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 |
27 | ENTRY(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 | |
35 | 2: HAS_CPU_FEATURE (SSE4_1) |
36 | jz 3f |
37 | leaq __memcmp_sse4_1(%rip), %rax |
38 | ret |
39 | |
40 | 3: leaq __memcmp_ssse3(%rip), %rax |
41 | ret |
42 | |
43 | END(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 | |