| 1 | /* Architecture-specific glibc-hwcaps subdirectories. x86 version. |
|---|---|
| 2 | Copyright (C) 2020-2024 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 | |
| 24 | const char _dl_hwcaps_subdirs[] = "x86-64-v4:x86-64-v3:x86-64-v2"; |
| 25 | enum { subdirs_count = 3 }; /* Number of components in _dl_hwcaps_subdirs. */ |
| 26 | |
| 27 | uint32_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: 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: 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: subdirs_count, active); |
| 49 | ++active; |
| 50 | |
| 51 | return _dl_hwcaps_subdirs_build_bitmask (subdirs: subdirs_count, active); |
| 52 | } |
| 53 |