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[PATCH 37/56] S390: Refactor wcsnlen ifunc handling.

From: Stefan Liebler <stli at linux dot ibm dot com>
To: libc-alpha at sourceware dot org
Cc: Stefan Liebler <stli at linux dot ibm dot com>
Date: Fri, 30 Nov 2018 16:58:15 +0100
Subject: [PATCH 37/56] S390: Refactor wcsnlen ifunc handling.
References: <1543593514-10251-1-git-send-email-stli@linux.ibm.com>
The ifunc handling for wcsnlen is adjusted in order to omit ifunc
if the minimum architecture level already supports newer CPUs by default.
Unfortunately the c ifunc variant can't be omitted at all as it is used
by the z13 ifunc variant as fallback if the pointers are not 4-byte aligned.
Glibc internal calls will use the "newer" ifunc variant.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile
	(sysdep_routines): Remove wcsnlen variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add wcsnlen variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for wcsnlen.
	* sysdeps/s390/multiarch/wcsnlen-c.c: Move to ...
	* sysdeps/s390/wcsnlen-c.c: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/wcsnlen-vx.S: Move to ...
	* sysdeps/s390/wcsnlen-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/wcsnlen.c: Move to ...
	* sysdeps/s390/wcsnlen.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-wcsnlen.h: New file.
---
 sysdeps/s390/Makefile                     |  3 +-
 sysdeps/s390/ifunc-wcsnlen.h              | 53 +++++++++++++++++++++++
 sysdeps/s390/multiarch/Makefile           |  3 +-
 sysdeps/s390/multiarch/ifunc-impl-list.c  | 15 ++++++-
 sysdeps/s390/{multiarch => }/wcsnlen-c.c  | 10 +++--
 sysdeps/s390/{multiarch => }/wcsnlen-vx.S | 16 ++++---
 sysdeps/s390/{multiarch => }/wcsnlen.c    | 23 +++++++---
 7 files changed, 103 insertions(+), 20 deletions(-)
 create mode 100644 sysdeps/s390/ifunc-wcsnlen.h
 rename sysdeps/s390/{multiarch => }/wcsnlen-c.c (85%)
 rename sysdeps/s390/{multiarch => }/wcsnlen-vx.S (95%)
 rename sysdeps/s390/{multiarch => }/wcsnlen.c (70%)

diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
index 10c0e1bea0..590d2207b7 100644
--- a/sysdeps/s390/Makefile
+++ b/sysdeps/s390/Makefile
@@ -83,5 +83,6 @@ sysdep_routines += bzero memset memset-z900 \
 endif
 
 ifeq ($(subdir),wcsmbs)
-sysdep_routines += wcslen wcslen-vx wcslen-c
+sysdep_routines += wcslen wcslen-vx wcslen-c \
+		   wcsnlen wcsnlen-vx wcsnlen-c
 endif
diff --git a/sysdeps/s390/ifunc-wcsnlen.h b/sysdeps/s390/ifunc-wcsnlen.h
new file mode 100644
index 0000000000..b5b21da2f1
--- /dev/null
+++ b/sysdeps/s390/ifunc-wcsnlen.h
@@ -0,0 +1,53 @@
+/* wcsnlen 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_WCSNLEN_IFUNC	1
+#else
+# define HAVE_WCSNLEN_IFUNC	0
+#endif
+
+#ifdef HAVE_S390_VX_ASM_SUPPORT
+# define HAVE_WCSNLEN_IFUNC_AND_VX_SUPPORT HAVE_WCSNLEN_IFUNC
+#else
+# define HAVE_WCSNLEN_IFUNC_AND_VX_SUPPORT 0
+#endif
+
+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
+# define WCSNLEN_DEFAULT	WCSNLEN_Z13
+/* The z13 ifunc variant is using the common code variant as fallback!  */
+# define HAVE_WCSNLEN_C		1
+# define HAVE_WCSNLEN_Z13	1
+#else
+# define WCSNLEN_DEFAULT	WCSNLEN_C
+# define HAVE_WCSNLEN_C		1
+# define HAVE_WCSNLEN_Z13	HAVE_WCSNLEN_IFUNC_AND_VX_SUPPORT
+#endif
+
+#if HAVE_WCSNLEN_C
+# define WCSNLEN_C		__wcsnlen_c
+#else
+# define WCSNLEN_C		NULL
+#endif
+
+#if HAVE_WCSNLEN_Z13
+# define WCSNLEN_Z13		__wcsnlen_vx
+#else
+# define WCSNLEN_Z13		NULL
+#endif
diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
index 421d40d020..ce2e7ce5f4 100644
--- a/sysdeps/s390/multiarch/Makefile
+++ b/sysdeps/s390/multiarch/Makefile
@@ -1,6 +1,5 @@
 ifeq ($(subdir),wcsmbs)
-sysdep_routines += wcsnlen wcsnlen-vx wcsnlen-c \
-		   wcscpy wcscpy-vx wcscpy-c \
+sysdep_routines += wcscpy wcscpy-vx wcscpy-c \
 		   wcpcpy wcpcpy-vx wcpcpy-c \
 		   wcsncpy wcsncpy-vx wcsncpy-c \
 		   wcpncpy wcpncpy-vx wcpncpy-c \
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index 7bf5f14c01..c199fd0e0b 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -47,6 +47,7 @@
 #include <ifunc-memccpy.h>
 #include <ifunc-memrchr.h>
 #include <ifunc-wcslen.h>
+#include <ifunc-wcsnlen.h>
 
 /* Maximum number of IFUNC implementations.  */
 #define MAX_IFUNC	3
@@ -437,6 +438,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 		)
 #endif /* HAVE_WCSLEN_IFUNC  */
 
+#if HAVE_WCSNLEN_IFUNC
+    IFUNC_IMPL (i, name, wcsnlen,
+# if HAVE_WCSNLEN_Z13
+		IFUNC_IMPL_ADD (array, i, wcsnlen,
+				dl_hwcap & HWCAP_S390_VX, WCSNLEN_Z13)
+# endif
+# if HAVE_WCSNLEN_C
+		IFUNC_IMPL_ADD (array, i, wcsnlen, 1, WCSNLEN_C)
+# endif
+		)
+#endif /* HAVE_WCSNLEN_IFUNC  */
+
 #ifdef HAVE_S390_VX_ASM_SUPPORT
 
 # define IFUNC_VX_IMPL(FUNC)						\
@@ -445,8 +458,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __##FUNC##_vx)				\
 	      IFUNC_IMPL_ADD (array, i, FUNC, 1, __##FUNC##_c))
 
-  IFUNC_VX_IMPL (wcsnlen);
-
   IFUNC_VX_IMPL (wcscpy);
 
   IFUNC_VX_IMPL (wcpcpy);
diff --git a/sysdeps/s390/multiarch/wcsnlen-c.c b/sysdeps/s390/wcsnlen-c.c
similarity index 85%
rename from sysdeps/s390/multiarch/wcsnlen-c.c
rename to sysdeps/s390/wcsnlen-c.c
index 8f43f5104f..7495a6f97c 100644
--- a/sysdeps/s390/multiarch/wcsnlen-c.c
+++ b/sysdeps/s390/wcsnlen-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 WCSNLEN  __wcsnlen_c
+#include <ifunc-wcsnlen.h>
+
+#if HAVE_WCSNLEN_C
+# if HAVE_WCSNLEN_IFUNC || HAVE_WCSNLEN_Z13
+#  define WCSNLEN WCSNLEN_C
+# endif
 
-# include <wchar.h>
-extern __typeof (__wcsnlen) __wcsnlen_c;
 # include <wcsmbs/wcsnlen.c>
 #endif
diff --git a/sysdeps/s390/multiarch/wcsnlen-vx.S b/sysdeps/s390/wcsnlen-vx.S
similarity index 95%
rename from sysdeps/s390/multiarch/wcsnlen-vx.S
rename to sysdeps/s390/wcsnlen-vx.S
index 420f29fbc0..47f4ca8284 100644
--- a/sysdeps/s390/multiarch/wcsnlen-vx.S
+++ b/sysdeps/s390/wcsnlen-vx.S
@@ -16,7 +16,8 @@
    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-wcsnlen.h>
+#if HAVE_WCSNLEN_Z13
 
 # include "sysdep.h"
 # include "asm-syntax.h"
@@ -34,7 +35,7 @@
    -r5=current_len and return_value
    -v16=part of s
 */
-ENTRY(__wcsnlen_vx)
+ENTRY(WCSNLEN_Z13)
 
 	.machine "z13"
 	.machinemode "zarch_nohighgprs"
@@ -146,6 +147,11 @@ ENTRY(__wcsnlen_vx)
 	j	.Llt64
 
 .Lfallback:
-	jg	__wcsnlen_c
-END(__wcsnlen_vx)
-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
+	jg	WCSNLEN_C
+END(WCSNLEN_Z13)
+
+# if ! HAVE_WCSNLEN_IFUNC
+strong_alias (WCSNLEN_Z13, __wcsnlen)
+weak_alias (__wcsnlen, wcsnlen)
+# endif
+#endif
diff --git a/sysdeps/s390/multiarch/wcsnlen.c b/sysdeps/s390/wcsnlen.c
similarity index 70%
rename from sysdeps/s390/multiarch/wcsnlen.c
rename to sysdeps/s390/wcsnlen.c
index 5234074b1f..b5c8ad9fde 100644
--- a/sysdeps/s390/multiarch/wcsnlen.c
+++ b/sysdeps/s390/wcsnlen.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-wcsnlen.h>
+
+#if HAVE_WCSNLEN_IFUNC
 # include <wchar.h>
 # include <ifunc-resolve.h>
 
-s390_vx_libc_ifunc (__wcsnlen)
-weak_alias (__wcsnlen, wcsnlen)
+# if HAVE_WCSNLEN_C
+extern __typeof (__wcsnlen) WCSNLEN_C attribute_hidden;
+# endif
 
-#else
-# include <wcsmbs/wcsnlen.c>
-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
+# if HAVE_WCSNLEN_Z13
+extern __typeof (__wcsnlen) WCSNLEN_Z13 attribute_hidden;
+# endif
+
+s390_libc_ifunc_expr (__wcsnlen, __wcsnlen,
+		      (HAVE_WCSNLEN_Z13 && (hwcap & HWCAP_S390_VX))
+		      ? WCSNLEN_Z13
+		      : WCSNLEN_DEFAULT
+		      )
+weak_alias (__wcsnlen, wcsnlen)
+#endif
-- 
2.17.0
References:
- [PATCH] S390: Refactor ifunc handling
  - From: Stefan Liebler
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