1 /* Multiple versions of memcpy
2 Copyright (C) 2010 Free Software Foundation, Inc.
3 Contributed by Intel Corporation.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 #include <init-arch.h>
24 /* Define multiple versions only for the definition in lib and for
25 DSO. In static binaries we need memcpy before the initialization
27 #if defined SHARED && !defined NOT_IN_libc
30 .type memcpy, @gnu_indirect_function
31 cmpl $0, KIND_OFFSET+__cpu_features(%rip)
33 call __init_cpu_features
34 1: leaq __memcpy_sse2(%rip), %rax
35 testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
37 leaq __memcpy_ssse3(%rip), %rax
38 testl $bit_Fast_Copy_Backward, __cpu_features+FEATURE_OFFSET+index_Fast_Copy_Backward(%rip)
40 leaq __memcpy_ssse3_back(%rip), %rax
45 # define ENTRY(name) \
46 .type __memcpy_sse2, @function; \
48 __memcpy_sse2: cfi_startproc; \
52 cfi_endproc; .size __memcpy_sse2, .-__memcpy_sse2
55 # define ENTRY_CHK(name) \
56 .type __memcpy_chk_sse2, @function; \
57 .globl __memcpy_chk_sse2; \
59 __memcpy_chk_sse2: cfi_startproc; \
62 # define END_CHK(name) \
63 cfi_endproc; .size __memcpy_chk_sse2, .-__memcpy_chk_sse2
65 # undef libc_hidden_builtin_def
66 /* It doesn't make sense to send libc-internal memcpy calls through a PLT.
67 The speedup we get from using SSSE3 instruction is likely eaten away
68 by the indirect call in the PLT. */
69 # define libc_hidden_builtin_def(name) \
70 .globl __GI_memcpy; __GI_memcpy = __memcpy_sse2
73 #include "../memcpy.S"