1 /* Multiple versions of memcpy
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2010-2015 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 && IS_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_avx_unaligned(%rip), %rax
36 testl $bit_AVX_Usable, __cpu_features+FEATURE_OFFSET+index_AVX_Usable(%rip)
39 1: leaq __memcpy_sse2(%rip), %rax
40 testl $bit_Slow_BSF, __cpu_features+FEATURE_OFFSET+index_Slow_BSF(%rip)
42 leaq __memcpy_sse2_unaligned(%rip), %rax
44 2: testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
46 leaq __memcpy_ssse3(%rip), %rax
51 # define ENTRY(name) \
52 .type __memcpy_sse2, @function; \
53 .globl __memcpy_sse2; \
54 .hidden __memcpy_sse2; \
56 __memcpy_sse2: cfi_startproc; \
60 cfi_endproc; .size __memcpy_sse2, .-__memcpy_sse2
63 # define ENTRY_CHK(name) \
64 .type __memcpy_chk_sse2, @function; \
65 .globl __memcpy_chk_sse2; \
67 __memcpy_chk_sse2: cfi_startproc; \
70 # define END_CHK(name) \
71 cfi_endproc; .size __memcpy_chk_sse2, .-__memcpy_chk_sse2
73 # undef libc_hidden_builtin_def
74 /* It doesn't make sense to send libc-internal memcpy calls through a PLT.
75 The speedup we get from using SSSE3 instruction is likely eaten away
76 by the indirect call in the PLT. */
77 # define libc_hidden_builtin_def(name) \
78 .globl __GI_memcpy; __GI_memcpy = __memcpy_sse2
80 versioned_symbol (libc, __new_memcpy, memcpy, GLIBC_2_14);
83 #include "../memcpy.S"