Date: Thu, 9 Oct 2014 01:44:21 +0000 (UTC) From: Warren Block <wblock@FreeBSD.org> To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r45753 - head/en_US.ISO8859-1/htdocs/news/status Message-ID: <201410090144.s991iL5a046507@svn.freebsd.org>
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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>jhb@FreeBSD.org</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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