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.

1 files changed, 10 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 104147f88b..c930ae8fa2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2012-08-22  Will Schmidt  <will_schmidt@vnet.ibm.com>
+
+	[BZ #14252]
+	* 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.
+
 2012-08-21  Maxim Kuvyrkov  <maxim@codesourcery.com>
 
 	* string/str-two-way.h (AVAILABLE1_USES_J): New macro, define default.