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265 lines
8.5 KiB
265 lines
8.5 KiB
2 years ago
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commit 5d2ec20a997b87c1667e0e71b3ff1e9df96eac15
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:15 2018 +0100
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S390: Refactor strcspn ifunc handling.
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The ifunc handling for strcspn 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 strcspn variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add strcspn variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for strcspn.
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* sysdeps/s390/multiarch/strcspn-c.c: Move to ...
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* sysdeps/s390/strcspn-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strcspn-vx.S: Move to ...
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* sysdeps/s390/strcspn-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/strcspn.c: Move to ...
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* sysdeps/s390/strcspn.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-strcspn.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index a21fa7507b1d64a1..092d55826fbd15a5 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -51,5 +51,6 @@ sysdep_routines += bzero memset memset-z900 \
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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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- strpbrk strpbrk-vx strpbrk-c
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+ strpbrk strpbrk-vx strpbrk-c \
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+ strcspn strcspn-vx strcspn-c
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endif
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diff --git a/sysdeps/s390/ifunc-strcspn.h b/sysdeps/s390/ifunc-strcspn.h
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new file mode 100644
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index 0000000000000000..9b7032509a2fb9a8
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-strcspn.h
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@@ -0,0 +1,52 @@
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+/* strcspn 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_STRCSPN_IFUNC 1
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+#else
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+# define HAVE_STRCSPN_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_STRCSPN_IFUNC_AND_VX_SUPPORT HAVE_STRCSPN_IFUNC
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+#else
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+# define HAVE_STRCSPN_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 STRCSPN_DEFAULT STRCSPN_Z13
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+# define HAVE_STRCSPN_C 0
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+# define HAVE_STRCSPN_Z13 1
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+#else
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+# define STRCSPN_DEFAULT STRCSPN_C
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+# define HAVE_STRCSPN_C 1
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+# define HAVE_STRCSPN_Z13 HAVE_STRCSPN_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_STRCSPN_C
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+# define STRCSPN_C __strcspn_c
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+#else
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+# define STRCSPN_C NULL
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+#endif
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+
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+#if HAVE_STRCSPN_Z13
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+# define STRCSPN_Z13 __strcspn_vx
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+#else
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+# define STRCSPN_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 1a3fed9fc88012d1..1578f21af4a1bd06 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 += strcspn strcspn-vx strcspn-c \
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- memchr memchr-vx \
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+sysdep_routines += memchr memchr-vx \
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rawmemchr rawmemchr-vx rawmemchr-c \
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memccpy memccpy-vx memccpy-c \
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memrchr memrchr-vx memrchr-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 8e23416730f8a8d5..2d48c99c8d5663fe 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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@@ -41,6 +41,7 @@
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#include <ifunc-strrchr.h>
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#include <ifunc-strspn.h>
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#include <ifunc-strpbrk.h>
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+#include <ifunc-strcspn.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -359,6 +360,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_STRPBRK_IFUNC */
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+#if HAVE_STRCSPN_IFUNC
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+ IFUNC_IMPL (i, name, strcspn,
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+# if HAVE_STRCSPN_Z13
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+ IFUNC_IMPL_ADD (array, i, strcspn,
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+ dl_hwcap & HWCAP_S390_VX, STRCSPN_Z13)
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+# endif
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+# if HAVE_STRCSPN_C
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+ IFUNC_IMPL_ADD (array, i, strcspn, 1, STRCSPN_C)
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+# endif
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+ )
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+#endif /* HAVE_STRCSPN_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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@@ -397,7 +410,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wcspbrk);
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- IFUNC_VX_IMPL (strcspn);
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IFUNC_VX_IMPL (wcscspn);
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IFUNC_VX_IMPL (memchr);
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diff --git a/sysdeps/s390/multiarch/strcspn-c.c b/sysdeps/s390/strcspn-c.c
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similarity index 73%
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rename from sysdeps/s390/multiarch/strcspn-c.c
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rename to sysdeps/s390/strcspn-c.c
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index 7b454f5b56077abc..9f51f92bdbd49a67 100644
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--- a/sysdeps/s390/multiarch/strcspn-c.c
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+++ b/sysdeps/s390/strcspn-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 STRCSPN __strcspn_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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- __hidden_ver1 (__strcspn_c, __GI_strcspn, __strcspn_c);
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-# endif /* SHARED */
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+#include <ifunc-strcspn.h>
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+
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+#if HAVE_STRCSPN_C
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+# if HAVE_STRCSPN_IFUNC
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+# define STRCSPN STRCSPN_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 (__strcspn_c, __GI_strcspn, __strcspn_c);
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+# endif
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+# endif
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# include <string/strcspn.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/strcspn-vx.S b/sysdeps/s390/strcspn-vx.S
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similarity index 97%
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rename from sysdeps/s390/multiarch/strcspn-vx.S
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rename to sysdeps/s390/strcspn-vx.S
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index ea1668742bd1c7ff..ff5b1be549e6e210 100644
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--- a/sysdeps/s390/multiarch/strcspn-vx.S
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+++ b/sysdeps/s390/strcspn-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-strcspn.h>
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+
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+#if HAVE_STRCSPN_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -58,7 +60,7 @@
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otherwise =0;
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r9: loaded byte count of vlbb reject-string
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*/
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-ENTRY(__strcspn_vx)
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+ENTRY(STRCSPN_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -277,5 +279,14 @@ ENTRY(__strcspn_vx)
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vlgvg %r8,%v31,0
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vlgvg %r9,%v31,1
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br %r14
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-END(__strcspn_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+END(STRCSPN_Z13)
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+
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+# if ! HAVE_STRCSPN_IFUNC
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+strong_alias (STRCSPN_Z13, strcspn)
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+# endif
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+
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+# if ! HAVE_STRCSPN_C && defined SHARED && IS_IN (libc)
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+strong_alias (STRCSPN_Z13, __GI_strcspn)
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+# endif
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+
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+#endif /* HAVE_STRCSPN_Z13 */
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diff --git a/sysdeps/s390/multiarch/strcspn.c b/sysdeps/s390/strcspn.c
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similarity index 70%
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rename from sysdeps/s390/multiarch/strcspn.c
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rename to sysdeps/s390/strcspn.c
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index 418ffcdded76fe50..a3f35d39c50dd5e5 100644
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--- a/sysdeps/s390/multiarch/strcspn.c
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+++ b/sysdeps/s390/strcspn.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-strcspn.h>
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+
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+#if HAVE_STRCSPN_IFUNC
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# define strcspn __redirect_strcspn
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/* Omit the strcspn inline definitions because it would redefine strcspn. */
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# define __NO_STRING_INLINES
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@@ -24,8 +26,17 @@
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# undef strcspn
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc2_redirected (__redirect_strcspn, __strcspn, strcspn)
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+# if HAVE_STRCSPN_C
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+extern __typeof (__redirect_strcspn) STRCSPN_C attribute_hidden;
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+# endif
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+
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+# if HAVE_STRCSPN_Z13
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+extern __typeof (__redirect_strcspn) STRCSPN_Z13 attribute_hidden;
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+# endif
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-#else
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-# include <string/strcspn.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+s390_libc_ifunc_expr (__redirect_strcspn, strcspn,
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+ (HAVE_STRCSPN_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? STRCSPN_Z13
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+ : STRCSPN_DEFAULT
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+ )
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+#endif /* HAVE_STRCSPN_IFUNC */
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