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    <title>MongoDB Jira</title>
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    <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-76917] Avoid redundant bounds check in field_ref</title>
                <link>https://jira.mongodb.org/browse/SERVER-76917</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;FieldRef::getPart() gets called a lot; even moreso due to commit 851cfd2d . I observed that in &lt;a href=&quot;https://github.com/10gen/mongo/blob/1c5aac135c035b7a7278a2dc49b44aa371e1cd1b/src/mongo/db/field_ref.cpp#L194-L197&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/1c5aac135c035b7a7278a2dc49b44aa371e1cd1b/src/mongo/db/field_ref.cpp#L194-L197&lt;/a&gt; we check the bounds on _parts, but _parts is a boost::container::small_vector which already does a bounds check in operator[](): &lt;a href=&quot;https://github.com/10gen/mongo/blob/4973ef272c16f83e855c0d8ab5c9c2dc0d47d39f/src/third_party/boost/boost/container/vector.hpp#L1654&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/blob/4973ef272c16f83e855c0d8ab5c9c2dc0d47d39f/src/third_party/boost/boost/container/vector.hpp#L1654&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;So we can remove that invariant check and save ~5%.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2334920">SERVER-76917</key>
            <summary>Avoid redundant bounds check in field_ref</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="colin.stolley@mongodb.com">Colin Stolley</assignee>
                                    <reporter username="colin.stolley@mongodb.com">Colin Stolley</reporter>
                        <labels>
                    </labels>
                <created>Mon, 8 May 2023 16:39:22 +0000</created>
                <updated>Sun, 29 Oct 2023 21:21:51 +0000</updated>
                            <resolved>Mon, 15 May 2023 16:14:24 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5422351" author="xgen-internal-githook" created="Fri, 12 May 2023 23:54:42 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Colin Stolley&apos;, &apos;email&apos;: &apos;ccstolley@github.com&apos;, &apos;username&apos;: &apos;ccstolley&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76917&quot; title=&quot;Avoid redundant bounds check in field_ref&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76917&quot;&gt;&lt;del&gt;SERVER-76917&lt;/del&gt;&lt;/a&gt;: Avoid redundant bounds check&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7992126f7852d313c549e322140b0a4808c92194&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7992126f7852d313c549e322140b0a4808c92194&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5410045" author="xgen-internal-githook" created="Mon, 8 May 2023 23:19:06 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Colin Stolley&apos;, &apos;email&apos;: &apos;ccstolley@github.com&apos;, &apos;username&apos;: &apos;ccstolley&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76917&quot; title=&quot;Avoid redundant bounds check in field_ref&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76917&quot;&gt;&lt;del&gt;SERVER-76917&lt;/del&gt;&lt;/a&gt;: Avoid redundant bounds check&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4b505027e41823ae3dabeb56f8fe435c4baa8861&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4b505027e41823ae3dabeb56f8fe435c4baa8861&lt;/a&gt;&lt;/p&gt;</comment>
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