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perl5258delta.html
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<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<link rev="made" href="mailto:[email protected]" />
</head>
<body style="background-color: white">
<ul id="index">
<li><a href="#NAME">NAME</a></li>
<li><a href="#DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#Core-Enhancements">Core Enhancements</a>
<ul>
<li><a href="#New-Hash-Function-For-64-bit-Builds">New Hash Function For 64-bit Builds</a></li>
</ul>
</li>
<li><a href="#Performance-Enhancements">Performance Enhancements</a></li>
<li><a href="#Modules-and-Pragmata">Modules and Pragmata</a>
<ul>
<li><a href="#Updated-Modules-and-Pragmata">Updated Modules and Pragmata</a></li>
</ul>
</li>
<li><a href="#Configuration-and-Compilation">Configuration and Compilation</a></li>
<li><a href="#Acknowledgements">Acknowledgements</a></li>
<li><a href="#Reporting-Bugs">Reporting Bugs</a></li>
<li><a href="#SEE-ALSO">SEE ALSO</a></li>
</ul>
<h1 id="NAME">NAME</h1>
<p>perl5258delta - what is new for perl v5.25.8</p>
<h1 id="DESCRIPTION">DESCRIPTION</h1>
<p>This document describes differences between the 5.25.7 release and the 5.25.8 release.</p>
<p>If you are upgrading from an earlier release such as 5.25.6, first read <a href="/cperl/perl5257delta.html">perl5257delta</a>, which describes differences between 5.25.6 and 5.25.7.</p>
<h1 id="Core-Enhancements">Core Enhancements</h1>
<h2 id="New-Hash-Function-For-64-bit-Builds">New Hash Function For 64-bit Builds</h2>
<p>We have switched to a hybrid hash function to better balance performance for short and long keys.</p>
<p>For short keys, 16 bytes and under, we use an optimised variant of One At A Time Hard, and for longer keys we use Siphash 1-3. For very long keys this is a big improvement in performance. For shorter keys there is a modest improvement.</p>
<h1 id="Performance-Enhancements">Performance Enhancements</h1>
<ul>
<li><p>New Faster Hash Function on 64 bit builds</p>
<p>We use a different hash function for short and long keys. This should improve performance and security, especially for long keys.</p>
</li>
<li><p>readline is faster</p>
<p>Reading from a file line-by-line with <code>readline()</code> or <code><></code> should now typically be faster due to a better implementation of the code that searches for the next newline character.</p>
</li>
</ul>
<h1 id="Modules-and-Pragmata">Modules and Pragmata</h1>
<h2 id="Updated-Modules-and-Pragmata">Updated Modules and Pragmata</h2>
<ul>
<li><p><a href="/cperl/lib/Archive/Tar.html">Archive::Tar</a> has been upgraded from version 2.18 to 2.24.</p>
</li>
<li><p><a href="/cperl/lib/B/Debug.html">B::Debug</a> has been upgraded from version 1.23 to 1.24.</p>
</li>
<li><p><a href="/cperl/lib/bignum.html">bignum</a> has been upgraded from version 0.43_01 to 0.47.</p>
</li>
<li><p><a href="/cperl/lib/Data/Dumper.html">Data::Dumper</a> has been upgraded from version 2.165 to 2.166.</p>
</li>
<li><p><a href="/cperl/lib/Encode.html">Encode</a> has been upgraded from version 2.86 to 2.88.</p>
</li>
<li><p><a href="/cperl/lib/encoding.html">encoding</a> has been upgraded from version 2.18 to 2.19.</p>
</li>
<li><p><a href="/cperl/lib/IO.html">IO</a> has been upgraded from version 1.37 to 1.38.</p>
</li>
<li><p><a href="/cperl/lib/Locale/Codes.html">Locale::Codes</a> has been upgraded from version 3.40 to 3.42.</p>
</li>
<li><p><a href="/cperl/lib/Math/BigInt.html">Math::BigInt</a> has been upgraded from version 1.999727 to 1.999806.</p>
</li>
<li><p><a href="/cperl/lib/Math/BigInt/FastCalc.html">Math::BigInt::FastCalc</a> has been upgraded from version 0.42 to 0.5005.</p>
</li>
<li><p><a href="/cperl/lib/Math/BigRat.html">Math::BigRat</a> has been upgraded from version 0.260804 to 0.2611.</p>
</li>
<li><p><a href="/cperl/lib/Module/CoreList.html">Module::CoreList</a> has been upgraded from version 5.20161120 to 5.20161220.</p>
</li>
<li><p><a href="/cperl/lib/PerlIO/scalar.html">PerlIO::scalar</a> has been upgraded from version 0.24 to 0.25.</p>
</li>
<li><p><a href="/cperl/lib/Pod/Simple.html">Pod::Simple</a> has been upgraded from version 3.32 to 3.35.</p>
</li>
<li><p><a href="/cperl/lib/POSIX.html">POSIX</a> has been upgraded from version 1.75 to 1.76.</p>
</li>
<li><p><a href="/cperl/lib/Test/Simple.html">Test::Simple</a> has been upgraded from version 1.302062 to 1.302073.</p>
</li>
<li><p><a href="/cperl/lib/Time/HiRes.html">Time::HiRes</a> has been upgraded from version 1.9740_03 to 1.9741.</p>
</li>
<li><p><a href="/cperl/lib/Time/Local.html">Time::Local</a> has been upgraded from version 1.24 to 1.25.</p>
</li>
<li><p><a href="/cperl/lib/Unicode/Collate.html">Unicode::Collate</a> has been upgraded from version 1.18 to 1.19.</p>
</li>
</ul>
<h1 id="Configuration-and-Compilation">Configuration and Compilation</h1>
<ul>
<li><p>Zero out the alignment bytes when calculating the bytes for 80-bit <code>NaN</code> and <code>Inf</code> to make builds more reproducible. [perl #130133]</p>
</li>
<li><p>Since 5.18 for testing purposes we have included support for building perl with a variety of non-standard, and non-recommended hash functions. Since we do not recommend the use of these functions we have removed them and their corresponding build options. Specifically this includes the following build options:</p>
<pre><code> PERL_HASH_FUNC_SDBM
PERL_HASH_FUNC_DJB2
PERL_HASH_FUNC_SUPERFAST
PERL_HASH_FUNC_MURMUR3
PERL_HASH_FUNC_ONE_AT_A_TIME
PERL_HASH_FUNC_ONE_AT_A_TIME_OLD
PERL_HASH_FUNC_MURMUR_HASH_64A
PERL_HASH_FUNC_MURMUR_HASH_64B</code></pre>
</li>
</ul>
<h1 id="Acknowledgements">Acknowledgements</h1>
<p>Perl 5.25.8 represents approximately 4 weeks of development since Perl 5.25.7 and contains approximately 21,000 lines of changes across 500 files from 19 authors.</p>
<p>Excluding auto-generated files, documentation and release tools, there were approximately 18,000 lines of changes to 340 .pm, .t, .c and .h files.</p>
<p>Perl continues to flourish into its third decade thanks to a vibrant community of users and developers. The following people are known to have contributed the improvements that became Perl 5.25.8:</p>
<p>Andy Lester, Aristotle Pagaltzis, Chad Granum, Chris 'BinGOs' Williams, Christian Hansen, Craig A. Berry, David Mitchell, Hugo van der Sanden, James E Keenan, J. Nick Koston, Karl Williamson, Matthew Horsfall, Niko Tyni, Petr Písař, Sawyer X, Steve Hay, Sullivan Beck, Tony Cook, Yves Orton.</p>
<p>The list above is almost certainly incomplete as it is automatically generated from version control history. In particular, it does not include the names of the (very much appreciated) contributors who reported issues to the Perl bug tracker.</p>
<p>Many of the changes included in this version originated in the CPAN modules included in Perl's core. We're grateful to the entire CPAN community for helping Perl to flourish.</p>
<p>For a more complete list of all of Perl's historical contributors, please see the <i>AUTHORS</i> file in the Perl source distribution.</p>
<h1 id="Reporting-Bugs">Reporting Bugs</h1>
<p>If you find what you think is a bug, you might check the perl bug database at <a href="https://rt.perl.org/">https://rt.perl.org/</a> . There may also be information at <a href="http://www.perl.org/">http://www.perl.org/</a> , the Perl Home Page.</p>
<p>If you believe you have an unreported bug, please run the <a>perlbug</a> program included with your release. Be sure to trim your bug down to a tiny but sufficient test case. Your bug report, along with the output of <code>perl -V</code>, will be sent off to [email protected] to be analysed by the Perl porting team.</p>
<p>If the bug you are reporting has security implications which make it inappropriate to send to a publicly archived mailing list, then see <a href="/cperl/perlsec.html#SECURITY-VULNERABILITY-CONTACT-INFORMATION">"SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec</a> for details of how to report the issue.</p>
<h1 id="SEE-ALSO">SEE ALSO</h1>
<p>The <i>Changes</i> file for an explanation of how to view exhaustive details on what changed.</p>
<p>The <i>INSTALL</i> file for how to build Perl.</p>
<p>The <i>README</i> file for general stuff.</p>
<p>The <i>Artistic</i> and <i>Copying</i> files for copyright information.</p>
</body>
</html>