1 /* Multiple versions of mempcpy
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2010-2013 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 <init-arch.h>
24 /* Define multiple versions only for the definition in lib and for
25 DSO. In static binaries we need mempcpy before the initialization
27 #if defined SHARED && !defined NOT_IN_libc
29 .type __mempcpy, @gnu_indirect_function
30 cmpl $0, KIND_OFFSET+__cpu_features(%rip)
32 call __init_cpu_features
33 1: leaq __mempcpy_sse2(%rip), %rax
34 testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
36 leaq __mempcpy_ssse3(%rip), %rax
37 testl $bit_Fast_Copy_Backward, __cpu_features+FEATURE_OFFSET+index_Fast_Copy_Backward(%rip)
39 leaq __mempcpy_ssse3_back(%rip), %rax
44 # define ENTRY(name) \
45 .type __mempcpy_sse2, @function; \
47 .globl __mempcpy_sse2; \
48 .hidden __mempcpy_sse2; \
49 __mempcpy_sse2: cfi_startproc; \
53 cfi_endproc; .size __mempcpy_sse2, .-__mempcpy_sse2
56 # define ENTRY_CHK(name) \
57 .type __mempcpy_chk_sse2, @function; \
58 .globl __mempcpy_chk_sse2; \
60 __mempcpy_chk_sse2: cfi_startproc; \
63 # define END_CHK(name) \
64 cfi_endproc; .size __mempcpy_chk_sse2, .-__mempcpy_chk_sse2
66 # undef libc_hidden_def
67 # undef libc_hidden_builtin_def
68 /* It doesn't make sense to send libc-internal mempcpy calls through a PLT.
69 The speedup we get from using SSSE3 instruction is likely eaten away
70 by the indirect call in the PLT. */
71 # define libc_hidden_def(name) \
72 .globl __GI_mempcpy; __GI_mempcpy = __mempcpy_sse2
73 # define libc_hidden_builtin_def(name) \
74 .globl __GI___mempcpy; __GI___mempcpy = __mempcpy_sse2
77 #include "../mempcpy.S"