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commit 316b88421993d540513a6b25b59ec16df267e9b4
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:13 2018 +0100
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S390: Refactor strncmp ifunc handling.
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The ifunc handling for strncmp 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 strncmp variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add strncmp variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for strncmp.
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* sysdeps/s390/multiarch/strncmp-c.c: Move to ...
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* sysdeps/s390/strncmp-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strncmp-vx.S: Move to ...
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* sysdeps/s390/strncmp-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strncmp.c: Move to ...
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* sysdeps/s390/strncmp.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-strncmp.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index 71a4658b43aeb745..adf3521876725ac8 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -45,5 +45,6 @@ sysdep_routines += bzero memset memset-z900 \
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stpncpy stpncpy-vx stpncpy-c \
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strcat strcat-vx strcat-c \
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strncat strncat-vx strncat-c \
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- strcmp strcmp-vx strcmp-z900
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+ strcmp strcmp-vx strcmp-z900 \
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+ strncmp strncmp-vx strncmp-c
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endif
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diff --git a/sysdeps/s390/ifunc-strncmp.h b/sysdeps/s390/ifunc-strncmp.h
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new file mode 100644
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index 0000000000000000..511b3e9720520a0c
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-strncmp.h
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@@ -0,0 +1,52 @@
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+/* strncmp 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_STRNCMP_IFUNC 1
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+#else
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+# define HAVE_STRNCMP_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_STRNCMP_IFUNC_AND_VX_SUPPORT HAVE_STRNCMP_IFUNC
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+#else
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+# define HAVE_STRNCMP_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 STRNCMP_DEFAULT STRNCMP_Z13
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+# define HAVE_STRNCMP_C 0
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+# define HAVE_STRNCMP_Z13 1
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+#else
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+# define STRNCMP_DEFAULT STRNCMP_C
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+# define HAVE_STRNCMP_C 1
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+# define HAVE_STRNCMP_Z13 HAVE_STRNCMP_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_STRNCMP_C
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+# define STRNCMP_C __strncmp_c
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+#else
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+# define STRNCMP_C NULL
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+#endif
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+
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+#if HAVE_STRNCMP_Z13
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+# define STRNCMP_Z13 __strncmp_vx
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+#else
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+# define STRNCMP_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 97421a499625c7f2..381376bf9fcb0f58 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),string)
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-sysdep_routines += strncmp strncmp-vx strncmp-c \
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- strchr strchr-vx strchr-c \
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+sysdep_routines += strchr strchr-vx strchr-c \
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strchrnul strchrnul-vx strchrnul-c \
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strrchr strrchr-vx strrchr-c \
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strspn strspn-vx strspn-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 44637c431b144c66..d982de5788c0b5d5 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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@@ -35,6 +35,7 @@
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#include <ifunc-strcat.h>
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#include <ifunc-strncat.h>
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#include <ifunc-strcmp.h>
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+#include <ifunc-strncmp.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -281,6 +282,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_STRCMP_IFUNC */
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+#if HAVE_STRNCMP_IFUNC
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+ IFUNC_IMPL (i, name, strncmp,
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+# if HAVE_STRNCMP_Z13
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+ IFUNC_IMPL_ADD (array, i, strncmp,
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+ dl_hwcap & HWCAP_S390_VX, STRNCMP_Z13)
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+# endif
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+# if HAVE_STRNCMP_C
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+ IFUNC_IMPL_ADD (array, i, strncmp, 1, STRNCMP_C)
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+# endif
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+ )
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+#endif /* HAVE_STRNCMP_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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@@ -307,7 +320,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wcscmp);
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- IFUNC_VX_IMPL (strncmp);
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IFUNC_VX_IMPL (wcsncmp);
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IFUNC_VX_IMPL (strchr);
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diff --git a/sysdeps/s390/multiarch/strncmp-c.c b/sysdeps/s390/strncmp-c.c
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similarity index 78%
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rename from sysdeps/s390/multiarch/strncmp-c.c
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rename to sysdeps/s390/strncmp-c.c
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index e54277ec1b10f8d7..c7ffdb03e37dc8d8 100644
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--- a/sysdeps/s390/multiarch/strncmp-c.c
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+++ b/sysdeps/s390/strncmp-c.c
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@@ -16,13 +16,17 @@
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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 STRNCMP __strncmp_c
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-# ifdef SHARED
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-# undef libc_hidden_builtin_def
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-# define libc_hidden_builtin_def(name) \
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+#include <ifunc-strncmp.h>
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+
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+#if HAVE_STRNCMP_C
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+# if HAVE_STRNCMP_IFUNC
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+# define STRNCMP STRNCMP_C
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+# if defined SHARED && IS_IN (libc)
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+# undef libc_hidden_builtin_def
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+# define libc_hidden_builtin_def(name) \
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__hidden_ver1 (__strncmp_c, __GI_strncmp, __strncmp_c);
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-# endif /* SHARED */
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+# endif
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+# endif
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# include <string/strncmp.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/strncmp-vx.S b/sysdeps/s390/strncmp-vx.S
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similarity index 93%
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rename from sysdeps/s390/multiarch/strncmp-vx.S
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rename to sysdeps/s390/strncmp-vx.S
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index 168fd657da2a1173..f557afb336d418ff 100644
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--- a/sysdeps/s390/multiarch/strncmp-vx.S
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+++ b/sysdeps/s390/strncmp-vx.S
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@@ -16,7 +16,9 @@
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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-strncmp.h>
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+
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+#if HAVE_STRNCMP_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -37,7 +39,7 @@
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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(__strncmp_vx)
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+ENTRY(STRNCMP_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -133,5 +135,14 @@ ENTRY(__strncmp_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(__strncmp_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+END(STRNCMP_Z13)
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+
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+# if ! HAVE_STRNCMP_IFUNC
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+strong_alias (STRNCMP_Z13, strncmp)
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+# endif
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+
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+# if ! HAVE_STRNCMP_C && defined SHARED && IS_IN (libc)
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+strong_alias (STRNCMP_Z13, __GI_strncmp)
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+# endif
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+
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+#endif /* HAVE_STRNCMP_Z13 */
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diff --git a/sysdeps/s390/multiarch/strncmp.c b/sysdeps/s390/strncmp.c
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similarity index 70%
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rename from sysdeps/s390/multiarch/strncmp.c
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rename to sysdeps/s390/strncmp.c
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index 0ec472c3b03419a3..71351273c4058129 100644
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--- a/sysdeps/s390/multiarch/strncmp.c
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+++ b/sysdeps/s390/strncmp.c
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@@ -16,7 +16,9 @@
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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-strncmp.h>
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+
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+#if HAVE_STRNCMP_IFUNC
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# define strncmp __redirect_strncmp
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/* Omit the strncmp inline definitions because it would redefine strncmp. */
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# define __NO_STRING_INLINES
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@@ -24,8 +26,17 @@
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# undef strncmp
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc2_redirected (__redirect_strncmp, __strncmp, strncmp)
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+# if HAVE_STRNCMP_C
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+extern __typeof (__redirect_strncmp) STRNCMP_C attribute_hidden;
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+# endif
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+
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+# if HAVE_STRNCMP_Z13
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+extern __typeof (__redirect_strncmp) STRNCMP_Z13 attribute_hidden;
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+# endif
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-#else
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-# include <string/strncmp.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+s390_libc_ifunc_expr (__redirect_strncmp, strncmp,
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+ (HAVE_STRNCMP_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? STRNCMP_Z13
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+ : STRNCMP_DEFAULT
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+ )
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+#endif /* HAVE_STRNCMP_IFUNC */
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