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/* Multiple versions of memset
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2014-2017 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 <sysdep.h>
#include <shlib-compat.h>
#include <init-arch.h>
/* Define multiple versions only for the definition in lib. */
#if IS_IN (libc)
ENTRY(memset)
.type memset, @gnu_indirect_function
LOAD_RTLD_GLOBAL_RO_RDX
lea __memset_erms(%rip), %RAX_LP
HAS_ARCH_FEATURE (Prefer_ERMS)
jnz 2f
lea __memset_sse2_unaligned_erms(%rip), %RAX_LP
HAS_CPU_FEATURE (ERMS)
jnz 1f
lea __memset_sse2_unaligned(%rip), %RAX_LP
1:
HAS_ARCH_FEATURE (AVX2_Usable)
jz 2f
lea __memset_avx2_unaligned_erms(%rip), %RAX_LP
HAS_CPU_FEATURE (ERMS)
jnz L(AVX512F)
lea __memset_avx2_unaligned(%rip), %RAX_LP
L(AVX512F):
HAS_ARCH_FEATURE (Prefer_No_AVX512)
jnz 2f
HAS_ARCH_FEATURE (AVX512F_Usable)
jz 2f
lea __memset_avx512_no_vzeroupper(%rip), %RAX_LP
HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
jnz 2f
lea __memset_avx512_unaligned_erms(%rip), %RAX_LP
HAS_CPU_FEATURE (ERMS)
jnz 2f
lea __memset_avx512_unaligned(%rip), %RAX_LP
2: ret
END(memset)
#endif
#if IS_IN (libc)
# define MEMSET_SYMBOL(p,s) p##_sse2_##s
# ifdef SHARED
# undef libc_hidden_builtin_def
/* It doesn't make sense to send libc-internal memset calls through a PLT.
The speedup we get from using SSE2 instructions is likely eaten away
by the indirect call in the PLT. */
# define libc_hidden_builtin_def(name) \
.globl __GI_memset; __GI_memset = __memset_sse2_unaligned
# endif
# undef strong_alias
# define strong_alias(original, alias)
#endif
#include "../memset.S"
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