svn commit: r45753 - head/en_US.ISO8859-1/htdocs/news/status
Warren Block <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.cvs.doc |
|---|---|
| Message-ID | <[email protected]> |
Author: wblock
Date: Thu Oct 9 01:44:20 2014
New Revision: 45753
URL: https://svnweb.freebsd.org/changeset/doc/45753
Log:
Add libcsse report.
Modified:
head/en_US.ISO8859-1/htdocs/news/status/report-2014-07-2014-09.xml
Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2014-07-2014-09.xml
==============================================================================
--- head/en_US.ISO8859-1/htdocs/news/status/report-2014-07-2014-09.xml Wed Oct 8 22:37:42 2014 (r45752)
+++ head/en_US.ISO8859-1/htdocs/news/status/report-2014-07-2014-09.xml Thu Oct 9 01:44:20 2014 (r45753)
@@ -1019,4 +1019,47 @@
commit bits were taken in for safe keeping.</p>
</body>
</project>
+
+ <project cat='bin'>
+ <title>SSE variants of libc routines for amd64</title>
+
+ <contact>
+ <person>
+ <name>
+ <given>John</given>
+ <common>Baldwin</common>
+ </name>
+ <email>[email protected]</email>
+ </person>
+ </contact>
+
+ <links>
+ <url href="http://trac.baldwin.cx:8080/freebsd/wiki/LibCSSE" />
+ </links>
+
+ <body>
+ <p>I have written SSE/AVX-optimized versions of a few libc
+ routines for amd64. So far the list includes <tt>memcpy</tt>,
+ <tt>memset</tt>, and <tt>strlen</tt>. For each routine I have
+ written a simple regression test as well as performed some
+ simple microbenchmarks on various AMD and Intel CPUs.</p>
+
+ <p>The simplest routine is <tt>strlen</tt> which appears to be a
+ general win in microbenchmarks. <tt>memcpy</tt> and
+ <tt>memset</tt> have proven trickier as different variants can
+ behave quite differently on different CPUs.</p>
+
+ <p>At present, I do not yet have a patch relative to libc. Once
+ I do, this will be suitable for more testing. I'd like to see
+ some real-world benchmarks that show measurable improvement
+ before pushing any of this up into the tree.</p>
+ </body>
+
+ <help>
+ <task>
+ <p>Create a branch that holds a modified libc and is suitable
+ for testing</p>
+ </task>
+ </help>
+ </project>
</report>
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