1 /* Multiple versions of memmove
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2016-2017 Free Software Foundation, Inc.
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, see
18 <http://www.gnu.org/licenses/>. */
21 #include <init-arch.h>
23 /* Define multiple versions only for the definition in lib and for
28 .type __libc_memmove, @gnu_indirect_function
29 LOAD_RTLD_GLOBAL_RO_RDX
30 lea __memmove_erms(%rip), %RAX_LP
31 HAS_ARCH_FEATURE (Prefer_ERMS)
33 HAS_ARCH_FEATURE (AVX512F_Usable)
35 lea __memmove_avx512_no_vzeroupper(%rip), %RAX_LP
36 HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
38 lea __memmove_avx512_unaligned_erms(%rip), %RAX_LP
39 HAS_CPU_FEATURE (ERMS)
41 lea __memmove_avx512_unaligned(%rip), %RAX_LP
43 1: lea __memmove_avx_unaligned(%rip), %RAX_LP
44 HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load)
45 jz L(Fast_Unaligned_Load)
46 HAS_CPU_FEATURE (ERMS)
48 lea __memmove_avx_unaligned_erms(%rip), %RAX_LP
50 L(Fast_Unaligned_Load):
51 lea __memmove_sse2_unaligned(%rip), %RAX_LP
52 HAS_ARCH_FEATURE (Fast_Unaligned_Copy)
54 HAS_CPU_FEATURE (ERMS)
56 lea __memmove_sse2_unaligned_erms(%rip), %RAX_LP
59 HAS_CPU_FEATURE (SSSE3)
61 lea __memmove_ssse3_back(%rip), %RAX_LP
62 HAS_ARCH_FEATURE (Fast_Copy_Backward)
64 lea __memmove_ssse3(%rip), %RAX_LP
70 # define MEMMOVE_SYMBOL(p,s) p##_sse2_##s
73 libc_hidden_ver (__memmove_sse2_unaligned, memmove)
74 libc_hidden_ver (__memcpy_sse2_unaligned, memcpy)
75 libc_hidden_ver (__mempcpy_sse2_unaligned, mempcpy)
76 libc_hidden_ver (__mempcpy_sse2_unaligned, __mempcpy)
78 # undef libc_hidden_builtin_def
79 /* It doesn't make sense to send libc-internal memmove calls through a PLT.
80 The speedup we get from using SSE2 instructions is likely eaten away
81 by the indirect call in the PLT. */
82 # define libc_hidden_builtin_def
84 strong_alias (__libc_memmove, memmove)
87 #if !defined SHARED || !IS_IN (libc)
88 weak_alias (__mempcpy, mempcpy)
91 #include "../memmove.S"
93 #if defined SHARED && IS_IN (libc)
94 # include <shlib-compat.h>
95 # if SHLIB_COMPAT (libc, GLIBC_2_2_5, GLIBC_2_14)
96 /* Use __memmove_sse2_unaligned to support overlapping addresses. */
97 compat_symbol (libc, __memmove_sse2_unaligned, memcpy, GLIBC_2_2_5);