S390: Optimize strrchr and wcsrchr.

This patch provides optimized versions of strrchr and wcsrchr with the z13
vector instructions.

ChangeLog:

	* sysdeps/s390/multiarch/strrchr-c.c: New File.
	* sysdeps/s390/multiarch/strrchr-vx.S: Likewise.
	* sysdeps/s390/multiarch/strrchr.c: Likewise.
	* sysdeps/s390/multiarch/wcsrchr-c.c: Likewise.
	* sysdeps/s390/multiarch/wcsrchr-vx.S: Likewise.
	* sysdeps/s390/multiarch/wcsrchr.c: Likewise.
	* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add strrchr and
	wcsrchr functions.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc test for strrchr, wcsrchr.
	* benchtests/bench-wcsrchr.c: New File.
	* benchtests/Makefile (wcsmbs-bench): Add wcsrchr.

1 files changed, 25 insertions, 0 deletions

diff --git a/sysdeps/s390/multiarch/wcsrchr-c.c b/sysdeps/s390/multiarch/wcsrchr-c.c
new file mode 100644
index 0000000000..b2a990003e
--- /dev/null
+++ b/sysdeps/s390/multiarch/wcsrchr-c.c
@@ -0,0 +1,25 @@
+/* Default wcsrchr implementation for S/390.
+   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/>.  */
+
+#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
+# define WCSRCHR  __wcsrchr_c
+
+# include <wchar.h>
+extern __typeof (wcsrchr) __wcsrchr_c;
+# include <wcsmbs/wcsrchr.c>
+#endif