1 /* Enumerate available IFUNC implementations of a function. ARM version.
2 Copyright (C) 2013-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <stdbool.h>
20 #include <string.h>
21 #include <ldsodefs.h>
22 #include <sysdep.h>
23 #include <ifunc-impl-list.h>
24
25 /* Fill ARRAY of MAX elements with IFUNC implementations for function
26 NAME and return the number of valid entries. */
27
28 size_t
__libc_ifunc_impl_list(const char * name,struct libc_ifunc_impl * array,size_t max)29 __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
30 size_t max)
31 {
32 size_t i = max;
33
34 bool use_neon = true;
35 #ifdef __ARM_NEON__
36 # define __memcpy_neon memcpy
37 # define __memchr_neon memchr
38 #else
39 use_neon = (GLRO(dl_hwcap) & HWCAP_ARM_NEON) != 0;
40 #endif
41
42 #ifndef __ARM_NEON__
43 bool use_vfp = true;
44 # ifdef __SOFTFP__
45 use_vfp = (GLRO(dl_hwcap) & HWCAP_ARM_VFP) != 0;
46 # endif
47 #endif
48
49 IFUNC_IMPL (i, name, memcpy,
50 IFUNC_IMPL_ADD (array, i, memcpy, use_neon, __memcpy_neon)
51 #ifndef __ARM_NEON__
52 IFUNC_IMPL_ADD (array, i, memcpy, use_vfp, __memcpy_vfp)
53 #endif
54 IFUNC_IMPL_ADD (array, i, memcpy, 1, __memcpy_arm));
55
56 IFUNC_IMPL (i, name, memchr,
57 IFUNC_IMPL_ADD (array, i, memchr, use_neon, __memchr_neon)
58 IFUNC_IMPL_ADD (array, i, memchr, 1, __memchr_noneon));
59
60 return 0;
61 }
62