940&lt;/del&gt;&lt;/a&gt;, but with the migration to GCC 5.4.0, this workaround needs to be evaluated if it it is still necessary, and can be removed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="341585">SERVER-27542</key>
            <summary>Investigate the need for volatile in src/mongo/db/geo/shapes.cpp in 32-bit code</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-platform">DO NOT USE - Backlog - Platform Team</assignee>
                                    <reporter username="mark.benvenuto@mongodb.com">Mark Benvenuto</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Dec 2016 19:08:37 +0000</created>
                <updated>Fri, 16 Jun 2017 18:36:10 +0000</updated>
                            <resolved>Fri, 16 Jun 2017 18:36:10 +0000</resolved>
                                    <version>3.5.1</version>
                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1599547" author="acm" created="Fri, 16 Jun 2017 18:36:10 +0000"  >&lt;p&gt;We no longer offer 32-bit builds of MongoDB.&lt;/p&gt;</comment>
                            <comment id="1468332" author="geert.bosch" created="Tue, 3 Jan 2017 17:24:39 +0000"  >&lt;p&gt;There was no &quot;gcc compiler bug&quot;. The (misguided) use of volatile was most likely added to avoid missing rounding due to the use of extended precision x87 registers for double precision values, trading a missing rounding for a double rounding. Anybody concerned with consistent rounding on 32-bit x86 should use an SSE2-capable processor (Intel Pentium-4 or later, or any 64-bit capable x86 CPU) and invoke GCC with the required options to allow it to compile SSE2-specific code (rather than generic 386 compatible IA32 code).&lt;/p&gt;

&lt;p&gt;So, we should just remove the volatile here.&lt;/p&gt;</comment>
                            <comment id="1466665" author="schwerin" created="Thu, 29 Dec 2016 19:52:06 +0000"  >&lt;p&gt;This is a super minor nit, but I&apos;m not sure that the compiler behavior was technically a &quot;bug&quot;. The compiler may be allowed by the C++ standard to do exactly what it did. However, I&apos;m not sure whether the &quot;volatile&quot; keyword or just storing the intermediate result into a variable was the necessary step to avoid the behavior.&lt;/p&gt;</comment>
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