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commit 3459e23dd4ae4aa8999df7111d833a0bb9add7cd
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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 wcscmp ifunc handling.
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The ifunc handling for wcscmp 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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Glibc internal calls will then also use the "newer" ifunc variant.
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ChangeLog:
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Remove wcscmp variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add wcscmp variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for wcscmp.
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* sysdeps/s390/multiarch/wcscmp-c.c: Move to ...
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* sysdeps/s390/wcscmp-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/wcscmp-vx.S: Move to ...
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* sysdeps/s390/wcscmp-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/wcscmp.c: Move to ...
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* sysdeps/s390/wcscmp.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-wcscmp.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index cafabe62165f0213..fb104af231c48d3a 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -67,5 +67,6 @@ sysdep_routines += wcslen wcslen-vx wcslen-c \
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wcsncpy wcsncpy-vx wcsncpy-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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+ wcsncat wcsncat-vx wcsncat-c \
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+ wcscmp wcscmp-vx wcscmp-c
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endif
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diff --git a/sysdeps/s390/ifunc-wcscmp.h b/sysdeps/s390/ifunc-wcscmp.h
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new file mode 100644
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index 0000000000000000..99fe0213021458ae
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-wcscmp.h
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@@ -0,0 +1,52 @@
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+/* wcscmp 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_WCSCMP_IFUNC 1
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+#else
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+# define HAVE_WCSCMP_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_WCSCMP_IFUNC_AND_VX_SUPPORT HAVE_WCSCMP_IFUNC
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+#else
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+# define HAVE_WCSCMP_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 WCSCMP_DEFAULT WCSCMP_Z13
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+# define HAVE_WCSCMP_C 0
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+# define HAVE_WCSCMP_Z13 1
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+#else
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+# define WCSCMP_DEFAULT WCSCMP_C
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+# define HAVE_WCSCMP_C 1
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+# define HAVE_WCSCMP_Z13 HAVE_WCSCMP_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_WCSCMP_C
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+# define WCSCMP_C __wcscmp_c
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+#else
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+# define WCSCMP_C NULL
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+#endif
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+
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+#if HAVE_WCSCMP_Z13
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+# define WCSCMP_Z13 __wcscmp_vx
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+#else
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+# define WCSCMP_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 6cb75950c2c453f6..70162d0eaa6a0dee 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 += wcscmp wcscmp-vx wcscmp-c \
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- wcsncmp wcsncmp-vx wcsncmp-c \
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+sysdep_routines += wcsncmp wcsncmp-vx wcsncmp-c \
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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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diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
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index 7b7b1e7497ec1a4f..f461063c80b364fb 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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@@ -54,6 +54,7 @@
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#include <ifunc-wcpncpy.h>
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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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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -528,6 +529,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_WCSNCAT_IFUNC */
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+#if HAVE_WCSCMP_IFUNC
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+ IFUNC_IMPL (i, name, wcscmp,
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+# if HAVE_WCSCMP_Z13
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+ IFUNC_IMPL_ADD (array, i, wcscmp,
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+ dl_hwcap & HWCAP_S390_VX, WCSCMP_Z13)
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+# endif
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+# if HAVE_WCSCMP_C
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+ IFUNC_IMPL_ADD (array, i, wcscmp, 1, WCSCMP_C)
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+# endif
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+ )
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+#endif /* HAVE_WCSCMP_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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@@ -536,8 +549,6 @@ __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 (wcscmp);
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-
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IFUNC_VX_IMPL (wcsncmp);
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IFUNC_VX_IMPL (wcschr);
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diff --git a/sysdeps/s390/multiarch/wcscmp-c.c b/sysdeps/s390/wcscmp-c.c
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similarity index 72%
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rename from sysdeps/s390/multiarch/wcscmp-c.c
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rename to sysdeps/s390/wcscmp-c.c
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index ce0817ae97deab77..643ba7a682469e73 100644
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--- a/sysdeps/s390/multiarch/wcscmp-c.c
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+++ b/sysdeps/s390/wcscmp-c.c
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@@ -16,17 +16,19 @@
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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 WCSCMP __wcscmp_c
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+#include <ifunc-wcscmp.h>
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-# include <wchar.h>
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-extern __typeof (wcscmp) __wcscmp_c;
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-# undef weak_alias
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-# define weak_alias(name, alias)
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-# ifdef SHARED
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-# undef libc_hidden_def
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-# define libc_hidden_def(name) \
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+#if HAVE_WCSCMP_C
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+# if HAVE_WCSCMP_IFUNC
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+# define WCSCMP WCSCMP_C
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+# undef weak_alias
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+# define weak_alias(name, alias)
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+# if defined SHARED && IS_IN (libc)
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+# undef libc_hidden_def
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+# define libc_hidden_def(name) \
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__hidden_ver1 (__wcscmp_c, __GI___wcscmp, __wcscmp_c);
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-# endif /* SHARED */
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+# endif
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+# endif
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+
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# include <wcsmbs/wcscmp.c>
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+#endif
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diff --git a/sysdeps/s390/multiarch/wcscmp-vx.S b/sysdeps/s390/wcscmp-vx.S
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similarity index 92%
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rename from sysdeps/s390/multiarch/wcscmp-vx.S
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rename to sysdeps/s390/wcscmp-vx.S
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index 14267dbfc7d9b936..a2789d8a693802cc 100644
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--- a/sysdeps/s390/multiarch/wcscmp-vx.S
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+++ b/sysdeps/s390/wcscmp-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-wcscmp.h>
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+#if HAVE_WCSCMP_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -36,7 +37,7 @@
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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(__wcscmp_vx)
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+ENTRY(WCSCMP_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -127,5 +128,14 @@ ENTRY(__wcscmp_vx)
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.Lend_equal:
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lghi %r2,0
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br %r14
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-END(__wcscmp_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+END(WCSCMP_Z13)
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+
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+# if ! HAVE_WCSCMP_IFUNC
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+strong_alias (WCSCMP_Z13, __wcscmp)
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+weak_alias (__wcscmp, wcscmp)
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+# endif
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+
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+# if ! HAVE_WCSCMP_C && defined SHARED && IS_IN (libc)
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+strong_alias (WCSCMP_Z13, __GI___wcscmp)
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+# endif
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+#endif
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diff --git a/sysdeps/s390/multiarch/wcscmp.c b/sysdeps/s390/wcscmp.c
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similarity index 70%
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rename from sysdeps/s390/multiarch/wcscmp.c
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rename to sysdeps/s390/wcscmp.c
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index 5ee0fd4d881db9cb..769c73506e40c3a0 100644
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--- a/sysdeps/s390/multiarch/wcscmp.c
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+++ b/sysdeps/s390/wcscmp.c
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@@ -16,15 +16,26 @@
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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-wcscmp.h>
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+
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+#if HAVE_WCSCMP_IFUNC
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# define __wcscmp __redirect___wcscmp
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# include <wchar.h>
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# undef __wcscmp
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc_redirected (__redirect___wcscmp, __wcscmp)
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-weak_alias (__wcscmp, wcscmp)
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+# if HAVE_WCSCMP_C
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+extern __typeof (__redirect___wcscmp) WCSCMP_C attribute_hidden;
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+# endif
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-#else
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-# include <wcsmbs/wcscmp.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+# if HAVE_WCSCMP_Z13
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+extern __typeof (__redirect___wcscmp) WCSCMP_Z13 attribute_hidden;
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+# endif
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+
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+s390_libc_ifunc_expr (__redirect___wcscmp, __wcscmp,
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+ (HAVE_WCSCMP_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? WCSCMP_Z13
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+ : WCSCMP_DEFAULT
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+ )
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+weak_alias (__wcscmp, wcscmp)
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+#endif
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