1/* Multiple versions of memcpy
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2010-2017 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 memcpy before the initialization
26 happened. */
27#if defined SHARED && IS_IN (libc)
28 .text
29ENTRY(__new_memcpy)
30 .type __new_memcpy, @gnu_indirect_function
31 LOAD_RTLD_GLOBAL_RO_RDX
32 lea __memcpy_erms(%rip), %RAX_LP
33 HAS_ARCH_FEATURE (Prefer_ERMS)
34 jnz 2f
35 HAS_ARCH_FEATURE (AVX512F_Usable)
36 jz 1f
37 lea __memcpy_avx512_no_vzeroupper(%rip), %RAX_LP
38 HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
39 jnz 2f
40 lea __memcpy_avx512_unaligned_erms(%rip), %RAX_LP
41 HAS_CPU_FEATURE (ERMS)
42 jnz 2f
43 lea __memcpy_avx512_unaligned(%rip), %RAX_LP
44 ret
451: lea __memcpy_avx_unaligned(%rip), %RAX_LP
46 HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load)
47 jz L(Fast_Unaligned_Load)
48 HAS_CPU_FEATURE (ERMS)
49 jz 2f
50 lea __memcpy_avx_unaligned_erms(%rip), %RAX_LP
51 ret
52L(Fast_Unaligned_Load):
53 lea __memcpy_sse2_unaligned(%rip), %RAX_LP
54 HAS_ARCH_FEATURE (Fast_Unaligned_Copy)
55 jz L(SSSE3)
56 HAS_CPU_FEATURE (ERMS)
57 jz 2f
58 lea __memcpy_sse2_unaligned_erms(%rip), %RAX_LP
59 ret
60L(SSSE3):
61 HAS_CPU_FEATURE (SSSE3)
62 jz 2f
63 lea __memcpy_ssse3_back(%rip), %RAX_LP
64 HAS_ARCH_FEATURE (Fast_Copy_Backward)
65 jnz 2f
66 lea __memcpy_ssse3(%rip), %RAX_LP
672: ret
68END(__new_memcpy)
69
70# undef memcpy
71# include <shlib-compat.h>
72versioned_symbol (libc, __new_memcpy, memcpy, GLIBC_2_14);
73#endif
74