1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
/* Multiple versions of memcpy
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2010-2017 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. In static binaries we need memcpy before the initialization
happened. */
#if defined SHARED && IS_IN (libc)
.text
ENTRY(__new_memcpy)
.type __new_memcpy, @gnu_indirect_function
LOAD_RTLD_GLOBAL_RO_RDX
lea __memcpy_erms(%rip), %RAX_LP
HAS_ARCH_FEATURE (Prefer_ERMS)
jnz 2f
HAS_ARCH_FEATURE (AVX512F_Usable)
jz 1f
lea __memcpy_avx512_no_vzeroupper(%rip), %RAX_LP
HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
jnz 2f
lea __memcpy_avx512_unaligned_erms(%rip), %RAX_LP
HAS_CPU_FEATURE (ERMS)
jnz 2f
lea __memcpy_avx512_unaligned(%rip), %RAX_LP
ret
1: lea __memcpy_avx_unaligned(%rip), %RAX_LP
HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load)
jz L(Fast_Unaligned_Load)
HAS_CPU_FEATURE (ERMS)
jz 2f
lea __memcpy_avx_unaligned_erms(%rip), %RAX_LP
ret
L(Fast_Unaligned_Load):
lea __memcpy_sse2_unaligned(%rip), %RAX_LP
HAS_ARCH_FEATURE (Fast_Unaligned_Copy)
jz L(SSSE3)
HAS_CPU_FEATURE (ERMS)
jz 2f
lea __memcpy_sse2_unaligned_erms(%rip), %RAX_LP
ret
L(SSSE3):
HAS_CPU_FEATURE (SSSE3)
jz 2f
lea __memcpy_ssse3_back(%rip), %RAX_LP
HAS_ARCH_FEATURE (Fast_Copy_Backward)
jnz 2f
lea __memcpy_ssse3(%rip), %RAX_LP
2: ret
END(__new_memcpy)
# undef memcpy
# include <shlib-compat.h>
versioned_symbol (libc, __new_memcpy, memcpy, GLIBC_2_14);
#endif
|
