S390: Optimize stpncpy and wcpncpy.

This patch provides optimized versions of stpncpy and wcpncpy with the z13
vector instructions.

ChangeLog:

	* sysdeps/s390/multiarch/stpncpy-c.c: New File.
	* sysdeps/s390/multiarch/stpncpy-vx.S: Likewise.
	* sysdeps/s390/multiarch/stpncpy.c: Likewise.
	* sysdeps/s390/multiarch/wcpncpy-c.c: Likewise.
	* sysdeps/s390/multiarch/wcpncpy-vx.S: Likewise.
	* sysdeps/s390/multiarch/wcpncpy.c: Likewise.
	* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add stpncpy and
	wcpncpy functions.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc test for stpncpy, wcpncpy.
	* wcsmbs/wcpncpy.c: Use WCPNCPY if defined.
	* string/test-stpncpy.c: Add wcpncpy support.
	* wcsmbs/test-wcpncpy.c: New File.
	* wcsmbs/Makefile (strop-tests): Add wcpncpy.
	* benchtests/bench-stpncpy.c: Add wcpncpy support.
	* benchtests/bench-wcpncpy.c: New File.
	* benchtests/Makefile (wcsmbs-bench): Add wcpncpy.

3 files changed, 51 insertions, 12 deletions

diff --git a/benchtests/Makefile b/benchtests/Makefile
index 37853287b8..c3531a9954 100644
--- a/benchtests/Makefile
+++ b/benchtests/Makefile
@@ -36,7 +36,7 @@ string-bench := bcopy bzero memccpy memchr memcmp memcpy memmem memmove \
 		strncasecmp strncat strncmp strncpy strnlen strpbrk strrchr \
 		strspn strstr strcpy_chk stpcpy_chk memrchr strsep strtok \
 		strcoll
-wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy wcsncpy
+wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy
 string-bench-all := $(string-bench) ${wcsmbs-bench}
 
 # We have to generate locales
diff --git a/benchtests/bench-stpncpy.c b/benchtests/bench-stpncpy.c
index 53539c7e59..822db1f927 100644
--- a/benchtests/bench-stpncpy.c
+++ b/benchtests/bench-stpncpy.c
@@ -18,18 +18,36 @@
 
 #define STRNCPY_RESULT(dst, len, n) ((dst) + ((len) > (n) ? (n) : (len)))
 #define TEST_MAIN
-#define TEST_NAME "stpncpy"
+#ifndef WIDE
+# define TEST_NAME "stpncpy"
+#else
+# define TEST_NAME "wcpncpy"
+#endif /* WIDE */
 #include "bench-string.h"
+#ifndef WIDE
+# define CHAR char
+# define SIMPLE_STPNCPY simple_stpncpy
+# define STUPID_STPNCPY stupid_stpncpy
+# define STPNCPY stpncpy
+# define STRNLEN strnlen
+#else
+# include <wchar.h>
+# define CHAR wchar_t
+# define SIMPLE_STPNCPY simple_wcpncpy
+# define STUPID_STPNCPY stupid_wcpncpy
+# define STPNCPY wcpncpy
+# define STRNLEN wcsnlen
+#endif /* WIDE */
 
-char *simple_stpncpy (char *, const char *, size_t);
-char *stupid_stpncpy (char *, const char *, size_t);
+CHAR *SIMPLE_STPNCPY (CHAR *, const CHAR *, size_t);
+CHAR *STUPID_STPNCPY (CHAR *, const CHAR *, size_t);
 
-IMPL (stupid_stpncpy, 0)
-IMPL (simple_stpncpy, 0)
-IMPL (stpncpy, 1)
+IMPL (STUPID_STPNCPY, 0)
+IMPL (SIMPLE_STPNCPY, 0)
+IMPL (STPNCPY, 1)
 
-char *
-simple_stpncpy (char *dst, const char *src, size_t n)
+CHAR *
+SIMPLE_STPNCPY (CHAR *dst, const CHAR *src, size_t n)
 {
   while (n--)
     if ((*dst++ = *src++) == '\0')
@@ -43,10 +61,10 @@ simple_stpncpy (char *dst, const char *src, size_t n)
   return dst;
 }
 
-char *
-stupid_stpncpy (char *dst, const char *src, size_t n)
+CHAR *
+STUPID_STPNCPY (CHAR *dst, const CHAR *src, size_t n)
 {
-  size_t nc = strnlen (src, n);
+  size_t nc = STRNLEN (src, n);
   size_t i;
 
   for (i = 0; i < nc; ++i)
@@ -56,4 +74,5 @@ stupid_stpncpy (char *dst, const char *src, size_t n)
   return dst + nc;
 }
 
+#undef CHAR
 #include "bench-strncpy.c"
diff --git a/benchtests/bench-wcpncpy.c b/benchtests/bench-wcpncpy.c
new file mode 100644
index 0000000000..8aa529e01b
--- /dev/null
+++ b/benchtests/bench-wcpncpy.c
@@ -0,0 +1,20 @@
+/* Measure wcpncpy functions.
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define WIDE 1
+#include "bench-stpncpy.c"