1 /* Multiple versions of memcpy
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2010-2012 Free Software Foundation, Inc.
4 Contributed by Intel Corporation.
5 This file is part of the GNU C Library.
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.
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.
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/>. */
22 #include <shlib-compat.h>
23 #include <init-arch.h>
25 /* Define multiple versions only for the definition in lib and for
26 DSO. In static binaries we need memcpy before the initialization
28 #if defined SHARED && !defined NOT_IN_libc
31 .type __new_memcpy, @gnu_indirect_function
32 cmpl $0, KIND_OFFSET+__cpu_features(%rip)
34 call __init_cpu_features
35 1: leaq __memcpy_sse2(%rip), %rax
36 testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
38 leaq __memcpy_ssse3(%rip), %rax
39 testl $bit_Fast_Copy_Backward, __cpu_features+FEATURE_OFFSET+index_Fast_Copy_Backward(%rip)
41 leaq __memcpy_ssse3_back(%rip), %rax
46 # define ENTRY(name) \
47 .type __memcpy_sse2, @function; \
48 .globl __memcpy_sse2; \
49 .hidden __memcpy_sse2; \
51 __memcpy_sse2: cfi_startproc; \
55 cfi_endproc; .size __memcpy_sse2, .-__memcpy_sse2
58 # define ENTRY_CHK(name) \
59 .type __memcpy_chk_sse2, @function; \
60 .globl __memcpy_chk_sse2; \
62 __memcpy_chk_sse2: cfi_startproc; \
65 # define END_CHK(name) \
66 cfi_endproc; .size __memcpy_chk_sse2, .-__memcpy_chk_sse2
68 # undef libc_hidden_builtin_def
69 /* It doesn't make sense to send libc-internal memcpy calls through a PLT.
70 The speedup we get from using SSSE3 instruction is likely eaten away
71 by the indirect call in the PLT. */
72 # define libc_hidden_builtin_def(name) \
73 .globl __GI_memcpy; __GI_memcpy = __memcpy_sse2
75 versioned_symbol (libc, __new_memcpy, memcpy, GLIBC_2_14);
78 #include "../memcpy.S"