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250 lines
8.1 KiB
250 lines
8.1 KiB
2 years ago
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commit 4753713aaed400d88cfc598e25d504478120b065
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:22 2018 +0100
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S390: Refactor wcsrchr ifunc handling.
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The ifunc handling for wcsrchr is adjusted in order to omit ifunc
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if the minimum architecture level already supports newer CPUs by default.
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Unfortunately the c ifunc variant can't be omitted at all as it is used
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by the z13 ifunc variant as fallback if the pointers are not 4-byte aligned.
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ChangeLog:
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Remove wcsrchr variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add wcsrchr variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for wcsrchr.
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* sysdeps/s390/multiarch/wcsrchr-c.c: Move to ...
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* sysdeps/s390/wcsrchr-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/wcsrchr-vx.S: Move to ...
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* sysdeps/s390/wcsrchr-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/wcsrchr.c: Move to ...
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* sysdeps/s390/wcsrchr.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-wcsrchr.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index a6ebf11ad1913cc4..19a556eccf285e2f 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -71,5 +71,6 @@ sysdep_routines += wcslen wcslen-vx wcslen-c \
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wcscmp wcscmp-vx wcscmp-c \
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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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+ wcschrnul wcschrnul-vx wcschrnul-c \
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+ wcsrchr wcsrchr-vx wcsrchr-c
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endif
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diff --git a/sysdeps/s390/ifunc-wcsrchr.h b/sysdeps/s390/ifunc-wcsrchr.h
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new file mode 100644
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index 0000000000000000..4eec0c17074c99fc
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-wcsrchr.h
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@@ -0,0 +1,53 @@
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+/* wcsrchr 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_WCSRCHR_IFUNC 1
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+#else
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+# define HAVE_WCSRCHR_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_WCSRCHR_IFUNC_AND_VX_SUPPORT HAVE_WCSRCHR_IFUNC
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+#else
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+# define HAVE_WCSRCHR_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 WCSRCHR_DEFAULT WCSRCHR_Z13
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+/* The z13 ifunc variant is using the common code variant as fallback! */
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+# define HAVE_WCSRCHR_C 1
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+# define HAVE_WCSRCHR_Z13 1
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+#else
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+# define WCSRCHR_DEFAULT WCSRCHR_C
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+# define HAVE_WCSRCHR_C 1
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+# define HAVE_WCSRCHR_Z13 HAVE_WCSRCHR_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_WCSRCHR_C
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+# define WCSRCHR_C __wcsrchr_c
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+#else
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+# define WCSRCHR_C NULL
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+#endif
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+
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+#if HAVE_WCSRCHR_Z13
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+# define WCSRCHR_Z13 __wcsrchr_vx
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+#else
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+# define WCSRCHR_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 0eb01d5d84c60408..3d72cbb5f32e68f3 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 += wcsrchr wcsrchr-vx wcsrchr-c \
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- wcsspn wcsspn-vx wcsspn-c \
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+sysdep_routines += wcsspn wcsspn-vx wcsspn-c \
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wcspbrk wcspbrk-vx wcspbrk-c \
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wcscspn wcscspn-vx wcscspn-c \
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wmemchr wmemchr-vx wmemchr-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 553a76c39ecc87ae..ffb4d5b6872ef9db 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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@@ -58,6 +58,7 @@
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#include <ifunc-wcsncmp.h>
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#include <ifunc-wcschr.h>
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#include <ifunc-wcschrnul.h>
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+#include <ifunc-wcsrchr.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -580,6 +581,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_WCSCHRNUL_IFUNC */
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+#if HAVE_WCSRCHR_IFUNC
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+ IFUNC_IMPL (i, name, wcsrchr,
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+# if HAVE_WCSRCHR_Z13
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+ IFUNC_IMPL_ADD (array, i, wcsrchr,
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+ dl_hwcap & HWCAP_S390_VX, WCSRCHR_Z13)
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+# endif
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+# if HAVE_WCSRCHR_C
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+ IFUNC_IMPL_ADD (array, i, wcsrchr, 1, WCSRCHR_C)
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+# endif
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+ )
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+#endif /* HAVE_WCSRCHR_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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@@ -588,8 +601,6 @@ __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 (wcsrchr);
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-
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IFUNC_VX_IMPL (wcsspn);
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IFUNC_VX_IMPL (wcspbrk);
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diff --git a/sysdeps/s390/multiarch/wcsrchr-c.c b/sysdeps/s390/wcsrchr-c.c
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similarity index 85%
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rename from sysdeps/s390/multiarch/wcsrchr-c.c
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rename to sysdeps/s390/wcsrchr-c.c
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index 615250358ba9c00a..65164a897fb773f7 100644
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--- a/sysdeps/s390/multiarch/wcsrchr-c.c
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+++ b/sysdeps/s390/wcsrchr-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 WCSRCHR __wcsrchr_c
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+#include <ifunc-wcsrchr.h>
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+
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+#if HAVE_WCSRCHR_C
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+# if HAVE_WCSRCHR_IFUNC || HAVE_WCSRCHR_Z13
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+# define WCSRCHR WCSRCHR_C
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+# endif
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-# include <wchar.h>
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-extern __typeof (wcsrchr) __wcsrchr_c;
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# include <wcsmbs/wcsrchr.c>
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#endif
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diff --git a/sysdeps/s390/multiarch/wcsrchr-vx.S b/sysdeps/s390/wcsrchr-vx.S
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similarity index 97%
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rename from sysdeps/s390/multiarch/wcsrchr-vx.S
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rename to sysdeps/s390/wcsrchr-vx.S
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index e40a554e5d9a216d..c7b6585beaeaef53 100644
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--- a/sysdeps/s390/multiarch/wcsrchr-vx.S
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+++ b/sysdeps/s390/wcsrchr-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-wcsrchr.h>
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+#if HAVE_WCSRCHR_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -39,7 +40,7 @@
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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(__wcsrchr_vx)
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+ENTRY(WCSRCHR_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -185,6 +186,10 @@ ENTRY(__wcsrchr_vx)
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.byte 0x0C,0x0D,0x0E,0x0F,0x08,0x09,0x0A,0x0B
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.byte 0x04,0x05,0x06,0x07,0x00,0x01,0x02,0x03
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.Lfallback:
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- jg __wcsrchr_c
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-END(__wcsrchr_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+ jg WCSRCHR_C
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+END(WCSRCHR_Z13)
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+
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+# if ! HAVE_WCSRCHR_IFUNC
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+strong_alias (WCSRCHR_Z13, wcsrchr)
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+# endif
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+#endif
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diff --git a/sysdeps/s390/multiarch/wcsrchr.c b/sysdeps/s390/wcsrchr.c
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similarity index 69%
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rename from sysdeps/s390/multiarch/wcsrchr.c
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rename to sysdeps/s390/wcsrchr.c
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index aa0b8a8f82545f64..eb70f270383880f2 100644
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--- a/sysdeps/s390/multiarch/wcsrchr.c
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+++ b/sysdeps/s390/wcsrchr.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-wcsrchr.h>
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+
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+#if HAVE_WCSRCHR_IFUNC
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# include <wchar.h>
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc2 (__wcsrchr, wcsrchr)
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+# if HAVE_WCSRCHR_C
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+extern __typeof (wcsrchr) WCSRCHR_C attribute_hidden;
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+# endif
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+
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+# if HAVE_WCSRCHR_Z13
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+extern __typeof (wcsrchr) WCSRCHR_Z13 attribute_hidden;
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+# endif
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-#else
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-# include <wcsmbs/wcsrchr.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+s390_libc_ifunc_expr (wcsrchr, wcsrchr,
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+ (HAVE_WCSRCHR_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? WCSRCHR_Z13
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+ : WCSRCHR_DEFAULT
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+ )
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+#endif
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