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