powerpc: Zero pad using memset in strncpy/stpncpy

Call __memset_power8 to pad, with zeros, the remaining bytes in the
dest string on __strncpy_power8 and __stpncpy_power8.  This improves
performance when n is larger than the input string, giving ~30% gain for
larger strings without impacting much shorter strings.

1 files changed, 5 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 768c0a0d02..5f8424a088 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2016-04-29  Gabriel F. T. Gomes  <gftg@linux.vnet.ibm.com>
+
+	* sysdeps/powerpc/powerpc64/power8/strncpy.S: Call memset to pad the
+	remaining bytes in the dest string, with zeros.
+
 2016-04-29  Florian Weimer  <fweimer@redhat.com>
 
 	[BZ #20010]