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S390: Refactor wcscpy ifunc handling.

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The ifunc handling for wcscpy is adjusted in order to omit ifunc
if the minimum architecture level already supports newer CPUs by default.
Unfortunately the c ifunc variant can't be omitted at all as it is used
by the z13 ifunc variant as fallback if the pointers are not 4-byte aligned.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile
	(sysdep_routines): Remove wcscpy variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add wcscpy variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for wcscpy.
	* sysdeps/s390/multiarch/wcscpy-c.c: Move to ...
	* sysdeps/s390/wcscpy-c.c: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/wcscpy-vx.S: Move to ...
	* sysdeps/s390/wcscpy-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/wcscpy.c: Move to ...
	* sysdeps/s390/wcscpy.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-wcscpy.h: New file.
This commit is contained in:
Stefan Liebler
2018-12-18 13:57:18 +01:00
parent c7e7cd266e
commit 804f2e5c73
8 changed files with 116 additions and 19 deletions
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38
sysdeps/s390/wcscpy.c Normal file
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/* Multiple versions of wcscpy.
Copyright (C) 2015-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <ifunc-wcscpy.h>
#if HAVE_WCSCPY_IFUNC
# include <wchar.h>
# include <ifunc-resolve.h>
# if HAVE_WCSCPY_C
extern __typeof (wcscpy) WCSCPY_C attribute_hidden;
# endif
# if HAVE_WCSCPY_Z13
extern __typeof (wcscpy) WCSCPY_Z13 attribute_hidden;
# endif
s390_libc_ifunc_expr (wcscpy, wcscpy,
(HAVE_WCSCPY_Z13 && (hwcap & HWCAP_S390_VX))
? WCSCPY_Z13
: WCSCPY_DEFAULT
)
#endif