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S390: Add z13 memmove ifunc variant.

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This patch introduces a z13 specific ifunc variant for memmove.
As the common code implementation, it checks if we can copy from
the beginning to the end - with z196 memcpy implementation - or
if we have to copy from the end to the beginning.
The latter case is done by using vector load/store instructions.

If vector instructions are not available, the common-code is
used as fallback.  Therefore it is implemented in memmove-c with
a different name.
Furthermore the ifunc logic decides if we need the common-code
implementation at all.  If vector instructions are supported
due to the minimum architecture level set we can skip the
common-code ifunc variant.

ChangeLog:

	* sysdeps/s390/Makefile (sysdep_routines): Add memmove-c.
	* sysdeps/s390/ifunc-memcpy.h (HAVE_MEMMOVE_IFUNC,
	HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT, MEMMOVE_DEFAULT,
	HAVE_MEMMOVE_C, MEMMOVE_C,  HAVE_MEMMOVE_Z13, MEMMOVE_Z13):
	New defines.
	* sysdeps/s390/memcpy-z900.S: Add z13 memmove implementation.
	* sysdeps/s390/memmove-c.c: New file.
	* sysdeps/s390/memmove.c: Likewise.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc variants for memmove.
This commit is contained in:
Stefan Liebler
2018-12-18 13:57:08 +01:00
parent 2ee1bc57ab
commit cdd927d98c
7 changed files with 230 additions and 1 deletions
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37
sysdeps/s390/memmove-c.c Normal file
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/* Fallback C version of memmove.
Copyright (C) 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-memcpy.h>
#if HAVE_MEMMOVE_C
# if HAVE_MEMMOVE_IFUNC
/* If we use ifunc, then the memmove symbol is defined
in sysdeps/s390/memmove.c and we use a different name here.
Otherwise, we have to define memmove here or in
sysdeps/s390/memcpy.S depending on the used default implementation. */
# define MEMMOVE MEMMOVE_C
# if defined SHARED && IS_IN (libc)
/* Define the internal symbol. */
# undef libc_hidden_builtin_def
# define libc_hidden_builtin_def(name) \
__hidden_ver1 (__memmove_c, __GI_memmove, __memmove_c);
# endif
# endif
# include <string/memmove.c>
#endif