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commit 26ea8760877cf03272e98c21eb1a7745ceca76c4
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:14 2018 +0100
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S390: Refactor strrchr ifunc handling.
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The ifunc handling for strrchr 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 strrchr variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add strrchr variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for strrchr.
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* sysdeps/s390/multiarch/strrchr-c.c: Move to ...
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* sysdeps/s390/strrchr-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strrchr-vx.S: Move to ...
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* sysdeps/s390/strrchr-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strrchr.c: Move to ...
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* sysdeps/s390/strrchr.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-strrchr.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index c54bb82f4d4f8a67..3ad44c997e9f1f6b 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -48,5 +48,6 @@ sysdep_routines += bzero memset memset-z900 \
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strcmp strcmp-vx strcmp-z900 \
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strncmp strncmp-vx strncmp-c \
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strchr strchr-vx strchr-c \
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- strchrnul strchrnul-vx strchrnul-c
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+ strchrnul strchrnul-vx strchrnul-c \
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+ strrchr strrchr-vx strrchr-c
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endif
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diff --git a/sysdeps/s390/ifunc-strrchr.h b/sysdeps/s390/ifunc-strrchr.h
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new file mode 100644
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index 0000000000000000..7185fc32601f7388
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-strrchr.h
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@@ -0,0 +1,52 @@
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+/* strrchr 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_STRRCHR_IFUNC 1
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+#else
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+# define HAVE_STRRCHR_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_STRRCHR_IFUNC_AND_VX_SUPPORT HAVE_STRRCHR_IFUNC
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+#else
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+# define HAVE_STRRCHR_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 STRRCHR_DEFAULT STRRCHR_Z13
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+# define HAVE_STRRCHR_C 0
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+# define HAVE_STRRCHR_Z13 1
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+#else
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+# define STRRCHR_DEFAULT STRRCHR_C
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+# define HAVE_STRRCHR_C 1
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+# define HAVE_STRRCHR_Z13 HAVE_STRRCHR_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_STRRCHR_C
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+# define STRRCHR_C __strrchr_c
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+#else
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+# define STRRCHR_C NULL
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+#endif
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+
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+#if HAVE_STRRCHR_Z13
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+# define STRRCHR_Z13 __strrchr_vx
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+#else
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+# define STRRCHR_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 999a979fee1417b2..c8267555585b617e 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 += strrchr strrchr-vx strrchr-c \
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- strspn strspn-vx strspn-c \
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+sysdep_routines += strspn strspn-vx strspn-c \
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strpbrk strpbrk-vx strpbrk-c \
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strcspn strcspn-vx strcspn-c \
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memchr memchr-vx \
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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 0a47ffeac3492b3e..60cd705ffa4e2c35 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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@@ -38,6 +38,7 @@
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#include <ifunc-strncmp.h>
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#include <ifunc-strchr.h>
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#include <ifunc-strchrnul.h>
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+#include <ifunc-strrchr.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -320,6 +321,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_STRCHRNUL_IFUNC */
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+#if HAVE_STRRCHR_IFUNC
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+ IFUNC_IMPL (i, name, strrchr,
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+# if HAVE_STRRCHR_Z13
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+ IFUNC_IMPL_ADD (array, i, strrchr,
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+ dl_hwcap & HWCAP_S390_VX, STRRCHR_Z13)
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+# endif
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+# if HAVE_STRRCHR_C
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+ IFUNC_IMPL_ADD (array, i, strrchr, 1, STRRCHR_C)
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+# endif
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+ )
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+#endif /* HAVE_STRRCHR_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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@@ -352,7 +365,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wcschrnul);
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- IFUNC_VX_IMPL (strrchr);
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IFUNC_VX_IMPL (wcsrchr);
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IFUNC_VX_IMPL (strspn);
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diff --git a/sysdeps/s390/multiarch/strrchr-c.c b/sysdeps/s390/strrchr-c.c
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similarity index 77%
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rename from sysdeps/s390/multiarch/strrchr-c.c
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rename to sysdeps/s390/strrchr-c.c
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index 53ceb8086f0711c8..615f16da7d9db5ef 100644
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--- a/sysdeps/s390/multiarch/strrchr-c.c
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+++ b/sysdeps/s390/strrchr-c.c
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@@ -16,14 +16,18 @@
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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 STRRCHR __strrchr_c
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-# undef weak_alias
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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-strrchr.h>
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+
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+#if HAVE_STRRCHR_C
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+# if HAVE_STRRCHR_IFUNC
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+# define STRRCHR STRRCHR_C
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+# undef weak_alias
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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 (__strrchr_c, __GI_strrchr, __strrchr_c);
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-# endif /* SHARED */
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+# endif
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+# endif
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# include <string/strrchr.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/strrchr-vx.S b/sysdeps/s390/strrchr-vx.S
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similarity index 94%
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rename from sysdeps/s390/multiarch/strrchr-vx.S
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rename to sysdeps/s390/strrchr-vx.S
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index 8b3b989631f23de5..5f4ac14ee338c790 100644
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--- a/sysdeps/s390/multiarch/strrchr-vx.S
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+++ b/sysdeps/s390/strrchr-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-strrchr.h>
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+
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+#if HAVE_STRRCHR_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -39,7 +41,7 @@
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-v19=part of s with last occurence of c.
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-v20=permute pattern
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*/
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-ENTRY(__strrchr_vx)
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+ENTRY(STRRCHR_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -176,5 +178,15 @@ ENTRY(__strrchr_vx)
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.Lpermute_mask:
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.byte 0x0F,0x0E,0x0D,0x0C,0x0B,0x0A,0x09,0x08
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.byte 0x07,0x06,0x05,0x04,0x03,0x02,0x01,0x00
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-END(__strrchr_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+END(STRRCHR_Z13)
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+
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+# if ! HAVE_STRRCHR_IFUNC
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+strong_alias (STRRCHR_Z13, strrchr)
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+weak_alias (strrchr, rindex)
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+# endif
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+
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+# if ! HAVE_STRRCHR_C && defined SHARED && IS_IN (libc)
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+strong_alias (STRRCHR_Z13, __GI_strrchr)
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+# endif
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+
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+#endif /* HAVE_STRRCHR_Z13 */
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diff --git a/sysdeps/s390/multiarch/strrchr.c b/sysdeps/s390/strrchr.c
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similarity index 66%
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rename from sysdeps/s390/multiarch/strrchr.c
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rename to sysdeps/s390/strrchr.c
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index e00e25a3a4f51b1e..9a8cecff0b29c057 100644
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--- a/sysdeps/s390/multiarch/strrchr.c
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+++ b/sysdeps/s390/strrchr.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-strrchr.h>
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+
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+#if HAVE_STRRCHR_IFUNC
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# define strrchr __redirect_strrchr
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# include <string.h>
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# undef strrchr
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc2_redirected (__redirect_strrchr, __strrchr, strrchr)
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-weak_alias (strrchr, rindex);
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+# if HAVE_STRRCHR_C
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+extern __typeof (__redirect_strrchr) STRRCHR_C attribute_hidden;
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+# endif
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+
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+# if HAVE_STRRCHR_Z13
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+extern __typeof (__redirect_strrchr) STRRCHR_Z13 attribute_hidden;
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+# endif
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-#else
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-# include <string/strrchr.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+s390_libc_ifunc_expr (__redirect_strrchr, strrchr,
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+ (HAVE_STRRCHR_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? STRRCHR_Z13
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+ : STRRCHR_DEFAULT
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+ )
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+weak_alias (strrchr, rindex)
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+#endif /* HAVE_STRRCHR_IFUNC */
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