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/* Architecture-specific glibc-hwcaps subdirectories. x86 version.
Copyright (C) 2020-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <dl-hwcaps.h>
#include <cpu-features.h>
#include <ldsodefs.h>
#include <get-isa-level.h>
const char _dl_hwcaps_subdirs[] = "x86-64-v4:x86-64-v3:x86-64-v2";
enum { subdirs_count = 3 }; /* Number of components in _dl_hwcaps_subdirs. */
uint32_t
_dl_hwcaps_subdirs_active (void)
{
const struct cpu_features *cpu_features
= __x86_get_cpu_features (COMMON_CPUID_INDEX_MAX);
unsigned int isa_level = get_isa_level (cpu_features);
int active = 0;
/* Test in reverse preference order. */
/* x86-64-v2. */
if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V2))
return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
++active;
/* x86-64-v3. */
if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V3))
return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
++active;
/* x86-64-v4. */
if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V4))
return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
++active;
return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
}
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