1/* Architecture-specific glibc-hwcaps subdirectories. x86 version.
2 Copyright (C) 2020-2023 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 <dl-hwcaps.h>
20#include <cpu-features.h>
21#include <ldsodefs.h>
22#include <get-isa-level.h>
23
24const char _dl_hwcaps_subdirs[] = "x86-64-v4:x86-64-v3:x86-64-v2";
25enum { subdirs_count = 3 }; /* Number of components in _dl_hwcaps_subdirs. */
26
27uint32_t
28_dl_hwcaps_subdirs_active (void)
29{
30 const struct cpu_features *cpu_features = __get_cpu_features ();
31 unsigned int isa_level = get_isa_level (cpu_features);
32 int active = 0;
33
34 /* Test in reverse preference order. */
35
36 /* x86-64-v2. */
37 if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V2))
38 return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
39 ++active;
40
41 /* x86-64-v3. */
42 if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V3))
43 return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
44 ++active;
45
46 /* x86-64-v4. */
47 if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V4))
48 return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
49 ++active;
50
51 return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
52}
53