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c7d3890ff5
This version uses general register based memory store instead of
vector register based, for the former is faster than the latter
in emag.
The fact that DC ZVA size in emag is 64-byte, is used by IFUNC
dispatch to select this memset, so that cost of runtime-check on
DC ZVA size can be saved.
* sysdeps/aarch64/multiarch/Makefile (sysdep_routines):
Add memset_emag.
* sysdeps/aarch64/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Add __memset_emag to memset ifunc.
* sysdeps/aarch64/multiarch/memset.c (libc_ifunc):
Add IS_EMAG check for ifunc dispatch.
* sysdeps/aarch64/multiarch/memset_base64.S: New file.
* sysdeps/aarch64/multiarch/memset_emag.S: New file.
45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
/* Multiple versions of memset. AARCH64 version.
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Copyright (C) 2017-2019 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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/* Define multiple versions only for the definition in libc. */
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#if IS_IN (libc)
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/* Redefine memset so that the compiler won't complain about the type
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mismatch with the IFUNC selector in strong_alias, below. */
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# undef memset
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# define memset __redirect_memset
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# include <string.h>
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# include <init-arch.h>
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extern __typeof (__redirect_memset) __libc_memset;
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extern __typeof (__redirect_memset) __memset_falkor attribute_hidden;
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extern __typeof (__redirect_memset) __memset_emag attribute_hidden;
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extern __typeof (__redirect_memset) __memset_generic attribute_hidden;
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libc_ifunc (__libc_memset,
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((IS_FALKOR (midr) || IS_PHECDA (midr)) && zva_size == 64
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? __memset_falkor
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: (IS_EMAG (midr) && zva_size == 64
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? __memset_emag
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: __memset_generic)));
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# undef memset
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strong_alias (__libc_memset, memset);
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#endif
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