1/* Multiple versions of mempcpy
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2010-2016 Free Software Foundation, Inc.
4 Contributed by Intel Corporation.
5 This file is part of the GNU C Library.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
20
21#include <sysdep.h>
22#include <init-arch.h>
23
24/* Define multiple versions only for the definition in lib and for
25 DSO. In static binaries we need mempcpy before the initialization
26 happened. */
27#if defined SHARED && IS_IN (libc)
28ENTRY(__mempcpy)
29 .type __mempcpy, @gnu_indirect_function
30 LOAD_RTLD_GLOBAL_RO_RDX
31#ifdef HAVE_AVX512_ASM_SUPPORT
32 HAS_ARCH_FEATURE (AVX512F_Usable)
33 jz 1f
34 HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
35 jz 1f
36 leaq __mempcpy_avx512_no_vzeroupper(%rip), %rax
37 ret
38#endif
391: leaq __mempcpy_sse2(%rip), %rax
40 HAS_CPU_FEATURE (SSSE3)
41 jz 2f
42 leaq __mempcpy_ssse3(%rip), %rax
43 HAS_ARCH_FEATURE (Fast_Copy_Backward)
44 jz 2f
45 leaq __mempcpy_ssse3_back(%rip), %rax
46 HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load)
47 jz 2f
48 leaq __mempcpy_avx_unaligned(%rip), %rax
492: ret
50END(__mempcpy)
51
52# undef ENTRY
53# define ENTRY(name) \
54 .type __mempcpy_sse2, @function; \
55 .p2align 4; \
56 .globl __mempcpy_sse2; \
57 .hidden __mempcpy_sse2; \
58 __mempcpy_sse2: cfi_startproc; \
59 CALL_MCOUNT
60# undef END
61# define END(name) \
62 cfi_endproc; .size __mempcpy_sse2, .-__mempcpy_sse2
63
64# undef ENTRY_CHK
65# define ENTRY_CHK(name) \
66 .type __mempcpy_chk_sse2, @function; \
67 .globl __mempcpy_chk_sse2; \
68 .p2align 4; \
69 __mempcpy_chk_sse2: cfi_startproc; \
70 CALL_MCOUNT
71# undef END_CHK
72# define END_CHK(name) \
73 cfi_endproc; .size __mempcpy_chk_sse2, .-__mempcpy_chk_sse2
74
75# undef libc_hidden_def
76# undef libc_hidden_builtin_def
77/* It doesn't make sense to send libc-internal mempcpy calls through a PLT.
78 The speedup we get from using SSSE3 instruction is likely eaten away
79 by the indirect call in the PLT. */
80# define libc_hidden_def(name) \
81 .globl __GI_mempcpy; __GI_mempcpy = __mempcpy_sse2
82# define libc_hidden_builtin_def(name) \
83 .globl __GI___mempcpy; __GI___mempcpy = __mempcpy_sse2
84#endif
85
86#include "../mempcpy.S"
87