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