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commit e9873e1d47c870d707117ada91c9be21e3bf1537
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:21 2018 +0100
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S390: Refactor wcsncmp ifunc handling.
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The ifunc handling for wcsncmp is adjusted in order to omit ifunc
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variants if those will never be used as the minimum architecture level
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already supports newer CPUs by default.
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ChangeLog:
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Remove wcsncmp variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add wcsncmp variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for wcsncmp.
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* sysdeps/s390/multiarch/wcsncmp-c.c: Move to ...
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* sysdeps/s390/wcsncmp-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/wcsncmp-vx.S: Move to ...
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* sysdeps/s390/wcsncmp-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/wcsncmp.c: Move to ...
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* sysdeps/s390/wcsncmp.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-wcsncmp.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index fb104af231c48d3a..9146b32a939fd5bd 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -68,5 +68,6 @@ sysdep_routines += wcslen wcslen-vx wcslen-c \
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wcpncpy wcpncpy-vx wcpncpy-c \
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wcscat wcscat-vx wcscat-c \
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wcsncat wcsncat-vx wcsncat-c \
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- wcscmp wcscmp-vx wcscmp-c
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+ wcscmp wcscmp-vx wcscmp-c \
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+ wcsncmp wcsncmp-vx wcsncmp-c
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endif
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diff --git a/sysdeps/s390/ifunc-wcsncmp.h b/sysdeps/s390/ifunc-wcsncmp.h
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new file mode 100644
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index 0000000000000000..3a22bc9c126107ad
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-wcsncmp.h
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@@ -0,0 +1,52 @@
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+/* wcsncmp variant information on S/390 version.
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+ Copyright (C) 2018 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#if defined USE_MULTIARCH && IS_IN (libc) \
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+ && ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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+# define HAVE_WCSNCMP_IFUNC 1
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+#else
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+# define HAVE_WCSNCMP_IFUNC 0
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+#endif
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+
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+#ifdef HAVE_S390_VX_ASM_SUPPORT
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+# define HAVE_WCSNCMP_IFUNC_AND_VX_SUPPORT HAVE_WCSNCMP_IFUNC
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+#else
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+# define HAVE_WCSNCMP_IFUNC_AND_VX_SUPPORT 0
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+#endif
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+
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+#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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+# define WCSNCMP_DEFAULT WCSNCMP_Z13
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+# define HAVE_WCSNCMP_C 0
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+# define HAVE_WCSNCMP_Z13 1
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+#else
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+# define WCSNCMP_DEFAULT WCSNCMP_C
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+# define HAVE_WCSNCMP_C 1
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+# define HAVE_WCSNCMP_Z13 HAVE_WCSNCMP_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_WCSNCMP_C
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+# define WCSNCMP_C __wcsncmp_c
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+#else
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+# define WCSNCMP_C NULL
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+#endif
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+
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+#if HAVE_WCSNCMP_Z13
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+# define WCSNCMP_Z13 __wcsncmp_vx
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+#else
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+# define WCSNCMP_Z13 NULL
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+#endif
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diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
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index 70162d0eaa6a0dee..d1740fa8e4f5faa8 100644
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--- a/sysdeps/s390/multiarch/Makefile
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+++ b/sysdeps/s390/multiarch/Makefile
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@@ -1,6 +1,5 @@
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ifeq ($(subdir),wcsmbs)
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-sysdep_routines += wcsncmp wcsncmp-vx wcsncmp-c \
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- wcschr wcschr-vx wcschr-c \
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+sysdep_routines += wcschr wcschr-vx wcschr-c \
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wcschrnul wcschrnul-vx wcschrnul-c \
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wcsrchr wcsrchr-vx wcsrchr-c \
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wcsspn wcsspn-vx wcsspn-c \
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diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
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index f461063c80b364fb..8c9e788ae5962e2a 100644
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--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
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+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
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@@ -55,6 +55,7 @@
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#include <ifunc-wcscat.h>
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#include <ifunc-wcsncat.h>
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#include <ifunc-wcscmp.h>
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+#include <ifunc-wcsncmp.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -541,6 +542,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_WCSCMP_IFUNC */
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+#if HAVE_WCSNCMP_IFUNC
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+ IFUNC_IMPL (i, name, wcsncmp,
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+# if HAVE_WCSNCMP_Z13
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+ IFUNC_IMPL_ADD (array, i, wcsncmp,
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+ dl_hwcap & HWCAP_S390_VX, WCSNCMP_Z13)
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+# endif
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+# if HAVE_WCSNCMP_C
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+ IFUNC_IMPL_ADD (array, i, wcsncmp, 1, WCSNCMP_C)
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+# endif
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+ )
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+#endif /* HAVE_WCSNCMP_IFUNC */
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+
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#ifdef HAVE_S390_VX_ASM_SUPPORT
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# define IFUNC_VX_IMPL(FUNC) \
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@@ -549,8 +562,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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__##FUNC##_vx) \
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IFUNC_IMPL_ADD (array, i, FUNC, 1, __##FUNC##_c))
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- IFUNC_VX_IMPL (wcsncmp);
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-
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IFUNC_VX_IMPL (wcschr);
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IFUNC_VX_IMPL (wcschrnul);
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diff --git a/sysdeps/s390/multiarch/wcsncmp-c.c b/sysdeps/s390/wcsncmp-c.c
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similarity index 85%
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rename from sysdeps/s390/multiarch/wcsncmp-c.c
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rename to sysdeps/s390/wcsncmp-c.c
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index 92ab5e8b50bd93d0..a9ccb8de8276e97c 100644
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--- a/sysdeps/s390/multiarch/wcsncmp-c.c
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+++ b/sysdeps/s390/wcsncmp-c.c
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@@ -16,10 +16,12 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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-# define WCSNCMP __wcsncmp_c
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+#include <ifunc-wcsncmp.h>
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+
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+#if HAVE_WCSNCMP_C
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+# if HAVE_WCSNCMP_IFUNC
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+# define WCSNCMP WCSNCMP_C
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+# endif
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-# include <wchar.h>
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-extern __typeof (wcsncmp) __wcsncmp_c;
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# include <wcsmbs/wcsncmp.c>
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#endif
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diff --git a/sysdeps/s390/multiarch/wcsncmp-vx.S b/sysdeps/s390/wcsncmp-vx.S
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similarity index 97%
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rename from sysdeps/s390/multiarch/wcsncmp-vx.S
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rename to sysdeps/s390/wcsncmp-vx.S
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index 34c203bc90b2b012..9bdd21acefc2d44d 100644
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--- a/sysdeps/s390/multiarch/wcsncmp-vx.S
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+++ b/sysdeps/s390/wcsncmp-vx.S
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@@ -16,7 +16,8 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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+#include <ifunc-wcsncmp.h>
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+#if HAVE_WCSNCMP_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -37,7 +38,7 @@
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-v17=part of s2
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-v18=index of unequal
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*/
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-ENTRY(__wcsncmp_vx)
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+ENTRY(WCSNCMP_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -173,5 +174,9 @@ ENTRY(__wcsncmp_vx)
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lghi %r1,-1
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locgrl %r2,%r1
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br %r14
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-END(__wcsncmp_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+END(WCSNCMP_Z13)
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+
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+# if ! HAVE_WCSNCMP_IFUNC
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+strong_alias (WCSNCMP_Z13, wcsncmp)
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+# endif
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+#endif
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diff --git a/sysdeps/s390/multiarch/wcsncmp.c b/sysdeps/s390/wcsncmp.c
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similarity index 69%
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rename from sysdeps/s390/multiarch/wcsncmp.c
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rename to sysdeps/s390/wcsncmp.c
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index ee5f08c1e4106495..101db445918b0f7d 100644
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--- a/sysdeps/s390/multiarch/wcsncmp.c
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+++ b/sysdeps/s390/wcsncmp.c
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@@ -16,12 +16,23 @@
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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-#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
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+#include <ifunc-wcsncmp.h>
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+
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+#if HAVE_WCSNCMP_IFUNC
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# include <wchar.h>
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc2 (__wcsncmp, wcsncmp)
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+# if HAVE_WCSNCMP_C
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+extern __typeof (wcsncmp) WCSNCMP_C attribute_hidden;
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+# endif
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+
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+# if HAVE_WCSNCMP_Z13
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+extern __typeof (wcsncmp) WCSNCMP_Z13 attribute_hidden;
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+# endif
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-#else
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-# include <wcsmbs/wcsncmp.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+s390_libc_ifunc_expr (wcsncmp, wcsncmp,
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+ (HAVE_WCSNCMP_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? WCSNCMP_Z13
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+ : WCSNCMP_DEFAULT
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+ )
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+#endif
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