1/* Multiple versions of memcmp
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2010-2016 Free Software Foundation, Inc.
4 Contributed by Intel Corporation.
5 This file is part of the GNU C Library.
6
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.
11
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.
16
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/>. */
20
21#include <sysdep.h>
22#include <init-arch.h>
23
24/* Define multiple versions only for the definition in libc. */
25#if IS_IN (libc)
26 .text
27ENTRY(memcmp)
28 .type memcmp, @gnu_indirect_function
29 LOAD_RTLD_GLOBAL_RO_RDX
30 HAS_CPU_FEATURE (SSSE3)
31 jnz 2f
32 leaq __memcmp_sse2(%rip), %rax
33 ret
34
352: HAS_CPU_FEATURE (SSE4_1)
36 jz 3f
37 leaq __memcmp_sse4_1(%rip), %rax
38 ret
39
403: leaq __memcmp_ssse3(%rip), %rax
41 ret
42
43END(memcmp)
44
45# undef ENTRY
46# define ENTRY(name) \
47 .type __memcmp_sse2, @function; \
48 .p2align 4; \
49 .globl __memcmp_sse2; \
50 .hidden __memcmp_sse2; \
51 __memcmp_sse2: cfi_startproc; \
52 CALL_MCOUNT
53# undef END
54# define END(name) \
55 cfi_endproc; .size __memcmp_sse2, .-__memcmp_sse2
56
57# ifdef SHARED
58# undef libc_hidden_builtin_def
59/* IFUNC doesn't work with the hidden functions in shared library since
60 they will be called without setting up EBX needed for PLT which is
61 used by IFUNC. */
62# define libc_hidden_builtin_def(name) \
63 .globl __GI_memcmp; __GI_memcmp = __memcmp_sse2
64# endif
65#endif
66
67#include "../memcmp.S"
68