[PATCH] Add versions of wcscpy, wcschr, wcsrchr for power6/power7.

[Ryan S. Arnold]

On Fri, Jun 15, 2012 at 3:48 PM, Will Schmidt <will_schmidt@vnet.ibm.com> wrote:
> 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

I retested the patch against HEAD and it builds and passes make check
for powerpc32 and powerpc64.
I pushed the fix upstream with git commit
15d0da8cb36f5c96a3c649d29a2e2623e995cd49

I'll close out the bugzilla.

Ryan