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
74
75
76
77
78
|
/* Multiple versions of mempcpy
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2010-2015 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 mempcpy before the initialization
happened. */
#if defined SHARED && IS_IN (libc)
ENTRY(__mempcpy)
.type __mempcpy, @gnu_indirect_function
LOAD_RTLD_GLOBAL_RO_RDX
leaq __mempcpy_sse2(%rip), %rax
HAS_CPU_FEATURE (SSSE3)
jz 2f
leaq __mempcpy_ssse3(%rip), %rax
HAS_ARCH_FEATURE (Fast_Copy_Backward)
jz 2f
leaq __mempcpy_ssse3_back(%rip), %rax
HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load)
jz 2f
leaq __mempcpy_avx_unaligned(%rip), %rax
2: ret
END(__mempcpy)
# undef ENTRY
# define ENTRY(name) \
.type __mempcpy_sse2, @function; \
.p2align 4; \
.globl __mempcpy_sse2; \
.hidden __mempcpy_sse2; \
__mempcpy_sse2: cfi_startproc; \
CALL_MCOUNT
# undef END
# define END(name) \
cfi_endproc; .size __mempcpy_sse2, .-__mempcpy_sse2
# undef ENTRY_CHK
# define ENTRY_CHK(name) \
.type __mempcpy_chk_sse2, @function; \
.globl __mempcpy_chk_sse2; \
.p2align 4; \
__mempcpy_chk_sse2: cfi_startproc; \
CALL_MCOUNT
# undef END_CHK
# define END_CHK(name) \
cfi_endproc; .size __mempcpy_chk_sse2, .-__mempcpy_chk_sse2
# undef libc_hidden_def
# undef libc_hidden_builtin_def
/* It doesn't make sense to send libc-internal mempcpy calls through a PLT.
The speedup we get from using SSSE3 instruction is likely eaten away
by the indirect call in the PLT. */
# define libc_hidden_def(name) \
.globl __GI_mempcpy; __GI_mempcpy = __mempcpy_sse2
# define libc_hidden_builtin_def(name) \
.globl __GI___mempcpy; __GI___mempcpy = __mempcpy_sse2
#endif
#include "../mempcpy.S"
|
