1 /* Architecture-specific glibc-hwcaps subdirectories. x86 version. 2 Copyright (C) 2020-2021 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 _dl_hwcaps_subdirs_active(void)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