This is the mail archive of the libc-alpha@sourceware.org mailing list for the glibc project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [PATCH] Add versions of wcscpy, wcschr, wcsrchr forpower6/power7.


On Fri, 2012-06-15 at 12:59 -0500, Ryan S. Arnold wrote:
> On Wed, Jun 13, 2012 at 10:35 AM, Will Schmidt
> <will_schmidt@vnet.ibm.com> wrote:
> > Add versions of wcscpy, wcschr, wcsrchr for power6/power7.
> >
> > Initially based on the versions found in wcsmbs/* ; these files
> > have been changed by hand unrolling, and adding some additional
> > variables to allow some read-ahead to occur, which then relieves
> > some of the wait-for-increment/wait-for-load/wait-for-compare-results
> > pressure that was slowing down every iteration through the while-loop.
> >
> > For 64-bit Power7, These changes give an approx 20% throughput boost for
> > the wcschr and wcsrchr functions; and approx 40% boost for the
> > wcscpy function.  32-bit improvements appear to be slightly better
> > with ~ %30 and ~ %45 respectively.  Results for Power6 closely match
> > those for power7.
> >
> > Passed make check with no regressions.
> >
> > ---
> >
> > 2012-06-12  Will Schmidt  <will_schmidt@vnet.ibm.com>
> >
> >        * powerpc32/power6/wcschr.c: New file.
> >        * powerpc32/power6/wcscpy.c: New file.
> >        * powerpc32/power6/wcsrchr.c: New file.
> >        * powerpc64/power6/wcschr.c: New file.
> >        * powerpc64/power6/wcscpy.c: New file.
> >        * powerpc64/power6/wcsrchr.c: New file.
> 
> Hey Will, thanks for the patch.  Can you file a bugzilla under
> enhancement and target it for 2.17 so that we don't forget it?  We'll
> address this once the 2.16 branch is baked.

Done.  
http://sourceware.org/bugzilla/show_bug.cgi?id=14252



> Ryan
> 



Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]