S390: Add z13 strstr ifunc variant.

The new vector variant of strstr is using the common code
implementation, but instead of calling the default
str* / mem* functions, the vector variants are called.

ChangeLog:

	* sysdeps/s390/Makefile (sysdep_routines): Add strstr variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc variants for strstr.
	* sysdeps/s390/ifunc-strstr.h: New file.
	* sysdeps/s390/strstr.c: Likewise.
	* sysdeps/s390/strstr-c.c: Likewise.
	* sysdeps/s390/strstr-vx.c: Likewise.

1 files changed, 52 insertions, 0 deletions

diff --git a/sysdeps/s390/strstr-vx.c b/sysdeps/s390/strstr-vx.c
new file mode 100644
index 0000000..effae9d
--- /dev/null
+++ b/sysdeps/s390/strstr-vx.c
@@ -0,0 +1,52 @@
+/* Default strstr implementation with vector string functions for S/390.
+   Copyright (C) 2018 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/>.  */
+
+#include <ifunc-strstr.h>
+
+#if HAVE_STRSTR_Z13
+# if HAVE_STRSTR_IFUNC
+#  define STRSTR STRSTR_Z13
+#  if defined SHARED && IS_IN (libc)
+#   undef libc_hidden_builtin_def
+#   if HAVE_STRSTR_C
+#    define libc_hidden_builtin_def(name)
+#   else
+#    define libc_hidden_builtin_def(name)		\
+  __hidden_ver1 (__strstr_vx, __GI_strstr, __strstr_vx);
+#   endif
+#  endif
+# endif
+
+# include <string.h>
+
+# ifdef USE_MULTIARCH
+extern __typeof (strchr) __strchr_vx attribute_hidden;
+#  define strchr __strchr_vx
+
+extern __typeof (strlen) __strlen_vx attribute_hidden;
+#  define strlen __strlen_vx
+
+extern __typeof (__strnlen) __strnlen_vx attribute_hidden;
+#  define __strnlen __strnlen_vx
+
+extern __typeof (memcmp) __memcmp_z196 attribute_hidden;
+#  define memcmp __memcmp_z196
+# endif
+
+# include <string/strstr.c>
+#endif