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glibc/sysdeps/x86_64/multiarch/memcpy_chk.S
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/* Multiple versions of __memcpy_chk | |
All versions must be listed in ifunc-impl-list.c. | |
Copyright (C) 2010-2016 Free Software Foundation, Inc. | |
Contributed by Intel Corporation. | |
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 <init-arch.h> | |
/* Define multiple versions only for the definition in lib and for | |
DSO. There are no multiarch memcpy functions for static binaries. | |
*/ | |
#if IS_IN (libc) | |
# ifdef SHARED | |
.text | |
ENTRY(__memcpy_chk) | |
.type __memcpy_chk, @gnu_indirect_function | |
LOAD_RTLD_GLOBAL_RO_RDX | |
#ifdef HAVE_AVX512_ASM_SUPPORT | |
HAS_ARCH_FEATURE (AVX512F_Usable) | |
jz 1f | |
HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER) | |
jz 1f | |
leaq __memcpy_chk_avx512_no_vzeroupper(%rip), %rax | |
ret | |
#endif | |
1: leaq __memcpy_chk_sse2(%rip), %rax | |
HAS_CPU_FEATURE (SSSE3) | |
jz 2f | |
leaq __memcpy_chk_ssse3(%rip), %rax | |
HAS_ARCH_FEATURE (Fast_Copy_Backward) | |
jz 2f | |
leaq __memcpy_chk_ssse3_back(%rip), %rax | |
HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load) | |
jz 2f | |
leaq __memcpy_chk_avx_unaligned(%rip), %rax | |
2: ret | |
END(__memcpy_chk) | |
# else | |
# include "../memcpy_chk.S" | |
# endif | |
#endif |