1/* Multiple versions of memcpy
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 <shlib-compat.h>
23#include <init-arch.h>
24
25/* Define multiple versions only for the definition in lib and for
26 DSO. In static binaries we need memcpy before the initialization
27 happened. */
28#if defined SHARED && IS_IN (libc)
29 .text
30ENTRY(__new_memcpy)
31 .type __new_memcpy, @gnu_indirect_function
32 LOAD_RTLD_GLOBAL_RO_RDX
33#ifdef HAVE_AVX512_ASM_SUPPORT
34 HAS_ARCH_FEATURE (AVX512F_Usable)
35 jz 1f
36 HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
37 jz 1f
38 leaq __memcpy_avx512_no_vzeroupper(%rip), %rax
39 ret
40#endif
411: leaq __memcpy_avx_unaligned(%rip), %rax
42 HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load)
43 jz 2f
44 ret
452: leaq __memcpy_sse2(%rip), %rax
46 HAS_ARCH_FEATURE (Slow_BSF)
47 jnz 3f
48 leaq __memcpy_sse2_unaligned(%rip), %rax
49 ret
503: HAS_CPU_FEATURE (SSSE3)
51 jz 4f
52 leaq __memcpy_ssse3(%rip), %rax
534: ret
54END(__new_memcpy)
55
56# undef ENTRY
57# define ENTRY(name) \
58 .type __memcpy_sse2, @function; \
59 .globl __memcpy_sse2; \
60 .hidden __memcpy_sse2; \
61 .p2align 4; \
62 __memcpy_sse2: cfi_startproc; \
63 CALL_MCOUNT
64# undef END
65# define END(name) \
66 cfi_endproc; .size __memcpy_sse2, .-__memcpy_sse2
67
68# undef ENTRY_CHK
69# define ENTRY_CHK(name) \
70 .type __memcpy_chk_sse2, @function; \
71 .globl __memcpy_chk_sse2; \
72 .p2align 4; \
73 __memcpy_chk_sse2: cfi_startproc; \
74 CALL_MCOUNT
75# undef END_CHK
76# define END_CHK(name) \
77 cfi_endproc; .size __memcpy_chk_sse2, .-__memcpy_chk_sse2
78
79# undef libc_hidden_builtin_def
80/* It doesn't make sense to send libc-internal memcpy calls through a PLT.
81 The speedup we get from using SSSE3 instruction is likely eaten away
82 by the indirect call in the PLT. */
83# define libc_hidden_builtin_def(name) \
84 .globl __GI_memcpy; __GI_memcpy = __memcpy_sse2
85
86versioned_symbol (libc, __new_memcpy, memcpy, GLIBC_2_14);
87#endif
88
89#include "../memcpy.S"
90