S390: Optimize strncpy and wcsncpy.

This patch provides optimized versions of strncpy and wcsncpy with the z13
vector instructions.

ChangeLog:

	* sysdeps/s390/multiarch/strncpy-vx.S: New File.
	* sysdeps/s390/multiarch/strncpy.c: Likewise.
	* sysdeps/s390/multiarch/wcsncpy-c.c: Likewise.
	* sysdeps/s390/multiarch/wcsncpy-vx.S: Likewise.
	* sysdeps/s390/multiarch/wcsncpy.c: Likewise.
	* sysdeps/s390/s390-32/multiarch/strncpy.c: Likewise.
	* sysdeps/s390/s390-64/multiarch/strncpy.c: Likewise.
	* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add strncpy and
	wcsncpy functions.
	* wcsmbs/wcsncpy.c: Use WCSNCPY if defined.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc test for strncpy, wcsncpy.
	* string/test-strncpy.c: Add wcsncpy support.
	* wcsmbs/test-wcsncpy.c: New File.
	* wcsmbs/Makefile (strop-tests): Add wcsncpy.
	* benchtests/bench-strncpy.c: Add wcsncpy support.
	* benchtests/bench-wcsncpy.c: New File.
	* benchtests/Makefile (wcsmbs-bench): Add wcsncpy

3 files changed, 94 insertions, 38 deletions

diff --git a/benchtests/Makefile b/benchtests/Makefile
index bf1f6dc..3785328 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
+wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy wcsncpy
 string-bench-all := $(string-bench) ${wcsmbs-bench}
 
 # We have to generate locales
diff --git a/benchtests/bench-strncpy.c b/benchtests/bench-strncpy.c
index 517daa0..de1e2af 100644
--- a/benchtests/bench-strncpy.c
+++ b/benchtests/bench-strncpy.c
@@ -16,23 +16,56 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifdef WIDE
+# include <wchar.h>
+# define CHAR wchar_t
+# define UCHAR wchar_t
+# define BIG_CHAR WCHAR_MAX
+# define SMALL_CHAR 1273
+# define MEMCMP wmemcmp
+# define MEMSET wmemset
+# define STRNLEN wcsnlen
+#else
+# define CHAR char
+# define UCHAR unsigned char
+# define BIG_CHAR CHAR_MAX
+# define SMALL_CHAR 127
+# define MEMCMP memcmp
+# define MEMSET memset
+# define STRNLEN strnlen
+#endif /* !WIDE */
+
+
 #ifndef STRNCPY_RESULT
 # define STRNCPY_RESULT(dst, len, n) dst
 # define TEST_MAIN
-# define TEST_NAME "strncpy"
+# ifndef WIDE
+#  define TEST_NAME "strncpy"
+# else
+#  define TEST_NAME "wcsncpy"
+# endif /* WIDE */
 # include "bench-string.h"
-
-char *simple_strncpy (char *, const char *, size_t);
-char *stupid_strncpy (char *, const char *, size_t);
-
-IMPL (stupid_strncpy, 0)
-IMPL (simple_strncpy, 0)
-IMPL (strncpy, 1)
-
-char *
-simple_strncpy (char *dst, const char *src, size_t n)
+# ifndef WIDE
+#  define SIMPLE_STRNCPY simple_strncpy
+#  define STUPID_STRNCPY stupid_strncpy
+#  define STRNCPY strncpy
+# else
+#  define SIMPLE_STRNCPY simple_wcsncpy
+#  define STUPID_STRNCPY stupid_wcsncpy
+#  define STRNCPY wcsncpy
+# endif /* WIDE */
+
+CHAR *SIMPLE_STRNCPY (CHAR *, const CHAR *, size_t);
+CHAR *STUPID_STRNCPY (CHAR *, const CHAR *, size_t);
+
+IMPL (STUPID_STRNCPY, 0)
+IMPL (SIMPLE_STRNCPY, 0)
+IMPL (STRNCPY, 1)
+
+CHAR *
+SIMPLE_STRNCPY (CHAR *dst, const CHAR *src, size_t n)
 {
-  char *ret = dst;
+  CHAR *ret = dst;
   while (n--)
     if ((*dst++ = *src++) == '\0')
       {
@@ -43,10 +76,10 @@ simple_strncpy (char *dst, const char *src, size_t n)
   return ret;
 }
 
-char *
-stupid_strncpy (char *dst, const char *src, size_t n)
+CHAR *
+STUPID_STRNCPY (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)
@@ -55,12 +88,12 @@ stupid_strncpy (char *dst, const char *src, size_t n)
     dst[i] = '\0';
   return dst;
 }
-#endif
+#endif /* !STRNCPY_RESULT */
 
-typedef char *(*proto_t) (char *, const char *, size_t);
+typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);
 
 static void
-do_one_test (impl_t *impl, char *dst, const char *src, size_t len, size_t n)
+do_one_test (impl_t *impl, CHAR *dst, const CHAR *src, size_t len, size_t n)
 {
   size_t i, iters = INNER_LOOP_ITERS;
   timing_t start, stop, cur;
@@ -73,7 +106,7 @@ do_one_test (impl_t *impl, char *dst, const char *src, size_t len, size_t n)
       return;
     }
 
-  if (memcmp (dst, src, len > n ? n : len) != 0)
+  if (memcmp (dst, src, (len > n ? n : len) * sizeof (CHAR)) != 0)
     {
       error (0, 0, "Wrong result in function %s", impl->name);
       ret = 1;
@@ -109,23 +142,26 @@ static void
 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)
 {
   size_t i;
-  char *s1, *s2;
+  CHAR *s1, *s2;
 
+/* For wcsncpy: align1 and align2 here mean alignment not in bytes,
+   but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t)).  */
   align1 &= 7;
-  if (align1 + len >= page_size)
+  if ((align1 + len) * sizeof (CHAR) >= page_size)
     return;
 
   align2 &= 7;
-  if (align2 + len >= page_size)
+  if ((align2 + len) * sizeof (CHAR) >= page_size)
     return;
 
-  s1 = (char *) (buf1 + align1);
-  s2 = (char *) (buf2 + align2);
+  s1 = (CHAR *) (buf1) + align1;
+  s2 = (CHAR *) (buf2) + align2;
 
   for (i = 0; i < len; ++i)
     s1[i] = 32 + 23 * i % (max_char - 32);
   s1[len] = 0;
-  for (i = len + 1; i + align1 < page_size && i < len + 64; ++i)
+  for (i = len + 1; (i + align1) * sizeof (CHAR) < page_size && i < len + 64;
+       ++i)
     s1[i] = 32 + 32 * i % (max_char - 32);
 
   printf ("Length %4zd, n %4zd, alignment %2zd/%2zd:", len, n, align1, align2);
@@ -150,22 +186,22 @@ test_main (void)
 
   for (i = 1; i < 8; ++i)
     {
-      do_test (i, i, 16, 16, 127);
-      do_test (i, i, 16, 16, 255);
-      do_test (i, 2 * i, 16, 16, 127);
-      do_test (2 * i, i, 16, 16, 255);
-      do_test (8 - i, 2 * i, 1 << i, 2 << i, 127);
-      do_test (2 * i, 8 - i, 2 << i, 1 << i, 127);
-      do_test (8 - i, 2 * i, 1 << i, 2 << i, 255);
-      do_test (2 * i, 8 - i, 2 << i, 1 << i, 255);
+      do_test (i, i, 16, 16, SMALL_CHAR);
+      do_test (i, i, 16, 16, BIG_CHAR);
+      do_test (i, 2 * i, 16, 16, SMALL_CHAR);
+      do_test (2 * i, i, 16, 16, BIG_CHAR);
+      do_test (8 - i, 2 * i, 1 << i, 2 << i, SMALL_CHAR);
+      do_test (2 * i, 8 - i, 2 << i, 1 << i, SMALL_CHAR);
+      do_test (8 - i, 2 * i, 1 << i, 2 << i, BIG_CHAR);
+      do_test (2 * i, 8 - i, 2 << i, 1 << i, BIG_CHAR);
     }
 
   for (i = 1; i < 8; ++i)
     {
-      do_test (0, 0, 4 << i, 8 << i, 127);
-      do_test (0, 0, 16 << i, 8 << i, 127);
-      do_test (8 - i, 2 * i, 4 << i, 8 << i, 127);
-      do_test (8 - i, 2 * i, 16 << i, 8 << i, 127);
+      do_test (0, 0, 4 << i, 8 << i, SMALL_CHAR);
+      do_test (0, 0, 16 << i, 8 << i, SMALL_CHAR);
+      do_test (8 - i, 2 * i, 4 << i, 8 << i, SMALL_CHAR);
+      do_test (8 - i, 2 * i, 16 << i, 8 << i, SMALL_CHAR);
     }
 
   return ret;
diff --git a/benchtests/bench-wcsncpy.c b/benchtests/bench-wcsncpy.c
new file mode 100644
index 0000000..d6f63c9
--- /dev/null
+++ b/benchtests/bench-wcsncpy.c
@@ -0,0 +1,20 @@
+/* Measure wcsncpy 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-strncpy.c"