S390: Refactor rawmemchr ifunc handling.

The ifunc handling for rawmemchr is adjusted in order to omit ifunc
variants if those will never be used as the minimum architecture level
already supports newer CPUs by default.
Glibc internal calls will then also use the "newer" ifunc variant.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile
	(sysdep_routines): Remove rawmemchr variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add rawmemchr variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for rawmemchr.
	* sysdeps/s390/multiarch/rawmemchr-c.c: Move to ...
	* sysdeps/s390/rawmemchr-c.c: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/rawmemchr-vx.S: Move to ...
	* sysdeps/s390/rawmemchr-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/rawmemchr.c: Move to ...
	* sysdeps/s390/rawmemchr.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-rawmemchr.h: New file.

7 files changed, 118 insertions, 32 deletions

diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
index 8f11ed5463..a181eeac8a 100644
--- a/sysdeps/s390/Makefile
+++ b/sysdeps/s390/Makefile
@@ -76,5 +76,6 @@ sysdep_routines += bzero memset memset-z900 \
 		   strspn strspn-vx strspn-c \
 		   strpbrk strpbrk-vx strpbrk-c \
 		   strcspn strcspn-vx strcspn-c \
-		   memchr memchr-vx memchr-z900
+		   memchr memchr-vx memchr-z900 \
+		   rawmemchr rawmemchr-vx rawmemchr-c
 endif
diff --git a/sysdeps/s390/ifunc-rawmemchr.h b/sysdeps/s390/ifunc-rawmemchr.h
new file mode 100644
index 0000000000..bfcbeae802
--- /dev/null
+++ b/sysdeps/s390/ifunc-rawmemchr.h
@@ -0,0 +1,52 @@
+/* rawmemchr 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_RAWMEMCHR_IFUNC	1
+#else
+# define HAVE_RAWMEMCHR_IFUNC	0
+#endif
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+# define HAVE_RAWMEMCHR_IFUNC_AND_VX_SUPPORT HAVE_RAWMEMCHR_IFUNC
+#else
+# define HAVE_RAWMEMCHR_IFUNC_AND_VX_SUPPORT 0
+#endif
+
+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define RAWMEMCHR_DEFAULT	RAWMEMCHR_Z13
+# define HAVE_RAWMEMCHR_C	0
+# define HAVE_RAWMEMCHR_Z13	1
+#else
+# define RAWMEMCHR_DEFAULT	RAWMEMCHR_C
+# define HAVE_RAWMEMCHR_C	1
+# define HAVE_RAWMEMCHR_Z13	HAVE_RAWMEMCHR_IFUNC_AND_VX_SUPPORT
+#endif
+
+#if HAVE_RAWMEMCHR_C
+# define RAWMEMCHR_C		__rawmemchr_c
+#else
+# define RAWMEMCHR_C		NULL
+#endif
+
+#if HAVE_RAWMEMCHR_Z13
+# define RAWMEMCHR_Z13		__rawmemchr_vx
+#else
+# define RAWMEMCHR_Z13		NULL
+#endif
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index fa1f7b81db..ac6cfcf9c7 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,6 +1,5 @@
 ifeq ($(subdir),string)
-sysdep_routines += rawmemchr rawmemchr-vx rawmemchr-c \
-		   memccpy memccpy-vx memccpy-c \
+sysdep_routines += memccpy memccpy-vx memccpy-c \
 		   memrchr memrchr-vx memrchr-c
 endif
 
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index b4be014042..bf3b40e111 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -43,6 +43,7 @@
 #include <ifunc-strpbrk.h>
 #include <ifunc-strcspn.h>
 #include <ifunc-memchr.h>
+#include <ifunc-rawmemchr.h>
 
 /* Maximum number of IFUNC implementations.  */
 #define MAX_IFUNC	3
@@ -385,6 +386,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 		)
 #endif /* HAVE_MEMCHR_IFUNC  */
 
+#if HAVE_RAWMEMCHR_IFUNC
+    IFUNC_IMPL (i, name, rawmemchr,
+# if HAVE_RAWMEMCHR_Z13
+		IFUNC_IMPL_ADD (array, i, rawmemchr,
+				dl_hwcap & HWCAP_S390_VX, RAWMEMCHR_Z13)
+# endif
+# if HAVE_RAWMEMCHR_C
+		IFUNC_IMPL_ADD (array, i, rawmemchr, 1, RAWMEMCHR_C)
+# endif
+		)
+#endif /* HAVE_RAWMEMCHR_IFUNC  */
+
 #ifdef HAVE_S390_VX_ASM_SUPPORT
 
 # define IFUNC_VX_IMPL(FUNC)						\
@@ -426,7 +439,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
   IFUNC_VX_IMPL (wcscspn);
 
   IFUNC_VX_IMPL (wmemchr);
-  IFUNC_VX_IMPL (rawmemchr);
 
   IFUNC_VX_IMPL (memccpy);
 
diff --git a/sysdeps/s390/multiarch/rawmemchr.c b/sysdeps/s390/rawmemchr-c.c
index 5fdb2252df..8b8208e542 100644
--- a/sysdeps/s390/multiarch/rawmemchr.c
+++ b/sysdeps/s390/rawmemchr-c.c
@@ -1,4 +1,4 @@
-/* Multiple versions of rawmemchr.
+/* Default rawmemchr implementation for S/390.
    Copyright (C) 2015-2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -16,16 +16,19 @@
    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 __rawmemchr __redirect___rawmemchr
-# include <string.h>
-# undef __rawmemchr
-# include <ifunc-resolve.h>
+#include <ifunc-rawmemchr.h>
 
-s390_vx_libc_ifunc2_redirected (__redirect___rawmemchr, __rawmemchr
-				, __rawmemchr)
-weak_alias (__rawmemchr, rawmemchr)
+#if HAVE_RAWMEMCHR_C
+# if HAVE_RAWMEMCHR_IFUNC
+#  define RAWMEMCHR RAWMEMCHR_C
+#  undef weak_alias
+#  define weak_alias(a, b)
+#  if defined SHARED && IS_IN (libc)
+#   undef libc_hidden_def
+#   define libc_hidden_def(name)					\
+  __hidden_ver1 (__rawmemchr_c, __GI___rawmemchr, __rawmemchr_c);
+#  endif
+# endif
 
-#else
 # include <string/rawmemchr.c>
-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
+#endif
diff --git a/sysdeps/s390/multiarch/rawmemchr-vx.S b/sysdeps/s390/rawmemchr-vx.S
index d5778be068..f04c0e8b61 100644
--- a/sysdeps/s390/multiarch/rawmemchr-vx.S
+++ b/sysdeps/s390/rawmemchr-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-rawmemchr.h>
+
+#if HAVE_RAWMEMCHR_Z13
 
 # include "sysdep.h"
 # include "asm-syntax.h"
@@ -37,7 +39,7 @@
    -v17=index of unequal
    -v18=c replicated
 */
-ENTRY(__rawmemchr_vx)
+ENTRY(RAWMEMCHR_Z13)
 	.machine "z13"
 	.machinemode "zarch_nohighgprs"
 
@@ -88,5 +90,15 @@ ENTRY(__rawmemchr_vx)
 .Lend_found:
 	la	%r2,0(%r5,%r2)	/* Return pointer to character.  */
 	br	%r14
-END(__rawmemchr_vx)
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+END(RAWMEMCHR_Z13)
+
+# if ! HAVE_RAWMEMCHR_IFUNC
+strong_alias (RAWMEMCHR_Z13, __rawmemchr)
+weak_alias (__rawmemchr, rawmemchr)
+# endif
+
+# if ! HAVE_RAWMEMCHR_C && defined SHARED && IS_IN (libc)
+strong_alias (RAWMEMCHR_Z13, __GI___rawmemchr)
+# endif
+
+#endif /* HAVE_RAWMEMCHR_Z13  */
diff --git a/sysdeps/s390/multiarch/rawmemchr-c.c b/sysdeps/s390/rawmemchr.c
index f43c883a76..d9263ce208 100644
--- a/sysdeps/s390/multiarch/rawmemchr-c.c
+++ b/sysdeps/s390/rawmemchr.c
@@ -1,4 +1,4 @@
-/* Default rawmemchr implementation for S/390.
+/* Multiple versions of rawmemchr.
    Copyright (C) 2015-2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -16,19 +16,26 @@
    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-rawmemchr.h>
+
+#if HAVE_RAWMEMCHR_IFUNC
+# define __rawmemchr __redirect___rawmemchr
 # include <string.h>
+# undef __rawmemchr
+# include <ifunc-resolve.h>
 
-# define RAWMEMCHR  __rawmemchr_c
-# undef weak_alias
-# define weak_alias(a, b)
-# ifdef SHARED
-#  undef libc_hidden_def
-#  define libc_hidden_def(name)				\
-     __hidden_ver1 (__rawmemchr_c, __GI___rawmemchr, __rawmemchr_c);
-# endif /* SHARED */
+# if HAVE_RAWMEMCHR_C
+extern __typeof (__redirect___rawmemchr) RAWMEMCHR_C attribute_hidden;
+# endif
 
-extern __typeof (rawmemchr) __rawmemchr_c attribute_hidden;
+# if HAVE_RAWMEMCHR_Z13
+extern __typeof (__redirect___rawmemchr) RAWMEMCHR_Z13 attribute_hidden;
+# endif
 
-# include <string/rawmemchr.c>
-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
+s390_libc_ifunc_expr (__redirect___rawmemchr, __rawmemchr,
+		      (HAVE_RAWMEMCHR_Z13 && (hwcap & HWCAP_S390_VX))
+		      ? RAWMEMCHR_Z13
+		      : RAWMEMCHR_DEFAULT
+		      )
+weak_alias (__rawmemchr, rawmemchr)
+#endif /* HAVE_RAWMEMCHR_IFUNC  */