7 files changed, 102 insertions, 21 deletions
diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
index 649f29adc2..0e86242c5d 100644
--- a/sysdeps/s390/Makefile
+++ b/sysdeps/s390/Makefile
@@ -78,5 +78,6 @@ sysdep_routines += bzero memset memset-z900 \
 		   strcspn strcspn-vx strcspn-c \
 		   memchr memchr-vx memchr-z900 \
 		   rawmemchr rawmemchr-vx rawmemchr-c \
-		   memccpy memccpy-vx memccpy-c
+		   memccpy memccpy-vx memccpy-c \
+		   memrchr memrchr-vx memrchr-c
 endif
diff --git a/sysdeps/s390/ifunc-memrchr.h b/sysdeps/s390/ifunc-memrchr.h
new file mode 100644
index 0000000000..9d80d5528d
--- /dev/null
+++ b/sysdeps/s390/ifunc-memrchr.h
@@ -0,0 +1,52 @@
+/* memrchr variant information on S/390 version.
+   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/>.  */
+
+#if defined USE_MULTIARCH && IS_IN (libc)		\
+  && ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define HAVE_MEMRCHR_IFUNC	1
+#else
+# define HAVE_MEMRCHR_IFUNC	0
+#endif
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+# define HAVE_MEMRCHR_IFUNC_AND_VX_SUPPORT HAVE_MEMRCHR_IFUNC
+#else
+# define HAVE_MEMRCHR_IFUNC_AND_VX_SUPPORT 0
+#endif
+
+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define MEMRCHR_DEFAULT	MEMRCHR_Z13
+# define HAVE_MEMRCHR_C		0
+# define HAVE_MEMRCHR_Z13	1
+#else
+# define MEMRCHR_DEFAULT	MEMRCHR_C
+# define HAVE_MEMRCHR_C		1
+# define HAVE_MEMRCHR_Z13	HAVE_MEMRCHR_IFUNC_AND_VX_SUPPORT
+#endif
+
+#if HAVE_MEMRCHR_C
+# define MEMRCHR_C		__memrchr_c
+#else
+# define MEMRCHR_C		NULL
+#endif
+
+#if HAVE_MEMRCHR_Z13
+# define MEMRCHR_Z13		__memrchr_vx
+#else
+# define MEMRCHR_Z13		NULL
+#endif
diff --git a/sysdeps/s390/multiarch/memrchr-c.c b/sysdeps/s390/memrchr-c.c
index 1e3c914a5d..333c0fc8d1 100644
--- a/sysdeps/s390/multiarch/memrchr-c.c
+++ b/sysdeps/s390/memrchr-c.c
@@ -16,10 +16,12 @@
    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 MEMRCHR  __memrchr_c
+#include <ifunc-memrchr.h>
+
+#if HAVE_MEMRCHR_C
+# if HAVE_MEMRCHR_IFUNC
+#  define MEMRCHR MEMRCHR_C
+# endif
 
-# include <string.h>
-extern __typeof (__memrchr) __memrchr_c;
 # include <string/memrchr.c>
 #endif
diff --git a/sysdeps/s390/multiarch/memrchr-vx.S b/sysdeps/s390/memrchr-vx.S
index 8e81f5ed75..ba832f1b21 100644
--- a/sysdeps/s390/multiarch/memrchr-vx.S
+++ b/sysdeps/s390/memrchr-vx.S
@@ -16,7 +16,9 @@
    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)
+#include <ifunc-memrchr.h>
+
+#if HAVE_MEMRCHR_Z13
 
 # include "sysdep.h"
 # include "asm-syntax.h"
@@ -40,7 +42,7 @@
    -v18=c replicated
    -v20=permute pattern
 */
-ENTRY(__memrchr_vx)
+ENTRY(MEMRCHR_Z13)
 	.machine "z13"
 	.machinemode "zarch_nohighgprs"
 
@@ -156,5 +158,11 @@ ENTRY(__memrchr_vx)
 
 	clgijhe	%r4,64,.Lloop64	/* If n >= 64 -> loop64.  */
 	j	.Llt64
-END(__memrchr_vx)
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+END(MEMRCHR_Z13)
+
+# if ! HAVE_MEMRCHR_IFUNC
+strong_alias (MEMRCHR_Z13, __memrchr)
+weak_alias (__memrchr, memrchr)
+# endif
+
+#endif /* HAVE_MEMRCHR_Z13  */
diff --git a/sysdeps/s390/multiarch/memrchr.c b/sysdeps/s390/memrchr.c
index 43a44abcf6..d995e9961c 100644
--- a/sysdeps/s390/multiarch/memrchr.c
+++ b/sysdeps/s390/memrchr.c
@@ -16,13 +16,24 @@
    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)
+#include <ifunc-memrchr.h>
+
+#if HAVE_MEMRCHR_IFUNC
 # include <string.h>
 # include <ifunc-resolve.h>
 
-s390_vx_libc_ifunc (__memrchr)
-weak_alias (__memrchr, memrchr)
+# if HAVE_MEMRCHR_C
+extern __typeof (__memrchr) MEMRCHR_C attribute_hidden;
+# endif
 
-#else
-# include <string/memrchr.c>
-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
+# if HAVE_MEMRCHR_Z13
+extern __typeof (__memrchr) MEMRCHR_Z13 attribute_hidden;
+# endif
+
+s390_libc_ifunc_expr (__memrchr, __memrchr,
+		      (HAVE_MEMRCHR_Z13 && (hwcap & HWCAP_S390_VX))
+		      ? MEMRCHR_Z13
+		      : MEMRCHR_DEFAULT
+		      )
+weak_alias (__memrchr, memrchr)
+#endif /* HAVE_MEMRCHR_IFUNC  */
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index d5a32fc309..260b514936 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,7 +1,3 @@
-ifeq ($(subdir),string)
-sysdep_routines += memrchr memrchr-vx memrchr-c
-endif
-
 ifeq ($(subdir),wcsmbs)
 sysdep_routines += wcslen wcslen-vx wcslen-c \
 		   wcsnlen wcsnlen-vx wcsnlen-c \
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index b8917747f0..0f01b99691 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -45,6 +45,7 @@
 #include <ifunc-memchr.h>
 #include <ifunc-rawmemchr.h>
 #include <ifunc-memccpy.h>
+#include <ifunc-memrchr.h>
 
 /* Maximum number of IFUNC implementations.  */
 #define MAX_IFUNC	3
@@ -411,6 +412,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 		)
 #endif /* HAVE_MEMCCPY_IFUNC  */
 
+#if HAVE_MEMRCHR_IFUNC
+    IFUNC_IMPL (i, name, memrchr,
+# if HAVE_MEMRCHR_Z13
+		IFUNC_IMPL_ADD (array, i, memrchr,
+				dl_hwcap & HWCAP_S390_VX, MEMRCHR_Z13)
+# endif
+# if HAVE_MEMRCHR_C
+		IFUNC_IMPL_ADD (array, i, memrchr, 1, MEMRCHR_C)
+# endif
+		)
+#endif /* HAVE_MEMRCHR_IFUNC  */
+
 #ifdef HAVE_S390_VX_ASM_SUPPORT
 
 # define IFUNC_VX_IMPL(FUNC)						\
@@ -457,8 +470,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
   IFUNC_VX_IMPL (wmemcmp);
 
-  IFUNC_VX_IMPL (memrchr);
-
 #endif /* HAVE_S390_VX_ASM_SUPPORT */
 
   return i;