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9a1d2d4555
We use a callback function into libc.so to get access to the data structure with the information and have special versions of the test macros which automatically use this function.
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/* This file is part of the GNU C Library.
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Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sys/param.h>
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enum
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{
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COMMON_CPUID_INDEX_1 = 0,
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/* Keep the following line at the end. */
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COMMON_CPUID_INDEX_MAX
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};
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extern struct cpu_features
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{
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enum
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{
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arch_kind_unknown = 0,
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arch_kind_intel,
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arch_kind_amd,
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arch_kind_other
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} kind;
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int max_cpuid;
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struct cpuid_registers
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{
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unsigned int eax;
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unsigned int ebx;
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unsigned int ecx;
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unsigned int edx;
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} cpuid[COMMON_CPUID_INDEX_MAX];
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unsigned int family;
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unsigned int model;
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} __cpu_features attribute_hidden;
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extern void __init_cpu_features (void) attribute_hidden;
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#define INIT_ARCH()\
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do \
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if (__cpu_features.kind == arch_kind_unknown) \
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__init_cpu_features (); \
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while (0)
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/* Used from outside libc.so to get access to the CPU features structure. */
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extern const struct cpu_features *__get_cpu_features (void)
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__attribute__ ((const));
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/* Following are the feature tests used throughout libc. */
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#ifndef NOT_IN_libc
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# define HAS_POPCOUNT \
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((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 23)) != 0)
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# define HAS_SSE4_2 \
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((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 20)) != 0)
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# define HAS_FMA \
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((__cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 12)) != 0)
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#else
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# define HAS_POPCOUNT \
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((__get_cpu_features ()->cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 23)) != 0)
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# define HAS_SSE4_2 \
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((__get_cpu_features ()->cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 20)) != 0)
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# define HAS_FMA \
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((__get_cpu_features ()->cpuid[COMMON_CPUID_INDEX_1].ecx & (1 << 12)) != 0)
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#endif
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