S390: Optimize memchr, rawmemchr and wmemchr.

This patch provides optimized versions of memchr, rawmemchr and wmemchr with the
z13 vector instructions.

ChangeLog:

	* sysdeps/s390/multiarch/memchr-vx.S: New File.
	* sysdeps/s390/multiarch/memchr.c: Likewise.
	* sysdeps/s390/multiarch/rawmemchr-c.c: Likewise.
	* sysdeps/s390/multiarch/rawmemchr-vx.S: Likewise.
	* sysdeps/s390/multiarch/rawmemchr.c: Likewise.
	* sysdeps/s390/multiarch/wmemchr-c.c: Likewise.
	* sysdeps/s390/multiarch/wmemchr-vx.S: Likewise.
	* sysdeps/s390/multiarch/wmemchr.c: Likewise.
	* sysdeps/s390/s390-32/multiarch/memchr.c: Likewise.
	* sysdeps/s390/s390-64/multiarch/memchr.c: Likewise.
	* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add memchr, wmemchr
	and rawmemchr functions.
	* sysdeps/s390/multiarch/ifunc-impl-list-common.c
	(__libc_ifunc_impl_list_common): Add ifunc test for memchr, rawmemchr
	and wmemchr.
	* wcsmbs/wmemchr.c: Use WMEMCHR if defined.
	* string/test-memchr.c: Add wmemchr support.
	* wcsmbs/test-wmemchr.c: New File.
	* wcsmbs/Makefile (strop-tests): Add wmemchr.
	* benchtests/bench-memchr.c: Add wmemchr support.
	* benchtests/bench-wmemchr.c: New File.
	* benchtests/Makefile (wcsmbs-bench): wmemchr.

3 files changed, 68 insertions, 24 deletions

diff --git a/benchtests/Makefile b/benchtests/Makefile
index 46cb34f..95712a3 100644
--- a/benchtests/Makefile
+++ b/benchtests/Makefile
@@ -37,7 +37,8 @@ string-bench := bcopy bzero memccpy memchr memcmp memcpy memmem memmove \
 		strspn strstr strcpy_chk stpcpy_chk memrchr strsep strtok \
 		strcoll
 wcsmbs-bench := wcslen wcsnlen wcscpy wcpcpy wcsncpy wcpncpy wcscat wcsncat \
-		wcscmp wcsncmp wcschr wcschrnul wcsrchr wcsspn wcspbrk wcscspn
+		wcscmp wcsncmp wcschr wcschrnul wcsrchr wcsspn wcspbrk wcscspn \
+		wmemchr
 string-bench-all := $(string-bench) ${wcsmbs-bench}
 
 # We have to generate locales
diff --git a/benchtests/bench-memchr.c b/benchtests/bench-memchr.c
index 9879ec8..3ead3cd 100644
--- a/benchtests/bench-memchr.c
+++ b/benchtests/bench-memchr.c
@@ -16,31 +16,52 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifndef WIDE
+# define CHAR char
+# define SMALL_CHAR 127
+#else
+# include <wchar.h>
+# define CHAR wchar_t
+# define SMALL_CHAR 1273
+#endif /* WIDE */
+
 #ifndef USE_AS_MEMRCHR
 # define TEST_MAIN
-# define TEST_NAME "memchr"
+# ifndef WIDE
+#  define TEST_NAME "memchr"
+# else
+#  define TEST_NAME "wmemchr"
+# endif /* WIDE */
 # include "bench-string.h"
 
-typedef char *(*proto_t) (const char *, int, size_t);
-char *simple_memchr (const char *, int, size_t);
+# ifndef WIDE
+#  define MEMCHR memchr
+#  define SIMPLE_MEMCHR simple_memchr
+# else
+#  define MEMCHR wmemchr
+#  define SIMPLE_MEMCHR simple_wmemchr
+# endif /* WIDE */
+
+typedef CHAR *(*proto_t) (const CHAR *, int, size_t);
+CHAR *SIMPLE_MEMCHR (const CHAR *, int, size_t);
 
-IMPL (simple_memchr, 0)
-IMPL (memchr, 1)
+IMPL (SIMPLE_MEMCHR, 0)
+IMPL (MEMCHR, 1)
 
-char *
-simple_memchr (const char *s, int c, size_t n)
+CHAR *
+SIMPLE_MEMCHR (const CHAR *s, int c, size_t n)
 {
   while (n--)
-    if (*s++ == (char) c)
-      return (char *) s - 1;
+    if (*s++ == (CHAR) c)
+      return (CHAR *) s - 1;
   return NULL;
 }
-#endif
+#endif /* !USE_AS_MEMRCHR */
 
 static void
-do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
+do_one_test (impl_t *impl, const CHAR *s, int c, size_t n, CHAR *exp_res)
 {
-  char *res = CALL (impl, s, c, n);
+  CHAR *res = CALL (impl, s, c, n);
   size_t i, iters = INNER_LOOP_ITERS;
   timing_t start, stop, cur;
 
@@ -68,36 +89,38 @@ static void
 do_test (size_t align, size_t pos, size_t len, int seek_char)
 {
   size_t i;
-  char *result;
+  CHAR *result;
 
   align &= 7;
-  if (align + len >= page_size)
+  if ((align + len) * sizeof (CHAR) >= page_size)
     return;
 
+  CHAR *buf = (CHAR *) (buf1);
+
   for (i = 0; i < len; ++i)
     {
-      buf1[align + i] = 1 + 23 * i % 127;
-      if (buf1[align + i] == seek_char)
-        buf1[align + i] = seek_char + 1;
+      buf[align + i] = 1 + 23 * i % SMALL_CHAR;
+      if (buf[align + i] == seek_char)
+	buf[align + i] = seek_char + 1;
     }
-  buf1[align + len] = 0;
+  buf[align + len] = 0;
 
   if (pos < len)
     {
-      buf1[align + pos] = seek_char;
-      buf1[align + len] = -seek_char;
-      result = (char *) (buf1 + align + pos);
+      buf[align + pos] = seek_char;
+      buf[align + len] = -seek_char;
+      result = (CHAR *) (buf + align + pos);
     }
   else
     {
       result = NULL;
-      buf1[align + len] = seek_char;
+      buf[align + len] = seek_char;
     }
 
   printf ("Length %4zd, alignment %2zd:", pos, align);
 
   FOR_EACH_IMPL (impl, 0)
-    do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
+    do_one_test (impl, (CHAR *) (buf + align), seek_char, len, result);
 
   putchar ('\n');
 }
diff --git a/benchtests/bench-wmemchr.c b/benchtests/bench-wmemchr.c
new file mode 100644
index 0000000..d796a69
--- /dev/null
+++ b/benchtests/bench-wmemchr.c
@@ -0,0 +1,20 @@
+/* Measure wmemchr 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-memchr.c"