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    <title>MongoDB Jira</title>
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    <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-55043] canonicalizeBSONType() should be implemented as a lookup table</title>
                <link>https://jira.mongodb.org/browse/SERVER-55043</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I noticed it was showing up as hot in some profiles. Making it a lookup table makes it basically disappear.  I&apos;m attaching a patch for how I did it.&lt;/p&gt;

&lt;p&gt;It may make sense to move the table construction out of line (I don&apos;t know if we are ever getting any benefit from calling this on a known-constant value), but the lookup should probably stay inline since it is just 2-3 instructions (possibly compute the address of the table using rip-relative addressing, sign extend the type, do the lookup). Canonicalizing 2 types (as is usually done) takes only 5 instructions because the actual table address only needs to be computed once.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1643473">SERVER-55043</key>
            <summary>canonicalizeBSONType() should be implemented as a lookup table</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>newgrad</label>
                    </labels>
                <created>Mon, 8 Mar 2021 17:42:07 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:34 +0000</updated>
                            <resolved>Fri, 14 Jan 2022 17:45:25 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                    <component>Internal Code</component>
                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4293618" author="xgen-internal-githook" created="Fri, 14 Jan 2022 17:36:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55043&quot; title=&quot;canonicalizeBSONType() should be implemented as a lookup table&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55043&quot;&gt;&lt;del&gt;SERVER-55043&lt;/del&gt;&lt;/a&gt; Implement canonicalizeBSONType as a lookup table&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2e26b975e18359c17fd6e0537b69938ef4c75310&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2e26b975e18359c17fd6e0537b69938ef4c75310&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3653931" author="redbeard0531" created="Tue, 9 Mar 2021 10:25:10 +0000"  >&lt;p&gt;I replaced the patch with a cleaner one. It does all indexing with &lt;tt&gt;uint8_t&lt;/tt&gt; so it generates equally good code without needing to work around &lt;a href=&quot;https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99470&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99470&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="303940" name="canonBsonType.patch" size="2555" author="mathias@mongodb.com" created="Tue, 9 Mar 2021 10:23:42 +0000"/>
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