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cdd927d98c
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.
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/* Multiple versions of memmove.
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Copyright (C) 2016-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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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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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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#include <ifunc-memcpy.h>
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#if HAVE_MEMMOVE_IFUNC
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/* If we don't use ifunc, an alias is defined for memmove
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in sysdeps/s390/memmove-c.c or sysdeps/s390/memcpy.S
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depending on the used default implementation. */
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# undef memmove
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# define memmove __redirect_memmove
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# include <string.h>
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# include <ifunc-resolve.h>
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# undef memmove
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# if HAVE_MEMMOVE_C
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extern __typeof (__redirect_memmove) MEMMOVE_C attribute_hidden;
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# endif
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# if HAVE_MEMMOVE_Z13
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extern __typeof (__redirect_memmove) MEMMOVE_Z13 attribute_hidden;
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# endif
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s390_libc_ifunc_expr (__redirect_memmove, memmove,
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(HAVE_MEMMOVE_Z13 && (hwcap & HWCAP_S390_VX))
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? MEMMOVE_Z13
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: MEMMOVE_DEFAULT
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)
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#endif
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