S390: Implement bzero with memset.

This patch removes the bzero s390 implementation with mvcle and
adds entry points for bzero in memset ifunc variants.
Therefore an ifunc resolver is implemented for bzero, too.

ChangeLog:

	* sysdeps/s390/s390-32/bzero.S: Delete file.
	* sysdeps/s390/s390-64/bzero.S: Likewise.
	* sysdeps/s390/Makefile (sysdep_routines): Add bzero.
	* sysdeps/s390/bzero.c: New file.
	* sysdeps/s390/memset-z900.S: Add bzero entry points.
	* sysdeps/s390/ifunc-memset.h: Add bzero function macros.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add bzero ifunc variants.

1 files changed, 47 insertions, 0 deletions

diff --git a/sysdeps/s390/bzero.c b/sysdeps/s390/bzero.c
new file mode 100644
index 0000000000..9f8d95781b
--- /dev/null
+++ b/sysdeps/s390/bzero.c
@@ -0,0 +1,47 @@
+/* Multiple versions of bzero.
+   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-memset.h>
+#if HAVE_MEMSET_IFUNC
+# include <string.h>
+# include <ifunc-resolve.h>
+
+# if HAVE_MEMSET_Z900_G5
+extern __typeof (__bzero) BZERO_Z900_G5 attribute_hidden;
+# endif
+
+# if HAVE_MEMSET_Z10
+extern __typeof (__bzero) BZERO_Z10 attribute_hidden;
+# endif
+
+# if HAVE_MEMSET_Z196
+extern __typeof (__bzero) BZERO_Z196 attribute_hidden;
+# endif
+
+s390_libc_ifunc_expr (__bzero, __bzero,
+		      ({
+			s390_libc_ifunc_init ();
+			(HAVE_MEMSET_Z196 && S390_IS_Z196 (stfle_bits))
+			  ? BZERO_Z196
+			  : (HAVE_MEMSET_Z10 && S390_IS_Z10 (stfle_bits))
+			  ? BZERO_Z10
+			  : BZERO_DEFAULT;
+		      })
+		      )
+weak_alias (__bzero, bzero)
+#endif