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commit 196655ba54ebdcdcc0468bcb6e136757b013d350
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Author: Stefan Liebler <stli@linux.ibm.com>
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Date: Tue Dec 18 13:57:16 2018 +0100
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S390: Refactor memccpy ifunc handling.
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The ifunc handling for memccpy 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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ChangeLog:
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* sysdeps/s390/multiarch/Makefile
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(sysdep_routines): Remove memccpy variants.
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* sysdeps/s390/Makefile (sysdep_routines): Add memccpy variants.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Refactor ifunc handling for memccpy.
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* sysdeps/s390/multiarch/memccpy-c.c: Move to ...
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* sysdeps/s390/memccpy-c.c: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/memccpy-vx.S: Move to ...
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* sysdeps/s390/memccpy-vx.S: ... here and adjust ifunc handling.
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* sysdeps/s390/multiarch/memccpy.c: Move to ...
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* sysdeps/s390/memccpy.c: ... here and adjust ifunc handling.
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* sysdeps/s390/ifunc-memccpy.h: New file.
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diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile
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index 9b38b461b34176b0..239426dbc1ce9d09 100644
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--- a/sysdeps/s390/Makefile
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+++ b/sysdeps/s390/Makefile
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@@ -54,5 +54,6 @@ sysdep_routines += bzero memset memset-z900 \
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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 memchr-z900 \
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- rawmemchr rawmemchr-vx rawmemchr-c
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+ rawmemchr rawmemchr-vx rawmemchr-c \
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+ memccpy memccpy-vx memccpy-c
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endif
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diff --git a/sysdeps/s390/ifunc-memccpy.h b/sysdeps/s390/ifunc-memccpy.h
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new file mode 100644
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index 0000000000000000..8f7a1d0f9fffe106
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--- /dev/null
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+++ b/sysdeps/s390/ifunc-memccpy.h
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@@ -0,0 +1,52 @@
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+/* memccpy 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_MEMCCPY_IFUNC 1
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+#else
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+# define HAVE_MEMCCPY_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_MEMCCPY_IFUNC_AND_VX_SUPPORT HAVE_MEMCCPY_IFUNC
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+#else
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+# define HAVE_MEMCCPY_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 MEMCCPY_DEFAULT MEMCCPY_Z13
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+# define HAVE_MEMCCPY_C 0
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+# define HAVE_MEMCCPY_Z13 1
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+#else
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+# define MEMCCPY_DEFAULT MEMCCPY_C
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+# define HAVE_MEMCCPY_C 1
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+# define HAVE_MEMCCPY_Z13 HAVE_MEMCCPY_IFUNC_AND_VX_SUPPORT
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+#endif
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+
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+#if HAVE_MEMCCPY_C
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+# define MEMCCPY_C __memccpy_c
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+#else
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+# define MEMCCPY_C NULL
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+#endif
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+
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+#if HAVE_MEMCCPY_Z13
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+# define MEMCCPY_Z13 __memccpy_vx
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+#else
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+# define MEMCCPY_Z13 NULL
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+#endif
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diff --git a/sysdeps/s390/multiarch/memccpy-c.c b/sysdeps/s390/memccpy-c.c
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similarity index 85%
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rename from sysdeps/s390/multiarch/memccpy-c.c
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rename to sysdeps/s390/memccpy-c.c
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index 1f4c5481991fcb70..2b2f81eb9cfe9369 100644
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--- a/sysdeps/s390/multiarch/memccpy-c.c
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+++ b/sysdeps/s390/memccpy-c.c
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@@ -16,10 +16,14 @@
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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 MEMCCPY __memccpy_c
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+#include <ifunc-memccpy.h>
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+
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+#if HAVE_MEMCCPY_C
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+# if HAVE_MEMCCPY_IFUNC
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+# define MEMCCPY MEMCCPY_C
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+# undef weak_alias
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+# define weak_alias(a, b)
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+#endif
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-# include <string.h>
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-extern __typeof (__memccpy) __memccpy_c;
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# include <string/memccpy.c>
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#endif
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diff --git a/sysdeps/s390/multiarch/memccpy-vx.S b/sysdeps/s390/memccpy-vx.S
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similarity index 95%
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rename from sysdeps/s390/multiarch/memccpy-vx.S
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rename to sysdeps/s390/memccpy-vx.S
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index 150aa0e4a48ca181..44f7bc582410ba22 100644
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--- a/sysdeps/s390/multiarch/memccpy-vx.S
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+++ b/sysdeps/s390/memccpy-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-memccpy.h>
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+
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+#if HAVE_MEMCCPY_Z13
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# include "sysdep.h"
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# include "asm-syntax.h"
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@@ -42,7 +44,7 @@
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-v19=part #2 of s
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-v31=save area for r6
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*/
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-ENTRY(__memccpy_vx)
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+ENTRY(MEMCCPY_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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@@ -152,5 +154,11 @@ ENTRY(__memccpy_vx)
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vlgvg %r7,%v31,1
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lghi %r2,0 /* Return null. */
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br %r14
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-END(__memccpy_vx)
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-#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
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+END(MEMCCPY_Z13)
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+
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+# if ! HAVE_MEMCCPY_IFUNC
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+strong_alias (MEMCCPY_Z13, __memccpy)
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+weak_alias (__memccpy, memccpy)
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+# endif
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+
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+#endif /* HAVE_MEMCCPY_Z13 */
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diff --git a/sysdeps/s390/multiarch/memccpy.c b/sysdeps/s390/memccpy.c
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similarity index 68%
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rename from sysdeps/s390/multiarch/memccpy.c
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rename to sysdeps/s390/memccpy.c
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index 30aae82321048b7d..bcfeb31e86c56115 100644
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--- a/sysdeps/s390/multiarch/memccpy.c
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+++ b/sysdeps/s390/memccpy.c
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@@ -16,13 +16,24 @@
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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-memccpy.h>
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+
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+#if HAVE_MEMCCPY_IFUNC
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# include <string.h>
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# include <ifunc-resolve.h>
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-s390_vx_libc_ifunc (__memccpy)
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-weak_alias (__memccpy, memccpy)
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+# if HAVE_MEMCCPY_C
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+extern __typeof (__memccpy) MEMCCPY_C attribute_hidden;
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+# endif
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-#else
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-# include <string/memccpy.c>
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-#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)) */
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+# if HAVE_MEMCCPY_Z13
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+extern __typeof (__memccpy) MEMCCPY_Z13 attribute_hidden;
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+# endif
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+
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+s390_libc_ifunc_expr (__memccpy, __memccpy,
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+ (HAVE_MEMCCPY_Z13 && (hwcap & HWCAP_S390_VX))
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+ ? MEMCCPY_Z13
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+ : MEMCCPY_DEFAULT
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+ )
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+weak_alias (__memccpy, memccpy)
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+#endif /* HAVE_MEMCCPY_IFUNC */
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diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
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index ac6cfcf9c7dbbc3a..d5a32fc309ba4b3c 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 ($(subdir),string)
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-sysdep_routines += memccpy memccpy-vx memccpy-c \
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- memrchr memrchr-vx memrchr-c
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+sysdep_routines += memrchr memrchr-vx memrchr-c
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endif
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ifeq ($(subdir),wcsmbs)
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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 bf3b40e111a6bd31..b8917747f0f23cd9 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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@@ -44,6 +44,7 @@
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#include <ifunc-strcspn.h>
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#include <ifunc-memchr.h>
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#include <ifunc-rawmemchr.h>
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+#include <ifunc-memccpy.h>
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/* Maximum number of IFUNC implementations. */
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#define MAX_IFUNC 3
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@@ -398,6 +399,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_RAWMEMCHR_IFUNC */
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+#if HAVE_MEMCCPY_IFUNC
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+ IFUNC_IMPL (i, name, memccpy,
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+# if HAVE_MEMCCPY_Z13
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+ IFUNC_IMPL_ADD (array, i, memccpy,
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+ dl_hwcap & HWCAP_S390_VX, MEMCCPY_Z13)
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+# endif
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+# if HAVE_MEMCCPY_C
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+ IFUNC_IMPL_ADD (array, i, memccpy, 1, MEMCCPY_C)
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+# endif
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+ )
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+#endif /* HAVE_MEMCCPY_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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@@ -440,8 +453,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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IFUNC_VX_IMPL (wmemchr);
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- IFUNC_VX_IMPL (memccpy);
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-
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IFUNC_VX_IMPL (wmemset);
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IFUNC_VX_IMPL (wmemcmp);
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